CN217158051U - Sealed contact unit and electric appliance element - Google Patents

Abstract

The utility model discloses a sealed contact unit and electrical components, sealed contact unit include sealed container, contact subassembly and pressure release valve module. The sealed container is provided with a sealed chamber and a pressure relief hole, and the pressure relief hole penetrates through the wall of the container of the sealed container and is communicated with the sealed chamber; the contact assembly comprises a fixed contact piece and a movable contact piece, wherein the movable contact piece is arranged in the sealed cavity and is configured to move to be in contact with or separated from the fixed contact piece so as to enable the fixed contact piece and the movable contact piece to be in or out of current conduction; the pressure relief valve assembly is arranged on the wall of the container of the sealed container and is used for closing the pressure relief hole when the pressure of gas in the sealed container is less than a threshold value and is broken to open the pressure relief hole when the pressure of gas in the sealed container is greater than or equal to the threshold value.

Description

Sealed contact unit and electric appliance element

Technical Field

The utility model relates to an electron device technical field particularly, relates to a sealed contact unit and electrical components.

Background

Along with the requirement of the mileage of a new energy automobile, the heat loss of the high-voltage direct-current relay is required to be reduced under the normal condition, and the short-circuit resistance current and the voltage of the relay are required to be further increased due to the fact that the capacity of the battery is higher when the battery pack is in short circuit. When the short-circuit load is large, the high-voltage direct-current relay contact can be flicked due to the fact that electric repulsion force is generated by short-circuit current, contact arcing further occurs, and due to the fact that the load short-circuit current and the voltage are high, instantaneous violent arcing between the contacts is caused.

And because the contact resistance reliability of the contact is required to be ensured, a large part of contact systems of the high-voltage direct-current relay are sealed, and some gases such as hydrogen or nitrogen with certain pressure are filled in the contact sealing cavity to assist arc extinction.

However, in the relay in the related art, when the contact system is in a high-current short-circuit moment or an overload disconnection moment, the contact seal chamber is prone to explosion.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a can improve sealed contact unit and electrical components of security to solve the easy explosive problem that exists among the correlation technique.

The utility model discloses sealed contact unit, including sealed container, contact subassembly and pressure relief valve subassembly. The sealed container is provided with a sealed chamber and a pressure relief hole, and the pressure relief hole penetrates through the container wall of the sealed container and is communicated with the sealed chamber; the contact assembly comprises a fixed contact piece and a movable contact piece, wherein the movable contact piece is arranged in the sealed cavity and is configured to move to be in contact with or separated from the fixed contact piece so as to enable the fixed contact piece and the movable contact piece to be in or out of current conduction; the pressure relief valve assembly is arranged on the wall of the container of the sealed container and used for closing the pressure relief hole when the gas pressure in the sealed container is smaller than a threshold value and being broken to open the pressure relief hole when the gas pressure in the sealed container is larger than or equal to the threshold value.

According to the utility model discloses a some embodiments, the relief valve subassembly includes the valve block, the integrative setting of valve block is in the container wall is used for sealing or opening the pressure release hole.

According to some embodiments of the invention, the container wall has an inner wall surface and an outer wall surface, and the valve plate has a third side and a fourth side which are oppositely arranged;

the third side surface is connected with the hole wall of the pressure relief hole, and the fourth side surface is flush with the outer wall surface.

According to the utility model discloses a some embodiments, the relief valve subassembly includes the valve block, the valve block with the container wall components of a whole that can function independently sets up, and sets up the pressure release hole is used for sealing or opening the pressure release hole.

According to some embodiments of the invention, the container wall has an inner wall surface and an outer wall surface, and the valve sheet is disposed on the inner wall surface and/or the outer wall surface.

According to some embodiments of the invention, the pressure relief valve assembly further comprises a transition piece, the valve plate passing through the transition piece connect in the container wall.

According to some embodiments of the invention, the relief valve assembly further comprises a protective cover connected to the container wall and covering the outer surface of the valve plate; the protective cover is provided with a vent hole.

According to some embodiments of the invention, the pressure relief valve assembly has a structural strength less than that of the sealed container.

The utility model discloses electrical element, including above-mentioned arbitrary sealed contact unit.

According to some embodiments of the invention, the electrical component further comprises a housing having a hollow cavity;

and the sealing container and the pressure relief valve assembly of the sealing contact unit are both positioned in the hollow cavity.

According to some embodiments of the invention, the housing comprises:

a first housing;

the second shell is detachably connected with the first shell; and the first shell and/or the second shell are/is provided with an air leakage structure, and the air leakage structure is communicated with the hollow cavity.

According to some embodiments of the present invention, the air leakage structure includes a gap formed between the first housing and the second housing.

According to some embodiments of the invention, the venting structure comprises a venting hole and/or a venting cover and/or a venting grid.

According to some embodiments of the invention, the hollow chamber communicates with the outside of the housing.

According to some embodiments of the invention, the electrical component is a relay.

According to some embodiments of the invention, the sealed container of the sealed contact unit comprises:

the first yoke iron plate comprises a first side surface, a second side surface and a through hole, wherein the first side surface, the second side surface and the through hole are oppositely arranged, and the through hole penetrates through the first side surface and the second side surface;

the insulating cover is connected with the first side surface and covers the through hole; and

the metal cover is connected with the second side surface and covers the through hole;

wherein, insulating cover and/or metal covering is equipped with the pressure release hole.

According to some embodiments of the invention, the pressure relief valve assembly is provided on the insulating boot, the insulating boot includes:

a ceramic cover, the fixed contact being disposed on the ceramic cover;

one end of the connecting piece is connected with the edge of the opening of the ceramic cover, and the other end of the connecting piece is connected with the first side face;

the ceramic cover and/or the connecting piece are/is provided with the pressure relief hole.

According to some embodiments of the invention, the ceramic cover comprises:

a top wall on which the fixed contact is disposed;

one end of the first side wall is connected to the edge of the top wall, and the other end of the first side wall extends towards the first yoke plate and is connected with the connecting piece;

the top wall and/or the first side wall are/is provided with the pressure relief hole.

According to some embodiments of the invention, the pressure relief valve assembly is disposed on the metal cover; the metal cover includes:

a bottom wall;

one end of the second side wall is connected to the edge of the bottom wall, and the other end of the second side wall extends towards the first yoke plate and is connected with the second side face;

the bottom wall is provided with the pressure relief hole.

An embodiment of the above utility model has at least the following advantages or beneficial effects:

the utility model discloses sealed contact unit is through setting up pressure release valve subassembly on sealed container for the overpressure gas of releasing, and then ensure that the contact subassembly is under the unusual operating mode such as short circuit, overload divide absolutely, sealed contact unit can not take place to lead to gaseous sharp inflation to cause the cavity explosion to disintegrate because of the inside high temperature of cavity, has improved the reliability of product.

