Anti-adhesion contact structure and relay

Abstract

The utility model discloses an anti-adhesion contact structure which comprises a movable contact piece, a static contact head, a movable contact fixed on the movable contact piece and a static contact fixed on the static contact head, the movable contact is used for moving along with the movable contact piece to abut against the static contact, and the static contact is used for moving along with the movable contact piece to abut against the static contact. Therefore, the movable contact piece is connected with the static contact head. Wherein the movable contact and the static contact are made of the same material. According to the utility model, the movable contact is fixed on the movable contact piece, and the movable contact and the static contact are made of the same material, so that the problem of material transfer caused by different materials can be fundamentally solved, the possibility of contact adhesion is greatly reduced, and the product failure caused by adhesion is avoided; the performance of the relay in the working process is more stable, the service life of the product is prolonged, reliable electrical connection and stable on-off operation are ensured, and the increasingly strict requirements of the market on the product are met.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to an anti-sticking contact structure and a relay. Background Technology

[0002] In the field of high-voltage relays, load life is a key indicator for measuring relay performance and also a weak point in current product testing. As the market evolves, customers are placing increasingly stringent requirements on relay load life.

[0003] In existing vacuum relay contact designs, the stationary contact head typically consists of an oxygen-free copper contact rod and a tungsten stationary contact welded onto it. This is based on the advantages of both materials. Oxygen-free copper has extremely high electrical conductivity, providing an excellent path for current transmission. This ensures that when the relay is conducting, the current can pass through the contact rod efficiently and with low loss, reducing energy loss and heat generation due to resistance. Simultaneously, its excellent thermal conductivity allows for rapid heat dissipation, maintaining a balanced internal temperature within the relay. However, oxygen-free copper has a relatively low melting point and limited resistance to arc erosion. Tungsten, on the other hand, has an extremely high melting point (3422℃) and good resistance to arc erosion, effectively resisting the high temperatures of an arc and reducing evaporation and sputtering of the contact material, thus compensating for the shortcomings of oxygen-free copper in this regard. Therefore, welding the tungsten stationary contact onto the oxygen-free copper contact rod allows the stationary contact head to possess both excellent electrical and thermal conductivity, as well as resistance to arc erosion.

[0004] Furthermore, in existing vacuum relay contact structure designs, the moving contact piece is typically made of molybdenum because molybdenum has a high melting point and good thermal stability. This allows it to withstand high temperatures without melting or deforming under the heat generated by frequent switching of the vacuum relay, ensuring reliable operation. Simultaneously, molybdenum's low vapor pressure makes it less prone to volatilization in a vacuum environment, helping to maintain a high vacuum level inside the relay, which is crucial for the arc-extinguishing and electrical insulation performance of the vacuum relay. Additionally, molybdenum possesses high mechanical strength and hardness, resisting the impact and friction generated during contact closing and opening during frequent operation, minimizing wear and deformation, and helping to maintain good contact conditions.

[0005] However, in high-current applications, when the moving contact and stationary contact of a relay come into contact, material transfer can occur due to the two different materials used in their contact area. This can easily lead to adhesion and ultimately, product failure. This adhesion problem caused by material differences severely impacts the relay's load life and makes it difficult to meet the increasingly stringent market demands for testing. Therefore, it is necessary to improve the existing technology to overcome its shortcomings. Utility Model Content

[0006] The problem to be solved by this utility model is to provide an anti-adhesion contact structure and relay, so as to overcome the defects of existing relay contact structures that are prone to adhesion, leading to product failure and reduced load life.

[0007] The technical solution adopted by this utility model to solve its technical problem is: an anti-adhesion contact structure, including: a moving contact piece, a stationary contact head, a moving contact fixed on the moving contact piece, and a stationary contact fixed on the stationary contact head. The moving contact is used to follow the movement of the moving contact piece and abut against the stationary contact, so that the moving contact piece and the stationary contact head are connected; wherein, the moving contact and the stationary contact are made of the same material.

[0008] As a further improvement of this utility model, the material of the moving contact is different from the material of the moving contact piece, and the material of the stationary contact is different from the material of the stationary contact head.

[0009] As a further improvement of this utility model, both the moving contact and the stationary contact are made of tungsten.

