JPH0615378Y2 - Manual valve for pressure drop in accumulator circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a manual valve for pressure drop of a pressure accumulator circuit for decreasing the pressure of high-pressure liquid stored in a pressure accumulator.

[Prior Art] Conventionally, as a drive source of a device that performs linear or rotary motion,
A gas pressure such as air or a liquid pressure such as oil is used, and an air pressure operating device is often applied to a relatively light load.

However, when the load becomes large, for example, around several tons,
Pneumatic operating devices are disadvantageous in that they are large in size, noise associated with supply and exhaust during operation increases, and maintenance costs for compressors that generate air pressure increase, so operating systems that use liquid pressure such as hydraulic pressure are used. Often.

A hydraulic operating device, particularly a hydraulic operating device, has many advantages such as high pressure compared to pneumatic pressure due to the incompressibility of oil, resulting in less noise during operation and reduction in size of the device.

Among such devices, a switchgear used in a power transmission system is a typical one.

In the detailed description of the present invention, the features of the present invention will be described taking the operating device of the power switching device as an example, but it goes without saying that it can be applied as an operating device of other devices similar to this.

FIG. 3 shows a conventional hydraulic operating device disclosed in, for example, Japanese Patent Application Laid-Open No. 59-79919. In FIG. 3, (1) is an opening / closing part of a switch, for example, a circuit breaker, and a fixed contact (2) and It is composed of a movable contact (3) and is opened and closed by being driven by a drive device (4). The drive (4) is a rod connected to the movable contact (3)
It is composed of a differential piston (6) having (5) and a cylinder (7), and a packing (6a) liquid-tightly seals between them. The pipe line (8) connected to the head side (large area side) (7a) of the cylinder (7) is attached to the hydraulic pressure control device (9), and this hydraulic pressure control device (9) has a low pressure tank (10). ) Is attached via the low-pressure line (11). Further, an accumulator (13) is connected to the rod side (small area side) (7b) of the cylinder (7) through a port (12), and a high pressure line (14) is connected to the hydraulic pressure control device (9). It communicates with. A piston (13a) is provided inside the accumulator (13), and a packing (13b) liquid-tightly seals N ₂ gas and oil on both sides of the piston.

Furthermore, the pump unit (15) that supplies high-pressure liquid is an electric motor.
Driven by (19), the liquid discharged into the low-pressure tank (10) is recovered via the pipelines (17), (18), and the pipeline (16), the check valve (20),
High-pressure liquid is supplied to the accumulator (13) via the high-pressure line (21). The check valve (20) is composed of a ball (20a) and a spring (20b).

The manual valve (22) for pressure drop is the high pressure oil that is boosted by the pump (15) and stored in the accumulator (13), that is, the check valve (2
It is for releasing the high pressure oil on the side of the accumulator (13) and the drive unit (4) as seen from 0) to the low pressure tank (10) via the pipe lines (23) and (17).

The pressure gauge (24) is for visually confirming the hydraulic pressure of this hydraulic operating device, and the pressure switch (25) is for detecting the operation command pressure of the electromagnetic switch (not shown) of the pump drive motor and It is for detecting an abnormal pressure drop due to oil leakage from the line, and is provided in the middle of the high pressure line (21).

Next, the operation of the switch and the operating device configured as described above will be described. Differential piston (6) rod side (7
The high pressure liquid from the accumulator (13) is constantly supplied to b) via the port (12). When an operation command is given to the hydraulic pressure control device (9) to open the opening / closing part (1), the high pressure liquid supplied to the head side (7a) of the differential piston (6) via the pipe line (14). Is a low pressure tank via line (8) and line (11)
It is discharged to (10). At this time, the supply path of the high-pressure liquid to the conduit (8) is closed at the same time. As a result, the force of the high-pressure liquid on the rod side (7b) of the differential piston (6) moves the differential piston (6) downward, and the opening / closing part (1) is opened to the state shown in FIG.

Next, when an operation command is given to the hydraulic pressure control device (9) in order to close the opening / closing part (1), the communication passage from the pipeline (8) to the low pressure pipeline (11) is closed, and at the same time, the pipeline is closed. The supply passage of the high pressure liquid to the passage (8) is opened, and the pipe passage (8) communicates with the high pressure pipe passage (14). As a result, high-pressure liquid is supplied to both the head side (7a) and the rod side (7b) of the differential piston (6), and the thrust generated by the area difference between the head side and the rod side causes the differential piston (6) Moves up, so the opening / closing part (1) is turned on. In the closed state of the opening / closing part (1), the pipeline (8) is filled with high-pressure liquid.

In such operating devices for switches, it is necessary to quickly release the high-pressure oil inside the accumulator (13) and the differential piston for the safety reasons of workers at the time of regular inspection. A manual valve (22) is used.

