Relay

Abstract

Disclosed is a relay. The relay comprises: an arc extinguishing cover, a magnetic pole piece and a sleeve. The arc extinguishing cover and the sleeve are fixedly disposed at two sides of the magnetic pole piece, respectively, and a sealing space allowing a movable contact assembly of the relay to move is formed between the arc extinguishing cover, the magnetic pole piece and the sleeve. Any one of the arc extinguishing cover, the magnetic pole piece and the sleeve is provided with a vent hole in communication with the sealing space, and a sealing assembly is mounted in the vent hole. The sealing assembly comprises a steel ball and a sealing sleeve, the steel ball being embedded in the sealing sleeve so as to have an interference fit, the sealing sleeve being embedded in the vent hole so as to have an interference fit, and the sealing sleeve being deformed under extrusion of the steel ball and the inner wall of the vent hole, so as to be tightly attached to the inner wall of the vent hole. The present invention, by means of using the steel ball and the sealing sleeve to jointly seal the vent hole, can increase sealing reliability, and only one sealing point position needs to be considered, effectively ensuring the air tightness of the sealing space, and guaranteeing the electrical life of the product; the process is simple, production efficiency is improved, and costs are reduced.

Description

relay Technical Field

[0001] The present invention relates to the technical field of electric control devices, in particular to a relay. Background Art

[0002] At present, in order to prevent arc burning when the dynamic and static contacts of existing relays are disconnected, the mainstream practice is to fill the relay with a protective gas such as hydrogen H2. This requires a sealed space inside the relay to meet a certain airtightness. The sealed space of the relay is usually formed by the sealed connection of a ceramic cover, a magnetic pole piece and a sleeve.

[0003] In order to fill the sealed space with protective gas, as shown in Figure 1, the existing design is as follows: a vent is provided on the lower surface of the pole piece to connect with the exhaust pipe 12, and a solder ring 13 is provided between the vent of the pole piece and the exhaust pipe 12. When heated at high temperature, the solder ring 13 melts and fills the gap at the connection between the two, making it a sealed connection; the protective gas is inflated into the sealed space through the exhaust pipe 12. When the inflation is completed, the exhaust pipe 12 is clamped to ensure the sealing of the sealed space. The existing design has the following defects: 1. It is necessary to ensure not only the sealing of the connection between the exhaust pipe 12 and the magnetic pole piece, but also the sealing of the jaws of the exhaust pipe 12. The airtightness is unstable and sealing failure is prone to occur, affecting the electrical life of the product; 2. The process is complicated and the cost is high. A ring-shaped solder ring 13 is required, which is complicated to form. The material of the solder ring 13 is usually silver-copper 28, which is expensive; 3. The thickness of the solder ring 13 is difficult to control. Too little solder can easily lead to cold solder joints, affecting the sealing reliability. Too much solder can easily cause solder creep, causing waste and affecting the final airtightness.

[0004] As the voltage levels of electric vehicles and charging systems continue to increase, higher requirements are placed on the stability and safety of relays. The sealing inside the relay is a key indicator of relay quality. If the seal fails, it will seriously affect the product's electrical life and even cause a major safety accident. Therefore, it is necessary to improve the existing technology to overcome its shortcomings.

[0005] Summary of the Invention

[0006] The problem to be solved by the present invention is to provide a relay to overcome the defects of the existing relay sealing structure, such as multiple sealing points requiring attention, complex sealing process, unstable airtightness and high cost.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a relay, comprising: an arc extinguishing hood, a pole piece and a sleeve, the arc extinguishing hood and the sleeve are respectively fixed on both sides of the pole piece, and a sealed space for the movable contact component of the relay is formed between the arc extinguishing hood, the pole piece and the sleeve; any one of the arc extinguishing hood, the pole piece and the sleeve is provided with a vent connected to the sealed space, and a sealing assembly is installed in the vent, the sealing assembly comprises a steel ball and a sealing sleeve, the steel ball is interference-embedded in the sealing sleeve, the sealing sleeve is interference-embedded in the vent, and the sealing sleeve is deformed under the squeezing of the steel ball and the inner wall of the vent so as to fit tightly to the inner wall of the vent.

[0008] As a further improvement of the present invention, a stop step is provided in the vent hole, and the sealing sleeve abuts against the stop step.

