Housing and relay

Abstract

A housing and a relay. The housing is provided with a cavity, and the housing is further provided with a gas outlet hole running therethrough; and a blocking member is further provided in the housing, the blocking member blocks at least part of the gas outlet hole, and a gas outlet channel in communication with both the gas outlet hole and the cavity is formed between the blocking member and the inner wall surface of the housing.

Description

Housing and relay

[0001] Cross-referencing

[0002] This disclosure claims priority to Chinese Patent Application No. 202520562294.0, filed on March 27, 2025, entitled “Casing and Relay”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of electrical control device technology, and more specifically, to a housing and a relay. Background Technology

[0004] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0005] A relay includes a housing and a contact cavity disposed within the housing. During use, a large amount of high-pressure gas may be generated inside the contact cavity. After the high-pressure gas enters the internal space of the housing, it may impact the housing and cause it to crack.

[0006] Utility Model Content

[0007] This application provides a housing and a relay to improve the problem of housings being prone to cracking in related technologies.

[0008] According to a first aspect of the present disclosure, a housing for a relay is provided, the housing having a cavity and a through vent; a shielding member is also provided inside the housing, the shielding member shielding at least a portion of the vent and forming a venting channel communicating with both the vent and the cavity between the shielding member and the inner wall surface of the housing.

[0009] According to some embodiments of this disclosure, the outer casing includes a first casing and a second casing connected to form the cavity, and at least one of the first casing and the second casing has the vent.

[0010] According to some embodiments of this disclosure, the shielding member is separately connected to the outer shell, or the shielding member is integrally connected to the outer shell.

[0011] According to some embodiments of this disclosure, the outer casing has a bottom wall and a cylindrical side wall, the cylindrical side wall is connected to the bottom wall, the cylindrical side wall has the air outlet, the shielding member is connected to the bottom wall, and the shielding member and the cylindrical side wall form the air outlet channel.

[0012] According to some embodiments of the present disclosure, the cylindrical sidewall includes two first sidewalls and two second sidewalls connected to the bottom wall. The two first sidewalls are arranged in parallel, the two second sidewalls are arranged in parallel, and the two first sidewalls and the two second sidewalls are alternately connected end to end to form a ring structure.

[0013] The first sidewall has the air outlet located near the second sidewall.

[0014] According to some embodiments of this disclosure, the shielding member has a first end and a second end, the distance between the first end and the housing is greater than the distance between the second end and the housing, so that the opening size of one end of the air outlet channel is greater than the opening size of the other end.

[0015] According to a second aspect of the present disclosure, a relay is provided, the relay including the housing described in any of the preceding claims. According to some embodiments of the present disclosure, the relay further includes:

[0016] A contact cavity is disposed within the cavity, the contact cavity having a through pressure relief hole communicating with the cavity; and

[0017] An exhaust structure is provided on the contact cavity and configured to open the pressure relief port.

[0018] According to some embodiments of this disclosure, the exhaust structure includes a valve plate disposed on the contact cavity and configured to rupture and open the pressure relief port when the gas pressure in the contact cavity is greater than or equal to a threshold.

[0019] According to some embodiments of this disclosure, the structural strength of the valve plate is less than the structural strength of the contact cavity.

[0020] According to some embodiments of this disclosure, the valve plate and the contact cavity are made of different materials; and / or, the thickness of the valve plate is different from the thickness of the shell wall of the contact cavity.

[0021] According to some embodiments of this disclosure, the valve plate covers the pressure relief hole.

[0022] According to some embodiments of this disclosure, the relay further includes a moving contact and a stationary contact, the moving contact and the stationary contact being located within the contact cavity, the stationary contact being fixedly disposed relative to the contact cavity, and the moving contact being used to contact or separate from the stationary contact.

[0023] According to some embodiments of this disclosure, the contact cavity includes an insulating cover and a yoke plate. The insulating cover is disposed on one side surface of the yoke plate in the thickness direction. The insulating cover and / or the yoke plate have the pressure relief hole, which communicates with the internal space of the insulating cover.

[0024] According to some embodiments of this disclosure, the valve plate is also configured to seal the pressure relief orifice when the gas pressure in the contact cavity is less than the threshold.

[0025] According to some embodiments of this disclosure, the valve plate has a bursting portion and a connecting portion, the connecting portion being connected around the outer periphery of the bursting portion and connected to the contact cavity, the structural strength of the bursting portion being less than the structural strength of the connecting portion; the bursting portion is configured to rupture to open the pressure relief hole when the gas pressure in the contact cavity is greater than or equal to a threshold.

[0026] According to some embodiments of this disclosure, the thickness of the blasting portion is less than the thickness of the connecting portion.

[0027] According to some embodiments of this disclosure, the exhaust structure includes a plurality of stacked valve plates;

[0028] In two adjacent valve plates, the two adjacent connecting portions are connected, and the two adjacent bursting portions are arranged at intervals along the thickness direction of the valve plate.

