CN116959920A - Relay device - Google Patents

Abstract

The invention provides a relay, which comprises a contact container, a contact assembly and a pressure relief valve assembly. The contact container comprises a ceramic cover and a first yoke plate, and the ceramic cover and the first yoke plate enclose a contact chamber; the ceramic cover is provided with a pressure relief hole which is communicated with the contact cavity; the contact assembly comprises a pair of static contact leading-out ends and a movable reed, the static contact leading-out ends are arranged on the ceramic cover, and one ends of the static contact leading-out ends extend into the contact cavity; the movable reed is arranged in the contact cavity and is used for being driven to be respectively contacted with or separated from the pair of stationary contact leading-out ends; the pressure relief valve assembly is arranged on the ceramic cover and is used for sealing the pressure relief hole when the gas pressure in the contact cavity is smaller than a threshold value and is broken to open the pressure relief hole when the gas pressure in the contact cavity is larger than or equal to the threshold value.

Description

Relay device

Technical Field

The invention relates to the technical field of relays, in particular to a relay with a pressure relief valve assembly.

Background

Along with the improvement of the endurance mileage requirement of the new energy automobile, the heat loss of the high-voltage direct current relay is required to be reduced under normal conditions, and the short-circuit current and the voltage of the relay are required to be further increased due to higher battery capacity when the battery pack is in short circuit. When the short-circuit load is very large, the high-voltage direct-current relay contact can generate electric repulsive force due to the short-circuit current to generate contact spring-open, so that contact arcing occurs, and the load short-circuit current and the load short-circuit voltage are very high, so that the instantaneous contact is subjected to severe arcing.

Because the reliability of the contact resistance of the contact is required to be ensured, a large part of product contact systems of the high-voltage direct-current relay are sealed, and the inside of a contact sealing cavity is also filled with hydrogen or nitrogen with certain pressure for assisting arc extinction.

However, in the operation process of the relay in the related art, when the contact system is in the moment of high-current short circuit or overload breaking, the explosion of the contact sealing cavity is easy to occur.

Disclosure of Invention

The embodiment of the invention provides a relay capable of improving safety so as to solve the problem of explosive explosion in the related technology.

The relay of the embodiment of the invention comprises: a contact receptacle, a contact assembly, and a pressure relief valve assembly. The contact container comprises a ceramic cover and a first yoke plate, and a contact cavity is defined by the ceramic cover and the first yoke plate; the ceramic cover is provided with a pressure relief hole, and the pressure relief hole is communicated with the contact cavity; the contact assembly comprises a pair of stationary contact leading-out ends and a movable reed, the stationary contact leading-out ends are arranged on the ceramic cover, and one ends of the stationary contact leading-out ends extend into the contact cavity; the movable reed is arranged in the contact cavity and is used for being driven to be respectively contacted with or separated from a pair of static contact leading-out ends; the pressure relief valve component is arranged on the ceramic cover and is used for sealing the pressure relief hole when the gas pressure in the contact cavity is smaller than a threshold value and is broken to open the pressure relief hole when the gas pressure in the contact cavity is larger than or equal to the threshold value.

According to some embodiments of the invention, the pressure relief valve assembly comprises a valve plate integrally provided on the ceramic cover for closing or opening the pressure relief hole.

According to some embodiments of the invention, the pressure relief valve assembly comprises a valve plate, wherein the valve plate is arranged separately from the ceramic cover and is arranged in the pressure relief hole for closing or opening the pressure relief hole.

According to some embodiments of the invention, the ceramic cover has an inner wall surface and an outer wall surface, the valve plate being disposed on the inner wall surface and/or the outer wall surface.

According to some embodiments of the invention, the relief valve assembly further comprises a transition piece through which the valve plate is connected to the ceramic cover.

According to some embodiments of the invention, the pressure relief valve assembly further comprises a protective cover connected to the ceramic cover and covering the outer surface of the valve plate; the protective cover has a vent.

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

the fixed contact leading-out end is arranged on the top wall;

the side wall is arranged on the edge of the top wall in a surrounding mode, extends towards the first yoke plate and is connected with the first yoke plate;

wherein the top wall and/or the side wall is/are provided with the pressure relief holes.

According to some embodiments of the invention, the relay further comprises a housing having a hollow chamber;

the contact vessel and the pressure relief valve assembly are disposed within the hollow chamber.

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 is/are provided with a gas leakage structure, and the gas leakage structure is communicated with the hollow cavity.

According to some embodiments of the invention, the venting structure includes a slit formed between the first housing and the second housing.

