Moving contact assembly and switch unit for isolating switch

Abstract

The utility model provides a moving contact assembly and a switch unit for an isolating switch, and relates to the technical field of low-voltage electric appliances. The moving contact assembly comprises a contact support, a moving contact and a permanent magnet, the moving contact and the permanent magnet are arranged on the contact support, the permanent magnet is used for extinguishing electric arcs generated when the moving contact is separated from a static contact, and the magnetic pole direction of the permanent magnet is perpendicular to the rotation axis of the contact support. According to the moving contact assembly, the permanent magnet is arranged on the contact support, and the magnetic pole direction of the permanent magnet is limited to be perpendicular to the rotation axis of the contact support, so that a non-polar magnetic field is formed near the contact support, the arc extinguishing effect is good, the cost is low, and the use range and the use mode of the disconnecting switch cannot be limited.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and more specifically, to a moving contact assembly and a switch unit for an isolating switch. Background Art

[0002] An isolating switch is used to disconnect or close an electric current circuit in an energized state, and has two functions of switching and isolation. It is a safe, reliable, practical and economical low-voltage switch electrical appliance. An isolating switch generally consists of one or more contact modules, and each contact module includes a rotating moving contact bracket, and a set of moving contacts and static contacts for connecting and disconnecting the current. When the moving contact is separated from the static contact, an arc will be generated. The arc will not only burn the moving and static contacts, but also increase the breaking time of the isolating switch, affecting the entire power distribution system.

[0003] Permanent magnet arc extinguishing is an arc extinguishing solution often adopted in the prior art. A permanent magnet is arranged on the moving contact assembly so that it rotates with the moving contact assembly to extinguish the arc. However, for the existing permanent magnet arranged on the moving contact assembly, the formed magnetic field has polarity, which will limit the use range and use method of the isolating switch. And if non-polar magnetic field is to be achieved, multiple permanent magnets need to be arranged on the housing and the arc extinguishing chamber as well, which will significantly increase the cost. Summary of the Utility Model

[0004] The purpose of the present application is to provide, in view of the above-mentioned deficiencies in the prior art, a moving contact assembly and a switch unit for an isolating switch, which can form a non-polar magnetic field, have good arc extinguishing effect, low cost and will not limit the use range and use method of the isolating switch.

[0005] To achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

[0006] On the one hand, an embodiment of the present application provides a moving contact assembly, including: a contact bracket, a moving contact and a permanent magnet arranged on the contact bracket. The permanent magnet is used to extinguish the arc generated when the moving contact is separated from the static contact, and the magnetic pole direction of the permanent magnet is perpendicular to the rotation axis of the contact bracket.

[0007] Optionally, the orthographic projection of the permanent magnet on the projection plane of the contact bracket is separated from the orthographic projection of the moving contact on the projection plane.

[0008] Optionally, the permanent magnet is located on one side of the starting arc area provided on the moving contact.

[0009] Optionally, the center of the moving contact is located on the rotation axis of the contact bracket. The two opposite ends of the moving contact are respectively used to cooperate with two static contacts. The number of permanent magnets is an even number, and half of the permanent magnets are located on one side of the moving contact, and the other half of the permanent magnets are located on the opposite side of the moving contact.

[0010] Optionally, the contact support includes a base and an upper cover that mates with the base, and the moving contact and the permanent magnet are clamped and fixed between the base and the upper cover.

[0011] Optionally, a magnet groove is provided on the base, the permanent magnet is placed in the magnet groove, and after the upper cover is connected to the base in a mating manner, the notch of the magnet groove is closed so that the permanent magnet is clamped and fixed between the base and the upper cover.

[0012] On the other hand, an embodiment of the present application provides a switch unit for a disconnector, including a housing, a static contact disposed in the housing, and a moving contact assembly as described in any one of the above, and the static contact cooperates with the moving contact of the moving contact assembly.