[0029] According to some embodiments of this disclosure, the contact cavity has a plurality of pressure relief holes, and the relay includes a plurality of venting structures, the positions of the plurality of venting structures corresponding to the positions of the plurality of pressure relief holes, for sealing the plurality of pressure relief holes.

[0030] According to some embodiments of this disclosure, the thickness of the burst portion of the valve plate in the plurality of exhaust structures is not equal.

[0031] An embodiment of the above application has at least the following advantages or beneficial effects:

[0032] The housing of this disclosure includes a shielding member inside the housing that blocks the vent, and the shielding member and the housing wall form a venting channel that communicates with both the vent and the cavity. When gas is generated inside the housing, the gas first impacts the shielding member and then flows through the venting channel to the vent. This design prevents gas pressure from directly acting on the area around the vent, thereby reducing the risk of cracking in the structure around the vent. Furthermore, since the shielding member blocks at least a portion of the vent, the internal structure of the housing cannot be directly seen when viewed from the outside through the vent, improving aesthetics.

[0033] Furthermore, the connecting part surrounds and connects to the outer periphery of the blasting part, and the structural strength of the connecting part is greater than that of the blasting part. On the one hand, the structural strength of the blasting part is lower, so it can be quickly broken by the gas in the contact cavity and the gas can be released in time. On the other hand, the structural strength of the connecting part is higher, so when the connecting part is connected to the contact cavity, the stress resistance of the connecting part is improved, thereby avoiding the rupture of the blasting part due to the transmission of welding stress to the blasting part.

[0034] Furthermore, multiple valve plates are stacked and adjacent bursting sections are arranged at intervals. On the one hand, when the relay is in an abnormal working state, multiple bursting sections will burst and release pressure in sequence; on the other hand, when the relay is in a normal working state, the probability of multiple bursting sections bursting simultaneously is much lower than the probability of only one bursting section bursting. Therefore, the design of multiple bursting sections improves the sealing reliability of the contact cavity under normal working state.

[0035] Furthermore, the contact cavity has multiple pressure relief holes, which increases the discharge capacity to quickly expel high-pressure gas. In addition, with multiple pressure relief holes, the area of ​​each hole can be set smaller while maintaining the overall discharge capacity, thus allowing for more flexible placement of each hole. For example, some pressure relief holes can be located in the insulating cover, while others can be located in the yoke plate, etc.

[0036] Furthermore, the thickness of the rupture sections in the multiple exhaust structures is not equal, so that the thinner rupture section breaks first and the thicker rupture section breaks later. This allows the high-pressure gas to be released sequentially and orderly into the cavity enclosed by the outer shell, avoiding the problem of the outer shell cracking due to multiple pressure relief holes releasing gas into the outer shell in a concentrated manner and the outer shell being unable to release the gas in time. Attached Figure Description

[0037] Figure 1 is a perspective view of a relay according to an embodiment of the present disclosure.

[0038] Figure 2 is a perspective view of a relay according to an embodiment of the present disclosure from another angle.

[0039] Figure 3 is a three-dimensional schematic diagram with the outer shell of Figure 1 omitted.

[0040] Figure 4 is a cross-sectional view after being cut along section line AA in Figure 3.

[0041] Figure 5 is an exploded view of the valve plate and yoke plate.

[0042] Figure 6 is a three-dimensional schematic diagram of the second shell after it is connected to the shielding component.

[0043] Figure 7 is a cross-sectional view after being cut along the BB section line in Figure 1.

[0044] Figure 8 is a top view of the valve plate.

[0045] Figure 9 is a sectional view after being cut along the CC section line in Figure 8.

[0046] Figure 10 is a schematic diagram of multiple valve plates stacked together.

[0047] Figure 11 is a schematic diagram of a contact cavity with multiple pressure relief holes.

[0048] The reference numerals in the attached drawings are explained as follows: 10, contact cavity; 101, first chamber; 102, second chamber; 11, insulating cover; 111, ceramic cover; 111a, opening; 112, frame plate; 12, yoke plate; 121, first through hole; 122, pressure relief hole; 13, metal cover; 20, stationary contact; 30, moving assembly; 31, moving contact plate; 32, first elastic element; 33, push rod assembly; 40, magnetic circuit part; 41, moving iron core; 42, stationary iron core; 421, second through hole; 43, coil frame; 44, coil winding; 46, second elastic element; 50, exhaust structure; 51, valve plate; 511, blasting part; 512, connecting part; 70. Outer shell; 70a. Cavity; 71. First shell; 72. Second shell; 721. Bottom wall; 722. Cylindrical side wall; 7221. First side wall; 7222. Second side wall; 73. Vent; 74. Shield; 741. First end; 742. Second end; 75. Vent passage. Detailed Implementation

[0049] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0050] It is understood that the terms "comprising" and "having," and any variations thereof, used in the embodiments of this disclosure, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, methods, products, or apparatus.

