Relay

Abstract

Disclosed in the present invention is a relay, comprising: an auxiliary contact set and a pushing rod set capable of reciprocating up and down, wherein the auxiliary contact set comprises auxiliary static contact rods and an elastic auxiliary contact piece; an insulating support is erected outside the pushing rod set, the auxiliary contact piece being fixed to the insulating support; the auxiliary contact piece is provided with contact ends and an opening and closing structure, one end of each auxiliary static contact rod abutting against the corresponding contact end all the time; and the pushing rod set is provided with an insulating shifting block, the insulating shifting block being capable of driving the opening and closing structure to break or close during the process of moving along with the pushing rod set, so as to enable the auxiliary contact set to switch between connection and disconnection. The relay of the present invention does not increase the size of a product, and can also ensure reliable high-low voltage insulation.

Description

relay Technical Field

[0001] The present invention relates to the technical field of switch electrical appliances, and in particular to a relay. Background Art

[0002] In addition to the main contacts, relays typically also have auxiliary contacts. The main contacts act as the circuit's on / off contacts, carrying high voltage and high current. The auxiliary contacts, acting as feedback contacts for the circuit's operation, typically operate in a low-voltage, low-current environment. To meet safety regulations, the main and auxiliary contacts are typically separated by increased spacing or additional structures.

[0003] For example, a Chinese invention patent application with publication number CN110164737A and publication date August 23, 2019, discloses an auxiliary contact structure and a high-voltage DC relay with auxiliary contacts. The invention patent application employs two auxiliary contact leads mounted on the top wall of a ceramic cover, with their respective bottom ends extending into the cavity of the ceramic cover. The auxiliary spring and mounting bracket are connected to form a single integral component via a plastic component, insulated and isolated from each other. While this invention patent application provides an auxiliary contact that isolates strong and weak currents, it places the auxiliary contacts at the top to achieve high- and low-voltage isolation. This increases the height of the product due to the auxiliary contact structure and operating distance, which does not meet the actual requirements of miniaturization. Furthermore, to address the high- and low-voltage isolation between the ceramic cover and the high-voltage contact, the ceramic cover adds insulation isolation features, which increases the difficulty of part molding and the cost. Furthermore, the auxiliary spring is insert-molded and fixed via a mounting bracket, making overall assembly difficult, requiring multiple transition pieces and resulting in large assembly errors. This results in low reliability of actual contact between the auxiliary contact leads and the auxiliary spring.

[0004] For example, the Chinese invention patent with announcement number CN210575737U and announcement date May 19, 2020, discloses a square ceramic DC contactor with auxiliary contacts and no polarity. This contactor has an isolation wall on one side of the interior of the ceramic cover, which separates the inner cavity of the ceramic cover into a large cavity and a small cavity. The large cavity houses a moving contact piece and a push rod assembly, while the small cavity houses a microswitch assembly, achieving excellent high- and low-voltage insulation. However, this technical solution increases the structure of the ceramic cover, greatly increasing the product size, and making the processing of the ceramic cover more difficult, resulting in high manufacturing costs.

[0005] In addition, the prior art has also designed auxiliary contact structures that will not increase the size of the product, such as a high-capacity relay with auxiliary contacts disclosed in the Chinese invention patent application with publication number CN112435895A and publication date 2021.03.02, wherein the auxiliary contact assembly includes an auxiliary moving spring insulated from the moving contact and at least one set of lead-out rods passing through the side wall of the housing, and the auxiliary moving spring includes a mounting plate coaxially fixed on the insulating plate and two auxiliary moving contacts arranged on the same side or opposite sides of the mounting plate. Although this structure does not increase the volume of the product, it sets the auxiliary moving spring on the insulating plate, and the spacing between the auxiliary moving spring and the high-voltage end (i.e., the mounting bracket of the moving contact) is limited, the creepage distance is small, the reliability of the high and low voltage insulation is not high, and breakdown is prone to occur. Therefore, it is necessary to improve the prior art to overcome the defects in the prior art.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a relay that does not increase the product size while ensuring reliable high and low voltage insulation.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a relay, comprising: an auxiliary contact group and a push rod group that can move back and forth up and down, the auxiliary contact group comprising an auxiliary static contact rod and an elastic auxiliary contact piece, an insulating bracket is provided outside the push rod group, the auxiliary contact piece is fixed to the insulating bracket, the auxiliary contact piece is provided with a contact end and an opening and closing structure, one end of the auxiliary static contact rod is always in contact with the contact end, the push rod group is provided with an insulating shift block, and the insulating shift block can drive the opening and closing structure to disconnect or close in the process of following the movement of the push rod group, so as to realize the switching of the auxiliary contact group between connection and disconnection.

