Relay

Abstract

The invention discloses a relay which comprises an arc extinguishing cover, a magnetic pole piece and a sleeve, the arc extinguishing cover and the sleeve are fixedly arranged on the two sides of the magnetic pole piece respectively, and a sealed space for a movable contact assembly of the relay to move is formed among 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 communicated with the sealed space, a sealing assembly is installed in the vent hole and comprises a steel ball and a sealing sleeve, the steel ball is embedded in the sealing sleeve in an interference mode, and the sealing sleeve is embedded in the vent hole in an interference mode. And the sealing sleeve deforms under the 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 steel ball and the sealing sleeve are matched for use to seal the vent hole, the sealing reliability can be improved, only one sealing point position needs to be considered, the air tightness of a sealed space is effectively guaranteed, the electrical life of a product is guaranteed, the process is simple, the production efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical control devices, and particularly to a relay. Background Art

[0002] Currently, in order to prevent the generation of arc combustion when the moving and static contacts are separated, the mainstream method for existing relays is to fill the relay with a protective gas such as hydrogen H2. This requires the interior of the relay to be a sealed space 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 a protective gas, as Figure 1 shown, the existing design is as follows: A vent hole is provided on the lower surface of the magnetic pole piece and connected to an exhaust pipe 12. A solder ring 13 is provided between the vent hole of the magnetic pole piece and the exhaust pipe 12. When heated at a high temperature, the solder ring 13 melts to fill the gap at the connection between the two, making their connection sealed. The protective gas is filled into the sealed space through the exhaust pipe 12. After the filling is completed, the exhaust pipe 12 is clamped to ensure the airtightness of the sealed space. This existing design has the following defects: 1. It is necessary to ensure not only the airtightness of the connection between the exhaust pipe 12 and the magnetic pole piece, but also the airtightness of the clamped part of the exhaust pipe 12. The airtightness is unstable and prone to seal failure problems, affecting the electrical life of the product. 2. The process is complex and the cost is high. A ring-shaped solder ring 13 is required, with complex forming. Moreover, the material of the solder ring 13 is usually silver copper 28, which has a high cost. 3. It is difficult to control the thickness of the solder ring 13. Less solder is likely to cause false soldering, affecting the sealing reliability. More solder is likely to cause solder creep, resulting in waste and affecting the final airtightness.

[0004] With the continuous increase in the voltage levels of electric vehicles and charging systems, higher requirements are put forward for the stability and safety of relays. The airtightness inside the relay is an important indicator for inspecting the quality of the relay. If seal failure problems occur, it will seriously affect the electrical life of the product and even cause huge safety accidents. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a relay to overcome the defects of the existing relay's sealing structure, such as many sealing points to be concerned about, complex sealing process, unstable airtightness, and high cost.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A relay includes an arc extinguishing cover, a magnetic pole piece, and a sleeve. The arc extinguishing cover and the sleeve are respectively fixed on both sides of the magnetic pole piece, and a sealed space for the 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 communicating with the sealed space, and a sealing assembly is installed in the vent hole. The sealing assembly includes a steel ball and a sealing sleeve. The steel ball is press-fitted in the sealing sleeve with interference, the sealing sleeve is press-fitted in the vent hole with interference, and the sealing sleeve deforms under the extrusion of the steel ball and the inner wall of the vent hole to closely fit the inner wall of the vent hole.

[0007] 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.

[0008] 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 sealed space, the diameter of the steel ball is greater than the inner diameter of the blind hole, and the steel ball is press-fitted in the blind hole with interference in a physical pressing-in manner along the port of the blind hole.

[0009] 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,

[0010] A part of the steel ball is fixedly pressed at the port of the sealing sleeve so that the steel ball and the sealing sleeve are a combined part fixedly connected together;

[0011] Or the steel ball and the sealing sleeve are two separate parts.

[0012] As a further improvement of the present invention, both the vent hole and the sealing sleeve are circular, and the outer diameter of the sealing sleeve is greater than the inner diameter of the vent hole, and the sealing sleeve is press-fitted in the vent hole with interference in a physical pressing-in manner.

[0013] As a further improvement of the present invention, a plurality of annular convex teeth 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 convex teeth are extruded to deform and closely fit the inner wall of the vent hole.

[0014] As a further improvement of the present invention, the cross-section of the plurality of annular convex teeth along the axial direction of the sealing sleeve is serrated, and the projection of the plurality of annular convex teeth 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 extrude the annular convex teeth to deform.

