Push rod assembly, preparation method thereof and relay

Abstract

The invention relates to the technical field of electronic control devices, in particular to a push rod assembly, a preparation method thereof and a relay. The push rod assembly comprises a push rod, an auxiliary movable spring and an isolation cover, the auxiliary movable spring comprises an auxiliary movable reed and an auxiliary movable contact, and the auxiliary movable contact is arranged at the end of the auxiliary movable reed; the isolation cover is connected with the push rod and the auxiliary movable reed, so that the isolation cover and the auxiliary movable reed follow the push rod; the isolation cover covers the auxiliary moving contact and is used for isolating the auxiliary moving contact from the driving spring; and the isolation cover is used for prolonging the creepage distance from the main movable spring to the auxiliary movable spring. The push rod assembly can isolate the driving spring from the auxiliary movable contact, prevents the auxiliary movable contact from being polluted by an electric arc generated when the main contact is separated, and also can increase the creepage distance between the driving spring and the auxiliary movable spring through the isolation cover, so as to improve the safety level and the structural performance of the relay.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic control devices, and in particular to a push rod assembly and a preparation method thereof, and a relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. A relay is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] Auxiliary contacts are usually set in existing relays. The open / closed state between the moving contact and the static contact is monitored by the contact or separation of the auxiliary moving contact and the auxiliary static contact in the auxiliary contact. However, there are several factors in the relay that affect the working state of the auxiliary moving contact. First, the arc generated when the main contact is separated may contaminate the auxiliary moving contact and affect the normal operation of the auxiliary moving contact. Second, when the creepage distance between the auxiliary moving contact and the active spring is too short, it will affect the working performance of the auxiliary moving contact. It is worth noting that when the auxiliary moving contact cannot work normally, it will affect the monitoring state of the auxiliary moving contact on the main contact, which will in turn affect the safety performance and structural performance of the relay. Summary of the invention

[0004] The present invention provides a push rod assembly and a preparation method thereof, and a relay. The push rod assembly can isolate an active spring and an auxiliary moving contact to prevent the arc generated when the main contact is separated from contaminating the auxiliary moving contact, and can also use an isolation cover to increase the creepage distance between the active spring and the auxiliary moving spring to improve the safety level and structural performance of the relay.

[0005] The present invention provides a push rod assembly, comprising: a push rod, an auxiliary dynamic spring and an isolation cover, wherein the auxiliary dynamic spring comprises an auxiliary dynamic spring sheet and an auxiliary dynamic contact, and the auxiliary dynamic contact is provided at the end of the auxiliary dynamic spring sheet; the isolation cover connects the push rod and the auxiliary dynamic spring sheet so that the isolation cover and the auxiliary dynamic spring follow the push rod; the isolation cover covers the auxiliary dynamic contact to isolate the auxiliary dynamic contact from the active spring; and the isolation cover is used to extend the creepage distance from the active spring to the auxiliary dynamic spring.

[0006] According to some embodiments of the invention, part of the auxiliary moving reed is wrapped inside the isolation cover, and the rest of the auxiliary moving reed extends out of the isolation cover; and the isolation cover covers the rest of the auxiliary moving reed extending out of the isolation cover and the auxiliary moving contact.

[0007] According to some embodiments of the invention, the isolation cover comprises a main body and a cover shell, wherein:

[0008] The main body is connected to the push rod and the auxiliary moving spring;

[0009] The cover shell is connected to the main body, and the cover shell covers the remaining part of the auxiliary moving spring extending from the main body and the auxiliary moving contact.

[0010] According to some embodiments of the invention, the auxiliary moving contacts are provided at both ends of the auxiliary moving reed along the length direction of the auxiliary moving reed; the number of the cover shells is two, and the two cover shells are placed on opposite sides of the main body along the length direction of the auxiliary moving reed, and each of the cover shells covers the auxiliary moving contact at the same end of the auxiliary moving reed.

[0011] According to some embodiments of the invention, a first through hole is opened in the middle area of ​​the auxiliary movable spring along the length direction of the auxiliary movable spring, the main body is covered in the middle area, one axial end of the push rod is passed through the first through hole, and one axial end of the push rod is integrally formed in the main body.

[0012] According to some embodiments of the present invention, the cover shell is provided with an opening in a direction perpendicular to the axial direction of the push rod.

[0013] According to some embodiments of the present invention, along the arrangement direction of the two cover shells, each of the cover shells is provided with an opening on a side facing away from the other cover shell.

[0014] According to some embodiments of the invention, the housing comprises:

[0015] Two first plates, the two first plates are arranged opposite to each other, and the arrangement direction of the two first plates is perpendicular to the axial direction of the push rod and perpendicular to the length direction of the auxiliary movable spring;

[0016] A second plate body, along the length direction of the auxiliary movable spring, the second plate body connecting two ends of the first plate bodies toward the main body;

[0017] A top plate, the top plate connects the two first plate bodies and the second plate body to form a cavity for accommodating the auxiliary moving contact; and the top plate and the two first plate bodies form the opening on a side facing away from the main body.

[0018] According to some embodiments of the present invention, the openings on the two cover shells are arranged along a diagonal line of the isolation cover, and the main body cooperates with each of the cover shells to form the openings.

[0019] According to some embodiments of the invention, the housing comprises: a first plate body and a second plate body, wherein:

[0020] The first plate is connected to the main body, and an extending direction of the first plate is perpendicular to the axis of the push rod;

[0021] The second plate body extends from the first plate body, and an extending direction of the second plate body is perpendicular to an extending direction of the first plate body. The second plate body is provided with the opening.

[0022] According to some embodiments of the invention, the push rod assembly further includes: a contact bracket, the contact bracket is connected to the isolation cover, and the contact bracket moves with the push rod.

[0023] According to some embodiments of the present invention, the contact support is connected to the push rod, the auxiliary dynamic spring and the isolation cover by integral injection molding.

[0024] According to some embodiments of the invention, the contact bracket includes a bottom plate, a top plate and two side plates arranged opposite to each other, and along the axial direction of the push rod, the two side plates are located on the same side of the bottom plate, and the top plate is connected to the other end of the two side plates facing away from the bottom plate.

[0025] According to some embodiments of the invention, the isolation cover also includes two extension structures, which extend from opposite sides of the main body along the arrangement direction of the two side panels; each of the extension structures extends in a direction away from the push rod, and each of the extension structures wraps around one end of the side panel close to the main body.

[0026] According to some embodiments of the invention, a connecting structure is provided between the cover shell and the adjacent extension structure, and the connecting structure connects the cover shell and the main body and / or extension structure to block the gap between the cover shell and the main body and / or extension structure.

[0027] According to some embodiments of the present invention, an elastic member is installed on the side of the isolation cover facing away from the push rod along the axial direction of the push rod.

[0028] According to some embodiments of the invention, along the axial direction of the push rod, an isolation retaining wall is provided on the side of the main body facing away from the push rod, and the isolation retaining wall extends from the surface of the main body toward the direction away from the push rod; and along the radial direction of the push rod, the isolation retaining wall is provided on at least one side of the elastic member.

