A high-voltage DC relay using magnetic steel instead of spring
By replacing springs with magnets, and using active and passive magnets to drive the moving and stationary contacts to connect or disconnect, and through modular structural design, the problem of insufficient insulation distance in high-voltage DC relays is solved, achieving higher creepage distance and operational reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG CLION RELAY
- Filing Date
- 2023-05-20
- Publication Date
- 2026-05-19
AI Technical Summary
Existing high-voltage DC relays have insufficient insulation distance between the electromagnetic mechanism and the contact system during operation, which fails to meet the usage requirements, resulting in a small creepage distance and low safety.
Magnets are used instead of springs. The movement and stationary contacts are connected or disconnected by the cooperation of active and passive magnets. The electromagnetic drive mechanism is separated from the contact assembly through a modular structure design, which increases the insulation distance.
The increased insulation distance between the contact assembly and the electromagnetic drive mechanism improves creepage distance and operational reliability, thereby enhancing safety and reliability.
Smart Images
Figure CN116613029B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of relays, and particularly relates to a high-voltage DC relay that uses a permanent magnet to replace a spring. Background Art
[0002] As an electronic control device, a relay uses media (tools) such as electricity, light, magnetism, heat, etc. (i.e., input quantities) to transfer and control circuits or signals (i.e., output quantities). It has a control system (also known as the input circuit) and a controlled system (also known as the output circuit), and couples the two circuits through an internal mechanical or electronic device to achieve the linkage of the states of the two circuits. Relays are usually applied in automatic control circuits. It is equivalent to an "automatic switch" and plays roles such as automatic regulation, safety protection, and circuit conversion in the circuit. When the existing high-voltage DC relay is working, a magnetic field is generated by the excitation of the coil of the electromagnetic mechanism, and the moving iron core moves upward to overcome the reaction forces of the reaction spring and the contact spring, and the moving contact of the contact system is closed with the static contact; when the coil excitation is removed, the magnetic field disappears, and the reaction spring and the contact spring separate the moving contact from the static contact; using the reaction spring and the contact spring to drive the moving iron core to reset results in a small insulation distance between the electromagnetic mechanism (low-voltage part) and the contact system (high-voltage part), so that the creepage distance cannot meet the usage requirements of this high-voltage DC relay. Summary of the Invention
[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a high-voltage DC relay that uses a permanent magnet to replace a spring, which has a simple structure, stable and reliable performance, a high creepage distance, and good insulation performance.
[0004] To achieve the above purpose, the present invention adopts a high-voltage DC relay that uses a permanent magnet to replace a spring, which includes a housing, an electromagnetic driving mechanism, and a contact system arranged on the electromagnetic driving mechanism. The contact system includes a ceramic cover arranged on the electromagnetic driving mechanism, and a contact component arranged in the ceramic cover. The contact component includes two static contacts arranged on the ceramic cover, a guiding shaft arranged in the ceramic cover, a moving contact slidably arranged on the guiding shaft, a passive permanent magnet slidably arranged on the guiding shaft and used to drive the moving contact to act, and a fixed permanent magnet arranged in the ceramic cover directly above the passive permanent magnet. The magnetic poles of the opposite sides of the fixed permanent magnet and the passive permanent magnet are the same. An active permanent magnet that is linked and cooperates with the electromagnetic driving mechanism and used to drive the passive permanent magnet to act is arranged in the housing. The passive permanent magnet moves with the active permanent magnet and can带动 the moving contact to slide on the guiding shaft, and can实现 the connection or disconnection of the moving contact and the two static contacts.
[0005] The beneficial effects of the above structure are as follows: The electromagnetic drive mechanism drives the passive magnet to move through the active magnet, and the passive magnet drives the moving contact to move, thereby realizing the connection between the moving contact and the stationary contact. The magnetic poles on the opposite side of the fixed magnet and the passive magnet are the same. When the moving contact performs the opening action, the fixed magnet can drive the moving contact to perform the opening action, thereby ensuring that the moving contact and the stationary contact can be reliably disconnected. The electromagnetic drive mechanism and the contact assembly adopt a magnetic structure drive method, which can separate the contact assembly and the electromagnetic drive mechanism. The contact assembly and the electromagnetic drive mechanism are respectively set in independent spaces, which can increase the insulation distance between the contact assembly (high voltage part) and the electromagnetic drive mechanism (low voltage part), resulting in a larger creepage distance and higher safety.