Additionally, the utility model discloses electrical components's shell design is non-seal structure, both can in time discharge the gas of releasing, can prevent again that the thing that releases from causing the pollution to other electron devices.

Drawings

Fig. 1 shows a plan view of a relay according to an embodiment of the present invention.

Fig. 2 shows a cross-sectional view a-a in fig. 1.

Fig. 3 is an exploded schematic view of a relay according to an embodiment of the present invention.

Fig. 4 is a sectional view of the assembled insulation cover and valve sheet according to the first embodiment of the present invention.

Fig. 5 is a sectional view of the assembled insulation cover and valve sheet according to the second embodiment of the present invention.

Fig. 6 is a sectional view of the third embodiment of the present invention after assembling the insulating cover and the valve sheet.

Fig. 7 is a sectional view of the assembled insulation cover and valve sheet according to the fourth embodiment of the present invention.

Fig. 8 is a sectional view of an assembled insulation cover and valve sheet according to a fifth embodiment of the present invention.

Fig. 9 is a perspective view of the assembled insulation cover and valve sheet according to the sixth embodiment of the present invention.

Fig. 10 is a perspective view showing an assembled insulation cover and valve sheet according to a seventh embodiment of the present invention.

Fig. 11 is a sectional view of an assembled insulation cover and valve sheet according to an eighth embodiment of the present invention.

Fig. 12 shows a partial enlarged view at B in fig. 11.

Fig. 13 is a sectional view of the ninth embodiment of the present invention after the insulating cover and the valve sheet are assembled.

Fig. 14 is a sectional view of the first embodiment of the present invention after the metal cover and the valve sheet are assembled.

Fig. 15 shows a cross-sectional view of the second embodiment of the present invention after the metal cover and valve sheet are assembled.

Fig. 16 is a cross-sectional view of the third embodiment of the present invention after the metal cover and the valve sheet are assembled.

Fig. 17 is a cross-sectional view of the fourth embodiment of the present invention after the metal cover and the valve sheet are assembled.

Fig. 18 is a cross-sectional view of the fifth embodiment of the present invention after the metal cover and the valve sheet are assembled.

Fig. 19 is a sectional view showing a sixth embodiment of the present invention after the metal cover and the valve sheet are assembled.

Fig. 20 is a sectional view showing the seventh embodiment of the present invention after the metal cover and the valve sheet are assembled.

Figure 21 shows a cross-sectional view of the embodiment of the present invention with the protective cover installed in the container wall.

Fig. 22 is an exploded view of a first embodiment of the housing of the present invention.

Fig. 23 shows an exploded view of a second embodiment of the housing of the present invention.

Fig. 24 is an exploded view of a third embodiment of the housing of the present invention.

Fig. 25 shows an exploded view of a fourth embodiment of the housing of the present invention.

Fig. 26 shows an exploded view of a fifth embodiment of the housing of the present invention.

Wherein the reference numerals are as follows:

1. outer casing

11. First shell

12. Second shell

13. Air release structure

131. Gap for gas turbine

132. Air release hole

133. Air release cover

134. Air-release grid

14. Hollow chamber

2. Sealed container

21. Insulating cover

211. Ceramic cover

2111. Roof wall

2112. First side wall

212. Connecting piece

22. First yoke iron plate

221. Pressure relief hole

222. Through hole

223. First side surface

224. Second side surface

23. Metal hood

231. Bottom wall

232. Second side wall

24. Drive chamber

25. Second yoke plate

26. Third yoke plate

27. Contact chamber

281. Inner wall surface

282. Outer wall surface

3. Contact assembly

31. Fixed contact

32. Movable contact

4. Drive assembly

41. Electromagnet unit

411. Coil rack

4111. First flange part

4112. Hollow cylindrical part

4113. Second flange part

412. Coil

413. Static iron core

4131. First through hole

414. Movable iron core

415. First elastic member

416. Magnetic conduction sleeve

42. Push rod unit

421. U-shaped bracket

422. Base seat

423. Push rod

424. Second elastic member

425. First magnetizer

426. Second magnetizer

5. Pressure relief valve assembly

51. Valve plate

511. Third side

512. The fourth side

52. Transition piece

521. Second through hole

522. Flange

53. Protective cover

531. Vent hole

7. Arc extinguishing unit

71. Arc extinguishing magnet

72. Yoke iron frame

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As described in the background art, in the contact system of the relay in the related art, at the moment of a large-current short circuit or the moment of overload disconnection, the contact seal cavity is easy to explode, and potential safety hazards exist. The utility model discloses an inventor discovers in studying because the inside contact of contact seal chamber is violent to be burnt arc for produce high temperature in the twinkling of an eye inside seal chamber, thereby make the atmospheric pressure in the contact seal chamber gather in the twinkling of an eye and rise suddenly, in case the atmospheric pressure intensity in the contact seal chamber this moment > when the intensity of the component part in contact seal chamber or the intensity of junction, the contact seal chamber of relay will explode easily.

The utility model discloses sealed contact unit includes sealed container, contact subassembly and pressure relief valve subassembly. The sealed container is provided with a sealed chamber and a pressure relief hole, and the pressure relief hole penetrates through the wall of the container of the sealed container and is communicated with the sealed chamber; the contact assembly comprises a fixed contact piece and a movable contact piece, wherein the movable contact piece is arranged in the sealed cavity and is configured to move to be in contact with or separated from the fixed contact piece so as to enable the fixed contact piece and the movable contact piece to be in or out of current conduction; the pressure relief valve assembly is arranged on the wall of the container of the sealed container and is used for closing the pressure relief hole when the pressure of gas in the sealed container is less than a threshold value and is broken to open the pressure relief hole when the pressure of gas in the sealed container is greater than or equal to the threshold value.

It should be noted that the sealed contact unit of the present invention can be applied to electrical components that can realize contact or separation, such as, but not limited to, relays, contactors, vacuum interrupters, and the like. For convenience of explanation, the following description will be given by taking an electrical component as an example of a relay, but the present invention is not limited thereto.