[0029] According to some embodiments of the invention, the isolation cover is connected to the push rod and the auxiliary dynamic spring by integral injection molding.

[0030] The present invention also provides a relay, comprising a push rod assembly provided by any of the above technical solutions.

[0031] According to some embodiments of the invention, it also includes a yoke plate and an auxiliary lead-out piece, the auxiliary lead-out piece and the push rod in the push rod assembly penetrate the yoke plate, and the auxiliary lead-out piece is provided with an auxiliary static contact corresponding to the auxiliary moving contact on the side of the yoke plate facing the auxiliary moving spring.

[0032] The present invention also provides a method for preparing a push rod assembly, comprising: using an injection molding process to connect a push rod and an auxiliary dynamic spring and form an isolation cover, wherein the isolation cover covers an auxiliary dynamic contact of the auxiliary dynamic spring.

[0033] The present invention also provides a method for preparing a push rod assembly, comprising:

[0034] Using an injection molding process, a first structural member is formed at a preset position of the push rod and the auxiliary dynamic spring, and the push rod and the auxiliary dynamic spring are connected through the first structural member;

[0035] The injection molding process is used again to prepare a second structural member on the surface of the first structural member to form an isolation cover; wherein the isolation cover covers the auxiliary moving contact of the auxiliary moving spring to isolate the auxiliary moving contact from the active spring; and the isolation cover is used to extend the creepage distance from the active spring to the auxiliary moving spring.

[0036] According to some embodiments of the present invention, a method for preparing a first structural member at a preset position of a push rod and an auxiliary dynamic spring by using an injection molding process further includes:

[0037] Providing a contact support;

[0038] The first structural member is formed at one axial end of the push rod, the auxiliary dynamic spring and a preset position of the contact bracket by using an injection molding process.

[0039] An embodiment of the above invention has at least the following advantages or beneficial effects:

[0040] In the push rod assembly provided by the present invention, an isolation cover is provided to cover the auxiliary moving contact to separate the auxiliary moving contact from the active spring, so that the moving contact on the active spring and the auxiliary moving contact in the auxiliary moving spring are separated on both sides of the isolation cover along the axial direction of the push rod. Accordingly, when the moving contact is separated from the static contact to generate an arc, the isolation cover can form an isolation protection for the auxiliary moving contact to prevent the arc from contaminating the auxiliary moving contact. At the same time, in the push rod assembly provided by the present invention, the isolation cover can increase the creepage distance between the auxiliary moving spring sheet and the active spring, so that it can be used in an environment with a higher voltage, so as to expand the application scenarios of the push rod assembly, and improve the insulation level and structural performance of the relay using the push rod assembly.

[0041] In addition, in the push rod assembly provided by the present invention, the isolation cover connects the auxiliary dynamic spring and the push rod, so that the isolation cover and the auxiliary dynamic spring follow the push rod, the overall dimension chain is small, the control accuracy is high, and the consistency of the movement trajectory of the moving contact and the auxiliary moving contact is ensured. Moreover, the isolation cover follows the auxiliary dynamic spring piece, and there is no need to reserve the auxiliary dynamic spring activity space, the structure is compact, and in addition, the number of parts is simplified, the cost is reduced, the assembly process is reduced, and the risk of non-conduction caused by scraping is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Shown is a top view of a relay provided by an embodiment of the present invention;

[0043] Figure 2 It shows Figure 1 Sectional view at AA in the middle;

[0044] Figure 3 It shows Figure 2 A schematic diagram of the three-dimensional structure of the middle push rod assembly after being assembled with the active spring;

[0045] Figure 4 It shows Figure 3 A schematic plan view of the structure;

[0046] Figure 5 It shows Figure 4 Sectional view at the middle BB;

[0047] Figure 6 It shows Figure 3 A schematic plan view of the structure at another angle;

[0048] Figure 7 It shows Figure 6 Sectional view at CC;

[0049] Figure 8 It shows Figure 2 A schematic diagram of the three-dimensional structure of the middle push rod assembly;

[0050] Fig. 9 It shows Figure 8 A schematic diagram of the three-dimensional structure of the middle push rod assembly at another angle;

[0051] Fig.10 It shows Figure 8 Schematic diagram of current creep on the surface of the middle push rod assembly;

[0052] Fig.11 It shows Fig.10 Schematic diagram of the structural division of the middle push rod assembly;

[0053] Fig.12 It shows Fig.11 An exploded schematic diagram of a portion of the structure of the middle push rod assembly;

[0054] Fig.13 It shows Fig.11 A schematic diagram of the structure of the remaining structure of the middle push rod assembly;

[0055] Fig.14 It shows Fig.13 A schematic diagram of the structure at another angle;

[0056] Fig.15 A schematic diagram of a second stereoscopic structure of the push rod assembly provided by an embodiment of the present invention after being assembled with an active spring is shown;

[0057] Fig.16 The figure shows a second stereoscopic structural diagram of a push rod assembly provided by an embodiment of the present invention;

[0058] Fig.17 It shows Fig.16 A schematic diagram of the three-dimensional structure of the middle push rod assembly;

[0059] Fig.18 It shows Fig.11 A schematic diagram of the structure of the remaining structure of the middle push rod assembly;

[0060] Fig.19 It shows Fig.18 A schematic diagram of the structure at another angle;

[0061] Fig. 20 It shows Figure 2 A magnified cross-sectional view of the auxiliary lead-out part;

[0062] Fig.21 It shows Fig. 20 Structural diagram of the auxiliary lead-out parts;

[0063] Fig. 22 It shows Fig.21 The second structural diagram of the auxiliary lead-out part;

[0064] Fig.23 Shown is a flow chart of a method for preparing a push rod assembly provided by an embodiment of the present invention.

[0065] The following are the descriptions of the reference numerals:

[0066] 10. Relay; 100. Yoke iron plate; 200. Insulation cover; 300. Main contact part; 310. Active spring; 311. Moving contact; 320. Stationary contact; 321. Lead-out terminal; 322. Stationary contact; 400. Push rod assembly; 410. Push rod; 420. Auxiliary moving spring; 421. Auxiliary moving spring piece; 4211. First through hole; 422. Auxiliary moving contact; 430. Isolation cover; 431. Main body; 431a. First structural member; 431b. Second structural member; 431 1. Isolation retaining wall; 4312. Extension structure; 4313. Limiting structure; 432. Cover shell; 4321. Opening; 4322. First plate body; 4323. Second plate body; 4324. Top plate; 4325. Auxiliary port; 433. Connection structure; 440. Elastic member; 450. Contact bracket; 451. Side plate; 452. Bottom plate; 453. Top plate; 500. Magnetic circuit assembly; 600. Auxiliary lead-out member; 700. Connection assembly; 710. Ceramic member; 720. Transition piece. DETAILED DESCRIPTION

[0067] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0068] like Figure 1 to Figure 2 An embodiment of the present invention provides a relay 10 , which includes a yoke plate 100 , an insulating cover 200 , a main contact portion 300 , a push rod assembly 400 and a magnetic circuit assembly 500 .

[0069] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products or devices.

