JP2003113811A - Rotary valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary valve device which reduces an installation space, and a production cost and that prevents a trouble such as oil leakage from occurring by simplifying the device and placing its components functionally. SOLUTION: In this rotary valve device in which a valve body is rotatably mounted inside a valve box and the valve body is opened/closed by rotating a valve shaft by a hydraulic cylinder, a hydraulic pump 17 is provided in a head block 16 of the hydraulic cylinder 11. Also an oil tank 15 is provided on an outer circumferential portion of a cylinder casing 11a and a hydraulic control valve group 19 is provided adjacent to the head block 16. Accordingly, the hydraulic cylinder 11 and a hydraulic unit 14 are integrated, the cylinder 11 is swingably supported by the valve box, and a valve shaft 4 is rotated by the linear motion of a piston rod 12 to open/close the valve body 5. Consequently, a rotary device is simplified and downsized, which reduces the installation space, the production cost, and the trouble such as oil leakage or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve installed in pipes for water and sewage, electric power, plant equipment, etc. and used for closing pipelines and controlling flow rate. Regarding the valve device.

[0002]

2. Description of the Related Art As a device for opening and closing a valve body of a rotary valve, a hydraulic opening / closing device has been conventionally used as shown in FIG. 11 for a butterfly valve. In FIG. 11, a valve body 44 is attached to a valve shaft 43 provided by being inserted into a valve box 42 of a valve body 41, and a piston rod 46 of a hydraulic cylinder 45 is connected to one end of the valve shaft 43. The reciprocating motion of the piston rod 46 causes the valve shaft 43 to rotate,
The valve body 44 is opened and closed. The hydraulic cylinder 45 is pipe-joined to a hydraulic unit 47 including a hydraulic pump, a drive motor for the hydraulic pump, a hydraulic control valve, and an oil tank to form an oil flow required for reciprocating movement of the piston rod 46. The hydraulic unit 47 and the control panel 48 for operating the hydraulic unit 47 are connected by electric wiring.

On the other hand, in Japanese Unexamined Patent Publication No. 10-220413, as shown in FIG. 12, a motion converting mechanism portion 51 is provided between a main cylinder 49 and a sub cylinder 50, and a piston rod 52 is provided inside the main cylinder 49. A valve drive device in which the tip portion is inserted so as to project into the sub cylinder 50, and the piston portion 53 that slides reciprocally along the inner peripheral surface of the sub cylinder 50 is fixed to the tip portion is provided. It is shown.
In this valve drive device, a Scotch yoke 55 fixed to an output shaft 54 connected to a valve shaft is engaged with a pin 56 fixed to a piston rod 52, and the reciprocating motion of the piston rod 52 causes the Scotch yoke 55 to swing. As a result, the reciprocating motion of the piston rod 52 is converted into the rotational motion of the output shaft 54, that is, the valve shaft inserted into the valve box 57,
The valve body 58 attached to the valve shaft is opened and closed.
A port 59a connected to a circuit for liquid such as oil is provided at the end of the main cylinder 49, and the sub cylinder 5
A port 59b connected to a gas circuit including a receiver tank that stores gas such as air and a gas supply pipe to the receiver tank is provided at the end of 0, and the piston rod 52 is a port of the main cylinder. It advances by the pressure of the liquid sent from 59a. When the pressure in the main cylinder 49 is removed, the pressure of the gas in the sub cylinder 50 becomes higher, and the piston rod 52 is pushed out of the sub cylinder 50 and retracts. In this way
The valve shaft rotates in both directions, and the valve element 58 is opened and closed.

[0004]

However, in the butterfly valve using the above-mentioned hydraulic type opening / closing device, the valve body, the hydraulic unit and the control panel are separately arranged, and the valve device as a whole is large, so that the installation area is small. It is difficult to secure, and the manufacturing cost becomes high. In addition, there are many hydraulic pipes between each device, which may cause oil leakage from the pipe joints. Further, it is necessary to separate the hydraulic unit and the control panel from the valve body and reassemble them at the installation site during transportation from the manufacturing plant to the installation site, which is a troublesome work.

