A switching device

Abstract

This utility model discloses a switching device, relating to the field of contactor and relay technology. The switching device includes: a ceramic cover, a movable bracket disposed on the inner side of the ceramic cover, an active contact piece disposed on the movable bracket, an active contact at each end of the active contact piece, and two main stationary contacts passing through the top surface of the ceramic cover; a base, an auxiliary moving spring disposed at each end of the base in a second direction, and an auxiliary moving contact at the end of the auxiliary moving spring; a first plate, two first protrusions symmetrically disposed at each end of the first plate in a second direction, forming a first groove between the two first protrusions; and a second plate, with a creepage gap between the second plate and the first plate. The above-mentioned switching device solves the technical problem of existing switching devices, which, due to limited assembly space and insufficient creepage insulation capacity of the base, are prone to breakdown of the main circuit and auxiliary terminals under high voltage.

Description

Technical Field

[0001] This utility model relates to the field of contactor and relay technology, and in particular to a switching device. Background Technology

[0002] As market demand continues to increase, products in the switchgear industry are also constantly being innovated and upgraded, especially contactors and relays, which still have many shortcomings and need further development and improvement.

[0003] On the one hand, the existing switchgear structure design is unreasonable. At the moment of contact between the active contact and the main stationary contact, a rigid collision may occur, affecting the service life of the switchgear. On the other hand, due to the small assembly space, the existing switchgear has insufficient creepage insulation capacity, making it prone to breakdown of the main circuit and auxiliary terminals under high voltage. Therefore, an insulating base and switchgear designed to solve the above problems are proposed. Utility Model Content

[0004] The purpose of this utility model is to provide a switching device that solves the technical problem that existing switching devices are prone to breakdown of the main circuit and auxiliary terminals under high voltage due to insufficient creepage insulation of the substrate and small assembly space.

[0005] To achieve the above objectives, this utility model provides a switching device, comprising:

[0006] A ceramic cover has a movable support on its inner side and a support spring on its top surface. The upper end of the support spring is connected to an active contact piece, and each of the two ends of the active contact piece is provided with an active contact. Two main stationary contacts are passed through the top surface of the ceramic cover, and the two main stationary contacts are located directly below each of the active contacts. The movable support can be driven to reciprocate along a first direction to control the contact and separation of the active contact and the main stationary contact.

[0007] A base is disposed above the active contact piece. An auxiliary moving spring is provided at each of the two ends of the base in the second direction. An auxiliary moving contact is provided at the end of the auxiliary moving spring. The second direction is perpendicular to the first direction.

[0008] A first plate is disposed on the bottom surface of the base. Two first protrusions are symmetrically provided at both ends of the first plate in the second direction. A first groove is formed between the two first protrusions. The first groove is located directly below the auxiliary moving contact.

[0009] The second plate is disposed on the bottom surface of the first plate, and a creepage gap is provided between the second plate and the first plate.

[0010] Preferably, the top surface of the ceramic cover is provided with two lead terminals, and the lower ends of the two lead terminals are respectively provided with auxiliary stationary contacts, and the two auxiliary stationary contacts are respectively located above the corresponding auxiliary moving contacts.

[0011] Preferably, two connecting brackets are symmetrically arranged on the top surface of the movable bracket, and an insertion hole is provided on the upper part of the connecting bracket. An insulating pad is provided on the top surface of the active contact piece, and positioning protrusions are provided at both ends of the insulating pad in the second direction. The positioning protrusions are inserted into the insertion hole.

[0012] Preferably, the bottom surface of the active contact piece is provided with an insulating limiting plate, the insulating limiting plate being U-shaped in general, and the active contact piece being snapped into the top surface of the insulating limiting plate.

[0013] Preferably, the inner side of the ceramic cover is provided with two inner protrusions on both sides in the first direction, and the four inner protrusions are respectively located on both sides of the first plate in the second direction, and the four inner protrusions divide the internal space of the ceramic cover into an end space and a middle space.

[0014] Preferably, the first plate is provided with a second protruding edge at both ends in the first direction, and the second plate is provided with a third protruding edge at both ends in the first direction, and the creepage gap is formed between the second protruding edge and the third protruding edge.

[0015] Preferably, the second plate has two fourth protrusions symmetrically arranged at both ends in the second direction, and a second groove is formed between the two fourth protrusions, with the second groove located directly below the first groove.