[0009] As a further improvement of the present invention, the opening and closing structure includes a first tongue and a second tongue, and the insulating block is used to push at least one of the first tongue and the second tongue to undergo elastic deformation, thereby achieving the separation or closing of the first tongue and the second tongue.

[0010] As a further improvement of the present invention, the second tongue piece is overlapped on the top of the first tongue piece; or one end of the second tongue piece extends to the bottom of the first tongue piece, and in a natural state, the second tongue piece and the first tongue piece do not contact each other; the insulating block is arranged directly below the second tongue piece.

[0011] As a further improvement of the present invention, the ends of the first tongue piece and the second tongue piece that are close to each other are bent in opposite directions to form two arc-shaped tongue pieces. In a natural state, the two arc-shaped tongue pieces are in contact with each other.

[0012] As a further improvement of the present invention, the auxiliary contact piece includes two split auxiliary springs, and the contact end is provided at one end of each of the two auxiliary springs, and the first tongue piece and the second tongue piece are respectively provided at the other end of each of the two auxiliary springs; the auxiliary static contact rods are correspondingly provided with two, respectively abutting against the two contact ends, and causing the two contact ends to undergo elastic deformation.

[0013] As a further improvement of the present invention, the two auxiliary springs are integrally injection-molded with the insulating bracket, and a side support plate of the insulating bracket is provided with an air avoidance hole. The two contact ends, the first tongue piece and the second tongue piece all protrude from the insulating bracket and are located in the air avoidance hole.

[0014] As a further improvement of the present invention, the insulating bracket is provided with a first isolation wall in the air avoidance hole, and the first isolation wall is located between the two contact ends and the push rod group.

[0015] As a further improvement of the present invention, the push rod group includes an insulating seat, and a second isolation wall is provided on the side of the insulating seat close to the auxiliary contact group. The second isolation wall is arranged opposite to the opening and closing structure, and the upper end of the second isolation wall is not lower than the lower end of the first isolation wall.

[0016] As a further improvement of the present invention, the insulating shifting block is formed by integrally extending from one side of the insulating seat toward the inside of the air-avoiding hole.

[0017] As a further improvement of the present invention, the two auxiliary springs are integrally injection molded with the insulating bracket, and a side support plate of the insulating bracket is provided with an air avoidance hole. The two contact ends, the first tongue piece and the second tongue piece all protrude from the insulating bracket, and the first tongue piece and the second tongue piece are both in the air avoidance hole, and the two contact ends are both at the top of the side support plate.

[0018] The beneficial effects of the present invention are:

[0019] 1) The present invention provides a relay, in which an auxiliary contact piece is arranged on an insulating bracket, an auxiliary static contact rod is always in contact with the contact end of the auxiliary contact piece, and an insulating shift block is used to shift the opening and closing structure of the auxiliary contact piece when the push rod group is actuated, so as to realize the connection or disconnection of the auxiliary contact group. On the basis of not increasing the original size of the relay, the distance between the auxiliary contact group and the main contact group can be set to be larger by relying on the insulating bracket. In particular, with the cooperation of a first isolation wall provided on the insulating bracket and a second isolation wall provided on the insulating seat, the auxiliary contact piece and the high-voltage part on the push rod group can be further effectively isolated, the creepage distance is increased, the high and low voltages are less likely to be broken down, and the high and low voltages are isolated.

[0020] 2) The present invention can realize two auxiliary contact group structures of normally open or normally closed by replacing different auxiliary contact pieces, and can achieve good interchangeability to meet customer needs.

