JPS6140045Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a control valve for a breaker.

FIG. 1 is a sectional view showing a conventional control valve of this type. In the figure, reference numeral 1 denotes a valve body, which consists of a cylindrical valve 2 and a valve box housing the cylindrical valve 2, and the figure shows the valve in a closed state. A low pressure chamber 21 is formed inside the cylindrical valve 2 (or the cylinder portion 31), and the cylindrical valve 2 is operated by a drive unit (not shown) via an operating rod 22.

The valve box 3 is provided with a cylinder part 31 that slides and guides the cylindrical valve 2, and one side of the cylinder part 31 is provided to communicate the low pressure chamber 21 with the outside of the valve body 1.
A discharge part 32 that is opened and closed by the cylindrical valve 2, a compressed fluid introduction part 33 that is provided on the other side of the cylinder part 31 and that is opened and closed by the cylindrical valve 2, and this introduction part 3.
A delivery part 34 for delivering the compressed fluid introduced from 3 to the operation cylinder part (not shown) of the shield cutter.
A pair of valve seats 35 and 36 are provided for abutting against the end face of the cylindrical valve 2 to maintain airtightness. In addition, 4 is a sealing material for maintaining airtightness,
37 is a high pressure chamber formed outside the cylindrical valve 2 as shown in the figure.

Next, the operation will be explained.

When a signal for operating a disconnector (not shown) is given, the cylindrical valve 2 is moved from the closed state in FIG. 1 in the direction of arrow A by a drive unit (not shown) via the operating rod 22. When a gap is created between the cylindrical valve 2 and the valve seat 35, compressed fluid begins to flow from the high pressure chamber 37 into the low pressure chamber 21, flows into the breaker operating cylinder (not shown) via the delivery part 34, The breaker is operated. After the cylindrical valve 2 moves through its stroke C and fully opens, it comes into pressure contact with the valve seat 36 and opens the low pressure chamber 2.
1 and the outside of the valve body 1, and the low pressure chamber 21 is formed as a high pressure chamber. While the cylindrical valve 2 moves through its stroke C, a portion of the compressed fluid escapes to the outside (usually to the atmosphere) through the exhaust 7.

Due to its nature, the breaker is required to operate at a very high speed, and therefore the control valve must also operate at a very high speed. Sometimes it works. If the cylindrical valve 2 collides with the valve seat 36 at this speed, this valve seat is generally made of rubber material, so it temporarily provides some cushioning effect, but in the long run it becomes a serious problem. . Further, in order to withstand this impact force, the cylindrical valve 2 and the like are required to have high mechanical strength.

In order to eliminate this drawback, the present inventor first developed a second
As shown in the figure, a space 5 surrounded by the cylindrical valve 2 and the cylinder part 31 is formed between the cylindrical valve 2 and the cylinder part 31, and the fluid in the space 5 is compressed at the end of the operation of the cylindrical valve 2. We proposed a device that buffers 2. (Japanese Patent Application Laid-open No. 148832/1983) Although the effect of the above improved device is excellent, the cylindrical valve 2
Forming the protrusion 23 on the outer periphery of the device increases the size and weight of the device, which is particularly disadvantageous for large devices.

The purpose of this invention was made in view of the above points, and is to provide a control valve that is small in size and has a good damping effect.

An embodiment of this invention will be described below with reference to the drawings.

Figures 3 and 4 are diagrams for explaining the valve opening operation of an embodiment of this invention, and parts with the same reference numerals as those in Figure 1 are the same or have the same functions, so the explanation will be omitted. .

FIG. 3 shows a state in which the cylindrical valve 2 has moved by a stroke D at the initial stage of the valve opening operation, and the step portion 38 provided in the valve body 3 and constituting the closing means and the inner peripheral surface end of the cylindrical valve 2 are connected to each other. are about to mate. That is, in the valve opening operation after stroke D, the flow from the discharge part 32 to the outside is blocked, and the low pressure chamber 2
1 changes into a high pressure chamber with the inflow of high pressure fluid. That is, in the conventional device (FIGS. 1 and 2), compressed fluid leaked into the external atmosphere through the discharge part 32 while moving through the stroke C, whereas in the case of the present invention, the leakage is prevented. This is only during the movement of the stroke D, and the fluid pressure can be used effectively.

FIG. 4 shows a state in which the cylindrical valve 2 has further moved in the direction of arrow A and has moved by a stroke E. Note that C>E>D.

In FIGS. 3 and 4, reference numeral 6 is formed to be surrounded by an annular protrusion outer peripheral surface 39 that protrudes inside the valve box 3 and a protrusion 22 that protrudes inside the cylindrical valve 2. It is a space part where

In the state shown in Fig. 3, which shows the state before Fig. 4,
Since the low-pressure chamber 21 is converted into a high-pressure chamber, the space 6 is compressed by the high-pressure fluid, and even though the volume is relatively small, the buffering effect of the cylindrical valve 2 can be expected to be sufficient. 2, the device can be made smaller.

Also, as shown in FIG. 3, at the beginning of the operation, the discharge section 32
Since communication between the valve body and the cylindrical valve and the atmosphere is prevented, the valve seat 36 which was conventionally required is no longer necessary.

It is clear that when particularly strong buffering is required, the effect will be even greater if the present invention is used in combination with the one shown in Figure 2 above, in which a similar space is provided on the high-pressure chamber side. be.

As explained above, the control valve according to this invention is provided with a closing means for closing the discharge part after the initial opening of the valve, and a protruding part is provided inside the cylindrical valve, and the space that is blocked by the movement of this protruding part is provided. Since it has a simple structure in which only one section is provided, the device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an example of a conventional control valve for a breaker, Fig. 2 is a longitudinal cross-sectional view showing another conventional example, and Figs. 3 and 4 show an embodiment of this invention. FIG. 3 shows the initial stage of the valve opening operation, and FIG. 4 shows the final stage. 1...Valve body, 2...Cylindrical valve, 21...Low pressure chamber,
22...Protrusion part, 3...Valve box, 31...Cylinder part, 32...Discharge part, 33...Introduction part, 34...
Sending part, 38... Closing means, 6... Space part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A cylindrical valve having a low pressure chamber formed inside, a cylinder portion that slides and guides the cylindrical valve, a discharge portion provided on one side of the cylinder portion so as to communicate the low pressure chamber with the outside of the cylinder, and the cylindrical valve. A closing means for closing the discharge part after the initial opening/closing operation of the cylinder part, a compressed fluid introduction part provided on the other side of the cylinder part and opened when the cylindrical valve is opened, and a part protruding inside the cylindrical valve. and a space formed to be closed by the protrusion at the end of the valve opening operation of the cylindrical valve, and compress the fluid in the space to buffer the cylindrical valve. A control valve for the breaker.