[0016] Preferably, the inner side of the second groove protrudes beyond the inner side of the first groove in the first direction and the second direction, respectively.

[0017] Preferably, the width of the first groove in the first direction is greater than the width of the auxiliary moving contact in the first direction.

[0018] Preferably, two auxiliary moving springs are integrally formed at both ends of the base, and the two auxiliary moving springs are embedded inside the base.

[0019] Compared to the aforementioned background technology, the switchgear provided by this utility model has the following beneficial effects: By providing elastic support to the active contact piece via a support spring, when the active contact abuts against the main stationary contact, the support spring will be compressed and contracted to a certain length to avoid rigid collision between the active contact and the main stationary contact, thus protecting both the active and main stationary contacts and extending the overall service life of the switchgear. Furthermore, by increasing the creepage distance through the sequential arrangement of a first plate and a second plate on the bottom surface of the base, and by creating a creepage gap between the first and second plates to form a creepage space, the creepage distance is further increased. Under effective assembly space conditions, the creepage insulation capability of the insulating base is significantly increased, thereby preventing the main circuit and auxiliary terminals of the switchgear from being broken down under high voltage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 A three-dimensional structural diagram of the switching device provided in the embodiment of this utility model;

[0022] Figure 2 This is a cross-sectional view of the switching device provided in an embodiment of the present utility model from a first angle.

[0023] Figure 3 This is a cross-sectional view of the switching device provided in an embodiment of the present utility model from a second angle.

[0024] Figure 4 A three-dimensional structural diagram of the insulating base provided in an embodiment of this utility model;

[0025] Figure 5 A top view of the insulating base provided in an embodiment of this utility model;

[0026] Figure 6 A cross-sectional schematic diagram of the insulating base provided in an embodiment of this utility model;

[0027] Figure 7 A perspective view of the insulating base provided in the second embodiment of this utility model;

[0028] Figure 8 A perspective view of the insulating base provided in the third embodiment of this utility model;

[0029] Figure 9This is a perspective view of the insulating base provided in the fourth embodiment of the present utility model;

[0030] Figure 10 This is a perspective view of the insulating base provided in the fifth embodiment of the present utility model;

[0031] Figure 11 This is a cross-sectional view of the switching device provided in an embodiment of the present utility model from a third angle.

[0032] Figure 12 This is an assembly diagram of the movable support and insulating base provided in an embodiment of the present utility model;

[0033] Figure 13 An exploded view of the movable support and insulating base provided in an embodiment of this utility model;

[0034] Figure 14 An exploded view of the movable support and insulating base provided in an embodiment of this utility model from another angle;

[0035] Figure 15 for Figure 2 Enlarged view of point A in the middle;

[0036] Figure 16 for Figure 3 Enlarged diagram of point B in the middle.

[0037] Specifically, 1-Ceramic cover; 101-Inner protrusion; 102-End space; 103-Middle space; 104-Assembly hole; 2-Moving bracket; 201-Support spring; 202-First limiting groove; 3-Active contact piece; 301-Second limiting groove; 302-First assembly groove; 303-Limiting protrusion; 304-Active contact; 4-Main stationary contact; 5-Electromagnetic system; 501-Push-pull rod; 6-Insulating gasket; 601-Positioning protrusion; 7-Insulating base; 701-Base; 702-Auxiliary 703-Moving spring; 704-Auxiliary moving contact; 705-Second assembly groove; 705-First plate; 7051-First protruding edge; 7052-First groove; 706-Second plate; 7061-Second protruding edge; 7062-Third protruding edge; 7063-Creep clearance; 7064-Fourth protruding edge; 7065-Second groove; 8-Rivet; 801-Mounting plate; 9-Lead terminal; 901-Auxiliary stationary contact; 10-Connecting bracket; 1001-Socket; 11-Insulating limiting plate; 1101-Through hole. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, to achieve the above objectives, this utility model provides a switching device, including: a ceramic cover 1 and an insulating base 7, wherein a sealed cavity is formed on the inner side of the ceramic cover 1, a movable bracket 2 is disposed within the sealed cavity, a support spring 201 is disposed on the top surface of the movable bracket 2, the upper end of the support spring 201 is connected to an active contact piece 3, an active contact 304 is disposed at each of the two ends of the active contact piece 3, two main stationary contacts 4 are disposed on the top surface of the ceramic cover 1, and the two active contacts 304 are respectively located directly above one of the main stationary contacts 4, the movable bracket 2 can be driven to reciprocate along a first direction, the first direction being the auxiliary direction. Figure 1 The X direction is used to control the contact and separation of the active contact 304 and the main stationary contact 4. The active contact 3 is elastically supported by the support spring 201. When the active contact 304 abuts against the main stationary contact 4, the support spring 201 will be compressed and contracted to a certain length to avoid rigid collision between the active contact 304 and the main stationary contact 4, thereby protecting the active contact 304 and the main stationary contact 4 and extending the service life of the overall switchgear.