[0015] As a further improvement of the present invention, the sealing sleeve and the ventilation hole are secondarily sealed and connected through a welding or dotting process.

[0016] As a further improvement of the present invention, a first chamfer is provided along the edge of the port of the blind hole; a second chamfer is provided along the edge of the end of the ventilation hole away from the sealed space.

[0017] As a further improvement of the present invention, the ventilation hole is provided on the magnetic pole piece, and the magnetic pole piece is provided with an annular boss that extends the depth of the ventilation hole.

[0018] The beneficial effects of the present invention are as follows: The present invention provides a relay. The sealed space of the relay is formed by the corresponding sealed connection of the arc extinguishing cover, the magnetic pole piece and the sleeve. By providing a ventilation hole on any one of the arc extinguishing cover, the magnetic pole piece and the sleeve, and press-fitting a steel ball and a sealing sleeve in the ventilation hole to achieve sealing, the reliability of the sealing can be improved, and there is only one point that needs to consider sealing, effectively ensuring the airtightness of the sealed space, guaranteeing the electrical life of the product. At the same time, this design simplifies the sealing process, is more suitable for automated production, improves production efficiency, and reduces processing costs and material costs. Description of the Drawings

[0019] Figure 1 Is a perspective view of the existing magnetic pole piece sealing structure;

[0020] Figure 2 Is a perspective view of the first embodiment of the relay of the present invention;

[0021] Figure 3 Is a cross-sectional view of the first embodiment of the relay of the present invention;

[0022] Figure 4 For the present invention Figure 3 Enlarged view of A in;

[0023] Figure 5 Is a perspective view of the magnetic pole piece of the first embodiment of the relay of the present invention;

[0024] Figure 6 Is a three-dimensional Figure 1 ;

[0025] Figure 7 Is a three-dimensional Figure 2 ;

[0026] Figure 8 Is a perspective view of the combination of the steel ball and the sealing sleeve of the relay of the present invention fixed together;

[0027] Figure 9 Is a cross-sectional view of the second embodiment of the relay of the present invention;

[0028] Figure 10 Stereogram of the decomposed sealing component in the third embodiment of the relay of the present invention;

[0029] Figure 11 Cross-sectional view of the assembly of the sealing component and the magnetic pole piece in the third embodiment of the relay of the present invention;

[0030] Figure 12 Cross-sectional view of the assembly of the sealing component and the magnetic pole piece in the fourth embodiment of the relay of the present invention;

[0031] Figure 13 Stereogram of the fifth embodiment of the relay of the present invention;

[0032] Figure 14 Cross-sectional view of the fifth embodiment of the relay of the present invention;

[0033] Figure 15 For the present invention Figure 14 Enlarged view of B in;

[0034] Figure 16 Stereogram of the arc extinguishing cover in the fifth embodiment of the relay of the present invention;

[0035] Figure 17 Stereogram of the sixth embodiment of the relay of the present invention.

[0036] The following description is made in conjunction with the accompanying drawings:

[0037] 1. Arc extinguishing cover; 100. Vent hole; 101. Second chamfer; 102. Stop step; 2. Magnetic pole piece; 201. Annular boss; 3. Sleeve; 4. Steel ball; 5. Sealing sleeve; 501. Blind hole; 502. Annular convex tooth; 503. First chamfer; 6. Connecting ring; 7. Static contact; 8. Moving contact piece; 9. Push rod assembly; 10. Moving iron core; 11. Static iron core; 12. Exhaust pipe; 13. Solder ring. Specific embodiments

[0038] The following is a detailed description of a preferred embodiment of the present invention in conjunction with the accompanying drawings.

[0039] Embodiment 1

[0040] Referring to Figures 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.

[0041] Among them, the arc extinguishing cover 1 can be made of ceramic material, the bottom of which is hermetically welded to the top of the magnetic pole piece 2 through a connecting ring 6, and two static contacts 7 are hermetically fixed side by side at the top of the arc extinguishing cover 1, and the lower ends of the two static contacts 7 both extend downward into the cavity of the arc extinguishing cover 1.

