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    • 专利摘要:
    Provided are a contact system (10) in a low-voltage switch, and a low-voltage switch (1). The contact system comprises a bifurcated contact (20) and a movable contact (30). The bifurcated contact has an upper bifurcated end (202a-1) and a lower bifurcated end (202a-2). Electrical contact parts (204a, 206a) are respectively arranged on insides of the upper bifurcated end and the lower bifurcated end. Electrical contact parts (304,306) are respectively arranged on an upper and lower surface of an execution end of the movable contact corresponding to the electrical contact parts of the bifurcated contact. When the contact system is switched on and powered up, electrodynamic repulsive forces produced at the electrical contact parts of the bifurcated contact are offset, so that the contact system can stably maintain an on-state, thereby improving a short-time current withstand capability of a low-voltage switch using the contact system.
    公开号:ES2659083A2
    申请号:ES201790055
    申请日:2015-11-05
    公开日:2018-03-13
    发明作者:Yin Nan；Jinbao Zhu；Jinying LI；Kanyuan LIU
    申请人:Beijing Peoples Electric Plant Co Ltd；
    IPC主号:
    专利说明:

    A contact system in a low voltage switch and a low voltage switch
    Technical field
    The present description refers to the electric field, and more particularly, to a contact system in a low voltage switch and a low voltage switch.
    Background
    As an important component of low-voltage electrical appliances, the switches have an important performance index, which is the ability to withstand a short-lived current. Most existing low-voltage switches, such as Class B circuit breakers, disconnecting bodies, have some capacity to withstand a short-term current, but sometimes they do not meet the high demand for capacity to withstand a short-circuit current. duration in some application scenarios such as dual energy conversion systems.
    The contact system is the central part of the low voltage switch, which generally includes a mobile contact and a fixed contact, and the low voltage switch turns on / off when the mobile contact is connected / disconnected to the fixed contact. To improve the ability to withstand a short-lived current of the low voltage switch, the existing practice is to modify the fixed contact of a repulsive force structure to a non-repulsive force structure, while increasing the final pressure of the removable contact . However, this practice cannot significantly improve the ability to withstand a short-lived current of the low voltage switch due to the presence of electrodynamic force in the electrical contact portions of the mobile contact and the fixed contact in the contact system. In addition, increasing the final pressure of the mobile contact will result in a sharp increase in the local resistance of the rotating shaft used to hold the mobile contact, which places a greater demand on the material, structure, process, and shaft housing, The difficulty of design and production is significantly increased.
    Sum rio
    In view of the aforementioned problems, the present description provides a contact system in a low voltage switch and a low voltage switch.
    According to one embodiment of the present description, a contact system comprises a bifurcated contact and a mobile contact, wherein the bifurcated contact has an upper bifurcated end and a lower bifurcated end, wherein the electrical contact portions are respectively arranged in inside the upper bifurcated end and at the lower bifurcated end, the electrical contact portions are disposed respectively on the upper and lower surfaces of an execution end of the mobile contact corresponding to the electrical contact portions of the bifurcated contact, when the system of contact is switched on and energized, the electrodynamic repulsive forces produced in the electrical contact portions of the bifurcated contact are compensated, so that the contact system can stably maintain an ON state.
    In one embodiment, the bifurcated contact is U-shaped or C-shaped, and when the contact system is turned on and energized, the current flowing through the upper bifurcated end is less than the current flowing through the bifurcated end lower, where the bifurcated contact is arranged with a central rotation hole, the current is distributed from the central rotation hole to the upper bifurcated end and the lower bifurcated end, and the resistance of the upper bifurcated end is greater than that of the end lower fork.
    In one embodiment, the bifurcated contact and the electrical contact portions of the bifurcated contact form an integral structure with a homogeneous material. Alternatively, the bifurcated contact portions except the electrical contact portions are of a combinatorial structure with multiple connection pieces in the thickness direction or a monolithic structure, wherein the material of at least one of the multiple contact parts has a modulus of elasticity greater than that of the rest of the multiple contact pieces.
    In one embodiment, the electrical contact portions of the bifurcated contact and the extraction contact are of low contact resistance and are made of electric arc resistant material.
    In one embodiment, where all or part of the surfaces of the electrical contact portions of the upper bifurcated end and the lower bifurcated end facing each other are arc surfaces, arc surfaces are used for electrical contact and for making space in the process of connecting or disconnecting the bifurcated contact with the mobile contact.