[0009] As a further improvement of the present invention, a blind hole is provided in the sealing sleeve, the port of the blind hole is arranged in a direction away from the sealing space, the diameter of the steel ball is larger than the inner diameter of the blind hole, and the steel ball is interference-embedded in the blind hole along the port of the blind hole by physical pressing.

[0010] As a further improvement of the present invention, in the initial state, that is, when the sealing sleeve is not pressed into the vent hole,

[0011] The steel ball is partially fixedly pressed on the end of the sealing sleeve so that the steel ball and the sealing sleeve are fixedly connected together as an assembly;

[0012] Alternatively, the steel ball and the sealing sleeve are two separate parts.

[0013] As a further improvement of the present invention, the vent hole and the sealing sleeve are both circular, and the outer diameter of the sealing sleeve is larger than the inner diameter of the vent hole. The sealing sleeve is interference fit in the vent hole by physical pressing.

[0014] As a further improvement of the present invention, a plurality of annular protrusions are arranged axially on the outer circumferential surface of the sealing sleeve. When the steel ball and the sealing sleeve are pressed into the vent hole, the plurality of annular protrusions are squeezed and deformed and fit tightly against the inner wall of the vent hole.

[0015] As a further improvement of the present invention, the cross-section of several of the annular protrusions along the axial direction of the sealing sleeve is serrated, and the projections of several of the annular protrusions along the radial direction of the sealing sleeve can fall on the inner wall of the blind hole, so that when the steel ball is pressed into the blind hole, it can cooperate with the inner wall of the vent hole to squeeze the annular protrusion to produce deformation.

[0016] As a further improvement of the present invention, the sealing sleeve and the vent hole are connected by secondary sealing through welding or dispensing technology.

[0017] As a further improvement of the present invention, the port of the blind hole is provided with a first chamfer along the edge; and the end of the vent hole away from the sealed space is provided with a second chamfer along the edge.

[0018] As a further improvement of the present invention, the vent hole is provided on the pole piece, and the pole piece is provided with an annular boss extending the depth of the vent hole.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a relay, the sealed space of the relay is composed of corresponding sealed connections of an arc extinguishing cover, a magnetic pole piece and a sleeve, and sealing is achieved by providing an air vent on any one of the arc extinguishing cover, the magnetic pole piece and the sleeve, and interference fitting a steel ball and a sealing sleeve in the air vent, which can improve the reliability of the seal, and only one sealing point needs to be considered, effectively ensuring the airtightness of the sealed space and protecting the electrical life of the product. At the same time, the design simplifies the sealing process, is more suitable for automated production, improves production efficiency, and reduces processing costs and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a perspective view of a conventional magnetic pole piece sealing structure;

[0021] FIG2 is a perspective view of a first embodiment of a relay according to the present invention;

[0022] FIG3 is a cross-sectional view of a first embodiment of a relay according to the present invention;

[0023] FIG4 is an enlarged view of A in FIG3 of the present invention;

[0024] FIG5 is a perspective view of a pole piece of a relay according to a first embodiment of the present invention;

[0025] FIG6 is a perspective view of a sealing sleeve of a relay according to the present invention;

[0026] FIG7 is a second perspective view of the sealing sleeve of the relay of the present invention;

[0027] FIG8 is a perspective view of a steel ball and a sealing sleeve of a relay of the present invention fixedly connected as an assembly;

[0028] FIG9 is a cross-sectional view of a second embodiment of a relay according to the present invention;

[0029] FIG10 is a perspective view of a third embodiment of a relay according to the present invention, wherein the sealing component is decomposed;

[0030] FIG11 is a cross-sectional view of the assembly of the sealing assembly and the magnetic pole piece of the relay embodiment 3 of the present invention;

[0031] FIG12 is a cross-sectional view of the assembly of the sealing assembly and the magnetic pole piece of the relay embodiment 4 of the present invention;

[0032] FIG13 is a perspective view of a fifth embodiment of a relay according to the present invention;

[0033] FIG14 is a cross-sectional view of a fifth embodiment of a relay according to the present invention;

[0034] FIG15 is an enlarged view of B in FIG14 of the present invention;

[0035] FIG16 is a perspective view of the arc extinguishing cover of the fifth embodiment of the relay of the present invention;

[0036] FIG17 is a perspective view of a sixth embodiment of a relay according to the present invention.