[0070] The yoke plate 100 is provided with a through hole structure, and the through hole structure penetrates two side surfaces in the thickness direction of the yoke plate 100. The insulating cover 200 is provided on one side surface of the yoke plate 100, and covers the through hole structure of the yoke plate 100.

[0071] The main contact part 300 includes an active spring 310 and two stationary contacts 320. The stationary contact 320 is fixed relative to the insulating cover 200, and one end of the stationary contact 320 penetrates to the outside of the insulating cover 200 to form a lead-out end 321, and the other end of the stationary contact 320 located in the insulating cover 200 forms a stationary contact 322. It should be understood that the stationary contact 322 and the stationary contact 320 can be a separate structure or an integrated structure, that is, the stationary contact 322 can be installed separately on the surface of the stationary contact 320, or the stationary contact 322 can be formed by part of the stationary contact 320. The active spring 310 is movably arranged in the insulating cover 200, and the active spring 310 includes an active spring leaf, and the two ends of the active spring leaf in the length direction are provided with moving contacts 311. Similarly, the movable contact 311 and the active spring can be separated or integrated, that is, the movable contact 311 can be installed on the surface of the active spring alone, or the movable contact 311 can be formed by part of the active spring. Each movable contact 311 corresponds to a static contact 322, and the movable contact 311 moves with the active spring 310 to contact or disengage with the corresponding static contact 322, so as to close or disconnect the main contact of the main contact part 300.

[0072] It should be understood that the movable contact 311 and the stationary contact 322 in the main contact portion 300 form a main contact.

[0073] The push rod assembly 400 penetrates the yoke iron plate 100. Specifically, the push rod assembly 400 is movably arranged in the through hole structure of the yoke iron plate 100. The active spring 310 of the main contact part 300 follows the push rod assembly 400. When the push rod assembly 400 moves back and forth, it can drive the active spring 310 to move, thereby realizing the closing or disconnection of the main contact of the main contact part 300.

[0074] The magnetic circuit assembly 500 is used to drive the reciprocating motion of the push rod assembly 400, so that the active spring 310 follows the push rod assembly 400, thereby realizing the closing or opening of the main contact of the main contact part 300. Figure 2 The middle magnetic circuit component 500 is roughly circled by a dotted frame, and the specific position may be biased.

[0075] The push rod assembly 400 in the relay 10 provided in the embodiment of the present invention can be a push rod assembly 400 in any of the following technical solutions. Of course, the push rod assembly 400 can also be configured in other ways according to the requirements, which will not be described in detail here.

[0076] Please combine Figure 1 and Figure 2 refer to Figures 3 to 19 The structure shown in the figure, the embodiment of the present invention provides a push rod assembly 400. Figures 3 to 9As shown, the push rod assembly 400 includes: a push rod 410, an auxiliary dynamic spring 420 and an isolation cover 430, the auxiliary dynamic spring 420 includes an auxiliary dynamic spring sheet 421 and an auxiliary dynamic contact 422, and the end of the auxiliary dynamic spring sheet 421 is provided with an auxiliary dynamic contact 422; the isolation cover 430 connects the push rod 410 and the auxiliary dynamic spring sheet 421, so that the isolation cover 430 and the auxiliary dynamic spring 420 follow the push rod 410; the isolation cover 430 covers the auxiliary dynamic contact 422 to isolate the auxiliary dynamic contact 422 from the active spring 310; and the isolation cover 430 is used to extend the creepage distance from the active spring 310 to the auxiliary dynamic spring 420.

[0077] It should be noted that, in the push rod assembly 400 provided in the embodiment of the present invention, the isolation cover 430 covers the auxiliary moving contact 422 to separate the auxiliary moving contact 422 from the active spring 310, so that the moving contact 311 on the active spring 310 and the auxiliary moving contact 422 in the auxiliary moving spring 420 are separated on both sides of the isolation cover 430 along the axial direction of the push rod 410. Accordingly, when the moving contact 311 and the static contact 322 separate to generate an arc, the isolation cover 430 can form an isolation protection for the auxiliary moving contact 422 to prevent the arc from contaminating the auxiliary moving contact 422.

[0078] At the same time, in the push rod assembly 400 provided in the embodiment of the present invention, the isolation cover 430 can increase the creepage distance between the auxiliary moving spring piece 421 and the active spring 310, so that it can be used in an environment with a higher voltage, so as to expand the application scenarios of the push rod assembly 400, and improve the insulation level and structural performance of the relay 10 using the push rod assembly 400.

[0079] In addition, in the push rod assembly 400 provided by the embodiment of the present invention, the isolation cover 430 connects the auxiliary dynamic spring 420 and the push rod 410, so that the isolation cover 430 and the auxiliary dynamic spring 420 follow the push rod 410, the overall dimension chain is small, the control accuracy is high, and the consistency of the movement trajectory of the moving contact 311 and the auxiliary moving contact 422 is ensured. Moreover, the isolation cover 430 follows the auxiliary dynamic spring piece 421, and there is no need to reserve the activity space of the auxiliary dynamic spring 420, and the structure is compact. In addition, the number of parts is simplified, the cost is reduced, the assembly process is reduced, and the risk of non-conduction caused by scraping is avoided.

[0080] In one embodiment, Figures 6 to 9 As shown, part of the auxiliary moving spring 421 is wrapped inside the isolation cover 430, and the remaining auxiliary moving spring 421 extends from the isolation cover 430; and the isolation cover 430 covers the remaining part of the auxiliary moving spring 421 extending from the isolation cover 430 and the auxiliary moving contact 422. In other words, along the axial direction of the push rod 410, the isolation cover 430 is a closed structure on the side of the auxiliary moving spring 421 facing away from the push rod, and there is no hole structure on the surface of the isolation cover 430 to provide a creepage path.

[0081] It should be noted that in the push rod assembly 400 provided in the embodiment of the present invention, the isolation cover 430 can better extend the creepage distance between the auxiliary moving spring 421 and the active spring 310, so as to improve the insulation level and structural performance of the relay 10 using the push rod assembly 400. Furthermore, the push rod assembly 400 can be used in an environment with a higher voltage to expand the application scenario.

[0082] In a specific embodiment, Figure 8 and Fig. 9 As shown, the isolation cover 430 includes a main body 431 and a cover shell 432, wherein: the main body 431 is connected to the push rod 410 and the auxiliary moving spring 421; the cover shell 432 is connected to the main body 431, and the cover shell 432 covers the remaining part of the auxiliary moving spring 421 extending from the main body 431 and the auxiliary moving contact 422.

[0083] It should be noted that, in this embodiment, the cover 432 separates the auxiliary moving contact 422 from the moving contact 311. When the moving contact 311 and the static contact 322 separate and generate an arc, the cover 432 can form an isolation protection for the auxiliary moving contact 422 to prevent the arc from contaminating the auxiliary moving contact 422. At the same time, the cover 432 can extend the creepage distance from the active spring 310 to the auxiliary moving spring 420.