[0010] As a further improvement of this utility model, the moving contact piece is made of molybdenum, and the stationary contact head is made of oxygen-free copper.

[0011] As a further improvement of this utility model, the moving contact is fixed to the moving contact piece by any one of welding, riveting, or plugging.

[0012] As a further improvement of this utility model, a positioning groove is provided on one side of the moving contact piece, and the moving contact is welded to the positioning groove by a solder sheet.

[0013] As a further improvement of this utility model, one end of the moving contact piece is provided with a U-shaped insertion part, and the moving contact is an "I" shape with large size at both ends and small size in the middle, with a slot formed in the middle part, and the insertion part is inserted into the slot in an interference fit manner.

[0014] As a further improvement of this utility model, at least two stationary contact heads are provided, and the stationary contact point on one of the stationary contact heads is provided with a limiting groove. The moving contact point is fixed to one end of the moving contact piece and is arranged opposite to the stationary contact point on the other stationary contact head. The other end of the moving contact piece extends into the limiting groove. When the moving contact piece and the stationary contact head switch between the connected state and the disconnected state, the other end of the moving contact piece abuts against the two side walls of the limiting groove respectively.

[0015] This utility model also provides a relay, including the anti-sticking contact structure described above.

[0016] As a further improvement of this utility model, the relay also includes an electromagnetic mechanism, a transmission mechanism, and a sealed housing. The stationary contact head is fixedly inserted into the sealed housing, and the stationary contact point is located in the vacuum chamber inside the sealed housing. At the same time, the moving contact piece and the moving contact point thereon are also located in the vacuum chamber. The electromagnetic mechanism is disposed at the bottom of the sealed housing. The moving contact piece is driven to the electromagnetic mechanism through the transmission mechanism. The electromagnetic mechanism is used to drive the moving contact piece to rotate through the transmission mechanism to connect or disconnect from the stationary contact head.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model provides an anti-adhesion contact structure and relay. By fixing the moving contact on the moving contact piece and making the moving contact and the stationary contact the same material, the material transfer problem caused by different materials can be fundamentally solved, greatly reducing the possibility of contact adhesion and avoiding product failure caused by adhesion. This makes the relay's performance more stable during operation and extends the product's service life. Whether under harsh conditions of high voltage and high current or during long-term continuous operation, it can ensure reliable electrical connection and stable switching operation, meet the increasingly stringent market requirements for products, and enhance the product's competitiveness in the market.

[0019] 2. This utility model uses molybdenum for the moving contact piece and oxygen-free copper for the stationary contact head. This allows the moving contact piece to still exhibit the high melting point, low vapor pressure, and high mechanical strength of molybdenum, while the stationary contact head continues to exhibit the excellent electrical and thermal conductivity of oxygen-free copper. At the same time, by combining the moving and stationary contacts with tungsten material, an optimized combination of material properties is achieved. This allows the contact structure to have both good electrical and thermal conductivity as well as resistance to arc erosion, thus comprehensively improving the overall performance of the relay contact structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of Embodiment 1 of the anti-adhesion contact structure of this utility model;

[0022] Figure 2 This is a top view of Embodiment 1 of the anti-adhesion contact structure of this utility model;

[0023] Figure 3This is a perspective view of the moving contact piece and moving contact in Embodiment 1 of the anti-adhesion contact structure of this utility model;

[0024] Figure 4 This is an exploded view of the moving contact piece and moving contact in Embodiment 1 of the anti-adhesion contact structure of this utility model;

[0025] Figure 5 This is a perspective view of the moving contact piece in Embodiment 2 of the anti-adhesion contact structure of this utility model;

[0026] Figure 6 This is a cross-sectional view of the moving contact in Embodiment 2 of the anti-adhesion contact structure of this utility model;

[0027] Figure 7 This is a perspective view of Embodiment 3 of the anti-adhesion contact structure of this utility model;

[0028] Figure 8 This is a perspective view of the relay of this utility model;

[0029] Figure 9 This is a perspective view of the relay of this utility model after the sealing housing has been removed.