[0006] Specifically, the electromagnetic drive mechanism includes a U-shaped yoke, a yoke plate mounted on the U-shaped yoke, a coil frame positioned between the U-shaped yoke and the yoke plate, a coil mounted on the coil frame, a moving iron core positioned within the coil frame, and a push rod linked to the moving iron core. One end of the push rod extends outside the yoke plate and connects to the active magnet. A receiving groove is provided on the yoke plate corresponding to the active magnet. The active magnet moves with the push rod and can reciprocate within the receiving groove. The active magnet and the electromagnetic drive mechanism adopt a modular design, thereby separating the electromagnetic drive mechanism from the contact assembly. This increases the creepage distance between the low-voltage and high-voltage sections, improving the operational reliability of the high-voltage DC relay.
[0007] Specifically, a lower shielding plate is provided on the push rod corresponding to the active magnet, and the lower shielding plate is provided with a limiting groove that cooperates with the active magnet, with the active magnet engaging within the limiting groove. The lower shielding plate serves as a shield, preventing the active magnet from interfering with other components, thus improving the operational reliability of the high-voltage DC relay.
[0008] Specifically, the ceramic cover includes an insulating plate disposed on the yoke plate and a ceramic cover body disposed on the insulating plate. A receiving cavity for housing the contact assembly is formed between the insulating plate and the ceramic cover body. A stainless steel plate is disposed between the insulating plate and the yoke plate. The contact assembly is disposed within the receiving cavity, thereby separating the contact assembly from the electromagnetic drive mechanism. This increases the insulation distance between the contact assembly (high-voltage part) and the electromagnetic drive mechanism (low-voltage part), resulting in a larger creepage distance and improving the operational reliability of the high-voltage DC relay.
[0009] Specifically, the guide shaft is mounted on an insulating plate, and the passive magnet and moving contact are each provided with sliding holes that fit onto the guide shaft. A heat-insulating pad is provided on the guide shaft, separating the moving contact and the passive magnet. The passive magnet and moving contact are slidably mounted on the guide shaft, allowing them to operate reliably. Furthermore, the heat-insulating pad provides insulation, preventing the temperature of the moving contact from affecting the performance of the passive magnet, thus improving the operational reliability of the high-voltage DC relay.
[0010] Specifically, multiple guide protrusions are provided on the inner wall of the ceramic cover body corresponding to both sides of the moving contact. When the moving contact performs the opening and closing action, it can slide back and forth along the multiple guide protrusions. The multiple guide protrusions inside the ceramic cover body guide the moving contact, ensuring that the moving contact can reliably perform the opening and closing action. The guide protrusions guide the moving contact, ensuring that the moving contact can reliably perform the opening and closing action, which helps to improve the working reliability of the high-voltage DC relay.
[0011] Specifically, an upper shielding plate is provided inside the ceramic cover body between the two stationary contacts. The upper shielding plate has a positioning groove that mates with the fixed magnet, and the fixed magnet is engaged in the positioning groove. The upper shielding plate can provide shielding, preventing the fixed magnet from interfering with other components, which helps to improve the working reliability of the high-voltage DC relay. Attached Figure Description
[0012] Figure 1 This is a perspective view of an embodiment of the present invention.
[0013] Figure 2 This is a cross-sectional view of an embodiment of the present invention.
[0014] Figure 3 This is an exploded view of an embodiment of the present invention.