    In one embodiment, the bifurcated contact is Y-shaped or V-shaped, when the contact system is turned on and energized, the current flowing through the upper bifurcated end is equal to the current flowing through the lower bifurcated end .

    In one embodiment, the bifurcated contact is provided with a restoration structure to restore the bifurcated contact with the assistance of a spring or restoration clips after the bifurcated contact is disconnected with the removable contact.
    According to one embodiment of the present description, a low voltage switch comprises an arc extinguishing chamber, an operating mechanism and a contact system described above.
    In the low voltage switch with the contact system according to one embodiment of the present description, a Holm electrodynamic repulsion force is generated between the bifurcated contact and the mobile contact when the contact system is in the ON state and has current flowing through it. The Holm force in the electrical contact portion of the upper bifurcated end of the bifurcated contact is perpendicular to the arc surface of the electrical contact portion of the upper bifurcated end and is directed to the arc center of the arc surface, and the force Holm in the electrical contact portion of the lower bifurcated end is perpendicular to the arc surface of the electrical contact portion of the bifurcated end and is directed to the center of the arc of the arc surface. The loop current is distributed at the center of rotation of the bifurcated contact, and a reasonable current distribution ratio causes the electrodynamic repulsion forces generated at the electrical contact portions of the two bifurcated ends of the bifurcated contact to compensate each other. Considering the Lorentz force circuit, the contact system according to the modalities of the present description can remain stably in the ON state when it crosses a large current such as a short-circuit current, thereby improving the ability to withstand a short-lived current of the low voltage switch.
    A series of simplified concepts are introduced in the Summary section of the description, which will be described in more detail in the Detailed Description section. The present description is not intended to limit the critical characteristics and essential technical characteristics of the claimed solutions, and is not intended to determine the extent of protection of the claimed technical solution.
    The advantages and characteristics of the present description will be described in detail below with reference to the accompanying drawings.
    Brief description of the drawings
    The following drawings of the present application are incorporated herein as part of the present application for illustration. The modalities shown in the drawings and description are used to explain the principles of the description. In the drawings:
    Figure 1 is a cross-sectional structural diagram of a low voltage switch according to an illustrative embodiment of the present description;
    Figure 2 is a structural diagram of a bifurcated contact according to a first illustrative embodiment of the present description;
    Figure 3 is a structural diagram of a bifurcated contact according to a second illustrative embodiment of the present description;
    Figure 4 is an assembly diagram of the bifurcated contact shown in Figure 2 on a low voltage switch;
    Figure 5 is an assembly diagram of the bifurcated contact shown in Figure 3 on a low voltage switch;
    Figure 6 is a structural diagram of an extraction contact according to an illustrative embodiment of the present description;
    Figure 7 is a diagram of the assembly section of the extraction contact shown in Figure 6 and a rotating shaft;
    Figure 8 is a structural diagram of a contact system according to a first illustrative embodiment of the present description;
    Figure 9 is a structural diagram of a contact system according to a second illustrative embodiment of the present description;
    Figure 10 is a force analysis diagram of the contact system in the second illustrative mode shown in Figure 9 and in the ON state; Y

    Figure 11 is a schematic diagram of a contact system in the ON state according to a third illustrative embodiment of the present description.
    Detailed description
    The illustrative modalities and the characteristics of the various aspects of the present description will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the description. However, it will be apparent to one skilled in the art that the present description can be practiced without the need for some of the details in these specific details. The following description of the modalities is only for the purpose of providing a better understanding of the present description by showing examples of the present description. The present description is not limited in any way to any of the specific configurations and algorithms set forth below, but is intended to cover any modification, replacement and improvement of elements, components and algorithms without departing from the spirit of the description. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present description.
    Figure 1 shows a structural diagram in cross section of a low voltage switch according to an embodiment of the present description. As shown in Figure 1, the low voltage switch 1 mainly comprises a contact system 10, an arc extinguishing chamber 12 and an operating mechanism 14, wherein the contact system 10 includes a bifurcated contact 20 and a contact mobile 30.
    In the low voltage switch 1 shown in Figure 1, the on and off of the low voltage switch VOltage 1 is controlled by controlling the connection and disconnection of the bifurcated contact 20 and the mobile contact 30, and the connection and disconnection of the bifurcated contact 20 and the mobile contact 30 is controlled by the operations of the operating mechanism 14. An electric arc generated during the process of disconnecting the bifurcated contact 20 with the mobile contact 30 is introduced into the arc extinguishing chamber 12, to finally extinguish the electric arc by using the arc extinguishing chamber 12.