On the other hand, in the method disclosed in Japanese Unexamined Patent Publication No. 10-220413, the hydraulic pump forming the liquid circuit, the motor for driving the hydraulic pump, and the oil tank are separate from the valve body and the valve drive device. , The hydraulic unit does not take a unified form, and a receiver tank for gas to be supplied to the sub-cylinder is also required, so that the installation area becomes large and the manufacturing cost becomes high, as in the case of the butterfly valve described above. There's a problem.

Therefore, an object of the present invention is to provide a rotary valve device which simplifies and functionally arranges the device, saves the installation area and manufacturing cost, and prevents the occurrence of troubles such as oil leakage. is there.

[0007]

In order to solve the above problems, the present invention adopts the following configuration.

That is, a rotary valve having a valve body rotatably mounted inside a valve box, a hydraulic cylinder rotatably connected to a valve shaft, and a linear movement of a piston rod of the valve body cause the valve body to move. In a rotary valve device consisting of a hydraulic unit that drives the hydraulic cylinder to open and close
The hydraulic unit includes a hydraulic pump, a drive motor for the hydraulic pump, a hydraulic control valve, and a hydraulic tank. The hydraulic unit is attached to the cylinder casing of the hydraulic cylinder and integrated with the hydraulic cylinder.

As described above, by integrating the hydraulic cylinder and the hydraulic unit, the entire apparatus can be made compact, and the piping between the hydraulic unit and the hydraulic cylinder and between each device of the hydraulic unit can be eliminated or significantly reduced. , Troubles such as oil leaks can be avoided, and the installation area can be saved.

In such a structure, the hydraulic pump can be provided in the head block of the cylinder casing, and the hydraulic tank can be provided in the outer peripheral portion of the cylinder casing.

According to this structure, since the head block can be used as a casing of the hydraulic pump, it is possible to form a flow path in the head block that allows the movable portion of the hydraulic pump to efficiently suck and discharge hydraulic oil. Further, since the oil tank is provided on the outer peripheral portion of the cylinder casing, the device can be easily integrated and becomes functional.

It is desirable that the hydraulic cylinder is swingably supported by the valve box.

In the process of rotating the valve shaft by advancing or retracting the piston rod of the hydraulic cylinder, the tip end of the piston rod draws an arcuate locus, so that the hydraulic cylinder is swingably supported on the valve box. With this, the valve shaft can be smoothly rotated and the valve body can be opened and closed.

The control panel of the hydraulic unit may be provided integrally with the cylinder casing of the hydraulic cylinder. By doing so, the electric wiring between the control panel and each device of the integrated hydraulic unit can be shortened, and thus the wiring work and maintenance are simplified.

It is desirable that oil passages from the hydraulic tank to the hydraulic pump be provided from both sides of the hydraulic cylinder on the head block side and the piston rod side.

As described above, if the oil flow path to the hydraulic pump is provided in two ways, from the head block side end of the hydraulic cylinder and from the piston rod side end, the hydraulic cylinder can be moved vertically. Alternatively, if the oil is installed in an oblique direction, even if the oil is deviated in the oil tank, the oil is supplied to the hydraulic pump without any trouble.

A deceleration control circuit for decelerating the valve closing speed of the valve body may be provided in the hydraulic circuit of the hydraulic unit.

In this way, when abnormality detection or repair is required, the valve body is not closed suddenly and the pipeline is not shut off, and the valve body is closed before the full-closed state. The valve speed, that is, the advancing speed of the piston rod of the hydraulic cylinder can be reduced, and the rotational speed of the valve element can be slowed to a fully closed state. Thereby, the water hammer effect (water hammer) can be prevented.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A rotary valve device according to an embodiment of the present invention will be described below with reference to the attached FIGS.

In the rotary valve device 1 of the first embodiment shown in FIGS. 1 (a) and 1 (b), a valve shaft 4 is inserted through a valve casing 3 of a valve body 2 and a valve body 5 is provided. Is a butterfly valve that is one of the rotary valves attached to the valve shaft 4, and a hydraulic cylinder 11 that is connected to the valve shaft 4 via a lever 6 coaxially with the valve shaft 4 so as to be rotatable. A hydraulic unit 14 that drives the hydraulic cylinder 11 to open and close the valve body 5 by the linear movement of the piston rod 12.

