High-voltage relay structure capable of resisting short-circuit large current

Abstract

The utility model relates to a relay structure. A high-voltage relay structure resistant to short-circuit large current comprises a shell, a static contact piece and a movable contact piece are arranged in the shell, the movable contact piece is installed on a push rod, upper magnetic conductive pure iron is arranged above the movable contact piece, lower magnetic conductive pure iron is arranged below the movable contact piece, the upper magnetic conductive pure iron is fixed on the push rod, the lower magnetic conductive pure iron is fixed on the movable contact piece, and the upper magnetic conductive pure iron and the lower magnetic conductive pure iron are fixed on the push rod. After the movable contact is electrified, a magnetic field is formed, and the upper magnetic-conductive pure iron and the lower magnetic-conductive pure iron generate magnetic force and tend to attract each other. The utility model provides the high-voltage relay structure capable of resisting the short-circuit large current, which is simple in structure, capable of allowing the large current to pass through and ensuring the stability of the relay structure, and good in use performance; the technical problems that in the prior art, a circuit through which a high-voltage relay passes is small, short circuit is likely to occur when large current occurs, and performance is unstable are solved.

Description

Technical Field

[0001] The utility model relates to a high-voltage relay structure, in particular to a high-voltage relay structure capable of resisting short-circuit and high-current. Background Art

[0002] A high-voltage relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. A high-voltage relay is an electrical device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) of the high-voltage circuit reaches the specified requirements.

[0003] Relays are commonly used components in control circuits. They change the controlled quantity in the circuit by changing the input quantity, thereby achieving the purpose of automatic control and regulation. They are widely used in new energy vehicles, charging piles, power electronic energy storage stations and other equipment. Especially in the control field of high-voltage circuits, relays undertake important execution tasks. Through the isolated operation of the working coil, the high-voltage circuit can be closed and cut off. Its working performance is related to the safe use of the high-voltage circuit, so it needs to have good current cutting capability and overload performance.

[0004] The current high-voltage relay usually includes a housing, in which there are push rods, moving contacts and static contacts. The contact and disconnection of the moving contacts and static contacts ensure the on and off of the relay. The current relay generally allows a current of about 300A, but for special occasions, the current that needs to pass is sometimes about 8000A. For relays with high current requirements, the existing structure can no longer meet the requirements. The existing structure cannot normally complete the scheduled execution tasks. Summary of the invention

[0005] The utility model provides a high-voltage relay structure with a simple structure, which can allow a large current to pass through and ensure the stability of the relay structure and has good performance in use and is resistant to short circuits and large currents; the utility model solves the technical problems in the prior art that the high-voltage relay has a small current, is prone to short circuits when encountering a large current, and has unstable performance.

[0006] The utility model also provides a high-voltage relay structure that is easy to assemble, can ensure the performance of the relay and improve safety, and can resist short-circuit and high current; it solves the technical problems in the prior art that the coil of the high-voltage relay is easily broken down, resulting in failure in use, and the assembly structure of the existing high-voltage relay is complicated.

[0007] The above technical problem of the utility model is solved by the following technical solution: a high-voltage relay structure for resisting short-circuit large current, including a housing, a static contact and a moving contact are arranged in the housing, the moving contact is installed on a push rod, an upper magnetic pure iron is arranged above the moving contact, and a lower magnetic pure iron is arranged below the moving contact, the upper magnetic pure iron is fixed on the push rod, and the lower magnetic pure iron is fixed on the moving contact, and a magnetic field is formed when the moving contact is energized, and the upper magnetic pure iron and the lower magnetic pure iron generate magnetic force and tend to attract each other. Thus, it plays a role in resisting short-circuit large current. The push rod drives the moving contact to move upward, and the moving contact and the static contact are connected to realize the conduction of the circuit. Because the upper magnetic pure iron is fixed on the push rod and the lower magnetic pure iron is fixed on the moving contact, the upper magnetic pure iron and the lower magnetic pure iron also move upward together. After the circuit is turned on, current passes through the moving contact to generate a magnetic field, and the upper magnetic pure iron and the lower magnetic pure iron generate magnetic force to attract each other because of the magnetic field. Because the upper magnetic pure iron is fixed above the moving contact, at the top of the push rod, when the upper and lower magnetic pure iron attract each other, it will add an upward magnetic force to the moving contact, making the moving contact and the static contact fit more firmly, thereby increasing the current passing through and preventing short circuit.