    Figure 2 shows a structural diagram of the bifurcated contact according to a first embodiment of the present description. As shown in Figure 2, the bifurcated contact 20a includes a U-shaped connector 202a and two electrical contact portions 204a and 206a located within the two bifurcated ends 202a-1 and 202a2 of the U-shaped connection body 202a (also referred to below as an upper bifurcated end and a lower bifurcated end), respectively. In the present embodiment, slots 202a-1-1 are provided on both sides of the upper bifurcated end 202a-1 of the U-shaped connecting body 202a, so that the thickness of the upper bifurcated end 202a-1 is less than that of the lower bifurcated end 202a-2 of the U-shaped connecting body. The electrical contact portions 204a and 206a are of low contact resistance and are formed of electric arc resistant material and the outer surfaces thereof which face each other can designed to be partially or completely arc surface (although the external surfaces of the electrical contact portions 204a and 206a shown in Figure 2 that face each other are configured on a partial arc surface). In addition to being used for electrical contact, the arc surface design of the opposite outer surfaces of the electrical contact portions 204a and 206a are also used to make space during the process of connecting or disconnecting the bifurcated contact 20a with the movable contact 30 The electrical contact portions 204a and 206a can be connected to the respective inner surfaces of the two bifurcated ends 202a-1 and 202a-2 of the U-shaped connecting body 202a by means of welding, thyme connection, rivet connection, etc.
    As shown in Figure 2, the U-shaped connection body 202a is also provided with a rotation hole 210a-1, and the U-shaped connection body 202a is mounted on a mounting bracket by means of a shaft mounting through the rotation hole 210a-1 (the center of the rotation hole 210a acts as the center of rotation of the bifurcated contact 20a). The rotation hole 210a-1 can be arranged in the lower center position of the bifurcated contact 20a for the purpose of reliably separating the bifurcated contact 20a from the movable contact 30 during the disconnection process. In addition, the position of the rotation hole 210a-1 in the bifurcated contact 20a determines the position where the current flows in or out of the bifurcated contact 20a when the bifurcated contact 20a is connected to the movable contact 30 (i.e., the hole of rotation 210a -1 is the point of entry or exit of current flow in the bifurcated contact 20a). On both sides of the U-shaped connecting body 202a, a circular projection 210a is provided outside the rotation hole 210a-1. When the bifurcated contact 20a is mounted on the low voltage switch through the mounting bracket, the mounting bracket has a clamping force on the circular projections 210a on both sides of the U-shaped connecting body 202a, and during the rotation of the bifurcated contact 20a, the circular projections 210a can reduce frictional forces. In addition, the circular projection 210a can also be used to improve the conductive condition between the bifurcated contact 20a and the mounting bracket and to maintain the contact resistance between the bifurcated contact 20a and the stable mounting bracket when the bifurcated contact 20a rotates.
    In addition, the bifurcated contact 20a is arranged with a restoration structure and is restored with the help of a spring or landslides. Specifically, as shown in Figure 2, a positioning hole 212a is disposed in the U-shaped connecting body 202a of the bifurcated contact 20a, and a protuberance 20Ba is disposed on the outer side of the lower bifurcated end 202a-2 of the U-shaped connection body 202a for positioning the spring or recovery ctips 16, to restrict the bifurcated contact 20a.
    Figure 3 shows a structural schematic diagram of a bifurcated contact according to a second embodiment of the present description. As shown in Figure 3, the bifurcated contact 20b includes a U-shaped connection body 202b and two electrical contact portions 204b and 206b disposed within the two bifurcated ends 202b-1 and 202b-2 of the connection body in U-shape 202b, respectively. The U-shaped connection body 202b may comprise three U-shaped connection pieces 20b-1, 20b-2 and 20b-3 that are combined in the thickness direction, where the U-shaped connection piece 20b -2 stands between the U-shaped connection pieces 20b-l and 20b-3. The U-shaped connection pieces 20b-1 and 20b-3 on both sides have respective slots 202b-1-1 on these and have the same material (for example, copper), and the U-shaped connection piece 20b -2 in the middle is a U-shaped connection piece of equal thickness and its material (for example, stainless steel) has a modulus of elasticity greater than the U-shaped connection pieces 20b-1 and 20b-3 in Both sides of this. The outer surfaces of the electrical contact portions 204b and 206b facing each other are all arc surfaces and the electrical contact portions 204b and 206b can be connected to the inner surfaces of the two bifurcated ends 202b-1 and 202b-2 of the connection body 202b by welding, connection by thyme, rivet connection, etc.