[0030] Referring to the accompanying drawings, the following explanations are provided:

[0031] 1. Moving contact piece; 101. Positioning groove; 102. Insertion part; 103. Hanging lug;

[0032] 2. Stationary contact head; 3. Moving contact; 301. Slot; 4. Stationary contact; 401. Limiting slot; 5. Solder sheet; 6. Electromagnetic mechanism; 7. Transmission mechanism; 701. Transmission shaft; 8. Sealed housing. Detailed Implementation

[0033] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0034] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0036] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0037] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0038] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0039] Example 1

[0040] See Figures 1 to 4 This utility model provides an anti-sticking contact structure, including: a moving contact piece 1, a stationary contact head 2, a moving contact 3, and a stationary contact 4.

[0041] like Figure 1 As shown, in this embodiment, the moving contact piece 1 is sheet-shaped and is arranged in a vertical direction; the stationary contact head 2 is rod-shaped and is arranged in a horizontal direction, with one end of the stationary contact head 2 extending toward the moving contact piece 1.

[0042] Furthermore, the moving contact 3 is fixed to one side of the moving contact piece 1, and the stationary contact 4 is fixed to one end of the stationary contact head 2. The moving contact 3 and the stationary contact 4 are arranged opposite to each other. The moving contact 3 is used to follow the movement of the moving contact piece 1 and abut against the stationary contact 4 so that the moving contact piece 1 and the stationary contact head 2 are connected.

[0043] It is worth mentioning that the moving contact 3 and the stationary contact 4 are made of the same material. This invention, by fixing the moving contact 3 to the moving contact piece 1 and using the same material for both the moving contact 3 and the stationary contact 4, fundamentally solves the material transfer problem caused by different materials, greatly reducing the possibility of contact adhesion and preventing product failure due to adhesion. This makes the relay's performance more stable during operation, extends the product's lifespan, and ensures reliable electrical connection and stable switching operation under harsh conditions of high voltage and high current, as well as during long-term continuous operation. This meets the increasingly stringent market requirements and enhances the product's competitiveness in the market.

[0044] Preferably, both the moving contact 3 and the stationary contact 4 are made of tungsten. Tungsten has an extremely high melting point and good resistance to arc erosion, which can effectively resist the high temperature of the arc and reduce the evaporation and sputtering of the contact material.

[0045] In this invention, the moving contact 3 is made of a different material than the moving contact piece 1, and the stationary contact 4 is made of a different material than the stationary contact head 2. Specifically, the moving contact piece 1 is made of molybdenum, and the stationary contact head 2 is made of oxygen-free copper. By using molybdenum for the moving contact piece 1 and oxygen-free copper for the stationary contact head 2, this invention allows the moving contact piece 1 to still exhibit the high melting point, low vapor pressure, and high mechanical strength of molybdenum, while the stationary contact head 2 can continue to exhibit the good electrical and thermal conductivity of oxygen-free copper. Simultaneously, by combining the moving contact 3 and stationary contact 4 made of tungsten, an optimized combination of material properties is achieved, enabling the contact structure to possess both good electrical and thermal conductivity as well as resistance to arc erosion, thus comprehensively improving the overall performance of the relay contact structure.

[0046] like Figure 3 and Figure 4 As shown, a positioning groove 101 is provided on one side of the moving contact piece 1, and the moving contact 3 is welded to the positioning groove 101 by a solder sheet 5. The specific welding process is as follows: first, the solder sheet 5 is placed in the positioning groove 101, then the tungsten moving contact 3 is placed in, and then it is sent into a high-temperature furnace for high-temperature heating to melt the solder sheet 5 so as to weld the moving contact 3 into the positioning groove 101.

[0047] For example, the moving contact 3 is in the shape of a disc.

[0048] See Figure 1 and Figure 2In this embodiment, three stationary contacts 2 are provided: a common stationary contact, a normally closed stationary contact, and a normally open stationary contact. The normally closed and normally open stationary contacts are symmetrically distributed in a figure-eight shape on the left and right sides of the moving contact piece 1, and the moving contact 3 is opposite to the stationary contact 4 on the normally open stationary contact. The common stationary contact is located on the axis of symmetry of the normally closed and normally open stationary contacts. The stationary contact 4 on the common stationary contact is provided with a limiting groove 401, and the other end of the moving contact piece 1 extends into the limiting groove 401.