[0051] As shown in Figures 1 to 4, the relay of this embodiment includes a housing 70, a contact cavity 10, a pair of stationary contacts 20, a moving assembly 30, and a magnetic circuit portion 40. The contact cavity 10, the pair of stationary contacts 20, the moving assembly 30, and the magnetic circuit portion 40 are disposed within the housing 70. The pair of stationary contacts 20 are mounted on the contact cavity 10 and are respectively used to connect to the positive and negative terminals of the load. The moving assembly 30 is movably disposed within the contact cavity 10 and is used to switch the relay from a closed state to an open state and from an open state to a closed state. When the relay is in the closed state, the moving assembly 30 is in contact with the pair of stationary contacts 20; when the relay is in the open state, the moving assembly 30 is disconnected from the pair of stationary contacts 20. The magnetic circuit portion 40 is configured to drive the moving assembly 30 to move in response to an input signal, thereby switching the relay between the closed and open states.

[0052] As an example, the outer casing 70 may include a first casing 71 and a second casing 72 connected together to form a cavity 70a (as shown in Figure 7). The shape of the first casing 71 and the second casing 72 connected together may be a cuboid, a cylinder, etc., and this disclosure does not limit this.

[0053] In one embodiment, both the first shell 71 and the second shell 72 are cuboid in shape and each has an opening on one side. The opening of the first shell 71 is opposite to the opening of the second shell 72, and the first shell 71 and the second shell 72 are fastened together to form a cavity 70a.

[0054] Of course, in other embodiments, the first shell 71 can be a flat plate structure, and the second shell 72 can be a cuboid shape with an opening. After the first shell 71 and the second shell 72 are fastened together, a cavity 70a is formed.

[0055] As shown in Figure 4, the contact cavity 10 includes an insulating cover 11, a yoke plate 12, and a metal cover 13. The insulating cover 11 covers one side of the yoke plate 12 along its thickness direction, and the metal cover 13 covers the other side of the yoke plate 12 along its thickness direction. The insulating cover 11 and the yoke plate 12 form a first cavity 101, and the metal cover 13 and the yoke plate 12 form a second cavity 102. The yoke plate 12 has a first through hole 121, which penetrates the yoke plate 12 along its thickness direction, and the first cavity 101 and the second cavity 102 are connected through the first through hole 121.

[0056] In one embodiment, the insulating cover 11 may include a ceramic cover 111 and a frame plate 112. The ceramic cover 111 is made of ceramic material and is connected to the yoke plate 12 via the frame plate 112. The frame plate 112 may be a ring-shaped metal component, for example, made of an iron-nickel alloy. One end of the frame plate 112 is connected to the opening edge of the ceramic cover 111, for example, by laser welding, brazing, resistance welding, or adhesive bonding. The other end of the frame plate 112 is connected to the yoke plate 12, for example, by laser welding, brazing, resistance welding, or adhesive bonding.

[0057] The top wall of the ceramic cover 111 has two openings 111a, and a pair of stationary contacts 20 are respectively inserted into the two openings 111a. Each stationary contact 20 can be connected to the ceramic cover 111 by welding, but is not limited to this method.

[0058] Please refer to Figure 4. The moving assembly 30 includes a moving contact 31, a first elastic element 32, and a push rod member 33. The moving contact 31 is used to contact or separate from a pair of stationary contacts 20; wherein, when the relay is in the closed state, the moving contact 31 is in contact with a pair of stationary contacts 20; when the relay is in the open state, the moving contact 31 is separated from a pair of stationary contacts 20. The push rod member 33 is used to drive the moving contact 31 to move.

[0059] The moving contact 31 has moving contacts at both ends along its length, and the stationary contact 20 has stationary contacts. Both the moving contacts and the stationary contacts are located in the first chamber 101 of the contact cavity 10. The moving contacts are used to contact or separate from the stationary contacts.

[0060] The push rod member 33 is movably inserted through the first through hole 121 of the yoke plate 12, and part of the push rod member 33 extends out of the surface of the yoke plate 12 facing the stationary contact 20, and part of the push rod member 33 extends out of the surface of the yoke plate 12 away from the stationary contact 20.

[0061] The movable contact 31 is movably mounted on the push rod member 33. The first elastic member 32 is connected to the push rod member 33 and the movable contact 31, and is used to apply an elastic force to the movable contact 31 in the direction of the stationary contact 20 to provide contact pressure.

[0062] As an example, the first elastic element 32 is a spring or a leaf spring, but is not limited thereto. In addition, the number of the first elastic elements 32 can be one or more. When the number of the first elastic elements 32 is multiple, all of the multiple first elastic elements 32 can be springs, or all of them can be leaf springs, or they can be a combination of leaf springs and springs. This disclosure does not particularly limit this.

