Relay

Abstract

The utility model relates to the technical field of electronic control devices, in particular to a relay, which comprises a contact structure, an insulating cover and a protective structure, the contact structure comprises a plurality of static contacts and a movable contact piece, one ends of the plurality of static contacts and the movable contact piece are accommodated in the insulating cover, and two ends of the movable contact piece can be contacted with or disconnected from the static contacts; the protection structure is located outside the insulation cover, at least part of the protection structure is arranged on the circumferential side wall of the insulation cover, at least part of the protection structure can generate elastic deformation and abut against the circumferential side wall of the insulation cover so as to apply pre-pressure towards an inner cavity of the insulation cover to the insulation cover, and the pre-pressure can counteract part of outward impact force. Meanwhile, the insulation cover is limited to be opened outwards, the insulation cover is effectively protected, particularly the weak circumferential side wall of the insulation cover can be protected, the structural strength of the insulation cover is enhanced, and the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic control devices, in particular to a relay. Background Art

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

[0003] In related technologies, the contact system of high-voltage DC relays requires an insulating cover. To ensure the reliability of the contact resistance, a large number of products use a ceramic insulating cover. This cover is also filled with a gas such as hydrogen or nitrogen at a certain pressure to assist in arc extinguishing. When the contact system arcs violently during a short circuit, the air pressure within the insulating cover rises rapidly. If the insulating cover's structural strength is insufficient, the safety performance of the relay will be affected. Utility Model Content

[0004] The embodiment of the utility model provides a relay to improve the safety performance of the relay.

[0005] The relay provided by the embodiment of the present invention includes a contact structure, an insulating cover and a protective structure. The contact structure includes a plurality of stationary contacts and a movable contact piece. One end of the plurality of stationary contacts and the movable contact piece are both accommodated in the insulating cover. Both ends of the movable contact piece can be in contact with or disconnected from the stationary contacts.

[0006] The protective structure is located outside the insulating cover, and at least a portion of the protective structure is arranged on the circumferential side wall of the insulating cover. At least a portion of the protective structure can undergo elastic deformation and abut against the circumferential side wall of the insulating cover to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

[0007] According to some embodiments of the present invention, the protective structure includes an elastic frame structure, which is arranged around the circumferential side wall of the insulating cover; the insulating cover has a height direction, and along the height direction of the insulating cover, the elastic frame structure extends from one end of the insulating cover to the other end; or, the elastic frame structure includes a plurality of sub-frames, and the plurality of sub-frames are arranged at intervals along the height direction of the insulating cover.

[0008] According to some embodiments of the present invention, the elastic frame structure has at least one side group, at least one of the side groups includes two opposite side portions, and the two side portions are respectively located on both sides of the insulating cover to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

[0009] According to some embodiments of the present invention, the number of the side groups is two, and the two side groups are respectively a first side group and a second side group, the first side group includes two opposite first side portions, and the second side group includes two opposite second side portions, and the two first side portions and the two second side portions can both undergo elastic deformation to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

[0010] According to some embodiments of the present invention, the number of the side groups is two, and the two side groups are respectively a first side group and a third side group, the first side group includes two opposite first side portions, and the third side group includes two opposite third side portions, and both of the two first side portions can undergo elastic deformation to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover; the two third side portions are in contact with the insulating cover.

[0011] According to some embodiments of the present invention, the relay further includes a permanent magnet, which is located between the third side portion and the circumferential side wall of the insulating cover, and the third side portion is in contact with the circumferential side wall of the insulating cover through the permanent magnet.

[0012] According to some embodiments of the present invention, the third side portion is provided with a positioning protrusion, and the positioning protrusion is used to position the permanent magnet.

[0013] According to some embodiments of the present invention, a reinforcing rib is provided between the first side portion and the third side portion.

[0014] According to some embodiments of the present invention, the elastic frame structure is made of metal.

[0015] According to some embodiments of the present invention, the elastic frame structure is an integrally formed structure, or the elastic frame structure includes a bendable plate-like structure having two ends, and the two ends are fixedly connected together to form the elastic frame structure.

