• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Lifting gripper (1) for a valve element (30) of a compressor valve (40), comprising at least one gripper finger (2) and a carrier bushing (14), wherein the gripper finger (2) is made of a first material, the carrier bush (14 ) is made by a casting process from a second material and the gripper finger (2) is at least partially encapsulated by the material of the support sleeve (14).
    公开号:AT514580A4
    申请号:T50773/2013
    申请日:2013-11-21
    公开日:2015-02-15
    发明作者:Bernhard Dr Spiegl；Markus Testori；Andreas Ing Schloffer
    申请人:Hoerbiger Kompressortech Hold；
    IPC主号:
    专利说明:

    Lifting gripper for a valve element of a compressor valve
    The invention relates to a Abhebegreifer for a valve element of a compressor valve, be¬ standing of a number of gripper fingers and a guide bush, and a method for producing a selbde Abhebergreifers.
    Lifting grippers are known in a variety of designs and are used to control plate and ring valves for compressors and the like. Abhebegreiferwerden basically used to prevent the closing of the corresponding valve and thus to allow the backflow of the medium to be compressed from the compressor chamber, usually in the suction chamber. By keeping it permanently open, the discharge of the compressor can be stopped or the idling of the compressor can be realized. Furthermore, the lift-off of valve elements is often used to start the compressor with minimal load, or to realize a stepless control of the compressor.
    Due to the high load and the high dynamics, most grippers are made from solid. By turning, milling and sawing operations, more than 80% of the starting material is machined. The solid-made grippers are sturdy and highly resistant to vibration, but due to the high material and manufacturing costs, they are very expensive.
    As a cost-effective variant, for example, DE15 03 426 A1 shows a Abhebegreifer, which consists of a metallic bush, concentric gripper rings, star-shaped angeord¬neten ribs and, with a valve plate interaction, gripper fingers. The socket is manufactured in a conventional manner by turning or casting. The concentric gripper rings carry the metallic gripper fingers cooperating with the valve plate and are connected to one another by the star-shaped ribs and to the socket. The cohesion of the individual components is ensured by Schweißverbin¬dungen. In order to ensure accessibility during the joining process, only a small number of star-shaped ribs are made continuously, from outermost gripper rings to the bushing. In order nevertheless to ensure a sufficient rigidity, the outer gripper rings are interconnected by additional, short ribs.
    A disadvantage is to be considered that for the production of a wealth of welding operations, at the same time, are necessary. It should also be noted that the bushing must be made of a metallic material, which allows joining by welding. Based on this, with regard to the sliding properties, it is possible to assume a non-optimal material pairing between bush and the associated guide pin on the valve. This disadvantage is particularly significant in dry running applications where lubrication can not be performed for a variety of reasons. The thermal drawing in the course of joining may require a reworking of the bushing, in particular the Füh¬rungsflächen. Since all components of the Abhebegreifers are made of metal, further results in a correspondingly high weight, whereby the possible dynamics is accordingly limited.
    EP 0 686 770 B1 shows a lift-off gripper for compressor valves with a carrier, as well as a number of gripper fingers mounted thereon. The gripper fingers are provided on their side facing the carrier with a holding element which interacts with the carrier in a form-fitting manner. This holding element has a positioning element, as well as a snap-in fixing element in the mounting position. The center of the carrier is formed as a bushing, through which the carrier is guided on a guide sleeve. In order to improve the guidance, or to reduce the friction losses, slip rings are provided within the guide sleeve.
    A disadvantage is the complex design of the guide area in order to ensure correspondingly positive sliding conditions even in dry running applications. The limited choice of material for the gripper fingers, which must have both sufficient strength for the operation, as well as a corresponding elasticity for the snap connection must be regarded as disadvantageous. Compared to the variant described above in which the gripper is made from solid, although the material cost is significantly reduced by the multi-part structure may result from the load of the gripper fingers but play, especially at the contact surfaces between the gripper fingers and the carrier. Although the weight is reduced to a lesser extent in comparison to the mentioned DE15 03 426 A1, the massive metallic carrier and the bush formed thereon also only allow a limited dynamic due to its weight.
