Moving contact holder, push rod assembly and high voltage DC contactor

Abstract

The utility model relates to the technical field of electrical components and discloses a movable contact support, a push rod assembly and a high-voltage direct-current contactor, wherein the movable contact support comprises a mounting frame and a movable seat, the mounting frame is used for connecting the push rod and has a first limiting part and a first mounting wall, the first limiting part is arranged at intervals with the first mounting wall, the movable seat is movably connected with the mounting frame and is used for mounting the movable contact, the movable seat has a second limiting part, the second limiting part is located between the first limiting part and the first mounting wall and can be moved to abut against the first mounting wall or the first limiting part, the distance of the movable contact is limited, the generation of an electric arc is inhibited, and the short-circuit resistance of the high-voltage direct-current contactor is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical component technology, and in particular to a moving contact bracket, a push rod assembly, and a high-voltage DC contactor. Background Technology

[0002] With the development of new energy technologies such as new energy vehicles, charging piles, and energy storage, DC high-voltage contactors, as electrical control components of the high-voltage main circuit of products, are being used more and more widely.

[0003] The push rod assembly of a high-voltage DC contactor is the core transmission component connecting the electromagnetic system and the contact system. Its core function is to convert electromagnetic attraction into linear motion. The push rod assembly includes a push rod and a moving contact bracket connected together. The push rod is connected to the electromagnetic system and moves synchronously with the moving contact bracket. The moving contact bracket installs the moving contact and drives the moving contact to move, thus realizing contact and conduction between the moving and stationary contacts.

[0004] When a short circuit or overload occurs in the circuit connected to the DC high voltage contactor, the large current generated in the circuit will increase the electric repulsion between the moving and stationary contacts. If the moving and stationary contacts are allowed to be repelled, an electric arc will be generated between the moving and stationary contacts, which will quickly generate a large amount of heat and cause damage to the high voltage DC contactor. Utility Model Content

[0005] The main purpose of this invention is to provide a push rod assembly that aims to suppress the generation of electric arc between moving and stationary contacts and enhance the short-circuit resistance of high-voltage DC contactors.

[0006] To achieve the above objectives, the present invention proposes a moving contact bracket for connecting a push rod and mounting a moving contact, the moving contact bracket comprising: A mounting bracket, the mounting bracket being used to connect the push rod and having a first limiting portion and a first mounting wall, the first limiting portion and the first mounting wall being spaced apart; and The movable seat is movably connected to the mounting bracket and used to mount the moving contact. The movable seat has a second limiting part located between the first limiting part and the first mounting wall, and can move to a stop and abut against the first mounting wall or the first limiting part.

[0007] In one embodiment, the movable seat has a receiving groove; The receiving groove is used to install the moving contact, and the opposite side walls of the receiving groove are folded back to form the second limiting part.

[0008] In one embodiment, the mounting bracket includes an outer support and a limiting support; The outer bracket is used to connect the push rod; The limiting bracket is connected to the outer bracket and located inside the outer bracket. The limiting bracket has the first mounting wall and the first limiting part.

[0009] In one embodiment, the limiting bracket includes a connecting section, an extension section, and a folding section connected in sequence; One side wall of the connecting segment is connected to the inner side wall of the outer bracket, and the other side wall of the connecting segment forms the first mounting wall; The extension section connects to the connecting section and is set at an angle to the first mounting wall; The folding section connects to the extension section and is set at an angle to the extension section, and the side of the folding section facing the first mounting wall forms the first limiting part.

[0010] In one embodiment, the limiting bracket is riveted to the outer bracket.

[0011] In one embodiment, the moving contact support further includes a spring, and the mounting bracket has a second mounting wall; The second mounting wall is disposed opposite to the first mounting wall; The two ends of the spring are respectively connected to the second mounting wall and the movable seat.

[0012] In one embodiment, the mounting bracket has a mounting ring groove; The mounting groove is formed in the second mounting wall, and the bottom wall of the mounting groove abuts against the spring.

