JPH0454383A - Control valve - Google Patents

Abstract

PURPOSE:To restrain enlargement of an overall structure by precisely adjusting pressure and flow rate of a flowin liquid by means of constituting the control valve in the title so that the flowing liquid flown in a valve box is divided and flown through in each of divided flowing liquid ports having a reduced opening area and each of the divided flowing liquid ports is individually opened and closed by each of divided valve bodies. CONSTITUTION:A partition wall 6 to divide an inflow chamber 14 communicated through to an inflow port 1a and an outflow chamber 15 communicated through to an outflow port b is formed in a valve box 1 having the inflow port 1a connected to an upstream side duct line and the outflow port 1b connected to a downstream side duct line. Two pairs of divided flowing liquid ports 9A, 9B provided in parallel concentrically and having an opening area divided from an opening area of the inflow port 1a are opened respectively against a pair of valve rods 5 driven and controlled by a control motor 4 and a pair of dividing valve bodies 16, 17 which synchronously open and close the pair of the divided flowing liquid ports 9A, 9B are respectively connected to both of these valve rods 5 on this partition wall 6. Consequently, it is possible to precisely adjust pressure and flow rate of the flowing liquid by way of restraining radical change of the pressure and the flow rate of the flowing liquid and simultaneously possible to secure a passing liquid area at the time of overall opening by way of restraining enlargement of an overall structure.

Description

[Detailed Description of the Invention] E Industrial Field of Application This invention is applicable to water distribution pipes such as water pipes, dealing with differences in demand between day and night, regional differences in supply and demand, and in high and low places. The present invention relates to a control valve installed for the purpose of standardizing the amount of water supplied, maintaining a constant water level in a water tank, managing the amount of water supplied when saving water, automatically shutting off pipes in an emergency, etc.

[Prior art] A large-diameter control valve that opens and closes a water port having a diameter approximately equal to the diameter (nominal diameter) of a pipe line using a valve body when controlling the pressure and flow rate of a flowing liquid by restricting the water flow port. Also used are multi-hole control valves that control the flow rate by moving a plate-shaped or cylindrical valve body having a large number of water flow holes to increase or decrease the degree of aperture.

[Problem to be solved by the invention] In the large-diameter control valve, the water inlet is opened and closed by a valve seat and a valve body having a diameter approximately equal to the aperture of the water inlet.
Precise control of pressure and flow rate is difficult, resulting in reduced water-stop performance and durability.In addition, in the multi-hole type control valve, the total open area of the valve body is only about 30% of the pipe area, resulting in pressure loss. In addition, if the total aperture area of the valve body is expanded to 100%, the structure of the entire valve mechanism becomes excessively large, resulting in high costs, and the main pipe is damaged due to insufficient flow. There were problems such as the valve not being able to be installed in roads, and the structure of the valve causing greater distortion in response to pressure, reducing watertightness.

An object of the present invention is to provide a control valve that eliminates the above-mentioned problems, allows precise control, and allows diversification of control systems.

Means for Solving the Problems] The control valve of the present invention includes a valve box having an inlet connected to an upstream pipe line and an outlet connected to a downstream pipe line. A partition wall is formed to divide the inflow chamber into an inflow chamber communicating with the inflow port and the outflow chamber communicated with the outflow port, and the partition walls are arranged concentrically in parallel to divide the opening area of the inflow port. At least one pair of split-flow ports having an opening area of 100 mm are opened facing a valve stem driven and controlled by an actuator, and the pair of split-flow ports are synchronously opened and closed on this valve stem. It has a configuration in which a pair of split valve bodies are connected.

[Function] At least one pair of divided flow ports having an opening area divided by the opening area of the inlet of the valve box are opened concentrically in the partition wall formed in the valve box to divide the pair of divided flow ports. The liquid flow ports are synchronously opened and closed by one pair of divided valve bodies connected to a valve stem driven and controlled by an actuator, and the pressure and flow rate of the liquid are individually adjusted at multiple locations within the valve box.

[Effects of the Invention] The present invention is configured as described above, so that the liquid flowing into the valve box is distributed and distributed through each divided flow port having a reduced opening area, and each divided flow liquid Since the ports are opened and closed individually by each split valve body, rapid changes in the pressure and flow rate of the flowing liquid can be suppressed and the pressure and flow rate of the flowing liquid can be precisely adjusted, and the overall structure can be made larger. It is possible to suppress this and secure the liquid passage area when fully opened.

In addition, each divided valve body is driven and controlled by an actuator to control the opening and closing of each divided flow liquid port, so the control valve can be incorporated into various control systems, such as constant control of downstream pressure, constant control of terminal pressure, This has the effect of economically performing various controls such as flow rate control and constant control of upstream water level and downstream water level.

