JP2554970B2 - Flow control pressure reducing valve device in piping - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides, for example, control of running water of a water pipe network, control of water supply amount and pressure to each floor of a high-rise building, control of a pipe network of a chemical plant, and the like. The present invention relates to a flow rate adjusting pressure-reducing valve device in a pipe capable of effectively adjusting flow rate and pressure in the pipe.

[0002]

2. Description of the Related Art Conventional flow control valves and pressure reducing valves of this kind are designed as valves having different structures and shapes.
A drive device for driving the valve body is formed outside the valve body, and as a drive source thereof, electricity, pneumatic pressure, repulsive force of a spring and the like are used to drive the valve body.

[0003]

However, since the drive device is formed outside the valve body, the external dimensions of the valve become large and the piping space becomes considerably large. If the power transmission equipment uses air pressure, an air compressor or the like is required, which makes the power source supply work and equipment difficult, and if the spring repulsion is used, the control within the range of the spring characteristics is required. Since the upper and lower limits of adjustment are narrowed, the error of the actual measurement value with respect to the target set value becomes large, and moreover, it is easily affected by the fluctuation of the power source that drives the valve body. It had such a problem.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been devised so as to solve such a problem, yet to operate effectively with less failure and to be suitably implemented. A piston is fixed to the upstream end of the rod inserted into the center of the small-diameter sheet formed in the middle of the piston, and a rod fixing block of the downstream end is fixed to the center of the pipe. At the downstream end of the cylinder in which the cylinder is fitted, a slidable frustoconical needle valve seat is fixedly mounted on the rod to pressurize one of the cylinders in which the piston is sandwiched and exhaust the other. The needle valve seat is configured so that the flow rate in the seat can be adjusted while the pressure is being applied.In addition, inside the rod, one chamber in the cylinder and the solenoid valve on the pressurizing side and the exhaust pressure side are provided. The flow path communicating with the solenoid valve and other Chamber and a flow path that communicates with the pressurizing side solenoid valve and the exhaust pressure side solenoid valve, or one chamber communicates with the upstream side pipe of the seat through the pressurizing side solenoid valve. In addition, the other chamber is connected to the low pressure part on the downstream side of the seat by communicating with the solenoid valve on the exhaust pressure side, and a flow sensor or pressure detection sensor is provided for adjusting the flow rate or reducing pressure. It is arranged at an upstream side or a downstream side where the inner diameter of the pipe is five times larger than the position of the sheet portion.

[0005]

Therefore, when the valve body is driven toward the upstream side or the downstream side by pressurizing one side in the cylinder and exhausting the other side simultaneously in the pipe, the needle valve seat is closed.
The flow rate of the fluid can be controlled by the degree of opening that occurs between the needle valve seat and the seat portion when the fluid pressure flows in the cylinder. It is introduced into one chamber or the other chamber, or the pressure is exhausted to drive the valve body, and the opening area between the needle valve seat and the seat is controlled by the operation of each solenoid valve or stop valve. It will be possible to make it vast and narrow down,
It is possible to control the flow rate adjustment decompression while detecting the flow rate on the upstream side and the pressure sensor on the downstream side and performing the calculation by the microcomputer section to control the switching of each solenoid valve.

[0006]

FIG. 1 is a cross-sectional view of a main part of an embodiment of the present invention, in which a truncated cone-shaped connecting short connecting from an upstream side to a downstream side is provided at an intermediate portion in a pipe which serves as a fluid flow path. A valve body composed of a pipe 1, a central outer pipe 2, a connecting short pipe 3 and a connecting short pipe 4 having a small-diameter seat portion 15 at an upstream end is interposed, and is fitted in the center of the small-diameter seat portion 15. At the upstream end of the rod 9 to be inserted, a piston 8 is fixed by a pressing nut 11, and a rod fixing block 12 fixed at the downstream end of the rod 9 is provided inside the connecting short pipes 3 and 4. A cylinder cover 7 which is fixed to the upstream side of the cylinder 5 slidably fitted to the piston 8 is fixed to the upstream side of the cylinder 5. At the downstream end of the cylinder 5, the rod 9 is slidably fitted to the front end. Small sheet - two frustoconical be fitted into the isolation portion 15 - fixedly dollars valve seat 14, the rod 9
Is a flow path c communicating with one chamber a in the cylinder 5.
And a double pipe structure having a flow path d communicating with the other chamber b in the cylinder 5.

Further, as shown in FIG. 1, the cylinder 5
A stabilizer 6 is provided on the outer periphery of the stop valve 16 in the conduit 22 that communicates with the upstream side portion of the central outer pipe 2 upstream of the sheet portion 15 and the flow path c in the rod 9. The Y-shaped strainer 17, the pressure gauge 27 with the damper 26, and the solenoid valve 19 on the pressurizing side are interposed, and the sheet portion 15 is provided.
Solenoid valves 20, 24 on the exhaust pressure side are provided in a conduit 23 communicating with the downstream low pressure part of the rod 9 and the flow path d in the rod 9, and a solenoid valve 18 on the pressurizing side is provided between the conduits 22 and 23. And the solenoid valve 21 on the exhaust pressure side are installed as separate systems,
A solenoid valve 25 is provided on the discharge side of the conduit 23 extending to the side groove 28, and a pressure gauge 27 with a damper 26 is provided at an intermediate portion of the conduit 23 near the solenoid valve 24. ,
Further, a flow rate sensor and a pressure sensor are provided in the pipe so that the flow rate sensor and the pressure sensor can be adjusted by controlling the microcomputer as shown in FIGS.

