CN112908780B - Multiple sealing method and structure of high-voltage direct-current relay - Google Patents
Multiple sealing method and structure of high-voltage direct-current relay Download PDFInfo
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- CN112908780B CN112908780B CN202110117464.0A CN202110117464A CN112908780B CN 112908780 B CN112908780 B CN 112908780B CN 202110117464 A CN202110117464 A CN 202110117464A CN 112908780 B CN112908780 B CN 112908780B
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- 238000007789 sealing Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003292 glue Substances 0.000 claims abstract description 21
- 239000003822 epoxy resin Substances 0.000 claims abstract description 16
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 16
- 230000000903 blocking effect Effects 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 230000004888 barrier function Effects 0.000 claims description 12
- 239000002390 adhesive tape Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 5
- 238000005219 brazing Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H49/00—Apparatus or processes specially adapted to the manufacture of relays or parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention provides a multiple sealing method and structure of a high-voltage direct-current relay, and relates to the technical field of relay sealing. The multiple sealing method of the high-voltage direct-current relay comprises the step of respectively sealing the first end and the second end of the first shell of the relay twice. And after the exhaust pipe and the leading-out end at the first end are sealed and installed, a layer of glue blocking plate is covered, and then epoxy resin is filled and sealed for the second time. And after the second end protrudes below the side wall of the periphery of the first shell and is sequentially provided with the arc-shaped plate and the yoke plate for sealing and fixing, the epoxy resin is filled and sealed for the second time. The two ends of the first shell are respectively sealed twice, the sealing effect is excellent, the sealing method is simple in process and low in cost, most of elements can be replaced, and the rejection rate is extremely low. The high-voltage direct-current relay multiple sealing structure is manufactured by the high-voltage direct-current relay multiple sealing method. The structure is simple, and the sealing effect is excellent.
Description
Technical Field
The invention relates to the technical field of relay sealing, in particular to a multiple sealing method and structure of a high-voltage direct-current relay.
Background
At present, for the electrical elements with cavities such as high-voltage direct-current relays, the sealing modes mainly comprise glass sintering sealing, ceramic and metal brazing and the like. The problems of complex production process, poor sealing effect, high technical cost, high relative rejection rate and incapability of repairing exist in the above modes more or less.
Disclosure of Invention
The first objective of the present invention is to provide a multiple sealing method for a high-voltage dc relay, which aims to solve the problems of complex process, poor sealing effect, high technical cost, high relative rejection rate and no repair.
The second object of the present invention is to provide a multiple-density structure of a high-voltage direct-current relay, which aims to improve the problem of poor sealing effect.
The invention is realized in the following way:
a multiple sealing method for a high-voltage direct-current relay comprises the following steps of
Sealing the opposite first and second ends of the first housing of the relay twice respectively;
sealing and installing the exhaust pipe and the leading-out end at the first end, covering a layer of glue baffle plate, and then filling and sealing epoxy resin for secondary sealing;
and after the second end protrudes below the side wall of the periphery of the first shell and is sequentially provided with the arc-shaped plate and the yoke plate for sealing and fixing, the epoxy resin is filled and sealed for the second time.
Further, in a preferred embodiment of the present invention, the exhaust pipe is riveted to the first housing.
Further, in a preferred embodiment of the present invention, two mounting portions for mounting the exhaust pipe are provided at the first end, the two mounting portions are respectively located at the inner side and the outer side of the first housing, and the metal gaskets are respectively placed in the cavities of the two mounting portions.
Further, in a preferred embodiment of the present invention, a rubber pad is provided under the metal pad located outside the first housing.
Further, in a preferred embodiment of the present invention, the side wall, the arc shield and the yoke plate are sealed and fixed by screws.
Further, in a preferred embodiment of the present invention, a gasket and/or a rubber gasket is provided between the side wall, the arc shield and the yoke plate.
Further, in a preferred embodiment of the present invention, the glue baffle is provided with a first protrusion, and the first protrusion protrudes from the contact surface between the lead-out end and the first end.
Further, in a preferred embodiment of the present invention, the second housing of the relay is provided with a convex portion, and an end portion of the yoke plate remote from the side wall is provided with a concave portion, into which the convex portion is inserted.
