Non-polar multi-pole small-sized DC contactor

Abstract

The application discloses a non-polarity multi-pole small DC contactor, which comprises a base assembly 2, a first magnetic box assembly 3, a second magnetic box assembly 4, four normally-open static contact assemblies 5 and four normally-closed static contact assemblies 6. The normally-open static contact assemblies 5 are installed at lower positions in the base assembly 2, and the normally-closed static contact assemblies 6 are installed at upper positions in the base assembly 2. The first magnetic box assembly 3 and the second magnetic box assembly 4 are oppositely installed at middle positions in the base assembly 2. Four first permanent magnets 301 are arranged in the first magnetic box assembly 3, and the first permanent magnets 301 are installed in a first polarity arrangement sequence. Four second permanent magnets 401 are arranged in the second magnetic box assembly 4, and the second permanent magnets 401 are installed in a second polarity arrangement sequence. The first polarity arrangement sequence is opposite to the second polarity arrangement sequence.

Description

Technical Field

[0001] This utility model relates to a low-voltage electrical switch, specifically a non-polar multi-pole miniature DC contactor. Background Technology

[0002] Currently, the circuit breaker operating mechanisms of gas-insulated switchgear (GIS), a key piece of equipment used in the power transmission and transformation industry, extensively employ 500VA DC motors to perform the opening and closing operations of the circuit breakers. The forward and reverse control of these DC motors requires DC contactors with eight sets of contacts. The DC contactor products currently used in this application are all early technologies and have some design flaws.

[0003] For example, a series of multi-pole miniature DC contactors employs permanent magnet arc extinguishing technology, using two permanent magnets per group of contacts. A total of 16 permanent magnets are needed for 8 groups of contacts. However, the large number of permanent magnets, being critical components, results in high material and manufacturing costs. Furthermore, users must strictly adhere to the terminal numbers specified in the product manual during wiring; otherwise, significant safety risks may arise.

[0004] For example, another type of DC contactor product uses permanent magnet arc extinguishing technology with two large permanent magnets. The two permanent magnets are installed on both sides of the outside of the arc extinguishing chamber. However, because the two permanent magnets are installed on both sides of the outside of the arc extinguishing chamber, the four contacts closer to the middle of the eight contacts will be far away from the permanent magnets. The magnetic field strength experienced by the contact breaking and generating an arc is relatively weak, resulting in differences in the arc extinguishing ability between different contacts, which affects the overall technical performance of the product.

[0005] In summary, existing DC contactors often suffer from drawbacks such as a large number of permanent magnets, complex assembly, limited current flow direction, increased size, and inconvenient installation. Summary of the Invention

[0006] In view of the shortcomings of existing DC contactors, such as the large number of permanent magnets, complex assembly, limited current flow direction, increased size, and inconvenient installation, the technical problem to be solved by this utility model is to provide a non-polar multi-pole miniature DC contactor to overcome the above-mentioned shortcomings of the existing technology.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model provides a non-polar multi-pole miniature DC contactor. The body 1 of the non-polar multi-pole miniature DC contactor includes: a base assembly 2, a first magnetic box assembly 3, a second magnetic box assembly 4, four normally open stationary contact assemblies 5, and four normally closed stationary contact assemblies 6. The normally open stationary contact assemblies 5 are installed in the lower position within the base assembly 2, and the normally closed stationary contact assemblies 6 are installed in the upper position within the base assembly 2. The first magnetic box assembly 3 and the second magnetic box assembly 4 are installed opposite each other in the middle position within the base assembly 2. The first magnetic box assembly 3 contains four first permanent magnets 301, and the first permanent magnets 301 are arranged in a first polarity order within the first magnetic box assembly 3. The second magnetic box assembly 4 contains four second permanent magnets 401, and the second permanent magnets 401 are arranged in a second polarity order within the second magnetic box assembly 4. The arrangement order of the permanent magnets in the first polarity order is the opposite of the arrangement order in the second polarity order.

[0008] Optionally, the base assembly 2 includes: a base 201, a base assembly 202, a bracket assembly 203, and a return spring 204; the bracket assembly 203 is installed inside the base 201, the base assembly 202 is installed below the base 201, and the return spring 204 is installed between the bracket assembly 203 and the base assembly 202.

