10kV vacuum circuit breaker

Abstract

The utility model discloses a 10kV vacuum circuit breaker, which comprises an operating mechanism, a main shaft, a pull plate, an insulating pull rod, an arc extinguish chamber and a buffer mechanism, a moving contact and a static contact are arranged in the arc extinguish chamber; one end of the insulating pull rod is connected with the moving contact, and the other end is connected with the main shaft through a pull plate; the operating mechanism is connected with the main shaft and provides driving force for the main shaft. And a buffer mechanism is arranged at one end of the main shaft. The buffer mechanism is arranged to absorb kinetic energy during opening and closing, and the contact is prevented from swinging back and forth.

Description

Technical Field

[0001] The utility model relates to a circuit breaker, in particular to a 10kV vacuum circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague, and those above 3kV are generally called high-voltage electrical appliances.

[0003] 10kV circuit breakers need to meet the requirements of opening time of 20~45ms and closing time of less than 60ms, so the operating mechanism requires a very large force, and a spring energy storage operating mechanism is generally used. Due to the large kinetic energy, there will be a jump when opening and closing, which will lead to incomplete opening and closing. In order to eliminate this hidden danger, this application has optimized and improved the transmission part. Summary of the invention

[0004] The problem to be solved by the utility model is to propose an improvement or replacement scheme for the above-mentioned shortcomings of the prior art, especially an improvement or replacement scheme for eliminating contact bounce during opening and closing of the switch.

[0005] In order to solve the above problems, the solution adopted by the utility model is as follows: a 10kV vacuum circuit breaker, characterized in that it includes an operating mechanism, a main shaft, a pull plate, an insulating pull rod, an arc extinguishing chamber and a buffer mechanism; a moving contact and a static contact are arranged in the arc extinguishing chamber; one end of the insulating pull rod is connected to the moving contact, and the other end is connected to the main shaft through the pull plate; the operating mechanism is connected to the main shaft to provide driving force for the main shaft; a buffer mechanism is arranged at one end of the main shaft; the buffer mechanism includes a buffer chamber and a backstop assembly; a partition is arranged in the buffer chamber to separate a slide groove and a U-shaped oil groove in the buffer chamber, and the slide groove is connected to the U-shaped oil groove; the main shaft is inserted into the slide groove, and the U-shaped oil groove is filled with pressure oil; a backstop assembly is arranged in a chamber on one side of the U-shaped oil groove, and the gap between the backstop assembly and the chamber is less than 0.5mm, and a matching notch is arranged on the main shaft. The gap between the backstop assembly and the chamber is preferably 0.2 mm, which ensures that the backstop assembly can rise and fit into the groove under the push of the pressure oil, and provides a channel for the pressure oil to return. The channel should be neither too large nor too small.

[0006] Furthermore, the 10kV vacuum circuit breaker is characterized in that the insulating pull rod includes a contact connector, an insulator, a pull rod, a spring seat, a spring, a sleeve, and a pull plate connector; the insulator and the pull rod constitute a composite insulating pull rod, one insulating end of the composite insulating pull rod is connected to the moving contact through the contact connector, and the other end is sleeved with a spring seat and a spring, and is limited by a sleeve; a waist-shaped hole is provided on the composite insulating pull rod, and the sleeve is connected to the composite insulating pull rod through a bayonet and the waist-shaped hole; the sleeve is connected to the pull plate through a pull plate connector.

[0007] Furthermore, the 10kV vacuum circuit breaker is characterized in that the retaining assembly is a steel ball, the notch on the main shaft is an arc-shaped notch matching the steel ball, and the depth of the arc-shaped notch is smaller than the radius of the steel ball.

[0008] Furthermore, the 10kV vacuum circuit breaker is characterized in that the lower part of the anti-retraction assembly is a columnar structure, and the upper part is a hemispherical structure.

[0009] Furthermore, the 10kV vacuum circuit breaker is characterized in that the filling level of the pressure oil in the U-shaped oil tank cannot exceed the overall height of the anti-retraction component, and a space is left on the upper part of the anti-retraction component for the anti-retraction component to move up and down.

[0010] The technical effects of the utility model are as follows: the vibration generated when the gate is opened is eliminated by setting a buffer mechanism, and the possibility of the main shaft rebounding is completely eliminated. When the gate is opened, the rebound amplitude of the main shaft is the largest for the first two times, and the danger is also the greatest. The backstop component can just prevent the rebound of the first two times by 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of a 10kV vacuum circuit breaker.

[0012] Figure 2 Schematic diagram of the insulating pull rod when closing the circuit breaker.

[0013] Figure 3 Schematic diagram of the insulating pull rod when opening the switch.

[0014] Figure 4 It is a buffer mechanism when closing the circuit breaker.

[0015] Figure 5 It is a buffer mechanism when opening the gate.

