Bipolar high-voltage direct current contactor

Abstract

The utility model discloses a bipolar high-voltage direct-current contactor, which comprises a shell and a contactor body, the contactor body comprises an electromagnetic driving mechanism, a moving contact assembly and a static contact assembly. The moving contact assembly comprises a moving contact mounting rack and a moving contact; the moving contact mounting rack is mounted on a driving rod of the electromagnetic driving mechanism; the static contact assembly comprises a static contact mounting rack and a static contact, and the static contact is opposite to the moving contact; two moving contacts are arranged on the moving contact mounting rack, and static contacts are arranged on the static contact mounting rack corresponding to the two ends of each moving contact; the moving contact mounting rack is movably sleeved on the driving rod, a first spring is arranged on the driving rod, and the first spring provides elastic force for the moving contact to enable the moving contact to keep a trend of moving towards the static contact; each moving contact is movably connected with the moving contact mounting rack through an elastic connecting structure; according to the utility model, through the optimized design, the requirement for controlling two direct-current circuits at the same time can be met, and the adaptability is good.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of direct current contactor, specifically relates to a kind of bipolar high-voltage direct current contactor. BACKGROUND

[0002] High-voltage direct current contactor is a kind of electrical switching device for high-voltage direct current circuit, mainly used for controlling the start-stop and switching high-voltage direct current load of direct current motor. Its working principle is to use the action of electromagnet, to open or close the circuit by electromagnetic attraction or release, to realize the control of current. High-voltage direct current contactor can be widely used in electric vehicle charging pile, industrial automation system and power transmission and distribution and many other fields. At present, most of the high-voltage direct current contactors on the market adopt single-pole structure, and can only control the on-off operation of one direct current loop. This design makes it necessary to install two direct current contactors to achieve the purpose when two direct current circuits need to be controlled, which will result in high use cost. SUMMARY

[0003] To this end, the utility model aims at providing a kind of bipolar high-voltage direct current contactor, to realize the function of simultaneously controlling two direct current loops.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] The utility model provides a kind of bipolar high-voltage direct current contactor, including shell and the contactor body in shell, the contactor body includes electromagnetic drive mechanism, movable contact subassembly and static contact subassembly, the electromagnetic drive mechanism has telescopic mobile drive rod, the movable contact subassembly includes movable contact mounting bracket and the movable contact of being installed on movable contact mounting bracket, movable contact mounting bracket is installed on the drive rod, the static contact subassembly includes static contact mounting bracket and the static contact of being installed on static contact mounting bracket, the static contact is opposite to movable contact, two movable contacts are installed on the movable contact mounting bracket, the static contact is installed on the two ends of each movable contact of static contact mounting bracket, the movable contact mounting bracket is movably sleeved on the drive rod, and first spring is installed on drive rod, the first spring provides elastic force for movable contact to make movable contact keep the tendency of moving to static contact, each movable contact is movably connected with movable contact mounting bracket by elastic connecting structure, and under the elastic force of the elastic connecting structure, the side of the movable contact opposite to static contact is attached to the movable contact mounting bracket in normal state.

[0006] Preferably, the elastic connecting structure comprises a limiting shaft, a second spring and a limiting piece; the movable contact mounting frame is provided with a limiting hole coaxial with the driving rod, the movable contact is provided with a mounting hole aligned with the limiting hole, the limiting shaft penetrates through the limiting hole and the mounting hole and cooperates with the limiting piece to movably mount the movable contact on the movable contact mounting frame, and the second spring provides elastic force for the limiting shaft so that the side of the movable contact away from the fixed contact abuts against the movable contact mounting frame.

[0007] Preferably, the end of the limiting shaft away from the fixed contact is provided with a limiting end, the limiting piece is fixed on the limiting shaft at the end close to the fixed contact, and the second spring is sleeved on the limiting shaft and abuts against the limiting end and the movable contact mounting frame at two ends respectively.

[0008] Preferably, the two movable contacts are centrally symmetrically arranged on the movable contact mounting frame with respect to the driving rod.