As shown in fig. 1 and 2, fig. 1 is a plan view of a relay according to an embodiment of the present invention. Fig. 2 shows a cross-sectional view a-a in fig. 1. The utility model discloses relay, including shell 1, sealed container 2, contact subassembly 3, drive assembly 4 and relief valve assembly 5. The housing 1 has a hollow chamber 14, and the hollow chamber 14 communicates with the outside of the housing 1. The sealed container 2 is arranged in the hollow cavity 14, the sealed container 2 is provided with a sealed cavity and a pressure relief hole 221, and the pressure relief hole 221 penetrates through the wall of the sealed container 2 and is communicated with the hollow cavity 14 and the sealed cavity. The contact assembly 3 includes a fixed contact 31 and a movable contact 32, the fixed contact 31 is disposed on the container wall, and one end of the fixed contact 31 protrudes into the sealed chamber and the other end is exposed to the outer surface of the housing 1. The movable contact 32 is disposed within the sealed chamber. The driving assembly 4 is disposed in the hollow chamber 14 and connected to the movable contact 32 for driving the movable contact 32 to move so as to respectively contact or separate both ends of the movable contact 32 with or from the fixed contact 31. The relief valve assembly 5 is provided on the wall of the container of the hermetic container 2, and is configured to close the relief hole 221 when the gas pressure in the hermetic chamber is less than a threshold value, and to be broken to open the relief hole 221 when the gas pressure in the hermetic chamber is equal to or greater than a threshold value. The structural strength of the pressure relief valve assembly 5 is less than that of the sealed container 2; in a normal working state, the maximum value of the gas pressure intensity in the sealed cavity is smaller than the structural intensity of the pressure relief valve assembly 5; in the abnormal operation state, the maximum value of the gas pressure intensity in the sealed chamber is greater than the structural intensity of the relief valve assembly 5. It can be understood that when the pressure relief valve assembly 5 closes the pressure relief hole 221, the sealing performance of the sealing chamber can be maintained, and the normal operation of the relay is ensured.

The utility model discloses relay through set up a pressure relief valve subassembly 5 on the container wall at sealed container 2 for seal or open pressure relief hole 221. When the contact assembly 3 is in a normal working state, the gas pressure intensity in the sealed cavity is smaller than the threshold value, so that the pressure relief valve assembly 5 is not broken by the gas pressure in the sealed cavity, and the state of closing the pressure relief hole 221 is still maintained, so that the sealed cavity can still keep sealed. When the contact assembly 3 is in an abnormal working state, the gas pressure intensity in the sealed cavity is greater than or equal to the threshold, so that the pressure relief valve assembly 5 is broken by the gas pressure in the sealed cavity, the sealed cavity is communicated with the hollow cavity 14 of the housing 1 through the pressure relief hole 221, and the gas pressure in the sealed cavity can be released to the hollow cavity 14 through the pressure relief hole 221 and finally released to the outside of the housing 1. That is to say, under the abnormal operation state, in the process of the gas pressure intensity in the sealed chamber gradually rising, the gas pressure can burst the pressure relief valve assembly 5 first, and then the gas pressure that sharply rises is released through the pressure relief hole 221, so that the gas pressure in the sealed chamber can not continuously rise, the structural strength of the sealed chamber can not be reached, and the explosion of the sealed chamber can be avoided. Under normal operating conditions, the gas pressure in the sealed chamber does not burst the relief valve assembly 5, and the relief valve assembly 5 can still function to seal the relief hole 221.

It is understood that the term "normal operation state" refers to the current of the relay being in the rated operation state, and the term "abnormal operation state" refers to the contact assembly 3 being in the high-current short-circuit moment or the overload breaking moment. Furthermore, the term "threshold value" represents a pressure that is slightly greater than the pressure of the gas in the sealed container 2 in the normal operating state of the relay. The threshold value is also adapted to the type of relay, but cannot be greater than the structural strength of the sealed container 2.

That is, when the relay is in a normal operating state, the pressure in the sealed container 2 does not reach the threshold value, so that the relief valve assembly 5 is not broken. When the relay is in an abnormal working state, the pressure in the sealed container 2 is greater than or equal to the threshold value, and the pressure relief valve assembly 5 is broken by gas.

In one embodiment, the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the sealed container 2. Thus, when the relay is in an abnormal working state and the pressure of the gas in the sealed container 2 gradually rises, the pressure relief valve assembly 5 is broken by the gas before the sealed container 2.

It will be appreciated that the design in which the structural strength of the pressure relief valve assembly 5 is less than the structural strength of the sealed container 2 may be different by material and/or structure. For example, when the material of the pressure relief valve assembly 5 and the wall of the sealed container 2 are the same, the thickness of the pressure relief valve assembly 5 can be designed to be thinner and smaller than the wall of the sealed container 2, so that the gas with gradually rising temperature can preferentially burst the pressure relief valve assembly 5. Of course, in the case where the thickness of the pressure relief valve assembly 5 and the wall of the sealed container 2 are the same, the pressure relief valve assembly 5 may be made of ceramic, and the sealed container 2 may be made of metal, which may also cause the pressure relief valve assembly 5 to be broken first. Alternatively, the pressure relief valve assembly 5 is made of ceramic and is made of metal, and the wall of the sealed container 2 is made of ceramic. Of course, other suitable means may be used to make the pressure relief valve assembly 5 structurally weaker than the sealed container 2, and are not further described herein.

It is to be understood that the terms "comprises" and "comprising," and any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.

It should be noted that, the relay according to the embodiment of the present invention may not include the housing 1, but the sealed container 2, the contact assembly 3, the driving assembly 4, and the relief valve assembly 5 are directly mounted in an application product, such as a battery pack or an electrical control box, after being assembled.

With continued reference to fig. 1 and 2, the contact assembly 3 includes two fixed contacts 31 for current inflow and current outflow, respectively, and a movable contact 32. The movable contact 32 may be in a shape of a straight piece, and both ends of the movable contact 32 can be respectively contacted with the two fixed contacts 31 under the action of the driving assembly 4 along the length direction of the movable contact 32, so that the fixed contacts 31 and the movable contact 32 realize current conduction. When the fixed contact 31 and the movable contact 32 are separated, the two are electrically disconnected. The bottom of the fixed contact 31 serves as a stationary contact, and both ends of the movable contact 32 in the length direction thereof serve as movable contacts. The movable contacts at both ends of the movable contact 32 may protrude from other portions of the movable contact 32 or may be flush with the other portions.

It is understood that the stationary contact may be integrally or separately provided at the bottom of the fixed contact 31, and the movable contact may be integrally or separately provided at both ends of the movable contact 32 in the extension length direction.

Two fixed contacts 31 are provided on the sealed container 2, for example, at the top of the sealed container 2. And, one end of each fixed contact 31 protrudes into the inside of the sealed chamber, and the other end is exposed to the outer surface of the housing 1. One end of the fixed contact 31 projecting into the sealed chamber is for contact with the movable contact 32.

The relay further comprises an arc extinguishing unit 7, the arc extinguishing unit 7 being arranged in the hollow cavity 14 of the housing 1 for extinguishing an arc of the contact assembly 3.

