Low noise DC contactor

Abstract

The utility model discloses a low noise direct current contactor, including magnetic pole piece and push rod group, and push rod group includes push rod, and push rod is worn in magnetic pole piece, and the portion of push rod group is set up with elastic buffer between magnetic pole piece above magnetic pole piece, and elastic buffer includes at least one contact part and two base parts, and contact part sets up between two base parts and position is relatively on or under, to make contact part with two base parts between the length direction of push rod exist height difference, and contact part is also distributed in the side of push rod simultaneously, both ends of contact part all are provided with buffer part, and buffer part is fixedly connected with corresponding base part, when push rod group switches to initial state from push out state, and elastic buffer can provide the buffer to the impact of push rod group through self elastic deformation. The utility model utilizes elastic buffer self elastic deformation to provide the buffer to the impact of push rod group, and the noise that push rod group and magnetic pole piece collide has been reduced significantly.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic relay technology, and in particular to a low-noise DC contactor. Background Technology

[0002] DC contactors, as an important electrical control component, are widely used in many fields, especially playing a key role in the new energy vehicle industry. New energy vehicles rely on electric power, and their high-voltage circuit systems require DC contactors to connect and disconnect the circuits and control the current, ensuring the normal operation of the vehicle.

[0003] However, with the development of new energy vehicle technology, users have placed higher demands on vehicle comfort and quietness. Against this backdrop, the noise problem generated by DC contactors during operation has become increasingly prominent. During the operation of new energy vehicles, DC contactors operate frequently, with the movement of the push rod assembly being particularly critical. When the DC contactor is energized, the magnetic field generated by the coil excitation drives the moving iron core towards the stationary iron core until it is attracted to it. During this process, the moving iron core pushes the moving contact plate to connect with the stationary contact via the push rod assembly. When the DC contactor is de-energized, both the contact spring and the return spring are released, causing the moving iron core to separate from the stationary iron core. At this time, the push rod assembly impacts the magnetic pole piece, generating a significant impact and thus causing noticeable noise. This noise not only affects the riding experience of passengers and reduces vehicle comfort, but in the long run, it can also damage the performance and lifespan of the DC contactor itself. Therefore, it is necessary to improve the existing technology to overcome its shortcomings. Utility Model Content

[0004] The problem to be solved by this utility model is to provide a low-noise DC contactor to overcome the defect of existing DC contactors that generate large noise when the push rod group hits the magnetic pole piece when disconnected.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a low-noise DC contactor, including a magnetic pole piece and a push rod assembly. The push rod assembly includes a push rod that passes through the magnetic pole piece. The push rod assembly has two states: an initial state where it is stopped on the magnetic pole piece and an extended state where it has moved away from the magnetic pole piece and is in position. An elastic buffer is provided between the portion of the push rod assembly above the magnetic pole piece and the magnetic pole piece. The elastic buffer includes at least one contact portion and two base portions. The contact portion is located between the two base portions and is positioned relatively higher or lower, so that there is a height difference between the contact portion and the two base portions along the length direction of the push rod. The contact portion is also distributed on the side of the push rod. Buffer portions are provided at both ends of the contact portion, and the buffer portions are fixedly connected to the corresponding base portions. When the push rod assembly switches from the extended state to the initial state, the elastic buffer can provide buffering against the impact of the push rod assembly through its own elastic deformation.

[0006] As a further improvement of this utility model, the contact portion is used to abut against the push rod assembly, the buffer portion is used to generate elastic deformation to provide buffering, and the base portion is used to support the top surface of the magnetic pole piece;

[0007] Alternatively, the base portion is used to abut against the push rod assembly, the buffer portion is used to generate elastic deformation to provide cushioning, and the contact portion is used to support the top surface of the magnetic pole piece.

[0008] As a further improvement of this utility model, both ends of the contact portion extend outward integrally to form the buffer portion.