[0021] 3) The auxiliary contact piece in the present invention is directly insert-molded in the insulating bracket, and the insulating shift block that realizes the switching action is set on the push rod group. Both parts use the upper surface of the magnetic pole piece as a reference, involving fewer parts, and there will not be too many transition parts in the assembly. The assembly error is small, ensuring good contact reliability and reducing the manufacturing cost of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a front view of a first embodiment of a relay according to the present invention;

[0023] FIG2 is a cross-sectional view of a first embodiment of a relay according to the present invention;

[0024] FIG3 is a perspective view of the first embodiment of the relay according to the present invention with the ceramic cover removed;

[0025] FIG4 is a perspective view of the auxiliary contact piece and the insulating bracket in the first embodiment of the relay of the present invention;

[0026] FIG5 is a perspective view of the auxiliary contact piece in the first embodiment of the relay of the present invention;

[0027] FIG6 is a perspective view of the push rod assembly and the movable contact piece in the first embodiment of the relay of the present invention;

[0028] FIG7 is a perspective view of a relay embodiment 1 of the present invention in a closed state;

[0029] FIG8 is a front view of the second embodiment of the relay of the present invention after removing the ceramic cover;

[0030] FIG9 is a perspective view of the auxiliary contact piece in the second embodiment of the relay of the present invention;

[0031] FIG10 is a perspective view of a second embodiment of a relay according to the present invention in a closed state;

[0032] FIG11 is a perspective view of the auxiliary static contact rod, the auxiliary contact piece and the insulating bracket in the third embodiment of the relay of the present invention;

[0033] FIG12 is a perspective view of the fourth embodiment of the relay of the present invention after removing the ceramic cover;

[0034] FIG13 is a perspective view of the auxiliary contact piece in the fourth embodiment of the relay of the present invention;

[0035] FIG14 is a perspective view of the auxiliary contact piece in the fifth embodiment of the relay of the present invention.

[0036] The following description is made with reference to the accompanying drawings:

[0037] 1. Auxiliary static contact rod; 2. Auxiliary contact piece; 21. Auxiliary spring; 201. Contact end; 202. First tongue piece; 203. Second tongue piece; 204. Material strip connection point; 2023. Arc-shaped tongue piece; 3. Insulation bracket; 31. Side support plate; 301. Air avoidance hole; 302. First isolation wall; 4. Insulation seat; 401. Insulation shift block; 402. Second isolation wall; 5. Static iron core; 6. Static contact; 7. Moving contact piece; 8. Ceramic cover; 9. Pole piece; 10. Upper armature; 11. Lower armature; 12. Support frame; 13. Contact spring; 14. Push rod; 15. Moving iron core. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] Example 1

[0040] Referring to Figures 1 to 7, the present invention provides a relay comprising: a ceramic cover 8, a main contact group, an auxiliary contact group, a push rod group, and a magnetic pole piece 9. The ceramic cover 8 is fixed to the top of the magnetic pole piece 9, and the main contact group comprises two static contacts 6 and a moving contact piece 7. The two static contacts 6 are fixed side by side to the top of the ceramic cover 8, and the lower ends of the two static contacts 6 extend downward into the inner cavity of the ceramic cover 8. The upper part of the push rod group is accommodated in the inner cavity of the ceramic cover 8, and the push rod group can reciprocate up and down; the moving contact piece 7 is installed in the upper part of the push rod group, and the two static contacts 6 are arranged opposite to each other at both ends of the moving contact piece 7.

[0041] As shown in Figures 2 and 3, an insulating bracket 3 mounted on the outer side of the upper part of the push rod group is fixedly mounted on the magnetic pole piece 9. The auxiliary contact group includes an auxiliary static contact rod 1 and an elastic auxiliary contact piece 2. The auxiliary contact piece 2 is fixed to the insulating bracket 3, and the auxiliary contact piece 2 is provided with a contact end 201 and an opening and closing structure. The auxiliary static contact rod 1 is fixed to the ceramic cover 8, and one end of the auxiliary static contact rod 1 extends into the inner cavity of the ceramic cover 8 and always abuts against the contact end 201; the other end of the auxiliary static contact rod 1 protrudes from the outer wall of the ceramic cover 8. The push rod group is provided with an insulating shift block 401. The insulating shift block 401 can drive the opening and closing structure to disconnect or close in the process of following the movement of the push rod group, so as to realize the switching of the auxiliary contact group between on and off. The present invention arranges the auxiliary contact piece 2 on the insulating bracket 3, and utilizes the insulating shift block 401 to shift the auxiliary contact piece 2 when the push rod group is actuated to connect or disconnect the auxiliary contact group. Without increasing the original size of the relay, the insulating bracket 3 can increase the distance between the auxiliary contact group and the main contact group, and effectively isolate the high and low voltages, thereby ensuring the reliability of the high and low voltage insulation.

