Indoor vacuum circuit breaker

Abstract

The invention discloses an indoor vacuum circuit breaker, comprising a chassis frame, a spring operating mechanism and a sealed pole mounted on the chassis frame, wherein the spring operating mechanism comprises a closing spring connected between a hanging spring shaft and a crank arm; the closing spring is connected to the hanging spring shaft and the crank arm respectively through a connecting plate; a one-way damping mechanism is also connected between the two connecting plates; the indoor vacuum circuit breaker of the invention improves and innovates the structure of the closing spring, designs a damping device matched with the closing spring, can play a certain buffering role on the action of the closing spring, reduce the impact on the crank arm, reduce the impact force between the crank arm and other components, avoid damage caused thereby, and extend the service life.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment, and in particular relates to an indoor vacuum circuit breaker. Background Art

[0002] "Vacuum circuit breaker" is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and arc extinguishing without maintenance, and is widely used in distribution networks. Vacuum circuit breaker is an indoor power distribution device in 3~10kV, 50Hz three-phase AC system. It can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. It is particularly suitable for use in places that require oil-free, less maintenance and frequent operation. The circuit breaker can be configured in the central cabinet, double-layer cabinet and fixed cabinet to control and protect high-voltage electrical equipment.

[0003] At present, the spring operating mechanism of indoor vacuum circuit breakers is equipped with a closing spring (usually a tension spring, which is stretched when storing energy and shortened when releasing energy). The closing spring is connected between the hanging spring shaft and the crank arm, and the crank arm is driven to swing by the closing spring. Since there is no suitable damping device at present, the closing spring generates a great impact force on the crank arm when it is actuated, and drives the crank arm to swing instantly and produce violent collisions with other components, which is easy to be damaged and has a short service life. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides an indoor vacuum circuit breaker, which improves and innovates the structure of the closing spring and designs a damping device that matches the closing spring, which can play a certain buffering role on the action of the closing spring, reduce the impact on the crank arm, reduce the impact force between the crank arm and other components, avoid damage caused thereby, and extend the service life.

[0005] An indoor vacuum circuit breaker of the present invention comprises a chassis frame, a spring operating mechanism and a sealed pole mounted on the chassis frame, wherein the spring operating mechanism comprises a closing spring connected between a spring hanging shaft and a crank arm; the closing spring is connected to the spring hanging shaft and the crank arm respectively through a connecting plate; a one-way damping mechanism is also connected between the two connecting plates, and the one-way damping mechanism can buffer the closing spring when it is released, and does not hinder the reverse action of the closing spring.

[0006] Furthermore, the one-way damping mechanism includes a sleeve and a piston, the sleeve is fixed to one of the connecting plates, the rod of the piston is fixed to the other connecting plate, and the head of the piston is arranged in the sleeve; an air channel is provided at the root of the sleeve, and when the closing spring is shortened and released, the piston is driven to move through the connecting plate, and the air flow rate in the sleeve is limited by the air channel, thereby limiting the movement speed of the piston, thereby playing a damping role on the closing spring.

[0007] Furthermore, the airway is T-shaped, so that the airway has two ports, one of which is blocked by a bolt, and the other port is equipped with a buffer valve. The buffer valve allows external air to enter the sleeve smoothly, while the outflow of air in the sleeve is restricted. Since the buffer valve is installed, the aperture of the airway is based on ensuring smooth flow of gas. Whether to remove the bolts can be selected according to actual needs. After removal, the damping effect disappears, and the closing spring operates in the original working mode.

[0008] Furthermore, the buffer valve includes a valve body, a steel ball and a spring. The steel ball is pressed against the air inlet of the valve body by the spring. The portion of the inner wall of the air inlet end of the valve body that contacts the steel ball is an internal spline structure. Since the portion of the inner wall of the air inlet end of the valve body that contacts the steel ball is an internal spline structure, a plurality of gaps are formed between the steel ball and the valve body for the air in the sleeve to flow out, and at the same time, the gaps limit the air flow rate. When the closing spring acts in the reverse direction, the piston is driven to move in reverse to inhale external air. When air is inhaled, the buffer valve opens under the action of the airflow.

[0009] Furthermore, the spring is a tower spring, which is suitable for installation in a narrow space and helps to reduce the overall size.

[0010] Furthermore, the sleeve and the head of the piston are provided with mutually matching transverse pin holes, and the closing spring, the connecting plate and the one-way damping mechanism are assembled into a module. The transverse pin hole is determined according to the length required for the closing spring when it is installed. Therefore, when assembling the module, a pin can be used to be inserted between the sleeve and the head of the piston to position the closing spring, so that the length of the closing spring is consistent with the installation length, which is conducive to realizing automated assembly, solving the previous dependence on manual labor for spring installation, reducing costs, and pulling out the pin after installation without affecting the operation of the closing spring and the one-way damping mechanism.

[0011] Furthermore, the one-way damping mechanism is arranged inside the closing spring, with a compact structure and reasonable layout.