[0009] Optionally, the base assembly 202 is provided with several electromagnets, which together with the return spring 204 drive the bracket assembly 203 to reciprocate.

[0010] Optionally, the bracket assembly 203 includes: a support 2031, eight moving contacts 2032, and eight contact springs 2033; wherein the eight moving contacts 2032 correspond to the eight contact springs 2033 and are symmetrically mounted on the support 2031.

[0011] Optionally, the normally open stationary contact assembly 5 includes: a normally open stationary contact 501 and a first contact plate 502; the normally open stationary contact 501 is located at one end of the contact plate 502.

[0012] Optionally, the normally closed stationary contact assembly 6 includes: a normally closed stationary contact 601 and a second contact plate 602; the normally closed stationary contact 601 is located at one end of the second contact plate 602.

[0013] Optionally, each group of normally closed stationary contacts and normally open contacts on the same side can share one permanent magnet.

[0014] Optionally, each set of contacts adopts a double-break structure, and the magnetic field at the double breaks is provided by the first permanent magnet 301 and the second permanent magnet 401 in the first magnetic box assembly 3 and the second magnetic box assembly 4, respectively, and the magnetic field directions at the double breaks are opposite.

[0015] Optionally, the permanent magnets equipped with each pair of adjacent contact groups have the same polarity.

[0016] Optionally, the first polarity arrangement order is: [S, N], [N, S], [S, N], [N, S]; the second polarity arrangement order is: [N, S], [S, N], [N, S], [S, N].

[0017] This utility model has the following beneficial effects and advantages: 1. This utility model utilizes permanent magnet blowout technology to extinguish arcs. The normally closed and normally open contacts on the same side of each group share the permanent magnetic field established by one permanent magnet for arc extinguishing. A total of 8 permanent magnets are required for 8 groups of contacts. With the volume of a single permanent magnet remaining unchanged, the total number of permanent magnets is greatly reduced, and the material cost is significantly reduced.

[0018] 2. All permanent magnets used in this utility model are installed inside the magnetic box assembly, which does not increase the overall size of the product. This enables modular production of semi-finished products and further reduces manufacturing costs.

[0019] 3. In this utility model, each group of contacts adopts a double-break structure design. The magnetic field at the double breaks is provided by permanent magnets in the first magnetic box assembly and the second magnetic box assembly, respectively. Figure 1 , Figure 2 As shown, the magnetic field directions at the double breaks are exactly opposite. That is, when each set of contacts breaks, the electric arc generated at the double breaks will be stretched in the same direction. One arc is stretched towards the inside of the product, and the other arc is stretched towards the outside of the product. The two arcs will not meet, so there is no need to impose strict requirements on the user's wiring, truly achieving the characteristic of non-polarity.

[0020] 4. In this invention, each group of contacts is equipped with a permanent magnet, and the permanent magnets are all installed near the contacts. This ensures that the rated breaking capacity of each group of contacts is the same, eliminating any deviation in breaking capacity that could indirectly affect product performance. Furthermore, the permanent magnets in each pair of adjacent groups of contacts have the same polarity, preventing magnetic field interference between them and further promoting the stability of the magnetic field established by the permanent magnets themselves. Attached Figure Description

[0021] Figure 1 This is a top view and an oblique view of a non-polar multi-pole miniature DC contactor according to the present invention; Figure 2 These are oblique views, front views, top views, and side cross-sectional views of the first magnetic box assembly in this utility model. Figure 3 These are oblique views, front views, top views, and side cross-sectional views of the second magnetic box assembly in this utility model. Figure 4 This is an oblique view of the base assembly in this utility model; Figure 5This is an inclined cross-sectional view of the base assembly in this utility model; Figure 6 This is an oblique view of the support assembly in this utility model; Figure 7 This is an oblique view of the normally open stationary contact assembly and the normally closed stationary contact assembly of this utility model.

