Double-opening buffer structure for vacuum circuit breaker

Abstract

The utility model relates to the field of high-voltage circuit breaker structures, in particular to a double-opening buffer structure for a vacuum circuit breaker, which comprises an interphase connecting rod, a first buffer and a second buffer. The second buffer is an oil buffer with an adjustable buffer force value, the buffer stroke of the second buffer can be adjusted by adjusting the intervention position of the second buffer, and the opening speed in the buffer range can be adjusted by adjusting the buffer force value of the second buffer. According to the utility model, at the end of opening, the first buffer and the second buffer in the mechanism act at the same time, and excessive energy during opening can be absorbed, so that the opening rebound value can be reduced to zero, and the problem of opening rebound is avoided.

Description

Technical Field

[0001] The utility model relates to the field of high-voltage circuit breaker structures, in particular to a double-opening buffer structure for a vacuum circuit breaker. Background Art

[0002] When developing a vacuum circuit breaker, its breaking current performance is related to the mechanical characteristics of the opening. It is necessary to match the opening speed value under different contact opening distances according to the breaking characteristics of the vacuum interrupter to give full play to the breaking current capacity of the vacuum interrupter.

[0003] When the circuit breaker is in the open position, due to the large opening energy, when the mechanism hits the opening limit, although the mechanism is designed with an opening buffer, it is still easy to rebound. The industry currently requires that the opening rebound value should be ≤2mm, and the design of the mechanism buffer is very difficult.

[0004] In the case of a single buffer, the opening speed value is difficult to match and the opening rebound value is difficult to control. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a double-opening buffer structure for a vacuum circuit breaker, so as to solve the problems that the opening mechanical characteristics of the vacuum circuit breaker are difficult to match and the opening rebound value of the vacuum circuit breaker is difficult to control.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a double-opening buffer structure for a vacuum circuit breaker, the innovation of which is:

[0007] An interphase connecting rod, wherein the interphase connecting rod is arranged horizontally, a mechanism output connecting rod is arranged in the middle of the interphase connecting rod, and a roller is installed at one end of the interphase connecting rod;

[0008] A first buffer, the first buffer is connected to the mechanism output connecting rod through a mechanism crank arm;

[0009] The second buffer is horizontally arranged on one side of the interphase connecting rod, and the input end of the second buffer is arranged toward the roller.

[0010] Furthermore, the second buffer can be movably mounted on a buffer bracket, and the distance between the second buffer input end and the roller is the buffer stroke. The position of the second buffer intervention can be adjusted according to actual needs, thereby realizing the adjustment of the second buffer buffer stroke.

[0011] Furthermore, the second buffer is an oil buffer with an adjustable buffer force value, and the opening buffer force value can be adjusted according to the opening characteristics of different vacuum circuit breakers.

[0012] The advantages of the utility model are:

[0013] (1) The double buffer structure designed in the utility model adds a second buffer at the end of the phase-to-phase connecting rod. The second buffer is an oil buffer with an adjustable buffer force value. The buffer stroke of the second buffer can be adjusted by adjusting the intervention position of the second buffer. The opening speed within the buffer range can be adjusted by adjusting the buffer force value of the second buffer itself, thereby efficiently and quickly matching the opening mechanical characteristics required by the vacuum interrupter.

[0014] (2) At the end of the opening of the gate, the first buffer and the second buffer in the mechanism of the utility model act simultaneously to absorb the excess energy during the opening of the gate, thereby reducing the opening rebound value to zero, thus avoiding the problem of opening rebound.

[0015] (3) The utility model has a simple structure, is stable and reliable, has an ingenious structural design, saves costs, and has a high cost-effectiveness ratio. It can be applied to the design of a transmission system for a high-voltage vacuum circuit breaker and the opening speed matching of a vacuum interrupter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Figure 1 This is a structural diagram of the vacuum circuit breaker of the present utility model.

[0018] Figure 2 Part of the structure of the utility model Figure 1 .

[0019] Figure 3 Part of the structure of the utility model Figure 2 . Implementation

[0020] When the existing vacuum circuit breaker is opened, the opening spring drives the output crank arm to move. At the end of the opening stroke, the opening buffer inside the mechanism intervenes to buffer the opening. The buffer force value is large and cannot be adjusted after the buffer design. If the requirements are not met, the buffer stroke and buffer force value need to be redesigned, and repeated design and debugging are required, which is cost-effective.