[0084] In one embodiment, Figures 3 to 7 As shown, along the axial direction of the push rod 410, an elastic member 440 is installed on the side of the isolation cover 430 facing away from the push rod 410. The elastic member 440 abuts against the active spring 310, so the elastic member 440 is charged by the active spring 310. Accordingly, in this embodiment, the creepage distance from the active spring 310 to the auxiliary moving spring leaf 421 can be understood as: the creepage distance from the elastic member 440 to the auxiliary moving spring leaf 421. It should be understood that the elastic member 440 in the embodiment of the present invention can be a contact spring or a leaf spring. For example, the elastic member 440 is shown as a contact spring in each figure.

[0085] It can be understood that the lead end 321 of the static contact 320 is used to connect to the load, so the current flowing after the active spring 310 contacts the two static contacts 322 is strong. Since the elastic member 440 is in contact with the active spring 310, the current flowing through the elastic member 440 is also strong. Figure 2 The isolating cover 430 can also separate the elastic member 440 and the auxiliary moving contact 422 to isolate strong and weak electricity.

[0086] like Figures 3 to 7As shown, along the axial direction of the push rod 410, the elastic member 440 and the auxiliary dynamic spring 420 are isolated on both sides of the isolation cover 430. The creepage path from the elastic member 440 to the auxiliary dynamic spring 420 includes: the main body 431 to the edge of the cover 432 away from the main body 431, and after crossing over the edge of the cover 432, from the edge of the cover 432 to the auxiliary dynamic spring 420. In this embodiment, there is no hole structure on the surface of the isolation cover 430 to provide a creepage path.

[0087] Accordingly, the isolation cover 430 in the embodiment of the present invention can extend the creepage distance from the elastic member 440 to the auxiliary dynamic spring 420 to improve the insulation level of the relay 10, as well as improve the structural performance and safety performance of the relay 10.

[0088] In addition, in the push rod assembly 400 provided in this embodiment, the isolation cover 430 and the auxiliary dynamic spring 420 follow the push rod 410, so that the isolation cover 430 does not need to reserve a movable space for the auxiliary dynamic spring 420, making the structure of the relay 10 more compact and smaller in size.

[0089] As an example, the isolation cover 430 is connected to the push rod 410 and the auxiliary spring 420 by integral injection molding. In other words, the isolation cover 430, the push rod 410, and the auxiliary spring 420 are formed into a whole by injection molding. When the push rod 410 moves, the isolation cover 430 and the auxiliary spring 420 can move together with the push rod 410.

[0090] It should be noted that in the push rod assembly 400 provided in the embodiment of the present invention, the isolation cover 430, the auxiliary dynamic spring 420 and the push rod 410 are designed as an integrated whole, with fewer dimensional chains and high control accuracy, thereby ensuring the consistency of the movement trajectories of the moving contact 311 and the auxiliary moving contact 422.

[0091] Of course, in other embodiments, the isolation cover 430 and the auxiliary dynamic spring 420 as well as the isolation cover 430 and the push rod 410 may be connected by means of gluing, clamping, etc., which will not be described in detail.

[0092] It is understandable that the isolation cover 430 can be made of high temperature resistant insulating plastic, such as PA6T, PA10T, etc.

[0093] like Fig. 9 As shown, along the length direction of the auxiliary moving spring piece 421, both ends of the auxiliary moving spring piece 421 are provided with auxiliary moving contacts 422. There are two cover shells 432, which are placed on opposite sides of the main body 431 along the length direction of the auxiliary moving spring piece 421, and each cover shell 432 covers the auxiliary moving contact 422 at the same end of the auxiliary moving spring piece 421.

[0094] It should be noted that, in the present embodiment, each cover shell 432 effectively isolates and protects the corresponding auxiliary moving contact 422 to prevent arc contamination of the auxiliary moving contact 422 , thereby extending the service life of the auxiliary moving contact 422 , thereby improving the accuracy of its detection and improving the structural performance of the relay 10 .

[0095] It is worth noting that in order to facilitate the integral injection molding of the auxiliary movable spring 421 and the push rod 410, a first through hole 4211 ( Fig.12 ), the main body 431 covers the middle area, and one axial end of the push rod 410 is inserted into the first through hole 4211. Accordingly, when the isolation cover 430 is formed by injection molding, one axial end of the push rod 410 can be integrally formed in the main body 431 to simplify the number of structural parts and reduce the difficulty of preparation.

[0096] Please continue to refer to Fig. 9 In the structure shown, the cover 432 is open on the side facing away from the active spring 310 to facilitate assembly and injection molding operations.

[0097] In one embodiment, Figure 8 and Fig. 9 As shown, the cover 432 is provided with an opening 4321 in a direction perpendicular to the axial direction of the push rod 410. It should be understood that the auxiliary static contact (described in the subsequent structure) and the auxiliary moving contact 422 in the relay 10 provided by the embodiment of the present invention can be in a normally open state, and the opening 4321 does not affect the structural performance of the relay 10.

[0098] It should be noted that the structural design of the opening 4321 can reduce weight, improve assembly visualization, and further facilitate the demolding operation after injection molding, thereby reducing the difficulty of preparing the push rod assembly 400.

[0099] It is worth noting that the number of openings 4321 on each cover shell 432 can be one, two, three, etc., and can be set according to specific needs.

[0100] When the isolation cover 430 is provided, there are many possible structures of the isolation cover 430. Now, the structure of the isolation cover 430 is exemplified in accordance with the location of the opening 4321.

[0101] In one embodiment, Figure 8 and Fig. 9 As shown, along the arrangement direction of the two housings 432, each housing 432 is provided with an opening 4321 on the side facing away from the other housing 432. It should be noted that this arrangement can facilitate the demoulding operation to reduce the difficulty of preparation and assembly.

[0102] In addition, it is worth noting that the structural design of the two openings 4321 on the opposite sides of the cover 432 in this embodiment has an anti-mistake function, and there is no need to worry about whether the cover 432 on both sides of the isolation cover 430 is reversed.

[0103] In this embodiment, if Figure 8 and Fig. 9 As shown, the housing 432 includes: two first plates 4322, a second plate 4323 and a top plate 4324. The two first plates 4322 are arranged opposite to each other, and the arrangement direction of the two first plates 4322 is perpendicular to the axial direction of the push rod 410, and perpendicular to the length direction of the auxiliary moving spring 421. In other words, the arrangement direction of the two first plates 4322 is parallel to the width direction of the auxiliary moving spring 421. In addition, the two first side plates 451 can be arranged perpendicular to the yoke iron plate 100. The second plate 4323 connects one end of the two first plates 4322 facing the main body 431, and the second plate 4323 connects the main body 431. The top plate 4324 connects the two first plates 4322 and the second plate 4323 to form a chamber for accommodating the auxiliary moving contact 422; and the top plate 4324 and the two first plates 4322 form an opening 4321 on the side facing away from the main body 431.

[0104] It should be noted that, in this embodiment, the two first plates 4322, the second plate 4323 and the top plate 4324 are equivalent to surrounding the auxiliary moving contact 422 from four directions, which can optimize the isolation protection of the auxiliary moving contact 422 formed by the cover 432, and avoid the arc generated when the main contacts are separated from contaminating the auxiliary moving contact 422.