[0049] In this invention, the moving contact piece 1 is mounted on the drive shaft 701 of the relay. Specifically, as shown... Figure 1 and Figure 3 As shown, the moving contact piece 1 has mounting plates extending from its center in both vertical and horizontal directions. These mounting plates are bent vertically in the same direction to form two lugs 103, each with a through hole. The moving contact piece 1 is mounted on the relay's drive shaft 701 via the two lugs 103, allowing it to follow the drive shaft 701 during relay energization and de-energization switching. It can also rotate around the drive shaft 701, causing the moving contact 3 to either abut against or disconnect from the normally open stationary contact 4.

[0050] For example, when the relay is de-energized, under the force of the drive shaft 701, one end of the moving contact piece 1 remains in contact with the stationary contact 4 of the normally closed stationary contact head on the side opposite to the moving contact 3; when the relay is energized, the drive shaft 701 actuates and drives the moving contact piece 1 to rotate, so that the moving contact piece 1 breaks away from the stationary contact 4 of the normally closed stationary contact head, until the moving contact 3 abuts against the stationary contact 4 of the normally open stationary contact head (e.g., Figure 2 (As shown). During the process of switching from connecting the moving contact piece 1 to the normally closed stationary contact head to connecting it to the normally open stationary contact head, the other end of the moving contact piece 1 is in contact with the two side walls of the limiting groove 401 respectively, so as to ensure that the moving contact piece 1 can stably contact the common stationary contact head in both states.

[0051] It should be noted that in this embodiment, the common stationary contact and the normally open stationary contact are used for electrical connection to a high current load, while the normally closed stationary contact can serve as a limiting contact.

[0052] Example 2

[0053] The difference between this embodiment and Embodiment 1 is that the moving contact 3 and the moving contact piece 1 are fixed in different ways.

[0054] Specifically, see Figure 5 and Figure 6One end of the moving contact piece 1 is provided with a U-shaped insertion part 102. The moving contact 3 is in the shape of an "I" with large size at both ends and small size in the middle, thus forming an annular slot 301 in the middle part. The insertion part 102 is inserted into the slot 301 in an interference fit manner, thereby realizing the fixed connection between the moving contact 3 and the moving contact piece 1.

[0055] Compared with Embodiment 1, this embodiment uses an "I"-shaped moving contact 3 to be inserted into and interference-fitted with the moving contact piece 1, so that the two ends of the moving contact 3 are distributed on both sides of the moving contact piece 1. That is, tungsten material contact parts are formed on both sides of one end of the moving contact piece 1, which are used to contact the stationary contact 4 of the normally closed stationary contact head and the stationary contact 4 of the normally open stationary contact head, respectively.

[0056] In addition, in other embodiments of this utility model, the moving contact 3 and the moving contact piece 1 can also be fixed by riveting. For example, a protrusion is provided on the moving contact 3, and a hole matching the protrusion is provided on the moving contact piece 1. During installation, the protrusion is inserted into the hole and riveted, thereby achieving a fixed connection between the moving contact 3 and the moving contact piece 1.

[0057] Example 3

[0058] See Figure 7 The difference between this embodiment and embodiment one is that: in this embodiment, there are only two stationary contact heads 2, namely the common stationary contact head and the normally open stationary contact head as described in embodiment one, and there is no normally closed stationary contact head.

[0059] Example 4

[0060] This utility model also provides a relay, including the anti-sticking contact structure as described in any one of Embodiments 1 to 3.

[0061] See Figure 8 and Figure 9 In this embodiment, the relay further includes an electromagnetic mechanism 6, a transmission mechanism 7, and a sealed housing 8. Three stationary contacts 2 are provided, all fixedly inserted into the circumferential surface of the sealed housing 8, with their stationary contacts 4 extending into the vacuum chamber inside the sealed housing 8. A moving contact 1 is mounted on the transmission shaft 701 of the transmission mechanism 7, and the transmission mechanism 7, the moving contact 1, and its moving contacts 3 are also located in the vacuum chamber. The electromagnetic mechanism 6 is located at the bottom of the sealed housing 8. The moving contact 1 is connected to the electromagnetic mechanism 6 via the transmission mechanism 7. The electromagnetic mechanism 6 drives the moving contact 1 to rotate via the transmission mechanism 7, thereby switching the moving contact 1 between a normally open stationary contact and a normally closed stationary contact.