[0016] According to some embodiments of the present invention, there are multiple protective structures, and the multiple protective structures are sequentially arranged on the circumferential side wall of the insulating cover.

[0017] According to some embodiments of the present invention, the relay further includes a housing, and the insulating cover and the protective structure are both installed inside the housing.

[0018] According to some embodiments of the present invention, the relay further includes a yoke plate and a frame plate; the insulating cover is made of ceramic, and the yoke plate is connected to the insulating cover through the frame plate; the protective structure is located on the yoke plate, or the protective structure is located on the frame plate.

[0019] After long-term observation, testing, and research, the inventors discovered that the main reason for the insufficient structural strength of the insulation cover in existing relays is that, within the limited product space and given the specific factors such as the insulation cover's size, material, and molding process, the strength of the insulation cover, particularly for ceramic materials, can only be increased to a certain extent. As users' short-circuit current requirements continue to increase, the insulation cover's cavity cannot meet these requirements.

[0020] Based on this, one embodiment of the above utility model has at least the following advantages or beneficial effects:

[0021] (1) In the relay provided by the embodiment of the present invention, one end of a plurality of static contacts and a moving contact piece are all accommodated in the insulating cover. Since the protective structure is located outside the insulating cover, and at least a part of the protective structure can undergo elastic deformation and abut against the circumferential side wall of the insulating cover, a pre-pressure toward the inner cavity of the insulating cover can be applied to the insulating cover. The pre-pressure can offset a part of the outward impact force, which is beneficial to improving the safety performance. At the same time, it limits the insulating cover from stretching outward, effectively protecting the insulating cover, especially protecting the relatively weak circumferential side wall of the insulating cover, thereby enhancing the structural strength of the insulating cover and improving the safety performance.

[0022] (2) The relay provided in the embodiment of the present invention has a protective structure including an elastic frame structure, which is arranged around the circumferential side wall of the insulating cover; the elastic frame structure can be an integrally formed structure, which has a protective space closed along the circumference, and the insulating cover is located in the protective space. When the huge pressure borne by the insulating cover is transmitted to the protective structure, the integral elastic frame structure can apply a more uniform and stable pre-pressure to the inner cavity of the insulating cover from all sides, effectively protecting the insulating cover and improving safety performance.

[0023] (3) In the relay provided by the embodiment of the present invention, the elastic frame structure includes a plurality of sub-frames, and the plurality of sub-frames are spaced apart along the height direction of the insulating cover. This approach can reduce the material consumption of the elastic frame structure, thereby reducing the overall weight of the relay and lowering production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is an exploded view of a relay provided by an embodiment of the present utility model;

[0025] Figure 2 Shown is a schematic diagram of the elastic frame structure in an embodiment of the present utility model;

[0026] Figure 3 Shown is another structural schematic diagram of a relay provided by an embodiment of the present utility model;

[0027] Figure 4 Shown is Figure 3 Front view of the relay shown;

[0028] Figure 5 Shown is Figure 4 A cross-sectional view along line AA;

[0029] Figure 6 FIG. 1 shows a third structural diagram of a relay provided by an embodiment of the present utility model;

[0030] Figure 7 Shown is another schematic diagram of the elastic frame structure in an embodiment of the present utility model;

[0031] Figure 8 Shown is Figure 7 The schematic diagram of the structure of the elastic frame structure and the permanent magnet shown;

[0032] Figure 9 Shown is a cross-sectional view of a relay provided by an embodiment of the present utility model (protective structure is not shown);

[0033] Figure 10 Shown is another structural schematic diagram of the protective structure in an embodiment of the present utility model.