    An object of the present invention is to be able to produce a lift-off gripper of the type mentioned in the introduction, for a valve element of a compressor valve as cost-effective as possible, and to avoid signs of wear, such as the occurrence of play between gripper fingers and their support structure.
    This object is achieved by means of a lifting gripper according to claim 1dadurch that the gripper finger is made of a first material, the Träger¬ bushing is made by a casting process from a second material and the gripper fingers is at least partially encapsulated by the material of the support sleeve. Due to the multi-part design and the at least partial pouring of the gripper finger, the lift-off gripper can be manufactured with minimal material costs. The fact that the Grei¬ferfinger is at least partially encapsulated in the carrier bush, the occurrence of play between the gripper finger and support structure in the form of the carrier bush, almost excludes. The casting method further allows a material-reduced Ausfüh¬ tion, which can be effectively saved weight. Depending on the choice of material, this effect can be even more pronounced.
    An advantageous embodiment provides that the carrier bushing has a guide region for guiding the lift-off gripper. The guide area is therefore already made when casting the carrier bush and the subsequent introduction of any bushings or Gleit¬ rings is not necessary. As a result, the number of components and the assembly cost is reduced, which in turn saves costs.
    In an advantageous manner, it is provided that the guide region is arranged on the radially inner peripheral surface of the carrier bushing. This allows a simple and space-saving construction, in which the lift-off gripper, for example, guided on a central guide pin.
    An advantageous embodiment provides that the carrier bushing is made of plastic or fiber-reinforced plastic. This allows a construction with the lowest weight and high strength. This, compared to metallic materials, low weight allows a high operating dynamics. If, as already stated, the guide region is formed by the carrier bushing, excellent sliding conditions result, especially in dry-running applications. Therefore, it is possible to dispense with the use of sliding elements on a guide pin of the lifting gripper, whereby the construction is correspondingly simplified.
    In a further advantageous manner, it is provided that the gripper finger is connected to a, the Ventil¬element facing, central region with a power transmission ring. Thus, the forces acting on the gripper fingers forces are not derived directly into the Trägerbuchs. The power transmission ring thus provides the lift-off gripper with additional stability and rigidity.
    An advantageous embodiment provides that the gripper finger at its the Ventilele¬ment facing central region has a groove and that the gripper finger is hooked by means of the groove at a first contact point between the power transmission ring and gripper fingers in the power transmission ring. By hooking on the first contact point between the power transmission ring and the gripper finger on the power transmission ring of the gripper finger is positioned accordingly without fixing elements or Verbindungs¬ elements such as screws or the like are necessary. If the casting-technical method for producing the carrier bushing is carried out following the hooking, the already positioned power transmission ring can also be at least partially encapsulated.
    An advantageous embodiment provides that the gripper finger is connected to a, the Ventilele¬ment remote, axial end with a cover ring. The forces occurring at the Grei¬ferfingern are derived via the, the valve element facing away from the axial end in the closing ring. As a result, the bushing is relieved and the Abhebe¬ gripper is given additional, additional stability.
    In an advantageous manner, it is provided that the gripper finger has a recess at its axial end remote from the valve element, that the end ring has as a second contact point between closing ring and gripper finger on its outer or inner radial peripheral surface a circumferential projection which cooperates with the recess of the gripper finger to in that the gripper finger engages with its recess in the encircling projection and thus in the terminating ring. Hooking provides an easy way to position and fix the end ring without having to provide appropriate fixation elements such as screws or the like. Other components are therefore eliminated, which reduces costs. Aligning any through holes or tapped holes, as would be necessary with the use of screws for fixing, is eliminated.
