A high-voltage direct-current relay with a double magnetic steel structure

Abstract

This utility model discloses a high-voltage DC relay with a dual-magnetic steel structure, comprising: a housing, two sets of stationary contacts arranged inside the housing with their tops extending to the outside of the housing, an inner support cover inside the housing, an outer iron core inside the inner support cover, a shaft body at the center of the outer iron core, a moving contact at the upper end of the shaft body, and a bracket at the lower part of the moving contact. This utility model uses a dual-magnetic steel structure made of ferrite and neodymium iron boron materials, which features high temperature resistance and strong magnetism. The temperature generated during relay operation has a relatively small impact on the magnets, avoiding the situation where the product's electrical life is shortened due to excessively high operating temperature. Furthermore, the structural changes of this new product broaden its applications, and the improved temperature resistance of the magnets enhances the stability of the relay during operation.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage DC relay technology, and more specifically to a high-voltage DC relay with a double magnet structure. Background Technology

[0002] High-voltage DC relays have been used in the new energy vehicle market for many years. Although their performance can basically meet the needs of customers, customers' requirements are constantly increasing, especially in terms of electrical life, because the standards for new energy vehicles are constantly being raised.

[0003] Currently, neodymium iron boron (NdFeB) magnets are used in high-voltage DC relays. While these magnets possess strong magnetic properties, their maximum operating temperature is only around 80°C, resulting in relatively low temperature resistance and a reduced overall electrical life. Ferrite magnets, on the other hand, have a maximum operating temperature of around 200°C and offer higher temperature resistance. However, their weaker magnetic properties also negatively impact the overall electrical life. Therefore, a new technical solution is needed to address this issue. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-voltage DC relay with a dual-magnetic steel structure to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-voltage DC relay with a double magnet structure, comprising: a housing, two sets of stationary contacts are disposed inside the housing and the tops of the stationary contacts extend to the outside of the housing, an inner support cover is disposed inside the housing and an outer iron core is disposed inside the inner support cover, a shaft body is disposed at the center of the outer iron core and a moving contact is disposed at the upper end of the shaft body, a bracket is disposed at the lower part of the moving contact, magnets are disposed on both sides of the moving contact and several sets of magnets are disposed, the magnets are composed of a ferrite layer and a neodymium iron boron layer, a moving iron core end cap is disposed at the lower part of the inner support cover and a frame is disposed at the lower part of the moving iron core end cap, a coil is disposed inside the frame, a bushing assembly is disposed on the side of the frame and a moving iron core body is disposed inside the bushing assembly, the moving iron core body is wrapped around the outside of the shaft.

[0006] In a preferred embodiment of the present invention, the top of the outer shell is provided with an outer cover, and the interior of the outer cover is provided with an opening that matches the stationary contact.

[0007] In a preferred embodiment of this utility model, snap rings are provided at both the upper and lower ends of the shaft body.

[0008] In a preferred embodiment of the present invention, a compression spring is provided on the surface of the shaft body, with the upper part of the compression spring extending to the inner side of the bracket and the lower part of the compression spring extending to the interior of the moving iron core body.

[0009] In a preferred embodiment of this utility model, the lower part of the magnet is provided with a guide plate and the surface of the guide plate forms a certain slope.

[0010] In a preferred embodiment of this utility model, a washer is provided between the snap ring and the guide plate.

[0011] In a preferred embodiment of this utility model, inserts are provided on both sides of the outer shell.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention employs a dual-magnet structure made of ferrite and neodymium iron boron materials, which features high temperature resistance and strong magnetism. The temperature generated during relay operation has minimal impact on the magnet, preventing low electrical life due to excessively high operating temperatures. Furthermore, the new product's structure has been modified, broadening its applications. The improved temperature resistance of this magnet in the relay enhances its operational stability. The high-voltage DC relay operates by the magnetic flux generated when the coil is energized, which passes through the magnetic circuit consisting of the moving iron core, outer iron core, moving iron core end cap, and working air gap. Under the influence of the magnetic field, the moving iron core is attracted to the moving iron core end cap, thereby closing the contacts and completing the circuit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cross-sectional structure of the relay of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the magnet of this utility model.