A bracket 7 is fitted and fixed to the valve shaft 4 in the valve box 3, and a holder 8 is fixed to the opposite side of the bracket 7 from the valve shaft 4. An opening degree scale 9 indicating the valve opening degree is provided on the lower side of the valve shaft 4 of the bracket 7 in the figure, and the valve opening degree is displayed by a pointer 10 attached to the valve shaft 4. Water pipes 60a and 60b are connected to the openings at both ends of the valve box 3, and when the valve body 5 is open, water flows through the water pipe.

A tip end of a hydraulic cylinder 11 for opening and closing the valve body 5 integrally provided with an oil tank 15 is pin-connected to the holder 8 and is swingably held by the valve box 3 so that the hydraulic cylinder 11 can be rotated. The tip of the piston rod 12 is pin-connected to the lever 6, and the reciprocating movement of the piston rod 12 causes the hydraulic cylinder 1 to move.
While swinging 1, the valve shaft 4 is rotated to open and close the valve body 5.

The hydraulic unit 14 has the structure shown in FIG.
As shown in FIG. 5, the hydraulic cylinder 11, an oil tank 15 having a sealed oil supply port 15a provided all around the outer circumference of the cylinder casing 11a, and a hydraulic pump 17 built in a head block 16 of the hydraulic cylinder 11 are shown.
And a motor 18 directly connected to the hydraulic pump 17, and a hydraulic control valve group 1 provided close to the head block 16.
9 and a control panel 20 for operating a hydraulic circuit provided on the outer peripheral wall of the oil tank 15. An oil chamber oil passage 21 on the piston rod 12 side, which serves as an oil passage between the hydraulic control valve group 19 and the oil chamber 11b on the piston rod 12 side of the hydraulic cylinder 11, is provided outside the oil tank 15. Other than the above, the head block 1 is used without using piping between each device of the hydraulic unit 14.
It is connected by the oil flow path formed in 6. The oil chamber oil passage 21 may be provided by inserting a pipe-shaped oil chamber oil passage pipe into the oil tank 15. The arrow in the figure indicates the flow of oil when the piston rod 12 moves forward.

FIG. 3 shows the hydraulic circuit of the above embodiment,
4A shows the oil flow when the piston rod 12 moves forward, that is, when the valve body 5 closes, and FIG. 4B shows when the piston rod 12 moves backward, that is, when the valve body 5 opens. It shows the flow of oil over time. FIG. 4 (a),
In (b), the arrow indicates the direction of oil flow.

In FIG. 3, the hydraulic cylinder 11 is a double-acting cylinder having oil supply ports provided in both the oil chamber 11b on the piston rod 12 side and the oil chamber 11c on the piston 13 side. The four-port three-position solenoid valve 22 and the flow control valves 23 and 24 are connected to the two ports, and the piston rod 12 is moved forward or backward by switching the flow path by the solenoid valve 22 to move the valve body. The opening and closing operation of 5 can be performed.

When the valve body 5 of the butterfly valve shown in FIGS. 1 (a) and 1 (b) is fully opened, the control panel 20 is opened.
When the electromagnetic valve 22 is switched by operating the button to connect the flow path from the hydraulic pump 17 to the flow rate adjusting valve 24 and the flow path from the flow rate adjusting valve 23 to the oil tank 15 to each other, as shown in FIG. As shown, the hydraulic pump 17 passes from the oil tank 15 through the tank-pump oil passage 25.
From the outlet 27 through the discharge oil passage 28 and the oil passage 29 for the oil chamber on the piston 13 side into the oil chamber 11c on the piston 13 side. Then, the piston 13 is pressed by the inflowing oil, and the oil in the oil chamber 11b on the piston rod 12 side of the hydraulic cylinder 11 is returned from the oil chamber oil passage 21 to the oil tank 15 via the return oil passage 30. Return. Due to this oil flow, the piston rod 12 moves forward, the valve shaft 4 is rotated clockwise via the lever 6, the piston rod 12 is projected for the entire stroke, and the valve body 5 is closed.

