Relay

Abstract

The utility model discloses a relay. The relay comprises a packaging cavity and a valve assembly. An inner cavity is formed in the packaging cavity, and a pressure relief hole communicated with the inner cavity is formed in the cavity wall of the inner cavity; the valve assembly comprises a valve plate provided with a blasting part and a connecting part, the connecting part is connected to the outer periphery of the blasting part in a surrounding mode and connected to the cavity wall of the inner cavity, and the structural strength of the blasting part is smaller than that of the connecting part; the blasting part is configured to be broken to open the pressure relief hole when the gas pressure in the inner cavity is larger than or equal to a threshold value.

Description

Technical Field

[0001] This application relates to the technical field of electronic control devices, and more particularly, to a relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is usually applied to an automatic control circuit. In fact, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays roles such as automatic regulation, safety protection, and circuit conversion in a circuit.

[0003] During operation, when the short-circuit load is very large, the moving contact and the stationary contact of a high-voltage DC relay will bounce due to the electro-dynamic repulsive force generated by the short-circuit current, and then arc will occur at the contact. Since the short-circuit current and voltage of the load are both very high, intense arcing occurs instantaneously between the moving contact and the stationary contact, which may cause the relay to explode easily and pose a great safety hazard. Utility Model Content

[0004] An embodiment of this application provides a relay to solve the problem that the relay in the related art is prone to explosion.

[0005] The relay according to the embodiment of this application includes:

[0006] An encapsulation cavity that forms an inner cavity inside, and the cavity wall of the inner cavity has a pressure relief hole communicating with the inner cavity; and

[0007] A valve assembly including a valve plate having a bursting portion and a connecting portion, the connecting portion is circumferentially connected to the outer periphery of the bursting portion and is connected to the cavity wall of the inner cavity, and the structural strength of the bursting portion is less than that of the connecting portion; the bursting portion is configured to rupture to open the pressure relief hole when the gas pressure in the inner cavity is greater than or equal to a threshold value.

[0008] According to some embodiments of this application, the valve assembly further includes an adapter ring, and the connecting portion is connected to the cavity wall of the inner cavity through the adapter ring.

[0009] According to some embodiments of this application, one end of the adapter ring is connected to the surface in the thickness direction of the connecting portion, and the other end is connected to the cavity wall of the inner cavity.

[0010] According to some embodiments of this application, the adapter ring includes a vertical section and an extension section, and the extension section extends out of the outer peripheral surface of the vertical section;

[0011] One of the vertical section and the extension section is connected to the connecting portion, and the other is connected to the cavity wall of the inner cavity.

[0012] According to some embodiments of the present application, the adapter ring further includes a bending section, and the vertical section is connected to the extension section through the bending section.

[0013] According to some embodiments of the present application, the vertical section is perpendicular to the extension section.

[0014] According to some embodiments of the present application, the adapter ring and the connecting portion are made of different materials and are connected by welding;

[0015] The structural strength of the adapter ring is less than that of the connecting portion.

[0016] According to some embodiments of the present application, the blasting portion and the connecting portion are of an integral structure or a split structure.

[0017] According to some embodiments of the present application, the valve plate includes a flat plate and a connecting ring in a split structure. The flat plate covers one surface of the connecting ring in the thickness direction, and the outer peripheral surface of the connecting ring is flush with the outer peripheral edge of the flat plate;

[0018] Wherein, the connecting ring and the part of the flat plate connected to the connecting ring constitute the connecting portion, and the remaining part of the flat plate constitutes the blasting portion.

[0019] According to some embodiments of the present application, the valve plate includes a flat plate and two connecting rings in a split structure. The two connecting rings are respectively connected to both surfaces of the flat plate in the thickness direction, and the outer peripheral surface of each connecting ring is flush with the outer peripheral edge of the flat plate;

[0020] Wherein, the two connecting rings and the part of the flat plate connected to the connecting ring constitute the connecting portion, and the remaining part of the flat plate constitutes the blasting portion.

[0021] According to some embodiments of the present application, the connecting portion has a first surface and a second surface arranged opposite to each other in the thickness direction, and the blasting portion has a third surface and a fourth surface arranged opposite to each other in the thickness direction;

[0022] The third surface is flush with the first surface, the fourth surface is located within the space enclosed by the connecting portion, and the second surface is connected to the cavity wall of the inner cavity.

[0023] According to some embodiments of the present application, the connecting portion has a first surface and a second surface arranged opposite to each other in the thickness direction, and the blasting portion has a third surface and a fourth surface arranged opposite to each other in the thickness direction;

[0024] The third surface is lower than the first surface, and the fourth surface is lower than the second surface.

[0025] According to some embodiments of the present application, the valve assembly includes a plurality of valve sheets stacked;

[0026] Among two adjacent valve sheets, two adjacent connection parts are connected, and two adjacent bursting parts are arranged at intervals along the thickness direction of the valve sheet.

[0027] According to some embodiments of the present application, a transition part is formed at the connection position between the inner peripheral surface of the connection part and one side surface of the bursting part in the thickness direction.

[0028] According to some embodiments of the present application, the transition part is any of the following structures: a chamfer, an inner arc angle, or a combination of a chamfer and an inner arc angle.

[0029] According to some embodiments of the present application, the connection part and the bursting part are of a split structure and are connected by welding or bonding;

[0030] The transition part is formed by the accumulation of solder or glue.

[0031] According to some embodiments of the present application, the cavity wall of the inner cavity has a plurality of pressure relief holes, the relay includes a plurality of valve assemblies, and the positions of the plurality of valve assemblies correspond to the positions of the plurality of pressure relief holes for closing the plurality of pressure relief holes.

[0032] According to some embodiments of the present application, the thicknesses of the bursting parts in the plurality of valve assemblies are not equal.

[0033] According to some embodiments of the present application, the encapsulation cavity includes:

[0034] A yoke iron plate having a first through hole that penetrates the yoke iron plate along the thickness direction of the yoke iron plate;

[0035] An insulating cover connected to one side surface of the yoke iron plate in the thickness direction through a frame piece to form a first chamber; and

[0036] A metal cover connected to the other side surface of the yoke iron plate in the thickness direction to form a second chamber;

[0037] Wherein, the first chamber and the second chamber communicate through the first through hole and constitute the inner cavity.

[0038] According to some embodiments of the present application, the yoke iron plate has the pressure relief holes, and the valve assembly is connected to the yoke iron plate.

[0039] According to some embodiments of the present application, one side surface of the yoke iron plate in the thickness direction has a sunken groove, and the pressure relief hole penetrates the bottom surface of the sunken groove;

[0040] At least a part of the valve assembly is located in the sinking groove.

[0041] According to some embodiments of the present application, the insulating cover has the pressure relief hole, and the valve assembly is connected to the insulating cover.

[0042] According to some embodiments of the present application, the insulating cover includes:

[0043] a top wall; and

[0044] a side wall connected to the outer peripheral edge of the top wall; the top wall and / or the side wall has the pressure relief hole.

[0045] According to some embodiments of the present application, the frame piece has the pressure relief hole, and the valve assembly is connected to the frame piece.

[0046] According to some embodiments of the present application, the metal cover has the pressure relief hole, and the valve assembly is connected to the inner wall surface or the outer wall surface of the metal cover.

[0047] According to some embodiments of the present application, the inner cavity is a completely sealed chamber.

[0048] According to some embodiments of the present application, the valve assembly is configured to close the pressure relief hole when the gas pressure in the inner cavity is less than the threshold value.

[0049] According to some embodiments of the present application, the structural strength of the blasting part is less than that of the encapsulation cavity.

[0050] According to some embodiments of the present application, the material of the blasting part is different from that of the encapsulation cavity; and / or, the thickness of the blasting part is less than the thickness of the cavity wall of the inner cavity.