According to some embodiments of the invention, the venting structure comprises venting holes and/or venting hoods and/or venting grids.

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 structural strength of the pressure relief valve assembly is less than the structural strength of the contact vessel.

According to some embodiments of the invention, the contact vessel further comprises a connection member through which the ceramic cover is connected to the first yoke plate.

One embodiment of the above invention has at least the following advantages or benefits:

according to the relay provided by the embodiment of the invention, the pressure relief valve component is arranged on the ceramic cover to release the overpressure gas, so that the relay is prevented from explosion and disassembly of the cavity caused by rapid expansion of the gas due to high temperature in the contact cavity under abnormal working conditions such as short circuit, overload breaking and the like of the contact component, and the reliability of a product is improved. In addition, set up the benefit of relief valve subassembly on the pottery cover still lies in, owing to pottery has the characteristics of high strength, high rigidity, is equivalent to providing reliable and stable base for the relief valve subassembly can not bring the strain because of the deformation of pottery cover easily, avoids the relief valve subassembly to become invalid in advance.

In addition, the shell of the relay is designed to be of a non-sealing structure, so that the release gas can be timely discharged, and pollution of other electronic devices caused by release matters can be prevented.

Drawings

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

Figure 2 shows a cross-sectional view of A-A in figure 1.

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

Fig. 4 shows a cross-sectional view of the ceramic cap and valve plate of the first embodiment of the present invention after assembly.

Fig. 5 shows a cross-sectional view of a ceramic cap and valve plate of a second embodiment of the present invention after assembly.

Fig. 6 shows a cross-sectional view of a ceramic cap and valve plate of a third embodiment of the present invention after assembly.

Fig. 7 shows a cross-sectional view of a ceramic cap and valve plate according to a fourth embodiment of the present invention after assembly.

Fig. 8 shows a sectional view of a ceramic cap and valve plate according to a fifth embodiment of the present invention after assembly.

Fig. 9 is a perspective view showing an assembled ceramic cap and valve sheet according to a sixth embodiment of the present invention.

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

FIG. 11 shows a cross-sectional view of a protective cover according to an embodiment of the present invention mounted on a ceramic cover.

Fig. 12 shows an exploded view of a first embodiment of the housing of the present invention.

Fig. 13 shows an exploded view of a second embodiment of the housing of the present invention.

Fig. 14 shows an exploded view of a third embodiment of the housing of the present invention.

Fig. 15 shows an exploded view of a fourth embodiment of the housing of the present invention.

Fig. 16 shows an exploded view of a fifth embodiment of the housing of the present invention.

Wherein reference numerals are as follows:

1. outer casing

11. First shell body

12. Second shell

13. Air leakage structure

131. Gap(s)

132. Air leakage hole

133. Air release cover

134. Air release grille

14. Hollow chamber

2. Contact container

211. Ceramic cover

2111. Top wall

2112. Side wall

212. Connecting piece

22. First yoke plate

221. Pressure relief hole

222. Through hole

223. First side surface

224. Second side surface

23. Metal cover

24. Driving chamber

25. Second yoke plate

26. Third yoke plate

27. Contact chamber

3. Contact assembly

31. Stationary contact leading-out end

32. Movable reed

4. Driving assembly

41. Electromagnet unit

411. Coil rack

4111. A first flange part

4112. Hollow cylindrical portion

4113. A second flange part

412. Coil

413. Static iron core

4131. First perforation

414. Movable iron core

415. First elastic piece

416. Magnetic conduction sleeve

42. Push rod unit

421. U-shaped bracket

422. Base seat

423. Push rod

424. Second elastic piece

425. First magnetizer

426. Second magnetizer

5. Pressure relief valve assembly

51. Valve plate

52. Transition piece

521. Second perforation

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. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

As described in the background art, the contact system of the relay in the related art is easy to explode in the moment of high-current short circuit or overload breaking moment, and has potential safety hazard. The inventor of the present invention found in the study that, because the contact inside the contact seal cavity is severely burned, a high temperature is instantaneously generated inside the seal cavity, so that the air pressure inside the contact seal cavity is instantaneously and rapidly increased, and once the air pressure intensity inside the contact seal cavity is greater than the intensity of the component parts of the contact seal cavity or the intensity of the connection part, the contact seal cavity of the relay is easy to explode.