[0009] As a further improvement of this utility model, the number of contact parts is set to two, the two contact parts are distributed at intervals, and each contact part is provided with a buffer part at both ends. Each contact part is fixedly connected to the two base parts through the buffer parts at both ends; the push rod passes through the gap between the two contact parts.

[0010] As a further improvement of this utility model, the elastic buffer is freely disposed between the magnetic pole piece and the push rod assembly, or the elastic buffer is fixedly connected to the magnetic pole piece through the base portion.

[0011] As a further improvement of this utility model, a dividing hole is provided in the middle of the buffer part along its own length direction, and the dividing hole divides the buffer part into at least two parts.

[0012] As a further improvement of this utility model, the number of elastic buffers is set to at least two, each of which is fixed to the magnetic pole piece and distributed around the push rod.

[0013] As a further improvement of this utility model, the buffer part is an arc-shaped sheet structure, a wave-shaped sheet structure, an S-shaped sheet structure, a sinusoidal sheet structure, or an inclined straight sheet structure.

[0014] As a further improvement of this utility model, the cross-sectional shape of the contact portion and the buffer portions at both ends of the whole is a trapezoidal or arched shape with a missing bottom.

[0015] As a further improvement of this utility model, the elastic buffer is at least partially made of metal material.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model provides a low-noise DC contactor. By setting an elastic buffer between the push rod assembly and the magnetic pole piece, when the push rod assembly switches from the extended state to the initial state, the part of the push rod assembly above the magnetic pole piece will directly impact the elastic buffer. The elastic buffer can buffer the impact of the push rod assembly through its own elastic deformation, which significantly reduces the noise generated by the collision between the push rod assembly and the magnetic pole piece. It can significantly improve the current situation of DC contactor noise greater than 65dB, improve the quietness of DC contactor operation in application scenarios such as new energy vehicles, and improve the user experience.

[0018] 2. The elastic buffer includes at least one contact portion, a buffer portion integrally extended from both ends of the contact portion, and two base portions. The contact portion is fixedly connected to the two base portions through the buffer portions at both ends, and there is a height difference between the contact portion and the base portions along the length of the push rod assembly. This design makes the functions of each part of the elastic buffer clear. The contact portion is used to abut against the push rod assembly, the buffer portion is specifically responsible for generating elastic deformation to provide buffering, and the base portions are stably supported on the top surface of the magnetic pole piece. The synergistic effect effectively improves the buffering effect. At the same time, the elastic buffer can form a stable structure to ensure that the elastic buffer can be evenly stressed when subjected to the impact of the push rod assembly, thereby improving the stability and reliability of the buffer.

[0019] 3. This utility model adopts an elastic buffer component integrally formed from a thin metal sheet. Utilizing the good elasticity, strength and durability of metal materials, the buffer part of the elastic buffer component has strong fatigue resistance, ensuring that the elastic buffer component can continuously and stably provide buffering effect during long-term use, guaranteeing the durability of noise reduction effect, reducing the risk of foreign objects, and extending the service life of DC contactors.

[0020] 4. The elastic buffer component in this utility model has a simple structure and flexible fixing method. It can be freely set between the magnetic pole piece and the push rod assembly for easy installation and replacement. Alternatively, the base part can be fixed to the magnetic pole piece by welding, riveting or using fasteners to meet different installation requirements and usage scenarios. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a partial perspective view of Embodiment 1 of the low-noise DC contactor of this utility model;

[0023] Figure 2 This is a partial exploded view of Embodiment 1 of the low-noise DC contactor of this utility model;

[0024] Figure 3 This is a perspective view of the elastic buffer element in Embodiment 1 of the low-noise DC contactor of this utility model;

[0025] Figure 4 This is a perspective view of the elastic buffer element in Embodiment 2 of the low-noise DC contactor of this utility model;

[0026] Figure 5 This is a perspective view of the elastic buffer element in Embodiment 3 of the low-noise DC contactor of this utility model;

[0027] Figure 6 This is a perspective view of the elastic buffer element in Embodiment 4 of the low-noise DC contactor of this utility model;

[0028] Figure 7 This is a perspective view of the elastic buffer element in Embodiment 5 of the low-noise DC contactor of this utility model;

[0029] Figure 8 This is a perspective view of the assembly of the elastic buffer and magnetic pole piece in Embodiment 5 of the low-noise DC contactor of this utility model.

