JPS62109Y2 - - 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 uses 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.

A first piston shaft 8 is screwed onto the first piston 7 by a nut 9, and the first piston shaft 8 is always pressed in the shear direction (downward in the drawing) by a shear spring (not shown). 11 is the first cylinder 6
This is a ventilation hole drilled at the top of the 12 is a second cylinder, and this second cylinder 12 is connected and fixed to the first cylinder 6 by screws 13. In addition, the first
The cylinder 6 is formed in the large diameter part, and the second cylinder 12 is formed in the small diameter part. 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 path 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, 23
is an exhaust hole. This exhaust hole 23 is communicated with the opening 15 as described above. 24 is a closed air supply path. Note that the third cylinder 17 has a bolt 25
is fixed to the second cylinder 12 by.

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 path 14. With this air supply, the first piston 7 is moved upward while accumulating the force of a bow spring (not shown), and the vacuum interrupter 1 is closed. Next, when a shrunken command is issued, the switching valve 4 is switched, and the shunt air supply path 24 is transferred to the third cylinder 17.
air is supplied to. The second piston 18 is slid to the left by this air supply, and in order to open the exhaust valve 16, the first piston 7 is moved downward by the release of a bow spring (not shown). 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 and the first
The downward movement speed of the piston 7 is reduced, and the lower surface of the stepped portion 7a of the first piston 7 is aligned with the stepped portion 1 of the second cylinder 12.
The violent collision with the upper surface of 2a 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 absorbing device, in order to improve the shock absorbing effect, it is sufficient to make the stroke of the first piston 7, which is the fitting surface between the first piston 7 and the inner circumferential wall surface 12b of the second cylinder 12, long. This has the disadvantage that the entire device becomes large. Furthermore, even if the stroke is made long as described above, the buffering effect occurs near the final position of the stroke, just as when the stroke is short, so there is no point in making the stroke longer, and if the stroke is made longer, the piston 7 When tilted and moved down, the end
There is also a risk that the cylinder 12 will be caught by the stepped portion 12a, making it impossible to shred it.

The object of this invention is to provide an air operating device for a breaker, which can eliminate the above-mentioned drawbacks, improve the shock absorbing effect of the shock absorber, and reduce the size of the entire device.

An embodiment of this invention will be described below with reference to FIGS. 3 to 5. In FIGS. 3 to 5, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. Reference numeral 31 denotes an operating piston fitted into the large diameter portion of the first cylinder 6, and this operating piston 31 is fixed to the piston shaft 8 using a nut 9. This operating piston 31 is configured in a shape obtained by cutting off the lower stroke portion (the portion that fits into the second cylinder) of the first piston 7. Reference numeral 32 denotes a buffer piston formed of a cylinder with a flange 32a attached to the upper part, and this buffer piston 32 is fitted into the small diameter inner wall surface 12b of the second cylinder 12. 33 is an air chamber communicated with the input air supply hole 14, and this air chamber 33 is provided with a check valve 34. The input air supply path 14 communicates with the inner wall surface 12b and is closed by a buffer piston 32 when the breaker is disconnected. Reference numeral 35 denotes a stopper for the check valve 34. This stopper 35 is arranged near the center of the air chamber 33 to prevent the valve ball of the valve 34 from going to the upper part. Air circulation holes 36 are provided. 37 is a spring that holds the buffer piston 32 so that it does not fall from the position shown in FIG.
One end of this spring 37 is locked to the engaging portion 32b at the lower end of the buffer piston 32, and the other end is locked to the engaging portion 12c of the second cylinder 12. Reference numeral 38 indicates a vent hole formed in the buffer piston 32.

Next, the operation of the above embodiment will be described. In the state shown in FIG. 3 when starting to close the breaker, if a closing command is now given, air is supplied to the closing air supply path 14. Since the buffer piston 32 is in the position shown in FIG. 3, this air does not flow into the second cylinder 12, but flows into the air chamber 33 via the check valve 34. This incoming air causes the buffer piston 32 to start moving upward, pushing up the operating piston 31. When the buffer piston 32 is further moved upward and comes into contact with the stopper portion 6a of the first cylinder 6 as shown in FIG. is the second cylinder 1
2, the operating piston 31 is rapidly moved upward and reaches the closing position shown by the two-dot chain line in FIG. This upward movement of the operating piston 31 stores energy in a bow spring (not shown). FIG. 4 shows the state of movement of the operating piston 31 until the closing of the breaker is completed, and the second cylinder 12 is in a charged state after the closing is completed. Further, the buffer piston 32 is prevented from being lowered by a spring 37. In order to deflate the mustard cutter in the closed state shown in FIG. 4, air is supplied to the mustard cutoff supply hole 24. Due to this air supply, the second piston 18 is moved to the left in the figure, so the exhaust valve 1
6 is released. This state is shown in FIG. 5. When the exhaust valve 16 is opened, the air in the second cylinder 12 is exhausted, and the operating piston 31 is rapidly moved downward by the action of a bow spring (not shown) to provide a buffer. The upper surface of the collar 32a of the piston 32 collides with the upper surface of the collar 32a. Since the buffer piston 32 has an air reservoir 33a having a predetermined pressure formed in the upper part of the air chamber 33, the initial collision force of the operating piston 31 can be reliably alleviated. Therefore, the movable lead rod (not shown) of the vacuum shield and disconnector 1 is buffered via an insulating rod (not shown) and the piston shaft 8, reliably solving the conventional problems. This eliminates the burden on the bellows, etc., and improves the durability of the vacuum shield and disconnector. After the collision of the operating piston 31, the buffering piston 32 is gradually moved downward via the vent hole 38 which compresses the air in 33a to generate a buffering effect and decelerate the speed.