As shown in fig. 1 and 2, fig. 1 is a top view of a relay according to an embodiment of the present invention. Figure 2 shows a cross-sectional view of A-A in figure 1. The relay of the embodiment of the invention comprises a shell 1, a contact container 2, a contact assembly 3, a driving assembly 4 and a pressure relief valve assembly 5. The housing 1 has a hollow chamber 14, the hollow chamber 14 communicating with the outside of the housing 1. The contact vessel 2 is disposed in the hollow chamber 14, the contact vessel 2 including a ceramic cover 211 and a first yoke plate 22, the ceramic cover 211 and the first yoke plate 22 enclosing a contact chamber 27. The ceramic cover 211 has a relief hole 221, and the relief hole 221 communicates with the contact chamber 27 and the hollow chamber 14. The contact assembly 3 includes a pair of stationary contact leading-out ends 31 and a movable contact spring 32, the stationary contact leading-out ends 31 are provided on the ceramic cover 211, and one ends of the stationary contact leading-out ends 31 extend into the contact chamber 27, and the other ends are exposed to the outer surface of the housing 1. A movable contact spring 32 is provided in the contact chamber 27 for being driven to contact with or separate from the pair of stationary contact leading-out ends 31, respectively. The driving assembly 4 is disposed in the hollow chamber 14 and is connected to the movable spring plate 32 for driving the movable spring plate 32 to move so as to enable the two ends of the movable spring plate 32 to respectively contact with or separate from the pair of stationary contact leading-out ends 31. The relief valve assembly 5 is provided on the ceramic cover 211 for closing the relief hole 221 when the gas pressure in the contact chamber 27 is less than a threshold value, and for being broken to open the relief hole 221 when the gas pressure in the contact chamber 27 is greater than or equal to a threshold value. The structural strength of the pressure relief valve assembly 5 is less than that of the contact vessel 2; in normal operating conditions, the maximum value of the gas pressure intensity in the contact chamber 27 is smaller than the structural intensity of the pressure relief valve assembly 5; in the abnormal operating state, the maximum value of the gas pressure intensity in the contact chamber 27 is greater than the structural intensity of the relief valve assembly 5. It will be appreciated that in one embodiment, when the pressure relief valve assembly 5 closes the pressure relief hole 221, the tightness of the contact chamber can be maintained, ensuring the normal operation of the relay. Of course, in other embodiments, when the relief valve assembly 5 closes the relief aperture 221, the contact chamber 27 is not absolutely sealed, so long as the relay is functioning properly.

The relay of the embodiment of the invention is provided with a pressure relief valve assembly 5 on the ceramic cover 211 for closing or opening the pressure relief hole 221. In the normal operation state of the contact assembly 3, the gas pressure intensity in the contact chamber is smaller than the threshold value, so that the pressure release valve assembly 5 is not broken by the gas pressure in the contact chamber, and the state of closing the pressure release hole 221 is still maintained, so that the relay can still work normally. In the abnormal working state of the contact assembly 3, the gas pressure intensity in the contact chamber 27 is greater than or equal to the threshold value, so that the pressure release valve assembly 5 is broken through by the gas pressure in the contact chamber, the contact chamber is communicated with the hollow chamber 14 of the shell 1 through the pressure release hole 221, and then the gas pressure in the contact chamber can be released to the hollow chamber 14 through the pressure release hole 221, and finally is released to the outside of the shell 1. That is, in the abnormal working state, during the gradual rising of the gas pressure intensity in the contact chamber 27, the gas pressure will break the pressure release valve assembly 5, and then the rapidly rising gas pressure is released through the pressure release hole 221, so that the gas pressure in the contact chamber 27 will not continuously rise, that is, the structural strength of the contact container 2 will not be reached, and the explosion of the contact chamber 27 will be avoided. Under normal operating conditions, the pressure of the gas in the contact chamber 27 does not break the relief valve assembly 5, and the relief valve assembly 5 still functions to seal the relief hole 221.

It will be appreciated that the term "normal operating condition" means that the current of the relay is in the rated condition, and the term "abnormal operating condition" means that the contact assembly 3 is in a heavy current short circuit moment, or an overload breaking moment. Furthermore, the term "threshold" represents a pressure that is slightly greater than the pressure of the gas in the contact vessel 2 at which the relay is in normal operation. The threshold value is also adapted to the relay type number, but cannot be greater than the structural strength of the contact container 2.

That is, when the relay is in normal operation, the pressure of the gas within the contact vessel 2 does not reach the threshold value, so that the pressure relief valve assembly 5 is not breached. When the relay is in an abnormal operation state, the pressure of the gas in the contact vessel 2 is equal to or higher than the threshold value, and the pressure release valve assembly 5 is broken by the gas.