[0105] At the same time, in this embodiment, the second plate 4323 or other plate is connected to the main body 431 so that the remaining part of the auxiliary movable spring 421 passing through the main body 431 is covered by the isolation cover 430, and the surface of the isolation cover 430 has no hole structure to provide a creepage path to extend the creepage path or even the creepage distance from the elastic member 440 to the auxiliary movable spring 421.

[0106] In order to clearly understand the creepage path from the elastic member 440 to the auxiliary spring 421 in this embodiment, please refer to Fig.10 The structure shown. Fig.10 For example, the axial direction of the push rod assembly 400 is direction Z, the length direction of the auxiliary movable spring 421 is direction X, and the width direction of the auxiliary movable spring 421 is direction Y, wherein direction X, direction Y, and direction Z are perpendicular to each other.

[0107] When the current creeps from the elastic member 440 to the auxiliary moving spring 421, the current creeps along the surface of the isolation cover 430, and there may be a path a and a path b. When the size of the first plate 4322 in the direction X is larger than the size of the top plate 4324 in the direction X, the current creeps along the path a on the surface of the top plate 4324; conversely, when the size of the first plate 4322 in the direction X is smaller than the size of the top plate 4324 in the direction X, the current creeps along the path b on the surface of the first plate 4322.

[0108] For example, Fig.10 As shown, during the current creeping along the path a, the current moves along the second plate 4323 close to the elastic member 440 ( Figure 3 The current crawls along the outer surface of the top plate 4324 to the top surface of the top plate 4324; then, it crawls along the direction X on the top surface of the top plate 4324 until it reaches the edge of one side of the top plate 4324 facing away from the main body 431, and the current turns over to the bottom surface of the top plate 4324; then, the current moves in the opposite direction in the direction X along the bottom surface of the top plate 4324 until it reaches the auxiliary moving spring piece 421.

[0109] For example, Fig.10 As shown, during the current creeping along the path b, the current creeps along the outer surface of the second plate 4323 close to the elastic member 440 to the outer surface of the first plate 4322; then, as shown in Figure 1 As shown, the current creeps along the direction X on the outer surface of the first plate 4322 until it reaches the edge of one side of the first plate 4322 facing away from the main body 431, and the current turns over to the inner surface of the first plate 4322; thereafter, the current moves in the opposite direction along the inner surface of the first plate 4322 in the direction X until it reaches the auxiliary movable spring 421.

[0110] like Figures 3 to 10 As shown, the push rod assembly 400 further includes: a contact bracket 450, which is connected to the isolation cover 430, and the contact bracket 450 follows the push rod 410. The contact bracket 450 can be connected to the push rod 410, the auxiliary dynamic spring 420 and the isolation cover 430 by integral injection molding, so as to further improve the integration of the push rod assembly 400, thereby optimizing the following effect of each structural component and reducing the difficulty of assembly.

[0111] like Figures 3 to 9 as well as Fig.12 As shown, in a specific embodiment, the contact bracket 450 includes: a bottom plate 452, a top plate 453 and two side plates 451 arranged opposite to each other. Along the axial direction of the push rod 410, the two side plates 451 are located on the same side of the bottom plate 452, and the top plate 453 is connected to the other end of the two side plates 451 facing away from the bottom plate 452.

[0112] It should be understood that there are many possible structural forms of the contact support 450. As an example, Fig.11 As shown, in this embodiment, the bottom plate 452 and the two side plates 451 are an integrated structure, and the two side plates 451 cooperate with the bottom plate 452 to form a U-shaped structure, and the bottom plate 452 is wrapped inside the main body 431. It should be understood that the bottom plate 452 is provided with a through hole structure to facilitate the push rod 410 to pass through it.

[0113] Please combine Fig.13 For reference Figures 3 to 7 After the relevant structural parts are assembled in the U-shaped structure formed by the bottom plate 452 and the side plate 451, the top plate 453 is installed on the side of the two side plates 451 facing away from the bottom plate 452. It is worth noting that after the top plate 453 is connected to the U-shaped structure, the elastic member 440 can be elastically tensioned between the bottom surface of the active spring 310 and the main body 431, and the active spring 310 is pushed toward the inner side of the top plate 453.

[0114] When assembling the isolation cover 430 in the push rod assembly 400 provided in the embodiment of the present application, Fig.10 and Fig.11 As shown, the main body 431 is divided into a first structural member 431a and a second structural member 431b, wherein the first structural member 431a is formed in the first injection molding operation, and the second structural member 431b is formed in the second injection molding operation. Fig.13 and Fig.14 shown.

[0115] It is worth noting that after the first injection molding process, the push rod 410, the auxiliary spring 420 and the first structural member 431a form an integral structure. Afterwards, the second structural member 431b is prepared on the surface of the integral structure. The second structural member 431b covers at least a portion of the first structural member 431a to form a completed main body 431, and the cover 432 is formed simultaneously.

[0116] In one embodiment, Figure 8 As shown, the isolation cover 430 also includes two extension structures 4312, which extend from opposite sides of the main body 431 along the arrangement direction of the two side panels 451; each extension structure 4312 extends in a direction away from the push rod 410, and each extension structure 4312 wraps around one end of the side panel 451 close to the main body 431.

[0117] It should be understood that the shape of the extension structure 4312 can be adapted to the flat state of the side plate 451 to enhance the structural stability of the side plate 451 and the isolation cover 430 after injection molding.

[0118] like Figures 8 to 9As shown, a connection structure 433 is provided between the cover 432 and the adjacent extension structure 4312, and the connection structure 433 connects the cover 432 and the main body 431 and / or the extension structure 4312 to block the gap between the cover 432 and the main body 431 and / or the extension structure 4312. Exemplarily, the connection structure 433 connects the main body 431, the first plate 4322 and the extension structure 4312.

[0119] It should be noted that, on the one hand, the connection structure 433 can enhance the structural stability of the cover 432 relative to the main body 431. On the other hand, the connection structure 433 can avoid the existence of a gap between the outer wall of the cover 432 and the extension structure 4312 to ensure that the creepage path is effectively extended. Exemplarily, if the current creeps from the main body 431 to between the cover 432 and the extension structure 4312, the current needs to creep along the connection structure 433 until it reaches the first plate 4322.

[0120] like Figure 8 and Fig.10 As shown, along the axial direction of the push rod 410, a separation retaining wall 4311 is provided on the side of the main body 431 facing away from the push rod 410, and the separation retaining wall 4311 extends from the surface of the main body 431 in the direction facing away from the push rod 410; and along the radial direction of the push rod 410, the separation retaining wall 4311 is provided Figure 3 At least one side of the elastic member 440. The isolation retaining wall 4311 can be arranged in the current creeping path from the elastic member 440 to the auxiliary dynamic spring 420 to increase the current creeping path from the elastic member 440 to the auxiliary dynamic spring 420, or even the current creeping distance.

[0121] It should be understood that “creepage path” refers to the possible creeping trajectory of two metal parts between insulating surfaces, and “creepage distance” refers to the minimum creeping trajectory between two conductive parts measured along the insulating surface.

