Direct current contact module with large current and high breaking capacity

Abstract

The utility model discloses a direct current contact module with large current and high breaking capacity, which comprises an upper cover, two shells are arranged at the bottom end of the upper cover, moving contact assemblies are arranged in the centers of the interiors of the two shells, and static contact assemblies are respectively arranged at the front ends and the rear ends of the two shells. An arc extinguish chamber assembly is arranged on the outer side of the static contact assembly and the outer side of the moving contact assembly. Through cooperative work of the above structures, load current can be broken on load, the function of an isolation switch can be played when a breaker fails and a load circuit cannot be cut off, load side current is cut off, loss caused by the fact that a power supply is not cut off in time due to the failure of the load side is prevented, and a standby guarantee is provided equivalently. Once an electric power system breaks down, the range is wide, and property and personal safety is threatened, the scheme can not only achieve the intrinsic isolation characteristic, but also provide dual protection for the electric power system.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly relates to a DC contact module with high current and high breaking capacity. Background Technique

[0002] At present, most of the DC isolators with high current on the market are isolators, which can only be used as an obvious disconnection point during the maintenance of the load side. It cannot operate with load and can only be disconnected after the circuit breaker on the load side is disconnected. If the circuit breaker at the lower end fails and cannot be separated, it is impossible to emergently disconnect the load side current, because it has no arc extinguishing ability. Forcibly disconnecting the load-carrying circuit will cause the switch to continuously arc and burn out. Therefore, this kind of isolator cannot complete the emergency disconnection of the load side current when the circuit breaker fails, which will cause unnecessary losses. Therefore, a DC isolator that can break high current is needed, which can break the load side current when the circuit breaker at the lower end fails, cut off the power supply of the load side in time, and reduce the losses of the electrical appliances on the load side caused by circuit failures. Content of the Utility Model

[0003] The purpose of the utility model is to provide a DC contact module with high current and high breaking capacity, so as to solve the problem that most of the DC isolators with high current on the market at present are isolators, which can only be used as an obvious disconnection point during the maintenance of the load side and cannot operate with load as mentioned in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A DC contact module with high current and high breaking capacity, including an upper cover, and two shells are arranged at the bottom end of the upper cover, and a moving contact assembly is arranged at the center of the two shells.

[0005] The moving contact assembly includes a contact support, a plurality of spring pieces are arranged inside the contact support, a plurality of magnetic conductive pieces are fixedly connected to the inside of the contact support, a moving contact is arranged inside each of the plurality of magnetic conductive pieces, the contact support is rotatably connected to the center of the two shells, and the outside of the magnetic conductive piece is slidably connected to the inside of the spring piece.

[0006] Preferably, the two shells are connected by bolts in a threaded manner, a clamping block is processed at the outer top end of the two shells, a buckle adapted to the clamping block is processed at the outer bottom end of the upper cover, and limiting blocks are symmetrically arranged inside the two shells.

[0007] Preferably, a plurality of square holes are penetrated through the outer wall of the contact support, and convex platforms are processed on one side of the front end and the rear end of the square hole, and the arc-shaped protrusions on the outside of the plurality of spring pieces are fixedly connected to the inside of the square hole.

[0008] Preferably, a groove is formed in the inner side of the magnetic conductive sheet, and the moving contact is clamped inside the magnetic conductive sheet.

[0009] Preferably, static contact assemblies are respectively arranged at the front end and the rear end of the two housings. The static contact assembly includes contact contacts. A wiring row is fixedly connected to the outer sides of the plurality of contact contacts. An arc receiving contact is welded to the top end of one of the contact contacts. The wiring rows are respectively clamped inside the front ends and the rear ends of the two housings.

[0010] Preferably, arc-resistant silver points are welded to the outer wall of the arc receiving contact.

[0011] Preferably, arc extinguishing chamber assemblies are arranged on the outer sides inside the two housings. The arc extinguishing chamber assembly includes an arc leading angle. The arc leading angle is fixedly connected to one side of the arc extinguishing grid sheet. The arc extinguishing grid sheet is clamped inside the housing, and the two arc extinguishing grid sheets are symmetrical to each other. The two arc extinguishing grid sheets are sleeved on the outer sides of the static contact assembly and the moving contact assembly. The arc leading angle is arranged at one end close to the arc receiving contact.