[0009] Preferably, the movable contact mounting frame is provided with an auxiliary switch, the driving rod triggers the auxiliary switch when the movable contact is in the position of contacting the fixed contact, and the driving rod does not trigger the auxiliary switch when the movable contact is in the position of separating from the fixed contact.

[0010] Preferably, the electromagnetic driving mechanism is fixedly connected with a support frame opposite to the fixed contact mounting frame, a containing space is formed between the support frame and the fixed contact mounting frame, and the movable contact assembly and the fixed contact are located in the containing space; the fixed contact mounting frame is provided with a magnet at a position close to the fixed contact.

[0011] Preferably, the fixed contact mounting frame is provided with a positioning groove with an opening facing the direction of the support frame, the magnet is embedded in the positioning groove, the support frame is provided with a contact rod extending to the positioning groove, and the end of the contact rod abuts against the magnet.

[0012] Preferably, the direct current contactor further comprises a hollow shell accommodated in the shell, one end of the hollow shell is closed, the other end is open, the contactor body is accommodated in the hollow shell through the open end, the fixed contact mounting frame closes the open end, and the fixed contact mounting frame is provided with an exhaust pipe, the inner end of the exhaust pipe communicates with the containing space, and the outer end of the exhaust pipe extends to the outside of the shell.

[0013] Preferably, the housing is further provided with a positioning frame on the side of the static contact mounting frame away from the electromagnetic driving mechanism, the positioning frame is provided with a positioning hole through which the air exhaust pipe passes, and the positioning frame is provided with a lead positioning groove in which a lead connected with the electromagnetic driving mechanism is clamped and led out of the housing through a lead hole.

[0014] Preferably, the static contact mounting frame is provided with a limiting plate protruding towards the positioning frame, an inner side of the limiting plate forms a contact chamber, each moving contact and two static contacts corresponding to the moving contact are located in the contact chamber, and a side of the limiting plate is provided with a notch through which the moving contact mounting frame extends.

[0015] The bipolar high-voltage DC contactor has the following advantages: the structure of the bipolar high-voltage DC contactor is optimized, the function of simultaneously controlling two DC circuits can be realized, each moving contact is movably connected with the moving contact mounting frame through the elastic connecting structure, the moving contact is abutted against the moving contact mounting frame on the side away from the static contact under the elastic force of the elastic connecting structure in a normal state, the moving contact mounting frame can support the moving contact, the stable position of the moving contact is ensured, the adaptive fine adjustment of the moving contact according to needs when the moving contact contacts the static contact is allowed, the assembly or machining errors that may exist are adapted to, the contact effect and the electrical conduction performance between the moving contact and the static contact are improved, and the problem of poor contact caused by errors in actual application can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following briefly introduces the drawings needed to be used in the specific embodiment or the prior art description. In the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0017] Figure 1 It is a three-dimensional schematic view of the bipolar high-voltage DC contactor in the utility model;

[0018] Figure 2 It is a three-dimensional schematic view of the bipolar high-voltage DC contactor in the utility model after removing the housing;

[0019] Figure 3 It is Figure 2 It is an enlarged schematic view of A in the utility model;

[0020] Figure 4 It is Figure 2 It is a structural schematic view of the DC contactor shown in the utility model after removing the positioning frame;

[0021] Figure 5 This is a three-dimensional schematic diagram of the body of the bipolar high-voltage DC contactor in this utility model;

[0022] Figure 6 for Figure 5 The diagram shows the structure of a double-pole high-voltage DC contactor after removing the stationary contact mounting bracket and terminal blocks.

[0023] Figure 7 This is a three-dimensional schematic diagram of the stationary contact assembly in this utility model;

[0024] Figure 8 This is a structural diagram showing the interaction between the drive rod and the moving contact assembly in this utility model.

[0025] Figure 9 for Figure 8 A front view of the assembly shown;

[0026] Figure 10 For along Figure 9 A sectional view cut along the BB line.