[0062] The electromagnetic mechanism 6, the transmission mechanism 7, and the sealed housing 8 all adopt existing conventional technologies and are not considered as improvements in this application. Therefore, their specific structures will not be described in detail.

[0063] Therefore, this utility model provides an anti-adhesion contact structure and relay. By fixing the moving contact 3 on the moving contact piece 1 and making the moving contact 3 and the stationary contact 4 the same material, the material transfer problem caused by different materials can be fundamentally solved, greatly reducing the possibility of contact adhesion and avoiding product failure caused by adhesion. This makes the relay's performance more stable during operation and extends the product's service life. Whether under harsh conditions of high voltage and high current or during long-term continuous operation, it can ensure reliable electrical connection and stable switching operation, meeting the increasingly stringent market requirements for products and enhancing the product's competitiveness in the market.

[0064] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An anti-adhesion contact structure, characterized in that, include: The device comprises a moving contact piece (1), a stationary contact head (2), a moving contact (3) fixed on the moving contact piece (1), and a stationary contact (4) fixed on the stationary contact head (2). The moving contact (3) is used to follow the movement of the moving contact piece (1) and abut against the stationary contact (4) so ​​that the moving contact piece (1) and the stationary contact head (2) are connected. The moving contact (3) and the stationary contact (4) are made of the same material.

2. The anti-adhesion contact structure according to claim 1, characterized in that: The material of the moving contact (3) is different from that of the moving contact piece (1), and the material of the stationary contact (4) is different from that of the stationary contact head (2).

3. The anti-adhesion contact structure according to claim 2, characterized in that: Both the moving contact (3) and the stationary contact (4) are made of tungsten.

4. The anti-adhesion contact structure according to claim 3, characterized in that: The moving contact piece (1) is made of molybdenum, and the stationary contact head (2) is made of oxygen-free copper.

5. The anti-adhesion contact structure according to claim 1, characterized in that: The moving contact (3) is fixed to the moving contact piece (1) by any one of welding, riveting, or plugging.

6. The anti-adhesion contact structure according to claim 1, characterized in that: The moving contact piece (1) has a positioning groove (101) on one side, and the moving contact (3) is welded to the positioning groove (101) by a solder piece (5).

7. The anti-adhesion contact structure according to claim 1, characterized in that: One end of the moving contact piece (1) is provided with a U-shaped plug-in part (102), and the moving contact (3) is an "I" shape with large size at both ends and small size in the middle, and a slot (301) is formed in the middle part. The plug-in part (102) is inserted into the slot (301) in an interference fit manner.

8. The anti-adhesion contact structure according to claim 1, characterized in that: At least two stationary contact heads (2) are provided, and the stationary contact point (4) on one of the stationary contact heads (2) is provided with a limiting groove (401). The moving contact point (3) is fixed to one end of the moving contact piece (1) and is arranged opposite to the stationary contact point (4) on the other stationary contact head (2). The other end of the moving contact piece (1) extends into the limiting groove (401). When the moving contact piece (1) and the stationary contact head (2) switch between the connected state and the disconnected state, the other end of the moving contact piece (1) abuts against the two side walls of the limiting groove (401).

9. A relay, characterized in that: Includes the anti-sticking contact structure as described in any one of claims 1 to 8.

10. The relay according to claim 9, characterized in that: It also includes an electromagnetic mechanism (6), a transmission mechanism (7), and a sealing housing (8). The stationary contact head (2) is fixedly inserted into the sealing housing (8), and the stationary contact point (4) is located in the vacuum chamber inside the sealing housing (8). At the same time, the moving contact piece (1) and the moving contact point (3) on it are also located in the vacuum chamber. The electromagnetic mechanism (6) is located at the bottom of the sealing housing (8). The moving contact piece (1) is connected to the electromagnetic mechanism (6) through the transmission mechanism (7). The electromagnetic mechanism (6) is used to drive the moving contact piece (1) to rotate through the transmission mechanism (7) to connect or disconnect from the stationary contact head (2).

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