[0042] Further, 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 installed at the upper end of the push rod assembly 9 and is located in the cavity of the arc extinguishing cover 1, and the moving contact piece 8 is arranged opposite to the two static contact heads 7. A through hole is provided in the middle of the magnetic pole piece 2, and the push rod of the push rod assembly 9 passes vertically through the through hole of the magnetic 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 magnetic pole piece 2. The static iron core 11 is sleeved outside the push rod of the push rod assembly 9 and is directly above the moving iron core 10.

[0043] Furthermore, the sleeve 3 is in the shape of a bottomed and open-topped cup, and a flanging is provided along the outer periphery of the upper end of the sleeve 3. The sleeve 3 is sleeved on the moving iron core 10 and the static iron core 11 and is hermetically welded to the bottom of the magnetic pole piece 2 through the flanging, so as to form a sealed space between the arc extinguishing cover 1, the magnetic pole piece 2, and the sleeve 3 for the moving contact assembly of the relay to move. This sealed space is used to fill with a protective gas.

[0044] Refer to Figures 2 to 5 , the magnetic pole piece 2 is provided with a vent hole 100 communicating with the sealed space. The vent hole 100 is arranged along the thickness direction of the magnetic pole piece 2 (i.e., the vertical direction with Figure 3 as a reference), and the upper and lower ends of the vent hole 100 penetrate through the top surface and the bottom surface of the magnetic pole piece 2.

[0045] As one of the important improvements of the present application, a sealing assembly is installed in the vent hole 100 of the magnetic pole piece 2. The sealing assembly includes a steel ball 4 and a sealing sleeve 5. The steel ball 4 is press-fitted into the sealing sleeve 5, and the sealing sleeve 5 is press-fitted into the vent hole 100. Moreover, the sealing sleeve 5 deforms under the extrusion of the steel ball 4 and the inner wall of the vent hole 100 to closely fit the inner wall of the vent hole 100, thereby realizing the sealing of the vent hole 100. The present invention abandons the traditional sealing method using an exhaust pipe clamp, and adopts a brand-new idea, that is, the vent hole 100 is sealed by the cooperation of the steel ball 4 and the sealing sleeve 5, which can improve the reliability of the sealing. Moreover, only one point for sealing needs to be considered, effectively ensuring the airtightness of the sealed space, guaranteeing the electrical life of the product. At the same time, this design also simplifies the sealing process and reduces the processing cost and material cost.

[0046] As Figure 5 and Figure 6 shown, both the vent hole 100 and the sealing sleeve 5 in the present application are circular. The circular design is more conducive to realizing the sealing. More specifically, the sealing sleeve 5 is in the shape of a cylinder with one end closed and the other end open, and thus a blind hole 501 is formed inside the sealing sleeve 5. The port of the blind hole 501 faces the direction away from the sealed space (with Figure 3 as a reference, that is, vertically downward).

[0047] Among them, the diameter of the steel ball 4 is greater than the inner diameter of the blind hole 501, and the steel ball 4 is press-fitted into the blind hole 501 in an interference fit manner along the port of the blind hole 501 by physical pressing. The outer diameter of the sealing sleeve 5 is greater than the inner diameter of the vent hole 100, and the sealing sleeve 5 is press-fitted into the vent hole 100 in an interference fit manner by physical pressing.

[0048] In addition, as Figure 4 and Figure 5 shown, a stop step 102 is provided along the inner wall at one end of the vent hole 100 close to the sealed space. The stop step 102 can be but is not limited to being annular, and one end of the sealing sleeve 5 abuts against the stop step 102.

[0049] 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. When the protective gas is filled into the sealed space through the vent hole 100, the sealing sleeve 5 is placed at one end of the vent hole 100 far from the sealed space, and at the same time, the steel ball 4 is placed at the port of the blind hole 501 of the sealing sleeve 5. The steel ball 4 and the sealing sleeve 5 are pressed into the vent hole 100 of the pole piece 2 together through an external press until the steel ball 4 is pressed into the blind hole 501 and the sealing sleeve 5 abuts against the stop step 102; during the pressing process, the steel ball 4 cooperates with the inner wall of the vent hole 100 to continuously squeeze the sealing sleeve 5, causing the sealing sleeve 5 to deform to closely fit the inner wall of the vent hole 100, thereby realizing the sealing of the vent hole 100. By adopting this structural design in the present application, the steel ball 4 and the sealing sleeve 5 are pressed into the vent hole 100 at one step to achieve sealing. The process is simple, more suitable for automated production, improves production efficiency, and the stop step 102 is used to stop the sealing sleeve 5, which can ensure that the sealing sleeve 5 and the steel ball 4 are pressed in place.

