Relay housing structure and relay

Abstract

The application relates to a relay shell structure and a relay, which comprises a shell, a shell wall of the shell is provided with a pressure relief hole, the pressure relief hole is used for connecting a shell cavity of the shell with an external environment of the shell, the shell further has a pressure relief body, the pressure relief body is arranged in the pressure relief hole, under normal working conditions, the pressure relief body is in sealed connection with a hole wall of the pressure relief hole, so that the pressure relief body closes the pressure relief hole, under short circuit working conditions, the pressure relief body is at least partially separated from the hole wall of the pressure relief hole, so that the pressure relief body opens the pressure relief hole, so that the pressure relief hole is relieved and an electric arc is directionally released. Not only can the pressure relief hole be relieved, and the problem that the shell is cracked due to excessive pressure is prevented, but also the pressure relief hole can guide the electric arc to be directionally released to the outside of the shell, so that the electric arc is effectively prevented from burning the contact, components and the like, the safety of the relay is ensured, the safety hidden danger is eliminated, and the use reliability of the relay is improved.

Description

Technical Field

[0001] This application relates to the technical field of relays, and in particular to a relay housing structure and a relay. Background Technology

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches a specified requirement. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit) and is widely used in various electronic and electrical equipment.

[0003] In relays using a bridge contact structure, when a short-circuit current passes through the current-carrying component, a strong electrodynamic force is generated in the contact circuit, mainly manifested as the Holm force between the contacts. This causes the contacts to spring apart and generate an electric arc. On the one hand, the electric arc can burn the contacts and surrounding components. On the other hand, the short circuit can also cause the internal air pressure to expand rapidly, resulting in excessive pressure on the outer casing and causing it to crack. This leads to the electric arc overflowing and burning the circuit board and other components, posing a significant safety hazard. Utility Model Content

[0004] Therefore, it is necessary to provide a relay housing structure and a relay to address the problems of arc burning of contacts and components and excessive pressure causing the housing to crack in traditional technologies.

[0005] A first aspect of this application provides a relay housing structure comprising:

[0006] The housing has a pressure relief hole in its shell wall, which is used to connect the shell cavity of the housing with the external environment of the housing;

[0007] The housing also includes a pressure relief body disposed within the pressure relief hole. Under normal operating conditions, the pressure relief body is sealed to the wall of the pressure relief hole, thereby closing the pressure relief hole. Under short-circuit conditions, the pressure relief body is at least partially disconnected from the wall of the pressure relief hole, thereby opening the pressure relief hole to release pressure and guide the directional release of the electric arc.

[0008] The relay housing structure described in this solution is used in relays. Because a pressure relief hole is provided on the housing wall, and a pressure relief body is connected inside the pressure relief hole, when the relay is in normal operation, the pressure relief body maintains a sealed connection with the wall of the pressure relief hole, thus reliably closing the pressure relief hole and ensuring the sealing performance of the relay housing structure. When a short circuit occurs inside the relay, not only will an electric arc be generated inside the housing, but a rapid expansion of air pressure will also occur. At this time, the pressure relief body is forced open under the action of air pressure, and at least partially separates from the wall of the pressure relief hole, allowing the pressure relief body to open the pressure relief hole. In this way, not only can the pressure relief hole be used to relieve pressure, preventing the housing from cracking due to excessive pressure, but the pressure relief hole can also guide the electric arc to be released directionally to the outside of the housing, effectively preventing the electric arc from burning contacts and components, ensuring relay safety, eliminating safety hazards, and improving the reliability of the relay.

[0009] The technical solution of this application will be further described below:

[0010] In one embodiment, the housing includes a top wall, the pressure relief hole is formed on the top wall, and the pressure relief hole is disposed through the wall thickness direction of the top wall.

[0011] In one embodiment, the housing includes a sidewall, the pressure relief hole is formed on the sidewall, and the pressure relief hole is disposed through the wall thickness direction of the sidewall.

[0012] In one embodiment, the housing includes a top wall and a side wall connected to the top wall. The pressure relief hole is provided on both the top wall and the side wall, and the pressure relief hole is arranged through the wall thickness direction of the top wall and the side wall.

[0013] In one embodiment, the housing includes a top wall and a side wall connected to the top wall. At least one of the top wall and the side wall is provided with a plurality of pressure relief holes. The hole spacing between two adjacent pressure relief holes is set as D1, and the hole diameter of the pressure relief hole is set as D2, wherein D1 / D2≥3.

[0014] In one embodiment, the diameter of the pressure relief hole is 0.5mm to 2mm.