Therefore, when one of the chamber a and the other chamber b in the cylinder 5 is pressurized and the other is exhausted in a state where water flows in the direction of the arrow e in the pipe, the valve body is placed upstream or The needle valve seat 14 approaches and leaves the seat portion 15 while being driven toward the downstream side.
Although the flow rate of the fluid can be controlled by the degree of opening between the dollar valve seat 14 and the seat portion 15, the fluid flowing in the pipeline is stopped from the upstream side of the seat portion 15 by the stop valves 16, Y. The solenoid valves 18 and 19 are reached through the strainer 17 and the conduit 22, and when the valve body is driven to open, the solenoid valves 19, 20, 24 are turned on, and the solenoid valve 1
8, 21, and 25 are controlled to be off, respectively, so that the fluid in the conduit flows into the chamber a from the solenoid valve 19 while flowing through the passage c to be pressurized, and the fluid in the chamber b is electromagnetically induced from the passage d. Through the valve 20, the conduit 23, and the solenoid valve 24, the pressure is exhausted to the low pressure portion on the downstream side of the seat portion 15, and the valve element is driven toward the upstream side in the pipe as shown in FIG. As a result, the opening area of the needle valve seat 15 is increased while the needle valve seat 15 is separated from the seat portion 15.

When the valve body is driven to be closed, the solenoid valves 18, 21 and 24 are controlled to be on and the solenoid valves 19, 20 and 25 are controlled to be off, so that the fluid in the pipeline is controlled by the solenoid valve 18.
While flowing from the flow path d into the chamber b to pressurize, the fluid in the chamber a flows from the flow path c to the solenoid valve 21, the conduit 23,
The pressure is discharged to the low pressure portion on the downstream side of the seat portion 15 through the solenoid valve 24, and the valve element is driven toward the downstream side in the pipe as shown in FIG. As the seat 15 approaches the sheet portion 15, the opening area is narrowed.

The control of the flow rate control depressurization performed as described above uses the flow rate sensor for the flow rate detecting portion and the pressure sensor for detecting the pressure, and the detection position is a seal when the flow rate regulating valve is used. The flow rate sensor is provided at a position on the upstream side where the inner diameter of the conduit is five times as large as the position of the torso portion 15.
When used as a pressure reducing valve device, a pressure sensor is provided at a position downstream of the position of the sheet portion 5 times the inner diameter of the pipe line, and each sensor measures the actual flow rate or the actual pressure value. It is possible to continuously transmit the data to the microcomputer unit, calculate a correction value for a preset flow rate value or pressure value, and perform switching control of each solenoid valve 19, 20, 21, 24, 25.

The sensor unit and the microcomputer unit can be operated and controlled according to the flow charts shown in FIGS.

[0012]

As described above, according to the present invention, the drive unit of the valve body necessary for adjusting the flow rate or the pressure in the pipe is integrated with the valve body and disposed in the pipe. The external dimensions of the valve can be made compact so that the space does not become large, and the valve drive stroke
It becomes possible to lengthen the valve as needed to expand the adjustment range of the flow rate or pressure for effective control. Moreover, since the fluid flowing in the pipe is used as the drive source of the valve body, electricity, It is possible to control and operate effectively without being affected by fluctuations in power sources such as air pressure and springs, and without causing a failure. Also, because the device does not require a secondary power source As a result, it is possible to considerably reduce the work related matters and to reduce the number of valve failures, and it is possible to further improve the performance and accuracy of the flow rate control or the pressure control, and it is possible to preferably carry out the present invention.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a sectional view showing an operating state of the apparatus of FIG.

FIG. 3 is a block diagram showing a control circuit for both sensors.

FIG. 4 is a flowchart showing a control state of a microcomputer unit.

FIG. 5 is a flowchart showing a control circuit of a microcomputer unit. Explanation of symbols 5 Cylinder 8 Piston 9 Rod 14 Needle valve seat 15 Seat 16 Stop valve 17 Y-type strainer 18 Solenoid valve 19 Solenoid valve 20 Solenoid valve 21 Solenoid valve 24 Solenoid valve a chamber b chamber c Channel d channel

Claims (1)

(57) [Claims] 1. A piston 8 is fixedly installed at the upstream end of a rod 9 which is inserted into the center of a small-diameter seat portion 15 formed at an intermediate portion in a pipe that serves as a fluid flow path, and a downstream side is provided. A rod fixing block 12 is fixed to the end of the cylinder at the center of the pipe, and the rod 9 is slidably mounted on the downstream end of the cylinder 5 into which the piston 8 is fitted. It is assumed that the valve seat 14 is fixed, and the needle valve seat 14 approaches or leaves the seat portion 15 while pressurizing one of the cylinders 5 in which the piston 8 is sandwiched and discharging the other. A flow control pressure reducing valve device in a pipe, wherein a flow rate in the seat portion 15 is adjustable.