[0012] Preferably, a plurality of exhaust holes are evenly formed in the inner sides around the two housings.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: for this DC contact module with high current and high breaking capacity, by arranging three contact contacts on the wiring row in the static contact assembly, and welding an arc receiving contact to the top end of one of the contact contacts, two of the contact contacts ensure the static stability of the switch, that is, ensure that the switch has good temperature rise and short-time withstand, and the top end of the other contact contact is provided with an arc receiving contact, so that the switch has good dynamic stability, that is, ensure that the switch has good electrical life and short-circuit making capacity;

[0014] Through the cooperative work of the arc extinguishing chamber assembly, the arc is more easily introduced into the arc extinguishing cover, and the arc can be quickly cut off. At the same time, by providing exhaust holes on the housing, the arc can be guided to more easily enter the arc extinguishing grid sheet;

[0015] In the open state, the elevation angle of the moving contact assembly is particularly large, reaching 120 degrees, so that the opening distance of the switch is particularly large, improving the electrical performance of the switch. The closing is of the plug-in type. When there is current passing through, suction force will be generated between the two magnetic conductive sheets, making the contact pressure greater;

[0016] Through the coordinated operation of the above structure, it can break the load current under load, play the role of a disconnecting switch when the circuit breaker fails to cut off the load circuit, cut off the current on the load side, prevent losses caused by the failure to cut off the power supply in time on the load side, provide a backup guarantee, make the load side circuit safer. Once a fault occurs in the power system, the scope is wide, threatening property and personal safety. This solution can not only achieve the original isolation characteristics, but also provide double protection for the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall exploded view of the present utility model;

[0018] Figure 2 is the schematic diagram of the open state of the present utility model;

[0019] Figure 3 is the schematic diagram of the closed state of the present utility model;

[0020] Figure 4 is the present utility model Figure 1 the schematic diagram of the connection structure of the static contact assembly in;

[0021] Figure 5 is the present utility model Figure 1 the schematic diagram of the connection structure of the arc extinguishing chamber assembly in;

[0022] Figure 6 is the present utility model Figure 1 the schematic diagram of the connection structure of the moving contact assembly in.

[0023] In the figure: 1. upper cover; 2. arc extinguishing chamber assembly; 201. arc leading angle; 202. arc extinguishing grid; 3. static contact assembly; 301. contact contact; 302. wiring row; 303. arc receiving contact; 4. housing; 5. moving contact assembly; 501. contact support; 502. spring piece; 503. magnetic conductive sheet; 504. moving contact. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment 1

[0026] Please refer to Figures 1 - 3 and Figure 6As shown in the figure, the present utility model provides a technical solution: a DC contact module with high current and high breaking capacity, including an upper cover 1. At the bottom end of the upper cover 1, there are two housings 4, and the two housings 4 are used to support the arc extinguishing chamber assembly 2, the static contact assembly 3, and the moving contact assembly 5. At the center of the interior of the two housings 4, there is a moving contact assembly 5, and the moving contact assembly 5 is used to disperse the current when a large current passes through the circuit.

[0027] The moving contact assembly 5 includes a contact support 501. Inside the contact support 501, there are multiple spring pieces 502. The spring pieces 502 are used to provide pressure to the moving contact 504, so as to ensure good contact between the moving contact 504 and the static contact assembly 3. Inside the contact support 501, multiple magnetic conduction pieces 503 are fixedly connected. When current passes through the magnetic conduction pieces 503, suction force will be generated between the two magnetic conduction pieces 503, making the pressure of the moving contact 504 greater. Inside the multiple magnetic conduction pieces 503, there is a moving contact 504. The moving contact 504 is used to contact or separate from the static contact assembly 3, so as to control the cut-off or conduction of the load side of the DC contact module. The contact support 501 is rotatably connected to the center of the interior of the two housings 4. The contact support 501 is used to install and support the moving contact 504. The outer side of the magnetic conduction piece 503 is slidably connected to the inner side of the spring piece 502. The two housings 4 are connected by bolts in a threaded manner. At the outer top ends of the two housings 4, there are blocks processed. At the outer bottom end of the upper cover 1, there is a buckle adapted to the block. The upper cover 1 can be buckled to the top ends of the two housings 4. And inside the two housings 4, there are symmetrically arranged limiting blocks. Multiple square holes are penetrated through the outer wall of the contact support 501, and at one side of the front end and the rear end of the square hole, there are bosses processed. Inside the square hole, there are respectively installed the spring piece 502, the magnetic conduction piece 503, and the moving contact 504. The arc-shaped protrusions on the outer sides of the multiple spring pieces 502 are fixedly connected to the inside of the square hole. The inner side of the magnetic conduction piece 503 is provided with a groove, and the moving contact 504 is clamped inside the magnetic conduction piece 503. The groove of the magnetic conduction piece 503 cooperates with the boss of the contact support 501 for limiting, to prevent the spring piece 502, the magnetic conduction piece 503, and the moving contact 504 from separating from the contact support 501 during the closing and opening process. At the same time, through the mutual cooperation of the boss and the limiting block, the overall movement stroke of the moving contact assembly 5 can be limited.