[0013] In one embodiment, the movable seat has a limiting boss that protrudes from the side of the movable seat toward the second mounting wall, and one end of the spring is sleeved on the limiting boss; and / or The movable seat has multiple limiting protrusions, each of which protrudes from the side of the movable seat toward the second mounting wall and abuts against the outer side wall of one end of the spring.

[0014] This utility model also proposes a push rod assembly for connecting an electromagnetic system and installing a moving contact, the push rod assembly comprising: The moving contact bracket is used to mount the moving contact; and A push rod, which is connected to the moving contact bracket and used to connect to the electromagnetic system.

[0015] This utility model also proposes a high-voltage DC contactor, which includes: The housing has an arc-extinguishing cavity; The push rod assembly is disposed in the housing; A contact system, at least partially located in the arc-extinguishing cavity and comprising a moving contact and a stationary contact, the moving contact being connected to the push rod assembly and the stationary contact being connected to the housing; and An electromagnetic system is disposed in the housing and connected to the push rod assembly, and is used to drive the push rod assembly to move so that the stationary contact and the moving contact make contact.

[0016] In the technical solution of this utility model, the mounting bracket limits the range of motion of the first limiting part and the first mounting wall. The second limiting part is located between the first limiting part and the first mounting wall and can only move within this range of motion, thereby limiting the range of motion of the moving contact mounted on the movable seat. In the event of a short circuit or overload, the moving and stationary contacts separate under the action of electric repulsion. The moving contact pushes the movable seat to move. However, the movable seat is limited by the range of motion of the second limiting part, and the moving contact can only move to the position where the corresponding second limiting part abuts against the first limiting part. By limiting the spring-off distance of the moving contact, the generation of electric arc is suppressed, thereby improving the short-circuit resistance of the high-voltage DC contactor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the moving contact bracket provided by this utility model; Figure 2 for Figure 1 The exploded structure diagram of the embodiment is shown in the figure.

[0019] Explanation of icon numbers: 1000, Actuator assembly; 100, Actuator; 200, Moving contact; 300. Moving contact bracket; 1. Mounting bracket; 11. First limiting part; 12. First mounting wall; 13. Outer bracket; 14. Limiting bracket; 141. Connecting section; 142. Extension section; 143. Folding section; 15. Second mounting wall; 16. Mounting ring groove; 2. Movable seat; 21. Second limiting part; 22. Receiving groove; 23. Limiting boss; 24. Limiting protrusion; 3. Spring; a. Riveting joint.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0024] This utility model proposes a moving contact support 300. Figures 1 to 2 This is one embodiment of the present utility model.

[0025] In this embodiment of the utility model, the moving contact bracket 300 includes a mounting frame 1 and a movable seat 2. The mounting frame 1 is used to connect the push rod 100 and has a first limiting part 11 and a first mounting wall 12. The first limiting part 11 and the first mounting wall 12 are spaced apart. The movable seat 2 is movably connected to the mounting frame 1 and is used to install the moving contact 200. The movable seat 2 has a second limiting part 21. The second limiting part 21 is located between the first limiting part 11 and the first mounting wall 12 and can move to limit and abut against the first mounting wall 12 or the first limiting part 11.

[0026] In the technical solution of this utility model, the mounting bracket 1 is limited in its range of motion by the first limiting part 11 and the first mounting wall 12. The second limiting part 21, located between the first limiting part 11 and the first mounting wall 12, can only move within this range of motion, thereby limiting the range of motion of the moving contact 200 mounted on the movable seat 2. In the event of a short circuit or overload, the moving and stationary contacts separate under the action of electric repulsion. The moving contact 200 pushes the movable seat 2 to move, while the movable seat 2 is limited by the range of motion of the second limiting part 21. The moving contact 200 can only move to the position where the second limiting part 21 abuts against the first limiting part 11. By limiting the spring-off distance of the moving contact 200, the generation of electric arc is suppressed, thereby improving the short-circuit resistance capability of the high-voltage DC contactor.