[0051] According to some embodiments of the present application, the blasting part is made of ceramic material.

[0052] According to some embodiments of the present application, the thickness of the blasting part is less than the thickness of the connecting part.

[0053] According to some embodiments of the present application, the connecting part is welded to the encapsulation cavity.

[0054] One embodiment in the above application has at least the following advantages or beneficial effects:

[0055] In the relay according to the embodiment of the present application, the connecting portion surrounds and connects to the outer peripheral edge of the bursting portion, and the structural strength of the connecting portion is greater than that of the bursting portion. On the one hand, the structural strength of the bursting portion is relatively low, so that it can be quickly broken by the gas in the inner cavity to timely release the gas. On the other hand, the structural strength of the connecting portion is relatively high. When the connecting portion is connected to the encapsulation cavity, the stress-bearing capacity of the connecting portion is improved, thereby avoiding the bursting portion from cracking due to the transfer of welding stress to the bursting portion.

[0056] Further, a plurality of valve sheets are stacked, and adjacent bursting portions are arranged at intervals. On the one hand, when the relay is in an abnormal working state, the plurality of bursting portions burst and release pressure in sequence. On the other hand, when the relay is in a normal working state, the probability that the plurality of bursting portions burst simultaneously is much smaller than the probability that only one bursting portion bursts. Therefore, the design of the plurality of bursting portions improves the sealing reliability of the encapsulation cavity in the normal working state. On the other hand, adjacent bursting portions are arranged at intervals, so that the thickness of each bursting portion will not increase, ensuring that the bursting portion can burst and release pressure in time when the gas pressure in the inner cavity reaches the threshold.

[0057] Further, a plurality of pressure relief holes are provided on the cavity wall of the inner cavity, which can increase the discharge amount and improve the explosion resistance performance of the relay. In addition, on the premise that the overall discharge amount remains unchanged, the area of each pressure relief hole can be set to be relatively small, and thus the setting position of each pressure relief hole is more flexible.

[0058] Further, the thicknesses of the bursting portions of the plurality of valve assemblies are not equal, so that the thinner bursting portion bursts first and the thicker bursting portion bursts later. In this way, the high-pressure gas can be discharged into the chamber surrounded by the housing in an orderly manner, avoiding the problem that the high-pressure gas is simultaneously discharged from a plurality of pressure relief holes into the housing and the housing cannot discharge the high-pressure gas in time, thereby causing the housing to crack. Description of the Drawings

[0059] Figure 1 Fig. shows an exploded view of the relay according to the embodiment of the present application.

[0060] Figure 2 Fig. shows a cross-sectional view of the encapsulation cavity and the moving assembly.

[0061] Figure 3 Fig. shows a schematic diagram of the valve assembly according to the first embodiment of the present application.

[0062] Figure 4 Fig. shows along Figure 3 a cross-sectional view taken along the cutting line A-A in

[0063] Figure 5 Fig. shows a cross-sectional view of the valve assembly according to the second embodiment of the present application.

[0064] Figure 6Shown is a cross-sectional view of the valve assembly according to the third embodiment of the present application.

[0065] Figure 7 Shown is a cross-sectional view of the valve assembly according to the fourth embodiment of the present application.

[0066] Figure 8 Shown is a cross-sectional view of the valve assembly according to the fifth embodiment of the present application.

[0067] Figure 9 Shown is a cross-sectional view of the valve assembly according to the sixth embodiment of the present application.

[0068] Figure 10 Shown is a cross-sectional view of the valve assembly according to the seventh embodiment of the present application.

[0069] Figure 11 Shown is a cross-sectional view of the valve assembly according to the eighth embodiment of the present application.

[0070] Figure 12 Shown is a cross-sectional view of the valve assembly according to the ninth embodiment of the present application.

[0071] Figure 13 Shown is a cross-sectional view of the valve assembly according to the tenth embodiment of the present application.

[0072] Figure 14 Shown is a cross-sectional view of the valve assembly according to the eleventh embodiment of the present application.

[0073] Figure 15 Shown is a cross-sectional view of the valve assembly according to the twelfth embodiment of the present application.

[0074] Figure 16 Shown is a cross-sectional view of the valve assembly according to the thirteenth embodiment of the present application.

[0075] Figure 17 Shown is a cross-sectional view of the valve assembly according to the fourteenth embodiment of the present application.

[0076] Figure 18 Shown is a cross-sectional view of the valve assembly according to the fifteenth embodiment of the present application.

[0077] Figure 19 Shown is a cross-sectional view of the valve assembly according to the sixteenth embodiment of the present application.

[0078] Figure 20 Shown is a cross-sectional view in which a pressure relief hole is provided in the top wall of the insulating cover, and the valve assembly is connected to the top wall.

[0079] Figure 21 Shown is a schematic diagram in which a pressure relief hole is provided in the side wall of the insulating cover, and the valve assembly is connected to the side wall.

[0080] Figure 22Shown is another schematic view in which the side wall of the insulating cover is provided with a pressure relief hole and the valve assembly is connected to the side wall.

[0081] Figure 23 Shown is a cross-sectional view in which the frame sheet is provided with a pressure relief hole and the valve assembly is connected to the frame sheet.

[0082] Figure 24 Shown is a top view schematic view in which the yoke iron plate is provided with a pressure relief hole and the valve assembly is connected to the yoke iron plate.

[0083] Figure 25 Shown is Figure 24 exploded schematic view of

[0084] Figure 26 Shown is along Figure 24 cross-sectional view taken along the B-B cutting line in

[0085] Figure 27 Shown is that the metal cover is provided with a pressure relief hole and the valve assembly is connected to the inner surface of the metal cover.

[0086] Figure 28 Shown is that the metal cover is provided with a pressure relief hole and the valve assembly is connected to the outer surface of the metal cover.

[0087] Figures 29 to 32 Cross-sectional views showing the valve plates of four different embodiments connected to the top wall of the insulating cover through an adapter ring are respectively shown.

[0088] Figure 33 Shown is a cross-sectional view in which the valve plate is connected to the yoke iron plate through an adapter ring.

[0089] Figure 34 Shown is a cross-sectional view in which the valve plate is connected to the metal cover through an adapter ring.

[0090] Figure 35 Shown is a schematic view in which two valve assemblies are connected to the top wall of the insulating cover.

[0091] Figure 36 Shown is a schematic view in which two valve assemblies are connected to the side wall of the insulating cover.

[0092] Figure 37 Shown is a cross-sectional view in which two valve assemblies are connected to the frame sheet.

[0093] Figure 38 Shown is a cross-sectional view in which two valve assemblies are connected to the metal cover.

[0094] Figure 39 Shown is a top view schematic view in which two valve assemblies are connected to the yoke iron plate.

[0095] Figure 40 Shown is along Figure 39 cross-sectional view taken along the C-C cutting line in Detailed Implementation Modes

[0096] Example implementation modes will now be described more fully with reference to the accompanying drawings. However, the example implementation modes can be implemented in various forms and should not be construed as limited to the implementation modes set forth herein; rather, these implementation modes are provided so that this application will be thorough and complete, and will fully convey the concept of the example implementation modes to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0097] It can be understood that the terms "comprising" and "having" and any variations thereof in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products or devices.

[0098] As Figure 1 and Figure 2 shown, the relay in the embodiments of this application includes a housing 10, an insulating cover 21, a yoke iron plate 25, a pair of static contacts 22, an arc extinguishing portion 26, a moving assembly 30, and a magnetic circuit portion 40. The insulating cover 21, the yoke iron plate 25, a pair of static contacts 22, the arc extinguishing portion 26, the moving assembly 30, and the magnetic circuit portion 40 are disposed inside the housing 10.

