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    • 专利摘要:
    Beginning of the National Phase: 05/09/2013 (57) Summary: MAGNETIC COUPLING PUMP DRIVING UNIT AND MAGNETIC COUPLING PUMP UNIT A magnet coupling pump drive unit is provided, in which flow leakage magnetic to the outside and the effect of the external magnetic field are suppressed. It includes: a drive magnet (219) positioned on the outside of the driven magnet (19) of the magnetic coupling pump (100) with respect to a axis of rotation (A) of the magnetic coupling pump (100) to face the the driven magnet (19) with a space; a glass tube part (221) made of a ferromagnetic material and in a tubular shape centered on the axis of rotation (A); a main housing body (231) including a cup (220) to which the actuation magnet is fixed within the part of the cup tube; a motor (210) rotating the cup around the axis of rotation, and a tube part (232), which is in a tubular shape and the cup is provided in the tube part (323) with a space.
    公开号:BR112013011539B1
    申请号:R112013011539-4
    申请日:2012-09-13
    公开日:2021-03-02
    发明作者:Hideo Hoshi；Shogo Nakashima；Tatsuya Hidaka；Yasuharu Yamamoto (Falecido)；Takeshi Okubo；Toshiyuki Osada；Masashi Tagawa
    申请人:Nipro Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to a drive unit for a magnetic coupling pump in which an impeller provided with a permanent magnet, such as a driven magnet, is rotated by turning a permanent magnet which is a driving magnet. Also, the present invention relates to a magnetic coupling pump unit provided with the drive unit.
    [002] Priority is claimed in Japanese Patent Application No. 2011-201851, filed on September 15, 2011, the content of which is incorporated here by reference. BACKGROUND OF THE TECHNIQUE
    [003] As a magnetic coupling pump unit, for example, there is one described in PTL 1 shown below.
    [004] The pump of the magnetic coupling pump unit described in PTL 1 includes an impeller and a fixing body. A hydrodynamic pressure bearing part, which rotatively supports the impeller around the axis of rotation, is formed in the clamping body. A driven magnet made of a permanent magnet is supplied to the impeller. In addition, the drive unit rotating the pump impeller includes a rotating magnetic field generating device, which generates a rotating magnetic field around the axis of rotation magnetically coupled to the driven magnet of the pump. Citation List
    [005] Patent Literature: PTL 1 - Japanese Patent Application (granted) No. 4108054 SUMMARY OF THE INVENTION Technical problem
    [006] External or similar electronic devices may be adversely affected in the drive unit described in PTL1 by the leakage of magnetic flux to the outside, as the pump is driven by rotating the magnetic magnet to magnetically couple to the driven magnet provided in the side of the pump. Also, the stable rotation of the impeller can be disturbed by the imbalance of the magnetic coupling between the actuation magnets and actuated in the presence of an external magnetic body.
    [007] The inventors of the present invention have focused attention on the problems mentioned above. The purpose of the present invention is to provide a magnetic coupling pump drive unit suppressing the leakage of magnetic flux outward and the effect of the external magnetic field, and a magnetic coupling pump unit provided with the drive unit. Solution to the Problem
    [008] Drive unit of a magnetic coupling pump related to the present invention to solve the above problems is a drive unit of a magnetic coupling pump with an impeller that is rotatable about an axis of rotation, and a magnet actuated which is made of a permanent magnet and fixed to the impeller, the drive unit including: an assembly part to which the magnetic coupling pump is fixed; a drive magnet positioned on the outside of the driven magnet of the magnetic coupling pump with respect to an axis of rotation of the magnetic coupling pump fixed on the mounting part so as to face the driven magnet with a clearance; a magnet retaining ring, which is made of a ferromagnetic material and includes a tube part having a tubular shape centered on the axis of rotation of the magnetic coupling pump fixed on the mounting part, the drive magnet being fixed on an inner side the tube part; a motor rotating the magnet retaining ring around the axis of rotation of the magnetic coupling pump attached to the mounting part; and a magnetism shielding body including a tube part which is made of paramagnetic material and is in a tubular shape, the magnetic retaining ring being provided within an inner tube portion of the magnetism shielding body with a clearance.
    [009] The magnetic flux directed outwards and towards the circumferential direction between the magnetic flux formed by the driven and driven magnets, passes through the magnet retaining ring making the magnet retaining ring a part of the magnetic circuit, in the measure wherein the drive magnet is fixed inside the magnet retaining ring made of a ferromagnetic material in the drive unit. Because of this, the amount of leakage from the magnetic flux formed by the driven and drive magnets outside can be reduced to an extremely low level in the drive unit. Additionally, passing the magnetic flux through the magnetism shielding body from the inside to the outside can be suppressed, as the magnetism shielding body, which is made of a paramagnetic material, is supplied outside the ring retaining ring. magnet with the middle space.
    [010] Therefore, the leakage of magnetic flux to the outside of the magnetism shield body can be suppressed to the minimum level in the drive unit.
    [011] Also, passing through the magnetic flux from the external magnetic body into the magnetism shielding body made of the paramagnetic material can be suppressed even in the presence of the magnetic body outside the magnetism shielding body in the drive unit. In addition, the leakage of magnetic flux from the outside to the inside of the magnetic retaining ring can be suppressed, provided that the magnet retaining ring made of the ferromagnetic material is supplied within the magnetism shield body in the drive unit.