[0021] like Figures 1 to 3 A double opening buffer structure for a vacuum circuit breaker is shown, in which a second buffer 6 is added to the end of the phase-to-phase connecting rod 5. The second buffer 6 is an oil buffer with an adjustable buffer force value. The buffer stroke of the second buffer 6 can be adjusted by adjusting the intervention position of the second buffer 6. The opening speed within the buffer range can be adjusted by adjusting the buffer force value of the second buffer 6 itself, thereby efficiently and quickly matching the opening mechanical characteristics required by the vacuum interrupter.

[0022] The vacuum circuit breaker includes a crossbeam 2, a phase column 1, a spring mechanism 3 and a bracket 4. The crossbeam 2 is arranged horizontally, and the bracket 4 is installed on both sides of the bottom end of the crossbeam 2. Three phase columns 1 distributed along the long axis direction of the crossbeam 2 are installed at equal intervals on the top of the crossbeam 2, and there is a cavity in the crossbeam 2.

[0023] The spring mechanism 3 has a mechanism output connecting rod 7 and a mechanism crank arm 8 , and the mechanism output connecting rod 7 is connected to the middle part of the interphase connecting rod 5 .

[0024] The double-opening buffer structure for vacuum circuit breaker comprises an interphase connecting rod 5 , a first buffer 9 and a second buffer 6 .

[0025] The interphase connecting rod 5 is horizontally arranged in the crossbeam 2, and the interphase connecting rod 5 corresponds to the three phase columns 1 one by one. A rectangular groove is opened at one end of the interphase connecting rod 5, and connecting holes are opened on both sides of the rectangular groove on the interphase connecting rod 5. The roller is installed on the interphase connecting rod 5 through the rectangular groove and the connecting hole.

[0026] The first buffer 9 is arranged below the spring mechanism 3 , and the first buffer 9 is connected to the mechanism output connecting rod 7 through the mechanism arm 8 .

[0027] The second buffer 6 is horizontally arranged on one side of the inter-phase connecting rod 5 , and the second buffer 6 includes a body and two nuts threadedly connected to the body.

[0028] The buffer bracket 4 is a L-shaped bracket 4, comprising a mounting plate and a connecting plate arranged perpendicularly to each other, and a screw hole for accommodating the second buffer 6 body to pass through the connecting plate is provided.

[0029] The second buffer 6 is movably mounted on the connecting plate through the two nuts, and the output end of the second buffer 6 is set toward the roller. The distance between the output end of the second buffer 6 and the roller is the buffer stroke. The intervention position of the second buffer 6 can be adjusted according to actual needs, thereby realizing the adjustment of the buffer stroke of the second buffer 6.

[0030] The second buffer 6 in this embodiment is an oil buffer with adjustable buffer force value, and the opening buffer force value can be adjusted according to the opening characteristics of different vacuum circuit breakers.

[0031] Working principle of this patent:

[0032] According to actual needs, the buffer stroke of the second buffer 6 is adjusted by adjusting the intervention position of the second buffer 6, and the opening speed within the buffer range is adjusted by adjusting the buffering force value of the second buffer 6 itself. Through the above two methods, the opening speed value of the vacuum interrupter at different opening distances of the opening can be efficiently and quickly matched.

[0033] At the end of the opening, the first buffer 9 and the second buffer 6 in the mechanism act simultaneously to absorb the excessive energy during the opening, thereby reducing the opening rebound value to zero and avoiding the opening rebound problem.

[0034] The utility model has the advantages of simple structure, stability and reliability, ingenious structural design, cost saving and high cost performance, and can be applied to the transmission system design of high-voltage vacuum circuit breakers and the opening speed matching of vacuum interrupter chambers.

[0035] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-opening buffer structure for a vacuum circuit breaker, characterized in that: include An interphase connecting rod, wherein the interphase connecting rod is arranged horizontally, a mechanism output connecting rod is arranged in the middle of the interphase connecting rod, and a roller is installed at one end of the interphase connecting rod; A first buffer, the first buffer is connected to the mechanism output connecting rod through a mechanism crank arm; The second buffer is horizontally arranged on one side of the interphase connecting rod, and the input end of the second buffer is arranged toward the roller.

2. A double-opening buffer structure for a vacuum circuit breaker according to claim 1, characterized in that: The second buffer is movably mounted on a buffer bracket.

3. A double-opening buffer structure for a vacuum circuit breaker according to claim 1, characterized in that: The second buffer is an oil buffer with adjustable buffer force value.

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