[0008] Preferably, the upper magnetic pure iron and the lower magnetic pure iron are made of electrical pure iron, which generates magnetic force under high current, making the moving contact and the static contact fit more firmly.

[0009] Preferably, the upper magnetic pure iron has a through hole at its center, the push rod is a stepped shaft, and the upper magnetic pure iron is fixed to the push rod by a locking nut. The stepped shaft is used to position the upper magnetic pure iron, and then the nut is locked, which has a simple structure and is easy to install.

[0010] Preferably, the cross section of the upper magnetic pure iron is U-shaped, and the moving contact is located in the U-shaped groove of the upper magnetic pure iron. The U-shaped groove can provide a guide for the moving contact to move in the direction of the upper magnetic pure iron, thereby ensuring the stability of the moving contact.

[0011] Preferably, the lower magnetic pure iron is provided with a fixing hole, the movable contact is provided with a boss, and the boss is interference fit with the fixing hole of the lower magnetic pure iron. The boss is directly inserted into the fixing hole, and the lower magnetic pure iron is fixed to the movable contact by interference fit.

[0012] Preferably, the movable contact is connected to the push rod through a spring, and the push rod includes an upper push rod and a lower push rod, which are connected through an insulating member, one end of the upper push rod passes through a through hole on the movable contact, and the spring is installed on the upper push rod, one end of the spring abuts against the movable contact, and the other end of the spring abuts against the upper end surface of the insulating member; the lower push rod is located in the through hole of the magnetic circuit system structure below the shell. The upper push rod and the lower push rod are connected to different voltages, and the two are connected by an insulating member, so that the voltages of the upper push rod and the lower push rod will not affect each other, reducing the risk of the coil being broken down and improving the safety of the relay. At the same time, the spring is directly sleeved on the upper push rod and connected to the movable contact, which is convenient to install and can be installed in sequence.

[0013] Preferably, the upper end surface of the insulating member is provided with an upper connecting groove fixedly connected to the upper push rod, the end of the upper push rod is provided with an upper protrusion structure matched with the upper connecting groove, the upper end surface of the insulating member is provided with a lower connecting groove fixedly connected to the upper push rod, and the end of the lower push rod is provided with a lower protrusion structure matched with the lower connecting groove. The upper end surface of the insulating member is provided with a lower connecting groove fixedly connected to the upper push rod, and the end of the lower push rod is provided with a lower protrusion matched with the lower connecting groove.

[0014] Upper and lower connecting grooves are arranged on the insulating member to respectively install the upper and lower push rods, and the upper connecting groove and the lower connecting groove are not connected, so that the upper push rod and the lower push rod are isolated by the insulating member, and at the same time, the upper push rod and the lower push rod are conveniently on the same axis, which is convenient for installation.

[0015] Preferably, the upper push rod and the lower push rod are made of stainless steel, and the insulating member is a plastic insulating member, which plays a role in insulating and isolating high voltage.

[0016] Therefore, the utility model has the following advantages for a high-voltage relay structure that can resist short-circuit and high current: electrical pure iron is installed on the upper and lower sides of the moving contact, and magnetic force can be generated after the moving contact is energized, thereby further improving the reliability of the connection between the moving contact and the static contact, increasing the short-circuit current from the original 300A to 8000A, and ensuring the stability of the circuit. At the same time, the upper push rod and the lower push rod are divided by an insulating member to effectively prevent the coil from being broken down, ensuring the safety of the relay; each component is installed in a superimposed manner, which is convenient for assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the structure of a high-voltage relay that can withstand short circuits and high currents.

[0018] Figure 2 yes Figure 1 A three-dimensional diagram of the moving contact, static contact, and upper and lower magnetic pure iron.

[0019] Figure 3 yes Figure 2 A cross-sectional view in one direction.

[0020] Figure 4 yes Figure 2 A cross-sectional view from another direction. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Example:

[0023] like Figure 1 and 2 As shown in Figures 3 and 4, a high-voltage relay structure that resists short-circuit and large current includes a housing 1, and a yoke iron plate 13 is installed at the center of the housing 1. The yoke iron plate 13 divides the space in the housing into an upper cavity and a lower cavity. A coaxially arranged coil 8 and an iron core 7 are installed in the lower cavity. A moving contact 3 is installed in the upper cavity, and a static contact 2 is also installed on the housing 1. There are two static contacts 2, which are located above the moving contact 3.