    [012] As explained above, the first measurement of magnetic shielding, in which the leakage of the magnetic flux from a part is suppressed by actively allowing the magnetic flux to pass through the part (the magnet retaining ring made of the ferromagnetic material), and the second measurement of magnetic shielding, in which the passage of the leaked magnetic flux through the parts (the magnetism shielding body made of paramagnetic material) is suppressed, are combined in the drive unit. Therefore, the leakage of the magnetic flux outward, and the effect of the external magnetic field can be effectively suppressed. Specifically, the leakage of the magnetic flux (the magnet retaining ring made of ferromagnetic material) out is suppressed by the first shield measurement, and then the passage through the magnetic flux out is further suppressed by the second shield measurement in the unit. drive. Therefore, the leakage of the magnetic flux outward can be suppressed very efficiently.
    [013] The drive unit for a magnetic coupling pump described above may further include a drive unit housing housing the magnet retaining ring and the motor, where the drive unit housing comprises the mounting part and the magnetism shielding body.
    [014] The leakage of the magnetic flux out of the drive unit enclosure and the effect of the magnetic field outside the drive unit enclosure can be suppressed in the drive unit.
    [015] In the drive unit of a magnetic coupling pump described above, the drive magnet is made of a neodymium magnet.
    [016] The drive magnet can be small in size and light in that the neodymium magnet with an extremely strong magnetic force is used in the drive unit. Therefore, the drive unit can be reduced in size and light, and the inertial force of the rotating body can be reduced.
    [017] In the drive unit of a magnetic coupling pump described above, a convex shaped cooling fin can be formed on an outer circumferential surface of the tube part of the magnetism shield body along the outside of the tube part.
    [018] The temperature increase of the magnetism shield body and the interior of the magnetism shield cup can be supplied in the aforementioned drive unit. Therefore, the reduction of the magnetic force due to the increase in temperature can be suppressed, for example, in a case where the neodymium magnet, which has a relatively high magnet strength, but its magnetic force is substantially reduced due to the increase in temperature, it is used as the actuation magnet.
    [019] In the drive unit of a magnetic coupling pump described above, the tube portion of the magnetism shield body can be made of a paramagnetic aluminum alloy.
    [020] The drive unit can be light in that at least the tube portion of the magnetism shield body is made of aluminum alloy with a relatively low density in the drive unit. In addition, the radiation effect can be improved as at least the tube part of the magnetism shield body is made of aluminum alloy with a relatively high thermal conductivity.
    [021] A magnetic coupling pump unit related to the present invention to solve the above problems is a magnetic coupling pump unit including: a drive unit for a magnetic coupling pump mentioned above; and the magnetic coupling pump, wherein the magnetic coupling pump includes a pump casing that houses the impeller allowing the impeller to be rotated in the pump casing, and the actuation magnet is provided on the outside of the pump casing centered on a rotation axis of the magnetic coupling pump fixed to the mounting part with a space.
    [022] Another magnetic coupling pump unit related to the present invention to solve the above problems is a magnetic coupling pump unit including: an impeller, which is rotatable about an axis of rotation; a driven magnet, which is made of a permanent magnet and attached to the impeller; a drive magnet made of a permanent magnet and positioned outside the driven magnet with respect to the axis of rotation with a space; a magnet retaining ring, which is made of a ferromagnetic material and includes a tube part having a tubular shape centered on the axis of rotation, the drive magnet being fixed to an interior of the tube part; a motor rotating the magnet retaining ring around the axis of rotation; and a magnetism shielding body including a tube part, which is made of a paramagnetic material and is in a tubular shape centered on the axis of rotation, the magnet retaining ring being provided inside the tube part of the body of shielding magnetism with a space.
    [023] The leakage of the magnetic flux outward and the effect of the external magnetic field can also be suppressed in these magnetic coupling pump units, as they have the magnet retaining ring and the magnetism shield body as the drive unit described above.
    [024] In the magnetic coupling pump units described above, the impeller can include a tube part, an outer circumferential surface of which is in a tubular shape centered on the axis of rotation, and the pump casing can include a forming part of hydrodynamic bearing, which houses the tube part of the impeller and supports the tube part rotatingly without contacting the tube part, an internal circumferential surface of the hydrodynamic bearing forming part being in a tubular shape.
    [025] The impeller can be rotatably supported without contacting the pump casing on the magnetic coupling pump units described above. Advantageous Effects of the Invention
    [026] The leakage of the magnetic flux outward and the effect of the external magnetic field can be suppressed in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
    [027] Figure 1 is a plan view of a magnetic coupling pump unit in an embodiment related to the invention.
    [028] Figure 2 is a view as seen from arrow II in Figure 1.
    [029] Figure 3 is a cross-sectional view taken along line III-III in Figure 1.
    [030] Figure 4 is a cross-sectional view of a magnetic coupling pump in the modality related to the invention.
    [031] Figure 5 is a schematic view schematically representing the cross section of the substantial part of the magnetic coupling pump unit in the embodiment related to the invention.
    [032] Figure 6 is a schematic view schematically representing the cross section of the substantial part of the magnetic coupling pump unit in the embodiment related to the invention.
