Relay

Abstract

The utility model discloses a relay, comprising a ceramic cover and a magnetic pole piece, the ceramic cover is in sealing connection with the magnetic pole piece through a connecting ring, and a sealing cavity used for accommodating a moving contact piece and a static contact of the relay is formed between the ceramic cover and the magnetic pole piece; the magnetic pole piece is provided with a vent hole leading to the sealing cavity, and a sealing piece used for sealing the vent hole is installed in the vent hole. And a first chamfer is arranged at one end, far away from the sealing cavity, of the vent hole, of the magnetic pole piece. According to the relay, the sealing mode is optimized, the sealing reliability is improved, only one sealing point position needs to be considered, the air tightness is better and more stable, the electrical life of a product is ensured, meanwhile, the sealing process complexity is reduced by adopting the design that the vent hole is sealed by the sealing element, the relay is more suitable for automatic production, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of switch electrical appliances, in particular to a relay. Background Art

[0002] During the operation of high-voltage DC relays, due to the generation and combustion of arcs, certain oxidation and carbides will be generated at the contact points, which will cause poor contact at the contact points, thus affecting the performance and life of the relay. In order to ensure the normal operation of high-voltage DC relays, the conventional method is to fill the cavity of the relay with protective gas, which can prevent oxygen from entering the relay cavity again and prevent arc burning.

[0003] like Figure 1 As shown, the prior art method of filling the cavity of the relay with protective gas is as follows: a vent hole is provided on the lower surface of the pole piece to connect with the exhaust pipe 20, and a solder ring 30 is provided between the vent hole of the pole piece and the exhaust pipe 20. When heated at high temperature, the solder ring 30 melts and fills the gap at the connection between the two, making it sealed. The protective gas is inflated into the cavity through the exhaust pipe 20. When the inflation is completed, the exhaust pipe 20 is clamped to ensure the sealing of the cavity. This sealing structure of the prior art is not only complex in process, but also requires attention to many sealing points. It is necessary to ensure not only the sealing of the connection between the exhaust pipe 20 and the pole piece, but also the sealing of the jaws of the exhaust pipe 20. The airtightness is unstable, and sealing failure is prone to occur, which affects the electrical life of the product. Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. Summary of the invention

[0004] The problem to be solved by the utility model is to provide a relay to overcome the defects of the existing relays, such as complex sealing structure process, many sealing points requiring attention, unstable air tightness, and easy sealing failure, thus affecting the electrical life of the product.

[0005] The utility model adopts the following technical solution to solve the technical problem: a relay, comprising: a ceramic cover and a magnetic pole piece, wherein the ceramic cover is sealed and connected to the magnetic pole piece through a connecting ring and a sealed cavity for accommodating a moving contact piece and a static contact of the relay is formed therebetween; the magnetic pole piece is provided with an air vent leading to the sealed cavity, and a sealing member for sealing the air vent is installed in the air vent; wherein a first chamfer is provided at one end of the magnetic pole piece located at the air vent away from the sealed cavity.

[0006] As a further improvement of the present invention, the sealing member is a ball, the diameter of the ball is larger than the inner diameter of the vent hole, and the ball is inserted into the vent hole along the first chamfer by interference fit.

[0007] As a further improvement of the present invention, the ball is not completely pressed into the vent hole, and the ball is in sealing contact with the first chamfer.

[0008] As a further improvement of the utility model, a plane parallel to the magnetic pole piece and passing through the center of the ball is used as a dividing interface, and the dividing interface divides the ball into an upper hemisphere and a lower hemisphere. The hemispherical surface of the upper hemisphere is arranged facing the sealing cavity, and the part where the ball contacts the first chamfer is located on the upper hemisphere.

[0009] As a further improvement of the utility model, the ball is connected to the inner wall of the vent hole for secondary sealing by welding.

[0010] As a further improvement of the utility model, the magnetic pole piece located in the vent hole is further provided with a second chamfer connected to the upper end of the first chamfer.

[0011] As a further improvement of the present invention, the second chamfer is smaller than the first chamfer.

[0012] As a further improvement of the utility model, a plane parallel to the magnetic pole piece and passing through the center of the ball is used as a dividing interface, and the dividing interface divides the ball into an upper hemisphere and a lower hemisphere. The hemispherical surface of the upper hemisphere is arranged facing the sealing cavity, and the upper hemisphere is in contact with the second chamfer seal.

[0013] As a further improvement of the present invention, the size of the first chamfer is 0.5 mm to 1 mm, and the size of the second chamfer is 0.2 mm to 0.5 mm.