[0042] Furthermore, the opening and closing structure includes a first tongue 202 and a second tongue 203 , and the insulating block 401 is used to push at least one of the first tongue 202 and the second tongue 203 to undergo elastic deformation, thereby realizing the separation or closing of the first tongue 202 and the second tongue 203 .

[0043] In this embodiment, the auxiliary contact group has a normally closed structure. Specifically, as shown in Figures 4 and 5, the first tongue 202 and the second tongue 203 are both flat, ribbon-shaped metal sheets. One end of the second tongue 203 overlaps the top of the first tongue 202, and the second tongue 203 will produce a certain degree of elastic deformation, so that a certain pressure is applied during the overlap, ensuring stable contact. Preferably, the overlapping length is greater than twice the width of the sheet to ensure good contact; at the same time, the length of the second tongue 203 is greater than that of the first tongue 202, thereby increasing the length of the deformation arm of the second tongue 203, reducing working stress and improving the operating life.

[0044] Among them, the insulating shift block 401 is arranged directly below the second tongue piece 203. When the relay is in the released state, there is a certain gap between the insulating shift block 401 and the second tongue piece 203; when the relay switches from the released state to the attracted state, the insulating shift block 401 moves upward with the push rod group, and then pushes the second tongue piece 203 upward, so that the second tongue piece 203 is separated from the first tongue piece 202, thereby realizing the switching of the auxiliary contact group from normally closed to open.

[0045] Referring to Figure 5 , the auxiliary contact piece 2 comprises two separate auxiliary springs 21. These auxiliary springs 21 are thin, elastic metal sheets, preferably made of high-yield-strength stainless steel or beryllium copper. Each of the two auxiliary springs 21 has a contact tip 201 at one end. The other end of one auxiliary spring 21 is configured as a first tongue 202, while the other end of the other auxiliary spring 21 is configured as a second tongue 203.

[0046] In this embodiment, two auxiliary static contact rods 1 are provided. Both auxiliary static contact rods 1 are arranged vertically and brazed to the top of the ceramic cover 8. The lower ends of the two auxiliary static contact rods 1 abut against the top surfaces of the two contact ends 201, respectively, causing both contact ends 201 to undergo elastic deformation to ensure good contact reliability.

[0047] Of course, in other embodiments of the present invention, the two auxiliary static contact rods 1 can also be arranged in parallel in the horizontal direction and brazed and fixed to the side wall of the ceramic cover 8, and the inner ends of the two auxiliary static contact rods 1 can respectively abut the top surfaces of the two contact ends 201.

[0048] Referring again to Figures 4 and 5 , the insulating bracket 3 is made of plastic, and the two auxiliary springs 21 are integrally injection-molded with the insulating bracket 3. A tooth-shaped strip connection point 204 is provided on the opposing sides of the two contact ends 201. This strip connection point 204 is formed when the strip is broken. Before injection molding, the two auxiliary springs 21 are connected by a connecting strip, forming an overall annular shape. After injection molding, the strip is punched out to form two separate auxiliary springs 21. Utilizing the strip facilitates the integral injection molding of the two auxiliary springs 21 and the insulating bracket 3.

[0049] Among them, two side support plates 31 are provided on the insulating bracket 3, and the two side support plates 31 are respectively on the outside of the two long sides of the moving contact piece 7; an air avoidance hole 301 is provided at the bottom of one of the side support plates 31, and the two contact ends 201, the first tongue piece 202 and the second tongue piece 203 all protrude from the insulating bracket 3, and the first tongue piece 202 and the second tongue piece 203 respectively extend from the two opposite vertical walls of the air avoidance hole 301 toward the air avoidance hole 301; similarly, the two contact ends 201 respectively extend from the two opposite vertical walls of the air avoidance hole 301 toward the air avoidance hole 301, and the two contact ends 201 are respectively above the first tongue piece 202 and the second tongue piece 203, and the two contact ends 201 also extend in the direction away from the push rod group and protrude from the outer wall of the side support plate 31, and the two auxiliary static contact rods 1 vertically downward along the side support plate 31 and respectively abut against the two contact ends 201.