[0063] Please refer to Figure 4. The magnetic circuit section 40 includes a moving iron core 41, a stationary iron core 42, a coil frame 43, and a coil winding 44. The coil frame 43 is a hollow cylindrical shape and is made of insulating material. The coil frame 43 is located on the side of the yoke plate 12 facing away from the stationary contact 20 and surrounds the outer periphery of the metal cover 13. The coil winding 44 is wound around the outer periphery of the coil frame 43.

[0064] The stationary iron core 42 is fixedly disposed within the metal cover 13, with a portion of the stationary iron core 42 inserted into the first through hole 121. The stationary iron core 42 has a second through hole 421, which corresponds in position to the first through hole 121, allowing the push rod member 33 to be movably inserted into both the first and second through holes 121. The moving iron core 41 is movably disposed within the metal cover 13 and is positioned opposite the stationary iron core 42 in the thickness direction of the yoke plate 12. The moving iron core 41 is connected to the push rod member 33 and is attracted by the stationary iron core 42 when the coil winding 44 is energized. The moving iron core 41 and the push rod member 33 can be connected by screwing, riveting, welding, or other methods.

[0065] As shown in Figure 4, the magnetic circuit part 40 also includes a second elastic element 46. The second elastic element 46 is located inside the metal cover 13 and is disposed between the stationary iron core 42 and the moving iron core 41. When the coil winding 44 is de-energized, the second elastic element 46 can provide elastic force to the moving iron core 41 so that the moving iron core 41 is reset.

[0066] In one embodiment, the second elastic element 46 is a spring and is sleeved on the outer periphery of the push rod member 33, but is not limited thereto.

[0067] It should be noted that when the coil winding 44 is energized, the stationary iron core 42 attracts the moving iron core 41 to move upward, and the moving iron core 41 can drive the push rod component 33 to move upward. When the moving contact 31 contacts the stationary contact 20, the moving contact 31 is stopped by the stationary contact 20, while the push rod component 33 will continue to move upward until it has completed its overtravel.

[0068] During the overtravel process, the first elastic element 32, after being squeezed by the push rod member 33, can provide elastic force to the moving contact piece 31 to provide contact pressure.

[0069] As shown in Figures 4 and 5, the shell wall of the contact cavity 10 has a pressure relief hole 122, which penetrates the inner and outer wall surfaces of the shell wall and communicates with the cavity 70a.

[0070] The relay in this embodiment of the present disclosure also includes an exhaust structure 50, which is configured to open the pressure relief port 122.

[0071] In one embodiment, the exhaust structure 50 includes a valve plate 51 disposed on the contact cavity 10 and covering the pressure relief hole 122. The structural strength of the valve plate 51 is less than the structural strength of the contact cavity 10. The valve plate 51 is configured to rupture and open the pressure relief hole 122 when the gas pressure in the contact cavity 10 is greater than or equal to a threshold, and to seal the pressure relief hole 122 when the gas pressure in the contact cavity 10 is less than the threshold.

[0072] Understandably, when the relay is in normal operating condition, the gas pressure in the contact cavity 10 is less than the threshold value. At this time, the valve plate 51 is not ruptured by the gas pressure in the contact cavity 10, and the exhaust structure 50 maintains a closed pressure relief hole 122. When the relay is in abnormal operating condition, the gas pressure in the contact cavity 10 is greater than or equal to the threshold value. At this time, the valve plate 51 is ruptured by the gas pressure in the contact cavity 10, and the gas pressure in the contact cavity 10 can be released into the cavity 70a of the outer casing 70 through the pressure relief hole 122.

[0073] In other words, under abnormal operating conditions, as the gas pressure inside the contact cavity 10 gradually increases, the gas pressure will first break through the valve plate 51, causing the rapidly rising gas pressure to be released through the pressure relief hole 122. This prevents the gas pressure inside the contact cavity 10 from continuing to rise and thus avoids reaching the structural strength of the contact cavity 10, preventing an explosion. Under normal operating conditions, the gas pressure inside the contact cavity 10 will not break through the valve plate 51, and the exhaust structure 50 can still seal the pressure relief hole 122.

[0074] It is understandable that the term "normal operating condition" refers to the relay operating at its rated current, while the term "abnormal operating condition" refers to the moment when the moving contact 31 and the stationary contact 20 are subjected to a high-current short circuit or an overload trip. Furthermore, the pressure represented by the term "threshold" is slightly greater than the gas pressure within the contact cavity 10 when the relay is operating normally. The threshold value may be adjusted depending on the relay model, but it cannot exceed the structural strength of the contact cavity 10.

[0075] In other words, when the relay is in normal working condition, the pressure inside the contact cavity 10 will not reach this threshold, and the valve plate 51 will not be ruptured. When the relay is in abnormal working condition, the pressure inside the contact cavity 10 is greater than or equal to this threshold, and the valve plate 51 can be ruptured by the gas.

[0076] Understandably, when valve plate 51 closes the pressure relief hole 122, it can maintain the sealing of the contact cavity 10 and ensure the normal operation of the relay.