[0041] A base 701 is disposed above the active contact 3. The base 701 is made of a conductive material, optionally copper, and is mainly used to connect the auxiliary circuit. A first plate 705 is disposed on the bottom surface of the base 701, and a second plate 706 is disposed on the bottom surface of the first plate 705. Both the first plate 705 and the second plate 706 are non-conductive plastic parts. The creepage distance is increased by the sequential placement of the first plate 705 and the second plate 706 on the bottom surface of the base 701. In addition, a creepage gap 7063 is provided between the second plate 706 and the first plate 705. It should be noted that the creepage gap 7063 does not completely block the arc, but forms a creepage space and increases the creepage distance. Under effective assembly space conditions, the creepage insulation capability of the insulating base 7 is significantly increased, thereby avoiding the phenomenon of breakdown of the main circuit and auxiliary terminal of the switching device under high voltage.

[0042] The base 701 is provided with auxiliary movable springs 702 at both ends in the second direction, wherein the second direction is an auxiliary... Figure 1 In the Y direction, the second direction is perpendicular to the first direction. The end of the auxiliary moving spring 702 is provided with an auxiliary moving contact 703. At the same time, two first protruding edges 7051 are symmetrically provided at both ends of the first plate 705 in the second direction. The outer side of the first protruding edge 7051a extends beyond the auxiliary moving contact 703. A first groove 7052 is formed between the two first protruding edges 7051. The first groove 7052 is located directly below the auxiliary moving contact 703. When the auxiliary moving contact 703 abuts and engages with the auxiliary stationary contact 901, due to the elasticity of the auxiliary spring, the auxiliary moving contact 703 will move a certain distance closer to the first plate 705. The first groove 7052 provides a certain clearance space for the auxiliary moving contact 703 and can effectively reduce the distance between the auxiliary moving spring 702 and the first plate 705, thereby reducing the longitudinal dimension of the insulating base 7, which is also the dimension in the Z direction. On the other hand, the first groove 7052 enables the riveting of the riveting point on the lower side of the auxiliary moving contact 703, making it convenient to weld the auxiliary moving contact 703 onto the auxiliary moving spring 702.

[0043] In some embodiments of this utility model, two lead terminals 9 are provided on the top surface of the ceramic cover 1, and auxiliary stationary contacts 901 are respectively provided at the lower ends of the two lead terminals 9. The two auxiliary stationary contacts 901 are respectively located above the corresponding auxiliary moving contacts 703. When the circuit is connected, the control electromagnetic system 5 drives the push-pull rod 501 to move the movable bracket 2 along a third direction towards the main stationary contact piece. Before the active contact 304 abuts against the main stationary contact 4, the auxiliary moving contact 703 first contacts the auxiliary stationary contact 901 to connect the capacitive load. The control electromagnetic system 5 continues to drive the push-pull rod 501 to move the movable bracket 2 along a third direction towards the main stationary contact piece until the main contact piece abuts against the stationary contact piece to connect to the main circuit. This allows the auxiliary contact piece assembly to connect the capacitive load first, resolving the influence of the capacitive load and ensuring that it does not affect the contact resistance after the main contact piece is connected to the main circuit, effectively increasing the stability of the contact resistance. The third direction is the auxiliary... Figure 1 In the Z direction, the third direction is perpendicular to the second and first directions, respectively.

[0044] In some embodiments of this utility model, two connecting brackets 10 are symmetrically arranged on the top surface of the movable bracket 2. An insertion hole 1001 is provided on the upper part of the connecting bracket 10. An insulating pad 6 is provided on the top surface of the active contact piece 3. Positioning protrusions 601 are provided at both ends of the insulating pad 6 in the second direction. The positioning protrusions 601 are inserted into the insertion hole 1001. The insulating pad 6 is fixed by the two connecting brackets 10. With the support spring 201 supporting the active contact piece 3, the insulating pad 6 is stably fixed on the top surface of the active contact piece 3.