[0099] Among them, the housing 10 includes a first housing 11 and a second housing 12, and the first housing 11 and the second housing 12 are connected to form a chamber for accommodating the insulating cover 21, the yoke iron plate 25, a pair of static contacts 22, the arc extinguishing portion 26, the moving assembly 30, and the magnetic circuit portion 40.

[0100] It can be understood that this application does not particularly limit the shapes of the first housing 11 and the second housing 12, as long as the first housing 11 and the second housing 12 can form a chamber for accommodating the insulating cover 21, the yoke iron plate 25, a pair of static contacts 22, the arc extinguishing portion 26, the moving assembly 30, and the magnetic circuit portion 40 after being connected. For example, in one implementation mode, the first housing 11 is in the shape of a rectangular parallelepiped with an opening, and the second housing 12 is in the shape of a plate, and the second housing 12 is buckled on the opening of the first housing 11. Among them, the first housing 11 and the second housing 12 can be connected by a snap connection method, but not limited thereto.

[0101] As Figure 2As shown, an insulating cover 21 is connected to a yoke iron plate 25 to form a first cavity 212. A pair of static contacts 22 are installed on the top of the insulating cover 21. At least part of each static contact 22 extends into the first cavity 212 formed by the insulating cover 21 and the yoke iron plate 25. And a static contact point is provided at the bottom of each static contact 22, and the static contact points can be integrally or separately arranged at the bottom of the static contacts 22. One static contact 22 serves as a terminal for current inflow, and the other static contact 22 serves as a terminal for current outflow.

[0102] In the embodiment of the present application, two openings 211 are provided at the top of the insulating cover 21, and each opening 211 communicates with the first cavity 212. A pair of static contacts 22 are respectively inserted into the two openings 211. And each static contact 22 and the insulating cover 21 can be connected by welding, but not limited thereto.

[0103] It can be understood that the insulating cover 21 can be made of ceramic material, that is, the insulating cover 21 is a ceramic cover, but not limited thereto. For example, in other embodiments, the insulating cover 21 can also be made of plastic material.

[0104] In the embodiment of the present application, the insulating cover 21 is made of ceramic material, and the insulating cover 21 is connected to the yoke iron plate 25 through a frame piece 24. The frame piece 24 can be a metal piece with an annular structure, such as iron-nickel alloy. One end of the frame piece 24 is connected to the opening edge of the insulating cover 21, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 24 is connected to the yoke iron plate 25, and can also be connected by laser welding, brazing, resistance welding, gluing, etc. A frame piece 24 is provided between the insulating cover 21 and the yoke iron plate 25 to facilitate the connection between the insulating cover 21 and the yoke iron plate 25.

[0105] The insulating cover 21 includes a top wall 213 and a side wall 214. One end of the side wall 214 is connected to the outer periphery of the top wall 213, and the other end of the side wall 214 is connected to the frame piece 24.

[0106] Two openings 211 are provided on the top wall 213, and a pair of static contacts 22 are respectively inserted into the two openings 211. Each static contact 22 and the top wall 213 can be connected by welding, but not limited thereto.

[0107] Please continue to refer to Figure 2 , the moving assembly 30 includes a moving contact piece 31, a first elastic member 32 and a push rod member 33. The moving contact piece 31 is movable between a first position in contact with a pair of static contacts 22 and a second position away from the pair of static contacts 22, and the push rod member 33 is used to drive the moving contact piece 31 to move.

[0108] For convenience of description, the arrangement direction of a pair of static contact terminals 22 is defined as the first direction D1, and the movement direction of the moving assembly 30 is defined as the second direction D2, wherein the first direction D1 is perpendicular to the second direction D2. The direction perpendicular to the first direction D1 and the second direction D2 is defined as the third direction D3.

[0109] The push rod member 33 is movably disposed through the first through hole 251 of the yoke iron plate 25, and a part of the push rod member 33 extends out of the side surface of the yoke iron plate 25 facing the static contact terminal 22, and a part of the push rod member 33 extends out of the side surface of the yoke iron plate 25 facing away from the static contact terminal 22.

[0110] The moving contact piece 31 is movably mounted on the part of the push rod member 33 extending out of the side surface of the yoke iron plate 25 facing the static contact terminal 22. The first elastic member 32 is connected between the push rod member 33 and the moving contact piece 31, and is used to apply an elastic force to the moving contact piece 31 in the direction of the static contact terminal 22 to provide contact pressure.

[0111] As an example, the first elastic member 32 is a spring or a leaf spring, but is not limited thereto. In addition, the number of the first elastic members 32 can be one or more. When the number of the first elastic members 32 is multiple, the multiple first elastic members 32 can all be springs, or all be leaf springs, or can also be a combination of leaf springs and springs. The present application does not make special limitations thereto.

[0112] A metal cover 27 is further disposed on the side surface of the yoke iron plate 25 facing away from the static contact terminal 22. The metal cover 27 covers the first through hole 251 of the yoke iron plate 25, and the metal cover 27 and the yoke iron plate 25 form a second chamber 271. The second chamber 271 communicates with the first chamber 212 through the first through hole 251. Wherein, the part of the push rod member 33 extending out of the side surface of the yoke iron plate 25 facing away from the static contact terminal 22 is inserted into the metal cover 27.

[0113] Please continue to refer to Figure 1 and Figure 2 , the magnetic circuit part 40 includes a moving iron core 41, a static iron core 42, a coil bobbin 43 and a coil 44. The coil bobbin 43 is in a hollow cylindrical shape and is made of an insulating material. The coil bobbin 43 is located on the side of the yoke iron plate 25 facing away from the static contact terminal 22 and surrounds the outer periphery of the metal cover 27. The coil 44 is wound around the outer periphery of the coil bobbin 43.

[0114] The static iron core 42 is fixedly arranged inside the metal cover 27, and a part of the static iron core 42 is inserted into the first through hole 251. The static iron core 42 has a second through hole 421, and the position of the second through hole 421 corresponds to that of the first through hole 251, so that the push rod member 33 can movably pass through the first through hole 251 and the second through hole 421. The moving iron core 41 is movably arranged inside the metal cover 27 and is oppositely arranged with the static iron core 42 in the second direction D2. The moving iron core 41 is connected to the push rod member 33 and is used to be attracted by the static iron core 42 when the coil 44 is energized. The moving iron core 41 and the push rod member 33 can be connected by screwing, riveting, welding or other means.

[0115] As Figure 2 shown, the magnetic circuit part 40 further includes a second elastic member 46. The second elastic member 46 is located inside the metal cover 27 and is arranged between the static iron core 42 and the moving iron core 41, and is used to reset the moving iron core 41 when the coil 44 is de-energized.

[0116] In one embodiment, the second elastic member 46 is a spring and is sleeved on the outer periphery of the push rod member 33, but is not limited thereto.

[0117] It should be noted that when the coil 44 is energized, the static iron core 42 attracts the moving iron core 41 to move upward, and the moving iron core 41 can drive the push rod member 33 to move upward. When the moving contact piece 31 contacts the static contact 22, the moving contact piece 31 is blocked by the static contact 22, while the push rod member 33 will still continue to move upward until the over-travel is completed.

[0118] During the over-travel process, the first elastic member 32 can provide an elastic force to the moving contact piece 31 after being extruded by the push rod member 33 to provide contact pressure.

[0119] As Figure 1 shown, the arc extinguishing part 26 includes a permanent magnet 262, and the permanent magnet 262 is arranged on the outer side surface of the insulating cover 21. By arranging the permanent magnet 262 on the outer periphery of the insulating cover 21, a magnetic field can be formed around the static contact 22 and the moving contact piece 31. Therefore, through the action of the magnetic field, the arc generated between the static contact 22 and the static contact 22 will be elongated in the direction away from each other to achieve arc extinguishing.