[0014] As a further improvement of the utility model, the diameter of the ball is 2 mm to 3 mm, and the inner diameter of the vent hole is 1 mm to 2.5 mm.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a relay, which realizes sealing by opening an air vent leading to a sealed cavity on a magnetic pole piece and installing a seal in the air vent, the structure optimizes the sealing method, improves the reliability of the seal, and only one sealing point needs to be considered, the air tightness is better and more stable, and the electrical life of the product is guaranteed, while the design of the ball-sealed air vent also reduces the complexity of the sealing process, is more suitable for automated production, reduces production costs, and improves production efficiency; at the same time, by providing a first chamfer and a second chamfer in the air vent, it can not only play a role in ball guiding and positioning, but also play a role in increasing the sealing contact area, further improving the sealing effect and the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the existing magnetic pole piece sealing structure;

[0017] Figure 2 It is a three-dimensional diagram of a relay according to a first embodiment of the utility model;

[0018] Figure 3 This is a three-dimensional diagram of a relay according to the first embodiment of the utility model with the ball disassembled;

[0019] Figure 4 It is a cross-sectional view of a relay according to Embodiment 1 of the present utility model;

[0020] Figure 5 For this utility model Figure 4 A magnified view of middle;

[0021] Figure 6 This is a three-dimensional diagram of the assembly of the magnetic pole piece and the ball according to the first embodiment of the utility model;

[0022] Figure 7 A three-dimensional diagram of a magnetic pole piece according to the second embodiment of the present utility model;

[0023] Figure 8 It is a cross-sectional view of a magnetic pole piece of Embodiment 2 of the present utility model;

[0024] Fig. 9 This is a cross-sectional view of the assembly of the pole piece and the ball according to the second embodiment of the present invention.

[0025] Combined with the accompanying drawings, the following description is given:

[0026] 1. Ceramic cover; 2. Pole piece; 201. Ventilation hole; 202. First chamfer;

[0027] 203, second chamfer; 3, moving contact piece; 4, static contact; 5, sealing cavity; 6, ball; 601, upper hemisphere; 602, lower hemisphere; 7, interface; 8, sleeve; 9, connecting ring; 10, push rod assembly; 11, static iron core; 12, moving iron core; 20, exhaust pipe; 30, solder ring. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] Embodiment 1

[0030] See also Figures 2 to 6 The utility model provides a relay, including a ceramic cover 1 and a magnetic pole piece 2. The ceramic cover 1 can be sealed and welded to the top of the magnetic pole piece 2 through a connecting ring 9, and a sealed cavity 5 is formed between the ceramic cover 1 and the magnetic pole piece 2. The sealed cavity 5 is used to accommodate a moving contact piece 3 and a stationary contact 4 of the relay. The moving contact piece 3 and the stationary contact 4 of the relay can perform opening and closing actions in the sealed cavity 5.

[0031] like Figures 3 to 5 As shown, the pole piece 2 is provided with a vent hole 201 leading to the sealed cavity 5. The vent hole 201 is along the thickness direction of the pole piece 2 (i.e., Figure 4 The vent hole 201 is arranged in the vertical direction of reference, and the upper and lower ends of the vent hole 201 pass through the top and bottom surfaces of the magnetic pole piece 2.

[0032] Furthermore, a sealing member is installed in the vent hole 201 to seal it. In the present embodiment, the sealing member is but not limited to a ball 6 .

[0033] Among them, the diameter of the ball 6 is larger than the inner diameter of the vent 201, and the pole piece 2 is provided with a first chamfer 202 at one end of the vent 201 away from the sealing cavity 5. The ball 6 is inserted into the vent 201 along the first chamfer 202 from bottom to top by an external press, thereby achieving a one-time seal.

[0034] Optionally, the size of the first chamfer 202 is 0.5 mm to 1 mm; the utility model can serve as an assembly guide for the ball 6 by setting the first chamfer 202 .

[0035] In addition, in order to ensure the reliability of the ball 6 sealing the vent hole 201, the ball 6 is also welded to the inner wall of the vent hole 201 for secondary sealing connection, wherein the welding method can be but is not limited to soldering, laser welding, resistance welding, etc.

[0036] In this way, the utility model realizes sealing by opening a vent hole 201 leading to the sealing cavity 5 on the pole piece 2 and installing a ball 6 in the vent hole 201. This structure optimizes the sealing method and improves the reliability of the seal. There is only one sealing point to be considered, and the air tightness is better and more stable, thereby ensuring the electrical life of the product. At the same time, the design of using the ball 6 to seal the vent hole 201 also reduces the complexity of the sealing process, is more suitable for automated production, reduces production costs, and improves production efficiency.