[0034] The following are the descriptions of the reference numerals:

[0035] 10-insulating cover; 11-first side wall; 12-second side wall; 13-top plate; 20-static contact; 31-first sub-shell; 32-second sub-shell; 40-yoke iron plate; 50-frame piece; 60-coil frame; 70-moving contact piece; 100-elastic frame structure; 101-first side portion; 102-second side portion; 103-sub-frame; 104-third side portion; 105-reinforcement rib; 110-top protective portion; 210-permanent magnet; 211-positioning protrusion. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0037] See also Figures 1 to 10 As shown, this embodiment provides a relay, including a contact structure, an insulating cover 10 and a protective structure, the contact structure including a plurality of static contacts 20 and a moving contact piece 70, one end of the plurality of static contacts 20 and the moving contact piece 70 are both accommodated in the insulating cover 10, and both ends of the moving contact piece can contact or disconnect with the static contacts; the protective structure is located outside the insulating cover, at least part of the protective structure is arranged on the circumferential side wall of the insulating cover 10, at least part of the protective structure can undergo elastic deformation and abut against the circumferential side wall of the insulating cover 10 to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover 10.

[0038] The relay provided in this embodiment can apply pre-pressure toward the inner cavity of the insulating cover to the insulating cover because at least part of the protective structure can undergo elastic deformation and abut against the circumferential side wall of the insulating cover. This pre-pressure can offset a part of the outward impact force, which is beneficial to improving safety performance. At the same time, it limits the insulating cover from expanding outward, effectively protecting the insulating cover, especially the relatively weak circumferential side wall of the insulating cover, enhancing the structural strength of the insulating cover, and improving safety performance.

[0039] It should be understood that, in order to apply pre-pressure to the insulation cover toward the inner cavity of the insulation cover 10 , the protective structure in this embodiment is located outside the insulation cover.

[0040] For example, the material of the insulating cover 10 in this embodiment is ceramic. Of course, the material of the insulating cover is not limited to ceramic, and can also be plastic. The cross-section of the insulating cover 10 is generally rectangular, for example, the cross-section of the insulating cover 10 can be a rounded rectangle, and the insulating cover 10 has a length direction (in Figure 3 Indicated by the arrow direction D1 in the figure), width direction (indicated by Figure 3 The arrow direction D2 in the figure) and the height direction (indicated by Figure 3 The insulating cover 10 includes a top plate 13 and a circumferential side wall arranged around the edge of the top plate 13. The circumferential side wall includes two first side walls 11 and two second side walls 12. The two first side walls 11 are arranged opposite to each other along the width direction of the insulating cover 10, and the two second side walls 12 are arranged opposite to each other along the length direction of the insulating cover 10.

[0041] Exemplarily, there are two static contacts 20. The top plate 13 of the insulating cover 10 is provided with two mounting holes, spaced apart along the length of the insulating cover 10. Each mounting hole is provided with a static contact 20, one of which serves as a terminal for current inflow, and the other as a terminal for current outflow. One end of the movable contact 70 contacts or disconnects with one of the static contacts 20, while the other end of the movable contact 70 contacts or disconnects with the other static contact 20. Of course, the number of static contacts can also be greater than two, with some of the static contacts contacting or disconnecting with one end of the movable contact, while the other portion of the static contacts contacts or disconnects with the other end of the movable contact.

[0042] It should be understood that in Figure 1 From the perspective of FIG, the top plate 13 of the insulating cover 10 is located above the circumferential side wall. From other perspectives, the top plate may also be located below or on one side of the circumferential side wall.

[0043] In this embodiment, Figure 9 The moving contact piece 70 is shown as an example. Figure 9 The moving contact piece 70 and the static contact are in the disconnected state.

[0044] In one embodiment, see Figure 1 As shown, the relay further includes a yoke plate 40 and a frame plate 50. The yoke plate 40 is connected to the end of the insulating cover 10 away from the top plate 13 through the frame plate 50. The relay further includes a coil frame 60, which is located on the side of the yoke plate 40 away from the protective structure and has a coil wound thereon.

[0045] Exemplarily, the yoke plate 40 is connected to the end of the insulating cover 10 away from the top plate 13 through a frame plate 50 to enclose a first inner cavity; a metal shell is connected to the side of the yoke plate 40 away from the insulating cover 10 to form a second inner cavity; the yoke plate 40 is provided with a through hole for connecting the first inner cavity and the second inner cavity; the relay also includes a static iron core, a moving iron core and a push rod, and the static iron core is fixedly arranged in the second inner cavity; the moving iron core is located in the second inner cavity, the moving contact piece is located in the first inner cavity, and the push rod is passed through the through hole, one end of the push rod is connected to the moving iron core, and the other end of the push rod is connected to the moving contact piece; the moving iron core can be attracted or separated from the static iron core, so that the moving contact on the moving contact piece contacts or disconnects with the static contact on the static contact head.