[0122] It is worth noting that in this embodiment, in the plane perpendicular to the direction Z, the isolation retaining wall 4311 can be designed as a local structure or a continuous structure, that is, the isolation retaining wall 4311 can be designed around the elastic member 440 to effectively isolate the elastic member 440. It is understandable that the isolation retaining wall 4311 can also limit the elastic member 440 in the plane perpendicular to the direction Z to improve the stability of the elastic member 440 and the isolation cover 430 after assembly.

[0123] Of course, the main body 431 of the isolation cover 430 may also be provided with Fig.10 The limiting structure 4313 shown is used to further limit the stability of the assembled elastic member 440. For example, when the elastic member 440 is a contact spring, the limiting structure 4313 can be a protrusion to extend into the hollow structure of the contact spring to assist in limiting the structural stability of the contact spring.

[0124] Furthermore, in order to enhance the stability of the cover shell 432 relative to the main body 431 , in a specific embodiment, the second plate 4323 and the isolation retaining wall 4311 may also be provided with a reinforcement structure.

[0125] In another embodiment, Figures 16 to 19 As shown, the openings 4321 on the two cover shells 432 are arranged along the diagonal line of the isolation cover 430, and the main body 431 cooperates with each cover shell 432 to form the opening 4321. This structural arrangement can facilitate the demoulding operation to reduce the difficulty of preparation and assembly.

[0126] When specifically set, the size of the opening 4321 in the direction of the axis of the vertical push rod 410 can be set according to demand. For example, it can be set larger. It should be noted that when the size of the opening 4321 is set larger, the isolation cover 430 can be miniaturized under the premise of meeting safety requirements. Specifically, when assembling the isolation cover 430 provided in this embodiment, the auxiliary lead-out piece 600 can be first placed into the internal space of the isolation cover 430 from the opening 4321, and then the isolation cover 430 is rotated in the direction of the axis of the vertical push rod 410 so that the isolation cover 430 is installed in place.

[0127] Of course, the size of the opening 4321 cannot be set too large to ensure the structural strength of the cover 432 so that it meets the isolation requirements.

[0128] like Figures 16 to 19 As shown, in this embodiment, there are two openings 4321 on the cover 432, and the other opening 4321 is referred to as an auxiliary opening 4325. Exemplarily, the auxiliary opening 4325 is connected to the main body 431, and the auxiliary openings 4325 on the two cover shells 432 are arranged along the second diagonal line, and the second diagonal line passes through the main body 431 and intersects with the first diagonal line; in the plane perpendicular to the axis of the push rod 410, the opening 4321 on each cover shell 432 is spaced from the auxiliary opening 4325, and the size of the auxiliary opening 4325 is smaller than the size of the opening 4321. The structural design of the auxiliary opening 4325 can further facilitate the demolding operation to reduce the difficulty of preparation and assembly.

[0129] like Fig.16 As shown, in a specific embodiment, the cover 432 includes: a first plate 4322 and a second plate 4323, the first plate 4322 is connected to the main body 431, and the extension direction of the first plate 4322 is perpendicular to the axis of the push rod 410; the second plate 4323 extends from the first plate 4322, and the extension direction of the second plate 4323 is perpendicular to the extension direction of the first plate 4322, and the second plate 4323 is provided with an opening 4321. Fig.18As shown, there is a gap between the two ends of the second plate 4323 and the main body 431 , and the gap forms the opening 4321 and the auxiliary port 4325 .

[0130] It is worth noting that since the cover 432 needs to rotate during the assembly process, the extension state of the second plate 4323 in the plane perpendicular to the axis of the push rod 410 can be set to an arc shape to save the space occupied by the cover 432, thereby improving the structural performance of the relay 10.

[0131] When assembling the various structural components in the push rod assembly 400 provided in the embodiment of the present application, as shown in FIG. Figures 17 to 19 As shown, the main body 431 is divided into a first structural member 431a ( Fig.17 ) and the second structural member 431b ( Fig.18 and Fig.19 ), wherein the first structural member 431a is formed in the first injection molding operation, and the second structural member 431b is formed in the second injection molding operation. Fig.17 and Fig.18 shown.

[0132] It is worth noting that after the first injection molding process, the push rod 410, the auxiliary spring 420 and the first structural member 431a form an integral structure. Afterwards, the second structural member 431b is prepared on the surface of the integral structure. The second structural member 431b covers at least a portion of the first structural member 431a to form a completed main body 431, and the cover 432 is formed simultaneously.

[0133] Of course, the push rod assembly 400 in this embodiment further includes: a contact bracket 450, which is connected to the isolation cover 430, and the contact bracket 450 follows the push rod 410. The contact bracket 450 can be connected to the push rod 410, the auxiliary dynamic spring 420 and the isolation cover 430 by integral injection molding to further improve the integration of the push rod assembly 400, thereby optimizing the following effect of each structural component and reducing the difficulty of assembly.

[0134] It is worth noting that Fig.15 As shown, the push rod assembly 400 provided in this embodiment is also provided with a contact support 450. The contact support 450 can be Fig.11 and Fig.12 The structural settings in are the same or different. In a specific example, Fig.15As shown, the side plates 451 and the top plate 453 are an integrated structure, and the two side plates 451 cooperate with the top plate 453 to form a U-shaped structure, the bottom plate 452 is partially covered in the main body 431, and the two ends of the bottom plate 452 in the length direction extend out of the main body 431; the contact bracket 450 includes a top plate 453 and two side plates 451 arranged opposite to each other, the two side plates 451 cooperate with the top plate 453 to form a U-shaped structure, and each side plate 451 is fixed to the bottom plate 452 on the side facing away from the top plate 453; and the arrangement direction of the two side plates 451 is perpendicular to the length direction of the auxiliary movable spring 421.

[0135] It is worth noting that, compared with the contact support 450 in another embodiment, the contact support 450 in this specific embodiment is in an inverted U shape, and the bottom plate 452 is fixed in the isolation cover 430 to be connected with the contact support 450. Specifically, each end of the bottom plate 452 extending out of the main body 431 is connected to the corresponding side plate 451 to improve the structural stability.

[0136] Please continue to refer to Figure 2 and Fig. 20 In the structure shown, the relay 10 provided by the embodiment of the present invention further includes an auxiliary lead-out member 600, the push rod 410 and the auxiliary lead-out member 600 penetrate the yoke iron plate 100, and the auxiliary lead-out member 600 is provided with an auxiliary static contact corresponding to the auxiliary moving contact 422 on the side of the yoke iron plate 100 facing the auxiliary moving spring 420. The auxiliary lead-out member 600 is used to contact or separate with the auxiliary moving spring 420 to monitor the closed / open state between the moving contact 311 and the static contact 322.

[0137] In a specific embodiment, the auxiliary lead-out member 600 and its corresponding auxiliary moving contact 422 can be in a normally open state.

[0138] It is worth noting that Figure 2 As shown, during the movement of the active spring 310, the auxiliary dynamic spring 420 moves with the active spring 310; when the moving contact 311 on the active spring 310 contacts the static contact 322, the auxiliary moving contact 422 on the auxiliary dynamic spring 420 contacts the auxiliary static contact; conversely, when the moving contact 311 on the active spring 310 is disengaged from the static contact 322, the auxiliary moving contact 422 on the auxiliary dynamic spring 420 is disengaged from the auxiliary static contact.