After closing the valve body 5, the control panel 20
4 is operated by switching the solenoid valve 22 shown in FIG. 3 to make the flow path between the hydraulic pump 17 and the flow rate adjusting valve 23 and the flow path between the flow rate adjusting valve 24 and the oil tank 15 communicate with each other. As shown in b), the hydraulic pump 17 passes from the oil tank 15 through the tank-pump oil passage 25.
From the discharge port 27 through the discharge oil flow passage 28 and the oil chamber oil flow passage 21 into the oil chamber 11b on the piston rod side. Then, the piston 13 is pressed by the inflowing oil, and the oil in the oil chamber 11c on the piston 13 side of the hydraulic cylinder 11 returns from the oil chamber oil flow path 29 and passes through the oil flow path 30 to the oil tank 15
Return to. Due to this oil flow, the piston rod 12 retracts, the valve shaft 4 is rotated counterclockwise via the lever 6, the entire stroke of the piston rod 12 is retracted, and the valve body 5 is fully opened. A limit switch (not shown) attached to the bracket 7 is operated at the full stroke retracted position of the piston rod 12 to stop the motor 18 of the hydraulic pump 17.

Since the forward or backward speed of the piston rod 12, that is, the opening / closing speed of the valve element 5, the flow rate of oil can be controlled by the flow rate adjusting valve 23 or 24 on the outlet side of the oil chamber 11b or the oil chamber 11c, Even if the load fluctuates during the valve closing or valve opening process, the speed of the piston rod 12 can be stably controlled. Further, in order to prevent the water hammer effect (water hammer) that occurs when the valve body 5 is closed rapidly, a limit switch for detecting the intermediate position of the piston rod 12 is provided on the bracket 7, and this detection signal causes
The flow rate adjusting valve 23 is throttled to variably reduce the oil flow rate flowing out from the oil chamber 11b on the piston 12 side by an electric signal to reduce the forward speed of the piston rod 12 to reduce the valve body 5
It is also possible to slow the valve closing speed of.

In the flow rate adjusting process, the oil discharged by the flow rate adjusting valves 23 and 24 is returned to the suction port 26 side of the hydraulic pump 17 by the return oil passage 31 provided in the head block 16.

As described above, since the hydraulic unit 14 is integrally provided on the hydraulic cylinder 11, the apparatus can be made compact, the installation area can be saved, and the electric wiring can be simple and easy. Then, the oil passage is connected to the cylinder casing 11a.
Since it is provided inside, the number of pipe joints is significantly reduced and troubles such as oil leakage can be prevented.

FIG. 5 shows a hydraulic circuit of another embodiment of the rotary valve device 1, which is fixed to the cylinder casing 11a in a space 32 formed axially inside the piston rod 12a and has a central portion. Oil passage 33a penetrating the
The small-diameter rod 33 provided therein is incorporated, the oil chamber 34 is formed, and the hydraulic cylinder 11 is a two-stage cylinder.

By switching the control valves shown in the figure, the oil chamber 3 is passed from the hydraulic pump 17 through the oil passage 33a.
Oil flows into the cylinder 4, and the piston rod 12a is advanced. When the piston rod 12a actuates a limit switch provided at a predetermined intermediate position, the control signal is switched by the detection signal, oil is sent to the oil chamber 11c on the piston 13 side, and the piston 13 is pressed. Then
The piston rod 12a is continuously advanced to project its full stroke, and the valve body 5 is fully closed. During the forward movement of the piston rod 12a, the counterbalance valve 39 keeps the pressure on the oil chamber 11b side constant and balances the load on the piston rod 12a. The speed is obtained, and it is particularly effective when the hydraulic cylinder 11 is vertically arranged.

On the other hand, in order to change from the valve closed state to the valve opened state, the control valve is switched to feed the oil into the oil chamber 11b on the piston rod 12 side of the hydraulic cylinder 11 to press the piston 13. And the oil chamber 1 on the piston 13 side
Oil returns to the oil tank 15 from 1c. And
The entire stroke of the protruding piston rod 12a is retracted, the valve body 5 is opened, and a limit switch (not shown) is operated to stop the motor 18 of the hydraulic pump 17.