[0050] Referring to Figures 3, 4 and 6, the push rod group includes an insulating seat 4 made of plastic material, and the insulating shift block 401 is formed by extending from one side of the insulating seat 4 toward the air avoidance hole 301. The insulating bracket 3 is provided with a first isolation wall 302 in the air avoidance hole 301, and the first isolation wall 302 is located between the two contact ends 201 and the push rod group. A second isolation wall 402 is provided on the side of the insulating seat 4 close to the auxiliary contact group. The second isolation wall 402 is arranged opposite to the opening and closing structure, and the upper end of the second isolation wall 402 is not lower than the lower end of the first isolation wall 302. By providing the first isolation wall 302 and the second isolation wall 402, the present invention can further effectively isolate the auxiliary contact piece 2 and the high-voltage part on the push rod group, increase the creepage distance, and prevent breakdown between the high and low voltages, thereby achieving high and low voltage insulation.

[0051] Referring to Figure 2 , the relay of the present invention also includes an anti-short-circuit assembly, comprising an upper armature 10 and a lower armature 11. The upper armature 10 is integrally injection-molded within the insulating bracket 3, while the lower armature 11 is mounted to the upper portion of the push rod assembly. The upper armature 10 and the lower armature 11 are positioned vertically opposite each other. When the relay is in the closed state, the movable contact 7 bridges the two stationary contacts 6. Current flowing through the movable contact 7 generates a spiral magnetic field, which magnetizes the upper armature 10 and the lower armature 11. This creates an attractive force between the upper armature 10 and the lower armature 11, which acts on the movable contact 7, providing an upward compensating force to overcome the electrodynamic repulsion, thereby improving the short-circuit resistance.

[0052] Referring to Figure 6 , the push rod assembly also includes a support frame 12, a contact spring 13, and a push rod 14. The upper end of the push rod 14 and the lower end of the support frame 12 are integrally injection-molded within the insulating base 4, and the movable contact piece 7 extends transversely across the support frame 12. The lower armature 11 is U-shaped and fits over the bottom of the movable contact piece 7 from bottom to top. The side walls of the lower armature 11 wrap around the sides of the movable contact piece 7 and protrude upward from the relief windows provided on both sides of the support frame 12. The two ends of the contact spring 13 elastically abut the insulating base 4 and the lower armature 11, respectively, and force the movable contact piece 7 upward against the top of the support frame 12.

[0053] Referring to Figure 2 again, the relay also includes a static iron core 5, a moving iron core 15 and an electromagnetic part (not shown in the figure). The static iron core 5 is fixed to the bottom of the magnetic pole piece 9, and the moving iron core 15 is arranged relatively spaced below the static iron core 5. The lower end of the push rod 14 passes downward through the magnetic pole piece 9 and the static iron core 5 and is fixedly connected to the moving iron core 15; the electromagnetic part is sleeved on the outside of the static iron core 5 and the moving iron core 15.

[0054] When the electromagnetic part is working, the magnetized moving iron core 15 is attracted by the static iron core 5 and moves upward, and is finally attracted to the bottom of the static iron core 5. During this process, the moving iron core 15 pushes the moving contact piece 7 upward through the pushing rod group, so that the moving contact piece 7 contacts and conducts with the two static contacts 6; at the same time, the insulating shift block 401 follows the pushing rod group to move upward, and then pushes the second tongue piece 203 upward, so that the second tongue piece 203 is separated from the first tongue piece 202 (as shown in Figure 7), realizing the switching of the auxiliary contact group from normally closed to open. When the electromagnetic part is not working, the magnetic attraction between the moving iron core 15 and the static iron core 5 disappears. Under the action of the reset spring between the moving iron core 15 and the static iron core 5, the moving iron core 15 moves downward and disconnects the moving contact piece 7 from the two static contacts 6 through the push rod group; at the same time, the insulating shift block 401 follows the push rod group to move downward and leave the second tongue piece 203. The second tongue piece 203 returns to the state of overlapping on the first tongue piece 202 under the action of its own elastic force (as shown in Figure 3), realizing the switching of the auxiliary contact group from disconnection to closure.

[0055] Example 2

[0056] Referring to Figures 8 to 10 , this embodiment differs from the first embodiment in that the auxiliary contact assembly has a normally open structure. Specifically, one end of the second tongue 203 in this embodiment extends below the first tongue 202. In the natural state, a certain gap remains between the second tongue 203 and the first tongue 202, preventing them from contacting each other. This achieves a normally open structure for the auxiliary contact assembly.