[0027] In one embodiment, the movable seat 2 has a receiving groove 22 for mounting the moving contact 200. The opposite side walls of the receiving groove 22 are folded back to form the second limiting part 21. The connection and installation between the moving contact 200 and the movable seat 2 are specifically realized through the receiving groove 22. Furthermore, based on the original receiving groove 22, the second limiting part 21 is formed by folding the groove wall of the receiving groove 22. That is, the second limiting part 21 is integrally formed with the movable seat 2, eliminating the need for additional limiting structures, reducing production difficulty, and simplifying the production process.

[0028] In one embodiment, the mounting frame 1 includes an outer support 13 and a limiting support 14. The outer support 13 is used to connect the push rod 100, and the limiting support 14 is connected to the outer support 13 and located inside the outer support 13. The limiting support 14 forms the first mounting wall 12 and the first limiting portion 11. The mounting frame 1 is divided into the outer support 13 and the limiting support 14. The outer support 13 generally serves to accommodate the moving contact 200 and connect the push rod 100, while the limiting support 14 connects to the outer support 13 and provides a limiting function for the movement of the moving contact 200. Generally, due to functional and structural limitations, the outer support 13 is not suitable for directly setting the first limiting portion 11 on both side walls. Therefore, the above-mentioned solution of dividing the mounting frame 1 into the outer support 13 and the limiting support 14 can enable the mounting frame 1 to have a limiting function without affecting the normal production process of the original outer support 13, thereby achieving the technical effect of improving the short-circuit withstand capability of the high-voltage DC contactor.

[0029] In one embodiment, the limiting bracket 14 includes a connecting segment 141, an extension segment 142, and a folding segment 143 connected in sequence. One side wall of the connecting segment 141 is connected to the inner side wall of the outer bracket 13, and the other side wall of the connecting segment 141 forms the first mounting wall 12. The extension segment 142 connects to the connecting segment 141 and is set at an angle to the first mounting wall 12. The folding segment 143 connects to the extension segment 142 and is set at an angle to the extension segment 142. The side of the folding segment 143 facing the first mounting wall 12 forms the first limiting portion 11. Through the two included angles between the connecting segment 141 and the extension segment 142 and between the extension segment 142 and the folding segment 143, plus the limiting effect of the inner wall of the outer bracket 13, the upper side wall of the folding segment 143 can be opposite to the first mounting wall 12 of the connecting segment 141, forming a space between the folding segment 143 and the first mounting wall 12 for limiting the second limiting portion 21.

[0030] Ideally, the folding section 143 and the first mounting wall 12 should be parallel, meaning the angle between the connecting section 141 and the extension section 142 should be 90°, and the angle between the extension section 142 and the bending section should also be 90°. The angle between the folding section 143 and the first mounting wall 12 can have a certain range, as long as it is sufficient to achieve the limiting effect on the second limiting part 21.

[0031] The connection method between the limiting bracket 14 and the outer bracket 13 is not limited; it can be glued, welded, etc., all of which can achieve the connection and fixation between the two.

[0032] In one embodiment, such as Figure 2 As shown, the limiting bracket 14 is riveted to the outer bracket 13. The limiting bracket 14 and the outer bracket 13 are connected by riveting, which is firm and not easily damaged. As can be seen at the riveting point a in the figure, the limiting bracket 14 is provided with multiple rivets for positioning, and the outer bracket 13 has multiple rivet holes. The rivets are first matched with the rivet holes, and then riveting is performed. This allows the relative positions of the limiting bracket 14 and the outer bracket 13 to be determined during manufacturing. After connection, the relative positions between the two are determined by the rivets, preventing significant differences in the positions of the outer bracket 13 and the limiting bracket 14 of different mounting brackets 1 due to human error, thus ensuring production consistency.