[0015] In one embodiment, the pressure relief body includes a main body and a thin-walled portion, the thin-walled portion being connected to the outer periphery of the main body and being detachably connected to the wall of the pressure relief orifice.

[0016] In one embodiment, the thickness of the thin-walled portion is set to H, where H ≤ 0.5 mm.

[0017] In one embodiment, the pressure relief body and the housing are integrally formed.

[0018] In one embodiment, the pressure relief body and / or the housing are made of high-temperature resistant engineering plastic.

[0019] In one embodiment, the pressure relief body includes a pressure relief plate and a first connecting structure connected to the periphery of the pressure relief plate, and the wall of the pressure relief hole is provided with a second connecting structure.

[0020] Under normal operating conditions, the first connecting structure and the second connecting structure are sealed together, causing the pressure relief plate to close the pressure relief hole; under short-circuit operating conditions, the first connecting structure and the second connecting structure are at least partially disconnected, causing the pressure relief plate to open the pressure relief hole.

[0021] In one embodiment, the housing is provided with a clearance portion, and the pressure relief hole is formed in the clearance portion so that the pressure relief hole can guide the directional release of the electric arc;

[0022] Alternatively, the wall of the pressure relief hole may be provided with a guide surface, which is used to guide the directional release of the electric arc passing through the pressure relief hole.

[0023] A second aspect of this application also proposes a relay comprising the relay housing structure described in any of the above embodiments.

[0024] In one embodiment, the relay includes a contact structure disposed within the housing cavity and arranged close to the pressure relief hole. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the relay housing structure according to an embodiment of this application.

[0028] Figure 2 for Figure 1 A structural diagram from another perspective.

[0029] Figure 3 This is a side view of the relay housing structure.

[0030] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at point AA.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Relay housing structure; 10. Housing; 11. Pressure relief hole; 12. Top wall; 13. Side wall; 20. Pressure relief body; 21. Main body; 22. Thin-walled part. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] See Figure 1 This application illustrates a relay housing structure 100 as an embodiment of the present application. As the main component of the relay, it houses and integrates functional components such as moving contacts, stationary contacts, and electromagnetic modules, while also providing protection for these components. The moving contact has a moving point, and the stationary contact has a stationary contact; the moving and stationary contacts cooperate to form a contact structure.

[0040] For example, the relay housing structure 100 includes a housing 10, and the housing wall of the housing 10 is provided with a pressure relief hole 11, which is used to connect the housing cavity of the housing 10 with the external environment of the housing 10.

[0041] The shell 10 can be any regular shape such as a cuboid or a cylinder; of course, the shell 10 can also adopt an irregular structural design, and the specific choice can be made flexibly according to actual needs.

[0042] For example, in this application, the housing 10 adopts a cuboid structure design, which makes the structure of the relay housing 100 simple and regular. It can form a sufficient and regular cavity inside to accommodate the installation of functional components, and at the same time facilitates the installation of the relay and reduces the installation space occupied.

[0043] Please continue reading. Figures 1 to 4 In addition, the housing 10 in this application also has a pressure relief body 20, which is disposed in the pressure relief hole 11.

[0044] Understandably, the size and shape of the pressure relief body 20 correspond one-to-one with the size and shape of the pressure relief hole 11. For example, when the pressure relief hole 11 is a circular hole, the corresponding pressure relief body 20 is a circular component; or when the pressure relief hole 11 is a triangular hole, the corresponding pressure relief body 20 is a triangular component, and so on. The specific choice can be made flexibly according to actual needs.

[0045] When the relay is in normal operating condition, the pressure relief body 20 is sealed to the wall of the pressure relief hole 11, so that the pressure relief body closes the pressure relief hole 11. When the relay is in short-circuit condition, that is, when the functional components installed inside the housing 10 are short-circuited, the pressure relief body is at least partially disconnected from the wall of the pressure relief hole 11, so that the pressure relief body opens the pressure relief hole 11 to relieve pressure and guide the arc to be released in a directional manner.

[0046] In summary, implementing the technical solution of this embodiment will achieve the following beneficial effects: The relay housing structure 100 of this solution is applied in a relay. Since a pressure relief hole 11 is provided on the shell wall of the housing 10, and a pressure relief body 20 is connected inside the pressure relief hole 11, when the relay is in normal operating condition, the pressure relief body 20 maintains a sealed connection with the hole wall of the pressure relief hole 11, thereby reliably closing the pressure relief hole 11 and ensuring the sealing performance of the relay housing structure 100. Furthermore, when a short circuit occurs inside the relay, not only will an electric arc be generated inside the housing 10, but also... A rapid expansion of air pressure will occur. At this time, the pressure relief body 20 will be forced open by the air pressure, and at least part of the pressure relief body 20 will be separated from the wall of the pressure relief hole 11, so that the pressure relief body 20 can open the pressure relief hole 11. In this way, not only can the pressure relief hole 11 be used to relieve pressure and prevent the housing 10 from cracking due to excessive pressure, but the pressure relief hole 11 can also guide the electric arc to be released directionally to the outside of the housing 10, thereby effectively preventing the electric arc from burning the contact structure, components, etc., ensuring the safety of the relay, eliminating safety hazards, and improving the reliability of the relay.