Further, in a preferred embodiment of the present invention, the arc barrier is provided with an arc blocking adhesive tape.
A multi-sealing structure of a high-voltage direct-current relay is manufactured by the multi-sealing method of the high-voltage direct-current relay.
The multi-sealing method and the structure of the high-voltage direct-current relay provided by the invention have the beneficial effects that:
a multiple sealing method for a high-voltage direct-current relay comprises the step of sealing a first end and a second end of a first shell of the relay respectively twice. And after the exhaust pipe and the leading-out end at the first end are sealed and installed, a layer of glue blocking plate is covered, and then epoxy resin is filled and sealed for the second time. And after the second end protrudes below the side wall of the periphery of the first shell and is sequentially provided with the arc-shaped plate and the yoke plate for sealing and fixing, the epoxy resin is filled and sealed for the second time. The two ends of the first shell are respectively sealed twice, the two ends are double-sealed, the sealing effect is excellent, the sealing method is simple in process and low in cost, most of elements can be replaced, and the rejection rate is extremely low.
A multi-sealing structure of a high-voltage direct-current relay is manufactured by the multi-sealing method of the high-voltage direct-current relay. The structure is simple, and the sealing effect is excellent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a first view angle of a multiple sealing structure of a high-voltage direct-current relay according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second view angle of a multiple sealing structure of a high-voltage dc relay according to an embodiment of the present invention;
FIG. 3 is a section A-A of FIG. 2;
fig. 4 is a section B-B of fig. 2.
Icon: 110-a first housing; 111-a first end; 111 A-A mounting portion; 112-a second end; 113-an exhaust pipe; 114-a lead-out terminal; 115-a glue baffle; 115 A-A first bump; 116-side walls; 116 a-boss; 117-arc baffles; 118-yoke plates; 118 a-recesses; 119-metal shims; 120-rubber pads; 121-enclosing wall; 122-O-shaped ring; 123-sealing rings; 124-rubber flat pad; 125-screw; 130-a second housing; 131-convex.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Examples
As shown in fig. 1-4, the present embodiment provides a multiple sealing method and structure of a high-voltage dc relay. The embodiment is mainly a technology for sealing a contact cavity of a high-voltage direct-current relay special for a new energy automobile and sealing an exhaust pipe.
Specifically, the multiple sealing method includes sealing the opposite first and second ends 111 and 112 of the first housing 110 of the relay twice, respectively. In this embodiment, the first housing 110 is a ceramic structure with a cavity. The ceramic cavity has arc isolation function and is nonpolar. The first end 111 and the second end 112 are upper and lower ends of the first housing 110 in the height direction, respectively.
The method for sealing the first end 111 is as follows: the exhaust pipe 113 and the leading-out end 114 positioned at the first end 111 are sealed and installed, then a layer of glue baffle 115 is covered, and then epoxy resin is filled and sealed for the second time. It can be understood that the exhaust pipe 113 and the outlet end 114 are initially sealed, and then a layer of glue blocking plate 115 is covered on the surface of the exhaust pipe 113 and the outlet end 114 contacting the first housing 110, and because the exhaust pipe 113, the outlet end 114, the first housing 110 and the glue blocking plate 115 are all fixed structures with more or less certain gaps therebetween, the sealing effect can be enhanced by covering a layer of glue blocking plate 115 and then encapsulating the epoxy resin with fluidity.
The second end 112 is sealed by: the second end 112 protrudes below the side wall 116 of the circumference of the first housing 110, and is sealed and fixed by adding an arc barrier 117 and a yoke plate 118 in sequence, and then is sealed and fixed by encapsulating epoxy resin for a second time. That is, the side wall 116, the arc-shaped plate 117 and the yoke plate 118 are initially sealed and fixed, and then the epoxy resin with fluidity is filled and sealed between the gaps of the side wall 116, the arc-shaped plate 117 and the yoke plate, so that the sealing effect is further enhanced.
In view of the above, the two ends of the first housing 110 are sealed twice respectively, and the two ends are sealed in double, so that the sealing method has the advantages of simple process, low cost, and very low rejection rate, and most of the components (such as the first housing 110 and the exhaust pipe 113) can be replaced.