[0139] The contact and separation between the auxiliary moving contact 422 and the auxiliary static contact are further explained. When the two ends of the auxiliary moving spring 420 move to the moment of combining with the auxiliary static contact, the auxiliary static contacts in the detection circuit are connected, so that the main contacts (i.e., the moving contact 311 and the static contact 322) are detected to be connected; conversely, when the control coil of the high-voltage DC relay 10 stops being energized, the moving iron core moves in the opposite direction of the attraction under the elastic force of the reset spring, and at the same time, the auxiliary moving spring 420 moves away from the auxiliary static contact as the moving iron core is reset. When the two ends of the auxiliary moving spring 420 are separated from the auxiliary static contact, the detection circuit of the high-voltage DC relay 10 is disconnected, thereby realizing the detection of the separation of the main contacts (i.e., the moving contact 311 and the static contact 322).

[0140] The auxiliary lead-out member 600 and the yoke iron plate 100 are connected by Figure 2 as well as Figure 20 to Figure 22 The connection assembly 700 shown is connected. For example, Figures 2 to 5 As shown, the yoke plate 100 is provided with a through-hole structure, and the connecting component 700 is placed in the through-hole structure to fix the auxiliary lead-out component 600. Specifically, at the position where the auxiliary lead-out component 600 passes through the yoke plate 100, a ceramic component 710 is surrounded and fixed on the circumference of the auxiliary lead-out component 600, and a transition piece 720 is covered on the outer side of the ceramic component 710, and the transition piece 720 forms a convex structure on the side facing away from the magnetic circuit component 500. The convex structure extends from the side edge of the ceramic component 710 close to the magnetic circuit component 500 to the side facing away from the magnetic circuit component 500, and covers at least a portion of the surface of the ceramic component 710 on the side facing away from the magnetic circuit component 500. As shown Figures 3 to 5 As shown, the convex structure is provided with a through hole at the position where the auxiliary lead-out member 600 passes through, and the edge of the through hole formed by the transition piece 720 is folded toward the direction close to the ceramic piece 710 and abuts against the ceramic piece 710. The material of the transition piece 720 can be metal.

[0141] Knife edge welding technology can be used to fix the ceramic part 710 and the transition piece 720 to reduce welding stress and improve sealing performance. It should be understood that since only a small flange of the transition piece 720 contacts the ceramic part 710, the welding area between the transition piece 720 and the ceramic part 710 can be reduced to reduce welding stress and improve sealing performance.

[0142] The embodiment of the present invention also provides a method for preparing a push rod assembly 400 , which comprises: using an injection molding process to connect a push rod 410 and an auxiliary dynamic spring 420 , and forming an isolation cover 430 , wherein the isolation cover 430 covers an auxiliary dynamic contact 422 of the auxiliary dynamic spring 420 .

[0143] It should be noted that, in this embodiment, the push rod 410, the isolation cover 430 and the auxiliary spring 420 are formed into a whole through a single manufacturing process. The manufacturing method is simple to operate, can improve the operating efficiency and reduce the manufacturing cost.

[0144] Of course, the method for preparing the push rod assembly 400 can be used to prepare the push rod assembly 400 provided by any of the above technical solutions.

[0145] The embodiment of the present invention also provides a method for preparing a push rod assembly 400. Figures 1 to 22 refer to Fig.23 The structure shown, the preparation method of the push rod assembly 400 includes:

[0146] Step S2302: Using an injection molding process, a first structural member 431a is formed at a preset position of the push rod 410 and the auxiliary spring 420, such as Fig.11 As shown, the push rod 410 and the auxiliary dynamic spring 420 are connected through the first structural member 431a;

[0147] Step S2304: Using the injection molding process again, prepare the second structure 431b on the surface of the first structure 431a to form the isolation cover 430; Figure 8 and Fig. 9 As shown, the isolation cover 430 covers the auxiliary moving contact 422 of the auxiliary moving spring 420 to isolate the auxiliary moving contact 422 from the active spring 310 ; and the isolation cover 430 is used to extend the creepage distance from the active spring 310 to the auxiliary moving spring 420 .

[0148] It should be noted that the preparation method of the push rod assembly 400 provided in the embodiment of the present application can reduce the difficulty of preparation, improve the preparation efficiency, and improve the structural performance of the product.

[0149] When applying the method for preparing the push rod assembly 400 provided in the embodiment of the present invention, it is not necessary to provide a positioning opening for the mold to be inserted on the isolation cover 430, and it is not necessary to use a mold core to position the auxiliary dynamic spring 421. The push rod assembly 400 prepared by the preparation method provided in the embodiment of the present invention can extend the creepage distance from the active spring 310 to the auxiliary dynamic spring 420 to improve the insulation level of the relay 10, as well as improve the structural performance and safety performance of the relay 10. Moreover, when the creepage distance between the auxiliary dynamic spring 421 and the active spring 310 increases, the push rod assembly 400 can be used in an environment with a higher voltage to expand the application scenario.

[0150] Moreover, the push rod assembly 400 prepared by the preparation method provided by the embodiment of the present invention covers the auxiliary moving contact 422 through the isolation cover 430 to separate the auxiliary moving contact 422 from the active spring 310, so that the moving contact 311 on the active spring 310 and the auxiliary moving contact 422 in the auxiliary moving spring 420 are separated on both sides of the isolation cover 430 along the axial direction of the push rod 410. Accordingly, when the moving contact 311 and the static contact 322 separate to generate an arc, the isolation cover 430 can form an isolation protection for the auxiliary moving contact 422 to prevent the arc from contaminating the auxiliary moving contact 422.

[0151] In addition, in the preparation method provided by the embodiment of the present invention, the isolation cover 430 connects the auxiliary dynamic spring 420 and the push rod 410, so that the isolation cover 430 and the auxiliary dynamic spring 420 follow the push rod 410, the overall dimension chain is small, the control accuracy is high, and the consistency of the movement trajectory of the moving contact 311 and the auxiliary moving contact 422 is ensured. Moreover, the prepared isolation cover 430 follows the auxiliary dynamic spring piece 421, and there is no need to reserve the activity space of the auxiliary dynamic spring 420, and the structure is compact. In addition, the number of parts is simplified, the cost is reduced, the assembly process is reduced, and the risk of non-conduction caused by scraping is avoided.

[0152] In one embodiment, the preparation method of performing step S2302 and forming the first structural member 431a at the preset position of the push rod 410 and the auxiliary dynamic spring 420 by using an injection molding process further includes:

[0153] Providing a contact support 450;

[0154] By using an injection molding process, a first structural member 431 a is formed at one axial end of the push rod 410 , the auxiliary dynamic spring 420 , and a preset position of the contact bracket 450 .

[0155] It should be noted that the structural arrangement in this embodiment can further improve the integration of the push rod assembly 400, thereby optimizing the follow-up effect of each structural component, reducing the difficulty of assembly, and simplifying the number of structural components.