[0013] Optionally, an arc extinguishing chamber is further provided in the housing. An arc extinguishing channel is provided on the side of the arc extinguishing chamber facing the moving contact assembly, and the arc extinguishing channel is used for the arcing area of the moving contact to pass through during opening and closing. Among them, the arcing area is the area where an arc is generated when the moving contact separates from the static contact.

[0014] Optionally, the side of the arc extinguishing chamber facing the moving contact assembly is spaced from the peripheral wall of the contact support of the moving contact assembly by a preset distance, and the preset distance is 0 mm to 0.2 mm.

[0015] Optionally, the switch units for the disconnector can be stacked along a preset direction, the preset direction is parallel to the rotation axis of the contact support in the moving contact assembly, and the contact supports in multiple switch units are linked.

[0016] The beneficial effects of the present application include:

[0017] The present application provides a moving contact assembly, including: a contact support, a moving contact disposed on the contact support, and a permanent magnet. The permanent magnet is used to extinguish the arc generated when the moving contact separates from the static contact, and the magnetic pole direction of the permanent magnet is perpendicular to the rotation axis of the contact support. By arranging the permanent magnet on the contact support and limiting the magnetic pole direction of the permanent magnet to be perpendicular to the rotation axis of the contact support, a non-polar magnetic field is formed near the contact support, and the arc extinguishing effect is good, the cost is low, and it does not limit the use range and use method of the disconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 FIG. 1 is one of the structural schematic diagrams of the moving contact assembly provided by the embodiment of the present application;

[0020] Figure 2 This is the second structural schematic diagram of the moving contact assembly provided by the embodiment of the present application;

[0021] Figure 3 This is the third structural schematic diagram of the moving contact assembly provided by the embodiment of the present application;

[0022] Figure 4 This is the fourth structural schematic diagram of the moving contact assembly provided by the embodiment of the present application;

[0023] Figure 5 This is the first structural schematic diagram of the switch unit for the disconnector provided by the embodiment of the present application;

[0024] Figure 6 This is the fifth structural schematic diagram of the moving contact assembly provided by the embodiment of the present application;

[0025] Figure 7 This is the second structural schematic diagram of the switch unit for the disconnector provided by the embodiment of the present application;

[0026] Figure 8 This is the third structural schematic diagram of the switch unit for the disconnector provided by the embodiment of the present application.

[0027] Icon: 100 - moving contact assembly; 110 - contact support; 111 - rotation axis; 112 - projection plane; 113 - base; 1131 - card slot; 114 - upper cover; 1141 - buckle; 120 - moving contact; 121 - arcing area; 130 - permanent magnet; 300 - switch unit for disconnector; 310 - housing; 320 - static contact; 330 - arc extinguishing chamber; 331 - arc extinguishing channel; 332 - grid sheet; A - magnetic pole direction; B - preset direction. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. It should be noted that, without conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the protection scope of the present application.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0032] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] Permanent magnet arc extinguishing is an arc extinguishing solution often adopted in the prior art. A permanent magnet is arranged on the moving contact assembly to rotate with the moving contact assembly and extinguish the arc. However, for the permanent magnet arranged on the moving contact assembly in the prior art, the formed magnetic field has polarity. Different positive and negative wiring of the incoming power supply will lead to different arc extinguishing effects, and further limit the usage range and usage method of the disconnecting switch. And if a non-polar magnetic field is to be achieved, multiple permanent magnets need to be arranged on the housing and the arc extinguishing chamber as well, which will significantly increase the cost.

[0034] To solve the above technical problems, on the one hand of the embodiments of the present application, please refer to Figure 1 and Figure 2 , a moving contact assembly 100 is provided, which includes: a contact support 110, a moving contact 120 arranged on the contact support 110, and a permanent magnet 130. The permanent magnet 130 is used to extinguish the arc generated when the moving contact 120 separates from the static contact 320, and the magnetic pole direction A of the permanent magnet 130 is perpendicular to the rotation axis 111 of the contact support 110.