[0030] Referring to the accompanying drawings, the following explanations are provided:

[0031] 1. Magnetic pole piece; 2. Elastic buffer; 201. Contact part; 202. Buffer part; 2021. Dividing hole; 203. Base part; 204. Gap; 3. Push rod; 4. Insulating base; 5. Bracket; 6. Contact spring; 7. Moving contact piece; 8. Stationary contact. Detailed Implementation

[0032] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0035] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0037] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0038] Example 1

[0039] See Figures 1 to 3This utility model provides a low-noise DC contactor, comprising: a magnetic pole piece 1 and a push rod assembly. The push rod assembly includes a push rod 3, which passes through the magnetic pole piece 1. A portion of the push rod assembly is positioned above the magnetic pole piece 1, and another portion extends downward through the magnetic pole piece 1. In this embodiment, the portion of the push rod assembly positioned above the magnetic pole piece 1 includes an insulating base 4 and a bracket 5. The portion of the push rod assembly extending downward through the magnetic pole piece 1 is the push rod 3. This structure will be described in detail below.

[0040] The push rod assembly has two states: an initial state where the portion of the push rod assembly above the magnetic pole piece 1 stops downwards at the magnetic pole piece 1, and an extended state where the push rod assembly moves into position in a direction away from the magnetic pole piece 1. In the initial state, the DC contactor is open; in the extended state, the DC contactor is closed.

[0041] It should be noted that "movement in position" refers to the position of the push rod assembly when it follows the movement of the moving iron core of the DC contactor until the moving iron core is attracted to the stationary iron core of the DC contactor.

[0042] As one of the important improvements of this utility model, an elastic buffer 2 is provided between the part of the push rod assembly above the magnetic pole piece 1 and the magnetic pole piece 1. When the push rod assembly switches from the pushed state to the initial state, the part of the push rod assembly above the magnetic pole piece 1 will directly impact the elastic buffer 2. The elastic buffer 2 can provide buffering for the impact of the push rod assembly through its own elastic deformation, which significantly reduces the noise generated by the collision between the push rod assembly and the magnetic pole piece 1. It can significantly improve the current situation where the noise of DC contactors is greater than 65dB, improve the quietness of DC contactors in application scenarios such as new energy vehicles, and improve the user experience.

[0043] Furthermore, the elastic buffer 2 includes at least one contact portion 201 and two base portions 203. The contact portion 201 is disposed between the two base portions 203 and is positioned relatively upward, so that there is a height difference between the contact portion 201 and the two base portions 203 along the length direction of the push rod 3. At the same time, the contact portion 201 is also distributed on the side of the push rod 3. Both ends of the contact portion 201 are provided with buffer portions 202, and the buffer portions 202 are fixedly connected to the corresponding base portions 203.

[0044] The contact portion 201 abuts against the push rod assembly, the buffer portion 202 generates elastic deformation to provide cushioning, and the base portion 203 supports the top surface of the magnetic pole piece 1. This structural design clearly defines the functions of each part of the elastic buffer 2: the contact portion 201 abuts against the push rod assembly, the buffer portion 202 is specifically responsible for generating elastic deformation to provide cushioning, and the base portion 203 stably supports the top surface of the magnetic pole piece 1. Their synergistic effect effectively improves the cushioning effect and reduces noise.

[0045] Of course, in other embodiments of this utility model, the contact portion 201 can also be disposed between the two base portions 203 and positioned relatively lower, so that there is a height difference between the contact portion 201 and the two base portions 203 along the length direction of the push rod 3. In this way, the two base portions 203 are used to abut against the push rod assembly, the buffer portion 202 is also used to generate elastic deformation to provide buffering, and the contact portion 201 is used to support the top surface of the magnetic pole piece 1. By adopting this structural design, the technical effect described above can also be achieved.