[0015] Figure 4 This is a perspective view of the ceramic cover body according to an embodiment of the present invention. Detailed Implementation
[0016] like Figures 1-4As shown, this embodiment of the invention is a high-voltage DC relay that uses a magnet instead of a spring, including a housing 10, an electromagnetic drive mechanism 20, and a contact system 30 disposed on the electromagnetic drive mechanism 20. The contact system 30 includes a ceramic cover 31 disposed on the electromagnetic drive mechanism 20 and a contact assembly 32 disposed within the ceramic cover 31. The contact assembly 32 includes two stationary contacts 33 disposed on the ceramic cover 31, a guide shaft 34 disposed within the ceramic cover 31, a moving contact 35 slidably disposed on the guide shaft 34, and a contact 35 slidably disposed on the guide shaft. A passive magnet 36 is mounted on the 34 and used to drive the moving contact 35 to move. A fixed magnet 37 is set inside the ceramic cover 31 directly above the passive magnet 36. The magnetic poles of the fixed magnet 37 and the passive magnet 36 are the same on the opposite side. An active magnet 40 is provided inside the housing 10, which is linked with the electromagnetic drive mechanism 20 and used to drive the passive magnet 36 to move. The passive magnet 36 moves with the active magnet 40 and can drive the moving contact 35 to slide on the guide shaft 34, and can realize the connection or disconnection of the moving contact 35 with the two stationary contacts 33. The electromagnetic drive mechanism 20 includes a U-shaped yoke 21, a yoke plate 22 mounted on the U-shaped yoke 21, a coil frame 23 positioned between the U-shaped yoke 21 and the yoke plate 22, a coil 24 mounted on the coil frame 23, a moving iron core 25 positioned within the coil frame 23, and a push rod 26 linked to the moving iron core 25. One end of the push rod 26 extends outside the yoke plate 22 and is connected to the active magnet 40. A receiving groove 221 is provided on the yoke plate 22 corresponding to the active magnet 40. The active magnet 40 moves with the push rod 26 and can reciprocate within the receiving groove 221. The active magnet and the electromagnetic drive mechanism adopt a modular design, which separates the electromagnetic drive mechanism from the contact assembly, thereby increasing the creepage distance between the low-voltage and high-voltage parts and improving the operational reliability of the high-voltage DC relay. A lower shielding plate 41 is provided on the push rod 26 corresponding to the active magnet 40. The lower shielding plate 41 is provided with a limiting groove 411 that cooperates with the active magnet 40, and the active magnet 40 is engaged in the limiting groove 411. The lower shielding plate can play a shielding role, preventing the active magnet from interfering with other components, which is conducive to improving the working reliability of the high voltage DC relay.
[0017] like Figures 2-4As shown, the ceramic cover 31 includes an insulating plate 311 disposed on the yoke plate 22 and a ceramic cover body 312 disposed on the insulating plate 311. A receiving cavity 310 for placing the contact assembly 32 is formed between the insulating plate 311 and the ceramic cover body 312. A stainless steel plate 11 is disposed between the insulating plate 311 and the yoke plate 22. The contact assembly is disposed in the receiving cavity, thereby separating the contact assembly from the electromagnetic drive mechanism, increasing the insulation distance between the contact assembly (high voltage part) and the electromagnetic drive mechanism (low voltage part), and resulting in a larger creepage distance, which is beneficial to improving the working reliability of the high voltage DC relay. The guide shaft 34 is disposed on the insulating plate 311. The passive magnet 36 and the moving contact 35 are respectively provided with sliding holes 300 fitted on the guide shaft 34. A heat insulation pad 38 is provided on the guide shaft 34 to separate the moving contact 35 and the passive magnet 36. The passive magnet and moving contact are slidably mounted on the guide shaft, ensuring reliable operation. The heat insulation pad provides insulation, preventing the temperature of the moving contact from affecting the performance of the passive magnet, thus improving the reliability of the high-voltage DC relay. Multiple guide protrusions 3121 are provided on the inner wall of the ceramic cover body 312, corresponding to both sides of the moving contact 35. When the moving contact 35 performs opening and closing actions, it can slide back and forth along the guide protrusions 3121. These guide protrusions within the ceramic cover body guide the moving contact, ensuring reliable opening and closing actions. This improved reliability of the high-voltage DC relay further enhances its operational reliability. An upper shielding plate 39 is provided inside the ceramic cover body 312 between the two stationary contacts 33. The upper shielding plate 39 is provided with a positioning groove 391 that cooperates with the fixed magnet 37. The fixed magnet 37 is engaged in the positioning groove 391. The upper shielding plate can play a shielding role, preventing the fixed magnet from interfering with other components, which is beneficial to improving the working reliability of the high-voltage DC relay.