With this arrangement, when the valve closing operation of the valve element 5 is started, oil is fed into the oil chamber 34 in the piston rod 12a, the piston rod 12a quickly advances, and the valve element 5 begins to rotate. After that, by switching the flow path, oil is sent into the oil chamber 11c on the piston 13 side of the hydraulic cylinder 11, the piston rod 12a moves forward with a larger acting force, and the rotation resistance becomes larger. Even in the vicinity, the valve body 5 can be smoothly brought into the fully closed state.

FIGS. 6 (a) and 6 (b) show a rotary valve device 1a according to a second embodiment, in which a ball valve is used as the rotary valve, which is different from the case of the butterfly valve described above. Similarly, the hydraulic unit 11 is attached to the hydraulic cylinder 11.
The valve cylinder 4 is rotated while the hydraulic cylinder 11 is swung by the forward or backward movement of the piston rod 12, so that the ball-shaped valve element 5 can be opened and closed.

FIGS. 7 (a) and 7 (b) show a rotary valve device 1b of the third embodiment, in which an arm 6a which rotates in conjunction with the valve shaft 4 is provided integrally with the lever 6. 1 is different from the rotary valve device 1 shown in FIGS. 1 (a) and 1 (b) in that a weight 6b for closing the valve body by its own weight is attached to its tip. 8 shows an example of the hydraulic circuit of the rotary valve device 1b, FIG. 9 schematically shows the operation of the piston rod 12, and FIG.
Of the oil flow when the valve body 5 is closed, that is, when the valve body 5 is closed.
FIG. 10B shows the oil flow when the piston rod 12 is retracted, that is, when the valve body 5 is opened.

In FIG. 9, the vertical axis represents the piston rod 12
The horizontal axis represents time, the symbols A and E represent the time when the valve body 5 is fully opened, B and C represent the time when the speed of the piston rod 12 is switched, and D the time when the valve body 2 is fully closed. Figure 10
In (a) and (b), the arrow indicates the direction of oil flow.

In FIG. 8, a hydraulic cylinder 11 is a single-acting cylinder in which an oil supply port is provided only toward the oil chamber 11b on the piston rod 12 side, and a small diameter of length L is provided at the tip of the oil chamber 11b. The cylinder portion 11s is formed,
The piston rod 12 has the weight 6 for automatic valve closing.
A forward force due to the weight of b acts. Piston 13
A small-diameter piston portion 13s, which has the same length L as the small-diameter cylinder portion 11s and is fitted therein, is formed in the. The electromagnetic valve 35a and the logic valve 39a form a locking circuit for holding the valve body 5 in the open state, and the electromagnetic valve 36
The first deceleration control circuit capable of decelerating the forward speed of the piston rod 12 by the a and the flow rate adjusting valves 37a and 38a communicates with the small diameter cylinder portion 11s, the small diameter piston portion 13s, and the piston rod side oil chamber 11b. Flow rate adjustment valve 38b
And form a second deceleration control circuit. The flow rate adjusting valve 38a has a smaller set flow rate than the flow rate adjusting valve 37a, and the flow rate adjusting valve 38b further reduces the set flow rate in order to close the valve body 5 at a required final speed. . The hydraulic circuit is a differential circuit that allows the oil discharged from one oil chamber to flow into the other oil chamber as the piston rod 12 moves.

When the solenoid valve 35a is energized and the flow path of the logic valve 39a is switched by operating the button of the control panel 1 in the fully open state of the valve body 5 shown in FIGS. 7 (a) and 7 (b), the piston rod The lock holding 12 at the fully open position of the valve body 5 is released. When this lock is released, the piston rod 12 receives a force in the forward direction by the weight 6b for automatic valve closing, so that the oil chamber 11b on the piston rod 12 side is not required to operate even if the hydraulic pump 17 is not activated. The oil flows, and as shown in FIG.
The oil chamber 11c on the piston 13 side passes from the oil chamber oil passage 21 through the oil injection passage 29 provided in the head block 16.
And the piston 13 starts to move forward together with the piston rod 12. Then, the weight 6b rotates the valve shaft 4 in the valve closing direction of the valve body 5 via the arm 6a by its own weight, and the piston rod 12 connected to the valve shaft 4 via the lever 6 continues to move forward (Fig. 9, between A and B).