[0037] The following description is made with reference to the accompanying drawings:

[0038] 1. Arc extinguishing cover; 100. Vent hole; 101. Second chamfer; 102. Stop step; 2. Pole piece; 201. Annular boss; 3. Sleeve; 4. Steel ball; 5. Sealing sleeve; 501. Blind hole; 502. Annular protrusion; 503. First chamfer; 6. Connecting ring; 7. Static contact; 8. Moving contact; 9. Push rod assembly; 10. Moving iron core; 11. Static iron core; 12. Exhaust pipe; 13. Solder ring. DETAILED DESCRIPTION

[0039] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] 2 to 7 , the present invention provides a relay including an arc extinguishing cover 1 , a magnetic pole piece 2 , a sleeve 3 and a moving contact assembly.

[0042] Among them, the arc extinguishing cover 1 can be made of ceramic material, and its bottom is sealed and welded to the top of the magnetic pole piece 2 through a connecting ring 6, and two static contacts 7 are sealed and fixed side by side on the top of the arc extinguishing cover 1, and the lower ends of the two static contacts 7 extend downward into the cavity of the arc extinguishing cover 1.

[0043] Furthermore, the moving contact assembly includes a moving contact piece 8, a push rod assembly 9, and a moving iron core 10. The moving contact piece 8 is mounted on the upper end of the push rod assembly 9 and is located in the cavity of the arc extinguishing cover 1. The moving contact piece 8 is arranged opposite the two static contacts 7. A through hole is provided in the middle of the pole piece 2. The push rod of the push rod assembly 9 vertically passes through the through hole of the pole piece 2 and is fixedly connected to the moving iron core 10 below. In addition, a static iron core 11 is fixed to the bottom of the pole piece 2. The static iron core 11 is sleeved on the outside of the push rod of the push rod assembly 9 and is located directly above the moving iron core 10.

[0044] Furthermore, the sleeve 3 is cup-shaped with a bottom but no top, and has a flanged edge around its upper end. The sleeve 3 is fitted over the movable iron core 10 and the stationary iron core 11 and is welded to the bottom of the pole piece 2 via the flanged edge. This creates a sealed space between the arc extinguishing hood 1, the pole piece 2, and the sleeve 3, allowing the movable contact assembly of the relay to move. This sealed space is used to be filled with protective gas.

[0045] Referring to Figures 2 to 5, the pole piece 2 is provided with a vent hole 100 connected to the sealed space. The vent hole 100 is arranged along the thickness direction of the pole piece 2 (i.e., the vertical direction with reference to Figure 3), and the upper and lower ends of the vent hole 100 pass through the top and bottom surfaces of the pole piece 2.

[0046] As one of the important improvements of the present application, the pole piece 2 is installed with a sealing assembly in the vent 100. The sealing assembly includes a steel ball 4 and a sealing sleeve 5. The steel ball 4 is interference fit in the sealing sleeve 5, and the sealing sleeve 5 is interference fit in the vent 100. The sealing sleeve 5 is deformed under the pressure of the steel ball 4 and the inner wall of the vent 100 to fit tightly against the inner wall of the vent 100, thereby sealing the vent 100. The present invention abandons the traditional sealing method using exhaust pipe jaws and adopts a new idea, that is, the steel ball 4 and the sealing sleeve 5 are used in combination to seal the vent 100, which can improve the reliability of the seal and only needs to consider one sealing point, effectively ensuring the airtightness of the sealed space and protecting the electrical life of the product. At the same time, this design also simplifies the sealing process and reduces processing and material costs.

[0047] As shown in Figures 5 and 6 , the vent hole 100 and the sealing sleeve 5 in this application are both circular, and a circular design is more conducive to achieving a seal. More specifically, the sealing sleeve 5 is cylindrical, with one end closed and the other open. Furthermore, a blind hole 501 is formed inside the sealing sleeve 5 , with the end of the blind hole 501 facing away from the sealed space (i.e., vertically downward, referring to Figure 3 ).