[0022] In the diagram: 1-Non-polarity multi-pole miniature DC contactor body, 2-Base assembly, 3-First magnetic box assembly, 4-Second magnetic box assembly, 5-Normally open stationary contact assembly, 6-Normally closed stationary contact assembly, 201-Base, 202-Base assembly, 203-Bracket assembly, 301-First permanent magnet, 401-Second permanent magnet, 501-Normally open stationary contact, 502-First contact plate, 601-Normally closed stationary contact, 602-Second contact plate, 2031-Support component, 2032-Moving contact, 2033-Contact spring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 1-3 As shown, this utility model discloses a non-polarized multi-pole miniature DC contactor. The non-polarized multi-pole miniature DC contactor body 1 includes: a base assembly 2, a first magnetic box assembly 3, a second magnetic box assembly 4, four normally open stationary contact assemblies 5, and four normally closed stationary contact assemblies 6. The normally open stationary contact assemblies 5 are installed in the lower position within the base assembly 2, and the normally closed stationary contact assemblies 6 are installed in the upper position within the base assembly 2. The first magnetic box assembly 3 and the second magnetic box assembly 4 are installed in the middle position within the base assembly. Each of the first magnetic box assembly 3 and the second magnetic box assembly 4 is provided with four first permanent magnets 301 and four second permanent magnets 401. The first permanent magnets 301 in the first magnetic box assembly 3 are as follows: Figure 1 The second permanent magnet 401 inside the second magnetic box assembly 4 is installed according to the polarity shown (i.e., installed in the order of the first polarity [S, N], [N, S], [S, N], [N, S]). Figure 2 Install according to the polarity shown (i.e., install according to the second polarity arrangement order [N, S], [S, N], [N, S], [S, N]).

[0025] The arrangement of permanent magnets in the first polarity arrangement is the opposite of that in the second polarity arrangement.

[0026] Optional, such as Figure 4 As shown, the base assembly 2 includes a base 201, a base assembly 202, a bracket assembly 203, and a return spring 204. The bracket assembly 203 is installed inside the base 201, the base assembly 202 is installed below the base 201, and the return spring 204 is installed between the bracket assembly 203 and the base assembly 202.

[0027] Optionally, as shown in Figure 4 , a plurality of electromagnets (not shown in the figure) are arranged in the base assembly 202, and the plurality of electromagnets together with the return spring 204 drive the bracket assembly 203 to reciprocate. The specific working principle is: when the electromagnet is energized, it drives the bracket assembly 203 to move upward under the action of magnetic force, and when the electromagnet is de-energized, the reverse acting force of the return spring 203 makes the bracket assembly 203 move downward to reset; or, when the electromagnet is energized, it drives the bracket assembly 203 to move downward under the action of magnetic force, and when the electromagnet is de-energized, the reverse acting force of the return spring 204 makes the bracket assembly 203 move upward to reset. The present application does not specifically limit the above two implementation manners, which can be adjusted according to actual situations.

[0028] Optionally, as shown in Figure 6 , the bracket assembly 203 includes: a support member 2031, 8 movable contacts 2032 and 8 contact springs 2033. The 8 movable contacts 2032 correspond to the 8 contact springs 2033, as shown in Figure 6 , are symmetrically mounted on the support member 2031.

[0029] Optionally, as shown in Figure 7 , the normally open static contact assembly 5 includes: a normally open static contact 501 and a first contact plate 502; the normally open static contact 501 is located at one end of the first contact plate 502.

[0030] Specifically, the first contact plate 502 may be L-shaped, the normally open static contact is a circular protrusion located at the non-fixed end of the first contact plate 502, and the fixed end thereof may be fixed by a screw.

[0031] Optionally, as shown in Figure 7 , the normally closed static contact assembly 6 includes: a normally closed static contact 601 and a second contact plate 602; the normally closed static contact 601 is located at one end of the second contact plate 602.

[0032] Specifically, the second contact plate 602 may be in a "C" shape or a U shape, the normally closed static contact 601 is located at one inner end of the second contact plate 602, and the second contact plate 602 may be fixed by a screw.

[0033] The working process and principle of the present utility model are as follows: In this invention, the magnetic system in the base assembly 202 receives power from an external power source to form a power source, which drives the bracket assembly 203 to move, causing the moving contact 2032 to separate from the normally closed stationary contact 602. Each set of contacts forms a double break, and an electric arc is formed at the double break. The first permanent magnet 301 and the second permanent magnet 401 are installed below the moving contact 2032 and the normally closed stationary contact 602, and form a stable magnetic field at the break. The electric arc is stretched by the magnetic field. The electric arc at one of the double breaks is stretched to the outside of the product, and the electric arc at the other break is stretched to the inside of the product. The two electric arcs will not meet. After stretching, the electric arc is extinguished, the current drops to zero, and the normally closed circuit is cut off. At the same time, the moving contact 2032 meets the normally open stationary contact 501 and compresses the contact spring 2033, so that the normally open circuit is turned on.