FIG. 6 is a characteristic diagram showing the relationship between the shock absorbing piston stroke and the internal pressure. The case of ^cm2 is shown. From both curves A and B, it can be seen that as the piston stroke becomes longer, the pressure increases rapidly, which increases the effect of the damping effect. In other words, even if the force at the time of collision is 70 kg/cm ³ , the damping piston stroke length of only 20 mm can provide sufficient damping.

Next, another embodiment of the present invention will be described with reference to FIGS. 7 and 8, in which the same parts as in FIGS. 1 to 5 are denoted by the same reference numerals. 31 is an operating piston, and this operating piston 31 is connected to the piston shaft 8.
It is fixed using a nut 9. This operating piston 31 is configured in a shape obtained by cutting off the lower stroke portion (the portion that fits into the second cylinder) of the first piston 7. A shock absorber piston 32 is formed of a cylinder with a flange 32a attached to the upper part, and this piston 32 is fitted into the inner wall surface 12b of the second cylinder 12. 33 is an air chamber, and this air chamber 33 is communicated with a hole 38 bored in the second cylinder 12 via a check valve 34. This hole 38 is connected to a shrunken air supply pipe 37 via a pipe 36. 3
5 is a stopper of the check valve 34, and this stopper 35
is disposed in the center of the air chamber 33 to prevent the valve ball of the check valve 34 from protruding upward. Further, the stopper 35 is provided with a plurality of air circulation holes. 38 is a ventilation hole bored in the piston 32. The input air supply path 14 is provided at the lower part of the second cylinder 12, and the cut-off air supply path 24 is connected to the pipe 37.

Next, the operation of the above embodiment will be described. In the state shown in FIG. 7 when starting to close the breaker, when input air for the closing command is now applied from the supply path 14, the operating piston 31 is moved upward, and the piston 31 is placed in the position shown in FIG.
When it reaches that point, the breaker is turned on. At this time, the disconnection spring (not shown) is charged. After the injection is completed, the inside of the second cylinder 12 is filled with air. Next, when air for curing is applied from the pipe 37 as shown by the arrow in the figure, this air flows into the air chamber 33 through the pipe 36, the hole 35, and the check valve 34. This incoming air causes the buffer piston 32 to rise to the position shown in FIG. On the other hand, the shunt air flows into the third cylinder 17 from the shunt supply path 24, and moves the second piston 18 to the left in the figure. Therefore, the exhaust valve 16 is opened as shown in FIG. 8, and the air in the second cylinder 12 is exhausted from the exhaust hole 23 as indicated by the arrow in the figure. As a result, the operating piston 31 is rapidly moved downward and collides with the upper surface of the collar 32a of the buffer piston 32. Since the buffer piston 32 has an air reservoir 33a having a predetermined pressure formed by damp air in the upper part of the air chamber 33, the force when the operating piston 31 collides with the buffer piston 32 is alleviated. After the collision, the operating piston 31 is gradually lowered as the air flowing out from the vent hole 38 is reduced. Therefore, the movable lead rod of the vacuum shield and disconnector 1 is buffered via the insulating rod and the piston shaft, and no load is placed on the bellows, etc., and the durability of the vacuum shield and disconnector can be improved.

In the above-mentioned embodiments, the case where the shingle cutting is performed by a spring has been described, but it is also possible to supply compressed air to the shingle cutting side and exhaust the input side. As described above, according to this invention, the shock absorbing piston is fitted onto the inner circumferential surface of the cylinder and the shock absorbing piston is operated along the inner circumferential surface of the cylinder, so that the shock absorbing effect when the operating piston collides with the inner circumferential surface of the cylinder is improved. Moreover, since the shock absorbing piston can be housed in the cylinder, it is possible to downsize the shock absorbing device.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic configuration diagrams and enlarged sectional views of the operating device of a conventional example, Figures 3 to 5 are sectional views of an embodiment of this invention, and Figure 6 is a shock absorbing piston stroke. The characteristic diagrams of internal pressure and FIGS. 7 and 8 are cross-sectional views showing other embodiments of this invention. 6...First cylinder, 8...Piston shaft, 12
...Second cylinder, 31...Operating piston, 32
...Buffer piston, 33...Air chamber, 34...
Check valve, 35...stopper, 37...spring, 38
...Vent hole, 33a...Air reservoir.

Claims (1)

[Claim for Utility Model Registration] An operation piston that is slidably operated by supplying compressed air is inserted into a cylinder, and the piston shaft is led out of the cylinder and is interlocked and connected to the movable shaft of the shredder. In an air operating device for a power cutter or disconnector, a large diameter part into which the operating piston is inserted into the cylinder and a small diameter part into which the buffer piston is inserted are connected to form a stepped part, and the buffer piston is formed of a cylinder with a flange that abuts the upper surface of the stepped part, and the cylinder is fitted into the small diameter part of the cylinder, and the flange is fitted into the large diameter part of the cylinder so as to face the operating piston, The shock absorbing piston is moved upward by air from an air supply path formed in the cylinder so as to open on the top surface of the stepped portion to form an air reservoir between the collar and the stepped portion, and the operating piston acts as a buffer. 1. An air operating device for a shear breaker, characterized in that the buffer piston is provided with an air hole that compresses the air in the air reservoir and exhausts the compressed air into the cylinder when the buffer piston collides with the buffer piston.