[0046] In one embodiment, the protective structure includes an elastic frame structure 100 , which is disposed around the circumferential side wall of the insulating cover 10 .

[0047] It should be noted that, see Figure 10 As shown, the protective structure may further include a top protective portion 110 . The top protective portion 110 is disposed on the top plate of the insulating cover. The top protective portion 110 may be integrally formed with the elastic frame structure 100 .

[0048] During the assembly process of the relay, the elastic frame structure 100 undergoes elastic deformation and contacts a portion of the circumferential side wall of the insulating cover 10, thereby applying a pre-pressure toward the inner cavity of the insulating cover 10. This pre-pressure can offset a portion of the outward impact force, which is beneficial to improving safety performance and at the same time limits the insulating cover 10 from expanding outward.

[0049] In one embodiment, the elastic frame structure has at least one side group, and the at least one side group includes two opposite side portions, and the two side portions are respectively located on both sides of the insulation cover to apply pre-pressure to the insulation cover toward the inner cavity of the insulation cover.

[0050] In some embodiments, the number of side groups is two, the two side groups are respectively a first side group and a second side group, the first side group includes two opposite first side portions 101, the second side group includes two opposite second side portions 102, and the two first side portions 101 and the two second side portions 102 are both capable of undergoing elastic deformation to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

[0051] For example, see Figure 1 As shown, the two first side portions 101 are respectively arranged on the outside of the first side wall 11 to apply pre-pressure to the first side wall 11 toward the inner cavity of the insulation cover 10. The two second side portions 102 are respectively arranged on the outside of the second side wall 12 to apply pre-pressure to the second side wall 12 toward the inner cavity of the insulation cover 10.

[0052] In some embodiments, see Figure 2 As shown, the elastic frame structure 100 extends from one end of the insulating cover 10 to the other along the height direction of the insulating cover 10. This increases the contact area between the elastic frame structure 100 and the circumferential sidewalls of the insulating cover 10, thereby more effectively protecting the insulating cover 10 and further improving safety. It should be understood that the contact between the elastic frame structure 100 and the circumferential sidewalls of the insulating cover 10 is indirect.

[0053] In this embodiment, the height of the elastic frame structure 100 is consistent with the height of the insulating cover 10. The height of the elastic frame structure 100 is no greater than the height of the insulating cover 10, thereby not increasing the height dimension of the relay. For example, the height of the elastic frame structure 100 is substantially equal to the height of the insulating cover 10.

[0054] For example, see Figure 5 As shown, the middle position of the first side portion 101 undergoes elastic deformation toward the inner cavity of the insulating cover, so that the middle position of the first side portion 101 abuts against the first side wall 11 of the insulating cover 10, and a gap is set between the two ends of the first side portion 101 and the first side wall 11.

[0055] Accordingly, the middle position of the second side portion 102 undergoes elastic deformation in the direction close to the inner cavity of the insulating cover 10, so that the middle position of the second side portion 102 abuts against the second side wall 12 of the insulating cover 10, and along the length direction of the insulating cover 10, gaps are set between the two ends of the second side portion 102 and the second side wall 12. Figure 5 The direction of the arrow in the figure indicates the direction of the preload.

[0056] For example, see Figure 1 As shown, the elastic frame structure 100 can be an integrally molded structure having a circumferentially closed protective space, and the insulating cover 10 is located in the protective space. When the huge pressure borne by the insulating cover 10 is transmitted to the protective structure, the integral elastic frame structure 100 can apply a more uniform and stable pre-pressure to the inner cavity of the insulating cover 10 from all sides, effectively protecting the insulating cover 10 and improving safety performance.