[0077] Therefore, the relay in this embodiment of the present disclosure, by setting a valve plate 51 to release overpressure gas, ensures that the relay will not explode and disintegrate due to the rapid expansion of gas caused by the high temperature inside the contact cavity 10 under abnormal operating conditions such as short circuit and overload disconnection, thereby increasing the reliability of the product.

[0078] The valve plate 51 disposed on the contact cavity 10 can be implemented in various ways. For example, in one embodiment, the valve plate 51 can be directly connected to the contact cavity 10; in another embodiment, the valve plate 51 can also be indirectly connected to the contact cavity 10 through an adapter.

[0079] Furthermore, the valve plate 51 can be connected to the inner wall surface of the contact cavity 10 or the outer wall surface of the contact cavity 10, and this disclosure does not limit it in this way.

[0080] In one embodiment, the valve plate 51 may be made of ceramic material.

[0081] In one embodiment, the design where the structural strength of the valve plate 51 is less than that of the contact cavity 10 can be achieved through different materials and / or structures. For example, when the materials of the valve plate 51 and the shell wall of the contact cavity 10 are the same, the thickness of the valve plate 51 can be designed to be thinner and less than the thickness of the cavity wall of the contact cavity 10, so that the gradually increasing temperature gas can preferentially break through the valve plate 51. Of course, when the thickness of the valve plate 51 and the cavity wall of the contact cavity 10 are the same, the valve plate 51 can be made of ceramic, while the contact cavity 10 can be made of metal, which will also allow the valve plate 51 to be broken through first. Alternatively, the valve plate 51 can be thinner and made of ceramic, while the cavity wall of the contact cavity 10 can be thicker and made of metal. Of course, other suitable methods can also be used to make the structural strength of the valve plate 51 less than that of the contact cavity 10, which will not be listed here.

[0082] It should be added that the number of pressure relief holes 122 can be one or more. When there is only one pressure relief hole 122, it can be located on any one of the ceramic cover 111, frame plate 112, yoke plate 12, and metal cover 13. When there are multiple pressure relief holes 122, they can be located on any one or more of the ceramic cover 111, frame plate 112, yoke plate 12, and metal cover 13. For example, when there are two pressure relief holes 122, both pressure relief holes 122 can be located on the yoke plate 12 simultaneously, or one pressure relief hole 122 can be located on the ceramic cover 111 and the other pressure relief hole 122 can be located on the yoke plate 12.

[0083] Figure 5 shows that there is one pressure relief hole 122, which is located on the yoke plate 12. The pressure relief hole 122 penetrates the yoke plate 12 along the thickness direction and is covered by the insulating cover 11.

[0084] Taking the pressure relief hole 122 located on the yoke plate 12 as an example, one side of the yoke plate 12 in the thickness direction may have a groove, and at least a portion of the valve plate 51 is disposed within the groove. When the valve plate 51 is disposed within the groove, the surface of the valve plate 51 may be flush with or not flush with the surface of the yoke plate 12. When the surface of the valve plate 51 is not flush with the surface of the yoke plate 12, the surface of the valve plate 51 may be higher than or lower than the surface of the yoke plate 12.

[0085] As shown in Figures 1 and 2, the outer casing 70 also has a through vent 73, which communicates with the cavity 70a. The number of vents 73 can be one or more, and this disclosure does not limit this.

[0086] When the gas in the contact cavity 10 breaks through the valve plate 51 and is discharged from the contact cavity 10 into the outer shell 70, the gas can be discharged to the outside of the outer shell 70 in a timely manner through the vent hole 73, thus avoiding a large amount of gas remaining in the outer shell 70 and reducing the risk of the outer shell 70 cracking due to gas pressure.

[0087] As shown in Figures 6 and 7, the outer casing 70 is also provided with a shielding member 74, which shields at least a portion of the air outlet 73 and forms an air outlet channel 75 with the inner wall surface of the outer casing 70, which communicates with both the air outlet 73 and the cavity 70a.

[0088] In this embodiment of the present disclosure, a shielding member 74 is provided inside the housing 70 to block the vent 73, and the shielding member 74 and the housing wall of the housing 70 form a venting channel 75 that communicates with both the vent 73 and the cavity 70a. When gas breaks through the valve plate 51 and begins to release, the gas first impacts the shielding member 74, and then flows through the venting channel 75 to the vent 73 (the dashed line in Figure 7 indicates the airflow direction). This design avoids the gas pressure from acting directly on the area around the vent 73, thereby reducing the risk of cracking of the structure around the vent 73 of the housing 70. In addition, since the shielding member 74 blocks at least a portion of the vent 73, the internal structure of the relay cannot be directly seen when viewed from the outside of the housing 70 through the vent 73, improving aesthetics.