[0033] In one embodiment, the moving contact bracket 300 further includes a spring 3. The mounting bracket 1 has a second mounting wall 15, which is disposed opposite to the first mounting wall 12. The two ends of the spring 3 are respectively connected to the second mounting wall 15 and the movable seat 2. The spring 3 connects the second mounting wall 15 and the movable seat 2, providing certain support and buffering for the movable seat 2. After the moving contact 200 disconnects from the stationary contact, under the electric repulsion between the moving and stationary contacts and the action of the electromagnetic system, the moving contact 200 is springed back, and the moving contact 200 and the movable seat 2 move together. The spring 3 plays a good buffering role, preventing the movable seat 2 from colliding with other structures and preventing the second limiting member from colliding with the first limiting member. When the electromagnetic system is energized and attracted, under the action of the push rod 100, the movable seat 2 moves upward and makes the moving contact 200 contact the stationary contact. The spring 3 can provide buffering for the contact between the moving contact 200 and the stationary contact.

[0034] In one embodiment, the mounting bracket 1 has a mounting annular groove 16 formed on the second mounting wall 15, and the bottom wall of the mounting annular groove 16 abuts against the spring 3. The mounting annular groove 16 on the second mounting wall 15 of the mounting bracket 1 provides a mounting position for the spring 3 and limits its movement. Specifically, the inner and outer annular walls of the mounting annular groove 16 limit the inner and outer annular walls of the spring 3, respectively, preventing the spring 3 from moving laterally and failing.

[0035] To further prevent the spring 3 from failing due to movement, the end of the spring 3 that contacts the movable seat 2 is restricted. Firstly, the movable seat 2 has a limiting boss 23, which protrudes from the side of the movable seat 2 toward the second mounting wall 15. One end of the spring 3 is sleeved on the limiting boss 23, which limits the spring 3. When the spring 3 has a tendency to move laterally or when it moves to a certain extent, the outer peripheral wall of the limiting boss 23 will abut against the spring 3 to restrict the spring 3 from moving further. The limiting boss 23 also provides a positioning function for the installation of the spring 3. Secondly, the movable seat 2 has multiple limiting protrusions 24, each of which protrudes from the side of the movable seat 2 toward the second mounting wall 15 and abuts against the outer side wall of one end of the spring 3. The limiting protrusions 24 limit the spring 3, restricting the displacement of the end of the spring 3 connected to the movable seat 2, ensuring the direction of the spring force, and ensuring the normal functioning of the spring 3.

[0036] In one embodiment, the movable seat 2 simultaneously has the limiting boss 23 and the limiting protrusion 24, and correspondingly possesses the technical effects of both. While the limiting structure of the spring 3 is not restricted, at the end where the spring 3 abuts against the movable seat 2, since the movable seat 2 carries the moving contact 200, its volume cannot be too large. This would affect the movable space of the movable seat 2, and a larger volume would represent a larger mass, making the spring 3 more prone to fatigue. If the movable seat 2 uses the same slotting method as the second mounting wall 15 to restrict the movement of the spring 3 while maintaining the original dimensions of the movable seat 2, the strength of the movable seat 2 would be greatly reduced. Therefore, the solution using the limiting boss 23 and the limiting protrusion 24 is the preferred solution.