[0045] In addition, the top surface of the insulating gasket 6 is provided with an assembly hole 104, and a rivet 8 is inserted into the assembly hole 104. An mounting plate 801 is sleeved on the outer peripheral side of the upper end of the rivet 8. The top surface of the active contact piece 3 is provided with a first assembly groove 302 for accommodating the lower end of the rivet 8. The top surface of the base 701 is provided with a second assembly groove 704 for accommodating the mounting plate 801. The bottom surface of the mounting plate 801 is attached to the bottom surface of the second assembly groove 704, and the mounting plate 801 is fixed in the second assembly groove 704 by screws, thereby fixing the base 701 to the top surface of the insulating gasket 6.

[0046] It should be noted that the bottom surface of the active contact 3 is provided with a limiting protrusion 303, and the top surface of the movable bracket 2 is provided with a first limiting groove 202. The limiting protrusion 303 is snapped into the upper end of the support spring 201, and the first limiting groove 202 is snapped into the lower end of the support spring 201. The design of the limiting protrusion 303 and the first limiting groove 202 can stably limit the two ends of the support spring 201 to ensure the stability of the active contact 3 when it reciprocates along a third direction, thereby ensuring that the switching device can stably control the circuit to turn on or off.

[0047] Optionally, an insulating limiting plate 11 is provided on the bottom surface of the active contact 3. The insulating limiting plate 11 is U-shaped, and the active contact 3 is snapped into the top surface of the insulating limiting plate 11. At the same time, a through hole 1101 is provided on the bottom surface of the insulating limiting plate 11. The through hole 1101 is used to pass through the support spring 201. The through hole 1101 and the limiting protrusion 303 combine to form a second limiting groove 301. The upper end of the support spring 201 is stably snapped into the second limiting groove 301. At the same time, through the cooperation of the insulating limiting plate 11 and the insulating gasket 6, the active contact 3 can be isolated from other components, which can protect the overall switching device.

[0048] In some embodiments of this utility model, two inner protrusions 101 are respectively provided on both sides of the inner side of the ceramic cover 1 in the first direction, and the four inner protrusions 101 are respectively located on both sides of the first plate 705 in the second direction. The four inner protrusions 101 divide the internal space of the ceramic cover 1 into an end space 102 and a middle space 103. The end space 102 is the active contact arc ignition and arc extinguishing space, and the middle space 103 is the arc creepage space of the auxiliary moving contact 703. By separating the active contact arc ignition space and the auxiliary moving contact 703 arc creepage space, the high voltage and current of the end space 102 can be effectively prevented from damaging the low voltage of the middle space 103 through creepage.

[0049] In some embodiments of this utility model, the first plate 705 is provided with a second protruding edge 7061 at both ends in the first direction, and the second plate 706 is provided with a third protruding edge 7062 at both ends in the first direction. A creepage gap 7063 is formed between the second protruding edge 7061 and the third protruding edge 7062. The creepage gap 7063 is close to the substrate 701, which can maximize the creepage distance under limited longitudinal dimensions.

[0050] In the second embodiment of this utility model, the second plate 706 is provided with two fourth protrusions 7064 symmetrically at both ends in the second direction, and a second groove 7065 is formed between the two fourth protrusions 7064. The second groove 7065 is located directly below the first groove 7052, and the inner side of the first groove 7052 and the inner side of the second groove 7065 are on the same vertical line. The second groove 7065 can cooperate with the first groove 7052 to rivet the auxiliary moving contact 703.

[0051] In the third embodiment of this utility model, the inner side of the second groove 7065 protrudes from the inner side of the first groove 7052 in the first direction and the second direction, respectively. The inner side of the second groove 7065 is further outward than the inner side of the first groove 7052. By sacrificing a certain amount of riveting space, the creepage distance of the second plate 706 is further increased.

[0052] In the fourth embodiment of this utility model, the width D1 of the first groove 7052 in the second direction is greater than the width D2 of the auxiliary moving contact 703 in the second direction. When the movable bracket 2 is driven to reciprocate along the third direction to control the contact and separation of the active contact 304 and the main stationary contact 4, the auxiliary moving contact can enter the first groove 7052 to ensure that the first groove 7052 provides clearance space for the auxiliary moving contact 703, allowing the auxiliary moving contact 703 to move up and down smoothly within the first groove 7052. While reducing the distance between the auxiliary moving spring 702 and the first plate 705, sufficient movement space is ensured for the auxiliary moving contact along the third direction, effectively reducing the longitudinal dimension of the insulating base 7.