[0047] Please continue reading. Figure 1 , Figure 2 and Figure 4Based on the above embodiments, in one embodiment the housing 10 includes a top wall 12, a pressure relief hole 11 is formed on the top wall 12, and the pressure relief hole 11 is arranged through the wall thickness direction of the top wall 12.

[0048] Alternatively, as an alternative to the above embodiments, in another embodiment, the housing 10 includes a sidewall 13, a pressure relief hole 11 is formed on the sidewall 13, and the pressure relief hole 11 is disposed through the wall thickness direction of the sidewall 13.

[0049] Alternatively, as an alternative to the two embodiments described above, in another embodiment, the housing 10 includes a top wall 12 and a side wall 13 connected to the top wall 12. Both the top wall 12 and the side wall 13 are provided with pressure relief holes 11, and the pressure relief holes 11 are arranged through the wall thickness direction of the top wall 12 and the side wall 13.

[0050] Depending on the different models of the relay and / or the different layout structures of the functional components inside the housing 10, the pressure relief hole 11 can be flexibly selected to be formed on the top wall 12 and / or side wall 13 of the housing 10, so that the pressure relief hole 11 can be as close as possible to the short circuit location, while avoiding sensitive components. This allows the generated arc to enter the pressure relief hole 11 with a shorter distance and then be guided and released to the outside of the housing 10 through the pressure relief hole 11, thereby better controlling the arc escape and preventing the arc from burning the contact structure, circuit board and components.

[0051] This application shows a schematic diagram of the relay housing structure in which the pressure relief hole 11 is provided on the top wall 12.

[0052] The housing 10 has a contact structure installed inside its cavity, which is located near the pressure relief hole 11. This allows the generated electric arc to be quickly and effectively released to the outside of the housing 10 through the pressure relief hole 11 when the contact structure experiences an abnormal operating condition such as a short circuit.

[0053] Please continue reading. Figure 2 Furthermore, based on any of the above embodiments, the housing 10 includes a top wall 12 and a side wall 13 connected to the top wall 12. At least one of the top wall 12 and the side wall 13 is provided with a plurality of pressure relief holes 11. The hole spacing between two adjacent pressure relief holes 11 is set as D1, and the hole diameter of the pressure relief hole 11 is set as D2, wherein D1 / D2≥3.

[0054] Generally speaking, when a short circuit occurs inside the relay, the larger the short circuit current, the stronger the electric arc generated, and the more intense and rapid the gas pressure expansion. At this time, by reasonably setting multiple pressure relief holes 11, multiple pressure relief holes 11 can be used simultaneously for pressure relief and guiding the release of the electric arc, thereby better protecting the structural safety of the housing 10 and preventing the contact structure, circuit board and components from being burned and damaged by the electric arc.

[0055] However, it should be noted that when multiple pressure relief holes 11 are provided on the top wall 12 and / or side wall 13 at the same time, the hole spacing D1 between two adjacent pressure relief holes 11 must be greater than or equal to three times the hole diameter D2 of the pressure relief hole 11. The purpose is to ensure that the shell wall of the shell 10 between two adjacent pressure relief holes 11 has sufficient extension area and structural strength, so as to avoid insufficient strength leading to being torn apart by rapidly expanding gas pressure, causing structural damage to the shell 10 to explode.

[0056] For example, the distance between two adjacent pressure relief holes 11 can be understood as the straight-line distance between the centers of the two adjacent pressure relief holes 11.

[0057] Optionally, in one embodiment, the diameter of the pressure relief hole 11 is 0.5mm to 2mm. For example, the diameter of the pressure relief hole 11 can be 0.5mm, 0.8mm, 1.1mm, 1.4mm, 1.7mm, 2mm, etc., and can be flexibly selected according to actual needs. No specific limitation is made here.

[0058] In this way, while ensuring the structural strength of the housing 10, the aperture of the pressure relief hole 11 can be reasonably set according to the area of ​​the top wall 12 and / or side wall 13 of the housing 10, so that the opening size of the pressure relief hole 11 can meet the needs of rapid pressure relief and guiding the release of electric arc.