[0048] The diameter of the steel ball 4 is larger than the inner diameter of the blind hole 501, and the steel ball 4 is inserted into the blind hole 501 by physical pressure along the end of the blind hole 501. The outer diameter of the sealing sleeve 5 is larger than the inner diameter of the vent hole 100, and the sealing sleeve 5 is inserted into the vent hole 100 by physical pressure.

[0049] In addition, as shown in FIG4 and FIG5, the vent hole 100 is provided with a stop step 102 along the inner wall at one end close to the sealed space. The stop step 102 may be, but is not limited to, annular. One end of the sealing sleeve 5 abuts against the stop step 102.

[0050] In the initial state, that is, when the steel ball 4 and the sealing sleeve 5 are not pressed into the vent hole 100, the steel ball 4 and the sealing sleeve 5 are two separate parts. After the protective gas is filled into the sealed space through the vent hole 100, the sealing sleeve 5 is placed at the end of the vent hole 100 away from the sealed space, and the steel ball 4 is placed at the end of the blind hole 501 of the sealing sleeve 5. An external press is used to press the steel ball 4 and the sealing sleeve 5 together into the vent hole 100 of the pole piece 2 until the steel ball 4 is pressed into the blind hole 501 and the sealing sleeve 5 abuts the stop step 102. During the pressing process, the steel ball 4 cooperates with the inner wall of the vent hole 100 to continuously press the sealing sleeve 5, causing the sealing sleeve 5 to deform and fit tightly against the inner wall of the vent hole 100, thereby sealing the vent hole 100. By adopting this structural design, the present application presses the steel ball 4 and the sealing sleeve 5 into the vent hole 100 in one step to achieve sealing. The process is simple, more suitable for automated production, and improves production efficiency. The sealing sleeve 5 is stopped by the stop step 102, which can ensure that the sealing sleeve 5 and the steel ball 4 are pressed into place.

[0051] As shown in FIG8 , of course, in other embodiments of the present invention, in the initial state, that is, when the steel ball 4 and the sealing sleeve 5 are not pressed into the vent hole 100, a part (for example, half) of the steel ball 4 can also be fixed and crimped to the end of the blind hole 501 of the sealing sleeve 5 in advance, so that the steel ball 4 and the sealing sleeve 5 are an assembly fixed together. This method makes it easier to press the assembly into the vent hole 100 later and is easy to produce.

[0052] In addition, the present invention can also perform a secondary sealing connection between the sealing sleeve 5 and the vent hole 100 through welding (such as laser welding) or a dispensing process to further improve the sealing performance.

[0053] It is worth mentioning that, as shown in Figures 4 and 7, the present application has a plurality of annular protrusions 502 arranged axially on the outer circumference of the sealing sleeve 5. The cross-section of the annular protrusions 502 along the axial direction of the sealing sleeve 5 is sawtooth-shaped, and the projections of the annular protrusions 502 along the radial direction of the sealing sleeve 5 can fall on the inner wall of the blind hole 501. As the steel ball 4 and the sealing sleeve 5 are pressed into the vent hole 100 together, as the steel ball 4 continues to advance into the blind hole 501 of the sealing sleeve 5, the inner diameter of the blind hole 501 is forced to expand outward, and the steel ball 4 cooperates with the inner wall of the vent hole 100 to continuously squeeze the annular protrusions 502, causing them to deform and tightly engage with the inner wall of the vent hole 100. Each annular protrusion 502 can achieve a seal with the inner wall of the vent hole 100, and the multiple annular protrusions 502 can form a multiple seal, further improving the reliability of the seal.

[0054] 8 , a first chamfer 503 is provided along the edge of the blind hole 501 . The first chamfer 503 is used to guide and position the steel ball 4 for assembly.

[0055] Similarly, as shown in FIG5 , a second chamfer 101 is provided along the edge of the other end of the vent hole 100 away from the sealed space. The second chamfer 101 is used to guide and position the sealing sleeve 5 for assembly, so as to facilitate alignment and press-in.

[0056] Optionally, the thickness of the pole piece 2 is 3 mm to 4 mm to ensure that the pole piece 2 has sufficient strength to support the subsequent pressing of the steel ball 4 and the sealing sleeve 5. The overall thickness of the pole piece 2 is greater than or equal to the thickness of the sealing sleeve 5, that is, the depth of the vent hole 100 on the pole piece 2 is also greater than or equal to the thickness of the sealing sleeve 5, so that the sealing sleeve 5 can be completely pressed into the vent hole 100 of the pole piece 2.