    As shown in Figure 3, a rotation hole 210b-1 is disposed below the center of the bifurcated contact 20b, and a positioning hole 212b is disposed above the rotation hole 210b-1, and the circular projection 210b is It has outside the rotation holes 210b-l on both sides of the U-shaped connecting body 202b. It should be noted that the functions of the rotation hole 210b-1, the circular projection 210b and the positioning hole 212b shown in Figure 3 they are similar to the corresponding portions in Figure 2, which will not be repeated here.
    Figure 4 shows an assembly diagram of the bifurcated contact shown in Figure 2 on a low voltage switch. Figure 5 shows an assembly diagram of the bifurcated contact shown in Figure 3 on a low voltage switch. As shown in Figures 4 and 5, the rotating shaft 402 passes through the rotation hole 210a-1 f210b-1 of the bifurcated contact 20af20b to make the bifurcated contact 20af20b in the center of the support 40, so that the bifurcated contacts 20af20b are fixed in the U-shaped groove inside the housing of the low-voltage switch housing 1. The adjusting devices 406 on both sides of the support 40 ensure that the contact pressure of the support 40 with the bifurcated contacts 20af20b is stable and meets the temperature rise requirement. The hole of the support 40 coupled with the rotating shaft 402 is in loose fit with the rotating shaft 402 in consideration of the influence of the manufacturing error, which is used to reduce the influence on the fixed positions of the bifurcated contact 20aJ20b and the contact mobile 30.
    As shown in Figures 4 and 5, the support 40 and a connection plate 80 located on the inner side of the lower surface of the support 40 are provided with holes the 802 having the same upper and lower openings. The support 40 is connected to the connection plate 80 by means of a screw through the holes 802, and its effective contact areas are secured while the temperature increase requirements are met. The lower surface of the support 40 is provided with a hole 410 at the front end thereof, and the support 40 is connected to the housing of the low voltage switch 1 by means of a thyme through the hole 410. The projection 408 near the hole 410 in the front end of the bottom surface is used to place the bracket 40 in the low voltage switch housing
    one.
    Figure 6 shows a structural diagram of a mobile contact according to an embodiment of the present description. As shown in Figure 6, the movable contact 30 includes a Z-shaped inverted connection body 302 and electrical contact portions 304 and 306 in an upper plane 302-1 and a lower plane 302-2 of the shaped projection duckbill of the execution end of the inverted connection body in the form of Z 302, respectively. Since a slope 302-3 for making space is present at the execution end of the movable contact 30, the electrical contact portions 304 and 306 are staggered back and forth. In addition, the edge of the electrical contact portion 304 is removed from the sharp corner and can be arranged in a circular arc shape 304-1 to prevent the interference of movement of the bifurcated contact 20 and the moving contact 30 during its transition in the states on and off. In addition, the central rotation hole 302-4-1 and a U-shaped groove 302-4-2 are provided in the rod portion 302-4 of the movable contact 30.
    Figure 7 shows a diagram of the assembly section of the mobile contact shown in Figure 6 and a rotating shaft. As shown in Figure 7, the spring 506 to provide the final pressure for the movable contact 30 assembles the movable contact 30 and the rotary axis 50 together with the aid of a double shoulder shaft 504 assembled in the U-shaped groove 302-4-2 of the mobile contact 30 and an axis 502 passing through the central rotation hole 302-41 of the mobile contact 30.
    Specifically, as shown in Figures 6 and 7, the spring 506 to provide the final pressure for the mobile shell 30 is mounted on the axis 502 passing through the central rotation hole 302-4-1 of the mobile contact 30, the lateral U-curved surface of the spring 506 cooperates with the axis 502, and the two long arms act on the double shoulder axis 504 assembled in the U-shaped groove 302-4-1 of the movable contact 30. The movable contact 30 rotates around the axis 502 that passes through the central rotation hole 302-4-1 and its center of rotation coincides with the center of the axis 502 that passes through the central rotation hole 302-4-1. The advantage of this central coincidence is that it is possible to guarantee the uniqueness of the fixed position between the mobile contact 30 and the bifurcated contact 20 when connected. By the action of spring 506 towards shoulder 214, there is still a good electrical contact between the
    bifurcated contact 20 and mobile contact 30 when in the ON state, even if the electrical contacts of the bifurcated contact 20 and / or the mobile contact 30 have loss of combustion. In addition, a groove 3024-3 is provided in the rod portion 302-4 of the movable contact 30, which is used to weld the position of the flexible cables.