    [033] Figure 7 is a schematic view representing the cross section of the substantial part of the magnetic coupling pump unit from a comparative example. DESCRIPTION OF THE MODALITIES
    [034] Hereinafter, an embodiment of a magnetic coupling pump unit related to the present invention will be described in detail with reference to the drawings.
    [035] The magnetic coupling pump unit 1 of the present embodiment includes the magnetic coupling pump 100 and the drive unit 200 that drives the magnetic coupling pump 100 as shown in Figures 1 to 3.
    [036] The magnetic coupling pump 100 includes the closed impeller 10 and the pump housing 60 which houses the impeller 10 in such a way that the impeller is rotatable about an axis of rotation A as shown in Figure 4.
    [037] The pump casing 60 is formed with a discharge port 7 (referring to Figures 1 and 2) to discharge a liquid, and a suction port 6 to suck a liquid on an extension line of the rotation axis A In addition, then, in a direction of axis Da in which the axis of rotation A extends, one side of the suction port 6 of the pump housing 60 is defined as a front side and a side opposite the front side, is defined as a rear side. Additionally, in a radial direction Dr which is a direction perpendicular to the axis of rotation A, one side approaching the axis of rotation a is defined as an inner side and a side moving away from the axis of rotation A is defined as a side external.
    [038] The impeller 10 has several blades 11 provided around the axis of rotation a, a front guard 20 that covers the front side of the various blades 11, and a rear guard 40 that covers the rear side of the various blades 11. As described above, impeller 10 forms a closed impeller when the front and rear of the various blades 11 are covered with the front guard 20 and the rear guard 40. The various blades 11, the front guard 20, and the rear guard 40 are joined together.
    [039] The front guard 20 forms a cylindrical shape around the axis of rotation A, and has a part of the inlet tube 21 that forms an impeller inlet 12 in which a front opening in the direction of the axis Da faces the orifice suction cup 6 of the pump casing 60, and a front plate part 31 which is provided at a rear end in the inlet tube part 21 and covers the front side of the various blades 11. Additionally, the rear guard 40 has a part of rear plate 41 covering the rear side of the various blades 11, and an axle part 51 which is provided at a rear end of the rear plate part 41 and is columnar around the axis of rotation A.
    [040] Both formats of the faceplate part 31 of the front guard 20 and the rear face part 41 of the rear guard 40 as seen from the direction of axis Da are circular around the axis of rotation A. The plate part front 31 and the rear plate part 41 are spaced apart in the direction of axis Da, and several blades 11 are fixed between the front plate part 31 and the rear plate part 41. An outer edge in the radial direction Dr between the the faceplate part 31 and the rear faceplate part 41 forms an impeller outlet 13. A flow channel within the impeller Pr is formed between the various blades 11 between the faceplate portion 31 and the faceplate portion 41 within the inner tube part 21.
    [041] The shaft part 51 of the rear guard 40 is formed with a straight hole 56 that passes through a axis of rotation A in the direction of the axis Da and allows the flow channel inside the impeller Pr to communicate between an end face rear 53 of the axle part 51 and pump casings 60. A 19y driven yoke, which is formed of a ferromagnetic material and in a tubular shape, and several driven magnets 19 formed of permanent magnets are embedded in a position between an outer peripheral surface 52 of the shaft part and an internal peripheral surface of the direct bore 56 in the shaft part 51. The driven magnets 19 are provided in the outer circumference of the driven yoke 19y in tubular shape.
    [042] The pump casing 60 has a front pump casing 61 that covers the front guard 20 of the impeller 10, and a rear pump casing 81 that covers the rear guard 40 of the impeller 10.
    [043] The front casing of the pump 61 has a substantially cylindrical suction hose connection tube part 62 to which a suction hose is connected, a tube part of increased diameter 65 from which the inner diameter is gradually increased by one rear end of the suction hose connection tube part 62 to the rear side, a front bearing forming part 67 which is provided at a rear end of the increased diameter tube part 65 and is formed with an inner peripheral surface 68 which faces the outer peripheral surface 22 of the inlet tube part 21 of the front guard 20 at a distance thereof, and a front housing body part 71 which is provided at a rear end of the front bearing forming part 67 and covers the faceplate part 31 of the front guard 20.
    [044] The front end of the suction hose connection tube part 62 opens, and this opening forms the suction hole 6 of the pump housing 60.
    [045] The front housing body part 71 has a flat face ring-shaped front face 72 that extends from a rear end of the front bearing forming part 67 to the rear end, and faces the front face 32 of the front plate part 31 of the front guard 20 at a distance thereto in the direction of the axis Da, and a part of the front body tube 75 which forms a substantially cylindrical shape around the axis of rotation A and extends from the outer peripheral edge of the part facing the front face 72 to the rear side. The cross-sectional shape of the inner peripheral surface 76 of the front body tube part 75 perpendicular to the axis of rotation A forms a volute shape. The inner peripheral surface 76 of the front body tube part 75 faces towards the outer peripheral edge of the faceplate part 31 of the front guard 20 at a distance thereof.