    An advantageous embodiment provides that the gripper finger and the Kraftübertragungs¬ ring are at least at the first contact point between the power transmission ring and Greiferfingerund / or the gripper fingers and the end ring at least at the second contact point between the closing ring and gripper fingers at least partially encapsulated by the material of Träger¬ bushing. This ensures a secure cohesion of all components in a simple way.
    A further advantageous embodiment provides that the carrier bushing has a section with non-circular cross-section. Since the gripper fingers are guided through corresponding slots in the valve seat, which are interrupted by radial webs, it is fundamentally necessary to prevent the gripper fingers from coming into contact with the radial webs of the valve seat as a result of rotation. This would lead to unwanted wear on the valve seat and the gripper fingers, possibly both damage or a possible malfunction, due to increased friction, the result. By means of a non-circular cross section, twisting can be effectively prevented when using a correspondingly shaped counterpart that is rotationally fixed with respect to the valve seat.
    A common, multi-part design, for example by plastic blocks screwed onto the valve seat, in contrast, causes significant additional costs and increased assembly costs.
    An advantageous embodiment provides that the guide region of the carrier bushing is designed as a non-circular section. This is in combination with a entspre¬chenden guide pin, which is provided for guiding the Abhebegreifers, realized at entsprechsprechendem cross section, in addition to the guide and a rotation.
    The subject invention will be explained in more detail below with reference to Figures 1 to 8, which show by way of example, schematically and not limiting advantageous Ausgestal¬tungen the invention. It shows
    1 is a sectional view of the unloading gripper according to the invention,
    2 shows a sectional view of the advantageously executed, preassembled Abhebegrei¬fers,
    3 shows a section along the line III-III in Figure 2,
    4 is a sectional view of the completed Abhebegreifers in a vorteilhaf¬ten embodiment,
    5 shows a section along the line V-V in Figure 4,
    6 is a perspective view of the lift-off gripper in combination with a Ververdichterventil,
    7 shows the lifting gripper, mounted on a compressor valve, in a plan view according to view A in FIG. 6, FIG.
    8 shows the lifting gripper within a reciprocating compressor.
    FIG. 1 shows a lifting gripper 1 according to the invention. In the illustrated embodiment, several gripper fingers 2, for example six, are used. By a casting process, for example die casting or injection molding, a carrier bushing 14 is formed, wherein the gripper fingers 2 are at least partially encapsulated by the material of the carrier bushing. The material from which the carrier bushing 14 is cast does not necessarily have to be the same material from which the gripper fingers 2 are made, although this possibility is of course not excluded. For the gripper fingers 2 may be provided a metallic material, for example a steel alloy, which has corresponding durability and wear resistance, whereby other materials are not excluded. Metallic materials may also be provided for the carrier bush 14, preferably with good sliding properties, such as bronze alloys, ie alloys with a high copper and tin content, since these alloys have good sliding properties and high resistance to material fatigue. In order to achieve the lowest possible total weight, the use of plastics, such as polyamides, which may additionally be made fiber-reinforced, is possible, in particular for the carrier bush 14. These have high strength, rigidity and also toughness with good sliding properties. Of course, other materials or material combinations can be used.
    Figure 2 shows an advantageous embodiment of the Abhebegreifer invention 1 in ei¬nem pre-assembled stage. In the illustrated embodiment, the gripper fingers 2 are connected to a central region 3 facing a valve element 30 shown in FIG. 6 with a power transmission ring 6 at the first contact points 7 between force transmission ring 6 and gripper fingers 2 (see also FIG. 3). The power transmission ring is preferably made of metal. The first contact points 7 between Kraftübertra¬ gungsring 6 and gripper fingers 2 are executed on the power transmission ring 6 in the form of Kontaktflächen8. Furthermore, each gripper finger 2 has at its central region 3 a groove 5, the depth and width of which is adapted to the contact surfaces 8 of the power transmission ring 6.