Further, in the present embodiment, as shown in fig. 4, the preliminary sealing method of the exhaust pipe 113 is: the exhaust pipe 113 is riveted to the first housing 110. Specifically, two mounting portions 111a for mounting the exhaust pipe 113 are provided at the first end 111, the two mounting portions 111a are located on the inner and outer sides of the first housing 110, respectively, and metal gaskets 119 are placed in the cavities of the two mounting portions 111a, respectively. Preferably, a high temperature resistant rubber pad 120 is also provided under the metal gasket 119 located outside the first housing 110. The specific operation here is: the exhaust pipe 113 is pressed against the metal gasket 119 located at the outside and then pressed together against the rubber gasket 120, and after being installed in the first housing 110, the metal gasket 119 located at the inside is installed for taper riveting. The method can firmly fix the exhaust pipe 113, and achieve the primary sealing effect through the deformation of the rubber pad 120 (the leakage into the first shell 110 during the later glue filling process can be prevented). In the present embodiment, the metal gasket 119 located inside the first housing 110 can prevent stress from damaging the first housing 110 of the ceramic structure when the exhaust pipe 113 is spread-riveted. The mounting portion 111a located inside the first case 110 has a fence 121, and the fence 121 can prevent the high arc temperature from locally stressing the exhaust pipe 113, and damaging the sealing effect of the cut of the exhaust pipe 113.
In this embodiment, as shown in fig. 3, the number of the terminals 114 is 2, and the primary sealing method of the terminals 114 is as follows: an O-ring 122 is added to the surface of the terminal 114 that contacts the first housing 110. Preferably, the glue baffle 115 is provided with a first protrusion 115a, and the first protrusion 115a protrudes from the contact surface between the lead-out end 114 and the first end 111. At this time, not only the mounting strength but also the sealing effect is further enhanced. In this embodiment, the lead-out terminal 114 is used as an external reed and is directly connected with an external load to drive other functional components to start the working mode or stop working state.
Further, in the present embodiment, as shown in fig. 3, the preliminary sealing method of the side wall 116, the arc barrier 117, and the yoke plate 118 is as follows: the side wall 116, the arc shield 117, and the yoke plate 118 are sealed and fixed by screws 125. In other embodiments, the side wall 116, the arc-shaped plate 117 and the yoke plate 118 may be sealed and fixed by, for example, bonding, and preferably, a sealing ring 123 and/or a rubber gasket 124 are provided between the side wall 116, the arc-shaped plate 117 and the yoke plate 118. That is, only the seal ring 123 may be provided or the seal ring 123 (mainly an O-ring) and the rubber flat pad 124 may be provided at the same time, and the seal effect may be further enhanced by the seal ring 123 and/or the rubber flat pad 124. Further, the portion of the flash barrier 117 adjacent to the screw 125 is raised by a threaded length.
The arc-shaped plate 117 is also provided with a second bulge which fills the gap between the side wall 116, the arc-shaped plate 117 and the yoke plate 118, so that the arc-shaped plate 117 is prevented from deforming when the screw 125 is locked, the rubber flat pad 124 is convenient to place, and the second bulge also has the function of reinforcing the arc-shaped plate 117 to play a role of slightly isolating arcs.
Further, referring again to fig. 3, the second housing 130 of the relay is provided with a protrusion 131, an end of the yoke plate 118 remote from the side wall 116 is provided with a recess 118a, and the protrusion 131 is inserted into the recess 118 a. The second housing 130 can be well positioned by the cooperation of the convex portion 131 and the concave portion 118a, and good movement of the product is ensured. In the present embodiment, the yoke plate 118 and the second housing 130 are welded by laser, where the deformation under load is small, sufficient to satisfy the sealing performance.
Further, the arc barrier 117 is provided with an arc blocking adhesive tape, which can prevent the arc from leaking.
In this embodiment, referring again to fig. 1, a boss 116a is further provided on the side wall 116, and a permanent magnet (in this embodiment, a house type) is placed on the boss 116 a. The location, shape and number of the bosses 116a are different depending on the relay type number. The permanent magnet is placed to generate a magnetic field, and the direction of the generated magnetic field pulls the generation direction of the electric arc between the contacts, so that the electric arc energy is separated and weakened, the loss of contact materials is further protected, and the service life of the relay is prolonged.