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

It will be appreciated that the design of the pressure relief valve assembly 5 to have a structural strength less than that of the contact vessel 2 may be of different materials and/or different construction. For example, when the material of the pressure relief valve assembly 5 and the container wall contacting the container 2 are the same, the thickness of the pressure relief valve assembly 5 can be designed to be thinner and smaller than the container wall contacting the container 2, so that the gas with gradually rising temperature can preferentially break the pressure relief valve assembly 5. Of course, in the case where the thickness of the relief valve assembly 5 and the wall of the container contacting the container 2 are the same, the relief valve assembly 5 may be made of ceramic, and the contact container 2 may be made of metal, so that the relief valve assembly 5 may be broken first. Alternatively, the pressure relief valve assembly 5 is thin and made of ceramic, and the chamber wall contacting the container 2 is thick and made of metal. Of course, other suitable means may be employed to provide the relief valve assembly 5 with a structural strength less than that of the contact vessel 2, and are not illustrated herein.

It will be understood that the terms "comprising," "including," and "having," and any variations thereof, are intended to cover non-exclusive inclusions in the embodiments of the invention. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or 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 may be assembled by directly installing the contact container 2, the contact assembly 3, the driving assembly 4, and the pressure release valve assembly 5 in an application product, such as a battery pack, an electrical control box.

With continued reference to fig. 1 and 2, the contact assembly 3 includes two stationary contact terminals 31 for current inflow and outflow, respectively, and a movable contact spring 32. The movable reed 32 may be in a straight sheet shape, and two ends of the movable reed 32 can be respectively contacted with the two stationary contact leading-out ends 31 under the action of the driving assembly 4 along the length direction of the movable reed 32, so that the load is communicated. The bottom of the stationary contact lead-out end 31 serves as a stationary contact, and both ends of the movable contact spring 32 in the longitudinal direction thereof can serve as movable contacts. The movable contacts at the two ends of the movable reed 32 may protrude from other parts of the movable reed 32 or may be flush with other parts.

It will be appreciated that the stationary contact may be integrally or separately provided at the bottom of the stationary contact lead-out end 31, and the movable contact may be integrally or separately provided at both ends of the movable reed 32 in the extended length direction.

Two stationary contact lead-out ends 31 are provided on the ceramic cap 211, for example, on top of the ceramic cap 211. And, one end of each stationary contact leading-out end 31 protrudes into the interior of the contact chamber 27, and the other end is exposed to the outer surface of the housing 1. The end of the stationary contact lead-out end 31 that protrudes into the interior of the contact chamber 27 is adapted to contact the movable spring 32.

The relay further comprises an arc extinguishing unit 7, which arc extinguishing unit 7 is arranged in the hollow chamber 14 of the housing 1 for extinguishing the 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 be substantially rectangular parallelepiped. The two arc extinguishing magnets 71 are provided on both sides of the contact container 2, respectively, and are disposed opposite to each other along the longitudinal direction of the movable reed 32.

As shown in fig. 2, two arc extinguishing magnets 71 are respectively located at the left and right sides of the contact container 2. In the present embodiment, the polarities of the faces of the two arc extinguishing magnets 71 facing each other are opposite. That is, the left side of the arc extinguishing magnet 71 located on the left side of the contact container 2 is the S-pole and the right side is the N-pole, and the left side of the arc extinguishing magnet 71 located on the right side of the contact container 2 is the S-pole and the right side is the N-pole.

Of course, the polarities of the surfaces of the two arc extinguishing magnets 71 facing each other may be designed to be identical, for example, the left surface of the arc extinguishing magnet 71 located on the left side of the ceramic cover 211 is an S-pole and the right surface is an N-pole, and the left surface of the arc extinguishing magnet 71 located on the right side of the ceramic cover 211 is an N-pole and the right surface is an S-pole.

By providing two opposing arc extinguishing magnets 71 in this way, a magnetic field can be formed around the contact assembly 3. Therefore, the arc generated between the stationary contact leading-out end 31 and the movable contact spring 32 is elongated in a direction away from each other by the magnetic field, and arc extinction is achieved.

The arc extinguishing unit 7 further includes two yoke frames 72, and the two yoke frames 72 are provided corresponding to the positions of the two arc extinguishing magnets 71. And, two yoke frames 72 surround the contact container 2 and the two arc extinguishing magnets 71. Through the design that yoke iron frame 72 encircles arc extinguishing magnet 71, the magnetic field that can avoid arc extinguishing magnet 71 to produce outwards diffuses, influences the arc extinguishing effect. The yoke iron clamp 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 contact case 2 includes a first yoke plate 22, a ceramic cap 211, and a connector 212. The first yoke plate 22 is disposed within the hollow chamber 14 and includes first and second oppositely disposed side surfaces 223 and 224 and a through hole 222, the through hole 222 penetrating the first and second side surfaces 223 and 224.