[0018] The electromagnetic drive mechanism uses an active magnet to drive a passive magnet, which in turn moves the moving contact, thus connecting the moving and stationary contacts. The fixed and passive magnets share the same magnetic poles on opposite sides. When the moving contact opens, the fixed magnet drives it to perform the opening action, ensuring reliable disconnection between the moving and stationary contacts. The electromagnetic drive mechanism and contact assembly utilize a magnetic drive structure, separating them into independent spaces. This increases the insulation distance between the contact assembly (high-voltage section) and the electromagnetic drive mechanism (low-voltage section), resulting in greater creepage distance and higher safety.
[0019] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any 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 present invention, should fall within the protection scope of the present invention.
Claims
1. A high-voltage DC relay that uses a magnet instead of a spring, comprising a housing, an electromagnetic drive mechanism, and a contact system disposed on the electromagnetic drive mechanism, characterized in that: The contact system includes a ceramic cover mounted on an electromagnetic drive mechanism and a contact assembly inside the ceramic cover. The contact assembly includes two stationary contacts mounted on the ceramic cover, a guide shaft inside the ceramic cover, a movable contact slidably mounted on the guide shaft, a passive magnet slidably mounted on the guide shaft and used to drive the movable contact, and a fixed magnet positioned directly above the passive magnet inside the ceramic cover. The fixed magnet and the passive magnet share the same magnetic poles on opposite sides. An active magnet, linked to the electromagnetic drive mechanism and used to drive the passive magnet, is located inside the housing. The passive magnet moves with the active magnet and can drive the movable contact to slide on the guide shaft, enabling the movable contact to connect or disconnect from the two stationary contacts. The electromagnetic drive mechanism includes a U-shaped yoke, a yoke plate mounted on the U-shaped yoke, and a contact assembly... The structure includes a coil frame between the U-shaped yoke and the yoke plate, a coil mounted on the coil frame, a moving iron core mounted inside the coil frame, and a push rod linked to the moving iron core. One end of the push rod extends outside the yoke plate and is connected to the active magnet. A receiving groove is provided on the yoke plate corresponding to the active magnet. The active magnet moves with the push rod and can reciprocate within the receiving groove. The ceramic cover includes an insulating plate mounted on the yoke plate and a ceramic cover body mounted on the insulating plate. A receiving cavity for placing the contact assembly is formed between the insulating plate and the ceramic cover body. A stainless steel plate is provided between the insulating plate and the yoke plate. A guide shaft is mounted on the insulating plate. The passive magnet and the moving contact are respectively provided with sliding holes fitted onto the guide shaft. A heat insulation pad is provided on the guide shaft to separate the moving contact and the passive magnet.
2. The high-voltage DC relay using a magnet instead of a spring according to claim 1, characterized in that: The push rod is provided with a lower shielding plate corresponding to the active magnet, and the lower shielding plate is provided with a limiting groove that cooperates with the active magnet, and the active magnet is engaged in the limiting groove.
3. The high-voltage DC relay using a magnet instead of a spring according to claim 1, characterized in that: Multiple guide protrusions are respectively provided on the inner wall of the ceramic cover body corresponding to both sides of the moving contact. When the moving contact performs the opening and closing action, the moving contact can slide back and forth along the multiple guide protrusions.
4. The high-voltage DC relay using a magnet instead of a spring according to claim 1, characterized in that: An upper shielding plate is provided inside the ceramic cover body between two stationary contacts. The upper shielding plate is provided with a positioning groove that cooperates with the fixed magnet. The fixed magnet is engaged in the positioning groove.