[0028] By setting the moving contact assembly 5, good contact between it and the static contact assembly 3 can be ensured. At the same time, the three moving contacts 504 are in parallel connection. When a large current passes through the circuit, the current will be evenly divided by the three moving contacts 504, and the large current can be well dispersed. This not only increases the electrical life of the switch, but also makes the switch particularly stable.

[0029] Embodiment 2

[0030] Please refer to Figures 1 - 3 andFigure 4 As shown, on the basis of the first embodiment, static contact assemblies 3 are respectively arranged at the front end and the rear end of the two housings 4. The static contact assembly 3 includes a contact tip 301, and the contact tip 301 is used to contact with the moving contact 504 to complete the opening or closing state of the overall DC contact module. A wiring row 302 is fixedly connected to the outside of the plurality of contact tips 301, and the wiring row 302 is used to connect the contact tips 301 to the external connecting wires. An arc contact 303 is welded to the top end of one of the contact tips 301, and the arc contact 303 is used to bear the arc generated during the opening and closing of the switch. The wiring row 302 is respectively clamped inside the front end and the rear end of the two housings 4. An arc-resistant silver point is welded to the outer wall of the arc contact 303 for protecting the arc contact 303.

[0031] By arranging the static contact assembly 3 and welding an arc contact 303 on one of the contact tips 301, the arc contact 303 contacts the moving contact assembly 5 first during closing, so the contact arc is borne by the arc contact 303. During the opening process, the arc contact 303 is disconnected after the other two contact tips 301 are disconnected, so all the arcs generated during the opening of the switch are borne by the arc contact 303. Because an arc-resistant silver point is welded on the arc contact 303, although the closing or opening arc burns it, it will not have too much impact and does not affect the electrical performance of the entire switch, ensuring good dynamic stability of the switch. The contact tip 301 serves as a static connection to ensure the static stability of short-time withstand and temperature rise. Therefore, the three contact tips of the static contact assembly 3 perform their respective functions, making the switch have good dynamic stability and static stability.

[0032] Embodiment Three

[0033] Please refer to Figures 1 - 3 and Figure 5 As shown, on the basis of the first and second embodiments, an arc extinguishing chamber assembly 2 is arranged on the outer side of the inside of the two housings 4. The arc extinguishing chamber assembly 2 is used to extinguish the arc generated during the opening and closing of the module. The arc extinguishing chamber assembly 2 includes an arc guide angle 201, and the arc guide angle 201 is fixedly connected to one side of the arc extinguishing grid 202. The arc guide angle 201 is used to guide the arc generated during the opening and closing and introduce the arc into the inside of the arc extinguishing grid 202. The arc extinguishing grid 202 is clamped inside the housing 4. The arc extinguishing grid 202 is used to extinguish the arc, and the two arc extinguishing grids 202 are symmetrical to each other. The two arc extinguishing grids 202 are sleeved on the outside of the static contact assembly 3 and the moving contact assembly 5. The arc guide angle 201 is arranged at one end close to the arc contact 303. A plurality of exhaust holes are evenly opened around the inner sides of the two housings 4, and the exhaust holes are used to guide the arc, making the arc generated during the opening and closing more likely to enter the inside of the arc extinguishing grid 202.

[0034] By setting the arc extinguishing chamber assembly 2, and the distance between the arc ignition angle 201 and the arc receiving contact 303 in the static contact assembly 3 is relatively close, an arc is generated between the arc receiving contact 303 and the moving contact assembly 5 during the opening and closing processes. During the continuous elongation of the arc, the arc root will transfer to the arc ignition angle 201. When the moving contact assembly 5 opens to the maximum position, due to the increase in the cavity pressure, the high-temperature and high-pressure gas will drive the arc to move towards the exhaust hole direction, thus directly bringing the entire arc into the arc extinguishing chamber assembly 2. The arc is cut into several arcs by the arc extinguishing chamber assembly 2, increasing the arc voltage and making it difficult for the arc to continue burning, thereby achieving the effect of arc extinguishing.