    [046] The rear casing of the pump 81 has a rear casing body part 91 which is provided at a rear end of the front casing body part 71 and covers the rear plate part 41 of the rear guard 40, a forming part rear bearing 82 which is formed with an inner peripheral surface 83 which is provided in a rear shell body part 91 and faces the outer peripheral surface 52 of the axle part 51 of the rear guard 40 at a distance thereof, and a circular flat plate back plate part 85 which is provided at a rear end of the rear bearing forming part 82 and faces towards the shaft part 51 of the rear guard 40 at a distance thereof in the direction of axis Da .
    [047] The rear housing body part 91 has a rear housing tube part 92 that forms a substantially cylindrical shape around the axis of rotation A and extends from a rear end of the front housing body part 71 to the rear side, and a flat face ring-shaped rear face 95 that extends from a front end of the body tube part 92 to the inside and faces the rear face 42 of the back plate part 41 of the rear guard 40 at a distance from the same in the direction of the axis Da. An inner edge of the part facing the rear face 95 is provided with a rear bearing forming part 82 that extends backwards from its inner edge.
    [048] Pump housing 60, as shown in Figures 1 and 2, has a substantially cylindrical discharge hose connection tube portion 9 to which a discharge hose is connected. An Ad axis of the substantially cylindrical discharge hose connection tube part 9 is parallel to a face perpendicular to the axis of rotation. In addition, the discharge hose connection tube part 9 is divided into two in a front-to-back direction in a plane passing through the Ad axis. A discharge hose connection tube hose part is provided in the front body tube 75 of the pump front casing 61 as a split front part of connecting tube 78, and the other hose part of the discharge hose connecting tube is provided in the rear body tube part 92 of the rear casing of pump 81 as a rear split portion of connection pipe 98. An outer end of the discharge hose connection pipe part 9 opens, and this opening forms the discharge orifice 7 of pump housing 60.
    [049] The front pump casing 61 and the rear pump casing 81 are integrally molded products made of resin, respectively. The front pump casing 61 and the rear pump casing 81 are joined with an adhesive.
    [050] Pump drive unit 200, as shown in Figures 3 and 5, is equipped with a motor 210 having a rotating output shaft 21, a cup (the magnet retaining ring) 220 that forms a cylindrical shape of bottom, several drive magnets 219 that are attached to the inner peripheral side of cup 220, a drive unit housing 230 covering motor 210 and cup 220, and a locking element 250 to hold the magnetic coupling pump assembly 100 mounted on the drive unit housing 230.
    [051] Cup 220 is formed, for example, from carbon steel. Like SS400, which is a ferromagnetic material, and serves as a breech for the various drive magnets 219. Cup 220 has a cylindrical cup cylinder part 221, and a flat plate circular motor connection 225 that blocks an opening in the cylinder portion of cup 221. The output shaft 211 of motor 210 is attached to an extension line of the shaft of the cylinder portion of cup 221 at the connection of motor 225. As mentioned above, the various drive magnets 219 are attached to the inner peripheral side of the cup cylinder part 221. The drive magnets 219 are permanent magnets, for example, Nd (neodymium) magnets.
    [052] The inner diameter of the cup cylinder part 221 is greater than the outer diameter of the rear bearing forming part 82 of the rear pump housing 81. Additionally, a length (hereinafter referred to as the magnet assembly diameter ) twice the radial length of the shaft from the cylinder part of the cup 221 to the inner surface of each drive magnet 219 is greater than the outside diameter of the rear bearing forming part 82 of the rear pump housing 81.
    [053] The drive unit housing 230 has a cylindrical bottom housing (the magnetism shield body) 231, and a cover 241 that blocks an opening in the housing body 231.
    [054] The housing body 231 is formed, for example, from an Al (aluminum) alloy which is a paramagnetic material. The casing body 231 has a cylindrical casing part 232 which has an inner diameter greater than the outer diameter of the cup 220 and the outer diameter of the motor 210, and a flat plate circular casing bottom part 235 which blocks a opening of the cylinder part of housing 232.
    [055] Motor 210 is placed in housing body 231, and is fixed to the bottom part of housing 235 with screws or the like. A portion of an outer periphery of the housing cylinder part 232 forms a concave-convex shape in the radial direction Dr, and the convex parts form radiation fins 233. Additionally, a power cable plate 234 to allow a power cable the motor 210 passes through it is built in another part of the cylinder parts of the housing 232.
    [056] The lid 241 is formed, for example, from resin, such as engineering plastic. The cap 241 has a pump fitting part 242 that forms a cylindrical bottom shape and in which the rear bearing forming part 82 and the rear wall plate part 85 of the rear pump housing 81 fit a receiving part of pump 244 which extends from an opening edge of the bottom cylindrical pump fitting part 242 to the outside and forms a flat plate ring shape, and an engagement part 246 which is formed at an outer peripheral edge of the pump inlet 244 and engages an opening edge of the housing body 231. the cover 241 forms the mounting part, to which the magnetic coupling pump 100 is attached.
    [057] The inside diameter of the bottom cylindrical pump fitting part 242 is substantially the same as the outside diameter of the rear bearing forming part 82 of the pump housing 60. Therefore, the rear bearing forming part 82 of the pump housing 60 can be fitted to the pump fitting part 242 of the cover 241. Additionally, the pump fitting part 242 has an outer diameter smaller than the inner diameter of the cup cylinder part 221 and the aforementioned magnet assembly diameter, and enters the cup with a cylindrical bottom 220 in a state of non-contact with the drive magnets 219 fixed in the cup 220.