[0012] The beneficial effects of the present invention are as follows: an indoor vacuum circuit breaker of the present invention has been improved and innovated with respect to the structure of a closing spring, and a damping device matching the closing spring has been designed, which can play a certain buffering role on the action of the closing spring, reduce the impact effect on the crank arm, reduce the impact force between the crank arm and other components, avoid damage caused thereby, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0014] Figure 1is a side view of an indoor vacuum circuit breaker of the present invention;

[0015] Figure 2 It is the structural diagram of the spring operating mechanism;

[0016] Figure 3 for Figure 2 Enlarged view of point A. DETAILED DESCRIPTION

[0017] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0018] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0019] like Figure 1 , 2 As shown in Figure 3: An indoor vacuum circuit breaker of this embodiment includes a chassis frame 01, a spring operating mechanism 02 and a sealed pole 03 installed on the chassis frame 01, wherein the spring operating mechanism includes a closing spring connected between a spring shaft 1 and a crank arm 10; the closing spring is connected to the spring shaft 1 and the crank arm 10 respectively through a connecting plate 2; a one-way damping mechanism is also connected between the two connecting plates 2, and the one-way damping mechanism can buffer the closing spring when it is released, and at the same time does not hinder the reverse action of the closing spring.

[0020] In this embodiment, the one-way damping mechanism includes a sleeve 6 and a piston. The sleeve 6 is fixed to one of the connecting plates 2, the rod 9 of the piston is fixed to the other connecting plate 2, and the head 8 of the piston is arranged in the sleeve 6; an air channel 5 is provided at the root of the sleeve 6. When the closing spring is released, the piston is driven to move through the connecting plate 2, and the air flow rate in the sleeve 6 is limited by the air channel 5, thereby limiting the movement speed of the piston, thereby playing a damping role on the closing spring.

[0021] In this embodiment, the airway 5 is T-shaped, so that the airway 5 has two ports, one of which is blocked by a bolt 3, and the other port is installed with a buffer valve 4. The buffer valve 4 allows external air to smoothly enter the sleeve 6, while the outflow of air in the sleeve 6 is restricted; since the buffer valve 4 is installed, the aperture of the airway 5 is based on satisfying the smooth flow of gas, and whether to remove the bolt 3 can be selected according to actual needs. After removal, the damping effect disappears, and the closing spring operates according to the original working mode.

[0022] In this embodiment, the buffer valve 4 includes a valve body 11, a steel ball 13 and a spring. The steel ball 13 is pressed against the air inlet of the valve body 11 by the spring. The portion of the inner wall of the air inlet end of the valve body 11 that contacts the steel ball 13 is an internal spline structure 12. Since the portion of the inner wall of the air inlet end of the valve body 11 that contacts the steel ball 13 is an internal spline structure 12, a plurality of gaps are formed between the steel ball 13 and the valve body 11 for the air in the sleeve 6 to flow out, and at the same time, the gaps limit the air flow rate. When the closing spring acts in the reverse direction, the piston is driven to move in reverse to inhale external air. When air is inhaled, the buffer valve 4 opens under the action of the airflow.

[0023] In this embodiment, the spring is a tower spring, which is suitable for installation in a narrow space and helps to reduce the overall size.

[0024] In this embodiment, the sleeve 6 and the head 8 of the piston are provided with mutually matching transverse pin holes, and the closing spring, the connecting plate 2 and the one-way damping mechanism are assembled into a module. The transverse pin hole is determined according to the length required for the closing spring when it is installed. Therefore, when assembling the module, a latch 7 can be used to be inserted between the sleeve 6 and the head 8 of the piston to position the closing spring, so that the length of the closing spring is consistent with the installation length, which is conducive to realizing automatic assembly, solving the previous dependence of spring installation on manual labor, and reducing costs. After installation, the latch 7 is pulled out without affecting the operation of the closing spring and the one-way damping mechanism.

[0025] In this embodiment, the one-way damping mechanism is arranged inside the closing spring, with a compact structure and reasonable layout.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. An indoor vacuum circuit breaker, comprising a chassis frame, a spring operating mechanism mounted on the chassis frame and a sealed pole, wherein the spring operating mechanism comprises a closing spring connected between a hanging spring shaft and a crank arm; characterized in that: The closing spring is connected to the spring shaft and the crank arm respectively through a connecting plate; a one-way damping mechanism is also connected between the two connecting plates; the one-way damping mechanism is arranged on the inner side of the closing spring; the one-way damping mechanism includes a sleeve and a piston, the sleeve is fixed to one of the connecting plates, the rod of the piston is fixed to the other connecting plate, and the head of the piston is arranged in the sleeve; an airway is provided at the root of the sleeve; the airway is T-shaped, so that the airway has two ports, one of which is blocked by a bolt, and the other port is installed with a buffer valve.

2. An indoor vacuum circuit breaker according to claim 1, characterized in that: The buffer valve comprises a valve body, a steel ball and a spring. The steel ball is pressed against the air inlet of the valve body by the spring. The part where the inner wall of the air inlet end of the valve body contacts the steel ball is an internal spline structure.

3. An indoor vacuum circuit breaker according to claim 2, characterized in that: The spring is a tower spring.

4. An indoor vacuum circuit breaker according to claim 3, characterized in that: The sleeve and the head of the piston are provided with mutually matching transverse pin holes.

Images