[0089] In one embodiment, at least one of the first shell 71 and the second shell 72 has a vent 73. For example, in one embodiment, the first shell 71 has a vent 73, while the second shell 72 does not have a vent 73; in another embodiment, the first shell 71 does not have a vent 73, while the second shell 72 has a vent 73; in yet another embodiment, both the first shell 71 and the second shell 72 have a vent 73.

[0090] The shield 74 can be connected to the housing 70, the contact cavity 10, or the coil frame 43 of the magnetic circuit section 40. Here, "connection" can be a separate connection or an integral connection.

[0091] When the shield 74 is connected to the housing 70, the shield 74 can be connected to the first housing 71, or to the second housing 72, or to both the first housing 71 and the second housing 72.

[0092] As shown in Figure 6, the second shell 72 has a bottom wall 721 and a cylindrical side wall 722. The cylindrical side wall 722 has openings at both ends. The bottom wall 721 is connected to the cylindrical side wall 722 and covers one opening of the cylindrical side wall 722. The cylindrical side wall 722 has an air vent 73. A shielding member 74 is connected to the bottom wall 721, and an air venting channel 75 is formed between the shielding member 74 and the cylindrical side wall 722.

[0093] It is understood that the shape enclosed by the cylindrical sidewall 722 can be rectangular, circular or other shapes, and this disclosure does not limit it.

[0094] In one embodiment, the cylindrical sidewall 722 includes two first sidewalls 7221 and two second sidewalls 7222 connected to the bottom wall 721. The two first sidewalls 7221 are arranged in parallel, and the two second sidewalls 7222 are arranged in parallel. The two first sidewalls 7221 and the two second sidewalls 7222 are alternately connected end to end to form a rectangular ring structure. The first sidewalls 7221 have vent holes 73 near the second sidewalls 7222.

[0095] As shown in Figure 7, the shielding member 74 has a first end 741 and a second end 742. The distance between the first end 741 and the first sidewall 7221 is L1, and the distance between the second end 742 and the first sidewall 7221 is L2. L1 is greater than L2, so that the opening size of one end of the air outlet channel 75 is larger than the opening size of the other end. In this way, gas can more easily enter the air outlet channel 75 from the end with the larger opening size.

[0096] As shown in Figures 8 and 9, the valve plate 51 includes a bursting portion 511 and a connecting portion 512. The connecting portion 512 surrounds the outer periphery of the bursting portion 511 and is connected to the contact cavity 10. The structural strength of the bursting portion 511 is less than the structural strength of the connecting portion 512. The exhaust structure 50 is configured to close the pressure relief port 122 when the gas pressure in the contact cavity 10 is less than a threshold value, and to rupture the bursting portion 511 to open the pressure relief port 122 when the gas pressure in the contact cavity 10 is greater than or equal to the threshold value.

[0097] In this embodiment of the present disclosure, the connecting portion 512 is connected around the outer periphery of the rupture portion 511, and the structural strength of the connecting portion 512 is greater than that of the rupture portion 511. On the one hand, the structural strength of the rupture portion 511 is low, so it can be quickly ruptured by the gas in the contact cavity 10 and the gas can be released in time. On the other hand, the structural strength of the connecting portion 512 is high, so when the connecting portion 512 is connected to the contact cavity 10, the stress-bearing capacity of the connecting portion 512 is improved, thereby avoiding the rupture of the rupture portion 511 due to the transmission of welding stress to the rupture portion 511.

[0098] In one embodiment, the valve plate 51 has a sheet-like structure, such as a circular sheet, a rectangular sheet, an oval sheet, or an elliptical sheet. The thickness t1 of the rupture portion 511 is less than the thickness t2 of the connecting portion 512. In other words, in this embodiment, by controlling the thickness of the rupture portion 511 to be less than the thickness of the connecting portion 512, the structural strength of the rupture portion 511 is made less than the structural strength of the connecting portion 512.

[0099] Of course, in other embodiments, the materials of the blasting part 511 and the connecting part 512 can be designed to be different to achieve different structural strengths. For example, the blasting part 511 can be made of ceramic material and the connecting part 512 can be made of metal material.

[0100] As shown in Figure 10, the exhaust structure 50 includes a plurality of stacked valve plates 51, each valve plate 51 being the valve plate 51 described in the above embodiment. In two adjacent valve plates 51, two adjacent connecting portions 512 are connected, and two adjacent bursting portions 511 are spaced apart along the thickness direction of the valve plate 51. The adjacent connecting portions 512 can be connected by welding, adhesive bonding, or other methods; this disclosure does not impose any particular limitation on this method.

[0101] In this embodiment of the present disclosure, multiple valve plates 51 are stacked and adjacent bursting parts 511 are arranged at intervals. On the one hand, when the relay is in an abnormal working state, multiple bursting parts 511 burst and release pressure in sequence; on the other hand, when the relay is in a normal working state, the probability of multiple bursting parts 511 bursting simultaneously is much less than the probability of only one bursting part 511 bursting. Therefore, the design of multiple bursting parts 511 improves the sealing reliability of the contact cavity 10 in a normal working state.