In the present embodiment, the arc-extinguishing unit 7 includes two arc-extinguishing magnets 71. The quenching magnets 71 may be permanent magnets, and each quenching magnet 71 may have a substantially rectangular parallelepiped shape. The two quenching magnets 71 are provided on both sides of the sealed container 2, respectively, and are arranged to face each other along the longitudinal direction of the movable contact 32.

As shown in fig. 2, two quenching magnets 71 are respectively located on the left and right sides of the sealed container 2. In the present embodiment, the polarities of the facing surfaces of the two quenching magnets 71 are opposite. That is, the arc extinguishing magnet 71 positioned on the left side of the sealed container 2 has an S-pole on the left side and an N-pole on the right side, and the arc extinguishing magnet 71 positioned on the right side of the sealed container 2 has an S-pole on the left side and an N-pole on the right side.

Of course, the polarities of the facing surfaces of the two quenching magnets 71 may be the same, and for example, the left surface of the quenching magnet 71 located on the left side of the insulating cover 21 is an S-pole and the right surface thereof is an N-pole, and the left surface of the quenching magnet 71 located on the right side of the insulating cover 21 is an N-pole and the right surface thereof is an S-pole.

By providing two opposing quenching magnets 71 in this way, a magnetic field can be formed around the contact assembly 3. Therefore, the arc generated between the fixed contactor 31 and the movable contactor 32 is elongated in a direction away from each other by the action of the magnetic field in either direction, and arc extinction is achieved.

The arc extinguishing unit 7 further includes two yoke brackets 72, and the two yoke brackets 72 are disposed corresponding to the positions of the two arc extinguishing magnets 71. Also, two yoke iron frames 72 surround the hermetic container 2 and the two quenching magnets 71. By the design that the yoke iron frame 72 surrounds the arc extinguishing magnet 71, the magnetic field generated by the arc extinguishing magnet 71 can be prevented from diffusing outwards to influence the arc extinguishing effect. The yoke clip 72 is made of a soft magnetic material. Soft magnetic materials may include, but are not limited to, iron, cobalt, nickel, alloys thereof, and the like.

The hermetic container 2 includes a first yoke plate 22, an insulating cover 21, and a metal cover 23, the first yoke plate 22 is disposed in the hollow chamber 14 and includes first and second side surfaces 223 and 224 disposed oppositely and a through hole 222, and the through hole 222 penetrates the first and second side surfaces 223 and 224.

The insulating cover 21 is connected to the first side 223 and covers the through hole 222. The insulating cover 21 and the first yoke plate 22 enclose a contact chamber 27, the contact chamber 27 communicating with the through hole 222, the contact chamber 27 for accommodating the fixed contact 31 and the movable contact 32.

The metal cover 23 is connected to the second side surface 224 and covers the through hole 222. The metal cover 23 and the first yoke plate 22 define a driving chamber 24, the driving chamber 24 is communicated with the through hole 222, and the driving chamber 24 is used for accommodating a static iron core 413 and a movable iron core 414, which will be described in detail below. The contact chamber 27 communicates with the drive chamber 24 through the through hole 222, and the contact chamber 27 and the drive chamber 24 together form the sealed chamber.

The pressure relief valve assembly 5 may be disposed on the insulating cover 21, or may be disposed on the metal cover 23, or the pressure relief valve assembly 5 is disposed on both the insulating cover 21 and the metal cover 23.

The insulating cover 21 may include a ceramic cover 211 and a connection member 212, and the two fixed contacts 31 are disposed on the ceramic cover 211. The ceramic cover 211 is connected to the first yoke plate 22 by a connecting member 212. Specifically, the connecting member 212 may have a ring-shaped structure, and one end of the connecting member 212 is connected to the opening edge of the ceramic cover 211, for example, by laser welding, soldering, resistance welding, gluing, or the like. The other end of the connecting member 212 is connected to the first side 223 of the first yoke plate 22 by laser welding, soldering, resistance welding, gluing, or the like. A connecting member 212 is provided between the ceramic cover 211 and the first yoke plate 22 to facilitate the connection of the ceramic cover 211 and the first yoke plate 22.

With reference to fig. 2, the driving assembly 4 includes an electromagnet unit 41 and a push rod unit 42, wherein the electromagnet unit 41 is disposed on a side of the first yoke plate 22 away from the insulating cover 21 and surrounds the metal cover 23. The plunger unit 42 is in driving connection with the electromagnet unit 41, and the plunger unit 42 is movably disposed in the driving chamber 24 and connected with the movable contact 32 through the through hole 222.

When the electromagnet unit 41 is energized, the push rod unit 42 can be driven to move, and the movable contact piece 32 is driven to move so as to contact with or separate from the fixed contact piece 31.

The electromagnet unit 41 includes a bobbin 411, a coil 412, a stationary core 413, and a movable core 414. The bobbin 411 has a hollow cylindrical shape and is formed of an insulating material. The metal cover 23 is inserted into the bobbin 411. The coil surrounds the bobbin 411. The stationary core 413 is fixedly disposed in the metal cover 23, and a part of the stationary core 413 extends into the through hole 222. The stationary core 413 has a first through hole 4131, and the first through hole 4131 is disposed corresponding to the through hole 222 for the push rod unit 42 to pass through. The movable iron core 414 is movably disposed in the metal cover 23 and opposite to the stationary iron core 413, and the movable iron core 414 is connected to the push rod unit 42 and is attracted by the stationary iron core 413 when the coil is energized. The plunger 414 and the pusher unit 42 may be screwed, riveted, welded, or otherwise connected.

In the present embodiment, the bobbin 411 is made of a resin material, and includes a first flange portion 4111, a hollow cylindrical portion 4112, and a second flange portion 4113, and the first flange portion 4111 and the second flange portion 4113 are respectively disposed at both ends of the hollow cylindrical portion 4112. The outer periphery of the hollow cylindrical portion 4112 surrounds the coil 412. The metal cover 23 is inserted into the hollow cylindrical portion 4112.

The electromagnet unit 41 further includes a first elastic member 415, and the first elastic member 415 is located inside the metal cover 23 and disposed between the stationary core 413 and the movable core 414 for resetting the movable core 414 when the coil is de-energized. The first elastic member 415 may be a compression spring and is sleeved outside the push rod unit 42.

The relay further includes a second yoke plate 25 and a pair of third yoke plates 26. The second yoke plate 25 is disposed opposite to the first yoke plate 22, and the bobbin 411 is interposed between the first yoke plate 22 and the second yoke plate 25, that is, the first yoke plate 22 connects the first flange portion 4111 of the bobbin 411, and the second yoke plate 25 connects the second flange portion 4113 of the bobbin 411.