    Figure 8 shows a schematic structural diagram of a contact system (which includes the bifurcated contact 20a shown in Figure 2 and the mobile contact 30 shown in Figure 6) according to a first embodiment of the present description. . The principle of restoring the bifurcated contact 20a shown in Figure 2 will be described with reference to Figures 1, 4 and 8. Specifically, a thyme through the hole 410 in the bottom surface of the support 40 connecting the support 40 to the Low voltage switch housing has a part above the floor of the bracket used to place the spring or restoration clips 16 (see Figure 1). When the bifurcated contact 20a is disconnected from the mobile contact 30, the bifurcated contact 20a is turned counterclockwise under the action of the mobile contact 30 to reach a completely separate position of the mobile contact 30. The bifurcated contact 20a continues to rotate counterclockwise by the elastic force of the spring / restoration dips 16 (see Figure 1) until the bifurcated contact 20a stops inside the projections 13-2 of the large support 13 with the restrictions of position of the projections 13-2 of the large support 13 to the axis 404 passing through the positioning hole 212a, to prepare for the next connection with the movable contact 30. The restoration springs / dips 16 serve to allow the bifurcated contact 20th continue turning to make space. The angle of the bifurcated contact 20a in the stop position causes the electrical contact portion 306 of the movable contact 30 to come in contact with the electrical contact portion 206a of the bifurcated contact 20a at the beginning during the ignition process, so that the contact Fork 20a and the mobile contact 30 can connect successfully. If there are no restoration springs / dips 16 (see Figure 1), the bifurcated contact 20a will remain in a completely separate position from the movable contact 30, and the electrical contact portion 306 of the movable 3D contact may first come into contact with the end upper bifurcated 202a-1 of the bifurcated contact 20a during the following ignition process, which causes wear of the outer surfaces of the electrical contact portion 306 of the movable contact 30 and the upper bifurcated end 202a-1 of the bifurcated contact 20a or causes the bifurcated contact and the mobile contact cannot connect.
    Figure 9 shows a schematic structural diagram of a contact system (which includes the bifurcated contact 20b shown in Figure 3 and the mobile contact 30 shown in Figure 6) in accordance with the second embodiment of the present description. . The restoration principle of the bifurcated contact 20b will be described below with reference to Figures 5 and 9. One end of the recovery spring is connected to the positioning shaft 404 and the other end is connected to the projection 13-1 of the large support 13 When the contact system is turned on, the recovery springs extend and the tension to the bifurcated contact 20b in the positioning hole 212b is along the direction of the axis of the springs. When the bifurcated contact 20b is disconnected with the mobile contact 30, the bifurcated contact 20b is turned counterclockwise under the actions of the mobile contact 30 and the restoration springs until the bifurcated contact 20b stops inside of the projections 13-1 of the large support 13 finally with the positional restrictions of the projections 13-2 of the large support 13 to the axis 404 passing through the positioning hole 212b, to prepare for the next connection with the mobile contact 30 .
    Figure 10 shows a schematic diagram of the force analysis of the contact system shown in Figure 9 in the ON state. F1 is the initial pressure of the electrical contact portion 304 of the mobile contact 30 to the electrical contact portion 204b of the bifurcated contact 20b in the ON state, and F2 is the initial pressure of the electrical contact portion 306 of the mobile contact 30 a the electrical contact portion 206b of the bifurcated contact 20b in the ON state. After energizing, the total current I will be distributed at the center of rotation 210b-1 (A) of the bifurcated contact 20b. The current flowing through the upper bifurcated end 202b-1 of the bifurcated contact 20b and the electrical contact portion 204b within the upper bifurcated end 202b-1 is defined as 11, and the current flowing through the lower bifurcated end 202b- 2 of the bifurcated contact 20b and the electrical contact portion 206b within the lower bifurcated end 202b-2 is 12. The electrodynamic repulsive force of Holm is generated between the upper and lower contacts of the electrical contact portions of the bifurcated contact 20b and the movable contact 30 due to the contraction of the current, and FH1 is the force of Holm in the electrical contact portion 204b within the upper bifurcated end 202b-1 of the bifurcated contact 20b and FH2 is the force of Holm on the electrical contact portion 206b within the lower bifurcated end 202b-2 of the bifurcated contact 20b. As shown in Figure 10, F1, FH1, F2 and FH2 are perpendicular to the arc surfaces of the electrical contact portions 204b, 206b within the two bifurcated ends of the bifurcated contact 20b, respectively, and point to their respective centers arc in opposite directions, the force F in the positioning hole 212b
    (C) of the bifurcated contact 20b is the tensile force of the recovery spring towards the bifurcated contact 20b, M is the torque of the movable contact 30 provided by the final pressure spring 506, Fax, Fay is the reaction force of the bifurcated contact 20b at its central rotation hole 210b-l, and Fbx, Fby is the reaction force of the movable contact 30 at its central rotation hole 302-4-1 (B).