    The gripper fingers 2 are hooked by means of their grooves 5 at one of the first contact points 7 zwi¬schen power transmission ring 6 and gripper fingers 2 and are positioned over the contact surfaces 8. Characterized in that the bottom of the grooves 5 at the, remote from the Ventilelement30 top of the power transmission ring 6, which also represents a contact surface 8 comes to rest, the axial position of the gripper fingers 2 is fixed. By hooking the gripper fingers 2 are positioned on the power transmission ring 6 in position.
    Each gripper finger 2 is further, at its, the valve member 30 facing away from, axial end 4, connected to a cover ring 10. For this purpose, the gripper fingers 2 at its axial end 4 at a second contact point 11 between the end ring 10 and gripper finger 2 each have a recess 9, for example, an inwardly or outwardly facing,
    Nut, up. The end ring 10 has at the second contact points 11 between Abschluss¬ ring 10 and gripper fingers 2 on its inner or outer radial peripheral surface a circumferential projection 12 which cooperates with the recess 9 of each gripper finger 2 hin¬ going that the gripper fingers 2 with their recesses. 9 engage in the circumferential projection 12 and thus in the end ring 10.
    Of course, a design in which it is dispensed with the power transmission ring 6und / or on the end ring 10, conceivable. If the force transmission ring 6 is dispensed with, the central area 3 of the gripper finger 2 does not have to have a groove 5, as is also shown in FIG. If the terminating ring 10 is dispensed with, the gripper finger 2 does not have to have a recess 9 at its axial end 4 facing away from the valve element 30 on its inner or outer radial peripheral surface, as already illustrated in FIG.
    As already mentioned, the gripper fingers 2 are already positioned by hooking on the power transmission ring 6 in a certain position. Due to the recess 9, the wall thickness of the gripper fingers 2 at the second contact point 11 between the end ring 10 and the gripper fingers 2 is reduced, which allows some elastic deformation. This allows the terminating ring 10 to snap in at the second contact point 11 between the terminating ring 10 and the gripper finger 2.
    The preassembled lifting gripper 1 shown in this way, in FIG. 2, already has a certain cohesion of the individual components, which facilitates the handling of the scraper gripper 1 which is not yet fully formed in the following step.
    The illustrated embodiment of the first contact point 7 between the power transmission ring 6 and gripper fingers 2 and the second contact point 11 between the end ring 10 and gripper fingers 2 represents a simple variant, which can be hersteilen with low production costs and allows quick and easy installation. Of course, other positive and / or non-positive embodiments in the design of the first contact point 7 zwi¬schen power transmission ring 6 and gripper fingers 2 and the second contact point 11 between cap 10 and gripper fingers 2, for example by appropriate thread, ande¬ren forms of connectors or the like possible.
    FIG. 3 shows a section along the line III-III in FIG. 2. By way of example, the force transmission ring 6 is designed for six gripper fingers 2 with corresponding contact surfaces 8 in a regular arrangement.
    The power transmission ring 6 is executed, for example, at the first contact point 7 between the power transmission ring 6 and the gripper finger 2 by groove-shaped recesses 12 on the outer and / or inner circumferential surface of the power transmission ring 6. The resulting contact surfaces 8 are formed in the bottom of the groove-shaped recesses 12, and on the upper side of the force transmitter 6. At the edges formed on Nutarund the groove-shaped recesses 12, which adjoin the contact surfaces 8, bogenför¬mige recesses 13 are provided, through which free spaces 19 between the power transmission ring 6 and the central region 3 of the gripper fingers 2 at the first Kontakt¬ 7 point between the power transmission ring 6 and gripper fingers 2 are formed. The advantage of the arcuate recesses 13 and the spaces 19 formed by them is explained in more detail in the following description of FIG. The gripper fingers 2 are hooked into the power transmission ring 6, so that the inner surfaces of the grooves 5 abut against the Kontaktflä¬ 8 and the gripper fingers 2 are positioned in the radial and axial directions.