The pair of third yoke plates 26 are provided at both ends of the second yoke plate 25 in the longitudinal direction of the movable contact 32, extend in the direction of the first yoke plate 22, and are connected to both ends of the first yoke plate 22 in the longitudinal direction of the movable contact 32.

Thus, the first yoke plate 22, the second yoke plate 25 and the pair of third yoke plates 26 surround the coil 412.

It is to be understood that the second yoke plate 25 and the pair of third yoke plates 26 may be a unitary structure, such as by bending. The first yoke plate 22, the second yoke plate 25 and the pair of third yoke plates 26 may be formed integrally as a separate body.

The relay further comprises a magnetically conductive sleeve 416, the magnetically conductive sleeve 416 being made of a soft magnetic material. Soft magnetic materials may include, but are not limited to, iron, cobalt, nickel, alloys thereof, and the like. The magnetic conductive sleeve 416 is provided in a gap formed between the inner peripheral surface of the lower end of the hollow cylindrical portion 4112 of the bobbin 411 and the outer peripheral surface of the metal cover 23, so that the first yoke plate 22, the second yoke plate 25, the pair of third yoke plates 26, the stationary core 413, the movable core 414, and the magnetic conductive sleeve 416 form a magnetic circuit together.

The push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixing plate, a push rod 423, a second elastic member 424, a first magnetic conductor 425, and a second magnetic conductor 426. The first magnetizer 425 is fixedly connected to the U-shaped bracket 421, and the first magnetizer 425 is disposed on an inner side surface of the U-shaped bracket 421. The second magnetizer 426 is fixedly connected to the movable contact 32. The base 422, the fixing piece, and the upper portion of the push rod 423 may be integrally injection-molded.

The bottom of the U-shaped support 421 is fixedly connected to the fixing plate, the U-shaped support 421 and the base 422 enclose a frame structure, and the movable contact member 32, the first magnetizer 425 and the second magnetizer 426 are installed in the frame structure enclosed by the U-shaped support 421 and the base 422. The second elastic member 424 is also disposed in the frame structure surrounded by the U-shaped bracket 421 and the base 422, one end of the second elastic member 424 abuts against the base 422, and the other end of the second elastic member 424 abuts against the movable contact member 32, and the second elastic member 424 can provide an elastic force, so that the movable contact member 32 and the second magnetic conductor 426 have a tendency to move away from the base 422 and approach the first magnetic conductor 425. The pushing rod 423 is disposed through the through hole 222 of the first yoke plate 22 and the first through hole 4131 of the stationary core 413, and one end of the pushing rod 423 is fixedly connected to the base 422 and the other end of the pushing rod 423 is fixedly connected to the movable core 414.

It is understood that the second elastic member 424 may be a compression spring. The first magnetizer 425 and the second magnetizer 426 may be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

When the pushing rod 423 is not moved upward, the top surface of the movable contact 32 abuts against the first magnetizer 425 by the second elastic member 424. When the coil 412 is energized to drive the push rod 423 to move upward, both ends of the movable contact 32 are respectively brought into contact with the two fixed contacts 31. Subsequently, the pushing rod 423 continues to move upward, the first magnetic conductor 425 also continues to move upward along with the pushing rod 423, and the movable contact piece 32 cannot continue to move upward because the movable contact piece 32 is already in contact with the two fixed contact pieces 31, so that the overtravel of the contact is realized. Due to the elastic force provided by the second elastic member 424, a certain gap is formed between the bottom surface of the first magnetic conductor 425 and the top surface of the movable contact member 32, and thus a magnetic gap is also formed between the first magnetic conductor 425 and the second magnetic conductor 426.

As shown in fig. 3, fig. 3 is an exploded schematic view of a relay according to an embodiment of the present invention. In the present embodiment, the relief valve assembly 5 is provided on the insulating cover 21. Specifically, the relief valve assembly 5 is provided on the ceramic cover 211.

In one embodiment, the pressure relief valve assembly 5 includes a valve plate 51, and the valve plate 51 is disposed separately from the sealed container 2 and on the container wall for closing or opening the pressure relief hole 221. Specifically, the valve sheet 51 is disposed on the ceramic cover 211.

The structural strength of the valve sheet 51 is less than that of the hermetic container 2. When the contact assembly 3 is in an abnormal working state, the gas with the sharply increased pressure firstly breaks the valve plate 51 and is discharged from the pressure relief hole 221 of the sealed chamber, so that the gas pressure in the sealed chamber cannot continuously increase, and the sealed chamber is protected.

It is understood that the valve sheet 51 may be made of a metal material or a non-metal material. The metal material includes, but is not limited to, iron nickel and its alloy material, copper and its alloy, aluminum and its alloy, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, and the like.

As shown in fig. 4, fig. 4 is a sectional view of the assembled insulation cover 21 and valve sheet 51 according to the first embodiment of the present invention. In the present embodiment, the insulating cover 21 includes a ceramic cover 211 and a connection member 212, the ceramic cover 211 includes a top wall 2111 and a first side wall 2112, the fixed contact 31 is provided on the top wall 2111, and the pressure relief hole 221 is provided on the top wall 2111. The first side wall 2112 has one end connected to the edge of the top wall 2111 and the other end extending toward the first yoke plate 22 and connected to the connecting member 212. The valve sheet 51 is disposed on the top wall 2111 and covers the relief hole 221.

It is understood that the valve sheet 51 may be disposed on the inner wall surface of the ceramic cover 211, or may be disposed on the outer wall surface of the ceramic cover 211.

It is understood that the valve sheet 51 may be attached to the first sidewall 2112 of the ceramic cover 211 by laser welding, brazing, resistance welding, gluing, or the like.

The valve plate 51 is arranged on the ceramic cover 211, and the ceramic has the characteristics of high strength and high hardness, so that a stable and reliable base is provided for the valve plate 51, the valve plate 51 cannot easily cause strain due to deformation of the ceramic cover 211, and the valve plate 51 is prevented from failing in advance.

As shown in fig. 5, fig. 5 is a sectional view of the assembled insulation cover 21 and valve sheet 51 according to the second embodiment of the present invention. The parts of the second embodiment that are the same as the above embodiments are not repeated, and the differences are as follows: relief valve assembly 5 further comprises a transition piece 52, and valve plate 51 is connected to ceramic cover 211 via transition piece 52.

In this embodiment, the transition piece 52 may be a sheet.