At this time, in order to prevent the above-mentioned water hammer effect (water hammer) caused by the valve body 5 being rapidly closed, the valve body 5 is placed on the bracket 7 before the valve is closed. By providing the limit switch at a required position, it is possible to detect the intermediate forward position of the piston rod 12, that is, the intermediate opening / closing degree of the valve body 5, and the detection signal causes the flow path of the solenoid valve 36a to flow. 38a to reduce the flow rate of oil flowing into the oil chamber 11c on the piston 13 side.
Slow forward speed of 2 (between B and C in FIG. 9).

The small-diameter piston portion 1 of the piston 13
When the tip of 3s reaches the small-diameter cylinder portion 11s of the oil chamber 11b on the piston rod 12 side, the oil flowing from the small-diameter cylinder portion 11s to the oil chamber oil passage 21 is blocked,
Since the oil from the oil chamber 11b flows out to the flow path 21 through the flow rate adjustment valve 38b, the forward speed of the piston rod 12 is further reduced and the valve is closed (FIG. 9, C to D). The position of deceleration to the final forward speed can be made different depending on the length L of the small diameter cylinder portion 11s and the small diameter piston portion 13s.

As described above, since the first speed reducing circuit and the second speed reducing circuit are incorporated in the hydraulic circuit, the rotational speed of the valve element can be slowed down to a fully closed state. It is possible to prevent the hammering action (water hammer).
The deceleration circuit may be either the first deceleration circuit or the second deceleration circuit.

By the forward movement of the piston rod 12,
The total volume of the hydraulic cylinder 11 is the cylinder casing 1
Since the volume of the piston rod 12 protruding from 1a is increased, the amount of oil is insufficient only by moving the oil discharged from the oil chamber 11b on the piston rod 12 side to the oil chamber 11c on the piston 13 side. This shortage oil passes from the oil tank 15 to the tank-pump oil passage 25 and the oil chamber oil passage 29a on the piston 13 side shown in FIG.
Flow into.

Next, in order to return the valve body 5 from the fully closed state to the fully opened state, the solenoid valve 35a is de-energized by operating the button of the control panel 20, and the logic valve 39a is locked. The motor 18 is started to operate the hydraulic pump 17. As shown in FIG. 10B, when the hydraulic pump 17 incorporated in the head block 16 is operated, oil is discharged from the discharge port 27, and the oil for the oil chamber is discharged from the discharge oil flow passage 28 provided in the head block 16. It flows through the oil passage 21 into the oil chamber 11b on the piston rod 12 side. Then, the piston 13 is pressed by the inflowing oil, and the piston rod 12 retracts. At this time, the retreat speed of the piston rod 12 is adjusted by adjusting the flow rate adjusting valve 38c (FIG. 9, between D and E).

Due to the retraction of the piston rod 12, the oil filled in the oil chamber 11c on the piston 13 side is
The suction port 2 of the hydraulic pump 17 is pushed by the piston 13 and passes through the oil chamber oil passage 29a on the piston 13 side.
It is sent to the 6 side. Most of the oil discharged from the oil passage 29a for the oil chamber is the hydraulic pump 17 and the discharge oil passage 2.
8, through the oil chamber oil passage 21 on the piston rod 12 side, and flows into the oil chamber 11b on the piston rod 12 side.

In the process of retracting the piston rod 12,
The total volume of the hydraulic cylinder 11 is the cylinder casing 1
Since the volume of the piston rod 12 moving into the inside 1a becomes smaller, a part of the oil discharged from the oil chamber 11c on the piston 13 side is a tank formed in the head block 16.
It is returned into the oil tank 15 through the oil passage 25 between pumps.

Incidentally, the oil discharged by the flow rate adjusting valves 37a, 38a in the retreating process of the piston rod 12 is returned to the suction port 26 side of the hydraulic pump 17 by the return oil flow passage 31 provided in the head block 16. Be done.