The ceramic cover 211 is coupled to the first side 223 of the first yoke plate 22 by the coupling piece 212, and the ceramic cover 211 covers the through hole 222. The ceramic cover 211, the connecting piece 212 and the first yoke plate 22 together enclose the contact chamber 27, the contact chamber 27 communicates with the through hole 222, and the contact chamber 27 is used for accommodating part of the stationary contact lead-out end 31 and the movable contact spring 32.

The relay further includes a metal cap 23, and the metal cap 23 is coupled to the second side 224 of the first yoke plate 22 and covers the through hole 222. The metal cover 23 and the first yoke plate 22 enclose a driving chamber 24, the driving chamber 24 being in communication with the through hole 222, the driving chamber 24 being for accommodating a stationary iron core 413 and a movable iron core 414, which will be described in detail later. The contact chamber 27 communicates with the drive chamber 24 through a through hole 222. In this embodiment, the contact chamber 27 communicates with the drive chamber 24 to form a sealed chamber.

The ceramic cover 211 is connected to the first yoke plate 22 through a connector 212. Specifically, the connecting member 212 may have a ring 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, brazing, resistance welding, gluing, or the like. The other end of the connecting piece 212 is connected to the first side 223 of the first yoke plate 22, and may be welded by laser, soldering, resistance welding, gluing, or the like. A connection member 212 is provided between the ceramic cover 211 and the first yoke plate 22 to facilitate connection of the ceramic cover 211 and the first yoke plate 22.

With continued reference to fig. 2, the driving assembly 4 includes an electromagnet unit 41 and a push rod unit 42, and the electromagnet unit 41 is disposed on a side of the first yoke plate 22 facing away from the ceramic cover 211 and surrounds the metal cover 23. The push rod unit 42 is in driving connection with the electromagnet unit 41, and the push rod unit 42 is movably disposed in the driving chamber 24 and connected with the movable reed 32 through the through hole 222.

When the electromagnet unit 41 is electrified, the push rod unit 42 can be driven to move, and then the movable reed 32 is driven to move so as to be contacted with or separated from the stationary contact leading-out end 31.

The electromagnet unit 41 includes a bobbin 411, a coil 412, a stationary iron core 413, and a movable iron 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 cap 23, and a portion 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 position of the through hole 222 for the push rod unit 42 to pass therethrough. A movable iron core 414 is movably provided in the metal cover 23 and is provided opposite to the stationary iron core 413, the movable iron core 414 being connected to the push rod unit 42 for being attracted by the stationary iron core 413 when the coil is energized. The plunger 414 and the pushrod 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, the first flange portion 4111 and the second flange portion 4113 being provided at both ends of the hollow cylindrical portion 4112, respectively. 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 iron core 413 and the movable iron core 414, for resetting the movable iron core 414 when the coil is de-energized. The first elastic member 415 may be a spring and is sleeved outside the pushrod 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 sandwiched between the first yoke plate 22 and the second yoke plate 25, i.e., the first yoke plate 22 is connected to the first flange portion 4111 of the bobbin 411, and the second yoke plate 25 is connected to the second flange portion 4113 of the bobbin 411.

A pair of third yoke plates 26 are provided at both ends of the second yoke plate 25 in the length direction of the movable reed 32, respectively, and extend toward the first yoke plate 22, and are connected to both ends of the first yoke plate 22 in the length direction of the movable reed 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 of an integral structure, for example, formed by bending. The first yoke plate 22 and the integrally formed second yoke plate 25 and pair of third yoke plates 26 may be of a split structure.

The relay further comprises a magnetically permeable sleeve 416, the magnetically permeable 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 sleeve 416 is provided in a space 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 iron core 413, the movable iron core 414, and the magnetic sleeve 416 together form a magnetic circuit.

The push rod unit 42 includes a U-shaped bracket 421, a base 422, a fixing piece, a push rod 423, a second elastic member 424, a first magnetizer 425, and a second magnetizer 426. The first magnetizer 425 is fixedly connected with the U-shaped bracket 421, and the first magnetizer 425 is arranged on the inner side surface of the U-shaped bracket 421. Second magnetizer 426 is fixedly coupled to movable reed 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 bracket 421 is fixedly connected with the fixing piece, the U-shaped bracket 421 and the base 422 enclose a frame structure, and the movable reed 32, the first magnetizer 425 and the second magnetizer 426 are arranged in the frame structure enclosed by the U-shaped bracket 421 and the base 422. And, 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 abuts against the movable spring plate 32, and the second elastic member 424 can provide an elastic force, so that the movable spring plate 32 and the second magnetizer 426 have a tendency to be far away from the base 422 and close to the first magnetizer 425. The push 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 push rod 423 is fixedly connected to the base 422, and the other end of the push rod 423 is fixedly connected to the movable core 414.