    [058] In the following, the operation of the magnetic coupling pump unit described above and the action of the magnetic coupling pump unit described above based on the operation will be described.
    [059] When the magnetic coupling pump unit 10 is activated, first, the suction hose is connected to the suction hose connection tube part 62 of the magnetic coupling pump 100, and the discharge hose is connected to the part discharge hose connection tube 9 by the operator.
    [060] Next, the rear bearing forming part 82 of the pump housing 60 is fitted to the pump housing part 242 of the cover 241 of the drive unit housing 230, and the magnetic coupling pump 100 is attached to the unit pump drive 200. In this case, the rear facing part 95 of the pump casing 60 and the pump receiving part 244 of the cap 241 come into contact with each other. Next, the pump housing 60 is attached to the drive housing unit 230 by the locking element 250.
    [061] In the magnetic coupling pump unit, in this state, the driven magnets 19 embedded in the shaft part 51 of the magnetic coupling pump 100 and the drive magnets 219 fixed in the cup 220 of the pump drive unit 200 turn one to the other in the radial direction Dr, and both magnets are magnetically coupled to each other. Additionally, the output shaft 211 of the motor 210 is located on the extension line of the rotation axis A of the dynamic pressure bearing pump 100.
    [062] In addition to the above, the magnetic coupling pump 100 is attached to the drive unit 200 after the connection of the suction hose and the discharge hose, the connection of the suction hose and the discharge hose can be carried out after the fixing the magnetic coupling pump 100.
    [063] The electric power is then supplied to the motor 210 of the drive unit 200 in order to rotate the output shaft 211 of the motor 210 and rotate the cup 220 fixed on the output shaft 211 and the various drive magnets 219 fixed. in cup 220. if the drive magnets 219 of the drive unit 200 rotate, the driven magnets 19 of the magnetic coupling pump 100 which are magnetically coupled to the drive magnets 219 also rotate around the axis of rotation A with the rotation of the magnets drive magnets 219. the driven magnets 19 of the magnetic coupling pump 100 are embedded in the shaft part 51 of the impeller 10. For this reason, if the drive magnets 219 of the drive unit 200 rotate, the impeller 10 rotates about the axis of rotation A, inside the pump housing 60 together with the driven magnets 19.
    [064] As described above, in the present embodiment, the shaft part 51 of the impeller 10 is arranged within the various drive magnets 219 and the driven magnets 19 are embedded within the shaft part 51. Thus, the outside diameter of the shaft part axis 51 of impeller 10 may be smaller than that in a case where the magnetic magnets are arranged outside the drive magnets. Therefore, according to the present embodiment, it is possible to reduce the size and weight of the impeller 10, and a force of inertia with respect to the rotation of the impeller 10 may be small.
    [065] If the impeller 10 starts to rotate inside the pump casing 60, as shown in Figure 5, a liquid is sucked into the pump casing 60 from the suction port 6 of the pump casing 60. the liquid sucked into the pump casing 60 it enters the flow channel inside the impeller Pr inside the impeller 10 from the impeller inlet 12.
    [066] After the liquid, which has entered the flow channel inside the impeller Pr, receives a centrifugal force from the various rotating blades 11 and flows out of the impeller outlet 13, the liquid in discharged from the discharge hole 7 of the housing of pump 60.
    [067] A portion of the liquid that flowed out of the impeller outlet 13, returns to the increased diameter tube portion 65 of the pump front casing 61 between the inner peripheral surface 68 of the front bearing forming part 67 of the front casing of pump 61 and the outer peripheral surfaces 22 of the inlet pipe portion 21 of the front guard 20, between the inner surface 73 of the portion facing the front face 72 of the pump front housing 61 and the front face 32 of the front plate portion 31 of the front guard 20. Then, the liquid enters the flow channel inside the impeller Pr again from the impeller inlet 12.
    [068] Additionally, the other part of the liquid that flowed out of the impeller outlet 13, as shown in Figures 6 and 8, returns to the flow channel inside the impeller Pr in having the inner peripheral surface 83 of the forming part rear bearing 82 of the rear pump housing 81 and the outer peripheral surface 52 of the shaft portion 51 of the rear guard 40, between the inner surface 86 of the rear wall plate part 85 of the rear pump housing 81 and the rear end face 53 of the shaft part 51 of the rear guard 40, and through the direct hole 56 of the rear guard 40, between the inner surface 96 of the part facing the rear face 95 of the pump back housing 81 and the rear face 42 of the plate part rear guard 51 of rear guard 40.