[0057] Optionally, the depth of the blind hole 501 of the sealing sleeve 5 is also greater than or equal to the diameter of the steel ball 4 , so that the steel ball 4 can be completely pressed into the blind hole 501 of the sealing sleeve 5 .

[0058] Optionally, the diameter of the steel ball 4 is 1.5 mm to 3.5 mm, the diameter of the sealing sleeve 5 is 2 mm to 4 mm, the wall thickness of the sealing sleeve 5 is 0.2 mm to 0.5 mm, and the inner diameter of the vent hole 100 is 2 mm to 3 mm. Preferably, in this embodiment, the thickness of the pole piece 2 is 3.5 mm, the diameter of the steel ball 4 is 2 mm, the diameter of the sealing sleeve 5 is 2.3 mm, the wall thickness of the sealing sleeve 5 is 0.2 mm, the inner diameter of the vent hole 100 is 2.1 mm, and the thickness of the stop step 102 is 1 mm.

[0059] Optionally, the steel ball 4 is made of high-carbon chromium bearing steel, and the pole piece 2 is made of an alloy material of type 4J33.

[0060] Referring to FIG3 , the relay of the present application further includes a coil winding (not shown in the figure). It should be noted that the coil winding and the movable contact assembly in the present application all adopt existing conventional technology. The coil winding is sleeved on the outside of the sleeve 3. When the coil winding is energized, it can magnetize the static iron core 11 and the movable iron core 10. The movable iron core 10 is attracted by the static iron core 11 and moves upward. The movable contact piece 8 is pushed upward by the push rod assembly 9, so that the movable contact piece 8 contacts and conducts with the two static contacts 7. When the coil winding is de-energized, the magnetic attraction between the movable iron core 10 and the static iron core 11 disappears. Under the action of the reset spring between the movable iron core 10 and the static iron core 11, the movable iron core 10 moves downward and is disconnected from the two static contacts 7 by the push rod assembly 9 with the movable contact piece 8.

[0061] Example 2

[0062] Referring to FIG9 , the difference between this embodiment and the first embodiment is that the design of the non-stop step 102 in the vent hole 100 controls the depth of the steel ball 4 and the sealing sleeve 5 pressed into the vent hole 100 by controlling the forward advancement distance of the external press, thereby ensuring that the steel ball 4 and the sealing sleeve 5 are pressed into place to achieve sealing.

[0063] Example 3

[0064] Referring to Figures 10 and 11 , this embodiment differs from the first embodiment in that the thickness of the pole piece 2 in this embodiment is reduced compared to that of the first embodiment, further saving material costs. Furthermore, to ensure the local strength around the vent hole 100 of the pole piece 2, this embodiment provides an annular boss 201 at the bottom of the pole piece 2, located at the vent hole 100. This boss 201 extends the depth of the vent hole 100 and enhances the local strength around the vent hole 100 of the pole piece 2, thereby supporting the subsequent insertion of the steel ball 4 and the sealing sleeve 5.

[0065] In this embodiment, optionally, the thickness of the pole piece 2 excluding the annular boss 201 is 2 mm to 3 mm, preferably 2 mm; the thickness of the annular boss 201 is 2 mm to 3 mm, preferably 1.5 mm, wherein the thickness of the stop step in the vent hole 100 is 1.5 mm.

[0066] Example 4

[0067] Referring to Figure 12, the difference between this embodiment and the third embodiment is that the design of the non-stop step 102 in the vent hole 100 controls the depth of the steel ball 4 and the sealing sleeve 5 pressed into the vent hole 100 by controlling the forward advancement distance of the external press, thereby ensuring that the steel ball 4 and the sealing sleeve 5 are pressed into place to achieve sealing.

[0068] Example 5

[0069] Referring to Figures 13 to 16 , this embodiment differs from the first embodiment in that the vent holes 100 are provided on the arc extinguishing cover 1 , while the pole piece 2 of this embodiment does not have vent holes 100 . Furthermore, the thickness of the pole piece 2 of this embodiment can be reduced compared to that of the first embodiment. Other components of the relay are the same as those of the first embodiment.