    FIG. 4 shows a sectional view of a finished lifting gripper 1 in an advantageous embodiment. As already described with reference to FIG. 1, the carrier bushing 14 is formed by a casting process, for example die casting or injection molding, in which the unloading gripper 1 already described in a preassembled state according to FIG. 2 is introduced into an appropriate casting mold. The gripper fingers 2, the power transmission ring 6 and the end ring 10 are at least partially encapsulated by the material of the carrier bushing 14. By encapsulating the individual components, the secure cohesion of the individual components is ensured, wherein the forces acting on the gripper finger 2 during operation of the lift-off gripper 1 are absorbed, primarily by the force-transmitting ring 6 and the closing ring 10. In order to ensure the best possible Ein¬binden the gripper fingers 2 in the support sleeve 14, at least one opening 16 may be provided in those areas of the gripper fingers 2, which are poured, which is traversed in the course of casting the support bush 14 of their material and filled. As can be seen in FIG. 1, however, the presence of a breakthrough 16 is not absolutely necessary.
    The arc-shaped recesses 13, already described in FIG. 3, on the inner edges of the groove-shaped recesses 12 formed on the groove base adjoining the contact surfaces 8 allow the material of the carrier bushing 14 the central area 3 of the gripper fingers 2 and the power transmission ring 6 on the first contact point 7 between power transmission ring 6 and gripper finger 2 to flow well during the casting and also, at least partially enclose the, the valve element 30 facing the underside of the Kraftübertragungsring6. As a result, a possible loosening of the power transmission ring 6, during operation, effectively prevented and in turn ensures a safe cohesion of all components.
    For the same reason, the second contact point 11 between the end ring 10 and gripper fingers 2 is at least partially encapsulated by the material of the carrier bush 14. In order to ensure a better cohesion between the carrier bushing 14 and the end ring 10, grooves or grooves 15 which encircle the rear end of the carrier bushing 14 at least partially can be provided on Har änftaran raHialan I Imfannsflänha Has Ahsrhli issrinns 7iiminHast.
    The carrier bush 14 has at its radially inner circumferential surface a Führungsbe¬reich 17, which serves in combination with a guide pin 32 (as shown in Figure 6 darge), to guide the Abhebegreifers 1. By way of example, the carrier bushing 14 is made of plastic or fiber-reinforced plastic, preferably a tribologically favorable plastic material, resulting in excellent sliding conditions at the guide region 17, especially in dry running applications. The use of sliding elements on the guide pin 32 of the lifting gripper 1 can therefore be dispensed with, which simplifies the construction accordingly.
    Figure 5 shows a section along the line V-V in Figure 4. Figure 5 shows basically the structure already shown in Figure 3, but in the finished situation. Dabeisind the free spaces 19 at the first contact point 7 between the power transmission ring 6 and gripper fingers 2 are poured through the material of the support sleeve 14. As a result, no relative movement is possible between the central region 3 of the gripper fingers 2 and the force transmission ring 6. The gripper fingers 2 are free of play and without the use of any Fixie¬relemente, such as screws or the like, connected to the power transmission ring 6. The same naturally also applies to the second contact point 11 between closing ring 10 and gripper finger 2.
    In principle, as already mentioned in the description of FIG. 2, other possibilities are also possible in the formation of the first contact point 7 between the force transmission ring 6 and the gripper finger 2. For example, with appropriate design of the first contact points 7 between the power transmission ring 6 and gripper fingers 2, a nachträgli¬ches, so after completion of casting, screwing the Kraftübertragungsringes6 in the central region 3 of the gripper fingers 2 and 14 in the carrier sleeve conceivable.