[0046] See Figure 1 and Figure 3 In this embodiment, both base portions 203 are sheet-like and located on the same plane, serving to jointly support the top surface of the magnetic pole piece 1. A contact portion 201 is positioned between the two base portions 203 and slightly above them. Both ends of the contact portion 201 extend outward integrally to form a buffer portion 202, and the contact portion 201 is fixedly connected to the two base portions 203 respectively through the buffer portions 202 at both ends. This design of the elastic buffer member 2 in this invention enables a stable structure, ensuring that the elastic buffer member 2 receives uniform force when subjected to the impact of the push rod assembly, thus improving the stability and reliability of the buffer.

[0047] In this invention, the elastic buffer 2 is at least partially made of metal. For example, both the contact portion 201 and the base portion 203 can be made of metal to provide rigid contact and support, while the buffer portion 202 can be made of a soft rubber or other soft material to cushion the impact on the push rod portion. Alternatively, both the contact portion 201 and the buffer portion 202 can be made of metal, and the base portion 203 can be made of plastic and integrally injection molded with the contact portion 201 and the buffer portion 202. Yet another option is that the contact portion 201, the buffer portion 202, and the base portion 203 can all be made of metal.

[0048] like Figure 3As shown, preferably, the elastic buffer 2 in this embodiment is integrally formed from an elastic metal sheet (e.g., by stamping). Since DC contactors are frequently switched on and off, requiring a mechanical lifespan of hundreds of thousands of cycles, this integrally formed elastic buffer 2 utilizes the excellent elasticity, strength, and durability of the metal material. This gives the buffer portion 202 of the elastic buffer 2 strong fatigue resistance, ensuring that the elastic buffer 2 can continuously and stably provide a buffering effect during long-term use, guaranteeing the durability of the noise reduction effect, reducing the risk of foreign objects, and extending the service life of the DC contactor.

[0049] In this embodiment, the number of contact portions 201 of the elastic buffer member 2 is set to two, and each contact portion 201 is provided with a buffer portion 202 at both ends. Each contact portion 201 is integrally connected to the two base portions 203 through the buffer portions 202 at both ends.

[0050] It is worth mentioning that the two contact portions 201 are spaced apart to form a gap 204 between them, through which the push rod 3 passes. This design facilitates the assembly of the elastic buffer 2 and the push rod assembly, allowing the elastic buffer 2 to be freely positioned between the magnetic pole piece 1 and the push rod assembly for easy installation and replacement; alternatively, the base portion 203 can be fixed to the magnetic pole piece 1 by welding, riveting, or using fasteners to meet different installation requirements and usage scenarios.

[0051] See Figure 3 In this embodiment, the buffer portion 202 has a wave-shaped sheet structure. The overall cross-sectional shape of the contact portion 201 and the buffer portions 202 at both ends is similar to a trapezoid with a missing base. When the push rod assembly switches from the pushed state to the initial state, the part of the push rod assembly above the magnetic pole piece 1 abuts against the contact portion 201. The buffer portion 202 provides flexible contact, which buffers the impact of the push rod assembly, reduces collision noise, and the wave-shaped sheet structure of the buffer portion 202 can distribute concentrated stress to multiple bending areas, avoid excessive local stress, and reduce the risk of fatigue fracture. At the same time, the use of a trapezoidal structure can further enhance the overall buffering capacity of the elastic buffer 2, making the buffering process smoother and effectively reducing the impact force.

[0052] Of course, in other embodiments of this utility model, the buffer part 202 can also be configured as an S-shaped sheet structure or a sinusoidal sheet structure with a more rounded bending position.