[0035] The contact support 110 of the moving contact assembly 100 rotates around its rotation axis 111 after being driven, driving the moving contact 120 to contact and close or separate and open with the static contact 320. At the same time, it also drives the permanent magnet 130 to move together. The permanent magnet 130 has opposite N and S poles. The direction from the N pole to the S pole, or from the S pole to the N pole, is the magnetic pole direction A of the permanent magnet 130. It can be understood that the magnetic pole direction A is perpendicular to the magnetization surfaces on the permanent magnet 130 where the N and S poles are formed respectively.

[0036] The magnetic pole direction A of the permanent magnet 130 is perpendicular to the rotation axis 111 of the contact support 110. At this time, the direction of the magnetic blow force is parallel to the rotation axis 111 of the contact support 110. The magnetic field formed by the permanent magnet 130 near the contact support 110 is non-polar. Different positive and negative wiring of the incoming power supply will not result in different arc extinguishing effects. Therefore, it will not limit the usage range and usage method of the disconnecting switch. Compared with the prior art where the permanent magnet forms a polar magnetic field near the contact support, in this application, there is no need to set the permanent magnet 130 at other positions such as the housing and the arc extinguishing chamber to change the polarity of the magnetic field. Therefore, the cost can be greatly saved. In addition, the permanent magnet 130 moves with the contact support 110, and the magnetic field generated by the permanent magnet 130 can continuously guide the arc to move and cool and stretch the arc. Therefore, the arc extinguishing effect is better, and there is no need to set too many permanent magnets 130 on the contact support 110, which can further save costs.

[0037] It should be noted that when the permanent magnet 130 on the contact support 110 in this embodiment is installed, the polarity is not distinguished. It can be that the N pole is close to the rotation axis 111 of the contact support 110 and the S pole is far from the rotation axis 111 of the contact support 110, or the S pole is close to the rotation axis 111 of the contact support 110 and the N pole is far from the rotation axis 111 of the contact support 110.

[0038] In summary, for the moving contact assembly 100 provided in the embodiment of this application, by setting the permanent magnet 130 on the contact support 110 and defining the magnetic pole direction A of the permanent magnet 130 to be perpendicular to the rotation axis 111 of the contact support 110, a non-polar magnetic field is formed near the contact support 110, with good arc extinguishing effect, low cost and no limitation on the usage range and usage method of the disconnecting switch.

[0039] Optionally, please refer to Figure 1 , the orthographic projection of the permanent magnet 130 on the projection plane 112 of the contact support 110 is separated from the orthographic projection of the moving contact 120 on the projection plane 112.

[0040] It should be noted that the projection direction of the orthographic projection is parallel to the rotation axis 111 of the contact support 110. The projection plane 112 is a plane where any surface of the contact support 110 perpendicular to the rotation axis 111 is located or a virtual plane inside the contact support 110 perpendicular to the rotation axis 111.

[0041] The orthographic projections of the permanent magnet 130 and the moving contact 120 on the projection plane 112 are separated from each other without an overlapping area, which can further improve the arc extinguishing effect and also facilitate the installation of the permanent magnet 130 and the moving contact 120.

[0042] Optionally, the permanent magnet 130 is located on one side of the moving contact 120 where the arcing area 121 is provided.

[0043] The moving contact 120 is provided with an arcing area 121, and the arcing area 121 is the position where an arc is generated at the moment when the moving contact 120 separates from the static contact 320. The permanent magnet 130 is located on one side of the moving contact 120 where the arcing area 121 is provided, so as to facilitate extinguishing or guiding the arc generated during opening.

[0044] The orthographic projection of the moving contact 120 on the projection plane 112 of the contact support 110 divides the orthographic projection of the contact support 110 on the projection plane 112 into two projection areas, and the two projection areas are respectively located on opposite sides of the moving contact 120. The orthographic projection of the permanent magnet 130 on the projection plane is located on one of the projection areas, and this projection area is closer to the arcing area 121 on the moving contact 120 corresponding to this permanent magnet 130 than the other projection area. As for the position of the permanent magnet 130 in this projection area, this embodiment does not make a limitation. As Figure 1 shown, the permanent magnet 130 can be located at the middle position of this projection area. As Figure 3 shown, the permanent magnet 130 can also be located at a position in this projection area that is farther from the arcing area 121 than the middle position. As Figure 4 shown, the permanent magnet 130 can also be located at a position in this projection area that is closer to the arcing area 121 than the middle position.