[0050] As Figure 8 shown, 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 (such as half) of the steel ball 4 can be fixed and crimped in advance at the port of the blind hole 501 of the sealing sleeve 5 so that the steel ball 4 and the sealing sleeve 5 are a combined part fixed together. This method is more convenient for subsequent pressing of the combined part into the vent hole 100 and is easy to produce.

[0051] In addition, the present invention can also perform secondary sealing connection between the sealing sleeve 5 and the vent hole 100 through welding (such as laser welding) or glue-dotting process to further improve the sealing performance.

[0052] It is worth mentioning that, as Figure 4 and Figure 7As shown in the figure, a number of annular convex teeth 502 are arranged axially on the outer circumferential surface of the sealing sleeve 5. The cross-section of the number of annular convex teeth 502 along the axis of the sealing sleeve 5 is serrated, and the projection of the number of annular convex teeth 502 along the radial direction of the sealing sleeve 5 can fall on the inner wall of the blind hole 501. During the process of pressing the steel ball 4 and the sealing sleeve 5 into the vent hole 100 together, as the steel ball 4 continuously advances towards the blind hole 501 of the sealing sleeve 5, it forces the inner diameter of the blind hole 501 to expand outwards, and continuously squeezes the number of annular convex teeth 502 to deform in cooperation with the inner wall of the vent hole 100, so that the number of annular convex teeth 502 is tightly engaged with the inner wall of the vent hole 100. Among them, each annular convex tooth 502 can achieve a seal with the inner wall of the vent hole 100, and multiple seals can be formed by the number of annular convex teeth 502, further improving the reliability of the seal.

[0053] Refer to Figure 8 , a first chamfer 503 is provided along the edge of the port of the blind hole 501. The first chamfer 503 is used to play a role in assembling, guiding and positioning the steel ball 4.

[0054] Similarly, as Figure 5 shown, 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 play a role in assembling, guiding and positioning the sealing sleeve 5, so as to facilitate the alignment and pressing in.

[0055] Optionally, the thickness of the magnetic pole piece 2 is 3 mm to 4 mm to ensure that the magnetic pole piece 2 has sufficient strength to support the subsequent pressing in of the steel ball 4 and the sealing sleeve 5. The overall thickness of the magnetic pole piece 2 is greater than or equal to the thickness of the sealing sleeve 5, that is to say, the depth of the vent hole 100 on the magnetic 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 magnetic pole piece 2.

[0056] 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.

[0057] 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. In this embodiment, preferably, the thickness of the magnetic 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.

[0058] Optionally, the material of the steel ball 4 is high-carbon chromium bearing steel, and the magnetic pole piece 2 is made of an alloy material of model 4J33.

[0059] Refer toFigure 3 , the relay of the present application further includes a coil winding (not shown in the figure). It should be noted that both the coil winding and the moving contact assembly in the present application adopt existing conventional technologies. The coil winding is sleeved outside the sleeve 3. When the coil winding is energized, the static iron core 11 and the moving iron core 10 can be magnetized. The moving iron core 10 is attracted by the static iron core 11 and moves upward, and pushes the moving contact piece 8 upward through the push rod assembly 9, so that the moving contact piece 8 contacts and conducts with the two static contacts 7; when the coil winding is de-energized, the magnetic attraction between the moving iron core 10 and the static iron core 11 disappears. Under the action of the return spring between the moving iron core 10 and the static iron core 11, the moving iron core 10 moves downward, and drives the moving contact piece 8 to break off from the two static contacts 7 through the push rod assembly 9.

[0060] Embodiment 2

[0061] Refer to Figure 9 , the difference between this embodiment and Embodiment 1 is that: there is no design of the stop step 102 in the vent hole 100. By controlling the advancing distance of the external press, the depth of the steel ball 4 and the sealing sleeve 5 pressed into the vent hole 100 together is controlled to ensure that the steel ball 4 and the sealing sleeve 5 are pressed in place to achieve sealing.