[0035] Embodiment 4

[0036] Please refer to Figures 1 - 6 As shown, by combining Embodiment 1, Embodiment 2, and Embodiment 3, this embodiment is obtained. When the entire moving contact assembly 5 tilts upward by 120 degrees, the moving contact assembly 5 and the static contact assembly 3 are separated from each other. At this time, the DC contact module is in the open state, and the load side of the DC contact module will be cut off. On the contrary, when the moving contact assembly 5 contacts the static contact assembly 3, the module is in the closed state, and the load side will be conducted. By providing three contact contacts 301 on the wiring row 302 in the static contact assembly 3, and welding an arc receiving contact 303 at the top of one of the contact contacts 301, two of the contact contacts 301 ensure the static stability of the switch, that is, ensure that the switch has good temperature rise and short-time withstand. The top of the other contact contact 301 is provided with an arc receiving contact 303, making the switch have good dynamic stability, that is, ensuring that the switch has good electrical life and short-circuit making ability. By designing the arc extinguishing chamber assembly 2 and opening an exhaust hole on the outer wall of the housing 4, the arc can be guided to enter the arc extinguishing grid 202 more easily, and the arc can be quickly cut off, thereby achieving the purpose of arc extinguishing. It can not only achieve the original isolation characteristics but also provide double protection for the power system.

[0037] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A DC contact module with high current and high breaking capacity, including an upper cover (1), characterized in that, Two housings (4) are provided at the bottom end of the upper cover (1), and a moving contact assembly (5) is provided at the center of the interior of the two housings (4). The moving contact assembly (5) includes a contact support (501). A plurality of spring pieces (502) are provided inside the contact support (501). A plurality of magnetic conduction pieces (503) are fixedly connected to the inside of the contact support (501). A moving contact (504) is provided inside each of the plurality of magnetic conduction pieces (503). The contact support (501) is rotatably connected to the center of the interior of the two housings (4). The outside of the magnetic conduction piece (503) is slidably connected to the inside of the spring piece (502).

2. The DC contact module with high current and high breaking capacity according to claim 1, characterized in that, The two housings (4) are connected to each other by bolts in a threaded manner. Blocks are machined at the outer top ends of the two housings (4). A buckle adapted to the block is machined at the outer bottom end of the upper cover (1). And limiting blocks are symmetrically arranged inside the two housings (4).

3. The DC contact module with high current and high breaking capacity according to claim 1, characterized in that, A plurality of square holes are formed through the outer wall of the contact support (501), and bosses are machined on one side of the front end and the rear end of the square hole. The arc-shaped protrusions on the outside of the plurality of spring pieces (502) are fixedly connected to the inside of the square hole.

4. A DC contact module with high current and high breaking capacity according to claim 1, characterized in that A groove is formed inside the magnetic conduction piece (503), and the moving contact (504) is snap-fitted inside the magnetic conduction piece (503).

5. A DC contact module with high current and high breaking capacity according to claim 1, characterized in that, Static contact assemblies (3) are respectively arranged at the front end and the rear end of the two housings (4). The static contact assembly (3) includes a contact head (301). A wiring row (302) is fixedly connected to the outside of the plurality of contact heads (301). An arc contact (303) is welded to the top end of one of the contact heads (301). The wiring row (302) is respectively snap-fitted inside the front end and the rear end of the two housings (4).

6. The DC contact module with high current and high breaking capacity according to claim 5, characterized in that An arc-resistant silver point is welded to the outer wall of the arc contact (303).

7. A DC contact module with high current and high breaking capacity according to claim 1, characterized in that Arc extinguishing chamber assemblies (2) are arranged on the outer sides inside the two housings (4). The arc extinguishing chamber assembly (2) includes an arc guide angle (201). The arc guide angle (201) is fixedly connected to one side of the arc extinguishing grid piece (202). The arc extinguishing grid piece (202) is snap-fitted inside the housing (4), and the two arc extinguishing grid pieces (202) are symmetric to each other. The two arc extinguishing grid pieces (202) are sleeved on the outside of the static contact assembly (3) and the moving contact assembly (5). The arc guide angle (201) is arranged at one end close to the arc contact (303).

8. A DC contact module with high current and high breaking capacity according to claim 1, characterized in that A plurality of exhaust holes are evenly formed in the periphery inside the two housings (4).

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