    FIG. 6 shows a perspective view of the lift-off gripper 1 in combination with a compressor valve 40, as used, for example, in reciprocating compressors. A Ververdichterventil 40 usually consists of valve seat 20, valve member 30 and valve catcher31. The gripper fingers 2 are guided through corresponding slots 21 in the valve seat 20, which are interrupted by radial webs 22. It is fundamentally advantageous to prevent the gripper fingers 2 from coming into contact with the radial webs 22 of the valve seat 20 as a result of rotation. This would lead to undesirable wear on the valve seat 20 and the gripper fingers 2, possibly both damage or have a possible Fehlfunktion¬ tion due to increased friction result. The carrier bushing 14 may therefore have a portion 18 of non-circular cross-section, which coincides with the guide portion 17 by way of example. The radial peripheral surface of the guide pin 32 is executed in the same way as the non-circular cross section of the guide region 17 of the carrier bush 14, wherein the guide pin 32 is designed with respect to the compressor valve 40 rotationally fixed. Due to the interaction of the peripheral surface of the guide pin 32 and the non-circular cross section of the portion 18 of the carrier bush 14, a rotation of the unloading gripper 1 relative to the valve seat 20 is prevented. Section 18, with its non-circular cross-section, may also be formed at a different location on the radially inner peripheral surface of the carrier bush and does not necessarily coincide with the guide region 17.
    Figure 7 shows the lift-off gripper 1 mounted on the compressor valve 40, in a plan view according to view A in Figure 6. The gripper fingers 2 are guided through the slots 21 through the valve seat. The non-circular cross section of the portion 18, which, as in Figure 6 erläu¬tert, prevents unwanted rotation of the Abhebegreifers 1 relative to the valve seat 20 and thus a contact of the gripper fingers 2 with the radial webs 22 is well visible in the center of the carrier sleeve 14.
    FIG. 8 shows the lifting gripper 1 in the activated position, when it is used in a piston compressor 50, which consists of at least one compressor valve (40) with at least one valve element (30) and which is shown only schematically. The gripper fingers 2 protrude through the valve seat 20 and press the valve element 30 against the spring force of the springs 33 against the valve catcher 31. Only schematically is the actuating device 34 shown, via which the lift-off gripper 1 is actuated.
    As a result of the illustrated, activated position of the lift-off gripper 1, a compression medium, for example, is pushed back into the suction chamber 36 by the upward movement of the piston 35. This has the consequence that the delivery rate and thus also the power consumption of the reciprocating compressor 50 is reduced, whereby this effect can be used, for example, in the course of idling control or during startup with minimum load.
    权利要求:
    Claims (13)
    [1]
    1. Abhebegreifer (1) for a valve element (30) of a compressor valve (40) consisting of at least one gripper finger (2) and a carrier bush (14), gekennzeichnet characterized in that the gripper finger (2) is made of a first material in that the carrier bushing (14) is produced by a casting process from a second material and the gripper finger (2) is at least partially encapsulated by the material of the carrier bushing (14).
    [2]
    Second lifting gripper (1) according to claim 1, characterized in that the Trägerbuch¬se (14) has a guide portion (17) for guiding the Abhebegreifers (1).
    [3]
    3. lifting gripper (1) according to claim 2, characterized in that the Führungsbe¬reich (17) on the radially inner circumferential surface of the carrier bush (14) is arranged.
    [4]
    4. Lifting gripper (1) according to one of claims 1 to 3, characterized in that the carrier bushing (14) is made of plastic or fiber-reinforced plastic.
    [5]
    5. Lifting gripper (1) according to one of claims 1 to 4, characterized in that the gripper finger (2) on a, the valve element (30) facing the central region (3) is connected to a power transmission ring (6).
    [6]
    6. Lifting gripper (1) according to claim 5, characterized in that the gripper finger (2) at its the valve element (30) facing the central region (3) has a groove (5) and that the gripper finger (2) by means of the groove (5) at a first contact point (7) zwi¬schen power transmission ring (6) and gripper finger (2) in the power transmission ring (6) is einge¬hakt.