    [069] A generatrix of the inner peripheral surface 68 of the front sleeve forming part 67 of the pump front casing 61 and the generatrix of the outer peripheral surface 22 of the inlet tube part 21 of the front guard 20 are parallel to each other . In other words, the distance between the inner peripheral surface 68 of the front bearing forming part 67 and the outer peripheral surface 22 of the inlet pipe part 21 is constant in the direction of the Da axis. In addition, both cross-section shapes of the inner peripheral surface 68 of the front bearing forming part 67 of the front pump housing 61 and the peripheral surface 22 of the inlet tube part 21 of the front guard 20 perpendicular to the axis of rotation A, are circles. For this reason, the inner peripheral surface 68 of the front bearing forming part 67 and the outer peripheral surface 22 of the inlet tube part 21 form dynamic pressure radial bearing faces, respectively, and the liquid flowing between both faces. 68 and 22 works as a lubricating fluid. Therefore, as for impeller 10, the inlet tube portion 21 of impeller 10 is rotatably supported in a non-contact state in the radial direction Dr by pump housing 60. In addition, when the rotational frequency of impeller 10 is low, such as the start of rotation of the impeller 10, a part of the inner peripheral surface 68 of the front bearing forming part 67 and a part of the outer peripheral surface 22 of the inlet tube part 21 come into contact with each other. If the rotational frequency of the impeller 10 becomes equal to or more than a predetermined rotational frequency, the inlet tube part 21 floats with respect to the inner peripheral surface 68 due to the dynamic pressure of a fluid working between both faces 68 and 22, and as mentioned above, the inlet tube portion 21 of the impeller 10 is rotatably supported in a non-contact state by the inner peripheral surface 68.
    [070] Additionally, a generatrix of the inner peripheral surface 83 of the rear bearing forming part 82 of the rear pump casing 81 and a generatrix of the outer peripheral surface 52 of the axle part 51 of the rear guard 40 are parallel to each other. In other words, the distance between the inner peripheral surface 83 of the rear bearing forming part 82 and the outer peripheral surface 52 of the shaft part 51 is constant in the direction of axis Da. Additionally, both shapes of the cross section of the peripheral surface inner 83 of the rear bearing forming part 82 of the rear pump casing 81 and the outer peripheral surface 52 of the rear protection shaft part 40 perpendicular to the axis of rotation A are circles. For this reason, the inner peripheral surface 83 of the rear bearing forming part 82 and the outer peripheral surface 52 of the shaft part 51 form dynamic pressure radial bearing faces, respectively, and the liquid flowing between the inner peripheral surface 83. and the outer peripheral surface 52 functions as a lubricating fluid. Therefore, as for impeller 10, the shaft portion 51 of impeller 10 is rotatably supported in a non-contact state in the radial direction Dr by pump housing 60. In addition, as for shaft portion 51 of impeller 10 , similarly to the inlet tube part 21, a part of the inner peripheral surface 83 of the rear bearing forming part 82 and a part of the outer peripheral surface 52 of the shaft part 51 come into contact with each other when the rotational frequency of the impeller 10 is low. If the rotational frequency of the impeller 10 becomes equal to or more than a predetermined rotational frequency, the shaft part 51 fluctuates with respect to the inner peripheral surface 83 due to the dynamic pressure of the fluid working between both faces 83 and 52, and the shaft part 51 of impeller 10 is rotatably supported in non-contact by the inner peripheral surface 83.
    [071] As described above, in the present embodiment, two locations of the inlet tube part 21 and the shaft part 51 of the impeller 10 are rotatably supported in a non-contact state in the radial direction Dr by the inner peripheral surfaces 68, 83, in other words, impeller 10 is rotatably supported at both ends in a non-contact state in the radial direction Dr. In addition, impeller 10 is supported in two locations on the front side and the rear side based on position center of gravity. Therefore, according to the present invention, even if the moment around an axis perpendicular to the axis of rotation A is generated, the impeller 10 can be supported in a stable manner.
    [072] Additionally, in the present embodiment, the outer diameter of the shaft part 51 of the impeller 10 can be made small as mentioned above. Therefore, the circumferential speed of the shaft part 51 can be suppressed. Therefore, according to the present embodiment, a shear deformation that acts on a liquid flowing between the outer peripheral surface 52 of the shaft part 51 and the inner peripheral surface 83 of the rear bearing forming part 82 of the rear pump casing 81 can be made small. Thus, for example, in a case where jelly-type or similar grains are included in this liquid, damage to jelly-type or similar grains can be suppressed.
    [073] In the present embodiment, the position of the impeller 10 in the direction of axis Da with respect to the pump housing 60 is maintained by the magnetic coupling force between the driven magnets 19 inside the impeller 10 and the driving magnets 219 of the drive unit 200. The position of the impeller 10 in the direction of axis Da, which is maintained by the magnetic coupling force, is a position where the surface of the impeller 10 and the face of the pump housing 60 which face each other in the direction of the axis Da do not come in contact with each other. That is, in the present embodiment, the impeller 10 is rotatably supported in a non-contact state also in the direction of the Da axis.
    [074] The impeller 10 is rotated with the driven magnet 19 rotating the driving magnet 219, which is magnetically coupled with the driven magnet 19 embedded in the impeller 10, in the present mode as explained above. Therefore, it is possible that the magnetic flux of the driven and drive magnets is leaked out and adversely affects external electronic devices or the like. Also, the stable rotation of the impeller can be disturbed by the imbalance of the magnetic coupling between the drive magnets and actuated in the presence of a magnetic body on the outside.
    [075] Thus, the main housing body (the magnetism shield body) 231, which is tubular in shape with a bottom plate and made of a paramagnetic aluminum alloy centered on the axis of rotation A is supplied in the present mode as shown in Figure 6. Also, the cup (the magnet retaining ring) 220, which is in a tubular shape with a bottom plate and made of ferromagnetic carbon steel such as SS400 or similar, is provided within the main housing body with a space as a breech. Also, multiple actuating magnets 219 are attached to the inner circumference side of the cup (the magnet retaining ring) 220. Also, multiple actuating magnets 19 are provided on the inner circumference side (the rotation axis side A) of the magnets drive 219 with a space.
