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

Abstract

The utility model relates to a relay structure. An anti-short-circuit large-current high-voltage relay comprises a bottom plate, a housing installed on the bottom plate, a static contact piece installed on the housing, a push rod structure and a movable contact piece installed in the housing, a support arranged in the housing, a first upper armature installed on the support and located above the movable contact piece, a lower armature installed on the push rod structure, and a second upper armature installed on the lower armature and located above the movable contact piece. The lower armature is located below the movable contact piece, a second upper armature is arranged above the movable contact piece, the movement stroke of the lower armature moving upwards under the action of the push rod is a first stroke, the movement stroke of the second upper armature moving upwards under the action of the push rod is a second stroke, and the second stroke is larger than the first stroke. The high-voltage relay structure resistant to short circuit and large current is simple in structure, good in reliability, and capable of effectively preventing short circuit and improving the stability of the relay. The technical problems that in the prior art, a high-voltage relay cannot meet the requirement for passing of large current, and performance is not stable are solved.

Description

Technical Field

[0001] This utility model relates to a relay structure, and more particularly to a high-voltage relay that is resistant to short-circuit high current. Background Technology

[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), and is commonly 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 a specified requirement.

[0003] Relays are common 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 equipment such as new energy vehicles, charging piles, and power electronic energy storage stations. Especially in the field of high-voltage circuit control, relays undertake important execution tasks. Through the isolated operation of the working coil, they can realize the opening and closing actions of high-voltage circuits. Their working performance is related to the safe use of high-voltage circuits, so they need to have good current breaking capacity and overload performance.

[0004] Modern high-voltage relays typically consist of a housing containing a push rod, a moving contact, and a stationary contact. The contact and disconnection of the moving and stationary contacts ensure the relay's continuity. Modern relays generally allow a current of around 300A, but in special applications, currents can sometimes reach around 8000A. Relays with high current requirements are prone to short circuits. Summary of the Invention

[0005] This utility model provides a high-voltage relay structure that is simple in structure, reliable, effectively prevents short circuits, and improves relay stability, thus resisting high current short circuits. It solves the technical problem that existing high-voltage relays cannot meet the requirements for large current passage and have unstable performance.

[0006] The above-mentioned technical problem of this utility model is solved by the following technical solution: a high-voltage relay resistant to short-circuit high current includes a base plate, a cover is installed on the base plate, a stationary contact is installed on the cover, a push rod structure and a moving contact are installed inside the cover, the push rod structure drives the moving contact to move axially, a bracket is provided inside the cover, a first upper armature is installed on the bracket, the first upper armature is located above the moving contact, a lower armature is installed on the push rod structure, the lower armature is located below the moving contact, a second upper armature is provided above the moving contact, the lower armature moves upward under the action of the push rod for a first stroke, the second upper armature moves upward under the action of the push rod for a second stroke, and the second stroke is greater than the first stroke. Below the push rod are a moving iron core and a stationary iron core. Electromagnetic force drives the push rod to move axially upwards. The push rod drives the moving contact and the second upper armature to move upwards synchronously. When the moving contact contacts the stationary contact, it stops moving upwards due to contact. The lower armature, located below the moving contact, also stops moving due to the obstruction of the moving contact. The push rod then drives the second upper armature to continue moving upwards, increasing the distance between the second upper armature and the lower armature. When a large current flows through the moving and stationary contacts, the current in the moving contact increases, generating a magnetic field. This creates an electromagnetic attraction between the upper and lower armatures. The second upper armature, fixed to the push rod, provides a large compensation force for short circuits, but it also creates an upward reaction force on the push rod components. Therefore, fixing the first upper armature to the bracket increases the compensation force required for short circuit resistance and avoids the electromagnetic reaction force affecting the electromagnetic mechanism, thus enhancing the engagement stability of the moving and stationary contacts. The simultaneous action of the two upper armatures increases the magnetic field area for short-circuit protection, further enhancing the electric compensation force. At the same time, by fixing a first upper armature at the bracket instead of the push rod, the impact of electromagnetic reaction force on the electromagnetic mechanism is greatly reduced. The bracket is an insulated bracket, and the installation of the first upper armature on the bracket provides a more stable relay structure.

[0007] Preferably, the lower armature is U-shaped, and the inner walls of the two vertically arranged plates of the lower armature are provided with stepped surfaces, which are located below the second upper armature. This ensures that the air gaps formed by the first and second upper armatures and the lower armature are approximately the same, thereby generating a greater compensating force.