[0156] Finally, it should be noted that: it is understandable that the various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0157] In the embodiments of the invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the invention can be understood according to the specific circumstances.

[0158] In the description of the embodiments of the invention, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the embodiments of the invention.

[0159] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0160] The above are only preferred embodiments of the invention embodiments, and are not intended to limit the invention embodiments. For those skilled in the art, the invention embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the invention embodiments shall be included in the protection scope of the invention embodiments.

Claims

1. A push rod assembly, characterized in that: include: A push rod, an auxiliary dynamic spring and an isolation cover, wherein the auxiliary dynamic spring comprises an auxiliary dynamic spring sheet and an auxiliary dynamic contact, and the auxiliary dynamic contact is disposed at the end of the auxiliary dynamic spring sheet; The isolation cover connects the push rod and the auxiliary dynamic spring, so that the isolation cover and the auxiliary dynamic spring follow the push rod; The isolation cover covers the auxiliary moving contact to isolate the auxiliary moving contact from the active spring; and the isolation cover is used to extend the creepage distance from the active spring to the auxiliary moving spring.

2. The push rod assembly according to claim 1, characterized in that: Part of the auxiliary moving spring is wrapped inside the isolation cover, and the remaining auxiliary moving spring extends from the isolation cover; and the isolation cover covers the remaining part of the auxiliary moving spring extending from the isolation cover and the auxiliary moving contact.

3. The push rod assembly according to claim 2, characterized in that: The isolation cover comprises a main body and a cover shell, wherein: The main body is connected to the push rod and the auxiliary moving spring; The cover shell is connected to the main body, and the cover shell covers the remaining part of the auxiliary moving spring extending from the main body and the auxiliary moving contact.

4. The push rod assembly according to claim 3, characterized in that: Along the length direction of the auxiliary moving reed, the auxiliary moving contacts are provided at both ends of the auxiliary moving reed; the number of the cover shells is two, and the two cover shells are placed on opposite sides of the main body along the length direction of the auxiliary moving reed, and each of the cover shells covers the auxiliary moving contact at the same end of the auxiliary moving reed.

5. The push rod assembly according to claim 4, characterized in that: A first through hole is opened in the middle area of ​​the auxiliary movable spring along the length direction of the auxiliary movable spring, the main body covers the middle area, one axial end of the push rod is passed through the first through hole, and one axial end of the push rod is integrally formed in the main body.

6. The push rod assembly according to claim 4, characterized in that: The cover shell is provided with an opening in a direction perpendicular to the axial direction of the push rod.

7. The push rod assembly according to claim 6, characterized in that: Along the arrangement direction of the two cover shells, each of the cover shells is provided with an opening on a side facing away from the other cover shell.

8. The push rod assembly according to claim 7, characterized in that: The housing comprises: Two first plates, the two first plates are arranged opposite to each other, and the arrangement direction of the two first plates is perpendicular to the axial direction of the push rod and perpendicular to the length direction of the auxiliary movable spring; A second plate body, along the length direction of the auxiliary movable spring, the second plate body connecting two ends of the first plate bodies toward the main body; A top plate, the top plate connects the two first plate bodies and the second plate body to form a cavity for accommodating the auxiliary moving contact; and the top plate and the two first plate bodies form the opening on a side facing away from the main body.

9. The push rod assembly according to claim 6, characterized in that: The openings on the two cover shells are arranged along the diagonal line of the isolation cover, and the main body cooperates with each of the cover shells to form the openings.

10. The push rod assembly according to claim 9, characterized in that The housing comprises: a first plate body and a second plate body, wherein: The first plate is connected to the main body, and an extending direction of the first plate is perpendicular to the axis of the push rod; The second plate body extends from the first plate body, and an extending direction of the second plate body is perpendicular to an extending direction of the first plate body. The second plate body is provided with the opening.

11. The push rod assembly according to any one of claims 3 to 10, characterized in that: The push rod assembly further includes: a contact bracket, which is connected to the isolation cover and moves with the push rod.

12. The push rod assembly according to claim 11, characterized in that The contact support is connected to the push rod, the auxiliary dynamic spring and the isolation cover by integral injection molding.

13. The push rod assembly according to claim 11, characterized in that The contact support comprises a bottom plate, a top plate and two side plates arranged opposite to each other. Along the axial direction of the push rod, the two side plates are located on the same side of the bottom plate, and the top plate is connected to the other ends of the two side plates facing away from the bottom plate.

14. The push rod assembly according to claim 13, characterized in that The isolation cover also includes two extension structures, which extend from opposite sides of the main body along the arrangement direction of the two side plates; each extension structure extends in a direction away from the push rod, and each extension structure wraps around one end of the side plate close to the main body.

15. The push rod assembly according to claim 14, characterized in that A connecting structure is provided between the cover shell and the adjacent extending structure, and the connecting structure connects the cover shell and the main body and / or the extending structure to block a gap between the cover shell and the main body and / or the extending structure.

16. The push rod assembly according to any one of claims 3 to 10, characterized in that: Along the axial direction of the push rod, an elastic member is installed on the side of the isolation cover facing away from the push rod.

17. The push rod assembly according to claim 16, characterized in that Along the axial direction of the push rod, an isolation retaining wall is provided on the side of the main body facing away from the push rod, and the isolation retaining wall extends from the surface of the main body toward the direction away from the push rod; and along the radial direction of the push rod, the isolation retaining wall is provided on at least one side of the elastic member.

18. The push rod assembly according to any one of claims 1 to 10, characterized in that: The isolation cover is connected to the push rod and the auxiliary dynamic spring by integral injection molding.

19. A relay, characterized in that: Comprising a push rod assembly as described in any one of claims 1-18.

20. The relay according to claim 19, characterized in that It also includes a yoke plate and an auxiliary lead-out piece, wherein the auxiliary lead-out piece and a push rod in the push rod assembly penetrate the yoke plate, and the auxiliary lead-out piece is provided with an auxiliary static contact corresponding to the auxiliary moving contact on the side of the yoke plate facing the auxiliary moving spring.

21. A method for preparing a push rod assembly, characterized in that: The injection molding process is adopted to connect the push rod and the auxiliary dynamic spring to form an isolation cover, wherein the isolation cover covers the auxiliary dynamic contact of the auxiliary dynamic spring.

22. A method for preparing a push rod assembly, characterized in that: include: Using an injection molding process, a first structural member is formed at a preset position of the push rod and the auxiliary dynamic spring, and the push rod and the auxiliary dynamic spring are connected through the first structural member; The injection molding process is used again to prepare a second structural member on the surface of the first structural member to form an isolation cover; wherein the isolation cover covers the auxiliary moving contact of the auxiliary moving spring to isolate the auxiliary moving contact from the active spring; and the isolation cover is used to extend the creepage distance from the active spring to the auxiliary moving spring.

23. The method for preparing a push rod assembly according to claim 22, characterized in that: The method for preparing a first structural member by using an injection molding process at a preset position of a push rod and an auxiliary dynamic spring also includes: Providing a contact support; The first structural member is formed at one axial end of the push rod, the auxiliary dynamic spring and a preset position of the contact bracket by using an injection molding process.

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