JPS6137165Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pneumatic operating device for a shingle breaker equipped with a buffer mechanism.

In general, there are various means for causing the closing or disconnecting operation of the shield disconnector. One of these means utilizes compressed air pressure and spring force. FIG. 1 is a schematic configuration diagram showing a pneumatic operating device for a vacuum shield disconnector, and FIG. 2 is a sectional view showing a conventional example of the operating device used in FIG. 1. In Fig. 1, 1 is a vacuum interrupter, 2 is a pressure welding mechanism,
3 is an operating device, 4 is a closing/shrinking air switching valve, 5 is
is a compressed air tank. FIG. 2 shows a specific example of the operating device 3, in which 6 is a first cylinder, and a first piston 7 is fitted in the first cylinder 6 in a slidable and airtight manner. . 7
b is a sealing member. 8 is a first piston shaft screwed onto the first piston 7 with a nut 9; 10 is a bow spring disposed outside the first piston shaft 8; and 11 is bored in the upper part of the first cylinder 6. It is a ventilation hole. 12 is the second cylinder;
The cylinder 12 is connected and fixed to the first cylinder 6 by a screw 13. A step 7a for a stopper is formed on the first piston 7, and this step 7a abuts against a step 12a of the second cylinder 12, so that the first piston 7 is stopped. 14 is an input air supply hole bored in the second cylinder 12, 15 is a relatively large-diameter opening communicating with an exhaust hole, which will be described later, and an exhaust valve 16 is disposed in this opening 15. Ru. 17 is a third cylinder, and a second piston 18 is slidably fitted into this third cylinder 17. A second piston shaft 19 is screwed onto the second piston 18 with a nut 20, and the exhaust valve 16 is fixed with a nut 21. 22 is a second piston return spring, and 23 is an exhaust hole. This exhaust hole 23 is communicated with the opening 15 as described above. 24 is an air supply hole. Note that the third cylinder 17 is fixed to the second cylinder 12 with a bolt 25.

In the operating device configured as described above, when the breaker closing command is issued, the switching valve 4 is operated and air is supplied into the second cylinder 12 from the input air supply hole 14. This supplied air causes the first piston 7 to move upward while accumulating force in the armature spring 10, and the vacuum interrupter 1 is closed. Next, when a shrunken command is issued, the switching valve 4 switches,
Air is supplied to the third cylinder 17 from the cooling air supply hole 24 . This air supply causes the second piston 1
8 is slid to the left to open the exhaust hole 16,
The first piston 7 is moved downward by the release of the armature spring 10. When the lower end of the first piston 7 begins to fit into the inner circumferential wall surface 12b of the second cylinder 12, the pressure in the air chamber 26 increases, the downward movement speed of the first piston 7 is reduced, and the first piston 7 The violent collision between the lower surface of the stepped portion 7a and the upper surface of the stepped portion 12a of the second cylinder 12 is alleviated. However, in the piston shock absorbing device using the air chamber 26 formed by fitting the first piston 7 and the second cylinder 12, the shock absorbing effect is low because the air chamber 26 does not have sufficient pressure at first. As the piston 7 gradually moves downward, the pressure in the air chamber 26 increases, and the buffering effect increases. In such a shock absorber, the first step is to improve the shock absorbing effect.
Inner peripheral wall surface 12b of piston 7 and second cylinder 12
It is possible to make the stroke of the first piston 7, which is the fitting surface with the first piston 7, longer, but this has the disadvantage that the entire operating device becomes larger. Also, even if the stroke is long as described above, the buffering effect will occur near the final position of the stroke, just like when the stroke is short, so there is no point in making the stroke longer, and if the stroke is lengthened, the piston will tilt. When the blade is moved downward, the end portion may become stuck to the stepped portion 12a of the second cylinder 12, and there is a possibility that shearing may become impossible. Furthermore, the buffering effect is the same as described above even when a withdrawal command is issued immediately after a supply command is issued.

The object of this invention is to eliminate the above-mentioned drawbacks, improve the buffering effect of the shock absorber, and provide a pneumatic operating device for a cutter and disconnector that can reliably operate the shock absorber upon a closing command.

An embodiment of this invention will be described below with reference to FIGS. 3 to 6. The same parts as in FIGS. 1 and 2 are denoted by the same reference numerals. 27 is a double piston that slides within the first and second cylinders 6 and 12;
This double piston 27 is composed of a large diameter piston 28 and a small diameter piston 29. The large diameter piston 28a is axially connected to piston shafts 28a, 28b.
There are recesses 3 in the piston shafts 28a and 28b.
0 is provided. The small diameter piston 29 is housed in the recess 30, and the small diameter piston 29 is slid within this recess 30. Said small diameter piston 2
A piston shaft 8 is integrally formed in the cylinder 9, and the piston shaft 8 is led out from the upper part of the first cylinder 6. Reference numeral 31 denotes a bottom plate member fitted into the opening of the recess 30. The bottom plate member 31 is provided with a communication hole 31a and a ventilation hole 31b, and a check valve 32 is provided in the communication hole 31a. Air is allowed to flow into the recess 30 at the time of injection. Reference numeral 33 designates a return spring for the small diameter piston 29. One end of this spring 33 is engaged with the bottom of the piston 29, and the other end is engaged with the inner surface of the bottom plate member 31. Reference numeral 34 denotes a stopper piece protruding in the radial direction from the inner peripheral surface of the second cylinder 12, and this stopper piece 34 prevents the large diameter piston 28 from descending. 35 is a sealing member. Reference numeral 36 denotes a shock absorber, which is disposed on the axis of the double piston 27 and has a cap-shaped chamber 37 recessed inwardly at the bottom of the second cylinder 12. A piston 38 is slidably fitted thereto. This piston 3
The head 38a of the second cylinder 12 extends through the wall 12b of the second cylinder 12 and projects into the second cylinder 12. Further, the bottom plate member 31 is provided on the upper surface of the head 38a.
The lower surface of the double piston 27 is brought into contact with the double piston 27 to alleviate the collision. At the center of the cap-shaped piston 38, an air shield section 38b extends downward.
39 is a member forming the chamber 37, and this member 3
9 includes an air supply hole 40 connected to the input air supply hole 14 and a communication hole 41 connected to the chamber 37.
A check valve 42 is provided in the communication hole 41 . The member 39 is also provided with a hole 43 into which the sheath section 38b is fitted, and this hole 43 is connected to the air supply hole 40 so that the air can be cut off when the sheath disconnector is disconnected. The air supply hole 40 is closed by the body 38b. 44, 45 are ventilation holes, 46
is the holding spring.