[0059] Please continue reading. Figure 2 and Figure 4 In one optional embodiment of this application, the pressure relief body 20 includes a main body 21 and a thin-walled part 22. The thin-walled part 22 is connected to the outer periphery of the main body 21 and is detachably connected to the wall of the pressure relief hole 11.

[0060] The thin-walled portion 22 and the main body 21 are integrally structured. Compared to the main body 21, the thin-walled portion 22 has a reduced thickness, meaning its thickness is less than that of the main body 21. In this way, under normal operating conditions, the main body 21 can be sealed to the housing 10 via the thin-walled portion 22, allowing the pressure relief body 20 to close the pressure relief hole 11. Simultaneously, when a short circuit occurs in the relay, the thin-walled portion 22 can quickly break under internal air pressure, disconnecting the pressure relief body 20 from the pressure relief hole 11. The pressure relief body 20 is then forced open, opening the pressure relief hole 11, facilitating pressure relief and arc release.

[0061] Please continue reading. Figure 4 To ensure that the thin-walled portion 22 can break quickly and reliably under air pressure, thereby allowing the pressure relief body 20 to be forced open and the pressure relief hole 11 to open, in one embodiment, the thickness of the thin-walled portion 22 is set to H, where H ≤ 0.5 mm. This avoids the thin-walled portion 22 being too thick, resulting in excessive strength that would prevent it from being effectively broken by air pressure.

[0062] It should be noted that the fracture of the thin-walled portion 22 due to air pressure can refer to the fracture at the connection between the thin-walled portion 22 and the wall of the pressure relief hole 11; and / or, the fracture at the connection between the thin-walled portion 22 and the main body portion 21; and / or, the fracture of the thin-walled portion 22 itself, which is not specifically limited here.

[0063] Optionally, in this application, the pressure relief body 20 and the housing 10 are integrally formed. This allows the housing 10 and the pressure relief body 20 to achieve better structural integrity, while also facilitating the processing and forming of the relay housing structure 100 and reducing installation steps.

[0064] Please continue reading. Figure 2 and Figure 4 For example, the thin-walled portion 22 of the pressure relief body 20 has an annular structure, which can be formed by stamping, milling and other processing methods during the processing of the housing 10.

[0065] Furthermore, in one embodiment, the pressure relief body 20 and / or the housing 10 are made of high-temperature resistant engineering plastic. In this way, the pressure relief body 20 and the housing 10 achieve sufficient structural strength and high-temperature resistance to prevent arc burns and deformation or even explosion under air pressure, while simultaneously reducing the overall weight of the relay housing structure 100, which is beneficial for achieving a lightweight relay design. In addition, the structural strength of the plastic is not excessive, allowing the thin-walled portion 22 to fracture under air pressure.

[0066] For example, high-temperature resistant engineering plastics can be, but are not limited to, polyphenylene sulfide, high-temperature nylon, etc.

[0067] In order to enable the pressure relief hole 11 to guide the directional release of the electric arc, in an optional embodiment, the housing 10 is provided with a clearance portion, and the pressure relief hole 11 is formed in the clearance portion so that the pressure relief hole 11 can guide the directional release of the electric arc.

[0068] When a relay is in use, it is generally installed inside a device that contains circuit boards, various components, control units, energy storage units, etc. The clearance area can be understood as the portion of the housing 10 that is offset from the positions of the circuit boards, components, control units, energy storage units, etc. This ensures that when the electric arc generated inside the relay is released through the pressure relief hole 11, it will not erupt onto the circuit boards, components, control units, energy storage units, etc., thus guiding the arc's release in a directional manner and preventing the arc from burning or damaging these components.

[0069] Alternatively, in another optional embodiment, the wall of the pressure relief hole 11 is provided with a guiding surface, which is used to guide the directional release of the electric arc passing through the pressure relief hole 11. The difference from the above embodiment is that a guiding surface is machined on the wall of the pressure relief hole 11, and the directional release of the electric arc is achieved through the guiding effect of the guiding surface. For example, the guiding surface can be a beveled structure, etc.

[0070] As described above, the pressure relief body 20 can adopt a structure of main body 21 and thin wall part 22, and is an integral structure with the shell 10. When the pressure relief body 20 is punched open and the pressure relief hole 11 is opened, the thin wall part 22 breaks and separates from the shell 10. This structural separation is irreversible, that is to say, the pressure relief body 20 can only be used once and is not reusable.

[0071] In response to the aforementioned shortcomings, in one embodiment, the pressure relief body 20 includes a pressure relief plate and a first connecting structure connected to the periphery of the pressure relief plate, and the wall of the pressure relief hole 11 is provided with a second connecting structure.