[0016] In the diagram: 1. Stationary contact; 2. Outer cover; 3. Outer shell; 4. Inner support cover; 5. Outer iron core; 6. Magnet; 7. Guide plate; 8. Moving iron core end cover; 9. Frame; 10. Insert; 11. Snap ring; 12. Moving contact; 13. Bracket; 14. Compression spring; 15. Washer; 16. Shaft body; 17. Moving iron core body; 18. Shaft sleeve assembly; 19. Coil; 20. Ferrite layer; 21. Neodymium iron boron layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-2 This utility model provides a technical solution: a high-voltage DC relay with a double magnet structure.

[0019] Regarding the aforementioned problems: In high-voltage DC relays, the magnets currently used are made of neodymium iron boron (NdFeB). While these magnets have the advantage of strong magnetism, their maximum operating temperature is only around 80°C, resulting in low temperature resistance and a reduced overall electrical life. Ferrite magnets, on the other hand, have a maximum operating temperature of around 200°C and higher temperature resistance. However, their magnetism is weaker, which also affects the overall electrical life of the product.

[0020] The solution is as follows: A high-voltage DC relay with a dual-magnetic steel structure includes: a housing 3, inside which two sets of stationary contacts 1 are arranged, with the top of the stationary contacts 1 extending to the outside of the housing 3; inside which an inner support cover 4 is arranged, and inside the inner support cover 4 is an outer iron core 5; a shaft body 16 is arranged at the center of the outer iron core 5, and a moving contact 12 is arranged at the upper end of the shaft body 16; a bracket 13 is arranged at the lower part of the moving contact 12; magnets 6 are arranged on both sides of the moving contact 12, and several sets of magnets 6 are arranged; the magnets 6 are composed of a ferrite layer 20 and a neodymium iron boron layer 21. The inner support cover 4 has a moving iron core end cover 8 at its lower part, and a frame 9 at its lower part. A coil 19 is provided inside the frame 9, and a bushing assembly 18 is provided on the side of the frame 9. A moving iron core body 17 is provided inside the bushing assembly 18. The moving iron core body 17 is wrapped around the shaft and has a double magnet 6 structure made of ferrite and neodymium iron boron materials. It has the characteristics of high temperature resistance and strong magnetism. The temperature generated when the relay is working has little impact on the magnet 6, avoiding the situation where the product's electrical life is low due to excessive product temperature during relay operation. Moreover, the structure of the new product has changed to a certain extent, making the product more widely used. Furthermore, since the magnet 6 is used in the relay, the temperature resistance is improved, making the relay more stable during operation. The working principle of the high voltage DC relay is that the magnetic flux generated after the coil 19 is energized passes through the magnetic circuit composed of the moving iron core, the outer iron core 5, the moving iron core end cover 8, and the working air gap of the magnetic circuit. Under the action of the magnetic field force, the moving iron core is attracted to the moving iron core end cover 8, thereby pushing the contacts to close and making the circuit conduct.

[0021] Further improvements, such as Figure 1 As shown: The top of the outer casing 3 is provided with an outer cover 2, and the interior of the outer cover 2 is provided with an opening that matches the stationary contact 1. The design of the outer cover 2 not only protects the internal structure of the relay, but also ensures the stable exposure of the stationary contact 1 and its connection with the external circuit by precisely matching the opening inside, thereby improving the reliability and safety of the connection.

[0022] Further improvements, such as Figure 1 As shown: Both the upper and lower ends of the shaft body 16 are provided with retaining rings 11. The retaining rings 11 effectively restrict the axial movement of the shaft body 16, enhance the stability of the shaft body 16, thereby ensuring the accurate docking and separation between the moving contact 12 and the stationary contact 1, and improving the switching performance of the relay.

[0023] Further improvements, such as Figure 1 As shown: A compression spring 14 is provided on the surface of the shaft body 16, and the upper part of the compression spring 14 extends to the inner side of the bracket 13. The lower part of the compression spring 14 extends to the interior of the moving iron core body 17. The design of the compression spring 14 provides additional elastic support for the shaft body 16, which helps to absorb and buffer vibration when the relay is working. At the same time, the elastic force of the compression spring 14 can also assist the rapid closing and separation of the moving contact 12, improving the response speed and stability of the relay.

[0024] Further improvements, such as Figure 1 As shown: The lower part of the magnet 6 is provided with a guide plate 7 and the surface of the guide plate 7 forms a certain slope. The design of the guide plate 7 makes it easier to position the magnet 6 during assembly, and its slope design helps to guide the magnetic lines of force of the magnet 6 when the relay is working, optimize the magnetic circuit, and improve the magnetic efficiency.