    [7]
    7. Lifting gripper (1) according to at least one of claims 1 to 6, characterized gekenn¬zeichnet that the gripper finger (2) on one, the valve element (30) facing away from the axial end (4) with a closing ring (10) is connected.
    [8]
    8. lifting gripper (1) according to claim 7, characterized in that the gripper finger (2) facing away from the valve element (30), the axial end (4) has a recess (9) that the closing ring (10) as a second contact point ( 11) between the closing ring (10) and gripper fingers (2) on its outer or inner radial peripheral surface has a circumferential projection (12) which cooperates with the recess (9) of the gripper finger da¬hing, that the gripper finger with its recess ( 9) engages in the circumferential projection (12) and thus in the end ring (10).
    [9]
    9. lift-off gripper (1) according to at least one of claims 6 or 8, characterized gekenn¬zeichnet that the gripper finger (2) and the power transmission ring (6) at least at the first contact point (7) between the power transmission ring (6) and gripper fingers ( 2) and / or the gripper fingers (2) and the closing ring (10) at least at the second contact point (11) zwi¬ closing ring (10) and gripper fingers (2) at least partially encapsulated by the material of Trä-gerbuchse (14).
    [10]
    10. Lift-off gripper (1) according to at least one of claims 1 to 9, characterized gekenn¬zeichnet that the carrier bush (14) has a portion (18) with non-circular cross-section.
    [11]
    11. Lift-off gripper (1) according to claim 10, characterized in that the guide region (17) of the carrier bush (14) is designed as a non-circular section (18).
    [12]
    12. A method for producing a Abhebegreifers (1) for a valve element (30) of a Ver¬dichterventils (40), consisting of at least one gripper finger (2) and a carrier bush (14), characterized in that the carrier bush (14) by a casting method is made while the gripper finger (2) is at least partially encapsulated by the material of the support sleeve (14).
    [13]
    13. piston compressor (50) consisting of at least one compressor valve (40) with zumin¬dest a valve element (30) and a cooperating Abhebegreifer (1), characterized in that the lift-off gripper (1) according to at least one of Ansprü¬che 1 bis 11 is executed.
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    AT504695B1|2006-12-22|2008-12-15|Hoerbiger Kompressortech Hold|SUCTION VALVE WITH REMOVABLE GRIPPER|
    AT509878B1|2010-12-15|2011-12-15|Hoerbiger Kompressortech Hold|SUCTION VALVE WITH REMOVABLE GRIPPER|
    EP2683950B1|2011-03-10|2016-07-20|Dresser-Rand Company|Electronic infinite step controller actuator|
    AT511238B1|2011-04-14|2013-03-15|Hoerbiger Kompressortech Hold|PISTON COMPRESSORS WITH CONVEYOR RANGE CONTROL|US10036376B2|2015-04-17|2018-07-31|Westinghouse Air Brake Technologies Corporation|Railway vehicle air compressor with integral high pressure cylinder unloader valve|
    US10352320B2|2015-04-17|2019-07-16|Westinghouse Air Brake Technologies Corporation|Valve connector for integral high pressure cylinder unloader valve|
    ITUB20150797A1|2015-05-22|2016-11-22|Nuovo Pignone Tecnologie Srl|VALVE FOR AN ALTERNATIVE COMPRESSOR|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50773/2013A|AT514580B1|2013-11-21|2013-11-21|Lifting gripper for a valve element of a compressor valve|ATA50773/2013A| AT514580B1|2013-11-21|2013-11-21|Lifting gripper for a valve element of a compressor valve|
    EP14187146.7A| EP2876303B1|2013-11-21|2014-09-30|Lifting gripper for a valve element of a compressor valve|
    US14/516,840| US9562527B2|2013-11-21|2014-10-17|Unloader for a valve element of a compressor valve|
    CN201410673733.1A| CN104653445B|2013-11-21|2014-11-21|Valve components for compressor valve lift clamper and its manufacture method|
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