FIG. 4 shows an example of the structure of the manual valve for pressure drop (22) in detail. The manifold block (30) is a manual valve for pressure drop.
It constitutes the container of (22) and has a high pressure port (30a) connected to the high pressure line and a low pressure port (30b) connected to the low pressure line. The ball (31) has a function as a valve body, and forms a valve in combination with a seal seat (30c) formed at the inner end edge of the outlet of the manifold block (30) through which high-pressure oil flows out. . The pressing force of the spring (32) rests on the ball (31).
The ball (31) is moved through the seal seat (3) by the linear movement of the manual push rod (34) in the opposite position, which is applied via the (33).
0c), and closes or opens the annular flow path (35) formed by the seal seat (30c) and the push rod (34). (36) is the ball
(31) A guide container for suppressing lateral movement, with a flow path on the side.
It has (36a).

Next, the operation of such a conventional manual valve (22) for pressure drop will be described with reference to FIG. Figure 4 (a) shows the manual valve (22)
When the push rod (34) is moved to the right in the figure from this state by operating a handle or the like (not shown), the ball (31) will move to high pressure oil as shown in the figure (b). Moves to the right by overcoming the oil pressure of and the pressing force of the spring (32). As a result, the high pressure oil is discharged to the low pressure port (30b) via the flow paths (36a) and (35). At this time, the flow path (36
Since a) and (35) act as throttles, the outflow rate of the high-pressure oil, ie the rate of pressure drop, is governed by the size of these throttles.

[Problems to be solved by the invention] The pressure drop manual valve of the conventional accumulator circuit as described above has a pressure drop speed in order to reduce the power failure time when inspecting the switch and the influence on other devices. Must be configured as quickly as possible to reduce the work time, and therefore the flow path (36
It is desirable that the sizes of a) and (35) are as large as possible.

On the other hand, when trying to adjust the pressure switch (25) of such a switch operating device with high accuracy at a factory or local substation,
Since it is necessary to slightly reduce the pressure using the manual lowering valve (22), the sizes of the flow paths (36a) and (35) of the conventional manual lowering valve (22) should be in the middle of the balance between the two. However, as a result, there is a problem in that it is not possible to exhibit satisfactory performance for any purpose. The present invention has been made to solve the above problems, and while using a configuration similar to the conventional one,
An object of the present invention is to obtain a manual valve for pressure drop of a pressure accumulator circuit that can perform both a rapid pressure drop during inspection and a minute pressure drop during pressure switch adjustment with a single device.

[Means for Solving Problems] A pressure reducing manual valve of a pressure accumulating circuit according to the present invention is a manifold block provided with an inflow port for inflowing a high pressure liquid and an outflow port for outflowing a high pressure liquid from the inside. And a seal seat provided on the inner edge of the outlet of the manifold block, and has a bottomed cylindrical shape, so that the opening end of the manifold sits close to the inner wall surface of the manifold block around the seal seat. A guide container that is linearly movable inside the block and a guide container that is moved so as to come into contact with and separate from the seal seat, and moves to the guide container while being separated from the seal seat. The seal seat and the valve body are provided with a valve body for transmitting force, a moving means for moving the valve body, and a throttle hole formed in the guide container so as to communicate the inlet side and the outlet side. Constitutes the first valve portion, or Second, the inner wall surface of the manifold block around the seal seat and the opening end of the guide container constitute the second valve portion.

[Operation] In this invention, first, the valve body comes into contact with the seal seat to close the first valve portion, and the open end of the guide container comes into contact with the inner wall surface of the manifold block around the seal seat to form the second valve portion. The valve part of is closed. Therefore, when the valve body is moved by the moving means, the valve body separates from the seal seat, the first valve portion is opened, and the high pressure liquid flows out from the throttle hole through the first valve portion. Furthermore, when the valve body is moved by the moving means and the variation amount of the valve body exceeds a predetermined value, the moving force of the valve body is transmitted to the guide container and the guide container is moved. Then, the opening end of the guide container separates from the inner wall surface of the manifold block around the seal seat, the second valve portion is opened, and the high-pressure liquid flows out from the second valve body through the first valve body. To do.

[Embodiment] FIG. 1 shows an embodiment of the present invention. In FIG.
A gap (38) is formed between the manifold block (30) of the pressure reducing manual valve (42) and the back part (46d) of the guide container (46), and the back part (46d) is formed via the oil passage (30e). High pressure oil is always acting on). A throttle hole (46b) for restricting the flow rate of oil to a minute amount is provided on the side portion of the guide container (46).

The guide container (46) is slidable right and left inside the manifold block (30), and its opening end (46c) is finished smoothly, and the peripheral portion (30f) of the seal seat (30c), that is, Manifold block (30) around seal seat (30c)
The second valve portion is formed in contact with and separated from the inner wall surface of the. When the second valve portion is opened, the flow path (37) is formed.