[0057] The insulating block 401 remains directly below the second tongue 203. When the relay switches from the released state to the closed state, the insulating block 401 moves upward with the push rod assembly, thereby pushing the second tongue 203 upward, causing the second tongue 203 to contact the first tongue 202 (as shown in Figure 10), and switching the auxiliary contact group from normally open to closed. When the relay switches from the closed state to the released state, the insulating block 401 moves downward with the push rod assembly, separating from the second tongue 203. The second tongue 203 returns to a state without contact with the first tongue 202 under its own elastic force (as shown in Figure 8), and the auxiliary contact group switches from closed to open.

[0058] It can be seen that the present invention can realize two auxiliary contact group structures of normally open or normally closed by replacing different auxiliary contact pieces 2, and can achieve good interchangeability to meet customer needs.

[0059] Example 3

[0060] Referring to Figure 11 , this embodiment differs from either the first or second embodiment in the structure of the auxiliary contact piece 2. Specifically, the height of the two auxiliary springs 21 is increased, allowing both contact ends 201 to protrude from the top of the side support plate 31 of the insulating bracket 3, correspondingly shortening the auxiliary static contact rod 1. The first and second tongues 202, 203 remain within the clearance hole 301. This structural design reduces the length of the auxiliary static contact rod 1 while increasing the length of the two auxiliary springs 21 embedded within the insulating bracket 3. This also allows for both normally open and normally closed auxiliary contact assembly configurations.

[0061] Example 4

[0062] Referring to Figures 12 and 13 , this embodiment differs from the first embodiment in the structure of the auxiliary contact piece 2. Specifically, the height of the two auxiliary springs 21 is increased, allowing both contact ends 201 to protrude from the top of the side support plate 31 of the insulating bracket 3, correspondingly shortening the auxiliary static contact rod 1. The first and second tongues 202, 203 remain within the clearance hole 301. However, the first and second tongues 202, 203 are no longer flat strips as in the first embodiment. In this embodiment, the ends of the first and second tongues 202, 203 that approach each other are bent in opposite directions to form two curved tongues 2023. In their natural state, the two curved tongues 2023 rest back to back against each other.

[0063] The insulating shift block 401 is located directly below the contact point of the two curved tongues 2023. When the relay switches from the released state to the closed state, the insulating shift block 401 moves upward with the push rod assembly to between the two curved tongues 2023, pushing them apart and switching the auxiliary contact assembly from normally closed to open. When the relay switches from the closed state to the released state, the insulating shift block 401 moves downward with the push rod assembly, moving away from between the two curved tongues 2023. The two auxiliary springs 21, under their own elastic force, restore the two curved tongues 2023 to their back-to-back position (as shown in Figure 12), switching the auxiliary contact assembly from open to closed.

[0064] Example 5

[0065] 14 , the difference between this embodiment and the first embodiment lies in the structure of the auxiliary contact piece 2. Specifically, the first tongue piece 202 and the second tongue piece 203 are no longer flat strips as in the first embodiment. In this embodiment, the ends of the first tongue piece 202 and the second tongue piece 203 that are close to each other are bent in opposite directions to form two arc-shaped tongue pieces 2023. In a natural state, the two arc-shaped tongue pieces 2023 are back-to-back and abutted against each other.

[0066] The insulating shift block 401 is located directly below the contact point of the two curved tongues 2023. When the relay switches from the released state to the closed state, the insulating shift block 401 moves upward with the push rod assembly to between the two curved tongues 2023, pushing them apart and switching the auxiliary contact assembly from normally closed to open. When the relay switches from the closed state to the released state, the insulating shift block 401 moves downward with the push rod assembly, moving away from between the two curved tongues 2023. The two auxiliary springs 21, under their own elastic force, restore the two curved tongues 2023 to their back-to-back position (as shown in Figure 12), switching the auxiliary contact assembly from open to closed.