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

When the push rod 423 is not moved upward, the top surface of the movable reed 32 abuts against the first magnetizer 425 under the action of the second elastic member 424. When the coil 412 is energized to drive the push rod 423 upward, both ends of the movable reed 32 are respectively contacted with the two stationary contact leading-out ends 31. Then, the pushing rod 423 continues to move upwards, the first magnetizer 425 also continues to move upwards along with the pushing rod 423, and the movable reed 32 cannot move upwards due to the fact that the movable reed 32 is in contact with the two stationary contact leading-out ends 31, so that the overtravel of the contacts is realized. Due to the elastic force provided by second elastic member 424, a certain gap is formed between the bottom surface of first magnetizer 425 and the top surface of movable reed 32, and thus a magnetic gap exists between first magnetizer 425 and second magnetizer 426.

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

In one embodiment, the relief valve assembly 5 includes a valve plate 51, where the valve plate 51 is separate from the ceramic cover 211 for closing or opening the relief hole 221.

The structural strength of the valve plate 51 is smaller than that of the contact container 2. When the contact assembly 3 is in an abnormal working state, the gas with the rapidly increased pressure breaks the valve plate 51 first and is discharged from the pressure release hole 221 of the ceramic cover 211, so that the gas pressure in the contact container 2 cannot continuously rise, and the contact container 2 is protected.

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

Of course, the valve plate 51 may be integrally provided on the ceramic cover 211 for closing or opening the pressure release hole 221. When the valve plate 51 and the ceramic cover 211 are integrally formed, both the valve plate 51 and the ceramic cover 211 are made of ceramic materials.

As shown in fig. 4, fig. 4 is a sectional view showing an assembled ceramic cap 211 and valve plate 51 according to the first embodiment of the present invention. In the present embodiment, the ceramic cover 211 includes a top wall 2111 and a side wall 2112, the stationary contact lead-out end 31 is provided on the top wall 2111, and the pressure release hole 221 is provided on the top wall 2111. The side wall 2112 is provided around the edge of the top wall 2111, extends toward the first yoke plate 22, and is connected to the connector 212. The valve plate 51 is provided on the top wall 2111 and covers the relief hole 221.

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

It will be appreciated that the valve plate 51 may be attached to the top wall 2111 of the ceramic cap 211 by laser welding, brazing, resistance welding, gluing, or the like.

As shown in fig. 5, fig. 5 is a sectional view showing an assembled ceramic cover 211 and valve plate 51 according to a second embodiment of the present invention. The second embodiment is the same as the above embodiment, and the difference is that: the relief valve assembly 5 further includes a transition piece 52, and the valve plate 51 is coupled to the ceramic cover 211 via the 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 release hole 221. The valve plate 51 is connected to the transition piece 52 and covers the second through hole 521. Under normal operation, the valve plate 51 closes the second through hole 521 and the pressure relief hole 221, maintaining the sealed state of the contact chamber 27. In an abnormal operation condition, the valve plate 51 is broken by the gas, resulting in the contact chamber 27 communicating with the outside through the second through hole 521 and the pressure release 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 may be connected by laser welding, brazing, resistance welding, gluing, or the like.

In the present embodiment, the valve plate 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 plate 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 showing an assembled ceramic cap 211 and valve plate 51 according to a third embodiment of the present invention. Fig. 7 shows a cross-sectional view of the ceramic cup 211 and the valve plate 51 of the fourth embodiment of the present invention assembled. Fig. 8 shows a sectional view of the ceramic cap 211 and the valve plate 51 of the fifth embodiment of the present invention after assembly.

The third to fifth embodiments are the same as the second embodiment and are not described in detail, and the difference is that: the shape of the transition piece 52.

Specifically, as shown in fig. 6, the transition piece 52 of the third embodiment is substantially cylindrical, for example, 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.

As shown in fig. 7, the transition piece 52 of the fourth embodiment is substantially cylindrical, wherein one end of the transition piece 52 is connected to the valve plate 51 by a flange 522, and the other end is connected to the ceramic cover 211.