[0120] The arc extinguishing part 26 further includes a yoke iron clamp 261, and the permanent magnet 262 is arranged between the surface of the yoke iron clamp 261 facing the insulating cover 21 and the outer peripheral surface of the insulating cover 21. Through the design of surrounding the permanent magnet 262 by the yoke iron clamp 261, the magnetic field generated by the permanent magnet 262 can be prevented from diffusing outward and affecting the arc extinguishing effect.

[0121] In one embodiment, the yoke iron clamp 261 is made of soft magnetic material, and the soft magnetic material can include but is not limited to iron, cobalt, nickel, and their alloys, etc.

[0122] It can be understood that the number of yoke clamps 261 can be one or two. When the number of yoke clamps 261 is one, the yoke clamp 261 forms an annular structure surrounding the outer periphery of the insulating cover 21. When the number of yoke clamps 261 is two, each yoke clamp 261 can be U-shaped and arranged oppositely along the first direction D1, and the two yoke clamps 261 respectively surround both ends of the insulating cover 21 along the first direction D1.

[0123] As Figures 2 to 4 shown, the relay of the embodiment of the present application includes a packaging cavity 20 and a valve assembly 60. Among them, the packaging cavity 20 includes an insulating cover 21, a frame piece 24, a yoke iron plate 25 and a metal cover 27, and is used for packaging components such as a moving assembly 30, a static iron core 42, a moving iron core 41, and a second elastic member 46. An inner cavity 20a is formed inside the packaging cavity 20, and the inner cavity 20a includes a first cavity 212 and a second cavity 271. The cavity wall of the inner cavity 20a has a pressure relief hole 28 communicating with the inner cavity 20a.

[0124] It can be understood that in one embodiment, the inner cavity 20a is a completely sealed chamber (that is, the inside of the packaging cavity 20 is not connected to the external space); in another embodiment, the inner cavity 20a may not be a completely sealed chamber.

[0125] As Figure 3 and Figure 4 shown, the valve assembly 60 includes a valve piece 61 having a bursting portion 611 and a connecting portion 612. The connecting portion 612 surrounds and connects to the outer peripheral edge of the bursting portion 611 and is connected to the cavity wall of the inner cavity 20a; the structural strength of the bursting portion 611 is less than that of the connecting portion 612. The valve assembly 60 is configured to close the pressure relief hole 28 when the gas pressure in the inner cavity 20a is less than a threshold value, and the bursting portion 611 ruptures to open the pressure relief hole 28 when the gas pressure in the inner cavity 20a is greater than or equal to the threshold value.

[0126] It can be understood that when the relay is in a normal working state, the gas pressure intensity in the inner cavity 20a is less than the threshold value. At this time, the bursting portion 611 is not broken by the air pressure in the inner cavity 20a, and the valve assembly 60 maintains the state of closing the pressure relief hole 28. When the relay is in an abnormal working state, the gas pressure intensity in the inner cavity 20a is greater than or equal to the threshold value. At this time, the bursting portion 611 is broken by the gas pressure in the inner cavity 20a, and the gas pressure in the inner cavity 20a can be discharged to the inside of the housing 10 through the pressure relief hole 28 and finally discharged to the outside of the housing 10.

[0127] That is to say, in the abnormal working state, during the gradual increase of the gas pressure intensity in the inner cavity 20a, the gas pressure will first break through the bursting part 611, and then the rapidly increasing gas pressure will be released through the pressure relief hole 28, so that the air pressure inside the inner cavity 20a will not continue to rise, and will not reach the structural strength of the encapsulation cavity 20, thus avoiding the explosion of the encapsulation cavity 20. In the normal working state, the gas pressure in the inner cavity 20a will not break through the bursting part 611, and the valve assembly 60 can still play a role in sealing the pressure relief hole 28.

[0128] It can be seen from this that the ultimate structural strength of the bursting part 611 is greater than the upper limit of the structural strength of the encapsulation cavity 20 in normal operation and less than the ultimate structural strength of the encapsulation cavity 20.

[0129] It can be understood that the term "normal working state" refers to the current of the relay being in the rated working condition, and the term "abnormal working state" refers to the moment when the moving contact piece 31 and the static contact 22 are in a large-current short circuit, or moments such as overload breaking. In addition, the pressure represented by the term "threshold value" is slightly greater than the gas pressure intensity in the inner cavity 20a of the relay in the normal working state. According to the different relay models, the threshold value is also adjusted accordingly, but it cannot be greater than the structural strength of the inner cavity 20a.

[0130] That is to say, when the relay is in the normal working state, the pressure in the inner cavity 20a will not reach this threshold value, and at this time the bursting part 611 will not be broken through. When the relay is in the abnormal working state, the pressure in the inner cavity 20a is greater than or equal to this threshold value, and the bursting part 611 can be broken through by the gas.

[0131] It can be understood that when the valve assembly 60 closes the pressure relief hole 28, it can maintain the airtightness of the inner cavity 20a and ensure the normal operation of the relay.

[0132] In an embodiment, the structural strength of the bursting part 611 is less than the structural strength of the encapsulation cavity 20. In this way, when the relay is in the abnormal working state and the gas pressure in the encapsulation cavity 20 gradually increases, the bursting part 611 will burst prior to the encapsulation cavity 20, so as to achieve the purpose of pressure relief.

[0133] Among them, the structural strength of the bursting part 611 is less than that of the encapsulation cavity 20, which can be achieved by different materials and / or structures of the two. For example, in one embodiment, when the materials of the bursting part 611 and the encapsulation cavity 20 are the same, the thickness of the bursting part 611 can be designed to be thinner and less than the wall thickness of the encapsulation cavity 20; in another embodiment, when the wall thicknesses of the bursting part 611 and the encapsulation cavity 20 are the same, the bursting part 611 can be made of ceramic material, while the encapsulation cavity 20 can be made of metal material. Of course, other suitable combinations can also be used to make the structural strength of the bursting part 611 less than that of the encapsulation cavity 20, which will not be listed one by one here.

[0134] For the valve sheet 61 of the embodiment of the present application, the connecting part 612 is connected around the outer periphery of the bursting part 611, and the structural strength of the connecting part 612 is greater than that of the bursting part 611. On the one hand, the structural strength of the bursting part 611 is relatively low, and it can be quickly broken by the gas in the inner cavity 20a to discharge the gas in time; on the other hand, the structural strength of the connecting part 612 is relatively high. When the connecting part 612 is connected to the encapsulation cavity 20, the stress-bearing capacity of the connecting part 612 is improved, thereby avoiding the bursting part 611 from cracking due to the transfer of welding stress to the bursting part 611.

[0135] As Figure 3 and Figure 4 shown, the valve sheet 61 is a sheet structure. For example, the valve sheet 61 can be a circular sheet structure, a rectangular sheet structure, an oval sheet structure, an elliptical sheet structure, etc. Among them, the thickness t1 of the bursting part 611 is less than the thickness t2 of the connecting part 612. In other words, in the embodiment of the present application, by controlling the thickness of the bursting part 611 to be less than the thickness of the connecting part 612, the structural strength of the bursting part 611 is made less than that of the connecting part 612.

[0136] Of course, in other embodiments, the materials of the bursting part 611 and the connecting part 612 can also be designed to be different to achieve different structural strengths. For example, the bursting part 611 is made of ceramic material and the connecting part 612 is made of metal material.

[0137] As Figure 4 shown, in one embodiment, the connecting part 612 and the bursting part 611 are an integral structure. Among them, the valve sheet 61 can be made of materials such as ceramics and glass. The brittleness of ceramics and glass materials is greater, and the bursting part 611 is more likely to be broken by gas, thereby discharging the gas in time.