    [076] If the main housing body (the magnetism shield body) 231 and the cup (the magnet retaining ring) 220 were not provided in the present embodiment as shown in Figure 7, a part of the fluxos magnetic flux formed by the actuated magnet 19 and actuating magnet 219 would move through the location of the long shoulder.
    [077] However, the magnetic flux Φs directed outward and in the circumferential direction between the magnetic flux formed by the driven magnet 19 and the driving magnet 219 passes through the interior of the cup 220 making the cup (the retaining ring magnet) 220 formed of a ferromagnetic material to be a part of the magnetic circuit, as the drive magnet 219 is fixed inside the cup (the magnet retaining ring) 220 made of a ferromagnetic material in the present embodiment.
    [078] Because of this, the amount of leakage from the magnetic flux formed by the driven magnet 19 and the driving magnet 219 outward can be reduced to an extremely low level in the present mode. In addition, by passing the magnetic flux through the main housing body 231 from the inside out it can be suppressed, provided that the main housing body (the magnetism shield body) 231, which is made of a paramagnetic material, is provided outside of cup 220 with the interspace (air space).
    [079] Therefore, the leakage of the magnetic flux to the outside of the drive unit housing 230 can be suppressed to the minimum level in the present mode.
    [080] Also, the passage of the magnetic flux from the magnetic body into the housing body (the magnetism shield body) 231 made of a paramagnetic material can be suppressed even in the presence of a magnetic body external to the housing of the drive unit 230 in the present mode. Furthermore, the leakage of the magnetic flux from the outside into the body 220 in the present embodiment, insofar as the cup (the magnet retaining ring) 220 made of a ferromagnetic material is provided inside the main housing body ( magnetism shield body) 231.
    [081] Therefore, the effect of the magnetic flux formed by the driven magnet 19 and the driving magnet 29 can be suppressed to the minimum level in the present mode even in the presence of a magnetic body external to the drive unit housing 230.
    [082] As explained above, the first magnetic shielding measure, in which the leakage of the magnetic flux from one part is suppressed allowing the magnetic flux to pass through the part (the cup 220 made of ferromagnetic material) and the second measure of magnetic shielding, in which the passage of the leaked magnetic flux through the parts (the main housing body 231 made of paramagnetic material) is suppressed, are combined in the drive unit. Therefore, the leakage of the magnetic flux outward and the effect of the external magnetic field can be effectively suppressed. Specifically, the leakage of the magnetic flux from the part (the cup 220 made of ferromagnetic material) outwards is suppressed by the first shielding measure, and then the passage of the magnetic flux to the outside is further suppressed by the second shielding measure in the drive unit. . Therefore, the leakage of the magnetic flux outward can be efficiently suppressed.
    [083] Additionally, in the present mode, the neodymium magnet is used as the drive magnet 219 as explained above. the neodymium magnet has an extremely strong magnetic force. However, the magnetic force can be varied dramatically in response to a temperature deviation. For example, the Sm - Co magnet (samarium - cobalt), which has a strong magnetic force close to the neodymium magnet, has a temperature coefficient of -0.03. The temperature coefficient represents the degree of variation of the magnetic force in relation to the temperature deviation. Contrary to this, the neodymium magnet has a greater magnetic force than the Sm - Co magnet, but its magnetic force is reduced to a greater degree in response to the increase in temperature.
    [084] Therefore, the temperature increase of the drive magnet 219 is suppressed by turning the drive magnet 219 made of the neodymium magnet with the cup 220 to cool the drive magnet 219, and forming the heat radiating fin 233 for the main housing body 231 covering the outer circumference of the drive magnet 219 to suppress the temperature rise in the main housing body 21 in the present embodiment.
    [085] The hydrodynamic pressure bearing pump is shown in the above mentioned modalities as an example of a pump. However, the present invention is not particularly limited to the configuration using the hydrodynamic pressure bearing. Any pump can be used in the present invention in that it is a pump in which the impeller is rotated using magnetic coupling.