[0008] Preferably, the push rod is fitted with a second upper armature and a moving contact piece. The upper section of the push rod is a stepped shaft, and the end face of the second upper armature abuts against the shoulder of the stepped shaft. After the stepped push rod causes the moving contact piece to contact the stationary contact, the moving contact piece stops moving upwards, while the push rod can drive the second upper armature to continue moving upwards, causing the second upper armature and the lower armature to separate. Subsequently, they can tend to attract each other, thereby providing a compensating force.

[0009] Preferably, the bracket includes a frame-shaped base, on which a U-shaped frame is formed, and a first upper armature is fixed to the crossbeam of the frame by rivets. The fixing structure is simple, has good stability, and the first upper armature does not affect the movement of the push rod component.

[0010] Preferably, the second upper armature is located within the "U"-shaped space formed by the lower armature. Through the interaction of the stepped surfaces, two approximately identical air gaps are formed. The first and second upper armatures work together to increase the magnetic conductive area for short-circuit protection and improve the compensation force.

[0011] Preferably, the end faces of the two vertically arranged plates of the "U"-shaped lower armature are higher than the moving contact, and the length of the upper armature is not less than the length of the horizontally arranged plates of the "U"-shaped lower armature. The upper and lower armatures are arranged correspondingly, with the lower armature avoiding the middle moving contact portion, and the upper end face of the vertical portion making as much contact as possible with the upper armature to ensure connection stability.

[0012] Preferably, the air gap between the first upper armature and the lower armature is 'a', and the air gap between the second upper armature and the lower armature is 'b', where a = b. Since a and b are approximately the same, the compensation forces of the first and second upper armatures are approximately the same, thereby improving the overall compensation force.

[0013] Preferably, the first upper armature is riveted to the cover wall by a bracket, and the second upper armature is fixed to the push rod by riveting to the washer.

[0014] Preferably, the bracket comprises a metal frame covered with a plastic layer, and the frame is fixed to the base plate by screws.

[0015] Therefore, the high-voltage relay with short-circuit high current resistance of this utility model has the following advantages:

[0016] 1. The design of two upper armatures increases the magnetic field area for short-circuit protection and further improves the electric compensation force. In addition, one of the upper armatures is not fixed to the push rod, which can maintain the stability of the electromagnetic structure engagement while increasing the short-circuit protection effect.

[0017] 2. This structure effectively improves the relay's ability to withstand instantaneous electromagnetic repulsion caused by short-circuit current, which could lead to the moving contact springing away from the main contact, thus enhancing the relay's contact stability when carrying large currents.

[0018] 3. By designing a stepped lower armature, the compensation force required to withstand short circuits can be increased, and the electromagnetic reaction force can be prevented from affecting the electromagnetic mechanism, thereby enhancing the engagement stability of the electromagnetic part.

[0019] 4. Simple structure and good cost control. Attached Figure Description

[0020] Figure 1 This is a three-dimensional diagram of a high-voltage relay structure that can withstand large short-circuit currents.

[0021] Figure 2 yes Figure 1 A sectional view.

[0022] Figure 3 yes Figure 1 A three-dimensional view of the removed cover and stationary contact parts.

[0023] Figure 4 yes Figure 1 A three-dimensional diagram of the lower armature.

[0024] Figure 5 This is a schematic diagram of Example 2. Detailed Implementation

[0025] The technical solution of the utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0026] Example 1:

[0027] like Figure 1 and 2 As shown in Figure 3, a high-voltage relay resistant to short-circuit high current includes a base plate 1, and a cuboid housing 2 is mounted on top of the base plate 1. Two cylindrical stationary contacts 3 are mounted on the upper end of the housing 2.

[0028] A plastic support 4 is arranged inside the housing 2. The support 4 includes a rectangular frame-shaped base 13, on which a U-shaped frame 12 is formed. The frame-shaped base 13 has the same cross-section as the housing 2. The U-shaped frame 12 is connected to the inner wall of the housing 2. The support 4 restricts its degree of freedom through the housing 2. A first upper armature 5 is installed on the crossbeam of the U-shaped frame 12 by rivets.