In this way, the cylinder rod 12
By the backward movement of the valve shaft 4, the valve shaft 4 rotates in the valve opening direction of the valve body 5, and at the same time, the arm 6a rotates to move the weight 6b.
Returns to the initial position, and the valve body 5 is fully opened. When the turning position of the arm corresponding to the full opening of the valve body 5, that is, the retracted position of the piston rod 12 is detected by a limit switch (not shown), the hydraulic pump 17 is stopped. Since the oil passage in the oil chamber 11b on the piston rod 12 side is blocked by the solenoid valve 35a and the logic valve 39a, the required pressure in the oil passage is maintained even if the hydraulic pump 17 is stopped. The fully opened state of the valve body 5 is maintained. Further, in the unlikely event that an oil leak occurs in the hydraulic control valve group 19 and the required pressure cannot be maintained, the hydraulic pump 17 is automatically activated so that the hydraulic pressure can be returned to the required pressure. It is also possible.

As described above, by attaching the weight 6b to the arm 6a provided on the valve shaft 4 so as to rotate in conjunction therewith, the piston rod 12 can be moved forward by the weight of the weight 6b. like,
A single-acting cylinder with a relatively simple structure can be used. Since the hydraulic circuit has a locking function of holding the valve body 5 in a fully opened state and an opening / closing function of opening the closed valve body, the opening / closing device for the valve body and the opening / closing device and the valve shaft are An on / off mechanism such as a clutch for connecting and disconnecting,
Further, a locking device such as an electromagnetic brake for holding the valve element in a fully opened state is not required, which simplifies the device and contributes to a reduction in manufacturing cost.

The hydraulic cylinder 11 may be either the double-acting cylinder shown in FIG. 3 or the single-acting cylinder shown in FIG. 8, as shown in FIG. 1, FIG. 6 or FIG.
Besides being mounted horizontally, it can be mounted vertically or diagonally. When the hydraulic cylinder 11 is mounted in a direction other than the horizontal direction, the oil is biased in the oil tank 15, so the flow path of the oil to the hydraulic pump 17 is changed from the end of the oil tank 15 on the piston 13 side to the hydraulic pump 17. The tank-pump flow path 25 (FIG. 4,
(See FIG. 10), in addition to the double-acting cylinder of FIG.
As shown in an example, it is desirable to provide a flow path 25a from the end of the oil tank 15 on the piston rod 12 side to the hydraulic pump 17. This cylinder casing 11a
It can be provided either internally or by a bypass pipe.

[0051]

As described above, according to the present invention, a hydraulic pump and a hydraulic control valve are provided in a cylinder casing of a hydraulic cylinder that opens and closes a valve body by rotating a valve shaft of a rotary valve such as a butterfly valve and a ball valve. Since the hydraulic units such as the oil tank and the control panel are integrally provided, the entire apparatus can be made compact. This makes it possible to save the installation area and reduce the manufacturing cost.

Further, since the oil passage is provided in the cylinder casing, the oil tank, the hydraulic pump, the hydraulic control valve, and the piping between the hydraulic cylinders can be substantially omitted, and troubles such as oil leakage can be prevented.

Furthermore, since the electric parts are concentrated in one place and the control panel is provided in the vicinity, the electric wiring is simple and short, and the wiring work and maintenance are easy.

When the weight of the weight is used to close the valve element, a lock device for holding the valve element in a fully opened state, a valve element opening / closing device, etc. are not required, which simplifies the device and reduces the manufacturing cost. Contribute to the reduction of

[Brief description of drawings]

FIG. 1 (a) is a front view of a rotary valve device according to a first embodiment of the present invention.

FIG. 1B is a plan view of the above.

FIG. 2 is a vertical sectional front view of the hydraulic cylinder and the hydraulic unit.

FIG. 3 is a diagram showing an example of the hydraulic circuit of the same.

FIG. 4 (a) is an explanatory view showing an oil flow when the above piston rod moves forward, and (b) is an explanatory view showing an oil flow when the above piston rod moves backward.

FIG. 5 is a diagram showing a hydraulic circuit of another embodiment of the above rotary valve device.

FIG. 6 (a) is a front view of a rotary valve device according to a second embodiment.

FIG. 6B is a plan view of the above.

FIG. 7 (a) is a front view of a rotary valve device according to a third embodiment.

FIG. 7B is a plan view of the above.

FIG. 8 is a diagram showing an example of the hydraulic circuit of the above.

FIG. 9 is a view showing the operation of the piston rod of the above.

