CN202549751U

CN202549751U - Oil buffer of circuit breaker

Info

Publication number: CN202549751U
Application number: CN2012200973337U
Authority: CN
Inventors: 万方华; 徐少波; ***; 王通德; 赵晔; 姜启湘
Original assignee: WUXI HENGCHI ELECTRIC APPARATUS MANUFACTURING Co Ltd
Current assignee: WUXI HENGCHI ELECTRIC APPARATUS MANUFACTURING Co Ltd
Priority date: 2012-03-15
Filing date: 2012-03-15
Publication date: 2012-11-21
Anticipated expiration: 2022-03-15

Abstract

The utility model relates to an oil buffer of a circuit breaker. The oil buffer of the circuit breaker comprises a cylinder body, a piston and pushrod. The piston pushes the pushrod to move back and forth in the cylinder body. Oil drain holes are arranged in the side wall of the cylinder body and are spirally distributed along the moving direction of the piston. The diameters of the oil drain holes are gradually decreased from the bottom to the top of the cylinder body. The oil buffer of the circuit breaker provided by the utility model has the advantages that the effect of gently releasing pressure can be realized and the buffering effect is good.

Description

The oil bumper of circuit breaker

[technical field]

The utility model is about the primary cut-out field, particularly about the improvement of the oil bumper in the primary cut-out.

[background technology]

In electric power system, circuit breaker is a very important link, particularly primary cut-out, its when separating brake, the impulse force in the time of usually all can adopting buffer to cushion separating brake.A kind of buffer of existing primary cut-out is an oil bumper, in the cylinder body of circuit breaker, is full of oil at that time, and piston outward during separating brake will be by discharging in cylinder body, and the resistance when utilizing oil to discharge comes the impulse force of damper piston motion.Buffer requires when separating brake, and the time that piston moves in cylinder body also is that the time of the release of pressure must be grasped, and reaches mild release.As shown in Figure 1; The process that existing oil bumper possible pressure discharges is not mild, for example among Fig. 1 shown in the curve A, the pressure of possible piston in a short period of time just release finish; The speed of pressure release is very fast like this; Perhaps shown in curve B among the figure, the time that piston pressure discharges is very long, and the time that crossed does not also discharge and finishes.In addition, its draining hole of existing buffer is a parallel arrangement, and the time that possible pressure discharges also can reach requirement, but the process that pressure discharges is rough, and shown in curve C among Fig. 1, being reflected on the pressure time curve is the curve that step is arranged.

Therefore, be necessary existing oil bumper is improved, to overcome the defective of prior art.

[utility model content]

The purpose of the utility model is to provide a kind of oil bumper of circuit breaker, and its impulse force buffering can reach time requirement and buffering is mild.

For reaching aforementioned purpose; The oil bumper of a kind of circuit breaker of the utility model; It comprises cylinder body, piston and push rod, and push rod and piston promote reciprocating motion each other in cylinder body, on the sidewall of cylinder body, offer the draining hole; Said draining hole is in spiral distribution along the piston direction of motion, and the diameter in said draining hole reduces to the top from the bottom of cylinder body gradually.

Further, said oil bumper also comprises the shoe cream room that is enclosed in the cylinder body outside, and the oil in the cylinder body is expelled to shoe cream room from the draining hole, returns cylinder body by shoe cream room through the draining orifice flow again.

Compared with prior art; The oil bumper of the utility model, because the draining hole is in spiral distribution along the piston direction of motion, and the diameter in said draining hole reduces to the top from the bottom of cylinder body gradually; Piston oil in motion process is mild the discharge, so pressure can discharge gently.

[description of drawings]

Pressure-time diagram when Fig. 1 is existing oil bumper separating brake;

Fig. 2 is the structural representation of the oil bumper of the utility model;

Fig. 3 is the distribution schematic diagram in draining hole of the oil bumper of the utility model.

[embodiment]

Alleged here " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment.

As shown in Figure 2; It shows the cutaway view of the oil bumper that is used for circuit breaker of the utility model; As shown in Figure 2, it comprises the oil bumper of the utility model cylinder body 1, is positioned at the piston 3 of cylinder body and the push rod 2 that links with piston 3, is formed with the shoe cream room 4 of cavity in the outside of cylinder body 1.Sidewall 11 at cylinder body 1 is formed with some drainings hole 5; As shown in Figure 3; Draining hole 5 on the cylinder side wall (just piston outwards moves and discharges the direction of the oil in the cylinder body) from bottom to top is in spiral distribution; And the draining bore dia of bottommost is maximum, and the diameter to draining hole, top reduces gradually.

When work, when breaker closing, piston 3 is arranged in the bottom (being the rightmost side of Fig. 2) of cylinder body 1, is full of oil in the cylinder body 1 of circuit breaker at this moment.When circuit breaker was opened a sluice gate, piston 3 outwards moved (promptly move to the left in the right side from Fig. 2), and the oil that piston 3 promotes in the cylinder body is discharged cylinder body through draining hole 5, gets into shoe cream room 4.Because the direction of motion that oil is discharged along piston in draining hole 5 is that spiral distributes, and compares with all parallel distribution in all draining holes, can discharge more swimmingly when discharging oil.And since the direction of motion that the diameter in draining hole 5 is discharged oil along piston 3 reduce gradually, so piston 3 outward more, draining hole 5 is more little, the speed that oil is discharged is slow more, so resistance is big more, realizes mild oil extraction.After oil is discharged in cylinder body 1, get into shoe cream room 4, after the piston motion, oil gets into cylinder bodies 1 from piston 3 draining hole 5 at the back again in shoe cream room 4.When closing a floodgate once more, piston 3 is inwardly motion under the promotion of push rod 2, realizes and open a sluice gate opposite process.

Above-mentioned explanation has fully disclosed the embodiment of the utility model.It is pointed out that any change that the technical staff that is familiar with this field does the embodiment of the utility model does not all break away from the scope of claims of the utility model.Correspondingly, the scope of the claim of the utility model also is not limited only to previous embodiment.

Claims

1. the oil bumper of a circuit breaker; It comprises cylinder body, piston and push rod; Push rod and piston promote reciprocating motion each other in cylinder body; On the sidewall of cylinder body, offer the draining hole, it is characterized in that: said draining hole is in spiral distribution along the piston direction of motion, and the diameter in said draining hole reduces to the top from the bottom of cylinder body gradually.

2. oil bumper as claimed in claim 1 is characterized in that: said oil bumper also comprises the shoe cream room that is enclosed in the cylinder body outside, and the oil in the cylinder body is expelled to shoe cream room from the draining hole, returns cylinder body by shoe cream room through the draining orifice flow again.