[0027] The reference numerals in the figure are as follows: 1. Housing; 11. Terminal hole; 2. Contactor body; 21. Electromagnetic drive mechanism; 211. Drive rod; 212. Wire; 22. Moving contact assembly; 221. Moving contact mounting bracket; 2211. Limiting hole; 222. Moving contact; 2221. Mounting hole; 23. Stationary contact assembly; 231. Stationary contact mounting bracket; 2311. Notch; 2312. Positioning groove; 2313. Limiting plate; 2314. Contact chamber; 232. Stationary contact; 24. First spring; 25. Support frame; 251. Abutment rod; 26. Accommodating space; 27. Magnet; 28. Positioning frame; 281. Positioning hole; 282. Lead wire positioning groove; 29. ​​Terminal block; 3. Limiting shaft; 30. Limiting end; 31. Second spring; 32. Limiting component; 4. Hollow housing; 5. Air extraction pipe; 6. Auxiliary switch. Detailed Implementation

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0030] The structure of the bipolar high-voltage DC contactor in this embodiment of the utility model is as follows: Figures 1 to 10As shown, the device includes a housing 1 and a contactor body 2 disposed within the housing 1. The housing 1 is a plastic housing. The contactor body 2 includes an electromagnetic drive mechanism 21, a moving contact assembly 22, and a stationary contact assembly 23. The electromagnetic drive mechanism 21 has a telescopic drive rod 211. The moving contact assembly 22 includes a moving contact mounting bracket 221 and a moving contact 222 mounted on the moving contact mounting bracket 221. The moving contact mounting bracket 221 is mounted on the drive rod 211. The stationary contact assembly 23 includes a stationary contact mounting bracket 231 and a stationary contact 232 mounted on the stationary contact mounting bracket 231. The stationary contact 232 is opposite to the moving contact 222. When the electromagnetic drive mechanism 21 moves the drive rod 211, it moves the moving contact assembly 22 relative to the stationary contact assembly 23. When the moving contact 222 contacts the stationary contact 232, the control circuit is turned on. When the moving contact 222 separates from the stationary contact 232, the control circuit is turned off.

[0031] To enable simultaneous control of two DC circuits, the moving contact mounting bracket 221 is equipped with two moving contacts 222, and the stationary contact mounting bracket 231 is equipped with stationary contacts 232 at both ends corresponding to each moving contact 222. This structural design allows each moving contact 222 to form an electrical connection with two stationary contacts 232. The circuit will only be turned on when the moving contact 222 is in contact with its two corresponding stationary contacts 232 at the same time.

[0032] The moving contact mounting bracket 221 is movably sleeved on the drive rod 211, allowing the moving contact mounting bracket 221 to move axially relative to the drive rod 211. A first spring 24 is mounted on the drive rod 211, providing elastic force to the moving contact 222 to maintain a tendency to move towards the stationary contact 232. Thus, when the moving contact 222 on the moving contact mounting bracket 221 is moved towards the stationary contact 232 by the drive rod 211, and when the moving contact 222 contacts the stationary contact 232, the first spring 24 can act as a buffer, reducing contact impact, improving contact stability, and ensuring good contact between the moving contact 222 and the stationary contact 232.

[0033] Furthermore, each moving contact 222 is movably connected to the moving contact mounting bracket 221 via an elastic connection structure. Under normal conditions, under the elastic force of the elastic connection structure, the side of the moving contact 222 facing away from the stationary contact 232 rests against the moving contact mounting bracket 221. Thus, the moving contact mounting bracket 221 can support the moving contact 222, ensuring the stable position of the moving contact 222. It also allows for adaptive fine-tuning as needed when in contact with the stationary contact 232 to accommodate possible assembly or processing errors. This improves the contact effect and electrical conductivity between the moving contact 222 and the stationary contact 232, ensuring that poor contact caused by errors can be effectively avoided in practical applications.