    In the ON state, the initial pressure F1, F2 at the electrical contact portions 204b and 206b within the two bifurcated ends 202b-1 and 202b-2 of the bifurcated contact 20b can be obtained based on the force and torque balance equations of the contact system. After energization, the pressures at the electrical contact portions 204b and 206b at the two bifurcated ends 202b-1 and 202b-2 of the bifurcated contact 20b are changed to F1 'and F2' under the two repulsive forces of the Holm force and Lorenlz's strength. The magnitude of the current directly affects the force of Holm and the force of Lorentz.

    After switching on, the bifurcated contact 20b has a tendency to turn counterclockwise (i.e., in the ON state, the contact system will be disconnected and the ON state will break under certain current conditions) when the pressure in the electrical contact portion 204b within the upper bifurcated end 202b-1 of the bifurcated contact 20b increases and the pressure in the electrical contact portion 206b within the lower bifurcated end 202b-2 decreases under the force of electrodynamic repulsion, i.e. F1 ') F1, F2 · (F2. When the pressure in the electrical contact portion 204b inside the upper bifurcated end 202b-1 of the bifurcated contact 20b decreases and the pressure in the electrical contact portion 206b at the lower bifurcated end 202b- 2 increases, that is, F1 '(F1. F2') F2, the bifurcated contact 20b has a tendency to turn in the direction
    of the hands of the watch and the bifurcated contact 20b get stuck in the moving contact 30, and the contact system is connected stably.
    Table 1 shows the effects of the different current distribution ratios of the bifurcated contact 20b on the states of the contact system. When the current of the electrical contact portion 204b within the upper bifurcated end 202b-1 flowing through the bifurcated contact 20b is calculated to be smaller than the current flowing through the electrical contact portion 206b within the bifurcated end bottom 202b-2 of the bifurcated contact 20b, the bifurcated contact 20b and the movable contact 30 will not be separated from each other by the force of electrodynamic repulsion, thus ensuring the stable connection of the contact system.
    Table 1: the effects of the different current distribution ratios of the bifucation contact 20b on the states of the contact system
    Current Distribution: total current 1 = 8000A
    the first distribution relationship the second distribution relationshipThe third distribution relationship
    1, = 4000A 12 = 4000A 1, - = 1 1,1, = 3300A 12 = 4700A!.! = 0.70 1,1, = 4700A 12 = 3300A!.! = 1.42 1,
    the ratio of F1, F2 and F1 ', F2' F1 '> F1 F2' <F2F1 '<F1 F2'> F2F1 '> F1 F2' <F2
    Contact System Status disconnectedStably connecteddisconnected
    There are two ways to make the current flow to the electrical contact portions 204a / 204b within the upper bifurcated ends 202afb-1 of the branch contacts 20alb smaller than the current flowing to the electrical contact portions 206af206b at the ends bifurcated lower 202a-2Ib-2 of the 20a / b branch contacts. One way is that with the rotation hole 210a-1 / 210b-1 as the current entry / exit point of the bifurcated contact 20a / 20b, changing the size (such as width, height and thickness) of the two bifurcated ends 202a-1f202b-1 and 202a-2f202b-2 of the U-shaped connection body of the 20af20b bifurcation contact, so that the resistance of the upper bifurcated ends 202a-1f202b-1 may be greater than the resistance of the lower bifurcated ends 202a-21202b-2 of the bifurcated contacts 20af20b (in the illustrative bifurcated contacts shown in Figures 2 and 3, it is achieved by providing grooves 202a-1-1 / 202b-1-1 symmetrically on both sides of the upper bifurcated ends 202a-1 / 202b-1). The second way is that the electrical contact portions at both ends of the bifurcated contact 20af20b can be made with different materials that have different resistivity and different contact resistance.