    [086] The magnetic coupling pump 100 is detachable from the drive unit 200 in the above mentioned modes. However, it is not essential for the magnetic coupling pump to be detachable from the drive unit 200, and they can be formed integrally. In this case, the mounting part can be omitted. INDUSTRIAL APPLICABILITY
    [087] In the magnetic coupling pump unit, the leakage of magnetic flux and the influence of the external magnetic field can be suppressed. Reference Signal List 1 - magnetic coupling pump unit 6 - suction port 7 - discharge port 9 - discharge hose connection tube part 10 - impeller 11 - blade 12 - impeller inlet 13 - impeller outlet 19 - driven magnet 20 - front protection 21 - part of the inlet tube 22 - outer peripheral surface (of the part of the inlet tube) 31 - part of the front plate 32 - front face 40 - rear protection 41 - part of the back plate 42 - rear face 51 - shaft part 52 - outer peripheral surface (of shaft part) 53 - rear end face (of shaft part) 56 - direct bore 60 - pump housing 61 - front pump housing 62 - pipe part suction hose connection 65 - increased diameter tube part 67 - front bearing forming part 68 - inner peripheral surface (of the front bearing forming part) 71 - front housing body part 72 - face-facing part against ira 73 - inner surface (from the front facing part) 75 - front body tube part 81 - rear pump casing 82 - rear bearing forming part 83 - inner peripheral surface (from the rear bearing forming part) 85 - rear wall plate part 91 - rear housing body part 92 - rear body tube part 95 - rear side part 96 - inner surface (from rear side part) 100 - coupling pump magnetic 200 - drive unit 211 - output shaft 219 - drive magnet 220 - cup (magnet retaining ring) 230 - drive unit housing 231 - main housing body (magnetism shield body) 241 - cover ( mounting part)
    权利要求:
    Claims (6)
    [0001]
    1. Drive unit (200) for a magnetic coupling pump (100) with an impeller (10), which is rotatable about an axis of rotation (A), and a driven magnet (19), which is made of a permanent magnet fixed to the impeller (10), the drive unit (200) FEATURED by the fact that it comprises: a magnetism shielding body (231) being made of a paramagnetic material and having a cylindrical bottom shape; a mounting part (241) to which the magnetic coupling pump (100) is to be attached, to which the mounting part (241) is formed of resin, includes an engaging part (246) which is formed at an edge outer periphery thereof and engages an opening edge of the magnetism shield body (231), and blocks an opening of the magnetism shield body (231); a drive magnet (219) positioned on the outside of the driven magnet (19) of the magnetic coupling pump (100) with respect to the axis of rotation (A) of the magnetic coupling pump (100) when it is fixed on the part of assembly (241) in order to face the driven magnet (19) with a clearance; a magnet retaining ring (220), which is made of a ferromagnetic material and includes a tube part having a tubular shape centered on the axis of rotation (A) of the magnetic coupling pump (100) to be fixed on the mounting part (241), in which the magnet retaining ring (220) is provided in an interior of the magnetism shield body (231) with a gap and the actuation magnet (219) is fixed in an interior of the tube part; a motor (210) rotating the magnet retaining ring (220) around the axis of rotation (A) of the magnetic coupling pump (100) to be fixed on the mounting part (241); and a plurality of convex shaped cooling fins (233) formed on an outer circumferential surface of the magnetism shield body (231).
    [0002]
    2. Drive unit (200) for a magnetic coupling pump (100), according to claim 1, CHARACTERIZED by the fact that it also comprises a drive unit housing (230) housing the magnet retaining ring (220 ) and the motor (210), wherein the drive unit housing (230) comprises the mounting part (241) and the magnetism shield body (231).
    [0003]
    3. Drive unit (200) for a magnetic coupling pump (100), according to claim 1 or 2, characterized in that the drive magnet (219) is made of a neodymium magnet.
    [0004]
    Drive unit (200) for a magnetic coupling pump (100) according to any one of claims 1 to 3, CHARACTERIZED that a tube part of the magnetism shield body (231) is made of an alloy of paramagnetic aluminum.
    [0005]
    5. Magnetic coupling pump unit (1), CHARACTERIZED by the fact that it comprises: a drive unit (200) for a magnetic coupling pump (100), as defined in any one of claims 1 to 4; and a magnetic coupling pump (100), wherein the magnetic coupling pump comprises: an impeller (10), which is rotatable about an axis of rotation (A); a driven magnet (19), which is made of a permanent magnet and fixed to the impeller (10); and a pump housing (60) which houses the impeller (10) allowing the impeller (10) to be rotated in the pump housing (60), and where the drive magnet (219) of the drive unit (200) is supplied on the outside of the pump housing (60) centered on a rotating axis of the magnetic coupling pump (100) fixed to the mounting part (241) with a space.
    [0006]
    6. Magnetic coupling pump unit (1), according to claim 5, CHARACTERIZED by the fact that: the impeller (10) comprises a tube part, an outer circumferential surface of which it is in a tubular shape centered on the shaft of rotation (A), and the pump housing (60) comprising a hydrodynamic bearing forming part, which houses the tube part of the impeller (10) and supports the tube part rotatingly without contacting the tube part, a surface internal circumferential part of the hydrodynamic bearing forming part being in a tubular shape.
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    同族专利:
    公开号 | 公开日
    CN103180616B|2014-11-19|
    US20140023535A1|2014-01-23|
    BR112013011539A2|2016-08-09|
    EP2752580A1|2014-07-09|
    JP2013066258A|2013-04-11|
    EP2752580A4|2015-02-25|
    US9188127B2|2015-11-17|
    JP4969695B1|2012-07-04|
    WO2013039148A1|2013-03-21|
    CN103180616A|2013-06-26|
    EP2752580B1|2016-05-04|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-04-09| B25A| Requested transfer of rights approved|Owner name: NIPRO CORPORATION (JP) |
    2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2021-01-26| B09A| Decision: intention to grant|
    2021-03-02| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/09/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011201851A|JP4969695B1|2011-09-15|2011-09-15|Drive device for magnetic coupling pump and magnetic coupling pump unit|
    JP2011-201851|2011-09-15|
    PCT/JP2012/073468|WO2013039148A1|2011-09-15|2012-09-13|Drive device for magnetic coupling pump, and magnetic coupling pump unit|
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