[0062] Embodiment 3

[0063] Refer to Figure 10 and Figure 11 , the difference between this embodiment and Embodiment 1 is that: the thickness of the magnetic pole piece 2 in this embodiment is reduced compared with the thickness of the magnetic pole piece 2 in Embodiment 1 to further save material costs. At the same time, in order to ensure the local strength around the vent hole 100 of the magnetic pole piece 2, a ring-shaped boss 201 is provided at the bottom of the magnetic pole piece 2 at the vent hole 100 in this embodiment. The ring-shaped boss 201 extends the depth of the vent hole 100 and enhances the local strength around the vent hole 100 of the magnetic pole piece 2 to support the subsequent pressing-in of the steel ball 4 and the sealing sleeve 5. [[ID=2"]]

[0064] In this embodiment, optionally, the thickness of the magnetic pole piece 2 except for the ring-shaped boss 201 is 2 mm to 3 mm, preferably 2 mm; the thickness of the ring-shaped boss 201 is 2 mm to 3 mm, preferably 1.5 mm, and the thickness of the stop step in the vent hole 100 is 1.5 mm.

[0065] Embodiment 4

[0066] Refer to Figure 12 , the difference between this embodiment and Embodiment 3 is that: there is no design of the stop step 102 in the vent hole 100. By controlling the advancing distance of the external press, the depth of the steel ball 4 and the sealing sleeve 5 pressed into the vent hole 100 together is controlled to ensure that the steel ball 4 and the sealing sleeve 5 are pressed in place to achieve sealing.

[0067] Embodiment 5

[0068] Refer to Figures 13 to 16 The difference between this embodiment and the first embodiment is as follows: The vent hole 100 is provided on the arc extinguishing cover 1, while there is no vent hole 100 designed on the magnetic pole piece 2 in this embodiment, and the thickness of the magnetic pole piece 2 in this embodiment can be reduced compared to the magnetic pole piece 2 in the first embodiment. Other components of the relay except for the above are the same as those in the first embodiment.

[0069] In this embodiment, the vent hole 100 can be, but is not limited to, provided at the top of the arc extinguishing cover 1 along the vertical direction. The arc extinguishing cover 1 can be made of ceramic material, and a second chamfer 101 is provided along the upper edge of the upper end of the vent hole 100, which serves to guide the assembly of the sealing sleeve 5 for easy press-fitting in place. Similarly, a stop step 102 is provided along the inner wall at the lower end of the vent hole 100.

[0070] Furthermore, the wall thickness of the arc extinguishing cover 1 is 3 mm to 4 mm, preferably 3.5 mm, to ensure that the arc extinguishing cover 1 has sufficient strength to support the subsequent press-fitting of the steel ball 4 and the sealing sleeve 5. The wall thickness of the arc extinguishing cover 1 is greater than or equal to the thickness of the sealing sleeve 5, that is, the depth of the vent hole 100 on the arc extinguishing cover 1 is also greater than or equal to the thickness of the sealing sleeve 5, so that the sealing sleeve ⑤ can be completely press-fitted into the vent hole 100 of the arc extinguishing cover 1.

[0071] When the protective gas is filled into the sealed space through the vent hole 100 of the arc extinguishing cover 1, the sealing sleeve 5 is placed at the upper end of the vent hole 100 of the arc extinguishing cover 1, and the port of the blind hole 501 of the sealing sleeve 5 is arranged upward. At the same time, the steel ball 4 is placed at the port of the blind hole 501 of the sealing sleeve 5. The steel ball 4 and the sealing sleeve 5 are pressed into the vent hole 100 of the arc extinguishing cover 1 together through an external press until the steel ball 4 is pressed into the blind hole 501 and the sealing sleeve 5 abuts against the stop step 102; during the press-fitting process, the steel ball 4 cooperates with the inner wall of the vent hole 100 of the arc extinguishing cover 1 to continuously squeeze the sealing sleeve 5, causing the sealing sleeve 5 to deform to closely fit the inner wall of the vent hole 100, thereby realizing the sealing of the vent hole 100.

[0072] Embodiment Six

[0073] Refer to Figure 17 The difference between this embodiment and the fifth embodiment is as follows: There is no design of the stop step 102 in the vent hole 100. By controlling the advancing distance of the external press, the depth of the steel ball 4 and the sealing sleeve 5 pressed into the vent hole 100 together is controlled to ensure that the steel ball 4 and the sealing sleeve 5 are pressed in place to achieve sealing.

[0074] Embodiment Seven

[0075] The difference between this embodiment and the first embodiment is as follows: The vent hole 100 is provided on the sleeve 3, while there is no vent hole 100 designed on the pole piece 2 in this embodiment, and the thickness of the pole piece 2 in this embodiment can be reduced compared to the pole piece 2 in the first embodiment. Other components of the relay except for the above are the same as those in the first embodiment.