The transition piece 52 has a second through hole 521 opened in the thickness direction, and the second through hole 521 communicates with the pressure relief hole 221. Valve sheet 51 is connected to transition piece 52 and covers second aperture 521. In a normal operation state, the valve sheet 51 closes the second penetration hole 521 and the pressure relief hole 221, and maintains a sealed state of the contact chamber 27. In the abnormal operation state, the valve sheet 51 is broken by the gas, resulting in the contact chamber 27 communicating with the outside through the second penetration hole 521 and the relief hole 221.

It is understood that the valve plate 51 and the transition piece 52, and the transition piece 52 and the ceramic cover 211 can be connected by laser welding, brazing, resistance welding, gluing, and the like.

In the present embodiment, the valve sheet 51 and the transition piece 52 are both provided on the outer wall surface of the ceramic cover 211. Of course, in other embodiments, the valve sheet 51 and the transition piece 52 may be provided on the inner wall surface of the ceramic cover 211.

As shown in fig. 6 to 8, fig. 6 is a sectional view of the third embodiment of the present invention after assembling the insulating cover 21 and the valve sheet 51. Fig. 7 is a sectional view of the assembled insulation cover 21 and valve sheet 51 according to the fourth embodiment of the present invention. Fig. 8 is a sectional view of an assembled insulation cover 21 and valve sheet 51 according to a fifth embodiment of the present invention.

The parts of the third to fifth embodiments that are the same as the parts of the second embodiment will not be described again, and the differences are as follows: the shape of the transition piece 52.

Specifically, the transition piece 52 of the third embodiment is generally cylindrical, for example, circular cylindrical. One end of the transition piece 52 is provided with a flange 522 protruding radially outward, one end of the transition piece 52 is connected to the ceramic cover 211 through the flange 522, and the other end of the transition piece 52 is connected to the valve plate 51.

The transition piece 52 of the fourth embodiment is substantially cylindrical, wherein one end of the transition piece 52 is connected to the valve sheet 51 via the flange 522, and the other end is connected to the ceramic cover 211.

The transition piece 52 of the fifth embodiment is cylindrical, e.g., a straight cylindrical structure, without a flange. The two ends of the transition piece 52 with the straight cylinder structure are respectively connected with the ceramic cover 211 and the valve plate 51.

As shown in fig. 9 and 10, fig. 9 is a perspective view of an assembled insulation cover 21 and valve sheet 51 according to a sixth embodiment of the present invention. Fig. 10 is a perspective view showing an assembled insulation cover 21 and valve sheet 51 according to a seventh embodiment of the present invention. The parts of the sixth and seventh embodiments that are the same as the above embodiments will not be described again, but the differences are: the relief valve assembly 5 is disposed on the first sidewall 2112 of the ceramic cover 211.

In the present embodiment, the first sidewall 2112 of the ceramic cover 211 is formed substantially in a rectangular parallelepiped structure. Wherein the pressure relief valve assembly 5 can be arranged on the long side of the cuboid structure (as shown in figure 9) and also can be arranged on the wide side of the cuboid structure (as shown in figure 10).

As shown in fig. 11 and 12, fig. 11 is a sectional view of an assembled insulation cover 21 and valve sheet 51 according to an eighth embodiment of the present invention. Fig. 12 shows a partial enlarged view at B in fig. 11. The eighth embodiment is the same as the above embodiments and will not be described again, but the differences are: the relief valve assembly 5 is provided on the connecting member 212.

Specifically, the connection member 212 is provided with the pressure relief hole 221. The relief valve assembly 5 includes a valve plate 51, and the valve plate 51 may be integrally provided in a relief hole 221 of the connector 212 to close or open the relief hole 221.

As shown in fig. 13, fig. 13 is a sectional view of the ninth embodiment of the present invention, after assembling the insulation cover 21 and the valve sheet 51. The parts of the ninth embodiment that are the same as those of the eighth embodiment will not be described again, and the differences are: the valve sheet 51 is provided separately from the connector 212 and covers the pressure release hole 221.

It will be appreciated that valve plate 51 may be connected directly to connector 212 or to connector 212 via transition piece 52. The valve sheet 51 may be provided on the inner wall surface of the connector 212 or may be provided on the outer wall surface of the connector 212.

Different embodiments of the arrangement of the pressure relief valve assembly 5 in the metal cover 23 will be described in detail with reference to fig. 14 to 20.

As shown in fig. 14, fig. 14 is a sectional view of the first embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The metal cover 23 includes a bottom wall 231 and a second side wall 232, wherein one end of the second side wall 232 is connected to the edge of the bottom wall 231, and the other end thereof extends toward the first yoke plate 22 and is connected to the second side surface 224 of the first yoke plate 22. The relief valve assembly 5 is disposed on the bottom wall 231.

Specifically, the bottom wall 231 of the metal cover 23 is provided with a pressure relief hole 221. The relief valve assembly 5 includes a valve plate 51, and the valve plate 51 is connected to the bottom wall 231 and covers the relief hole 221. When the valve sheet 51 is not broken (i.e., in a normal operating state), the valve sheet 51 performs a sealing function. When the valve plate 51 is broken (i.e., in an abnormal operation state), the gas in the driving chamber 24 may be discharged through the pressure discharge hole 221.

The structural strength of the valve sheet 51 is less than that of the hermetic container 2. When the contact assembly 3 is in an abnormal working state, the gas with the sharply increased pressure firstly breaks the valve plate 51 and is discharged from the pressure relief hole 221 of the sealed chamber, so that the gas pressure in the sealed chamber cannot continuously increase, and the sealed chamber is protected.

It is understood that the valve sheet 51 may be made of a metal material or a non-metal material. The metal material includes, but is not limited to, iron nickel and its alloy material, copper and its alloy, aluminum and its alloy, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, and the like.

Referring to fig. 14, the valve plate 51 is connected to the inner wall surface of the bottom wall 231 and covers the pressure relief hole 221. The valve sheet 51 may be connected to the inner wall surface of the bottom wall 231 by laser welding, brazing, resistance welding, gluing, or the like.

As shown in fig. 15, fig. 15 is a sectional view of the second embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The parts of the second embodiment that are the same as the parts of the first embodiment will not be described again, and the differences are as follows: the valve plate 51 is connected to the outer wall surface of the bottom wall 231 and covers the pressure release hole 221.

As shown in fig. 16, fig. 16 is a sectional view of the third embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The third embodiment is the same as the above embodiments and will not be described again, but the differences are as follows: valve sheet 51 is connected to the inner wall surface of bottom wall 231 via transition piece 52.

Specifically, the transition piece 52 is substantially cylindrical, for example, cylindrical. One end of the transition piece 52 is provided with a flange 522 protruding outward in the radial direction, one end of the transition piece 52 is connected to the inner wall surface of the bottom wall 231 through the flange 522, and the other end of the transition piece 52 is connected to the valve sheet 51.