[0053] In the fifth embodiment of this utility model, when the second plate 706 is assembled after the auxiliary moving contact 703 is riveted, or when the riveting point between the auxiliary moving contact 703 and the auxiliary moving spring 702 is not on the lower side of the auxiliary moving contact 703, the second plate 706 may be provided without the second groove 7065.

[0054] In some embodiments of this utility model, the length of the second plate 706 in the second direction is less than the length of the first plate 705 in the first second direction. After the first plate 705 and the second plate 706 are assembled, the whole is inverted trapezoidal. Of course, the length of the second plate 706 in the second direction can also be the same as the length of the first plate 705 in the second direction. Its main purpose is to adapt to the shape of the movable bracket 2 in the switchgear, so that the insulating base 7 can be stably installed on the movable bracket 2 in the switchgear.

[0055] In summary, by sequentially arranging the first plate 705 and the second plate 706 on the bottom surface of the base 701 to increase the creepage distance, and simultaneously setting a creepage gap 7063 between the first plate 705 and the second plate 706 to form a creepage space, the creepage distance is further increased. Under effective assembly space conditions, the creepage insulation capability of the insulating base 7 is significantly increased, thereby preventing the main circuit and auxiliary terminals of the switchgear from being broken down under high voltage.

[0056] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0057] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A switchgear, characterized by comprising: include: A ceramic cover has a movable support on its inner side and a support spring on its top surface. The upper end of the support spring is connected to an active contact piece, and each of the two ends of the active contact piece is provided with an active contact. Two main stationary contacts are passed through the top surface of the ceramic cover, and the two main stationary contacts are located directly below each of the active contacts. The movable support can be driven to reciprocate along a first direction to control the contact and separation of the active contact and the main stationary contact. A base is disposed above the active contact piece. An auxiliary moving spring is provided at each of the two ends of the base in the second direction. An auxiliary moving contact is provided at the end of the auxiliary moving spring. The second direction is perpendicular to the first direction. A first plate is disposed on the bottom surface of the base. Two first protrusions are symmetrically provided at both ends of the first plate in the second direction. A first groove is formed between the two first protrusions. The first groove is located directly below the auxiliary moving contact. The second plate is disposed on the bottom surface of the first plate, and a creepage gap is provided between the second plate and the first plate.

2. A switchgear according to claim 1, characterized in that The top surface of the ceramic cover is provided with two lead terminals, and the lower ends of the two lead terminals are respectively provided with auxiliary stationary contacts, which are located above the corresponding auxiliary moving contacts.

3. A switchgear according to claim 1, characterized in that Two connecting brackets are symmetrically arranged on the top surface of the movable bracket. An insertion hole is provided on the upper part of the connecting bracket. An insulating pad is provided on the top surface of the active contact piece. Positioning protrusions are provided at both ends of the insulating pad in the second direction. The positioning protrusions are inserted into the insertion hole.

4. A switchgear according to claim 3, characterised in that An insulating limiting plate is provided on the bottom surface of the active contact piece. The insulating limiting plate is U-shaped, and the active contact piece is snapped into the top surface of the insulating limiting plate.

5. A switchgear according to claim 1, characterized in that The ceramic cover has two inner protrusions on each side of the first direction, and the four inner protrusions are located on both sides of the first plate in the second direction. The four inner protrusions divide the internal space of the ceramic cover into an end space and a middle space.

6. A switching device according to any one of claims 1-5, characterized in that, The first plate has a second protruding edge at each end in the first direction, and the second plate has a third protruding edge at each end in the first direction, forming the creepage gap between the second protruding edge and the third protruding edge.

7. A switchgear according to claim 6, characterised in that The second plate has two fourth protrusions symmetrically arranged at its two ends in the second direction, and a second groove is formed between the two fourth protrusions. The second groove is located directly below the first groove.

8. A switching device according to claim 7, characterized in that, The inner side of the second groove protrudes from the inner side of the first groove in the first direction and the second direction, respectively.

9. A switchgear according to any of claims 1-5, characterized in that The width of the first groove in the first direction is greater than the width of the auxiliary moving contact in the first direction.

10. A switchgear according to any of claims 1-5, characterized in that Two auxiliary moving springs are integrally formed at both ends of the base, and the two auxiliary moving springs are embedded inside the base.

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