After the curing of the potting epoxy, the vacuum exhaust table is evacuated through the exhaust pipe 113 to be filled with nitrogen, and then the exhaust pipe 113 is cut to be sealed finally through the formed cut.
Finally, through the experiments of the inventor, the method predicts the completion time of each batch to be about 40min, wherein the manufacturing time of the second shell 130 is about 20min, which is one third of the time when the high temperature resistant material and the exhaust pipe 113 are integrally injection molded; in the method, the sealing process of the sealing structure of the exhaust pipe 113 adopts equipment such as an exhaust pipe 113 expansion riveting tool, a glue dispenser and an electrothermal blowing drying box, the total price is about 3 ten thousand, and the scheme of 'injection molding and glue injection of high-temperature resistant materials and the exhaust pipe 113 integrally' adopts equipment price which is equivalent to that of the brazing equipment of the brazing technology, but is far lower than that of the brazing equipment of the brazing technology. The method ensures the sealing performance, simultaneously greatly reduces the production cost of enterprises and the waste rate of long-term production, and has certain economic benefit. In addition, the sealing performance of the method has been proved by experiments, and the sealing cavity can maintain the inert gas pressure of 0.3MPa, so that the arc energy is effectively reduced, and the electric life of the product is prolonged.
The method is used for the sealed cavity of the airtight high-voltage direct-current relay, so that inert gas in the sealed cavity is prevented from leaking, arc energy is effectively reduced, and the electric life of a product is prolonged.
The embodiment also provides a multi-sealing structure of the high-voltage direct-current relay exhaust pipe 113, which is manufactured by using the multi-sealing method of the high-voltage direct-current relay exhaust pipe 113.
In particular, as shown in fig. 1 to 4, the multiple sealing structure includes a body including a first housing 110 and a second housing 130. The first housing 110 includes opposite first and second ends 111, 112. The first end 111 is provided with an exhaust pipe 113 and a leading-out end 114 in a sealing manner, a glue baffle 115 is arranged on the surface of the exhaust pipe 113 and the leading-out end 114, which is contacted with the first shell 110, and an epoxy resin layer is arranged in a gap among the exhaust pipe 113, the leading-out end 114 and the glue baffle 115. The second end 112 is provided with a side wall 116, the side wall 116 protrudes out of the circumference of the first shell 110, and an arc-shaped baffle 117 and a yoke plate 118 are sequentially and hermetically arranged at the end part of the side wall 116, which is far away from the first shell 110; the gaps between the side walls 116, the arc-shield plates 117, and the yoke plates 118 have an epoxy resin layer.
Wherein the exhaust pipe 113 is riveted to the inner wall of the first housing 110. The first end 111 has a mounting portion 111a to which the exhaust pipe 113 is mounted, the mounting portion 111a including two mounting portions 111a located respectively on the inner and outer sides of the first housing 110, both mounting portions 111a having mounting cavities, both mounting cavities having metal gaskets 119. A rubber pad 120 is provided under the outer metal pad 119. The side wall 116, the arc shield 117, and the yoke plate 118 are sealed and fixed by screws 125. A seal ring 123 and a rubber flat pad 124 are also provided between the side wall 116, the arc shield 117 and the yoke plate 118. The arc barrier 117 is provided with a second protrusion filling the slit. The glue baffle 115 is provided with a first protrusion 115a filling the gap, and the first protrusion 115a protrudes from the contact surface between the lead-out end 114 and the first end 111. The end of the yoke plate 118 remote from the side wall 116 has a recess 118a, and the second housing 130 has a protrusion 131 that mates with the recess 118 a. The arc barrier 117 is provided with an arc barrier strip. The multiple seal structure who sets up like this is simple and sealed effect splendid.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The multiple sealing method for the high-voltage direct-current relay is characterized by comprising the following steps of
Sealing the opposite first and second ends of the first housing of the relay twice respectively;
sealing and installing the exhaust pipe and the leading-out end at the first end, covering a layer of glue baffle plate, and then filling and sealing epoxy resin for secondary sealing;
the second end protrudes below the side wall of the periphery of the first shell, an arc-isolating plate and a yoke plate are sequentially added to be fixed in a sealing mode, and then epoxy resin is filled in the second end for secondary sealing;
the side wall, the arc-shaped baffle plate and the yoke plate are sealed and fixed by bolts, and sealing rings and/or rubber flat gaskets are arranged among the side wall, the arc-shaped baffle plate and the yoke plate;
the glue baffle plate is provided with a first bulge, and the first bulge protrudes out of the contact surface of the leading-out end and the first end;
the second housing of the relay is provided with a convex portion, an end portion of the yoke plate, which is far away from the side wall, is provided with a concave portion, and the convex portion is inserted into the concave portion.