[0025] Further improvements, such as Figure 1 As shown: A washer 15 is provided between the retaining ring 11 and the guide plate 7. The washer 15 not only increases the contact area between the retaining ring 11 and the guide plate 7, but also reduces wear.

[0026] Further improvements, such as Figure 1 As shown: The housing 3 has inserts 10 on both sides. The design of the inserts 10 provides additional support and fixing points for the housing 3, which helps to install the relay more securely on the target device.

[0027] Working Principle: When the relay coil 19 is energized, a magnetic flux is generated. This flux passes through the magnetic circuit consisting of the moving iron core, the outer iron core 5, the moving iron core end cover 8, and the working air gap. At this time, the magnetic force begins to act, the moving iron core is magnetized and attracted by the magnetic force, and under the action of the magnetic force, the moving iron core begins to move and gradually approaches the moving iron core end cover 8. During this process, the movement of the moving iron core drives the shaft body 16 and the moving contact 12 connected to it to move together. As the moving iron core moves, the moving contact 12 also gradually approaches the stationary contact 1. When the moving contact 12 contacts the stationary contact 1, the circuit between them is completed, and the relay completes its closing action. At this time, the circuit controlled by the relay begins to work. When the relay coil 19 is de-energized, the magnetic field disappears. At this time, the moving iron core is no longer attracted by the magnetic force and begins to reset under the action of elastic elements such as the compression spring 14. As the moving iron core resets, the moving contact 12 also gradually moves away from the stationary contact 1. When the moving contact 12 is completely separated from the stationary contact 1, the relay completes the disconnection action. At this time, the circuit controlled by the relay is cut off. The high-voltage DC relay with the double magnet 6 structure realizes the reliable closing and opening of the circuit. Its double magnet 6 structure design not only improves the relay's temperature resistance and magnetic performance, but also makes the relay more stable during operation. The relay's fast response and long life also provide a strong guarantee for its application in high-voltage DC circuits.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0030] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-voltage DC relay with a double-magnetic steel structure, characterized in that: include: The outer casing (3) has two sets of stationary contacts (1) inside, with the top of the stationary contacts (1) extending to the outside of the outer casing (3). The outer casing (3) has an inner support cover (4) inside, and an outer iron core (5) inside the inner support cover (4). A shaft body (16) is provided at the center of the outer iron core (5), and a moving contact (12) is provided at the upper end of the shaft body (16). A bracket (13) is provided at the lower part of the moving contact (12), and magnets are provided on both sides of the moving contact (12). (6) The magnet (6) is provided in several groups. The magnet (6) is composed of a ferrite layer (20) and a neodymium iron boron layer (21). The lower part of the inner support cover (4) is provided with a moving iron core end cover (8) and the lower part of the moving iron core end cover (8) is provided with a skeleton (9). The inner side of the skeleton (9) is provided with a coil (19). The side of the skeleton (9) is provided with a bushing assembly (18) and the inner side of the bushing assembly (18) is provided with a moving iron core body (17). The moving iron core body (17) is wrapped around the outside of the shaft.

2. The high-voltage DC relay with a double-magnetic steel structure according to claim 1, characterized in that: The top of the outer casing (3) is provided with an outer cover (2), and the interior of the outer cover (2) is provided with an opening that matches the stationary contact (1).

3. The high-voltage DC relay with a double magnet structure according to claim 1, characterized in that: Both ends of the shaft body (16) are provided with snap rings (11).

4. A high-voltage DC relay with a double-magnetic steel structure according to claim 1, characterized in that: The surface of the shaft body (16) is provided with a compression spring (14), the upper part of the compression spring (14) extends to the inside of the bracket (13), and the lower part of the compression spring (14) extends to the inside of the moving iron core body (17).

5. A high-voltage DC relay with a double-magnetic steel structure according to claim 1, characterized in that: The lower part of the magnet (6) is provided with a guide plate (7) and the surface of the guide plate (7) is sloped.

6. A high-voltage DC relay with a double magnet structure according to claim 3, characterized in that: A washer (15) is provided between the snap ring (11) and the guide plate (7).

7. A high-voltage DC relay with a double-magnetic steel structure according to claim 1, characterized in that: The outer shell (3) is provided with inserts (10) on both sides.

Images