[0034] In this invention, when the magnetic system in the base assembly 202 is de-energized and the power source disappears, the support assembly 203 moves in the opposite direction under the action of the reset spring 204, causing the moving contact 2032 to separate from the normally open stationary contact 501, forming a double break in each group of contacts. An electric arc is formed at the double break. The permanent magnets 301 and 401 are installed above the moving contact 2032 and the normally open stationary contact 501, and form a stable magnetic field at the break. The electric arc is stretched by the magnetic field. The electric arc at one of the double breaks is stretched outward from the product, and the electric arc at the other break is stretched inward from the product. The two electric arcs will not meet. After stretching, the electric arc is extinguished, the current drops to zero, and the normally open circuit is cut off. At the same time, the moving contact 2032 meets the normally closed stationary contact 601 and compresses the contact spring 2033, making the normally closed circuit conduct.

Claims

1. A non-polar, multi-pole miniature DC contactor, characterized in that, The body (1) of the non-polar multipole miniature DC contactor includes: a base assembly (2), a first magnetic box assembly (3), a second magnetic box assembly (4), four normally open stationary contact assemblies (5) and four normally closed stationary contact assemblies (6); The normally open stationary contact assembly (5) is installed in the lower part of the base assembly (2), and the normally closed stationary contact assembly (6) is installed in the upper part of the base assembly (2); the first magnetic box assembly (3) and the second magnetic box assembly (4) are installed opposite each other in the middle part of the base assembly (2); The first magnetic box assembly (3) is provided with four first permanent magnets (301), and the first permanent magnets (301) in the first magnetic box assembly (3) are installed in the order of first polarity; The second magnetic box assembly (4) is provided with four second permanent magnets (401), and the second permanent magnets (401) in the second magnetic box assembly (4) are installed in the order of second polarity; The arrangement of permanent magnets in the first polarity arrangement is the opposite of that in the second polarity arrangement.

2. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, The base assembly (2) includes: a base (201), a base assembly (202), a bracket assembly (203), and a return spring (204); The bracket assembly (203) is installed inside the base (201), the base assembly (202) is installed below the base (201), and the reset spring (204) is installed between the bracket assembly (203) and the base assembly (202).

3. The non-polar multi-pole miniature DC contactor according to claim 2, characterized in that, The base assembly (202) is equipped with several electromagnets, which together with the reset spring (204) drive the bracket assembly (203) to reciprocate.

4. The non-polar multi-pole miniature DC contactor according to claim 2, characterized in that, The support assembly (203) includes: a support (2031), eight moving contacts (2032), and eight contact springs (2033); Among them, 8 moving contacts (2032) correspond to 8 contact springs (2033) and are symmetrically installed on the support (2031).

5. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, The normally open stationary contact assembly (5) includes: a normally open stationary contact (501) and a first contact plate (502); The normally open stationary contact (501) is located at one end of the first contact plate (502).

6. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, The normally closed stationary contact assembly (6) includes: a normally closed stationary contact (601) and a second contact plate (602); The normally closed stationary contact (601) is located at one end of the second contact plate (602).

7. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, Each group of normally closed stationary contacts and normally open contacts on the same side share one permanent magnet.

8. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, Each set of contacts adopts a double break structure. The magnetic field at the double break is provided by the first permanent magnet (301) and the second permanent magnet (401) in the first magnetic box assembly (3) and the second magnetic box assembly (4), respectively, and the magnetic field at the double break is in opposite directions.

9. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, The permanent magnets in each pair of adjacent contact pairs have the same polarity.

10. The non-polar multi-pole miniature DC contactor according to claim 1, characterized in that, The first polarity arrangement order is as follows: [S, N], [N, S], [S, N], [N, S]; The second polarity arrangement is as follows: [N, S], [S, N], [N, S], [S, N].

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