2. The method of multiple sealing a high voltage dc relay of claim 1, wherein the exhaust pipe is riveted to the first housing.
3. The multiple sealing method of a high voltage direct current relay according to claim 2, wherein two mounting parts for mounting the exhaust pipe are arranged at the first end, the two mounting parts are respectively positioned on the inner side and the outer side of the first shell, and metal gaskets are respectively placed in cavities of the two mounting parts.
4. A method of multiple sealing a high voltage dc relay according to claim 3, wherein a rubber gasket is provided under the metal gasket located outside the first housing.
5. The method for multiple sealing of a high voltage direct current relay according to claim 1, wherein the arc barrier is provided with an arc barrier adhesive tape.
6. The high-voltage direct-current relay multiple sealing structure is characterized by comprising a body, wherein the body comprises a first shell and a second shell, and the first shell comprises a first end and a second end which are opposite;
the first end is provided with an exhaust pipe and a leading-out end in a sealing way, the surfaces of the exhaust pipe and the leading-out end, which are contacted with the first shell, are provided with glue blocking plates, and gaps among the exhaust pipe, the leading-out end and the glue blocking plates are provided with epoxy resin layers;
the second end is provided with a side wall, the side wall protrudes out of the periphery of the first shell, and the end part of the side wall, which is far away from the first shell, is sequentially provided with an arc barrier and a yoke plate in a sealing way; gaps among the side walls, the arc-shaped baffles and the yoke plates are provided with epoxy resin layers; the exhaust pipe is riveted with the inner wall of the first shell;
the first end is provided with a mounting part for mounting the exhaust pipe, the mounting part comprises two mounting parts which are respectively positioned at the inner side and the outer side of the first shell, the two mounting parts are respectively provided with a mounting cavity, the two mounting cavities are respectively provided with a metal gasket, a rubber pad is arranged below the metal gasket positioned at the outer part, the side wall, the arc-shaped baffle plate and the yoke plate are fixed in a sealing way through screws, and a sealing ring and a rubber flat pad are arranged among the side wall, the arc-shaped baffle plate and the yoke plate;
the flash barrier is provided with a second bulge for filling the gap, the glue baffle is provided with a first bulge for filling the gap, the first bulge protrudes out of the contact surface between the leading-out end and the first end, the end part of the yoke iron plate far away from the side wall is provided with a concave part, and the second shell is provided with a convex part matched with the concave part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110117464.0A CN112908780B (en) | 2021-01-28 | 2021-01-28 | Multiple sealing method and structure of high-voltage direct-current relay |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110117464.0A CN112908780B (en) | 2021-01-28 | 2021-01-28 | Multiple sealing method and structure of high-voltage direct-current relay |
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| Publication Number | Publication Date |
|---|---|
| CN112908780A CN112908780A (en) | 2021-06-04 |
| CN112908780B true CN112908780B (en) | 2024-03-19 |
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| CN202110117464.0A Active CN112908780B (en) | 2021-01-28 | 2021-01-28 | Multiple sealing method and structure of high-voltage direct-current relay |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115458367B (en) * | 2022-11-09 | 2023-04-11 | 浙江英洛华新能源科技有限公司 | Contact portion sealing structure of relay |
| CN115458368B (en) * | 2022-11-09 | 2023-04-28 | 浙江英洛华新能源科技有限公司 | Metal shell and yoke plate fixing structure of relay |
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| CN112908780A (en) | 2021-06-04 |
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