High-voltage direct-current relay

Abstract

The utility model relates to a high-voltage direct-current relay, and relates to the field of relays, the high-voltage direct-current relay comprises two groups of leading-out ends arranged on a shell and static contacts connected with the leading-out ends, a push rod is arranged in the shell in a sliding mode, one end of the push rod is connected with a movable contact assembly, and the other end of the push rod is connected with a push assembly. The pushing assembly is used for driving the pushing rod to slide, so that the movable contact assembly and the two groups of static contacts can form a closed circuit or an open circuit; the push rod is sleeved with a pressure spring and an insulating sleeve, one end of the pressure spring is connected with the movable contact assembly, and the other end of the pressure spring is inserted into the insulating sleeve and connected with the insulating sleeve. The tail end of the pressure spring is wrapped by the insulating sleeve, all-directional electrical isolation is provided, contact with an external conductive part is reduced, and the short circuit condition caused by accidental contact is effectively avoided.

Description

Technical Field

[0001] The present application relates to the field of relays, and in particular to a high-voltage direct current relay. Background Art

[0002] A DC relay is an electronic control device powered by direct current. It consists of a control system (also known as an input circuit) and a controlled system (also known as an output circuit) and is commonly used in automatic control circuits. It functions as an "automatic switch," providing automatic regulation, safety protection, and circuit switching.

[0003] In existing DC relays, to ensure more stable contact between the moving and stationary contacts, a compression spring is installed on the push rod. This spring pushes the moving and stationary contacts into contact, improving the stability of the contact. The end of the compression spring is supported by an insulating plate installed on the push rod. However, in high-voltage environments, the insulating plate only provides a single plane of electrical isolation. While this prevents the compression spring from directly contacting other conductive components, the exposed end of the compression spring can still form an unintended electrical connection through external paths or nearby conductive components, increasing the risk of short circuits. Utility Model Content

[0004] In order to improve the problem that the end of the compression spring is supported by an insulating plate, so that the end of the compression spring is exposed to the outside, which may form an unexpected electrical connection through an external path or nearby conductive parts, increasing the risk of short circuit, the present application provides a high-voltage DC relay.

[0005] The present application provides a high-voltage DC relay that adopts the following technical solution:

[0006] A high-voltage DC relay comprises two sets of lead terminals provided on a housing and static contacts connected to the lead terminals. A push rod is slidably provided within the housing, one end of the push rod being connected to a moving contact assembly, and the other end being connected to a push assembly. The push assembly is used to drive the push rod to slide so that the moving contact assembly can form a circuit or disconnect a circuit with the two sets of static contacts.

[0007] The push rod is sleeved with a compression spring and an insulating sleeve. One end of the compression spring is connected to the moving contact assembly, and the other end is inserted into and connected to the insulating sleeve.

[0008] By adopting the above technical solution, when the excitation signal acts on the pushing component, the pushing component pushes the moving contact component to slide through the pushing rod, so that the moving contact component contacts the two sets of static contacts, so that a high-voltage circuit is formed; the stroke of the moving contact component driven by the pushing rod is greater than the distance between the moving contact component and the static contacts. At this time, the compression spring contracts and presses the moving contact component against the static contacts to ensure that the moving contact component and the static contacts are in close contact; the end of the compression spring is inserted into the insulating sleeve, and the insulating sleeve wraps the end of the compression spring, providing all-round electrical isolation and reducing contact with external conductive parts. Even if the compression spring is subjected to force or slight displacement, it is still under the protection of the insulating sleeve, effectively avoiding short circuits caused by accidental contact; the insulating sleeve can also effectively isolate the arc and prevent the arc from propagating to the end of the compression spring. Even if an arc is generated in the contact area, the insulating sleeve can shield the arc from the outside, effectively avoiding short circuits caused by the influence of the arc on the compression spring.

[0009] In a specific possible implementation manner, the push rod is plugged with a support ring piece, and the insulating sleeve can be placed on the support ring piece to form support for the insulating sleeve.

[0010] By adopting the above technical solution, the supporting ring piece is inserted into the push rod to form support for the insulating sleeve, which facilitates the installation of the insulating sleeve.

[0011] In a specific possible implementation scheme, the moving contact assembly includes a conducting plate and an insulating member, the conducting plate is connected to the push rod through the insulating member, the compression spring abuts against the conducting plate, and the conducting plate can contact the two groups of static contacts to form a passage.

[0012] By adopting the above technical solution, the contact between the conducting plate and the static contact is utilized to achieve the connection between the two sets of static contacts, and the insulation between the conducting plate and the push rod is achieved by using the insulating member, so that the moving contact assembly and the push rod can maintain good electrical insulation.