[0016] Among them, 1 is a buffer mechanism, 11 is a buffer chamber, 12 is a partition, 13 is a U-shaped oil groove, 14 is a backstop assembly, 2 is a main shaft, 21 is a notch, 3 is an insulating pull rod, 31 is a contact connector, 32 is an insulator, 33 is a pull rod, 34 is a spring, 35 is a spring seat, 36 is a sleeve, 37 is a pull plate connector, 4 is an arc extinguishing chamber, and 5 is an operating mechanism. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0018] Example: Figure 1 As shown, a 10kV vacuum circuit breaker includes an operating mechanism, a main shaft, a pull plate, an insulating pull rod, an arc extinguishing chamber and a buffer mechanism; a moving contact and a static contact are arranged in the arc extinguishing chamber; one end of the insulating pull rod is connected to the moving contact, and the other end is connected to the main shaft through the pull plate; the operating mechanism is connected to the main shaft to provide driving force for the main shaft; a buffer mechanism is arranged at one end of the main shaft; the buffer mechanism includes a buffer chamber and a stop assembly; a partition is arranged in the buffer chamber to separate a slide groove and a U-shaped oil groove in the buffer chamber, and the slide groove is connected to the U-shaped oil groove; the main shaft is inserted into the slide groove, and the U-shaped oil groove is filled with pressure oil; a stop assembly is arranged in a chamber on one side of the U-shaped oil groove, and the gap between the stop assembly and the chamber is less than 0.5mm, and a matching notch is arranged on the main shaft. The gap between the stop assembly and the chamber is preferably 0.2mm, which not only ensures that the stop assembly can rise and fit into the notch under the push of the pressure oil, but also provides a channel for the pressure oil to flow back, and the channel should not be too large or too small. The notch on the spindle is an arc-shaped notch that matches the spindle, and the depth of the arc-shaped notch is less than the radius of the steel ball. The lower part of the anti-recoil component is a cylindrical structure, and the upper part is a hemispherical structure. The filling level of the pressure oil in the U-shaped oil groove cannot exceed the overall height of the anti-recoil component. Space is left on the upper part of the anti-recoil component for the anti-recoil component to move up and down.

[0019] like Figure 3 and 4 As shown, the insulating pull rod includes a contact connector, an insulator, a pull rod, a spring seat, a spring, a sleeve, and a pull plate connector; the insulator and the pull rod constitute a composite insulating pull rod, one insulating end of the composite insulating pull rod is connected to the moving contact through the contact connector, and the other end is sleeved with a spring seat and a spring, and is limited by a sleeve; a waist-shaped hole is provided on the composite insulating pull rod, and the sleeve is connected to the composite insulating pull rod through a bayonet and the waist-shaped hole; the sleeve is connected to the pull plate through a pull plate connector.

[0020] like Figure 5 As shown in the figure, when the gate is opened, the main shaft moves into the slide groove, compresses the air, and transmits the pressure to the pressure oil on one side of the U-shaped oil groove. The pressure oil on the other side pushes the backstop assembly to rise quickly and get stuck in the notch on the main shaft, which restricts the main shaft and thus eliminates the vibration when the gate is opened. Then the backstop assembly falls back under the action of its own gravity.

[0021] like Figure 4As shown in the figure, when closing the switch, the main shaft pushes the composite insulating rod through the pull plate to close the moving contact and the static contact. In this process, the composite insulating rod and the spring move at the same time. When the moving contact contacts the static contact, the composite insulating rod remains in the same position and the spring is compressed. The spring absorbs kinetic energy, completely eliminating the vibration generated during closing and ensuring the stability of closing. When closing is completed, the pressure between the moving contact and the static contact comes entirely from the spring, which provides a pressure of 2000±200N.

Claims

1. A 10kV vacuum circuit breaker, characterized in that: It includes an operating mechanism, a main shaft, a pull plate, an insulating pull rod, an arc extinguishing chamber and a buffer mechanism; a moving contact and a static contact are arranged in the arc extinguishing chamber; one end of the insulating pull rod is connected to the moving contact, and the other end is connected to the main shaft through the pull plate; the operating mechanism is connected to the main shaft to provide driving force for the main shaft; a buffer mechanism is arranged at one end of the main shaft; the buffer mechanism includes a buffer chamber and a backstop assembly; a partition is arranged in the buffer chamber to separate a slide groove and a U-shaped oil groove into the buffer chamber, and the slide groove is connected to the U-shaped oil groove; the main shaft is inserted into the slide groove, and the U-shaped oil groove is filled with pressure oil; a backstop assembly is arranged in a chamber on one side of the U-shaped oil groove, and the gap between the backstop assembly and the chamber is less than 0.5mm, and a matching notch is arranged on the main shaft.

2. The 10kV vacuum circuit breaker according to claim 1, characterized in that: The insulating pull rod includes a contact connector, an insulator, a pull rod, a spring seat, a spring, a sleeve, and a pull plate connector; the insulator and the pull rod form a composite insulating pull rod, one insulating end of the composite insulating pull rod is connected to the moving contact through the contact connector, and the other end is sleeved with a spring seat and a spring, and is limited by a sleeve; a waist-shaped hole is provided on the composite insulating pull rod, and the sleeve is connected to the composite insulating pull rod through a bayonet and the waist-shaped hole; the sleeve is connected to the pull plate through a pull plate connector.

3. The 10kV vacuum circuit breaker according to claim 1, characterized in that: The backstop assembly is a steel ball, the notch on the main shaft is an arc-shaped notch matching the steel ball, and the depth of the arc-shaped notch is smaller than the radius of the steel ball.

4. The 10kV vacuum circuit breaker according to claim 1, characterized in that: The lower part of the anti-retraction component is a columnar structure, and the upper part is a hemispherical structure.

5. The 10kV vacuum circuit breaker according to claim 1, characterized in that: The filling level of the pressure oil in the U-shaped oil groove cannot exceed the overall height of the backstop assembly.

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