[0057] Of course, see Figure 2 As shown, the elastic frame structure 100 can also be formed by bending a bendable plate-like structure. Specifically, the two ends of the plate-like structure can be bent to form folded edges, and the folded edges at both ends are hooked together. The folded edges can also be welded to further increase the structural strength.

[0058] In other embodiments, see Figure 3 and Figure 6 As shown, the elastic frame structure 100 includes multiple sub-frames 103, which are spaced apart along the height direction of the insulating cover 10. This approach can reduce the material consumption of the elastic frame structure 100, thereby reducing the overall weight of the relay and lowering production costs. In addition, the sub-frames are smaller in size, easier to form, and have more precise dimensional control.

[0059] For example, see Figure 3 As shown, the sub-frame 103 can be made of metal strips, see Figure 6 As shown, the sub-frame 103 can also be made of elastic metal wire. The sub-frame 103 can be an integrally formed structure, or a frame structure formed by fixing the head and tail together. For example, see Figures 3 to 5 As shown, both ends of the metal strip are bent to form a folded edge, and the folded edges at both ends are hooked together to form a sub-frame 103. Figure 6 As shown, both ends of the elastic metal wire are bent to form a hook-shaped structure, and the hook-shaped portions at both ends are hooked together to form the sub-frame 103 .

[0060] The spacing between the multiple sub-frames 103 can be selected according to actual production and processing needs. The multiple sub-frames 103 can all be made of elastic metal wires, or all be made of metal strips, or some sub-frames 103 can be made of elastic metal wires and other sub-frames 103 can be made of metal strips.

[0061] In this embodiment, the elastic frame structure is made of metal.

[0062] In other embodiments, the elastic frame structure may also be made of non-metallic material, such as plastic that can undergo elastic deformation.

[0063] It should be noted that the number of the elastic frame structure 100 can be one or more, and the multiple elastic frame structures 100 are arranged in sequence, that is, multiple elastic frame structures 100 are arranged along the inner cavity of the insulating cover 10 toward the outside.

[0064] In some embodiments, see Figure 7 As shown, there are two side groups, namely a first side group and a third side group. The first side group includes two opposing first side portions 101, and the third side group includes two opposing third side portions 104. Both first side portions 101 are elastically deformable to apply pre-compression to the insulation cover toward the inner cavity of the insulation cover. The two third side portions 104 are in contact with the insulation cover. The third side portions 104 can be a rigid structure.

[0065] The two first side portions 101 are respectively arranged on the outside of the first side wall 11 to apply pre-pressure to the first side wall 11 toward the inner cavity of the insulating cover 10; at the same time, the two third side portions 104 are respectively arranged on the outside of the second side wall 12 to enhance the structural strength of the second side wall 12, thereby enhancing the overall safety performance.

[0066] For example, the third side portion 104 is integrally formed with the first side portion 101. Figure 8 As shown, a corner is formed between the first side portion 101 and the third side portion 104, and a reinforcing rib 105 is provided at the corner to increase the strength of the elastic frame structure 100. Exemplarily, the reinforcing rib 105 is formed by inward stamping to increase the structural strength of the corner.

[0067] The material of the third side portion 104 is a magnetic conductive material. Figure 8 As shown, the relay further includes a permanent magnet 210, which is located between the third side portion 104 and the circumferential side wall of the insulating cover 10. The two third side portions 104 are in contact with the second side wall of the insulating cover through the permanent magnet 210.

[0068] Exemplarily, there are two permanent magnets 210, and the two permanent magnets 310 are arranged on opposite sides of the insulating cover 10 along the length direction of the insulating cover 10 to form an arc-blowing magnetic field to achieve the arc extinguishing function. The two permanent magnets 210 are respectively located between the third side portion 104 and the second side wall 12 of the insulating cover 10.

[0069] In one embodiment, both third side portions 104 are provided with positioning protrusions 211 , and the positioning protrusions 211 are used to position the permanent magnets 210 .

[0070] The positioning protrusion 211 can be formed by stamping the elastic frame structure.

[0071] In one embodiment, the relay further comprises a housing, and the insulating cover and the protective structure are both installed inside the housing. In this case, the housing can play a further protective role.