[0076] In addition, in order to ensure that the sleeve 3 has sufficient strength to support the subsequent pressing-in of the steel ball 4 and the sealing sleeve 5, the overall thickness of the sleeve 3 can be increased, or the bottom thickness 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 on the bottom of the sleeve 3 in the vertical direction, and a stop step 102 is also provided in the vent hole 100.

[0077] When 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 together by an external press until the steel ball 4 is pressed into the blind hole 501 and the sealing sleeve 5 abuts against the stop step 102; during the pressing-in 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 to closely fit the inner wall of the vent hole 100, thereby achieving the sealing of the vent hole 100. [[ID=]7]

[0078] Optionally, the sleeve 3 is made of stainless steel.

[0079] In summary, the present invention provides a relay. The sealed space of the relay is formed by the corresponding sealed connection of the arc extinguishing cover 1, the pole piece 2 and the sleeve 3. By providing a vent hole 100 on any one of the arc extinguishing cover 1, the pole piece 2 and the sleeve, and press-fitting a steel ball 4 and a sealing sleeve 5 in the vent hole 100 to achieve sealing, the sealing reliability can be improved, and only one point where sealing needs to be considered is required, effectively ensuring the airtightness of the sealed space, guaranteeing the electrical life of the product. At the same time, this design simplifies the sealing process, is more suitable for automated production, improves production efficiency, and reduces processing costs and material costs.

[0080] Numerous specific details have been set forth in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments 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 by 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 equivalent embodiments with equivalent changes. All simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A relay, comprising an arc extinguishing cover (1), a magnetic pole piece (2) and a sleeve (3), wherein the arc extinguishing cover (1) and the sleeve (3) are respectively fixedly arranged on two sides of the magnetic pole piece (2), and a sealed space for the movable contact assembly of the relay to move is formed between the arc extinguishing cover (1), the magnetic pole piece (2) and the sleeve (3), characterized in that: Any one of the arc extinguishing cover (1), the magnetic pole piece (2), and the sleeve (3) is provided with a vent hole (100) communicating with the sealed space, and a sealing assembly is installed in the vent hole (100). The sealing assembly includes a steel ball (4) and a sealing sleeve (5). The steel ball (4) is press-fitted into the sealing sleeve (5), and the sealing sleeve (5) is press-fitted into the vent hole (100). The sealing sleeve (5) deforms under the extrusion of the steel ball (4) and the inner wall of the vent hole (100) to closely fit the inner wall of the vent hole (100).

2. The relay according to claim 1, characterized in that: 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). The port of the blind hole (501) is arranged facing away from the sealed space. The diameter of the steel ball (4) is larger than the inner diameter of the blind hole (501). The steel ball (4) is press-fitted into the blind hole (501) in a physically pressed-in manner along the port of the blind hole (501).

4. The relay according to claim 3, characterized in that: In the initial state, that is, when the sealing sleeve (5) is not pressed into the vent hole (100), A part of the steel ball (4) is fixedly pressed at the port of the sealing sleeve (5) so that the steel ball (4) and the sealing sleeve (5) are a combined part fixed together; Or the steel ball (4) and the sealing sleeve (5) are two separate parts.

5. The relay according to claim 3, characterized in that: Both the vent hole (100) and the sealing sleeve (5) are 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 press-fitted into the vent hole (100) in a physically pressed-in manner.

6. The relay according to claim 5, wherein: A plurality of annular convex teeth (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 convex teeth (502) are extruded and deformed to closely fit the inner wall of the vent hole (100).

7. The relay according to claim 6, characterized in that: The cross-section of the plurality of annular convex teeth (502) along the axial direction of the sealing sleeve (5) is serrated, and the projection of the plurality of annular convex teeth (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 extrude the annular convex teeth (502) to deform.

8. The relay according to claim 6, wherein: The sealing sleeve (5) and the vent hole (100) are secondarily sealed and connected by welding or dispensing process.

9. The relay according to claim 3, characterized in that: A first chamfer (503) is provided along the edge of the port of the blind hole (501); a second chamfer (101) is provided along the edge of the end of the vent hole ().

10. The relay according to claim 1, characterized in that: 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) extending the depth of the vent hole (100).

Images