    The electrodynamic repulsion force of Holm generated in the electrical contact portion within the upper bifurcated end of the bifurcated contact is less than in the electrical contact portion within the lower bifurcated end due to the current distribution function of the bifurcated contact and can be compensated partially between mr. Considering Holm's electrodynamic repulsive force (Lorentz force) of the circuit as a whole, the contact system according to the modality of the present description can be stably maintained in the ON state when a large current such as a current passes Short circuit The ability to withstand a short-lived current of the low voltage switch of the contact system according to the mode of the present description is greatly improved.
    As shown in Figure 10, when the contact system is switched on, at the contact points, the electrical contact portions within the bifurcated ends of the bifurcated contact are subjected respectively to the initial pressures F1, F2, which are perpendicular to the respective arc surfaces and are directed to the respective arc centers, and also subjected to the forces of Holm FH1, FH2 after energizing. With the initial pressures and the forces of Holm, the distance between the two bifurcated ends of the bifurcated contact (that is, the opening of the bifurcated contact) tends to increase. If the tension generated in the bifurcated contact is greater than the yield limit of the material under the initial pressures and the forces of Holm, the bifurcated contact will have an irreversible plastic deformation. The opening of the bifurcated contact gradually increases as the number of on / off actions increases. In order to increase the stiffness of the bifurcated contact, the thickness of the bifurcated contact can be increased and the height of the two bifurcated ends can be increased, or a material having a modulus of greater elasticity can be used. Due to the limitations of installation space and economic considerations, there are certain limitations to the first method to improve stiffness. When the second method is used to increase stiffness, the U-shaped connecting body 202b is designed as a three-piece combinatorial structure (for example, a three-piece welded structure) as shown in Figure 3 to satisfy the temperature rise requirement. The U-shaped connection pieces 20a-1, 20a-3 on both sides of the U-shaped connection body 202b have the same material (eg, copper), and the U-shaped connection piece 20a-2 in the center and having a uniform thickness, it is selected from a material that has a greater modulus of elasticity, for example, stainless steel.
    Figure 11 shows a schematic diagram of the contact system in the ON state according to the third mode of this description. When the contact system 10 'shown in Figure 11 is used in the low voltage internJptor 1 instead of the contact system 10 described above, the ability to withstand a short-lived current of the low voltage switch 1 can also improve greatly.
    Specifically, as shown in Figure 11, the contact system 10 'includes a bifurcated contact 60 and a mobile contact 70, wherein the bifurcated contact 60 comprises a Y-shaped connection body 602 and two electrical contacts 604 and 606 within the bifurcated ends 602-1 and 602-2 of the Y-shaped connection body 602, respectively. The bifurcated contact 60 may slide over the slide guide 90 which is substantially parallel to the lower surface of the low voltage switch 1 along the axis direction of the columnar portion of the Y-shaped connection body 602.
    As shown in Figure 11, the movable contact 70 includes a rod portion 702 and two electrical contact portions 704 and 706 that are distributed substantially symmetrically at the C-shaped end of the rod portion 702. The other Parts of the mobile contact 70 are the same as those of the modality described above (see Figures 6 and 7). The angle of the planes where the electrical contact portions 704 and 706 are located is an acute angle, to facilitate a stable connection of the bifurcated contact 60 with the movable contact 70. The slide guide support 90 of the bifurcated contact 60 is connected to the connection plate 100 by means of a thyme connection, rivet connection, welding, etc., to fix the bifurcated contact 60 to the housing of the low voltage switch 1.
    As shown in Figures 1 and 11, when the contact system 10 'shown in Figure 11 is turned on by the operating mechanism 14 in the low voltage switch 1, the movable contact 70 is turned in the opposite direction to the hands of the watch, and the electrical contact 706 of the movable contact 70 first contacts the upper bifurcated end 602-1 of the bifurcated contact 60, the bifurcated contact 60 moves to the left along the slide guide 90 by the action of the contact mobile 70, and mobile contact 70 continues to rotate counterclockwise until the electrical contact portions 704 and 706 of the mobile contact 70 in contact with the electrical contact portions 604 and 606 of the bifurcated contact 60 form a connection stable driver
    As shown in Figure 11, the execution ends of the bifurcated contact 60 and the movable contact 70 are laterally symmetrical and have a common symmetrical center in the ON state. After ignition and energization, the currents flowing to the two bifurcated ends 602-1 and 602-2 of the bifurcated contact 60 are equal, and the Holm forces acted on the two symmetrical electrical contacts 604 and 606 of the bifurcated contact 60 are of equal magnitude and symmetrical directions, so that the bifurcated contact 60 and the mobile contact 70 can be in a relatively stable connection state, thereby improving the ability to withstand a short-lived current of the low voltage switch 1.