[0102] As shown in Figure 11, the contact cavity 10 has multiple pressure relief holes 122, and the relay includes multiple venting structures 50. The positions of the multiple venting structures 50 correspond to the positions of the multiple pressure relief holes 122, and are used to close the multiple pressure relief holes 122.

[0103] In this embodiment, the contact cavity 10 has multiple pressure relief holes 122, which increases the discharge capacity to quickly expel high-pressure gas. Furthermore, since there are multiple pressure relief holes 122, the area of ​​each pressure relief hole 122 can be set smaller while maintaining the overall discharge capacity, thus allowing for more flexible placement of each pressure relief hole 122. For example, some pressure relief holes 122 can be located in the insulating cover, while others can be located in the yoke plate, etc.

[0104] In one embodiment, the thickness of the burst portion 511 of the valve plate 51 in the plurality of exhaust structures 50 is not equal.

[0105] In this embodiment of the present disclosure, the thickness of the bursting parts 511 of the multiple exhaust structures 50 is not equal, so that the thinner bursting parts 511 rupture first and the thicker bursting parts 511 rupture later. In this way, the high-pressure gas can be released sequentially and orderly into the cavity surrounded by the outer shell 70, avoiding the problem of the outer shell 70 cracking due to the concentrated release of multiple pressure relief holes 122 into the outer shell 70 and the inability of the outer shell 70 to release the gas in time.

[0106] The unequal thickness of the blasting portions 511 in the multiple exhaust structures 50 should be understood as follows: the thickness of the blasting portions 511 in the multiple exhaust structures 50 is not equal; or, among the blasting portions 511 in the multiple exhaust structures 50, at least one blasting portion 511 has a thickness that is not equal to the thickness of the other blasting portions 511. For example, taking the blasting portions 511 of three exhaust structures 50 as an example, the thickness of the blasting portion 511 of one exhaust structure 50 is less than the thickness of the blasting portions 511 of the other two exhaust structures 50, and the thickness of the blasting portions 511 of the other two exhaust structures 50 is equal.

[0107] In summary, the relays of the present disclosure embodiments have at least the following advantages and beneficial effects:

[0108] The relay of this embodiment has several advantages. First, by providing a valve plate 51 to release overpressure gas, it ensures that the relay will not explode or disintegrate due to the rapid expansion of gas caused by the high temperature inside the contact cavity 10 under abnormal operating conditions such as short circuits and overload disconnection, thus increasing the reliability of the product. Second, since the housing 70 has a vent hole 73, the gas can be discharged to the outside of the housing 70 in a timely manner through the vent hole 73, avoiding a large amount of gas remaining inside the housing 70 and reducing the risk of the housing 70 cracking due to gas pressure. Third, by providing a shielding member 74 inside the housing 70 that can block the vent hole 73, and the shielding member 74 and the housing wall of the housing 70 form a venting channel 75 that communicates with both the vent hole 73 and the cavity 70a. When the gas breaks through the valve plate 51 and begins to release, the gas will first impact the shielding member 74, and then flow through the venting channel 75 to the vent hole 73 (the dotted line in Figure 7 indicates the airflow direction). This design prevents gas pressure from acting directly on the area around the vent 73, thereby reducing the risk of cracking in the structure around the vent 73 of the housing 70. Furthermore, the shielding member 74 blocks at least a portion of the vent 73, so the internal structure of the relay cannot be directly seen when viewed from the outside of the housing 70 through the vent 73, improving aesthetics.

[0109] Furthermore, the connecting portion 512 is connected around the outer periphery of the rupture portion 511, and the structural strength of the connecting portion 512 is greater than that of the rupture portion 511. On the one hand, the structural strength of the rupture portion 511 is low, so it can be quickly ruptured by the gas in the contact cavity 10 and the gas can be released in time. On the other hand, the structural strength of the connecting portion 512 is high, so when the connecting portion 512 is connected to the contact cavity 10, the stress-bearing capacity of the connecting portion 512 is improved, thereby avoiding the rupture of the rupture portion 511 due to the transmission of welding stress to the rupture portion 511.

[0110] Furthermore, multiple valve plates 51 are stacked and adjacent bursting sections 511 are arranged at intervals. On the one hand, when the relay is in an abnormal working state, multiple bursting sections 511 will burst and release pressure in sequence; on the other hand, when the relay is in a normal working state, the probability of multiple bursting sections 511 bursting simultaneously is much less than the probability of only one bursting section 511 bursting. Therefore, the design of multiple bursting sections 511 improves the sealing reliability of the contact cavity 10 in the normal working state.