[0070] In this embodiment, the vent hole 100 may be, but is not limited to, vertically disposed at the top of the arc extinguishing hood 1. The arc extinguishing hood 1 may be made of ceramic. A second chamfer 101 is provided along the upper edge of the vent hole 100 to guide the sealing sleeve 5 during assembly and facilitate alignment and press-fitting. Similarly, a stop step 102 is provided along the inner wall of the lower end of the vent hole 100.

[0071] Furthermore, the wall thickness of the arc chute 1 is 3 mm to 4 mm, preferably 3.5 mm, to ensure that the arc chute 1 has sufficient strength to support the subsequent pressing of the steel ball 4 and the sealing sleeve 5. The wall thickness of the arc chute 1 is greater than or equal to the thickness of the sealing sleeve 5. In other words, the depth of the vent hole 100 on the arc chute 1 is also greater than or equal to the thickness of the sealing sleeve 5, so that the sealing sleeve 5 can be completely pressed into the vent hole 100 of the arc chute 1.

[0072] After the protective gas is filled into the sealed space through the vent 100 of the arc extinguishing cover 1, the sealing sleeve 5 is placed on the upper end of the vent 100 of the arc extinguishing cover 1, and the port of the blind hole 501 of the sealing sleeve 5 is arranged upward, and at the same time, the steel ball 4 is placed at the port of the blind hole 501 of the sealing sleeve 5, and the steel ball 4 and the sealing sleeve 5 are pressed into the vent 100 of the arc extinguishing cover 1 together by an external press until the steel ball 4 is pressed into the blind hole 501 and the sealing sleeve 5 rests on the stop step 102; during the pressing process, the steel ball 4 cooperates with the inner wall of the vent 100 of the arc extinguishing cover 1 to continuously squeeze the sealing sleeve 5, causing the sealing sleeve 5 to deform and fit tightly against the inner wall of the vent 100, thereby achieving sealing of the vent 100.

[0073] Example 6

[0074] Referring to Figure 17, the difference between this embodiment and the fifth embodiment is that the design of the non-stop step 102 in the vent hole 100 controls the depth of the steel ball 4 and the sealing sleeve 5 pressed into the vent hole 100 by controlling the forward advancement distance of the external press, thereby ensuring that the steel ball 4 and the sealing sleeve 5 are pressed into place to achieve sealing.

[0075] Example 7

[0076] The difference between this embodiment and the first embodiment is that the vent hole 100 is provided on the sleeve 3, while the pole piece 2 of this embodiment does not have the vent hole 100, and the thickness of the pole piece 2 of this embodiment can be reduced compared to the thickness of the pole piece 2 of the first embodiment. Other components of the relay are the same as those of the first embodiment.

[0077] Furthermore, to ensure that the sleeve 3 has sufficient strength to support the subsequent pressing of the steel ball 4 and the sealing sleeve 5, the overall thickness of the sleeve 3 can be increased, or the thickness of the bottom of the sleeve 3 can be increased to meet the requirements. In this embodiment, the vent hole 100 can be, but is not limited to, provided vertically at the bottom of the sleeve 3, and a stop step 102 is also provided in the vent hole 100.

[0078] After the protective gas is filled into the sealed space through the vent hole 100 of the sleeve 3, the sealing sleeve 5 is placed at the lower end of the vent hole 100 of the sleeve 3, and the port of the blind hole 501 of the sealing sleeve 5 is arranged downward. At the same time, the steel ball 4 is placed at the port of the blind hole 501 of the sealing sleeve 5, and the steel ball 4 and the sealing sleeve 5 are pressed into the vent hole 100 of the sleeve 3 by an external press until the steel ball 4 is pressed into the blind hole 501 and the sealing sleeve 5 rests on the stop step 102; during the pressing process, the steel ball 4 cooperates with the inner wall of the vent hole 100 of the sleeve 3 to continuously squeeze the sealing sleeve 5, causing the sealing sleeve 5 to deform and fit tightly against the inner wall of the vent hole 100, thereby achieving sealing of the vent hole 100.

[0079] Optionally, the sleeve 3 is made of stainless steel.