As shown in fig. 8, the transition piece 52 of the fifth embodiment is cylindrical, for example, a straight cylindrical structure, without providing a flange. The two ends of the transition piece 52 of 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 showing an assembled ceramic cap 211 and valve plate 51 according to a sixth embodiment of the present invention. Fig. 10 is a perspective view showing an assembled ceramic cap 211 and valve plate 51 according to a seventh embodiment of the present invention. The sixth and seventh embodiments are the same as the above embodiments, and are different from each other in that: the pressure relief valve assembly 5 is disposed on the sidewall 2112 of the ceramic cap 211.

In this embodiment, the sidewall 2112 of the ceramic cap 211 forms a substantially rectangular parallelepiped structure. The pressure relief valve assembly 5 may be disposed on the long side of the rectangular parallelepiped (fig. 9) or on the wide side of the rectangular parallelepiped (fig. 10).

As shown in fig. 11, fig. 11 shows a cross-sectional view of a protective cover 53 according to an embodiment of the present invention mounted on a ceramic cover. The relief valve assembly 5 may further include a protective cover 53, where the protective cover 53 is connected to the ceramic cover 211 and covers the outer surface of the valve plate 51. The protection cover 53 has a vent hole 531, and the gas can act on the valve plate 51 through the vent hole 531.

It is understood that the protective cover 53 may be provided on the outer wall surface of the ceramic cover 211.

In this embodiment, by adding the protection cover 53, the valve plate 51 is not affected in an abnormal working state, and the valve plate 51 can be protected during transportation or assembly of the ceramic cover 211, so that the valve plate 51 is prevented from being punctured by a foreign object.

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

The protective cover 53 may be connected to the ceramic cover 211 by laser welding, soldering, resistance welding, gluing, or the like.

As shown in fig. 12, fig. 12 shows an exploded view of a first embodiment of the housing 1 according to the invention. The housing 1 of the embodiment of the present invention includes a first housing 11 and a second housing 12, the second housing 12 being detachably connected to the first housing 11; the first housing 11 and/or the second housing 12 are provided with a venting structure 13, and the venting structure 13 is communicated with the hollow chamber 14.

By providing the air release structure 13, the housing 1 according to the embodiment of the present invention is in a non-sealing structure, and air can be discharged from the interior of the contact chamber 27 through the pressure release hole 221 and then enter the hollow chamber 14 of the housing 1, and then be discharged to the exterior of the housing 1 through the air release structure 13.

In addition, the housing 1 of the embodiment of the invention can also prevent the gas splashes generated in the contact chamber 27 from being directly discharged to the outside of the relay at the moment of discharging, so as to avoid polluting other electronic devices nearby the relay. Wherein, the gas splash is generated by the metal material of the contact assembly 3 through the high temperature ablation and volatilization of the arc.

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

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

As shown in fig. 13, fig. 13 shows an exploded view of a second embodiment of the housing 1 according to the invention. The housing 1 of the second embodiment is the same as the housing 1 of the first embodiment, and the differences are that: the slit 131 is located in the middle region in the height direction of the housing 1.

As shown in fig. 14, fig. 14 shows an exploded view of a third embodiment of the housing 1 according to the invention. The housing 1 of the third embodiment is the same as the housing 1 of the second embodiment, and the differences are that: the air release structure 13 includes a slit 131 and an air release hole 132, the slit 131 being formed in a middle region in the height direction of the housing 1, the air release hole 132 being formed on the second casing 12. The gas can exit the relay through the slit 131 and the vent 132. Of course, the vent hole 132 may be provided in the first housing 11.

As shown in fig. 15, fig. 15 shows an exploded view of a fourth embodiment of the housing 1 according to the invention. The housing 1 of the fourth embodiment is the same as the housing 1 of the above embodiment, and the difference is that: the air release structure 13 includes a slit 131 and an air release cover 133, the slit 131 being formed in a middle region in the height direction of the housing 1, the air release cover 133 being provided on the first casing 11 with an opening of the air release cover 133 facing downward. In this way, the gas can be discharged from the relay through the slit 131 and the vent cover 133, and the gas discharged from the vent cover 133 is discharged downward, without affecting other electronic devices in the vicinity of the relay.

Of course, the air release cover 133 may be provided on the second housing 12; or the first housing 11 and the second housing 12 are provided with the gas release hood 133.

As shown in fig. 16, fig. 16 shows an exploded view of a fifth embodiment of the housing 1 according to the invention. The housing 1 of the fifth embodiment is the same as the housing 1 of the above embodiment, and the difference is that: the air release structure 13 includes a slit 131 and an air release grille 134, the slit 131 being formed in a height-direction intermediate region of the housing 1, the air release grille 134 being provided on the first casing 11. Of course, the air release grille 134 may be provided on the second housing 12, or the air release grille 134 may be provided on both the first housing 11 and the second housing 12.