[0013] In a specific possible implementation scheme, the pushing component includes an iron core and a coil, the iron core is fixedly connected to the pushing rod, and the iron core is passed through the coil so that when an excitation signal is applied to the coil, the iron core is affected by the electromagnetic force and can drive the pushing rod to move.

[0014] By adopting the above technical solution, when the excitation signal is applied to the coil, the coil generates a magnetic field and applies electromagnetic force to the iron core. Under the action of the electromagnetic force, the iron core drives the push rod to move, and the push rod drives the conduction plate to move toward the static contact and contact with the static contact, thereby turning on the high-voltage line, thereby realizing the control of the on and off of the relay and the line.

[0015] In a specific possible implementation scheme, the push rod is a bolt, which is inserted into the iron core and threadedly connected. The screw head of the push rod can form a limiting structure with the insulating member so that the push rod can pull the compression spring to compress.

[0016] By adopting the above technical solution, the threaded connection between the bolt and the iron core is utilized to improve the convenience of connecting the push rod and the iron core; the screw head of the bolt is utilized to form a limiting structure for the insulating part, thereby eliminating the need to set up an additional limiting structure, thereby improving the convenience of connecting the push rod and the conduction plate.

[0017] In a specific feasible implementation scheme, a magnetic yoke iron plate is provided in the shell, and the magnetic yoke iron plate divides the inner cavity of the shell into two chambers. The push rod is slidably passed through the magnetic yoke iron plate, and a metal tube is connected to the magnetic yoke iron plate. The metal tube and the magnetic yoke iron plate can form a closed chamber for placing the iron core, and the metal tube is passed through the coil.

[0018] By adopting the above technical solution, the closed chamber formed by the metal tube and the magnetic yoke iron plate can reduce the space for vacuum generation, thereby facilitating the formation of the vacuum chamber.

[0019] In a specific possible implementation scheme, a mounting seat is embedded in the magnetic yoke iron plate, the mounting seat is located in the metal cylinder, and the push rod is slidably inserted into the mounting seat.

[0020] By adopting the above technical solution and utilizing the sliding connection between the mounting seat and the push rod, the sliding guide distance of the push rod is increased and the sliding stability of the push rod is improved.

[0021] In a specific possible implementation scheme, a reset spring is provided between the mounting seat and the iron core, and the reset spring can drive the iron core to reset after power failure.

[0022] By adopting the above technical solution, when the push rod drives the conduction plate to contact the static contact, the reset spring is in a compressed state. When the excitation signal on the coil is disconnected, the electromagnetic force on the iron core is small, and the reset spring pushes the iron core to reset and drives the conduction plate to disengage from the static contact, so that the relay is in a disconnected state.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Insert the end of the compression spring into the insulating sleeve. The insulating sleeve wraps around the end of the compression spring, providing all-round electrical isolation and reducing contact with external conductive parts. Even if the compression spring is stressed or slightly displaced, it remains protected by the insulating sleeve, effectively preventing short circuits caused by accidental contact. The insulating sleeve can also effectively isolate arcs and prevent them from propagating to the end of the compression spring. Even if an arc occurs in the contact area, the insulating sleeve can shield the arc from the outside, effectively preventing the compression spring from short circuiting due to the arc.

[0025] 2. The threaded connection between the bolt and the iron core improves the convenience of connecting the push rod and the iron core; the screw head of the bolt forms a limiting structure for the insulating member, thereby eliminating the need for an additional limiting structure and improving the convenience of connecting the push rod and the conductive plate;

[0026] 3. Insert the support ring into the push rod to form a support for the insulating sleeve, making it easier to install the insulating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a high-voltage DC relay according to an embodiment of the present application.

[0028] Explanation of the accompanying reference numerals: 1. Shell; 11. Magnetic yoke iron plate; 12. Support ring; 21. Lead-out terminal; 22. Static contact; 3. Push rod; 4. Moving contact assembly; 41. Conductive plate; 42. Insulating member; 421. Insulating cylinder; 422. Extension; 423. Placement slot; 5. Push assembly; 51. Iron core; 52. Coil; 53. Metal cylinder; 54. Mounting seat; 55. Reset spring; 61. Compression spring; 62. Insulating sleeve. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 This application is described in further detail.

[0030] An embodiment of the present application discloses a high-voltage DC relay.