[0024] A plastic insulating part 6 is installed above the yoke iron plate 13, and a metal upper push rod 4 and a metal lower push rod 5 are connected to the upper and lower parts of the plastic insulating part respectively. The upper and lower end faces of the plastic insulating part 6 are respectively provided with an upper connecting groove and a lower connecting groove. The end of the metal upper push rod 4 is provided with an upper protrusion that cooperates with the upper connecting groove, and the end of the metal lower push rod 5 is provided with a lower protrusion that cooperates with the lower connecting groove.

[0025] The metal upper push rod 4 is a stepped shaft, and the movable contact 3 is sleeved on the metal upper push rod 4. An upper magnetic pure iron 10 is installed above the movable contact 3, and a lower magnetic pure iron 11 is installed below the movable contact 3. The upper magnetic pure iron 10 and the lower magnetic pure iron 11 are both made of electrical pure iron. A through hole is provided in the center of the upper magnetic pure iron 10. The upper magnetic pure iron 10 is installed at the stepped shaft of the metal upper push rod 4, positioned by the stepped shaft, and then fixed to the metal upper push rod 4 by a nut 9 on the upper magnetic pure iron. The cross section of the upper magnetic pure iron 10 is U-shaped, and the movable contact 3 is located in the U-shaped groove of the upper magnetic pure iron.

[0026] Two bosses 12 are integrally formed below the movable contact 3 , and two fixing holes are provided on the lower magnetic pure iron 11 . The lower magnetic pure iron 11 and the movable contact 3 are connected and fixed by interference fit between the bosses 12 and the fixing holes.

[0027] After the moving contact and the static contact are in contact and energized, the circuit of the moving contact generates a magnetic field, causing the upper magnetic pure iron and the lower magnetic pure iron to produce magnetic force and attract each other. The upper magnetic pure iron is fixed to the top of the upper push rod. Due to the suction force of the upper and lower magnetic pure iron, the lower magnetic pure iron further presses the moving contact toward the static contact, ensuring a stable connection between the moving contact and the static contact, and improving stability to prevent short circuits.

[0028] The specific embodiments described herein are merely examples of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-voltage relay structure capable of resisting short-circuit and high current, comprising a housing, wherein a static contact and a moving contact are arranged in the housing, characterized in that: The moving contact is installed on the push rod, an upper magnetic pure iron is provided above the moving contact, and a lower magnetic pure iron is provided below the moving contact. The upper magnetic pure iron is fixed on the push rod, and the lower magnetic pure iron is fixed on the moving contact. When the moving contact is energized, a magnetic field is formed, and the upper magnetic pure iron and the lower magnetic pure iron generate magnetic force and tend to attract each other.

2. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 1, characterized in that: The materials of the upper magnetic pure iron and the lower magnetic pure iron are both electrical pure iron.

3. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 1 or 2, characterized in that: A through hole is arranged at the center of the upper magnetic pure iron, the push rod is a stepped shaft, and the upper magnetic pure iron is fixed on the push rod through a locking nut.

4. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 1 or 2, characterized in that: The cross section of the upper magnetic pure iron is U-shaped, and the moving contact is located in the U-shaped groove of the upper magnetic pure iron.

5. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 1 or 2, characterized in that: The lower magnetic pure iron is provided with a fixing hole, and the movable contact is provided with a boss, which is interference-fitted with the fixing hole of the lower magnetic pure iron.

6. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 1 or 2, characterized in that: The moving contact is connected to the push rod through a spring, and the push rod includes an upper push rod and a lower push rod, which are connected through an insulating member, one end of the upper push rod passes through a through hole on the moving contact, and the spring is installed on the upper push rod, one end of the spring abuts against the moving contact, and the other end of the spring abuts against the upper end surface of the insulating member; the lower push rod is located in the through hole of the magnetic circuit system structure below the shell.

7. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 6, characterized in that: The upper end surface of the insulating member is provided with an upper connecting groove fixedly connected to the upper push rod, the end of the upper push rod is provided with an upper protrusion structure matching with the upper connecting groove, the upper end surface of the insulating member is provided with a lower connecting groove fixedly connected to the upper push rod, and the end of the lower push rod is provided with a lower protrusion structure matching with the lower connecting groove.

8. A high-voltage relay structure capable of resisting short-circuit and high current according to claim 6, characterized in that: The upper push rod and the lower push rod are made of stainless steel, and the insulating member is a plastic insulating member.

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