The gas can exit the relay through the slit 131 and the vent grill 134. When the gas passes through the air escape grille 134, the air escape grille 134 can make the flow of the gas more gentle, and the discharged gas is prevented from affecting other electronic devices nearby the relay.

It will be appreciated that the various embodiments/implementations provided by the invention may be combined with one another without conflict and are not illustrated here.

In summary, the relay according to the embodiment of the invention has the following advantages and beneficial effects:

according to the relay provided by the embodiment of the invention, the pressure relief valve assembly 5 is arranged on the ceramic cover 211 to release the overpressure gas, so that the relay is ensured not to be exploded and disassembled due to rapid expansion of the gas caused by high temperature in the chamber under the abnormal working conditions such as short circuit, overload breaking and the like of the contact assembly 3, and the reliability of a product is improved.

In addition, the shell 1 of the relay is designed to be of a non-sealing structure, so that the release gas can be timely discharged, and pollution of other electronic devices caused by release matters can be prevented.

In the inventive embodiments, the terms "first," "second," "third," and the like 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 defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the embodiments of the invention will be understood by those skilled in the art according to the specific circumstances.

In the description of the embodiments of the invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the invention and to simplify the description, and do not indicate or imply that the devices or units referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the invention.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean 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, schematic representations of the above terms 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 is only a preferred embodiment of the invention and is not intended to limit the embodiment of the invention, and various modifications and variations can be made to the embodiment of the invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 (14)

1. A relay, comprising:

the contact container comprises a ceramic cover and a first yoke plate, and a contact cavity is defined by the ceramic cover and the first yoke plate; the ceramic cover is provided with a pressure relief hole, and the pressure relief hole is communicated with the contact cavity;

the contact assembly comprises a pair of stationary contact leading-out ends and a movable reed, the stationary contact leading-out ends are arranged on the ceramic cover, and one ends of the stationary contact leading-out ends extend into the contact cavity; the movable reed is arranged in the contact cavity and is used for being driven to be respectively contacted with or separated from a pair of static contact leading-out ends; and

the pressure relief valve assembly is arranged on the ceramic cover and is used for sealing the pressure relief hole when the gas pressure in the contact cavity is smaller than a threshold value and is broken to open the pressure relief hole when the gas pressure in the contact cavity is larger than or equal to the threshold value.

2. The relay of claim 1, wherein the pressure relief valve assembly comprises a valve plate integrally provided to the ceramic cover for closing or opening the pressure relief vent.

3. The relay of claim 1, wherein the pressure relief valve assembly comprises a valve plate that is disposed separate from the ceramic cover and is disposed in the pressure relief aperture for closing or opening the pressure relief aperture.

4. A relay according to claim 3, wherein the ceramic cover has an inner wall surface and an outer wall surface, the valve plate being provided on the inner wall surface and/or the outer wall surface.

5. The relay of claim 3, wherein the pressure relief valve assembly further comprises a transition piece through which the valve plate is coupled to the ceramic cover.

6. The relay of any one of claims 2 to 5, wherein the pressure relief valve assembly further comprises a protective cover coupled to the ceramic cover and covering an outer surface of the valve plate; the protective cover has a vent.

7. The relay of claim 1, wherein the ceramic cover comprises:

the fixed contact leading-out end is arranged on the top wall;

the side wall is arranged on the edge of the top wall in a surrounding mode, extends towards the first yoke plate and is connected with the first yoke plate;

wherein the top wall and/or the side wall is/are provided with the pressure relief holes.

8. The relay of claim 1, further comprising a housing having a hollow chamber;

the contact vessel and the pressure relief valve assembly are disposed within the hollow chamber.

9. The relay of claim 8, 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 is/are provided with a gas leakage structure, and the gas leakage structure is communicated with the hollow cavity.

10. The relay of claim 9, wherein the venting structure comprises a slit formed between the first housing and the second housing.

11. Relay according to claim 9, characterized in that the venting structure comprises venting holes and/or venting hoods and/or venting grids.

12. Relay according to claim 8 or 9, characterized in that the hollow chamber communicates with the outside of the housing.

13. The relay of claim 1, wherein the structural strength of the pressure relief valve assembly is less than the structural strength of the contact receptacle.

14. The relay according to claim 1, wherein the contact container further includes a connection member, and the ceramic cover is connected to the first yoke plate through the connection member.