[0037] It is worth mentioning that Figure 5 As shown, the ball 6 is not completely pressed into the vent hole 201, which means that the ball 6 is partially in the vent hole 201, and the rest of the ball 6 is outside the vent hole 201; the ball 6 is in sealed contact with the upper end of the first chamfer 202 and the part where the vent hole 201 is connected to the first chamfer 202. The plane parallel to the magnetic pole piece 2 and passing through the center of the ball 6 is used as the dividing interface 7, and the dividing interface 7 divides the ball 6 into an upper hemisphere 601 and a lower hemisphere 602, wherein the hemispherical surface of the upper hemisphere 601 is arranged facing the sealing cavity 5, and the part where the ball 6 contacts the first chamfer 202 is on the upper hemisphere 601. This technical solution can make the diameter of the ball 6 larger than the inner diameter of the vent hole 201, thereby improving the sealing effect.

[0038] Optionally, the diameter of the ball 6 is 2 mm to 3 mm, and the inner diameter of the vent hole 201 is 1 mm to 2.5 mm.

[0039] In the present embodiment, preferably, the diameter of the ball 6 is 2 mm, the inner diameter of the vent hole 201 is 1.5 mm, the size of the first chamfer 202 is C0.5 mm, and the thickness of the pole piece 2 is 2 mm.

[0040] Optionally, the ball 6 is made of high-carbon chromium bearing steel, and the pole piece 2 is made of an alloy material of model 4J33.

[0041] The sealing process of the utility model relay is as follows:

[0042] After the protective gas is filled into the sealing cavity 5 through the vent hole 201, the ball 6 is press-fitted from bottom to top onto the vent hole 201 of the pole piece 2 by an external press, and finally the ball 6 is welded to the pole piece 2 to complete the sealing.

[0043] See also Figure 4 The utility model relay also includes a sleeve 8, a push rod assembly 10, a static iron core 11, a moving iron core 12 and an electromagnetic system (not shown in the figure), all of which adopt existing conventional technologies. Two static contacts 4 are sealed and welded side by side on the top of the ceramic cover 1, and the moving contact piece 3 is in the sealed cavity 5 and installed on the push rod assembly 10. The lower end of the push rod of the push rod assembly 10 passes through the magnetic pole piece 2 and is fixedly connected to the moving iron core 12. The static iron core 11 is fixed to the bottom of the magnetic pole piece 2 and is distributed above the moving iron core 12 at intervals; the sleeve 8 is sleeved on the static iron core 11 and the moving iron core 12 and is sealed and fixed to the bottom of the magnetic pole piece 2, so that the sleeve 8, the magnetic pole piece 2, the connecting ring 9 and the ceramic cover 1 form a closed space. The electromagnetic system is sleeved on the sleeve 8. When the electromagnetic system is working, the static iron core 11 and the moving iron core 12 are magnetized. The moving iron core 12 is attracted by the static iron core 11 and moves upward and is finally attracted to the bottom of the static iron core 11. During this process, the moving iron core 12 pushes the moving contact piece 3 upward through the push rod assembly 10, so that the moving contact piece 3 is in contact with the two static contacts 4 and is connected; when the electromagnetic system is not working, the magnetic attraction between the moving iron core 12 and the static iron core 11 disappears. Under the action of the reset spring between the moving iron core 12 and the static iron core 11, the moving iron core 12 moves downward and is disconnected from the two static contacts 4 with the moving contact piece 3 through the push rod assembly 10.

[0044] Embodiment 2

[0045] The difference between this embodiment and the first embodiment is that the structure of the vent hole 201 of the pole piece 2 is different.

[0046] For details, see Figures 7 to 9The magnetic pole piece 2 is located in the vent hole 201 and is further provided with a second chamfer 203 . The second chamfer 203 is located at the top of the first chamfer 202 , and the lower end of the second chamfer 203 is connected to the upper end of the first chamfer 202 .

[0047] Furthermore, the second chamfer 203 is smaller than the first chamfer 202 .

[0048] Optionally, the size of the second chamfer 203 is 0.2 mm to 0.5 mm.

[0049] In this embodiment, Fig. 9 As shown, the ball 6 is also not completely pressed into the vent hole 201, and the ball 6 is in sealing contact with the second chamfer 203. The plane parallel to the pole piece 2 and passing through the center of the ball 6 is used as the interface 7, and the interface 7 divides the ball 6 into an upper hemisphere 601 and a lower hemisphere 602, wherein the hemispherical surface of the upper hemisphere 601 is arranged facing the sealing cavity 5, and the part where the ball 6 contacts the second chamfer 203 is on the upper hemisphere 601. In this embodiment, the first chamfer 202 is used to initially guide the ball 6 to center, and the second chamfer 203 is used to further guide the ball 6 to center. At the same time, the contact area of ​​the seal is increased by making the ball 6 contact with the second chamfer 203, and the sealing effect and the reliability of the seal are further improved.