[0138] Of course, in other embodiments, the connecting part 612 and the bursting part 611 can also be a split structure.

[0139] In the thickness direction of the connecting portion 612, there are a first surface 6121 and a second surface 6122 arranged opposite to each other. In the thickness direction of the bursting portion 611, there are a third surface 6111 and a fourth surface 6112 arranged opposite to each other; the third surface 6111 is flush with the first surface 6121, the fourth surface 6112 is located within the space enclosed by the connecting portion 612, and the second surface 6122 is connected to the wall of the inner cavity 20a.

[0140] In one embodiment, the connecting portion 612 is welded to the encapsulation cavity 20.

[0141] As Figure 5 shown, the similarities between the second embodiment and the first embodiment of the present application will not be described in detail. The differences are as follows:

[0142] A transition portion 615 is formed at the connection position between the inner peripheral surface of the connecting portion 612 and one side surface (the fourth surface 6112) in the thickness direction of the bursting portion 611.

[0143] It can be understood that by providing the transition portion 615 at the connection position between the connecting portion 612 and the bursting portion 611, the influence of stress concentration can be further reduced, and the bursting portion 611 can be prevented from cracking.

[0144] In one embodiment, the transition portion 615 is a chamfer.

[0145] As Figure 6 shown, the similarities between the third embodiment and the second embodiment of the present application will not be described in detail. The differences are as follows: the transition portion 615 is an inner arc angle.

[0146] Of course, in other embodiments, the transition portion 615 can also be a combination of a chamfer and an inner arc angle.

[0147] As Figure 7 shown, the similarities between the fourth embodiment and the first embodiment of the present application will not be described in detail. The differences are as follows:

[0148] The connecting portion 612 and the bursting portion 611 are of a split structure. In one embodiment, the connecting portion 612 and the bursting portion 611 can be connected by means such as welding and bonding. The present application does not limit this.

[0149] Among them, the connecting portion 612 and the bursting portion 611 can be made of the same material or different materials.

[0150] It can be understood that the transition portion 615 can also be provided on the valve plate 61 in the fourth embodiment, which will not be elaborated here.

[0151] As Figure 8 shown, the similarities between the fifth embodiment and the first embodiment of the present application will not be described in detail. The differences are as follows:

[0152] The valve plate 61 includes a flat plate 613 and a connecting ring 614 which are in a split structure. The flat plate 613 covers one surface of the connecting ring 614 in the thickness direction, and the outer peripheral surface of the connecting ring 614 is flush with the outer peripheral edge of the flat plate 613. By designing the outer peripheral surface of the connecting ring 614 to be flush with the outer peripheral edge of the flat plate 613, the force on the valve plate 61 can be made more uniform.

[0153] Of course, in other embodiments, the outer peripheral surface of the connecting ring 614 and the outer peripheral edge of the flat plate 613 may not be flush.

[0154] Among them, the flat plate 613 includes a middle part 6131 and an edge part 6132, and the middle part 6131 and the edge part 6132 are of an integral structure. The edge part 6132 is annular and is connected around the outer peripheral edge of the middle part 6131. The edge part 6132 and the connecting ring 614 are stacked.

[0155] The connecting ring 614 and the edge part 6132 form a connecting part 612, and the middle part 6131 forms a bursting part 611. That is to say, in the embodiment of the present application, the thickness of the connecting part 612 is equal to the sum of the thicknesses of the connecting ring 614 and the edge part 6132.

[0156] It can be understood that the flat plate 613 and the connecting ring 614 can be made of the same material or different materials.

[0157] In addition, the thickness of the connecting ring 614 can be greater than the thickness of the flat plate 613 or less than the thickness of the flat plate 613. When the thickness of the connecting ring 614 is less than the thickness of the flat plate 613, since the sum of the thicknesses of the connecting ring 614 and the edge part 6132 is greater than the thickness of the middle part 6131, it still satisfies that the thickness of the connecting part 612 of the valve plate 61 is greater than the thickness of the bursting part 611.

[0158] As Figure 9 shown, the similarities between the sixth embodiment and the fifth embodiment of the present application will not be described in detail, and the differences are as follows:

[0159] A transition part 615 is formed at the connection position between the inner peripheral surface of the connecting ring 614 and the surface (the fourth surface 6112) of the flat plate 613 facing the connecting ring 614.

[0160] It can be understood that by providing the transition part 615, the influence of stress concentration can be further reduced, and the bursting part 611 can be prevented from cracking.

[0161] In one embodiment, the transition part 615 is a chamfer.

[0162] It should be noted that since the flat piece 613 and the connecting ring 614 are of a split structure, the flat piece 613 and the connecting ring 614 can be connected by welding or glue bonding, so the transition part 615 can be formed by stacking solder or glue.

[0163] As Figure 10 shown, the similarities between the seventh embodiment and the sixth embodiment of the present application will not be described in detail. The differences are as follows: the transition part 615 is an inner arc angle.

[0164] Of course, in other embodiments, the transition part 615 can also be a combination of a chamfer and an inner arc angle.

[0165] As Figure 11 shown, the similarities between the eighth embodiment and the fifth embodiment of the present application will not be described in detail. The differences are as follows:

[0166] The valve piece 61 includes a flat piece 613 and two connecting rings 614 which are of a split structure. The two connecting rings 614 are respectively connected to the two side surfaces in the thickness direction of the flat piece 613, and the outer peripheral surface of each connecting ring 614 is flush with the outer peripheral edge of the flat piece 613. By designing the outer peripheral surface of each connecting ring 614 to be flush with the outer peripheral edge of the flat piece 613, the force on the valve piece 61 can be made more uniform.

[0167] Of course, in other embodiments, the outer peripheral surface of the connecting ring 614 and the outer peripheral edge of the flat piece 613 may not be flush.

[0168] Among them, the flat piece 613 includes an intermediate part 6131 and an edge part 6132, and the intermediate part 6131 and the edge part 6132 are of an integral structure. The edge part 6132 is annular and is connected around the outer peripheral edge of the intermediate part 6131. The edge part 6132 is clamped between the two connecting rings 614.

[0169] The two connecting rings 614 and the edge part 6132 form a connecting part 612, and the intermediate part 6131 forms a bursting part 611. That is to say, in the embodiments of the present application, the thickness of the connecting part 612 is equal to the sum of the thicknesses of the two connecting rings 614 and the edge part 6132.

[0170] It can be understood that the valve piece 61 of the eighth embodiment can also be provided with a transition part 615, and the transition part 615 can be formed by stacking solder or glue, which will not be elaborated here.

[0171] As Figure 12 shown, the similarities between the ninth embodiment and the first embodiment of the present application will not be described in detail. The differences are as follows:

[0172] The third surface 6111 is lower than the first surface 6121, and the fourth surface 6112 is lower than the second surface 6122.

[0173] It can be understood that a transition portion 615 may also be provided on the valve plate 61 of the ninth embodiment, which will not be elaborated here.

[0174] As Figure 13 shown, the similarities between the tenth embodiment of the present application and the third embodiment will not be described again. The differences are as follows:

[0175] A chamfer 616 is formed at the connection between the first surface 6121 of the connecting portion 612 and the outer peripheral surface of the connecting portion 612; and / or, a chamfer 616 is formed at the connection between the second surface 6122 of the connecting portion 612 and the outer peripheral surface of the connecting portion 612; and / or, a chamfer 616 is formed at the connection between the inner peripheral surface of the connecting portion 612 and the second surface 6122 of the connecting portion 612.

[0176] It can be understood that by providing the chamfer 616 at the above-mentioned connection, the burrs at the sharp corners of the valve plate 61 can be removed, thereby facilitating the assembly of the valve plate 61.