Of course, one end of the transition piece 52 may be connected to the valve sheet 51 via the flange 522, and the other end may be connected to the inner wall surface of the bottom wall 231. Alternatively, the transition piece 52 is a straight tubular structure without a flange. The two ends of the transition piece 52 of the straight cylinder structure are respectively connected with the bottom wall 231 and the valve plate 51.

It is understood that the valve plate 51 and the transition piece 52, and the transition piece 52 and the bottom wall 231 can be connected by laser welding, brazing, resistance welding, gluing, etc.

As shown in fig. 17, fig. 17 is a cross-sectional view of the fourth embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The parts of the fourth embodiment that are the same as the parts of the third embodiment will not be described again, but the differences are as follows: valve sheet 51 is connected to the outer wall surface of bottom wall 231 by transition piece 52.

As shown in fig. 18, fig. 18 is a cross-sectional view of the fifth embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The parts of the fifth embodiment that are the same as the parts of the third embodiment will not be described again, but the differences are as follows: the transition piece 52 is a sheet, and the transition piece 52 has a second through hole 521, and the second through hole 521 is disposed corresponding to the pressure relief hole 221.

As shown in fig. 19, fig. 19 is a sectional view of the sixth embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The parts of the sixth embodiment that are the same as the parts of the fifth embodiment will not be described again, but the differences are as follows: valve sheet 51 is connected to the outer wall surface of bottom wall 231 by transition piece 52.

It should be noted that, when the valve sheet 51 is provided separately from the bottom wall 231 of the metal cover 23, the valve sheet 51 may be provided on the inner wall surface of the bottom wall 231, or may be provided on the outer wall surface of the bottom wall 231. When the valve sheet 51 is disposed on the inner wall surface of the bottom wall 231, the bottom wall 231 can provide a supporting force for the valve sheet 51, and the pressure of the gas in the sealed container 2 can act on the third side 511 of the valve sheet 51 to press the valve sheet 51 against the bottom wall 231. When the valve plate 51 is disposed on the outer wall surface of the bottom wall 231, the bottom wall 231 cannot provide a supporting force for the valve plate 51, so that a higher requirement is placed on the connection mode between the valve plate 51 and the bottom wall 231.

As shown in fig. 20, fig. 20 is a sectional view of the seventh embodiment of the present invention after the metal cover 23 and the valve sheet 51 are assembled. The seventh embodiment is the same as the above embodiments and will not be described again, but the differences are: the valve sheet 51 is integrally provided at the bottom wall 231 for closing or opening the relief hole 221.

Specifically, the bottom wall 231 has an inner wall surface and an outer wall surface, and the valve sheet 51 has a third side surface 511 and a fourth side surface 512 which are oppositely disposed. The third side 511 connects the hole wall of the pressure relief hole 221, and the fourth side 512 is flush with the outer wall.

Of course, it can be understood that the positional relationship between the bottom wall 231 and the two side surfaces of the valve sheet 21 may also be: the third side 511 of the valve plate 51 is flush with the inner wall surface of the bottom wall 231, and the fourth side 512 is connected with the hole wall of the pressure relief hole 221; alternatively, the third side 511 is spaced apart from the inner wall surface of the bottom wall 231, and the fourth side 512 is spaced apart from the outer wall surface of the bottom wall 231. That is, neither side surface of the valve sheet 51 is aligned with the inner and outer wall surfaces of the bottom wall 231.

As shown in fig. 21, fig. 21 is a sectional view of the protective cover 53 according to the embodiment of the present invention mounted on the container wall. The relief valve assembly 5 may further include a protective cover 53, and the protective cover 53 is attached to the wall of the hermetic container 2 and covers the outer surface of the valve sheet 51. The protective cover 53 has a vent hole 531, and gas can act on the valve sheet 51 through the vent hole 531.

It is understood that the protective cover 53 may be attached to the ceramic cover 211, the connecting member 212, or the metal cover 23. The protective cover 53 may be provided on the outer wall surface 282 of the sealed container 2.

In this embodiment, by adding the protection cover 53, the valve sheet 51 is protected by gas in the process of transporting or installing the sealed container 2 without affecting the abnormal working state, and the valve sheet 51 is prevented from being punctured by foreign objects.

It is understood that the protective cover 53 may be made of a metallic material or a non-metallic material. The metal material includes, but is not limited to, iron nickel and its alloy material, copper and its alloy, aluminum and its alloy, etc. Non-metallic materials include, but are not limited to, ceramics, glass, carbon fiber, plastics, and the like.

The protective cover 53 may be connected to the hermetic container 2 by laser welding, brazing, resistance welding, gluing, or the like.

As shown in fig. 22, fig. 22 is an exploded view of the first embodiment of the housing 1 of the present invention. The housing 1 of the embodiment of the present invention includes a first housing 11 and a second housing 12, wherein the second housing 12 is detachably connected to the first housing 11; the first shell 11 and/or the second shell 12 are provided with air release structures 13, and the air release structures 13 are communicated with the hollow cavity 14.

Through setting up disappointing structure 13, make the utility model discloses shell 1 of embodiment is the non-sealed structure, and gas can be by contact chamber 27 inside get into the well cavity 14 of shell 1 after discharging through pressure release hole 221, and the outside to shell 1 is arranged to the structure 13 that loses heart of rethread.

In addition, the utility model discloses shell 1 still can block that the gaseous splash thing that produces in the contact chamber 27 directly arranges to the relay outside in the twinkling of an eye of releasing, avoids polluting other electron devices near the relay. Wherein, the gas splash is generated by burning and volatilizing the metal material of the contact component 3 at high temperature.

With continued reference to fig. 22, the venting structure 13 includes a gap 131, and the gap 131 is formed between the first housing 11 and the second housing 12. Gas can exit the relay through the gap 131 between the first housing 11 and the second housing 12.

In the present embodiment, the slit 131 is located at the bottom of the housing 1.

As shown in fig. 23, fig. 23 is an exploded view of a second embodiment of the housing 1 of the present invention. The housing 1 of the second embodiment is the same as the housing 1 of the first embodiment, and the differences are as follows: the slit 131 is located in the middle region in the height direction of the housing 1.

As shown in fig. 24, fig. 24 is an exploded view of a third embodiment of the housing 1 of the present invention. The housing 1 of the third embodiment is the same as the housing 1 of the second embodiment, and the differences are as follows: the air release structure 13 includes a slit 131 and an air release hole 132, the slit 131 being formed in the middle area in the height direction of the casing 1, and the air release hole 132 being formed in the second housing 12. Gas can exit the relay through the slit 131 and the bleed hole 132. Of course, the air release hole 132 may be provided on the first housing 11.