[0045] Optionally, please refer to Figure 1 and Figure 5 , the center of the moving contact 120 is located on the rotation axis 111 of the contact support 110. The opposite ends of the moving contact 120 are respectively used to cooperate with two static contacts 320. The number of permanent magnets 130 is an even number, and half of the permanent magnets 130 are located on one side of the moving contact 120, and the other half of the permanent magnets 130 are located on the opposite side of the moving contact 120. The permanent magnets 130 on both sides of the moving contact 120 are respectively used to extinguish the arcs generated at both ends of the moving contact 120.

[0046] Preferably, the permanent magnets 130 on both sides of the moving contact 120 are symmetrically distributed with respect to the rotation axis 111 of the contact support 110, so that the arc extinguishing effects on both sides of the moving contact 120 are the same, which is also convenient for processing and installation.

[0047] Optionally, please refer to Figure 1 and Figure 2 , the contact support 110 includes a base 113 and an upper cover 114 that cooperates with the base 113, and the moving contact 120 and the permanent magnets 130 are clamped and fixed between the base 113 and the upper cover 114.

[0048] After the base 113 and the upper cover 114 are combined, a receiving space is formed between them, and both the moving contact 120 and the permanent magnets 130 are clamped and fixed in this receiving space.

[0049] Optionally, a magnet groove is provided on the base 113, the permanent magnet 130 is placed in the magnet groove, and after the upper cover 114 is cooperatively connected with the base 113, the notch of the magnet groove is closed to clamp and fix the permanent magnet 130 between the base 113 and the upper cover 114.

[0050] Exemplarily, please refer to Figure 6 , a clamping groove 1131 is provided on the base 113, a clamping buckle 1141 is provided on the upper cover 114, and after the clamping buckle 1141 is snapped into the clamping groove 1131, it is fixed to connect the upper cover 114 and the base 113.

[0051] This embodiment also provides a switch unit 300 for a disconnector. Please refer to Figure 5 and Figure 7 , which includes a housing 310, a static contact 320 arranged in the housing 310, and a moving contact assembly 100 as described in any one of the above, and the static contact 320 cooperates with the moving contact 120 of the moving contact assembly 100.

[0052] The switch unit 300 for the disconnector has the same structure and beneficial effects as the moving contact assembly 100 in the foregoing embodiment. The structure and beneficial effects of the moving contact assembly 100 have been described in detail in the foregoing embodiment and will not be elaborated herein.

[0053] The arc extinguishing effect of the permanent magnet 130 is excellent under small current conditions, but the effect is not obvious under large current conditions, and it is easy to spray arc and cause contact burnout. To improve the arc extinguishing effect under large current conditions, optionally, please refer to Figure 5 and Figure 8, the switching unit 300 for the disconnecting switch further includes an arc extinguishing chamber 330 disposed within the housing 310. An arc extinguishing passage 331 is provided on the side of the arc extinguishing chamber 330 facing the moving contact assembly 100. The arc extinguishing passage 331 is used for the arcing area 121 of the moving contact 120 to pass through during opening and closing. Among them, the arcing area 121 is the area where an arc is generated when the moving contact 120 separates from the static contact 320.

[0054] The permanent magnet 130 is used to extinguish the arc of small current, and the arc extinguishing chamber 330 is used to extinguish the arc of large current. The arc extinguishing chamber 330 uses grid plates 332 for arc extinguishing, and its structure is a prior art and will not be elaborated in this embodiment. When the arc current is relatively large, the arc follows the moving contact 120 into the arc extinguishing passage 331 of the arc extinguishing chamber 330 and is cut by the grid plates 332 in the arc extinguishing chamber 330, thereby extinguishing the arc.