Next, the operation of the above embodiment will be described. FIG. 3 shows the state at the time of starting to close the breaker, and if a closing command is given now, the closing air is supplied from the direction of the arrow 47 shown in the figure. This air cannot flow into the second cylinder 12 because the air supply hole 40 has an air shield 38b, but instead flows into the chamber 37 of the shock absorber 36 via the communication hole 41 and the check valve 42. . This air moves the piston 38 upward and the shock absorber 36 is set. Due to the upward movement of the piston 38, the large diameter piston 28 is also moved upward, and the air shield section 38b is also moved upward. Therefore, the input air passes through the air supply hole 40 and the supply hole 14 to the second cylinder 1.
2 and the large diameter piston 28 is further moved upward.

Due to the upward movement of the large diameter piston 28, the shear spring 1
0 is stored. Furthermore, the input air is supplied to the communication hole 3.
It also flows into the recess 30 from 1a via the check valve 32, and the small diameter piston 29 is also moved upward. When the small diameter piston 29 reaches the position shown in FIG. 4, the sheath disconnector 1 is turned on. Figure 4 shows the state of the operating device when the breaker is completely turned on, and in this state as shown in Figure 4, air is supplied to the breaker supply hole 24 to ignite the breaker. . This air supply moves the piston 18 to the left in the figure, and the exhaust valve 16 is opened. This state is shown in FIG. 5, where the exhaust valve 16
When the second cylinder 12 is opened, the air in the second cylinder 12 is exhausted as shown by the arrow in the figure, and the large diameter piston 28 is rapidly moved downward by the action of the armature spring 10. Due to the downward movement of the large diameter piston 28, the small diameter piston 29
is also moved downward, and the lower surface of the bottom plate member 31 is exposed to the shock absorber 36.
The upper surface of the piston 38 is collided with the upper surface of the piston 38. However, since the chamber 37 of the piston 38 is filled with air as shown in FIG. 5, the force at the time of collision is alleviated by the piston 38. After the piston 38 collides, the air in the chamber 37 is compressed, increasing the buffering effect and reducing the piston speed. Since the air in the chamber 37 is gradually discharged through the vent hole 45, it is slowly moved downward, and when the shearing is completed, the air will be as shown in FIG. 6.
Therefore, the movable lead rod of the vacuum shield breaker 1 is buffered by the shock absorber 36 via the insulating rod, the piston shaft 8, the small diameter piston 29, and the large diameter piston 28. The speed at the time of heat breakage can be reduced. This eliminates the burden on the bellows, etc. of the vacuum chamber and disconnector, and improves the durability of the vacuum chamber and disconnector.
In addition, in the above embodiment, the case where the shear cutting is performed by a double piston structure and a spring action has been described, but the piston is not limited to a double piston, and a single piston may be used. It is also possible to supply air to the input side and exhaust the input side.

As described above, according to this invention, a buffer piston is disposed directly below the operating piston, and a part of the piston is extended downward to form an air chamber and a section, so that the operating air is Since the buffer piston is activated before the operating piston to generate a buffer force, even if a cut-off command is issued immediately after a closing command is issued, a buffering effect can be obtained reliably. In addition, since the buffer piston is placed below the operating piston, the pressure receiving area of the buffer piston can be increased, making it possible to absorb a large amount of energy and improve the buffering effect. . Furthermore, since operating air is used for both the operating piston and the buffer piston, both pistons can be driven smoothly. Furthermore, since the shock absorbing piston can be incorporated into the cylinder, the overall size can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a conventional example, FIG. 2 is a sectional view showing details of FIG. 1, and FIGS. 3 to 6 are sectional views showing an embodiment of this invention. 6...First cylinder, 8...Piston shaft, 10
...Shiyadan spring, 12...Second cylinder, 27...
...Double piston, 28...Large diameter piston, 29...
...small diameter piston, 30... recess, 31... bottom plate member, 32, 42... check valve, 33... spring, 36
...Buffer device, 37...Chamber, 38...Piston,
38b...Air sheath section, 39...Member, 40...
...Air supply hole, 43...hole.

Claims (1)

[Scope of utility model registration request] In an air operating device in which an operating piston that is slidably operated by supplying compressed air is inserted into a cylinder and the axis of the piston is led out of the cylinder, the air operating device is formed at the bottom of the cylinder directly below the operating piston. a buffer piston fitted into a chamber together with a holding spring on the same axis as the operating piston; a passage communicating with the chamber via a check valve and supplying air for operating the buffer piston; and this passage. An air supply hole for supplying operation air to the operation piston and a part of the buffer piston are provided to extend downward, and when the buffer piston is not operated, the air supply hole is closed and the air supply hole is connected to the operation piston. a buffer piston is provided with an air shield section operated by operating air, and a buffer piston is bored therein;
An air operating device for an air breaker, characterized in that the air operating device includes a flow hole that exhausts air from the room when the operating piston collides with a buffer piston.