As shown in fig. 25, fig. 25 is an exploded view of a fourth embodiment of the housing 1 of the present invention. The housing 1 of the fourth embodiment is the same as the housing 1 of the previous embodiment, and the differences are as follows: the air release structure 13 includes a slit 131 and an air release cover 133, the slit 131 is formed in the middle area in the height direction of the housing 1, the air release cover 133 is disposed on the first housing 11, and the opening of the air release cover 133 faces downward. Thus, gas can exit the relay through the slit 131 and the bleed cover 133, and the gas exiting the bleed cover 133 is ejected downward without affecting other electronic devices near the relay.

Of course, the relief cover 133 may be disposed on the second housing 12; or the first shell 11 and the second shell 12 are both provided with the air release cover 133.

As shown in fig. 26, fig. 26 is an exploded view of a fifth embodiment of the housing 1 of the present invention. The housing 1 of the fifth embodiment is the same as the housing 1 of the above-mentioned embodiment, and the description thereof is omitted, except that: the air-release structure 13 includes a slit 131 formed in the middle area in the height direction of the casing 1 and an air-release grill 134, and the air-release grill 134 is provided on the first housing 11. Of course, the air-release grille 134 may also be disposed on the second housing 12, or both the first housing 11 and the second housing 12 may be disposed with the air-release grille 134.

Gas can exit the relay through the slits 131 and bleed grid 134. When the gas passes through the air escape grid 134, the air escape grid 134 can make the gas flow of the gas more gentle, and the influence of the discharged gas on other electronic devices near the relay is avoided.

It is understood that the various embodiments/implementations provided by the present invention can be combined without contradiction, and are not illustrated herein.

To sum up, the utility model discloses the advantage and the beneficial effect of relay include at least:

the utility model discloses relay through set up relief valve subassembly 5 on sealed container 2 for the overpressure gas of releasing, and then ensure contact subassembly 3 under the unusual operating mode such as short circuit, overload divide absolutely, the relay can not take place to lead to gaseous sharp inflation to cause the cavity explosion to disintegrate because of the inside high temperature of cavity, has increased the reliability of product.

Additionally, the utility model discloses the design of the shell 1 of relay is non-seal structure, both can in time discharge the gas of releasing, can prevent again that the thing that releases from causing the pollution to other electron device.

In the embodiments of the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims (19)

1. A sealed contact unit, comprising:

the sealed container is provided with a sealed chamber and a pressure relief hole, and the pressure relief hole penetrates through the wall of the sealed container and is communicated with the sealed chamber;

a contact assembly including a fixed contact and a movable contact disposed within the sealed chamber and configured to be movable into and out of contact with the fixed contact to make or break an electric current between the fixed contact and the movable contact; and

the pressure relief valve assembly is arranged on the wall of the container of the sealed container and used for closing the pressure relief hole when the gas pressure in the sealed container is smaller than a threshold value and being broken to open the pressure relief hole when the gas pressure in the sealed container is larger than or equal to the threshold value.

2. The sealed contact unit of claim 1, wherein the pressure relief valve assembly comprises a valve plate integrally disposed in the container wall for closing or opening the pressure relief hole.

3. The sealed contact unit of claim 2, wherein the container wall has an inner wall surface and an outer wall surface, and the valve plate has third and fourth oppositely disposed side surfaces;

the third side face is connected with the hole wall of the pressure relief hole, and the fourth side face is flush with the outer wall face.

4. The sealed contact unit of claim 1, wherein the pressure relief valve assembly comprises a valve plate, the valve plate being disposed separately from the container wall and at the pressure relief hole for closing or opening the pressure relief hole.

5. The sealed contact unit according to claim 4, wherein the container wall has an inner wall surface and an outer wall surface, and the valve sheet is provided on the inner wall surface and/or the outer wall surface.

6. The sealed contact unit of claim 4, wherein the pressure relief valve assembly further comprises a transition piece through which the valve plate is connected to the vessel wall.

7. The sealed contact unit of any of claims 2 to 6, wherein the pressure relief valve assembly further comprises a protective cover attached to the vessel wall and covering the outer surface of the valve plate; the protective cover is provided with a vent hole.

8. The sealed contact unit of claim 1, wherein the pressure relief valve assembly has a structural strength less than that of the sealed container.

9. An electrical component comprising a sealed contact unit according to any of claims 1 to 8.

10. The electrical component of claim 9, further comprising a housing having a hollow chamber;

and the sealing container and the pressure relief valve assembly of the sealing contact unit are both positioned in the hollow cavity.

11. The electrical component of claim 10, wherein the housing comprises:

a first housing;

the second shell is detachably connected with the first shell; and the first shell and/or the second shell are/is provided with an air leakage structure, and the air leakage structure is communicated with the hollow cavity.

12. The electrical component of claim 11, wherein the venting feature comprises a gap formed between the first housing and the second housing.

13. The electrical component of claim 11, wherein said venting structure comprises a venting hole and/or a venting cover and/or a venting grid.

14. The electrical component of claim 10 or 11, wherein the hollow chamber is in communication with an exterior of the housing.

15. The electrical component of claim 9, wherein the electrical component is a relay.

16. The electrical component of claim 15, wherein the sealed container of the sealed contact unit comprises:

the first yoke iron plate comprises a first side surface, a second side surface and a through hole, wherein the first side surface, the second side surface and the through hole are oppositely arranged, and the through hole penetrates through the first side surface and the second side surface;

the insulating cover is connected with the first side surface and covers the through hole; and

the metal cover is connected with the second side surface and covers the through hole;

wherein, the insulating cover and/or the metal cover are/is provided with the pressure relief hole.

17. The electrical component of claim 16, wherein the pressure relief valve assembly is disposed on the insulating enclosure, the insulating enclosure comprising:

a ceramic cover, the fixed contact being disposed on the ceramic cover;

one end of the connecting piece is connected with the edge of the opening of the ceramic cover, and the other end of the connecting piece is connected with the first side face;

the ceramic cover and/or the connecting piece are/is provided with the pressure relief hole.

18. The electrical component of claim 17, wherein the ceramic cover comprises:

a top wall on which the fixed contact is disposed;

one end of the first side wall is connected to the edge of the top wall, and the other end of the first side wall extends towards the first yoke plate and is connected with the connecting piece;

the top wall and/or the first side wall are/is provided with the pressure relief hole.

19. The electrical component of claim 16, wherein the pressure relief valve assembly is disposed on the metal cover; the metal cover includes:

a bottom wall;

one end of the second side wall is connected to the edge of the bottom wall, and the other end of the second side wall extends towards the first yoke plate and is connected with the second side face;

the bottom wall is provided with the pressure relief hole.

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