[0067] Thus, it can be seen that the relay of the present invention sets the auxiliary contact piece 2 on the insulating bracket 3, and the auxiliary static contact rod 1 always abuts the contact end 201 of the auxiliary contact piece 2. When the push rod group is actuated, the insulating shift block 401 is used to shift the opening and closing structure of the auxiliary contact piece 2 to realize the connection or disconnection of the auxiliary contact group. On the basis of not increasing the original size of the relay, the insulating bracket 3 can be used to set the distance between the auxiliary contact group and the main contact group to be larger. In particular, under the cooperation of the first isolation wall 302 set on the insulating bracket 3 and the second isolation wall 402 set on the insulating seat 4, the auxiliary contact piece 2 and the high-voltage part on the push rod group can be further effectively isolated, the creepage distance is increased, and the high and low voltages are less likely to be broken down, thereby realizing high and low voltage insulation. At the same time, the present invention can realize two auxiliary contact group structures of normally open or normally closed by replacing different auxiliary contact pieces 2, and can achieve good interchangeability to meet customer needs. The auxiliary contact piece 2 in the present invention is directly insert-molded in the insulating bracket 3, and the insulating shift block 401 for realizing the switching action is set on the push rod group. Both parts are based on the upper surface of the magnetic pole piece 9. There are fewer parts involved, and there will not be too many transition parts in the assembly. The assembly error is small, which ensures good contact reliability and reduces the manufacturing cost of parts.

[0068] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A relay, comprising an auxiliary contact group and a push rod group capable of reciprocating up and down, wherein the auxiliary contact group includes an auxiliary static contact rod (1) and an elastic auxiliary contact piece (2), and is characterized in that: An insulating bracket (3) is provided outside the push rod group. The auxiliary contact piece (2) is fixed to the insulating bracket (3). The auxiliary contact piece (2) is provided with a contact end (201) and an opening and closing structure. One end of the auxiliary static contact rod (1) always abuts against the contact end (201). The push rod group is provided with an insulating dial (401). During the movement following the push rod group, the insulating dial (401) can drive the opening and closing structure to break or close, so as to realize the switching between connection and disconnection of the auxiliary contact group.

2. The relay according to claim 1, wherein: The opening and closing structure includes a first tongue piece (202) and a second tongue piece (203). The insulating dial (401) is used to push at least one of the first tongue piece (202) and the second tongue piece (203) to elastically deform, thereby realizing the breaking or closing of the first tongue piece (202) and the second tongue piece (203).

3. The relay according to claim 2, characterized in that: The second tongue piece (203) overlaps on the top of the first tongue piece (202); or one end of the second tongue piece (203) extends below the first tongue piece (202), and in the natural state, the second tongue piece (203) and the first tongue piece (202) do not contact each other; the insulating dial (401) is arranged directly below the second tongue piece (203).

4. The relay according to claim 2, characterized in that: One end of the first tongue piece (202) and the second tongue piece (203) close to each other are bent in opposite directions to form two arc-shaped tongue pieces (2023). In the natural state, the two arc-shaped tongue pieces (2023) are in contact with each other.

5. The relay according to claim 2, wherein: The auxiliary contact piece (2) includes two separate auxiliary spring pieces (21). One end of each of the two auxiliary spring pieces (21) is provided with the contact end (201). The first tongue piece (202) and the second tongue piece (203) are respectively arranged at the other ends of the two auxiliary spring pieces (21); the auxiliary static contact rods (1) are correspondingly arranged in two, respectively abutting against the two contact ends (201), and causing elastic deformation of both contact ends (201).

6. The relay according to claim 5, characterized in that: The two auxiliary spring pieces (21) and the insulating bracket (3) are integrally injection-molded. An avoidance hole (301) is provided on the side support plate (31) of the insulating bracket (3). The two contact ends (201), the first tongue piece (202) and the second tongue piece (203) all protrude from the insulating bracket (3) and are located in the avoidance hole (301).

7. The relay according to claim 6, wherein: The insulating bracket (3) is provided with a first partition wall (302) inside the avoidance hole (301). The first partition wall (302) is located between the two contact ends (201) and the push rod group.

8. The relay according to claim 7, characterized in that: The push rod group includes an insulating seat (4). A second partition wall (402) is provided on one side of the insulating seat (4) close to the auxiliary contact group. The second partition wall (402) is arranged opposite to the opening and closing structure, and the upper end of the second partition wall (402) is not lower than the lower end of the first partition wall (302).

9. The relay according to claim 8, wherein: The insulating shifting block (401) integrally extends from one side of the insulating seat (4) towards the clearance hole (301).

10. The relay according to claim 5, characterized in that: The two auxiliary reed pieces (21) are integrally injection-molded with the insulating bracket (3). A clearance hole (301) is provided on the side support plate (31) of the insulating bracket (3). The two contact ends (201), the first tongue piece (202), and the second tongue piece (203) all protrude from the insulating bracket (3), and the first tongue piece (202) and the second tongue piece (203) are both located within the clearance hole (301). The two contact ends (201) are both located at the top of the side support plate (31).

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