[0050] In this embodiment, preferably, the diameter of the ball 6 is 2 mm, the inner diameter of the vent hole 201 is 1.5 mm, the size of the first chamfer 202 is C0.5 mm, the thickness of the pole piece 2 is 2 mm, and the second chamfer 203 is an asymmetric chamfer, and the lengths of its two right-angled sides are 0.4 mm and 0.2 mm respectively.

[0051] It should be noted that the shape of the sealing member in the present invention includes but is not limited to spherical, semi-spherical, bottle stopper, etc., and its material includes but is not limited to metal steel, rubber, plastic, etc.

[0052] In summary, the relay of the utility model realizes sealing by opening a vent hole 201 leading to the sealed cavity 5 on the pole piece 2 and installing a ball 6 in the vent hole 201. This structure optimizes the sealing method, improves the reliability of the seal, and only one sealing point needs to be considered, so the airtightness is better and more stable, ensuring the electrical life of the product. At the same time, the design of sealing the vent hole 201 with the ball 6 also reduces the complexity of the sealing process, is more suitable for automated production, reduces production costs, and improves production efficiency. At the same time, by providing a first chamfer 202 and a second chamfer 203 in the vent hole 201, it can not only play a guiding and positioning role for the ball 6, but also increase the sealing contact area, further improving the sealing effect and the reliability of the seal.

[0053] In the above description, many specific details are described to facilitate a full understanding of 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 by the specific implementation disclosed above. At the same time, any person familiar with the technical field 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 an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification 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 falls within the scope of protection of the technical solution of the present invention.

Claims

1. A relay, comprising a ceramic cover (1) and a magnetic pole piece (2), wherein the ceramic cover (1) is sealedly connected to the magnetic pole piece (2) through a connecting ring (9) and a sealed cavity (5) is formed therebetween for accommodating a moving contact piece (3) and a stationary contact (4) of the relay; characterized in that: The magnetic pole piece (2) is provided with a vent hole (201) leading to the sealed cavity (5), and a sealing member for sealing the vent hole (201) is installed in the vent hole (201); wherein a first chamfer (202) is provided at one end of the magnetic pole piece (2) located at the vent hole (201) away from the sealed cavity (5).

2. The relay according to claim 1, characterized in that: The sealing member is a ball (6) having a diameter greater than the inner diameter of the vent hole (201). The ball (6) is inserted into the vent hole (201) along the first chamfer (202) in an interference fit manner.

3. The relay according to claim 2, characterized in that: The ball (6) is not completely pressed into the vent hole (201), and the ball (6) is in sealing contact with the first chamfer (202).

4. The relay according to claim 3, characterized in that: A plane parallel to the magnetic pole piece (2) and passing through the center of the ball (6) is used as a dividing interface (7), and the dividing interface (7) divides the ball (6) into an upper hemisphere (601) and a lower hemisphere (602). The hemispherical surface of the upper hemisphere (601) is arranged facing the sealing cavity (5), and the part where the ball (6) contacts the first chamfer (202) is located on the upper hemisphere (601).

5. The relay according to claim 2, characterized in that: The ball (6) is connected to the inner wall of the vent hole (201) in a secondary sealing manner by welding.

6. The relay according to claim 2, characterized in that: The magnetic pole piece (2) is located in the vent hole (201) and is also provided with a second chamfer (203) connected to the upper end of the first chamfer (202).

7. The relay according to claim 6, characterized in that: The second chamfer (203) is smaller than the first chamfer (202).

8. The relay according to claim 7, characterized in that: A plane parallel to the magnetic pole piece (2) and passing through the center of the ball (6) is used as a dividing interface (7), and the dividing interface (7) divides the ball (6) into an upper hemisphere (601) and a lower hemisphere (602). The hemispherical surface of the upper hemisphere (601) is arranged to face the sealing cavity (5), and the upper hemisphere (601) is in sealing contact with the second chamfer (203).

9. The relay according to claim 7, characterized in that: The size of the first chamfer (202) is 0.5 mm to 1 mm, and the size of the second chamfer (203) is 0.2 mm to 0.5 mm.

10. The relay according to claim 2, characterized in that: The diameter of the ball (6) is 2 mm to 3 mm, and the inner diameter of the vent hole (201) is 1 mm to 2.5 mm.

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