[0031] Reference Figure 1 A high-voltage DC relay includes a housing 1, lead terminals 21, static contacts 22, a push rod 3, a movable contact assembly 4, a push assembly 5, a compression spring 61, and an insulating sleeve 62. To accommodate the use of the relay under high-voltage conditions and reduce arcing, the interior of the housing 1 is evacuated to form a vacuum chamber. In this embodiment, two lead terminals 21 are used as an example. One end of each lead terminal 21 extends out of the housing 1 and can be connected to a wire in the circuit. The static contacts 22 correspond one-to-one with the lead terminals 21 and are located within the vacuum chamber within the housing 1.

[0032] Reference Figure 1A magnetic yoke iron plate 11 is fixedly provided in the shell 1. The magnetic yoke iron plate 11 divides the vacuum chamber into two chambers. The push rod 3 is slidably passed through the magnetic yoke iron plate 11. The moving contact assembly 4 is provided at one end of the push rod 3 and is located in one of the chambers. The push assembly 5 is provided at the other end of the push rod 3 and is located in the other chamber. The compression spring 61 and the insulating sleeve 62 are both sleeved on the push rod 3. A support ring 12 is embedded in the push rod 3. The insulating sleeve 62 can be placed on the support ring 12 to complete the installation of the insulating sleeve 62. One end of the compression spring 61 is connected to the moving contact assembly 4, and the other end is inserted into the insulating sleeve 62 and connected to the insulating sleeve 62, achieving the effect of all-round electrical isolation and effectively avoiding short circuits caused by accidental contact.

[0033] When an excitation signal acts on the push assembly 5, the push assembly 5 pushes the movable contact assembly 4 to slide via the push rod 3, causing the movable contact assembly 4 to contact the two sets of stationary contacts 22, thus completing the high-voltage circuit. The push rod 3 drives the movable contact assembly 4 to a distance greater than the distance between the movable contact assembly 4 and the stationary contacts 22. At this time, the compression spring 61 contracts and presses the movable contact assembly 4 against the stationary contacts 22, ensuring close contact between the movable contact assembly 4 and the stationary contacts 22.

[0034] Insert the end of the compression spring 61 into the insulating sleeve 62, which encases the end of the compression spring 61, providing all-round electrical isolation and reducing contact with external conductive parts. Even if the compression spring 61 is stressed or slightly displaced, it remains protected by the insulating sleeve 62, effectively preventing short circuits caused by accidental contact. The insulating sleeve 62 also effectively isolates arcs, preventing them from propagating to the end of the compression spring 61. Even if an arc occurs in the contact area, the insulating sleeve 62 can shield it from the outside, effectively preventing the compression spring 61 from short circuiting due to the arc.

[0035] Reference Figure 1 The moving contact assembly 4 in this embodiment includes a conducting plate 41 and an insulating member 42. The insulating member 42 is an insulating tube 421 made of ceramic material. The insulating tube 421 is passed through the conducting plate 41. The push rod 3 is passed through the insulating tube 421. One end of the insulating tube 421 extends outward along the circumferential direction to form an extension portion 422 that can overlap the conducting plate 41, and a placement groove 423 is provided on the extension portion 422 to communicate with the middle through hole of the insulating tube 421.

[0036] The push rod 3 includes two types: a bolt and a columnar rod. The push rod 3 can be made of stainless steel, and its diameter and length can be adjusted according to actual needs; or it can be made of aluminum alloy, and its diameter and length can be adjusted according to actual needs.

[0037] Specifically describing the structural features of the push rod 3: When the push rod 3 is in the form of a bolt, its head can be either a hexagonal bolt or a round-head bolt. A hexagonal bolt is easier to rotate with a wrench, while a round-head bolt is more aesthetically pleasing. Furthermore, when the push rod 3 is in the form of a bolt, the bolt head is inserted into the placement slot 423, allowing the push rod 3 to pull the conductive plate 41 downward, compressing the compression spring 61 and disengaging the conductive plate 41 from the static contact 22.

[0038] Reference Figure 1 The push assembly 5 in this embodiment includes an iron core 51 and a coil 52. A metal cylinder 53 is fixed to the magnetic yoke iron plate 11. The metal cylinder 53 is a cylindrical cylinder. A vacuum chamber is also formed between the metal cylinder 53 and the magnetic yoke iron plate 11. The push rod 3 passes through one end of the magnetic yoke iron plate 11 and extends into the metal cylinder 53. The iron core 51 is arranged inside the metal cylinder 53. The threaded portion of the push rod 3 is tightly coupled with the internal threaded portion of the iron core 51, thereby achieving a reliable connection between the push rod 3 and the iron core 51. The coil 52 is arranged inside the housing 1, and the metal cylinder 53 is inserted into the coil 52. The coil 52 is opposite to the iron core 51, so that when an excitation signal is applied to the coil 52, the iron core 51 is acted upon by the electromagnetic force and can drive the push rod 3 toward the static contact 22.