[0053] In this invention, the push rod assembly adopts existing conventional technology, which includes a push rod 3, an insulating base 4, and a bracket 5. The insulating base 4 is an injection-molded part, and the upper end of the push rod 3 and the lower end of the bracket 5 are integrally injection-molded into the insulating base 4 and insulated by the insulating base 4. The insulating base 4 and the bracket 5 are located above the magnetic pole piece 1.

[0054] In addition to the above, the low-noise DC contactor of this utility model also includes an electromagnetic mechanism, a moving contact 7, a ceramic cover, and two stationary contacts 8, all employing existing conventional technologies. The ceramic cover and electromagnetic mechanism are not shown in the figures. The electromagnetic mechanism includes a coil winding disposed below the magnetic pole piece 1, and a moving iron core and a stationary iron core disposed inside the coil winding. The stationary iron core is fixed to the bottom of the magnetic pole piece 1, and the moving iron core is arranged at a relative interval below the stationary iron core, with a reaction spring installed between the moving and stationary iron cores. The lower end of the push rod 3 passes sequentially through the elastic buffer 2, the magnetic pole piece 1, and the stationary iron core before being fixedly connected to the moving iron core.

[0055] A ceramic cover is sealed and welded onto the magnetic pole piece 1. The moving contact 7, the insulating base 4, and the bracket 5 are all located inside the ceramic cover. The moving contact 7 is transversely inserted into the bracket 5, and a contact spring 6 is provided between the moving contact 7 and the insulating base 4. Two stationary contacts 8 are fixed side by side on the ceramic cover, and the lower ends of the two stationary contacts 8 extend into the interior of the ceramic cover, and are vertically aligned with the two ends of the moving contact 7.

[0056] When the coil winding is energized, the magnetized moving iron core is attracted by the stationary iron core and moves upward, eventually attracting to the bottom of the stationary iron core. During this process, the moving iron core pushes the moving contact 7 upward through the push rod assembly, causing the moving contact 7 to contact and conduct with the two stationary contacts 8. At this time, the push rod assembly is in the extended state. When the coil winding is de-energized, the magnetic attraction between the moving iron core and the stationary iron core disappears. Under the combined action of the reaction spring and the contact spring 6, the moving iron core moves downward and, through the push rod assembly, causes the moving contact 7 to separate from the two stationary contacts 8. During this process, the insulating base 4 impacts the elastic buffer 2. The elastic buffer 2 can generate elastic deformation by relying on the buffer part 202 to buffer the impact of the push rod assembly, significantly reducing the noise generated by the collision between the push rod assembly and the magnetic pole piece 1.

[0057] Example 2

[0058] The difference between this embodiment and Embodiment 1 is that the structure of the elastic buffer 2 is different. Specifically, the structure of the buffer portion 202 in the elastic buffer 2 is different.

[0059] like Figure 4As shown, the buffer section 202 in this embodiment is an inclined linear sheet structure. The buffer sections 202 located at the left and right ends of the contact section 201 are distributed in a figure-eight shape. The overall cross-sectional shape of the contact section 201 and the buffer sections 202 at its left and right ends is a trapezoid with a missing bottom. This trapezoidal structure can convert the impact kinetic energy into the elastic potential energy of the buffer section, ensuring rapid reset after being impacted by the push rod assembly. Furthermore, it has strong impact resistance and fatigue resistance, and can adapt to the frequent switching of the DC contactor.

[0060] Example 3

[0061] The difference between this embodiment and Embodiment 1 is that the structure of the elastic buffer 2 is different. Specifically, the contact portion 201 and the buffer portion 202 in the elastic buffer 2 have different structures.

[0062] See Figure 5 In this embodiment, both the contact portion 201 and the buffer portion 202 are arc-shaped sheet structures. The overall cross-sectional shape of the contact portion 201 and the buffer portions 202 at its left and right ends is arched, such as parabolic. This arched or parabolic structure can convert impact kinetic energy into elastic potential energy of the buffer portion, ensuring rapid reset after being impacted by the push rod assembly. Furthermore, it has strong impact resistance and fatigue resistance, and can adapt to the frequent switching of DC contactors.