[0034] For details, please refer to Figure 10 As shown, the above-mentioned elastic connection structure includes a limiting shaft 3, a second spring 31, and a limiting member 32; the moving contact mounting bracket 221 is provided with a limiting through hole 2211 in the same direction as the drive rod 211, and the moving contact 222 is provided with a mounting through hole 2221 aligned with the limiting through hole 2211. The limiting shaft 3 passes through the limiting through hole 2211 and the mounting through hole 2221 and cooperates with the limiting member 32 to movably mount the moving contact 222 on the moving contact mounting bracket 221. The second spring 31 provides elastic force to the limiting shaft 3 so that the moving contact 222 faces away from the stationary contact. One side of the moving contact 222 rests against the moving contact mounting bracket 221, so the elastic force of the second spring 31 allows the moving contact 222 to rest stably against the moving contact mounting bracket 221 in the working state, and to return to its original position in time after separating from the stationary contact 232; the limiting member 32 can be a snap ring or a snap pin, and the limiting member 32 is fixed to the limiting shaft 3 by snap-fit; in this scheme, the limiting shaft 3, the second spring 31 and the limiting member 32 cooperate to ensure that the moving contact 222 can move flexibly during dynamic operation without losing the necessary support and stability, thereby ensuring the stability of the structure.

[0035] Furthermore, the end of the limiting shaft 3 away from the stationary contact 232 is provided with a limiting end 30, and a step is formed on the limiting end 30 to accommodate the installation of the second spring 31. The limiting member 32 is fixed on the end of the limiting shaft 3 near the stationary contact 232. The second spring 31 is sleeved on the limiting shaft 3, and its two ends abut against the limiting end 30 and the moving contact mounting bracket 221 respectively, thus realizing the limiting installation of the second spring 31.

[0036] See Figures 8 to 10As shown, in order to ensure the stability of the structure, it is preferable to set two moving contacts 222 on the moving contact mounting bracket 221 in a centrally symmetrical arrangement about the drive rod 211; the centrally symmetrical arrangement of the two moving contacts 222 can effectively balance the force acting on the drive rod 211. When the drive rod 211 moves, the two moving contacts 222 will evenly bear the force from the stationary contact 232, enhancing the stability of the action.

[0037] like Figure 7 As shown, an auxiliary switch 6 is mounted on the stationary contact mounting bracket 231. When the moving contact 222 is in contact with the stationary contact 232, the drive rod 211 triggers the auxiliary switch 6. When the moving contact 222 is separated from the stationary contact 232, the drive rod 211 does not trigger the auxiliary switch 6. This structural design can expand the function of the DC contactor. For example, in practical applications, the auxiliary switch 6 can be connected to an external status indication circuit. In this way, when the auxiliary switch 6 is triggered, the signal can be transmitted through the external status indication function, so that the operator can understand the on / off status of the DC contactor in a timely manner. The auxiliary switch 6 is preferably a micro switch, and the auxiliary switch 6 can be embedded and fixed on the stationary contact mounting bracket 231.

[0038] See Figure 5 As shown, a support frame 25 is fixedly connected to the electromagnetic drive mechanism 21, opposite to the stationary contact mounting bracket 231. A receiving space 26 is formed between the support frame 25 and the stationary contact mounting bracket 231, and the moving contact assembly 22 and the stationary contact 232 are located within the receiving space 26. A magnet 27 is installed on the stationary contact mounting bracket 231 near the stationary contact 232. During the operation of the DC contactor, an electric arc will occur when the stationary contact 232 separates from the moving contact 222. The presence of the electric arc will affect the breaking capacity of the DC contactor. The magnetic field generated by the magnetic field 27 can form a magnetic blow-out effect, thereby accelerating the electric arc away from the moving contact 222 and the stationary contact 232, which is conducive to extinguishing the electric arc and thus improving the performance of the DC contactor.

[0039] Furthermore, such as Figure 5 and Figure 6 As shown, in order to facilitate the quick and reliable installation of the magnet 27, a positioning groove 2312 with an opening facing the support frame 25 is provided on the stationary contact mounting bracket 231. The magnet 27 is embedded in the positioning groove 2312. The support frame 25 is provided with an abutment rod 251 extending into the positioning groove 2312. The end of the abutment rod 251 abuts against the magnet 27. The magnet 27 is reliably fixed in the positioning groove 2312 by the abutment generated by the abutment rod 251 against the magnet 27.