[0039] Reference Figure 1 A mounting seat 54 is provided on the magnetic yoke iron plate 11. A portion of the mounting seat 54 is embedded in the magnetic yoke iron plate 11, while the other portion is located within the metal tube 53. The push rod 3 slides through the mounting seat 54. The provision of the mounting seat 54 increases the sliding connection range of the push rod 3 and improves the sliding stability of the push rod 3. Grooves are formed on the side walls of the mounting seat 54 and the iron core 51 that face each other. A return spring 55 is sleeved on the push rod 3. The two ends of the return spring 55 are respectively inserted into the two grooves and abut against the mounting seat 54 and the iron core 51. When the coil 52 is energized to generate a magnetic field, the iron core 51 is acted upon by the magnetic field to generate an electromagnetic force, which drives the push rod 3 to move. The push rod 3 drives the conducting plate 41 to move and abut against the static contact 22 to achieve conduction of the relay. When the coil 52 is de-energized, the electromagnetic force acting on the iron core 51 disappears. At this time, the reset spring 55 pushes the iron core 51 to reset. The iron core 51 drives the conducting plate 41 to disengage from the static contact 22 through the push rod 3 to achieve power-off of the relay.

[0040] The high-voltage DC relay of this embodiment utilizes an insulating sleeve 62 to achieve full electrical isolation of the ends of a compression spring 61. Bolts, in conjunction with the iron core 51, form a reliable retaining structure, eliminating the risk of short circuits caused by the exposed ends of the compression spring 61 in existing technologies. This design not only improves the relay's stability in high-voltage environments but also optimizes its overall structure, enhancing the reliability of the DC relay.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A high voltage DC relay, characterized in that: The invention comprises two groups of lead-out terminals (21) provided on a housing (1) and static contacts (22) connected to the lead-out terminals (21); a push rod (3) is slidably provided in the housing (1); one end of the push rod (3) is connected to a moving contact assembly (4), and the other end is connected to a push assembly (5); the push assembly (5) is used to drive the push rod (3) to slide, so that the moving contact assembly (4) can form a circuit or a disconnection with the two groups of static contacts (22); The push rod (3) is sleeved with a compression spring (61) and an insulating sleeve (62); one end of the compression spring (61) is connected to the moving contact assembly (4), and the other end is inserted into and connected to the insulating sleeve (62).

2. The high-voltage DC relay according to claim 1, wherein: The push rod (3) is plugged with a support ring (12) sheet, and the insulating sleeve (62) can be placed on the support ring (12) sheet to form support for the insulating sleeve (62).

3. The high-voltage DC relay according to claim 1, wherein: The movable contact assembly (4) includes a conducting plate (41) and an insulating member (42), the conducting plate (41) is connected to the push rod (3) via the insulating member (42), the compression spring (61) abuts against the conducting plate (41), and the conducting plate (41) can contact the two groups of static contacts (22) to form a passage.

4. The high-voltage DC relay according to claim 3, wherein: The pushing assembly (5) includes an iron core (51) and a coil (52). The iron core (51) is fixedly connected to the pushing rod (3), and the iron core (51) is inserted into the coil (52) so that when an excitation signal is applied to the coil (52), the iron core (51) is acted upon by an electromagnetic force and can drive the pushing rod (3) to move.

5. The high-voltage DC relay according to claim 4, characterized in that: The push rod (3) is a bolt, which is inserted into the iron core (51) and threadedly connected. The screw head of the push rod (3) can form a limiting structure with the insulating member (42), so that the push rod (3) can pull the compression spring (61) to compress.

6. The high-voltage DC relay according to claim 4, characterized in that: A magnetic yoke iron plate (11) is provided in the shell (1), and the magnetic yoke iron plate (11) divides the inner cavity of the shell (1) into two chambers. The push rod (3) is slidably penetrated through the magnetic yoke iron plate (11), and a metal tube (53) is connected to the magnetic yoke iron plate (11). The metal tube (53) and the magnetic yoke iron plate (11) can enclose a closed chamber for placing the iron core (51), and the metal tube (53) is penetrated into the coil (52).

7. The high-voltage DC relay according to claim 6, characterized in that: A mounting seat (54) is embedded on the magnetic yoke iron plate (11), the mounting seat (54) is located in the metal cylinder (53), and the push rod (3) is slidably inserted into the mounting seat (54).

8. The high-voltage DC relay according to claim 7, characterized in that: A reset spring (55) is provided between the mounting seat (54) and the iron core (51), and the reset spring (55) can drive the iron core (51) to reset after power is cut off.

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