[0063] Of course, in other embodiments of this utility model, the cross-sectional shape of the whole formed by the contact part 201 and the buffer parts 202 at its left and right ends can also be dome-shaped or hemispherical, and the same technical effect can be achieved.

[0064] Example 4

[0065] The difference between this embodiment and any one of the embodiments one to three is that: this embodiment also provides a dividing hole 2021 in the middle of the buffer part 202 along its own length direction, and the dividing hole 2021 divides the buffer part 202 into at least two parts.

[0066] Figure 6 The diagram shows the addition of a dividing hole 2021 to the elastic buffer 2 in Embodiment 1. Similarly, a dividing hole 2021 can also be added to the elastic buffer 2 in Embodiment 2 or Embodiment 3.

[0067] In this embodiment, by opening a dividing hole 2021 in the middle of the buffer part 202 along its own length direction, the buffer part 202 is divided into at least two parts. This design increases the deformation freedom of the buffer part 202, so that it can generate elastic deformation more flexibly when it is impacted by the push rod assembly, further improving the buffering effect. At the same time, it can extend the noise propagation path and help to better reduce noise.

[0068] Example 5

[0069] The difference between this embodiment and any one of the embodiments one to four is that the elastic buffer 2 has a gapless design in the middle 204, the elastic buffer 2 includes only one contact part 201, two buffer parts 202 and two base parts 203, and the number of elastic buffers 2 is set to at least two.

[0070] See Figure 7 and Figure 8 In this embodiment, the number of elastic buffers 2 is specifically set to two. The two elastic buffers 2 are symmetrically arranged on both sides of the center hole of the magnetic pole piece 1 (that is, the left and right sides of the push rod 3). The base part 203 of the two elastic buffers 2 are fixed to the magnetic pole piece 1 by welding, riveting or using fasteners. This structure can also meet the noise reduction and buffering requirements.

[0071] Of course, in some other embodiments of this utility model, the number of elastic buffers 2 can also be set to four, with the four elastic buffers 2 fixed to the magnetic pole piece 1 and distributed around the push rod 3.

[0072] Therefore, it can be seen that the low-noise DC contactor of this utility model has an elastic buffer 2 between the push rod assembly and the magnetic pole piece 1. When the push rod assembly switches from the extended state to the initial state, the part of the push rod assembly above the magnetic pole piece 1 will directly impact the elastic buffer 2. The elastic buffer 2 can provide buffering for the impact of the push rod assembly through its own elastic deformation, which significantly reduces the noise generated by the collision between the push rod assembly and the magnetic pole piece 1. It can significantly improve the current situation where the noise of DC contactors is greater than 65dB, improve the quietness of DC contactors in application scenarios such as new energy vehicles, and improve the user experience. Furthermore, the elastic buffer 2 includes at least one contact portion 201, a buffer portion 202 integrally extended from both ends of the contact portion 201, and two base portions 203. The contact portion 201 is fixedly connected to the two base portions 203 through the buffer portions 202 at both ends, and there is a height difference between the contact portion 201 and the base portion 203 along the length direction of the push rod assembly. This design makes the functions of each part of the elastic buffer 2 clear. The contact portion 201 is used to abut against the push rod assembly, the buffer portion 202 is specifically responsible for generating elastic deformation to provide buffering, and the base portion 203 is stably supported on the top surface of the magnetic pole piece 1. The synergistic effect effectively improves the buffering effect. At the same time, the elastic buffer 2 can form a stable structure to ensure that the elastic buffer 2 can be evenly stressed when subjected to the impact of the push rod assembly, thereby improving the stability and reliability of the buffering. Meanwhile, this utility model employs an elastic buffer 2 integrally formed from a thin metal sheet. Utilizing the excellent elasticity, strength, and durability of the metal material, the buffer portion 202 of the elastic buffer 2 possesses strong fatigue resistance, ensuring that the elastic buffer 2 can continuously and stably provide buffering during long-term use, guaranteeing the durability of noise reduction effects, reducing the risk of foreign objects, and extending the service life of the DC contactor. Furthermore, the elastic buffer 2 in this utility model also has advantages such as simple structure and flexible fixing methods. It can be freely installed between the magnetic pole piece 1 and the push rod assembly for easy installation and replacement, or the base portion 203 can be fixed to the magnetic pole piece 1 by welding, riveting, or using fasteners to meet different installation requirements and usage scenarios.