[0080] In summary, the present invention provides a relay, the sealed space of the relay is composed of the arc extinguishing cover 1, the pole piece 2 and the sleeve 3 correspondingly sealed and connected, and the air vent 100 is provided on any one of the arc extinguishing cover 1, the pole piece 2 and the sleeve 3, and the steel ball 4 and the sealing sleeve 5 are interference-fitted in the air vent 100 to achieve sealing, which can improve the reliability of the sealing, and there is only one sealing point to be considered, which effectively ensures the airtightness of the sealed space and guarantees the electrical life of the product. At the same time, the design simplifies the sealing process, is more suitable for automated production, improves production efficiency, and reduces processing costs and material costs.

[0081] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A relay comprising an arc extinguishing hood (1), a magnetic pole piece (2) and a sleeve (3), wherein the arc extinguishing hood (1) and the sleeve (3) are respectively fixed on both sides of the magnetic pole piece (2), and a sealed space for the movable contact component of the relay is formed between the arc extinguishing hood (1), the magnetic pole piece (2) and the sleeve (3), wherein: Any one of the arc extinguishing cover (1), the magnetic pole piece (2) and the sleeve (3) is provided with a vent hole (100) connected to the sealed space, and a sealing component is installed in the vent hole (100), the sealing component comprising a steel ball (4) and a sealing sleeve (5), the steel ball (4) is interference-embedded in the sealing sleeve (5), the sealing sleeve (5) is interference-embedded in the vent hole (100), and the sealing sleeve (5) is deformed under the compression of the steel ball (4) and the inner wall of the vent hole (100) so as to fit tightly to the inner wall of the vent hole (100).

2. The relay according to claim 1, wherein: A stop step (102) is provided in the vent hole (100), and the sealing sleeve (5) abuts against the stop step (102).

3. The relay according to claim 1 or 2, characterized in that: A blind hole (501) is provided in the sealing sleeve (5), an end of the blind hole (501) is arranged in a direction opposite to the sealing space, the diameter of the steel ball (4) is larger than the inner diameter of the blind hole (501), and the steel ball (4) is interference-embedded in the blind hole (501) along the end of the blind hole (501) in a physically pressed manner.

4. The relay according to claim 3, wherein: In the initial state, that is, when the sealing sleeve (5) is not pressed into the vent hole (100), The steel ball (4) is partially fixedly pressed on the end of the sealing sleeve (5), so that the steel ball (4) and the sealing sleeve (5) are fixed together. assembly; Alternatively, the steel ball (4) and the sealing sleeve (5) are two separate parts.

5. The relay according to claim 3, wherein: The vent hole (100) and the sealing sleeve (5) are both circular, and the outer diameter of the sealing sleeve (5) is larger than the inner diameter of the vent hole (100). The sealing sleeve (5) is interference-embedded in the vent hole (100) by physical pressing.

6. The relay according to claim 5, characterized in that: A plurality of annular protrusions (502) are arranged axially on the outer circumferential surface of the sealing sleeve (5); when the steel ball (4) and the sealing sleeve (5) are pressed into the vent hole (100), the plurality of annular protrusions (502) are squeezed and deformed and fit tightly against the inner wall of the vent hole (100).

7. The relay according to claim 6, characterized in that: The cross-sections of the plurality of annular protrusions (502) along the axial direction of the sealing sleeve (5) are sawtooth-shaped, and the projections of the plurality of annular protrusions (502) along the radial direction of the sealing sleeve (5) can fall on the inner wall of the blind hole (501), so that when the steel ball (4) is pressed into the blind hole (501), it can cooperate with the inner wall of the vent hole (100) to squeeze the annular protrusions (502) to produce deformation.

8. The relay according to claim 6, characterized in that: The sealing sleeve (5) and the vent hole (100) are connected to each other through secondary sealing by welding or glue dispensing technology.

9. The relay according to claim 3, wherein: The port of the blind hole (501) is provided with a first chamfer (503) along the edge; and the end of the vent hole (100) away from the sealed space is provided with a second chamfer (101) along the edge.

10. The relay according to claim 1, wherein: The vent hole (100) is provided on the magnetic pole piece (2), and the magnetic pole piece (2) is provided with an annular boss (201) that extends the depth of the vent hole (100).

Images