[0177] As Figure 14 shown, the similarities between the eleventh embodiment of the present application and the first embodiment will not be described again. The differences are as follows:

[0178] The valve assembly 60 includes a plurality of valve plates 61 stacked on top of each other, and each valve plate 61 is the valve plate 61 of the first embodiment. Among adjacent two valve plates 61, the adjacent two connecting portions 612 are connected, and the adjacent two bursting portions 611 are arranged at intervals in the thickness direction of the valve plate 61. Among them, the adjacent two connecting portions 612 can be connected by welding, glue bonding, etc., and the present application does not make special limitations on this.

[0179] In the embodiments of the present application, a plurality of valve plates 61 are stacked, and the adjacent bursting portions 611 are arranged at intervals. On the one hand, when the relay is in an abnormal working state, the plurality of bursting portions 611 burst and release pressure in sequence; on the other hand, when the relay is in a normal working state, the probability that the plurality of bursting portions 611 burst simultaneously is much smaller than the probability that only one bursting portion 611 bursts. Therefore, the design of the plurality of bursting portions 611 improves the sealing reliability of the encapsulation cavity 20 in the normal working state.

[0180] As Figure 15 shown, the similarities between the twelfth embodiment of the present application and the eleventh embodiment will not be described again. The differences are as follows:

[0181] Each valve plate 61 is the valve plate 61 of the fifth embodiment.

[0182] As Figure 16 shown, the similarities between the thirteenth embodiment of the present application and the eleventh embodiment will not be described again. The differences are as follows:

[0183] Each valve plate 61 is the valve plate 61 of the fourth embodiment.

[0184] As Figure 17 shown, the similarities between the fourteenth embodiment and the eleventh embodiment of the present application will not be described again. The differences are as follows:

[0185] Each valve plate 61 is the valve plate 61 of the ninth embodiment.

[0186] As Figure 18 shown, the similarities between the fifteenth embodiment and the eleventh embodiment of the present application will not be described again. The differences are as follows:

[0187] Each valve plate 61 is the valve plate 61 of the eighth embodiment.

[0188] As Figure 19 shown, the similarities between the sixteenth embodiment and the eleventh embodiment of the present application will not be described again. The differences are as follows:

[0189] The valve assembly 60 includes two valve plates 61. One of the valve plates 61 is the valve plate 61 of the first embodiment, and the other valve plate 61 is the valve plate 61 of the fifth embodiment.

[0190] It can be understood that when the valve assembly 60 includes multiple valve plates 61, each valve plate 61 can be selected from any one of the first to tenth embodiments, and will not be listed one by one here.

[0191] It can be understood that at least one pressure relief hole 28 can be provided in any one of the insulating cover 21, the frame piece 24, the yoke iron plate 25, and the metal cover 27. Next, the setting of the pressure relief hole 28 in the insulating cover 21, the setting of the pressure relief hole 28 in the frame piece 24, the setting of the pressure relief hole 28 in the yoke iron plate 25, and the setting of the pressure relief hole 28 in the metal cover 27 will be described with reference to the accompanying drawings respectively.

[0192] As Figure 20 shown, a pressure relief hole 28 is provided in the top wall 213 of the insulating cover 21, and the pressure relief hole 28 penetrates the top wall 213 along the thickness direction of the top wall 213. The valve assembly 60 is connected to the outer wall surface of the top wall 213 for closing the pressure relief hole 28.

[0193] It can be understood that in the embodiments of the present application, the valve assembly 60 can include the valve plate 61 of any of the above embodiments.

[0194] As Figure 21 and Figure 22 shown, as a variant embodiment, the pressure relief hole 28 can be provided in the side wall 214 of the insulating cover 21. The valve assembly 60 is connected to the outer wall surface of the side wall 214.

[0195] In one embodiment, the side wall 214 may include two first side walls 2141 and two second side walls 2142. The two first side walls 2141 are oppositely arranged along the first direction D1, and the two second side walls 2142 are oppositely arranged along the third direction D3. The two first side walls 2141 and the two second side walls 2142 are sequentially connected end to end to form an annular structure.

[0196] Wherein, the first side wall 2141 and / or the second side wall 2142 may be provided with a pressure relief hole 28.

[0197] It can be understood that in the embodiments of the present application, the valve assembly 60 may include the valve plate 61 of any of the above embodiments.

[0198] As Figure 23 shown, as a variant embodiment, the pressure relief hole 28 may be provided in the frame plate 24, and the valve assembly 60 is connected to the frame plate 24. It can be understood that in the embodiments of the present application, the valve assembly 60 may include the valve plate 61 of any of the above embodiments.

[0199] As Figures 24 to 26 shown, as a variant embodiment, the pressure relief hole 28 may be provided in the yoke iron plate 25, and the pressure relief hole 28 penetrates the yoke iron plate 25 along the thickness direction of the yoke iron plate 25. The valve assembly 60 is connected to the yoke iron plate 25.

[0200] Further, one side surface in the thickness direction of the yoke iron plate 25 has a sunken groove 29, and the pressure relief hole 28 penetrates the bottom surface of the sunken groove 29; at least part of the valve assembly 60 is located in the sunken groove 29.

[0201] It can be understood that in the embodiments of the present application, the valve assembly 60 may include the valve plate 61 of any of the above embodiments.

[0202] As Figure 27 shown, as a variant embodiment, the bottom plate of the metal cover 27 may be provided with a pressure relief hole 28, and the valve assembly 60 is connected to the inner surface of the metal cover 27. It can be understood that in the embodiments of the present application, the valve assembly 60 may include the valve plate 61 of any of the above embodiments.

[0203] As Figure 28 shown, as a variant embodiment, the valve assembly 60 may also be connected to the outer surface of the metal cover 27. It can be understood that in the embodiments of the present application, the valve assembly 60 may include the valve plate 61 of any of the above embodiments.

[0204] As Figure 29 shown, the valve assembly 60 further includes an adapter ring 62, and the connecting portion 612 is connected to the outer wall surface of the top wall 213 through the adapter ring 62. It can be understood that the adapter ring 62 and the insulating cover 21, and between the connecting portions 612 of the valve plate 61 can be connected by laser welding, brazing, resistance welding, gluing and other methods.

[0205] In the embodiment of the present application, the adapter ring 62 is in a sheet shape. One surface on the thickness direction side of the adapter ring 62 is connected to the outer wall surface of the top wall 213, and the other surface on the thickness direction side of the adapter ring 62 is connected to one surface on the thickness direction side of the connecting portion 612.

[0206] Among them, the adapter ring 62 and the connecting portion 612 can be made of the same material or different materials. When the adapter ring 62 and the connecting portion 612 are made of different materials and are connected by welding, the structural strength of the adapter ring 62 is less than that of the connecting portion 612. By designing the structural strength of the adapter ring 62 to be less than that of the connecting portion 612, it is possible to avoid the rupture of the bursting portion 611 caused by the welding stress being transmitted to the valve sheet 61.

[0207] In one embodiment, the adapter ring 62 is made of a metal material, and the connecting portion 612 is made of a ceramic material, but it is not limited thereto.

[0208] It can be understood that in the embodiment of the present application, the valve assembly 60 can include the valve sheet 61 of any of the above embodiments.

[0209] As Figure 30 shown, as a modified embodiment, the adapter ring 62 includes a vertical section 621, an extension section 622, and a bending section 623. The vertical section 621 is connected to the extension section 622 through the bending section 623, and the extension section 622 extends out of the outer peripheral surface of the vertical section 621. The vertical section 621 is perpendicular to the extension section 622.

[0210] The vertical section 621 is connected to one surface on the thickness direction side of the connecting portion 612, and the extension section 622 is connected to the outer wall surface of the top wall 213.

