JPS6221206B2 - - Google Patents

Description

[Detailed description of the invention] As the capacity of the disconnector increases, it requires a large operating force, and for this reason, pressurized fluid such as compressed air is used as a power source for operation. They are becoming larger as the capacity increases. An object of the present invention is to provide an operating valve device that is compact and has high performance in this type of breaker.

Figure 1 shows the structure and related parts of a conventional operating valve device as an example of this type of shield breaker, when compressed air is used as the power source for the shield operation of a puffer-type insulating gas shield breaker. The configuration is shown below. The figure shows a case where the armrest 1 is in the closed state, and by giving a tripping command to the movable valve drive mechanism 2, the operating valve device 3
Inside the body 4, the movable valve 5 moves downward from the position shown in the figure, and the floating valve 6 moves down slightly together with it, and is then prevented from moving by the stopper 4a, so that a flow path is opened between them. Therefore, the compressed air in the air tank 7 flows into the operating cylinder 8 and acts on the piston 9, and the operating rod 10 is driven to the right, causing the crank lever 12 attached to the operating main shaft 11 to move.
The shattered breaker 1 is brought into the shattered state via the. Near the end of this tripping operation, the operating main shaft 11 operates the movable valve drive mechanism 2 in the return direction via the coupling mechanism 13, and the movable valve 5 moves upward and its tip is attached to the flange portion 6a of the floating valve. The valve seat 6b contacts the valve seat 6b, thereby cutting off the flow of compressed air from the air tank 7 to the cylinder 8. At the same time, since the shingle retaining mechanism (not shown) in the attached mechanism 14 fixes the operating rod 10 in the shingled position, the shingle section 1 is held in the shingled state and the shingle is not broken. The operation is complete.

At the time of closing, the holding mechanism is unlocked in response to a closing command, and the closing operation is performed by the restoring force of a closing spring (not shown) stored during the cutting operation.

Here, a compression spring 15 is provided on the idler valve 6 so that an appropriate contact pressure is applied to the contact portion when the movable valve 5 comes into contact with it. It consisted of a single large diameter compression spring wrapped around the outside. However, with such a configuration, the following drawbacks cannot be avoided.

(1) If both ends of the compression spring 15, that is, the end turn portion, are not finished completely parallel, the end turn portion will not come into contact with the flange portion 6a of the idler valve 6 in an even manner, and therefore the end turn portion will not be made evenly around the entire circumference. No contact pressure is applied,
There is a risk of air leakage occurring when the valve device is closed, or sticking at the sliding portion with the body 4 when the floating valve 6 is operated.

(2) During operation of the movable valve 5, after its tip contacts the valve seat 6b of the idler valve 6, the idler valve 6 is further pushed up and the spring 15 is compressed, a so-called wipe operation is performed. Each time, a rotational force acts so that the end of the spring 15 is slightly displaced in the circumferential direction, causing the valve seat to twist in the circumferential direction and accelerating its wear.

(3) A large-diameter compression spring with a low spring constant has a relatively large number of turns, and requires a large space to accommodate it, making the entire operating valve device large.

(4) When it is necessary to change the contact pressure between the movable valve 5 and the valve seat 6b of the floating valve, such as when the working pressure range is different or when different operating characteristics are required, etc. It is necessary to prepare several types of springs with different loads, and in this case, each spring has a different size and number of turns, so a valve device of a size corresponding to the spring is required.

The present invention eliminates these drawbacks and will be described below with reference to embodiments.

FIG. 2 is a sectional view showing an embodiment of the operating valve device according to the present invention, and FIG. 3 is a perspective view of the floating valve.

In both figures above, the flange portion 1 of the idler valve 16
6a is provided with a plurality of recesses or counterbore holes 16b, each of which is provided with a small compression spring 16c.
are positioned so that the lower ends fit together and are held together without fear of movement. Although only the operating valve device 17 is shown in FIG. 2, other related parts are the same as those in FIG. Only the outer dimensions of the counterbore holes are shown, and the compression springs of the other counterbore holes are shown by center lines for simplicity.

The operation in this case is the same as in the case of FIG. 1 above. That is, when a tripping command is given to the movable valve drive mechanism 2, the movable valve 18 begins to descend, and at the same time, the idle valve 16 also descends with its valve seat 16d in contact with the movable valve 18, and soon the stopper provided on the body 19 closes. The flange portion 16a comes into contact with the flange portion 19a and stops, but only the movable valve 18 moves further down and
It comes into contact with the valve seat 19b at the bottom of the body 19 and stops. Thereafter, the shearing operation is performed as explained in FIG. Note that the closing operation is also performed in the same manner as in the case of FIG.

In this way, a plurality of small compression springs 16c are used in parallel as compression springs for driving the idler valve, and the lower end of each compression spring is held by a counterbore provided in the flange of the idler valve. The following effects can be obtained.

(1) Since there is no risk of the compression spring moving, uniform pressure is always applied to the flange portion 16a of the idler valve. Therefore, even contact pressure is applied to the entire surface of the valve seat 16d, and there is no risk of air leakage. Also, since the position of the point of action of the compression spring on the floating valve flange is always kept constant, the floating Also, the valve 16 does not get twisted.

(2) For this reason, the movable valve 18 is an idler valve seat 16d.
Even if the compression spring 16c is further compressed and a wiping operation is performed after contacting the idler valve 16, no rotational force is applied to the idler valve 16, and there is no risk of twisting the valve seat.

(3) Since the compression springs are small and there are a plurality of them, the storage space is small, and the operating valve device can be made smaller.

(4) Instead of providing compression springs in all of the counterbore holes 16b of the floating valve, compression springs 16c are provided only in appropriate portions of the counterbore holes, and the compression spring 1
By changing the number of valves 6c, the contact pressure between the idle valve 16 and the movable valve 17 can be varied over a wide range, thereby making it possible to standardize the operating valve device.

As explained above, the present invention can eliminate the drawbacks that have arisen in the operation of conventional idler valves and provide many advantages.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a cross section of a conventional operating valve device and the configuration of a shingle disconnection operating mechanism related thereto, FIG. 2 is a sectional view showing an embodiment of the operating valve device according to the present invention, and FIG. The figure is a perspective view showing the external shapes of an idler valve and a compression spring. 7...Air tank, 8...Operation cylinder, 16
...Idle valve, 16a...Flange part, 16b...
Counterbore hole, 16c...compression spring, 17...operating valve device, 18...movable valve.

Claims (1)

[Claims] 1. An operating valve device for opening and closing the flow path of the pressure fluid is provided between the pressure fluid source for driving the sheath breaker and the cylinder for operating the shoater, and the operating valve device a movable valve that is driven; and an idler valve that is provided opposite to the movable valve and that opens and closes the pressure fluid flow path between the movable valve and the movable valve by the operation of the movable valve; In an apparatus configured to apply contact pressure to a contact portion between the movable valve and the flange portion of the floating valve by a compression spring when the valve contacts and closes the flow path,
The said compression spring is comprised of a plurality of compression springs provided in parallel on the flange portion of the floating valve, each end of which is held in a counterbore provided in the flange portion of the floating valve. Dexterity operated valve device.