    The present description has been described in the above modalities, but it should be understood that the modalities described above are intended to illustrate and explain only and are not intended to limit the description to the extent of the described modalities. Those skilled in the art will also understand that the present description is not limited to the modalities described above, various changes and modifications may be made in accordance with the teachings of the description that fall within the scope of the description. The scope of the description is defined by the appended claims and their equivalents.

    权利要求:
    Claims (10)
    [1]
    . A contact system in a low voltage switch comprising a bifurcated contact and a mobile contact, wherein: the bifurcated contact has an upper bifurcated end and a lower bifurcated end, where the electrical contact portions are disposed respectively inside of the upper bifurcated end and the lower bifurcated end, the electrical contact portions are disposed respectively on the upper and lower surfaces of an execution end of the mobile contact corresponding to the electrical contact portions of the bifurcated contact, when the contact system is switched on and energized, the electrodynamic repulsive forces produced in the electrical contact portions of the bifurcated contact are compensated, so that the contact system can stably maintain an ON state.
    [2]
    2. The contact system of claim 1, wherein the bifurcated contact is U-shaped or C, and when the contact system is turned on and energized, the current flowing through the upper bifurcated end is less than the current flowing through bottom forked end.
    [3]
    3. The contact system of claim 1, wherein the bifurcated contact and the electrical contact portions of the bifurcated contact form an integral structure with homogeneous material.
    [4]
    Four. The contact system of claim 1, wherein the parts of the bifurcated contact except the electrical contact portions are of a combinatorial structure with multiple connection pieces in the thickness direction or a mono-metallic structure, wherein the material of at least one of the multiple connection pieces has a modulus of elasticity greater than that of the rest of the multiple connection pieces.
    [5]
    5. The contact system of claim 1, wherein the electrical contact portions of the bifurcated contact
    or the extraction contact are of low contact resistance and are formed of electric arc resistant material.
    [6]
    6. The contact system of claim 2, wherein the bifurcated contact is disposed with a central rotation hole, the current is distributed from the central rotation hole to the upper bifurcated end and the lower bifurcated end, and the resistance of the bifurcated end upper is greater than the lower bifurcated end.
    [7]
    7. The contact system of claim 1, wherein all or part of the surfaces of the electrical contact portions of the upper bifurcated end and the lower bifurcated end facing each other are arc surfaces, arc surfaces are used for electrical contact and to make space in the process of connecting or disconnecting the bifurcated contact with the mobile contact.
    [8]
    8. The contact system of claim 1, wherein the bifurcated contact is in the form of Y or V, when the contact system is turned on and energized, the current flowing through the upper bifurcated end is equal to the current flowing through the lower bifurcated end.
    [9]
    9. The contact system of claim 2 or 8, wherein the bifurcated contact is provided with a restoration structure to restore the bifurcated contact with the aid of a spring or restoration clips after the bifurcated contact is disconnected with the removable contact .
    [10]
    10. A low voltage switch comprising an arc extinguishing chamber, an operating mechanism and a contact system of any one of claims 1-9.
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    同族专利:
    公开号 | 公开日
    TR201800056T1|2018-03-21|
    US20180182567A1|2018-06-28|
    ES2659083R1|2018-04-11|
    CN105047443A|2015-11-11|
    AU2015404969B2|2018-08-02|
    AU2015404969A1|2018-01-18|
    ES2659083B2|2018-11-30|
    SG11201710581PA|2018-01-30|
    SA517390646B1|2021-03-16|
    WO2017020439A1|2017-02-09|
    CN105047443B|2018-04-27|
    BR112017027849A2|2018-11-06|
    CA2990330C|2020-07-21|
    CA2990330A1|2017-02-09|
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    FR2703824B1|1993-04-07|1995-05-12|Merlin Gerin|Multipolar limiter circuit breaker with electrodynamic repulsion.|
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    CN201510478109.0A|CN105047443B|2015-08-06|2015-08-06|Contact system and low tension switch in low tension switch|
    CN201510478109.0|2015-08-06|
    WOPCT/CN2015/093893|2015-11-05|
    WO15093893CN|2015-11-05|
    PCT/CN2015/093893|WO2017020439A1|2015-08-06|2015-11-05|Contact system in low-voltage switch, and low-voltage switch|
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