[0211] It can be understood that in the embodiment of the present application, the valve assembly 60 can include the valve sheet 61 of any of the above embodiments.

[0212] As Figure 31 shown, as a modified embodiment, the extension section 622 is connected to one surface on the thickness direction side of the connecting portion 612, and the vertical section 621 is connected to the outer wall surface of the top wall 213.

[0213] It can be understood that in the embodiment of the present application, the valve assembly 60 can include the valve sheet 61 of any of the above embodiments.

[0214] As Figure 32 shown, as a modified embodiment, the adapter ring 62 is in a cylindrical shape. One end of the cylindrical shape is connected to one surface on the thickness direction side of the connecting portion 612, and the other end is connected to the outer wall surface of the top wall 213.

[0215] As Figure 33As shown, as a modified embodiment, the valve plate 61 can also be connected to the yoke iron plate 25 through the adapter ring 62. Among them, the valve plate 61 can be the valve plate 61 of any of the above embodiments, and the adapter ring 62 can be the adapter ring 62 of any of the above embodiments.

[0216] As Figure 34 shown, as a modified embodiment, the valve plate 61 can also be connected to the metal cover 27 through the adapter ring 62. Among them, the valve plate 61 and the adapter ring 62 can be located on the side where the inner surface of the metal cover 27 is located, or can be located on the side where the outer surface of the metal cover 27 is located. In addition, the valve plate 61 can be the valve plate 61 of any of the above embodiments, and the adapter ring 62 can be the adapter ring 62 of any of the above embodiments.

[0217] As Figure 35 shown, the cavity wall of the inner cavity 20a has a plurality of pressure relief holes 28, and the relay includes a plurality of valve assemblies 60. The positions of the plurality of valve assemblies 60 correspond to the positions of the plurality of pressure relief holes 28 for closing the plurality of pressure relief holes 28.

[0218] In the embodiment of the present application, a plurality of pressure relief holes 28 are provided on the cavity wall of the inner cavity 20a, so that the discharge amount can be increased to quickly discharge the high-pressure gas. In addition, since the number of the pressure relief holes 28 is plural, on the premise that the overall discharge amount remains unchanged, the area of each pressure relief hole 28 can be set to be smaller, and thus the setting position of each pressure relief hole 28 is more flexible. For example, some of the pressure relief holes 28 can be opened on the insulating cover 21, and the rest can be opened on the yoke iron plate 25, etc.

[0219] Please continue to refer to Figure 35 , a plurality of pressure relief holes 28 can all be opened on the top wall 213 of the insulating cover 21.

[0220] As Figure 36 shown, as a modified embodiment, a plurality of pressure relief holes 28 can all be opened on the side wall 214 of the insulating cover 21. For example, the number of the pressure relief holes 28 is two. In one embodiment, the two pressure relief holes 28 are respectively opened on two first side walls 2141; in another embodiment, the two pressure relief holes 28 are respectively opened on two second side walls 2142; in still another embodiment, one of the pressure relief holes 28 is opened on one first side wall 2141, and the other pressure relief hole 28 is opened on one second side wall 2142.

[0221] As Figure 37 shown, as a modified embodiment, a plurality of pressure relief holes 28 can all be opened on the frame piece 24.

[0222] As Figure 38 shown, as a modified embodiment, a plurality of pressure relief holes 28 can all be opened on the bottom plate of the metal cover 27. Among them, the valve assembly 60 can be located on the side where the inner surface of the metal cover 27 is located, or can be located on the side where the outer surface of the metal cover 27 is located.

[0223] Figure 39 and Figure 40 As shown, in a modified embodiment, a plurality of pressure relief holes 28 may be formed in the yoke iron plate 25.

[0224] It can be understood that, as Figure 40 shown, in the embodiment where a plurality of pressure relief holes 28 are provided on the wall of the inner cavity 20a, the thicknesses of the bursting parts 611 in the plurality of valve assemblies 60 are not equal.

[0225] In the embodiment of the present application, the thicknesses of the bursting parts 611 of the plurality of valve assemblies 60 are not equal, so that the thinner bursting part 611 ruptures first and the thicker bursting part 611 ruptures later. In this way, the high-pressure gas can be discharged into the chamber surrounded by the outer shell 10 in sequence and orderly, avoiding the problem that the outer shell 10 cracks due to the concentrated discharge of the plurality of pressure relief holes 28 into the outer shell 10 and the outer shell 10 being unable to discharge the gas in time.

[0226] Among them, the fact that the thicknesses of the bursting parts 611 in the plurality of valve assemblies 60 are not equal should be understood as: the thicknesses of the bursting parts 611 of the plurality of valve assemblies 60 are all not equal; or, among the bursting parts 611 of the plurality of valve assemblies 60, at least one bursting part 611 has a thickness different from that of the other bursting parts 611. For example, taking the bursting parts 611 of three valve assemblies 60 as an example, the thickness of the bursting part 611 of one valve assembly 60 is less than the thicknesses of the bursting parts 611 of the other two valve assemblies 60, and the thicknesses of the bursting parts 611 of the other two valve assemblies 60 are equal.

[0227] It should be noted that in the above embodiment where the encapsulation cavity 20 is connected with a plurality of valve assemblies 60, the valve plate 61 included in the valve assembly 60 may be the valve plate 61 in any of the above embodiments.

[0228] In addition, the valve plate 61 may be directly connected to the encapsulation cavity 20. For example, the valve plate 61 is directly connected to the insulating cover 21, the valve plate 61 is directly connected to the yoke iron plate 25, the valve plate 61 is directly connected to the metal cover 27, etc.

[0229] Of course, the valve plate 61 may also be connected to the encapsulation cavity 20 through an adapter ring 62. Among them, the adapter ring 62 may be in the shape of any of the above embodiments, which will not be elaborated here.

[0230] In summary, the relay of the embodiment of the present application has at least the following advantages and beneficial effects:

[0231] In the relay according to the embodiment of the present application, the connecting portion 612 is wound around the outer periphery of the blasting portion 611, and the thickness of the connecting portion 612 is greater than that of the blasting portion 611. On the one hand, the relatively thin blasting portion 611 has a lower structural strength and can be quickly broken by the gas in the inner cavity 20a to release the gas in time. On the other hand, the relatively thick connecting portion 612 has a higher structural strength. When the connecting portion 612 is connected to the encapsulation cavity 20, the stress-bearing capacity of the connecting portion 612 is improved, thereby avoiding the rupture of the blasting portion 611 caused by the transfer of welding stress to the blasting portion 611.

[0232] Further, a plurality of valve sheets 61 are stacked, and the adjacent blasting portions 611 are arranged at intervals. On the one hand, when the relay is in an abnormal working state, the plurality of blasting portions 611 are sequentially broken to release pressure. On the other hand, when the relay is in a normal working state, the probability that the plurality of blasting portions 611 break simultaneously is much smaller than the probability that only one blasting portion 611 breaks. Therefore, the design of the plurality of blasting portions 611 improves the sealing reliability of the encapsulation cavity 20 in the normal working state. On the other hand, the adjacent blasting portions 611 are arranged at intervals, so that the thickness of each blasting portion 611 does not increase, ensuring that the blasting portion 611 can be broken in time to release pressure when the gas pressure in the inner cavity 20a reaches the threshold value.

[0233] Further, a plurality of pressure relief holes 28 are provided on the cavity wall of the inner cavity 20a, which can increase the discharge amount and improve the explosion resistance performance of the relay. In addition, on the premise that the overall discharge amount remains unchanged, the area of each pressure relief hole 28 can be set to be smaller, so that the setting position of each pressure relief hole 28 is more flexible.