[0055] Optionally, the side of the arc extinguishing chamber 330 facing the moving contact assembly 100 is spaced from the peripheral wall of the contact support 110 of the moving contact assembly 100 by a preset distance, and the preset distance is 0 mm to 0.2 mm.

[0056] It should be noted that the preset distance can be 0 mm or 0.2 mm. When the preset distance is 0 mm, the side of the arc extinguishing chamber 330 facing the moving contact assembly 100 is in contact with the peripheral wall of the contact support 110.

[0057] Optionally, please refer to Figure 7 , the switching unit 300 for the disconnecting switch can be stacked along a preset direction B. The preset direction B is parallel to the rotation axis 111 of the contact support 110 in the moving contact assembly 100. The contact supports 110 in at least two switching units 300 for the disconnecting switch are linked to achieve synchronous rotation.

[0058] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A moving contact assembly, characterized in that: include: A contact support (110), a moving contact (120) and a permanent magnet (130) arranged on the contact support (110), wherein the permanent magnet (130) is used to extinguish an arc generated when the moving contact (120) is separated from a stationary contact (320), and the magnetic pole direction (A) of the permanent magnet (130) is perpendicular to the rotation axis (111) of the contact support (110).

2. The moving contact assembly according to claim 1, characterized in that: The orthographic projection of the permanent magnet (130) on the projection plane (112) of the contact support (110) is separated from the orthographic projection of the moving contact (120) on the projection plane (112).

3. The moving contact assembly according to claim 1, characterized in that: The permanent magnet (130) is located on a side of the moving contact (120) where the arc starting area (121) is provided.

4. The moving contact assembly according to any one of claims 1 to 3, characterized in that: The center of the moving contact (120) is located on the rotation axis (111) of the contact support (110), and the opposite ends of the moving contact (120) are respectively used to cooperate with two stationary contacts (320). The number of the permanent magnets (130) is an even number, wherein half of the permanent magnets (130) are located on one side of the moving contact (120), and the other half of the permanent magnets (130) are located on the other side opposite to the moving contact (120).

5. The moving contact assembly according to any one of claims 1 to 3, characterized in that: The contact support (110) comprises a base (113) and an upper cover (114) matched with the base (113); the moving contact (120) and the permanent magnet (130) are clamped and fixed between the base (113) and the upper cover (114).

6. The moving contact assembly according to claim 5, characterized in that: The base (113) is provided with a magnet slot, the permanent magnet (130) is placed in the magnet slot, and after the upper cover (114) is connected to the base (113), the slot of the magnet slot is closed so that the permanent magnet (130) is clamped and fixed between the base (113) and the upper cover (114).

7. A switch unit for an isolating switch, characterized in that: It comprises a housing (310), a stationary contact (320) arranged in the housing (310), and a moving contact assembly according to any one of claims 1 to 6, wherein the stationary contact (320) cooperates with a moving contact (120) of the moving contact assembly (100).

8. The switch unit for the isolating switch according to claim 7, characterized in that: The invention also includes an arc extinguishing chamber (330) arranged in the housing (310), and an arc extinguishing channel (331) is provided on the side of the arc extinguishing chamber (330) facing the moving contact assembly (100), and the arc extinguishing channel (331) is used for allowing the arc starting area (121) of the moving contact (120) to pass through during opening and closing, wherein the arc starting area (121) is the area where an arc is generated when the moving contact (120) is separated from the static contact (320).

9. The switch unit for the isolating switch according to claim 8, characterized in that: The side of the arc extinguishing chamber (330) facing the moving contact assembly (100) is spaced apart from the peripheral wall of the contact support (110) of the moving contact assembly (100) by a preset distance, and the preset distance is 0 mm to 0.2 mm.

10. The switch unit for the isolating switch according to any one of claims 7 to 9, characterized in that: The switch unit for the isolating switch can be stacked along a preset direction (B), and the preset direction (B) is parallel to the rotation axis (111) of the contact support (110) in the moving contact assembly (100).

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