FIG. 10 (a) is an explanatory view showing a flow of oil when the piston rod of the same is advanced, and FIG. 10 (b) is an explanatory view showing a flow of oil when the piston rod of the same is retracted.

FIG. 11 is a front view of a conventional rotary valve device.

FIG. 12 is a vertical sectional front view of a conventional rotary valve drive device.

[Explanation of symbols]

1, 1a, 1b Rotary valve device 2 Valve body 3 Valve box 4 Valve shaft 5 Valve body 6 Lever 6a Arm 6b Weight 7 Bracket 8 Holder 9 Opening scale 10 Pointer 11 Hydraulic cylinder 11a Cylinder casing 11b, 11c Oil chamber 11s Small diameter cylinder Part 12, 12a Piston rod 13 Piston 13s Small diameter piston part 14 Hydraulic unit 15 Oil tank 15a Oil supply port 16 Head block 17 Hydraulic pump 18 Motor 19 Hydraulic control valve group 20 Control panel 21 Oil chamber oil flow path 22 Solenoid valve 23, 24 Flow rate adjusting valve 25, 25a Tank-pump oil flow path 26 Suction port 27 Discharge port 28 Discharge oil flow path 29, 29a Oil chamber oil flow path 30, 31 Return oil flow path 32 Space 33 Small diameter rod 33a Oil flow path 34 Oil chamber 35, 36, 35a, 36a Valves 37, 38, 37a, 38a, 38b, 38c Flow rate adjusting valve 39 Counterbalance valve 39a Logic valve 40, 40a Check valve 41 Valve body 42 Valve box 43 Valve shaft 44 Valve body 45 Hydraulic cylinder 46 Piston rod 47 Hydraulic unit 48 Control panel 49 Main cylinder 50 Sub cylinder 51 Motion conversion mechanism 52 Piston rod 53 Piston 54 Output shaft 55 Scotch yoke 56 Pin 57 Valve box 58 Valve body 59a, 59b Port 60a, 60b Water pipe

Continued front page    (72) Inventor Koji Okawa             1-12-19 Kitahorie, Nishi-ku, Osaka City, Osaka Prefecture             Kurimoto Iron Works Co., Ltd. (72) Inventor Tomio Kubo             2-103 Honjo Nishi, Higashi-Osaka City, Osaka Prefecture             Shimadauchi (72) Inventor Yoshio Murao             1-1 1-1 Kitaeguchi, Higashiyodogawa-ku, Osaka-shi, Osaka             No. Taiyo Iron Works Co., Ltd. (72) Inventor Katsuaki Kamei             1-1 1-1 Kitaeguchi, Higashiyodogawa-ku, Osaka-shi, Osaka             No. Taiyo Iron Works Co., Ltd. F-term (reference) 3H056 AA04 AA10 BB02 BB12 BB32                       BB38 BB50 CB02 CB03 CC05                       CC06 CD02 CE03 DD02 DD03                       DD05 DD08 EE08 GG05                 3H081 AA03 BB02 CC12 CC21 CC23                       DD24 DD26 DD28 DD33 DD36                       DD37 HH05

Claims (5)

[Claims] 1. A valve body in which a valve body is rotatably mounted inside a valve box, a hydraulic cylinder in which a piston rod is connected to a valve shaft of the valve body so as to be rotatable, and the hydraulic cylinder. In the rotary valve device including a hydraulic unit that drives a hydraulic pump, the hydraulic unit includes a hydraulic pump, a drive motor for the hydraulic pump, a hydraulic control valve, and a hydraulic tank, and the hydraulic unit is attached to a cylinder casing of the hydraulic cylinder. A rotary valve device integrated with the hydraulic cylinder. 2. The rotary valve device according to claim 1, wherein the hydraulic pump is provided in a head block of a cylinder casing, and the hydraulic tank is provided on an outer peripheral portion of the cylinder casing. 3. The rotary valve device according to claim 1, wherein the hydraulic cylinder is swingably supported by the valve box. 4. The oil flow path from the hydraulic tank to the hydraulic pump is provided from both sides of the head block side and the piston rod side of the hydraulic cylinder. The rotary valve device described. 5. The rotary valve device according to claim 1, wherein a control panel of the hydraulic unit is provided integrally with a cylinder casing of the hydraulic cylinder.