[0234] Further, the thicknesses of the blasting portions 611 of the plurality of valve assemblies 60 are not equal, so that the relatively thin blasting portion 611 breaks first and the relatively thick blasting portion 611 breaks later. In this way, the high-pressure gas can be discharged into the chamber surrounded by the housing 10 in an orderly manner, avoiding the problem that the high-pressure gas is concentratedly discharged from a plurality of pressure relief holes 28 into the housing 10 at the same time and the housing 10 cannot discharge the high-pressure gas in time, resulting in the cracking of the housing 10.

[0235] It can be understood that the various embodiments / embodiment modes provided in the present application can be combined with each other without contradiction, and no further examples will be given here.

[0236] In the application embodiments, the terms "first", "second", and "third" are used only for descriptive purposes and should not be construed as indicating or implying relative importance; the term "plural" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to specific circumstances.

[0237] In the description of the application embodiments, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application 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 orientation. Therefore, it should not be construed as a limitation on the application embodiments.

[0238] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application embodiments. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0239] The above are only the preferred embodiments of the application embodiments and are not used to limit the application embodiments. For those skilled in the art, the application embodiments can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. A relay, characterized in that: include: The packaging cavity has an inner cavity formed therein, and the cavity wall of the inner cavity has a pressure relief hole communicated with the inner cavity; as well as A valve assembly includes a valve plate having a bursting portion and a connecting portion, wherein the connecting portion is connected to the outer periphery of the bursting portion and is connected to the cavity wall of the inner cavity, and the structural strength of the bursting portion is 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 inner cavity is greater than or equal to a threshold value.

2. The relay according to claim 1, characterized in that: The valve assembly further comprises an adapter ring, and the connecting portion is connected to the cavity wall of the inner cavity via the adapter ring.

3. The relay according to claim 2, characterized in that: One end of the adapter ring is connected to the surface of the connecting portion in the thickness direction, and the other end is connected to the cavity wall of the inner cavity.

4. The relay according to claim 3, characterized in that: The adapter ring comprises a vertical section and an extension section, wherein the extension section extends out from the outer peripheral surface of the vertical section; One of the vertical section and the extension section is connected to the connection portion, and the other is connected to the cavity wall of the inner cavity.

5. The relay according to claim 4, characterized in that: The adapter ring further includes a curved section, and the vertical section is connected to the extension section via the curved section.

6. The relay according to claim 4, characterized in that: The vertical section is perpendicular to the extension section.

7. The relay according to claim 2, characterized in that: The adapter ring and the connecting portion are made of different materials and are connected by welding; The structural strength of the adapter ring is smaller than the structural strength of the connecting portion.

8. The relay according to any one of claims 1 to 7, characterized in that: The blasting part and the connecting part are an integral structure or a separate structure.

9. The relay according to any one of claims 1 to 7, characterized in that: The valve plate comprises a flat plate and a connecting ring in a split structure, wherein the flat plate covers one side surface of the connecting ring in the thickness direction, and the outer peripheral surface of the connecting ring is flush with the outer peripheral edge of the flat plate; The connecting ring and the portion of the flat sheet connected to the connecting ring constitute the connecting portion, and the remaining portion of the flat sheet constitutes the blasting portion.

10. The relay according to any one of claims 1 to 7, characterized in that: The valve plate comprises a split flat plate and two connecting rings, the two connecting rings are respectively connected to the two side surfaces of the flat plate in the thickness direction, and the outer peripheral surface of each connecting ring is flush with the outer peripheral edge of the flat plate; The two connecting rings and the portion of the flat sheet connected to the connecting rings constitute the connecting portion, and the remaining portion of the flat sheet constitutes the blasting portion.

11. The relay according to any one of claims 1 to 7, characterized in that: The connecting portion has a first surface and a second surface disposed opposite to each other in the thickness direction, and the bursting portion has a third surface and a fourth surface disposed opposite to each other in the thickness direction; The third surface is flush with the first surface, the fourth surface is located in the space surrounded by the connecting portion, and the second surface is connected to the cavity wall of the inner cavity.

12. The relay according to any one of claims 1 to 7, characterized in that: The connecting portion has a first surface and a second surface disposed opposite to each other in the thickness direction, and the bursting portion has a third surface and a fourth surface disposed opposite to each other in the thickness direction; The third surface is lower than the first surface, and the fourth surface is lower than the second surface.

13. The relay according to any one of claims 1 to 7, characterized in that: The valve assembly includes a plurality of valve sheets arranged in a stacked manner; In two adjacent valve sheets, two adjacent connecting portions are connected, and two adjacent bursting portions are arranged at intervals along the thickness direction of the valve sheet.

14. The relay according to any one of claims 1 to 7, characterized in that: A transition portion is formed at a connection position between the inner peripheral surface of the connection portion and one side surface of the bursting portion in a thickness direction.

15. The relay according to claim 14, characterized in that: The transition portion is any one of the following structures: a chamfer, an inner arc angle, or a combination of a chamfer and an inner arc angle.

16. The relay according to claim 14, characterized in that The connecting part and the blasting part are separate structures and connected by welding or bonding; The transition portion is formed by accumulation of solder or glue.

17. The relay according to any one of claims 1 to 7, characterized in that: The cavity wall of the inner cavity has a plurality of the pressure relief holes, and the relay includes a plurality of valve assemblies, and the positions of the plurality of valve assemblies correspond to the positions of the plurality of the pressure relief holes, and are used to close the plurality of the pressure relief holes.

18. The relay according to claim 17, characterized in that: The thicknesses of the bursting parts in the plurality of valve assemblies are not equal.

19. The relay according to claim 1, characterized in that The packaging cavity comprises: The yoke iron plate has a first through hole, wherein the first through hole penetrates the yoke iron plate along the thickness direction of the yoke iron plate; an insulating cover connected to one side surface of the yoke plate in the thickness direction through a frame sheet to form a first chamber; and A metal cover connected to the other side surface of the yoke iron plate in the thickness direction to form a second chamber; Wherein, the first chamber and the second chamber are connected through the first through-hole to form the inner cavity.

20. The relay according to claim 19, characterized in that The yoke iron plate has the pressure relief hole, and the valve assembly is connected to the yoke iron plate.

21. The relay according to claim 20, characterized in that The yoke iron plate has a sinking groove on one side surface in the thickness direction, and the pressure relief hole penetrates the bottom surface of the sinking groove; At least a portion of the valve assembly is located within the sink.

22. The relay according to claim 19, characterized in that The insulating cover has the pressure relief hole, and the valve assembly is connected to the insulating cover.

23. The relay according to claim 22, characterized in that The insulating cover comprises: a top wall; and The side wall is connected to the outer periphery of the top wall; the top wall and / or the side wall has the pressure relief hole.

24. The relay according to claim 19, characterized in that The frame sheet has the pressure relief hole, and the valve assembly is connected to the frame sheet.

25. The relay according to claim 19, characterized in that The metal cover has the pressure relief hole, and the valve assembly is connected to the inner wall surface or the outer wall surface of the metal cover.

26. The relay according to claim 1, characterized in that The inner cavity is a completely sealed chamber.

27. The relay according to claim 1, characterized in that The valve assembly is configured to close the pressure relief hole when the gas pressure in the inner cavity is less than the threshold value.

28. The relay according to claim 1, characterized in that The structural strength of the bursting part is smaller than the structural strength of the packaging cavity.

29. The relay according to claim 28, characterized in that The material of the bursting part is different from the material of the packaging cavity; and / or the thickness of the bursting part is smaller than the thickness of the cavity wall of the inner cavity.

30. The relay according to claim 1, characterized in that The bursting part is made of ceramic material.

31. The relay according to claim 1, characterized in that The thickness of the bursting part is smaller than the thickness of the connecting part.

32. The relay according to claim 1, characterized in that The connecting portion is welded to the packaging cavity.

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