[0037] This utility model also proposes a push rod assembly 1000, such as Figure 1 and Figure 2 As shown, the push rod assembly 1000 is used to connect to an electromagnetic system and includes the moving contact bracket 300 and the push rod 100. The moving contact bracket 300 is used to mount the moving contact 200, and the push rod 100 is connected to the moving contact bracket 300 and used to connect to the electromagnetic system. The push rod 100 is used to transmit the movement of the electromagnetic system and drive the moving contact bracket 300 and the moving contact 200 to move, so as to realize the contact between the moving and stationary contacts. Since the push rod assembly 1000 includes the moving contact bracket 300, the structure of which is as described in the above embodiments. Since this push rod assembly 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0038] This utility model also proposes a high-voltage DC contactor, which includes a housing, a push rod assembly 1000, a contact system, and an electromagnetic system. The housing has an arc-extinguishing cavity. The push rod assembly 1000 is disposed in the housing. The contact system is at least partially located in the arc-extinguishing cavity and includes a moving contact 200 and a stationary contact. The moving contact 200 is connected to the push rod assembly 1000, and the stationary contact is connected to the housing. The electromagnetic system is disposed in the housing and connected to the push rod assembly 1000, and is used to drive the push rod assembly 1000 to move, so that the stationary contact and the moving contact 200 make contact. In the event of a short circuit or overload, the moving contact 200 of the contact system is retracted. The retraction range of the moving contact 200 is limited by the moving contact bracket 300, thereby suppressing the generation of an electric arc between the moving and stationary contacts. In addition, the arc-extinguishing cavity of the housing provides further protection. Therefore, the high-voltage DC contactor has the characteristic of strong short-circuit resistance. Since the high-voltage DC contactor includes the push rod assembly 1000, the specific structure of which is as described in the above embodiments. Since this high-voltage DC contactor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A moving contact bracket for connecting a push rod and mounting a moving contact, characterized in that, The moving contact support includes: A mounting bracket, the mounting bracket being used to connect the push rod and having a first limiting portion and a first mounting wall, the first limiting portion and the first mounting wall being spaced apart; and The movable seat is movably connected to the mounting bracket and used to mount the moving contact. The movable seat has a second limiting part located between the first limiting part and the first mounting wall, and can move to a stop and abut against the first mounting wall or the first limiting part.

2. The moving contact bracket as described in claim 1, characterized in that, The movable seat has a receiving groove; The receiving groove is used to install the moving contact, and the opposite side walls of the receiving groove are folded back to form the second limiting part.

3. The moving contact bracket as described in claim 1, characterized in that, The mounting bracket includes an outer bracket and a limiting bracket; The outer bracket is used to connect the push rod; The limiting bracket is connected to the outer bracket and located inside the outer bracket. The limiting bracket has the first mounting wall and the first limiting part.

4. The moving contact bracket as described in claim 3, characterized in that, The limiting bracket includes a connecting section, an extension section, and a folding section connected in sequence. One side wall of the connecting segment is connected to the inner side wall of the outer bracket, and the other side wall of the connecting segment forms the first mounting wall; The extension section connects to the connecting section and is set at an angle to the first mounting wall; The folding section connects to the extension section and is set at an angle to the extension section, and the side of the folding section facing the first mounting wall forms the first limiting part.

5. The moving contact bracket as described in claim 3, characterized in that, The limiting bracket is riveted to the outer bracket.

6. The moving contact bracket as described in any one of claims 1 to 5, characterized in that, The moving contact bracket also includes a spring, and the mounting bracket has a second mounting wall; The second mounting wall is disposed opposite to the first mounting wall; The two ends of the spring are respectively connected to the second mounting wall and the movable seat.

7. The moving contact bracket as described in claim 6, characterized in that, The mounting bracket has a mounting ring groove; The mounting groove is formed in the second mounting wall, and the bottom wall of the mounting groove abuts against the spring.

8. The moving contact bracket as described in claim 6, characterized in that, The movable seat has a limiting boss that protrudes from the side of the movable seat toward the second mounting wall, and one end of the spring is sleeved on the limiting boss; and / or The movable seat has multiple limiting protrusions, each of which protrudes from the side of the movable seat toward the second mounting wall and abuts against the outer side wall of one end of the spring.

9. A push rod assembly for connecting an electromagnetic system and mounting a moving contact, characterized in that, The push rod assembly includes: The moving contact bracket as described in any one of claims 1 to 8, wherein the moving contact bracket is used to mount the moving contact; and A push rod, which is connected to the moving contact bracket and used to connect to the electromagnetic system.

10. A high-voltage DC contactor, characterized in that, The high-voltage DC contactor includes: The housing has an arc-extinguishing cavity; The push rod assembly as claimed in claim 9, wherein the push rod assembly is disposed in the housing; A contact system, at least partially located in the arc-extinguishing cavity and comprising a moving contact and a stationary contact, the moving contact being connected to the push rod assembly and the stationary contact being connected to the housing; and An electromagnetic system is disposed in the housing and connected to the push rod assembly, and is used to drive the push rod assembly to move so that the stationary contact and the moving contact make contact.

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