[0029] A push rod structure and a movable contact plate 7 are also installed inside the housing 2. The push rod structure includes a movable iron core 10 located below the base plate, and a push rod 9 is installed inside the movable iron core 10. A contact spring 8, a lower armature 6, a movable contact plate 7, and a second upper armature 11 are sleeved on the push rod 9. The part of the push rod that sleeves the movable contact plate 7 and the second upper armature 11 is a stepped shaft, and the second upper armature abuts against the shoulder 18 of the stepped shaft. The upper part of the second upper armature is fixed to the push rod by a washer 19 through riveting.

[0030] like Figure 4As shown, the lower armature 6 is U-shaped, and the two vertically arranged plates 14 of the U-shaped lower armature are parallel to the inner wall of the U-shaped frame 12 of the support. When the lower armature moves, it does not interfere with the support frame. A through hole 16 for the push rod to pass through is opened in the center of the horizontally arranged plate 15 of the lower armature, and the lower armature 6 is fixed to the moving contact plate 7 by bolts. One end of the contact spring 8 abuts against the lower armature 6. The two vertically arranged plates 14 of the U-shaped lower armature 6 have stepped surfaces, and the second upper armature abuts against the stepped surface 17. The upper surfaces of the two vertically arranged plates 15 are higher than the moving contact plate 7, and the second upper armature 11 is located within the space of the U-shaped lower armature. The air gap a between the first upper armature 5 and the lower armature 6 is approximately the same as the air gap b between the second upper armature 11 and the lower armature 6. This improves the compensation force.

[0031] Example 2:

[0032] like Figure 5 As shown, unlike Embodiment 1, the bracket 4 is a metal "U"-shaped frame covered with an insulating plastic layer, which effectively isolates high and low voltage while providing insulation. The open end of the frame is connected to the base plate, and a flange 20 is provided at the lower front end of the frame, which is positioned by bolts.

[0033] The specific embodiments described herein are merely illustrative of the concept of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A high-voltage relay resistant to short-circuit high current, comprising a base plate, a housing mounted on the base plate, a stationary contact mounted on the housing, and a push rod structure and a moving contact plate installed inside the housing, the push rod structure driving the moving contact plate to move axially, characterized in that: The housing is equipped with a bracket, on which a first upper armature is mounted. The first upper armature is located above the moving contact piece. A lower armature is mounted on the push rod structure and is located below the moving contact piece. A second upper armature is located above the moving contact piece. The lower armature moves upward under the action of the push rod for a first stroke, and the second upper armature moves upward under the action of the push rod for a second stroke. The second stroke is greater than the first stroke.

2. The high-voltage relay with high short-circuit current protection according to claim 1, characterized in that: The lower armature is U-shaped, and the inner walls of the two vertically arranged plates of the lower armature are provided with stepped surfaces, which are located below the second upper armature.

3. The high-voltage relay with high short-circuit current resistance according to claim 1, characterized in that: The push rod is fitted with a second upper armature and a movable contact piece. The upper section of the push rod is a stepped shaft, and the end face of the second upper armature abuts against the shoulder of the stepped shaft.

4. The high-voltage relay with high short-circuit current protection according to claim 1, 2, or 3, characterized in that: The bracket includes a frame-shaped base, on which a U-shaped frame is formed, and a first upper armature is fixed to the crossbeam of the frame by rivets.

5. The high-voltage relay with high short-circuit current protection according to claim 1, 2, or 3, characterized in that: The second upper armature is located within the "U"-shaped space formed by the lower armature.

6. The high-voltage relay with high short-circuit current protection according to claim 1, 2, or 3, characterized in that: The end faces of the two vertically arranged plates of the "U"-shaped lower armature are higher than the moving contact plate, and the length of the first upper armature is not less than the length of the horizontally arranged plates of the "U"-shaped lower armature.

7. The high-voltage relay with high short-circuit current protection according to claim 1, 2, or 3, characterized in that: The air gap between the first upper armature and the lower armature is a, and the air gap between the second upper armature and the lower armature is b, where a = b.

8. The high-voltage relay with high short-circuit current protection according to claim 1, 2, or 3, characterized in that: The first upper armature is riveted to the cover wall by a bracket, and the second upper armature is fixed to the push rod by riveting to the washer.

9. The high-voltage relay with short-circuit high current protection according to claim 1, 2, or 3, characterized in that: The bracket comprises a metal frame covered with a plastic layer, and the frame is fixed to the base plate by screws.

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