In addition, the same reference numerals as those in FIG. 4 indicate the same parts.

Next, the operation will be described. FIG. 1 (a) shows a closed state of the pressure reducing manual valve (42), in which a push rod (34) as a moving means is moved rightward in the figure within a predetermined amount by operating a handle or the like (not shown). Then, as shown in FIG. 6B, the ball (31) forming the valve body overcomes the hydraulic pressure of the high-pressure oil and the pressing force of the spring (32) and moves to the right. As a result, the first valve including the seal seat (30c) and the ball (31) is opened, and the high pressure oil is discharged to the low pressure circuit through the throttle hole (46b) and the flow path (35). At this time, the outflow speed of the high-pressure oil is the throttle hole (46b).
The pressure switch (25) shown in FIG. 3 can be adjusted very accurately with a very small pressure drop rate.

When the push rod (34) is moved further to the right in the figure by a predetermined amount, the spring bearing (3) is passed through the ball (31) as shown in (c) of the figure.
3) moves to the right and contacts the lower portion (46d) of the guide container (46) pressed to the left by the high pressure oil to move the guide container (46) to the right by a predetermined amount. As a result, the second valve composed of the open end portion (46c) and the peripheral portion (30f) of the guide container (46) is opened, and the high pressure oil passes through the flow paths (37) and (35). It is discharged to the low voltage circuit. At this time, since the flow path (37) changes according to the movement amount of the push rod (34), the outflow rate of the high pressure oil should be controlled according to the flow amount (37), that is, the movement amount of the push rod (34). You can
Of course, move the push rod (34) to the right enough to
If the cross-sectional area of 7) is made larger than the cross-sectional area of the flow path (35), the pressure drop rate can be set to a speed that is determined by the flow path (35) and that is sufficiently suitable for any inspection work. The relationship between the pressure drop rate and the movement amount of the push rod (34) is qualitatively shown in FIG.

When the push rod (34) is returned to the left, first the guide container (4
6) returns to the left due to the pressure of the high pressure oil and closes the second valve section,
Further, the ball (31) returns to the left, and the first valve portion formed by the seal seat (30c) and the ball (31) of the manifold block (30) is closed.

Even if the throttle hole (46b) is provided in the lower part of the guide container (46),
There is no difference in the basic operation of this device, and the spring (32)
Direct guide container (46) with ball (31) without spring holder (33)
It goes without saying that the same operation function is provided even if is moved. It is also clear that a similar effect can be obtained by using a conical poppet valve that can serve as a valve body instead of the ball. Furthermore, if the thickness of the tip of the push rod (34) is changed stepwise or continuously so that the cross-sectional area of the flow path (35) changes when the push rod moves, the pressure drop rate can be further improved. It can be changed in various ways.

[Advantage of the Invention] As described above, according to the present invention, the container for guiding the valve body forming the first valve portion can be moved linearly, and the guide container is provided with the throttle for controlling the flow velocity. A second valve portion is formed at the end of the guide container, and the first valve portion is formed when the push rod moves by a predetermined amount.
Valve is opened and the second rod is opened by moving the push rod. Therefore, while using almost the same parts as before, a rapid pressure drop during inspection and pressure switch It is possible to perform either a slow pressure drop during the adjustment of
This has the effect of always obtaining the optimum pressure drop rate for the work.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG.
FIG. 3 is a circuit diagram of a conventional hydraulic operating device for a switch, and FIG. 4 is a side sectional view of a conventional manual valve for pressure drop. (30c) …… Seal seat, (30f) …… Seal seat periphery, (31)
...... Ball (valve body), (42) ...... Manual valve for pressure drop, (46)
...... Guide container, (46c) …… Open end, (46b) …… Throttle hole. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A pressure-reducing manual valve of a pressure accumulation circuit for reducing the pressure of high-pressure liquid stored in a pressure accumulator, comprising: an inflow port into which the high-pressure liquid flows, and a flow from which the high-pressure liquid flows out. A manifold block provided with an outlet, a seal seat provided at an inner end edge portion of the outlet of the manifold block, and a bottomed cylindrical shape, the opening end of which is the manifold in the peripheral portion of the seal seat. A guide container linearly movable inside the manifold block so as to come in contact with and separate from the inner wall surface of the block, and a guide container guided so as to come into contact with and separate from the seal seat so as to be movable. And, a valve body that transmits a moving force to the guide container in a state of being separated from the seal seat, a moving unit that moves the valve body, and a front portion so as to communicate the inlet side and the outlet side. A throttle hole formed in the guide container, and the seal seat and the valve body constitute a first valve portion, and the inner wall surface of the manifold block around the seal seat and the guide. Second with the open end of the container
A manual valve for pressure drop of a pressure accumulator circuit, characterized in that it is configured as a valve part of.