[0072] For example, see Figure 1 As shown, the housing includes a first sub-shell 31 and a second sub-shell 32 , and the first sub-shell 31 and the second sub-shell 32 are fixedly connected to encapsulate the insulating cover 10 and the protective structure in the housing.

[0073] 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.

[0074] In the embodiments of the utility model, 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 expressly defined. Terms such as "installed", "connected", "connected", "fixed", and "contacted" 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; "contacted" can be a direct contact or an indirect contact. For those skilled in the art, the specific meanings of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0075] In the description of the utility model embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model embodiments 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 direction. Therefore, it cannot be understood as a limitation on the utility model embodiments.

[0076] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] The above are merely preferred embodiments of the utility model and are not intended to limit the utility model. Those skilled in the art will readily appreciate that various modifications and variations of the utility model embodiments are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the utility model embodiments shall be included within the scope of protection of the utility model embodiments.

Claims

1. A relay, characterized in that: The invention comprises a contact structure, an insulating cover and a protective structure, wherein the contact structure comprises a plurality of stationary contacts and a movable contact piece, one end of each of the stationary contacts and the movable contact piece are accommodated in the insulating cover, and both ends of the movable contact piece can be in contact with or disconnected from the stationary contacts; The protective structure is located outside the insulating cover, and at least a portion of the protective structure is arranged on the circumferential side wall of the insulating cover. At least a portion of the protective structure can undergo elastic deformation and abut against the circumferential side wall of the insulating cover to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

2. The relay according to claim 1, wherein: The protective structure includes an elastic frame structure, which is arranged around the circumferential side wall of the insulating cover; the insulating cover has a height direction, and along the height direction of the insulating cover, the elastic frame structure extends from one end of the insulating cover to the other end; or, the elastic frame structure includes a plurality of sub-frames, and the plurality of sub-frames are arranged at intervals along the height direction of the insulating cover.

3. The relay according to claim 2, characterized in that The elastic frame structure has at least one side group, and at least one side group includes two opposite side portions. The two side portions are respectively located on both sides of the insulating cover to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

4. The relay according to claim 3, characterized in that There are two side groups, and the two side groups are respectively a first side group and a second side group. The first side group includes two opposite first side portions, and the second side group includes two opposite second side portions. The two first side portions and the two second side portions can both undergo elastic deformation to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover.

5. The relay according to claim 3, characterized in that There are two side groups, and the two side groups are respectively a first side group and a third side group. The first side group includes two opposite first side portions, and the third side group includes two opposite third side portions. Both of the first side portions can undergo elastic deformation to apply pre-pressure to the insulating cover toward the inner cavity of the insulating cover; the two third side portions are in contact with the insulating cover.

6. The relay according to claim 5, characterized in that The device further includes a permanent magnet, which is located between the third side portion and the circumferential side wall of the insulating cover. The third side portion is in contact with the circumferential side wall of the insulating cover through the permanent magnet.

7. The relay according to claim 6, characterized in that The third side portion is provided with a positioning protrusion, and the positioning protrusion is used to position the permanent magnet.

8. The relay according to claim 5, characterized in that A reinforcing rib is provided between the first side portion and the third side portion.

9. The relay according to any one of claims 2 to 8, characterized in that: The elastic frame structure is made of metal.

10. The relay according to any one of claims 2 to 8, characterized in that The elastic frame structure is an integrally formed structure, or the elastic frame structure includes a bendable plate-shaped structure having two ends, and the two ends are fixedly connected together to form the elastic frame structure.

11. The relay according to any one of claims 1 to 8, characterized in that: There are multiple protective structures, and the multiple protective structures are sequentially arranged on the circumferential side wall of the insulation cover.

12. The relay according to any one of claims 1 to 8, characterized in that: It also includes a shell, and the insulating cover and the protective structure are both installed inside the shell.

13. The relay according to any one of claims 1 to 8, characterized in that: It also includes a yoke plate and a frame piece; the insulating cover is made of ceramic, and the yoke plate is connected to the insulating cover through the frame piece; the protective structure is located on the yoke plate, or the protective structure is located on the frame piece.

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