[0040] like Figure 1 , Figure 2 andFigure 4 As shown, the DC contactor also includes a hollow housing 4, which is installed inside the outer shell 1. The hollow housing 4 can be made of metal. One end of the hollow housing 4 is closed, and the other end is open. The contactor body 2 is installed into the hollow housing 4 through the open end. The stationary contact mounting bracket 231 closes the open end. Glue can be applied to the stationary contact mounting bracket 231 to ensure the sealing of this open end. An air extraction pipe 5 is installed on the stationary contact mounting bracket 231. The inner end of the air extraction pipe 5 is connected to the accommodating space 26, and the outer end of the air extraction pipe 5 extends to the outside of the outer shell 1. During use, air can be sucked out of the accommodating space 26 through the air extraction pipe 5. After the air is sucked out, the outer end of the air extraction pipe 5 is sealed, creating a vacuum state in the accommodating space 26. This vacuum state is also conducive to arc extinguishing, thereby improving the performance of the DC contactor.

[0041] Combination Figure 2 and Figure 3 As shown, inside the housing 1, on the side of the stationary contact mounting bracket 231 facing away from the electromagnetic drive mechanism 21, a positioning bracket 28 is also provided. The positioning bracket 28 has a positioning hole 281, through which the air extraction pipe 5 passes. The positioning bracket 28 has a lead wire positioning groove 282, and the wire 212 connected to the electromagnetic drive mechanism 21 is snapped into the lead wire positioning groove 282 and led out through the wire hole on the housing 1. The stationary contact mounting bracket 231 is equipped with a terminal post 29 that is fixedly connected to each stationary contact 232. The housing 1 has a terminal post through hole 11 for the terminal post 29 to pass through. The terminal post 29 is electrically connected to the external main circuit. The positioning bracket 28 can position the wire 212 and the air extraction pipe 5.

[0042] like Figure 7 As shown, the stationary contact mounting bracket 231 is provided with a limiting plate 2313 protruding towards the positioning bracket 28. A contact chamber 2314 is formed inside the limiting plate 2313. Each moving contact 222 and two stationary contacts 232 corresponding to the moving contact 222 are located in the contact chamber 2314. A notch 2311 is provided on the side of the limiting plate 2313 for the moving contact mounting bracket 221 to extend into. The presence of the limiting plate 2313 can limit the moving contact 222, prevent the moving contact 33 from deflecting, and keep the moving contact 33 and the stationary contact 232 in a relative state, thus ensuring the stability of the product.

[0043] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the protection scope of this invention.

Claims

1. A double-pole high-voltage DC contactor, comprising a housing (1) and a contactor body (2) disposed within the housing (1); the contactor body (2) comprises an electromagnetic drive mechanism (21), a moving contact assembly (22) and a stationary contact assembly (23). The electromagnetic drive mechanism (21) has a telescopic drive rod (211); the moving contact assembly (22) includes a moving contact mounting bracket (221) and a moving contact (222) mounted on the moving contact mounting bracket (221), the moving contact mounting bracket (221) being mounted on the drive rod (211); the stationary contact assembly (23) includes a stationary contact mounting bracket (231) and a stationary contact (232) mounted on the stationary contact mounting bracket (231), the stationary contact (232) being opposite to the moving contact (222); Its features are: The moving contact mounting bracket (221) is equipped with two moving contacts (222), and the stationary contact mounting bracket (231) is equipped with stationary contacts (232) at both ends corresponding to each moving contact (222). The moving contact mounting bracket (221) is movably sleeved on the drive rod (211), and a first spring (24) is installed on the drive rod (211). The first spring (24) provides elastic force to the moving contact (222) so that the moving contact (222) maintains the tendency to move towards the stationary contact (232). Each moving contact (222) is movably connected to the moving contact mounting bracket (221) through an elastic connection structure. Under normal conditions, under the elastic force of the elastic connection structure, the side of the moving contact (222) facing away from the stationary contact (232) is against the moving contact mounting bracket (221).