[0072] Under normal operating conditions, the first connecting structure and the second connecting structure are sealed together, causing the pressure relief plate to close the pressure relief hole 11; under short-circuit operating conditions, the first connecting structure and the second connecting structure are at least partially disconnected, causing the pressure relief plate to open the pressure relief hole 11.

[0073] That is, by designing the first connection structure and the second connection structure to be detachably connected, the reusability of the pressure relief body 20 can be realized. That is, when the pressure relief body 20 is blown open by air pressure and separated from the housing 10, and the relay returns to normal, the pressure relief body 20 can be reinstalled into the pressure relief hole 11 by reconnecting the first connection structure and the second connection structure, and the pressure relief hole 11 can be closed, so that the relay housing structure 100 has the function of repeated use, reducing material loss and cost, and improving economy.

[0074] For example, the first connection structure and the second connection structure can be any one of the following: snap-fit ​​connection structure, adhesive structure, magnetic connection structure, etc. The specific choice can be made flexibly according to actual needs, and no specific limitation is made here.

[0075] In addition to the above, this application also proposes a relay that includes the relay housing structure 100 as described in any of the above embodiments. For example, the relay may be, but is not limited to, a relay with a bridge contact structure.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A relay housing structure, characterized in that, include: The housing has a pressure relief hole in its shell wall, which is used to connect the shell cavity of the housing with the external environment of the housing; The housing also includes a pressure relief body disposed within the pressure relief hole. Under normal operating conditions, the pressure relief body is sealed to the wall of the pressure relief hole, thereby closing the pressure relief hole. Under short-circuit conditions, the pressure relief body is at least partially disconnected from the wall of the pressure relief hole, thereby opening the pressure relief hole to release pressure and guide the directional release of the electric arc.

2. The relay housing structure according to claim 1, characterized in that, The housing includes a top wall, and the pressure relief hole is formed on the top wall and is disposed through the wall thickness direction of the top wall.

3. The relay housing structure according to claim 1, characterized by The housing includes a sidewall, and the pressure relief hole is formed on the sidewall and is disposed through the wall thickness direction of the sidewall.

4. The relay housing structure according to claim 1, characterized by The housing includes a top wall and a side wall connected to the top wall. The pressure relief hole is provided on both the top wall and the side wall, and the pressure relief hole is arranged through the wall thickness direction of the top wall and the side wall.

5. The relay housing structure according to claim 1, characterized by The housing includes a top wall and a side wall connected to the top wall. At least one of the top wall and the side wall is provided with a plurality of pressure relief holes. The hole spacing between two adjacent pressure relief holes is set as D1, and the hole diameter of the pressure relief hole is set as D2, wherein D1 / D2≥3.

6. The relay housing structure according to any one of claims 1 to 5, characterized in that, The diameter of the pressure relief hole is 0.5mm to 2mm.

7. The relay housing structure according to claim 1, characterized in that, The pressure relief body includes a main body and a thin-walled part. The thin-walled part is connected to the outer periphery of the main body and is detachably connected to the wall of the pressure relief hole.

8. The relay housing structure according to claim 7, characterized by The thickness of the thin-walled portion is set as H, where H ≤ 0.5 mm.

9. The relay housing structure according to claim 1, characterized in that, The pressure relief body and the shell are integrally formed.

10. The relay housing structure according to claim 1, characterized in that, The pressure relief body and / or the housing are made of high-temperature resistant engineering plastic.

11. The relay housing structure according to claim 1, characterized in that, The pressure relief body includes a pressure relief plate and a first connecting structure connected to the periphery of the pressure relief plate, and the wall of the pressure relief hole is provided with a second connecting structure. Under normal operating conditions, the first connecting structure and the second connecting structure are sealed together, causing the pressure relief plate to close the pressure relief hole; under short-circuit operating conditions, the first connecting structure and the second connecting structure are at least partially disconnected, causing the pressure relief plate to open the pressure relief hole.

12. The relay housing structure according to claim 1, characterized by The housing is provided with a clearance portion, and the pressure relief hole is formed in the clearance portion so that the pressure relief hole can guide the directional release of the electric arc; Alternatively, the wall of the pressure relief hole may be provided with a guide surface, which is used to guide the directional release of the electric arc passing through the pressure relief hole.

13. A relay characterized by comprising: Includes the relay housing structure as described in any one of claims 1 to 12.

14. The relay according to claim 13, characterized in that, The relay includes a contact structure disposed within the cavity of the housing and arranged close to the pressure relief hole.

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