[0073] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A low-noise DC contactor, comprising a magnetic pole piece (1) and a push rod assembly, the push rod assembly comprising a push rod (3) passing through the magnetic pole piece (1), the push rod assembly having two states: an initial state stopped on the magnetic pole piece (1) and a pushed-out state moving away from the magnetic pole piece (1) into position; characterized in that: An elastic buffer (2) is provided between the portion of the push rod assembly above the magnetic pole piece (1) and the magnetic pole piece (1). The elastic buffer (2) includes at least one contact portion (201) and two base portions (203). The contact portion (201) is located between the two base portions (203) and is positioned relatively higher or lower, so that there is a height difference between the contact portion (201) and the two base portions (203) along the length direction of the push rod (3). At the same time, the contact portion (201) is also distributed on the side of the push rod (3). Both ends of the contact portion (201) are provided with buffer portions (202), and the buffer portions (202) are fixedly connected to the corresponding base portions (203). When the push rod assembly switches from the pushed state to the initial state, the elastic buffer (2) can provide buffering against the impact of the push rod assembly through its own elastic deformation.

2. The low-noise DC contactor according to claim 1, characterized in that: The contact portion (201) is used to abut against the push rod assembly, the buffer portion (202) is used to generate elastic deformation to provide buffering, and the base portion (203) is used to support the top surface of the magnetic pole piece (1); Alternatively, the base portion (203) is used to abut against the push rod assembly, the buffer portion (202) is used to generate elastic deformation to provide buffering, and the contact portion (201) is used to support the top surface of the magnetic pole piece (1).

3. The low-noise DC contactor according to claim 1, characterized in that: Both ends of the contact portion (201) extend outward integrally to form the buffer portion (202).

4. The low-noise DC contactor according to claim 1, characterized in that: The number of the contact parts (201) is set to two, and the two contact parts (201) are distributed at intervals. Each contact part (201) has a buffer part (202) at both ends. Each contact part (201) is fixedly connected to the two base parts (203) through the buffer parts (202) at both ends respectively. The push rod (3) passes through the gap (204) between the two contact parts (201).

5. The low-noise DC contactor according to claim 4, characterized in that: The elastic buffer (2) is freely disposed between the magnetic pole piece (1) and the push rod assembly, or the elastic buffer (2) is fixedly connected to the magnetic pole piece (1) through the base part (203).

6. The low-noise DC contactor according to claim 1, characterized in that: The buffer section (202) has a dividing hole (2021) in the middle along its own length direction, and the dividing hole (2021) divides the buffer section (202) into at least two parts.

7. The low-noise DC contactor according to claim 1, characterized in that: The number of elastic buffers (2) is set to at least two, each of the elastic buffers (2) is fixed to the magnetic pole piece (1) and distributed around the push rod (3).

8. The low-noise DC contactor according to claim 1, characterized in that: The buffer section (202) is an arc-shaped sheet structure, a wave-shaped sheet structure, an S-shaped sheet structure, a sinusoidal sheet structure, or an inclined straight sheet structure.

9. The low-noise DC contactor according to claim 1, characterized in that: The cross-sectional shape of the contact part (201) and the buffer parts (202) at both ends together is a trapezoidal or arched shape with a missing bottom.

10. The low-noise DC contactor according to claim 1, characterized in that: The elastic buffer (2) is at least partially made of metal.

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