2. The bipolar high-voltage DC contactor according to claim 1, characterized in that: The elastic connection structure includes a limiting shaft (3), a second spring (31), and a limiting member (32); the moving contact mounting bracket (221) is provided with a limiting through hole (2211) in the same direction as the drive rod (211), and the moving contact (222) is provided with a mounting through hole (2221) aligned with the limiting through hole (2211). The limiting shaft (3) passes through the limiting through hole (2211) and the mounting through hole (2221) and cooperates with the limiting member (32) to movably mount the moving contact (222) on the moving contact mounting bracket (221). The second spring (31) provides elastic force to the limiting shaft (3) so that the side of the moving contact (222) facing away from the stationary contact (232) abuts against the moving contact mounting bracket (221).

3. The bipolar high-voltage DC contactor according to claim 2, characterized in that: The limiting shaft (3) has a limiting end (30) at one end away from the stationary contact (232). The limiting member (32) is fixed on the limiting shaft (3) at one end near the stationary contact (232). The second spring (31) is sleeved on the limiting shaft (3) and its two ends abut against the limiting end (30) and the moving contact mounting bracket (221) respectively.

4. The bipolar high-voltage DC contactor according to claim 1, characterized in that: Two moving contacts (222) are arranged symmetrically about the drive rod (211) on the moving contact mounting bracket (221).

5. The bipolar high-voltage DC contactor according to claim 1, characterized in that: An auxiliary switch (6) is mounted on the stationary contact mounting bracket (231). When the moving contact (222) is in contact with the stationary contact (232), the drive rod (211) triggers the auxiliary switch (6). When the moving contact (222) is separated from the stationary contact (232), the drive rod (211) does not trigger the auxiliary switch (6).

6. The bipolar high-voltage DC contactor according to claim 1, characterized in that: The electromagnetic drive mechanism (21) is fixedly connected to a support frame (25) opposite to the stationary contact mounting frame (231). A receiving space (26) is formed between the support frame (25) and the stationary contact mounting frame (231). The moving contact assembly (22) and the stationary contact (232) are located in the receiving space (26). A magnet (27) is installed on the stationary contact mounting frame (231) near the stationary contact (232).

7. The bipolar high-voltage DC contactor according to claim 6, characterized in that: The stationary contact mounting bracket (231) is provided with a positioning groove (2312) with an opening in the direction of the support frame (25). The magnet (27) is embedded in the positioning groove (2312). The support frame (25) is provided with an abutment rod (251) extending into the positioning groove (2312). The end of the abutment rod (251) abuts against the magnet (27).

8. The bipolar high-voltage DC contactor according to claim 6, characterized in that: The DC contactor also includes a hollow housing (4) installed inside the outer casing (1). One end of the hollow housing (4) is closed and the other end is open. The contactor body (2) is installed into the hollow housing (4) through the open end. The stationary contact mounting bracket (231) closes the open end and is equipped with an exhaust pipe (5). The inner end of the exhaust pipe (5) is connected to the accommodating space (26), and the outer end of the exhaust pipe (5) extends to the outside of the outer casing (1).

9. The bipolar high-voltage DC contactor according to claim 8, characterized in that: Inside the housing (1), on the side of the stationary contact mounting bracket (231) facing away from the electromagnetic drive mechanism (21), a positioning bracket (28) is also provided. The positioning bracket (28) has a positioning hole (281), and the air extraction pipe (5) passes through the positioning hole (281). The positioning bracket (28) has a lead wire positioning groove (282), and the wire (212) connected to the electromagnetic drive mechanism (21) is snapped into the lead wire positioning groove (282) and led out through the wire hole on the housing (1). The stationary contact mounting bracket (231) is equipped with a terminal post (29) that is fixedly connected to each stationary contact (232), and the housing (1) has a terminal post through hole (11) for the terminal post (29) to pass through.

10. The bipolar high-voltage DC contactor according to claim 1, characterized in that: The stationary contact mounting bracket (231) is provided with a limiting plate (2313) protruding towards the positioning bracket (28). A contact chamber (2314) is formed inside the limiting plate (2313). Each moving contact (222) and two stationary contacts (232) corresponding to the moving contact (222) are located in the contact chamber (2314). A notch (2311) is provided on the side of the limiting plate (2313) for the moving contact mounting bracket (221) to extend into.

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