[0111] Furthermore, the contact cavity 10 has multiple pressure relief holes 122, which increases the discharge capacity to quickly expel high-pressure gas. In addition, with multiple pressure relief holes 122, the area of ​​each pressure relief hole 122 can be set smaller while maintaining the overall discharge capacity, thus allowing for more flexible placement of each pressure relief hole 122. For example, some pressure relief holes 122 can be located in the insulating cover, while others can be located in the yoke plate, etc.

[0112] Furthermore, the thickness of the bursting parts 511 of the multiple exhaust structures 50 is not equal, so that the thinner bursting parts 511 rupture first and the thicker bursting parts 511 rupture later. In this way, the high-pressure gas can be released sequentially and orderly into the cavity enclosed by the outer shell 70, avoiding the problem of the outer shell 70 cracking due to multiple pressure relief holes 122 being concentrated and released into the outer shell 70, and the outer shell 70 being unable to release the gas in time.

[0113] It is understood that the various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions, and will not be described in detail here.

[0114] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0115] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0116] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0117] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A housing for a relay, the housing having a cavity and a through vent; the housing also having a shielding member inside, the shielding member shielding at least a portion of the vent and forming a venting channel with the inner wall of the housing that communicates with both the vent and the cavity.

2. The housing of the relay according to claim 1, wherein, The outer casing includes a first shell and a second shell, which are connected to form the cavity, and at least one of the first shell and the second shell has the vent.

3. The housing of the relay according to claim 1, wherein, The shielding component is separately connected to the outer shell, or the shielding component is integrally connected to the outer shell.

4. The housing of the relay according to claim 1, wherein, The outer casing has a bottom wall and a cylindrical side wall, the cylindrical side wall is connected to the bottom wall, the cylindrical side wall has the air vent, the shield is connected to the bottom wall, and the shield and the cylindrical side wall form the air vent channel.

5. The housing of the relay according to claim 4, wherein, The cylindrical sidewall includes two first sidewalls and two second sidewalls connected to the bottom wall. The two first sidewalls are arranged in parallel, and the two second sidewalls are arranged in parallel. The two first sidewalls and the two second sidewalls are alternately connected end to end to form a ring structure. The first sidewall has the air outlet located near the second sidewall.

6. The housing of the relay according to claim 1, wherein, The shielding member has a first end and a second end, and the distance between the first end and the outer shell is greater than the distance between the second end and the outer shell, so that the opening size of one end of the air outlet channel is greater than the opening size of the other end.

7. A relay comprising the housing as described in any one of claims 1-6.

8. The relay according to claim 7, wherein, The relay also includes: A contact cavity is disposed within the cavity, the contact cavity having a through pressure relief hole communicating with the cavity; and An exhaust structure is provided on the contact cavity and configured to open the pressure relief port.

9. The relay according to claim 8, wherein, The exhaust structure includes a valve plate disposed on the contact cavity and configured to rupture and open the pressure relief port when the gas pressure in the contact cavity is greater than or equal to a threshold.

10. The relay according to claim 9, wherein, The structural strength of the valve plate is less than that of the contact cavity.

11. The relay according to claim 10, wherein, The valve plate and the contact cavity are made of different materials; and / or, the thickness of the valve plate is different from the thickness of the shell wall of the contact cavity.

12. The relay according to claim 9, wherein, The valve plate covers the pressure relief hole.

13. The relay according to claim 9, wherein, The relay also includes a moving contact and a stationary contact, which are located in the contact cavity. The stationary contact is fixed relative to the contact cavity, and the moving contact is used to contact or separate from the stationary contact.

14. The relay according to claim 9, wherein, The contact cavity includes an insulating cover and a yoke plate. The insulating cover is disposed on one side surface of the yoke plate in the thickness direction. The insulating cover and / or the yoke plate have the pressure relief hole, which communicates with the internal space of the insulating cover.

15. The relay according to claim 9, wherein, The valve plate is also configured to seal the pressure relief port when the gas pressure in the contact cavity is less than the threshold.

16. The relay according to claim 9, wherein, The valve plate has a bursting portion and a connecting portion, the connecting portion being connected around the outer periphery of the bursting portion and connected to the contact cavity, the structural strength of the bursting portion being less than the structural strength of the connecting portion; the bursting portion is configured to rupture to open the pressure relief hole when the gas pressure in the contact cavity is greater than or equal to a threshold.

17. The relay according to claim 16, wherein, The thickness of the blasting section is less than the thickness of the connecting section.

18. The relay according to claim 16, wherein, The exhaust structure includes multiple stacked valve plates; In two adjacent valve plates, the two adjacent connecting portions are connected, and the two adjacent bursting portions are arranged at intervals along the thickness direction of the valve plate.

19. The relay according to claim 16, wherein, The contact cavity has multiple pressure relief holes, and the relay includes multiple venting structures. The positions of the multiple venting structures correspond to the positions of the multiple pressure relief holes, and are used to close the multiple pressure relief holes.

20. The relay according to claim 19, wherein, The thickness of the burst portion of the valve plate in the plurality of exhaust structures is not equal.

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