Furthermore, the number of pairs of divided valve bodies and the driving manner of each pair of divided valve bodies can be changed according to the purpose, thereby making it possible to diversify the manner of controlling the pressure and flow rate of the fluid.

[Embodiment] Next, an embodiment in which the present invention is applied to a double control valve will be described with reference to FIGS. 1 and 2.

In a control valve V installed to control the pressure and flow rate of liquid flowing in a water distribution pipe, a valve box 1 having a substantially horizontal cylindrical shape connected in the middle of the water distribution pipe has a rotary motion. A pair of yokes 2, 2 each having a transmission mechanism 2a, 2a for converting the movement up and down is installed, and a control motor 4 such as a servo motor is attached to the right yoke 2, and the control motor 4 rotates the yoke. A speed reducer 3A to be driven is installed, and a motorized speed reducer 3A is mounted on the left yoke 2 by an input shaft connected to an output shaft of a control motor 4.
A speed reducer 3B is installed which is rotated in synchronization with the transmission mechanism 2a, and a pair of valve rods 5, 5 are installed vertically in parallel at the lower ends of both transmission mechanisms 2a and have their lower ends thrust into the valve box I. The upper ends are connected to each other.

At the left and right ends of the valve box 1, there is an inlet 1 connected to the upstream pipe line.
a and an outflow port 1b connected to the downstream pipe line are opened, and in the valve box l there are upper and lower horizontal parts 6a, 6a which are vertically spaced apart and formed horizontally, respectively, and a cross section. A curved part 6b formed in an arc shape and connected to the left end of the rain horizontal part 6a, and a pair of upper and lower parts connected in an inclined state to the right end of the rain horizontal part 6a and the upper and lower inner wall surfaces of the valve box 1, respectively. A partition wall 6 having inclined portions 6c, 6c is formed.

Inside the valve box 1, an inflow chamber 14 communicating with the inflow port 1a and an outflow chamber 15 communicating with the outflow port 1b are defined by a partition wall 6.

In the upper and lower horizontal parts 6a of the partition wall 6, two pairs of ring-shaped annular bodies 7A are arranged vertically and concentrically.

7B is attached to the partition wall 6, two pairs of upper and lower divided flow liquid ports 9A are arranged concentrically in parallel facing both the valve rods 5, and each have an opening area that is divided from the opening area of the inlet 1a. 9B is opened, and in this example, each divided flow liquid port 9A, 9
The opening area of B is set to about 1/4 of the opening area of the inlet 1a.

Lower valve seats 8A are formed horizontally around the outlet portion 9b of the upper divided flow port 9A on the upper end surfaces of both upper annular bodies 7A, and lower valve seats 8A are formed horizontally on the upper end faces of both upper annular bodies 7B. At the upper end edge of the inner circumferential surface, lower valve seats 8B are formed around the outlet of the upper divided flow port 9B and are concentric with the lower valve seats 8A.

A pair of compound valve mechanisms 12 and 12 are inserted into the valve body 1 and driven and controlled synchronously by the control motor 4 in order to open and close the two pairs of divided flow ports 9A and 9B all at once. The upper divided valve body 16 is attached to the lower end of the upper divided flow port 9A to open and close the upper divided flow port 9A, and the upper divided valve body 16 is connected to the upper divided valve body 16 via a hanging connecting rod 18 attached to the upper divided valve body 16. The upper divided valve body 17 opens and closes the upper divided flow port 9B.

In the upper divided valve body 16, a first valve body 20, which has a closed cylindrical shape and has a boss portion 20a projecting from the upper end, is connected to the lower end of the valve stem 5 via a mounting screw 23 screwed into the boss portion 20a. The first valve body 20 is attached to be movable up and down, and a cylindrical fitting part 21 having an inner diameter D2 larger than the inner diameter DI of the lower valve seat 8 is formed on the peripheral edge of the first valve body 20. At the lower end, a circumferential retaining edge 22 is formed that projects slightly inward.

The inner diameter D2 of the fitting part 21 is installed below the first valve body 20.
The second valve body 24 having an outer diameter equal to that is tightly fitted into the fitting portion 21 of the first valve body 20 so as to be slidable in the vertical direction.

This second valve body 24 is hooked to the outer peripheral edge or the locking edge 22, and sets the flow rate of the liquid flowing through the piston 25 coupled to the first valve body 2o and the upper divided flow liquid port 9A. In order to
1, and the second valve body 24 is biased toward the closing direction by a spring 29 fitted onto the lower end of the valve stem 5. A seal member 27 made of an elastic material and formed in the shape of a circular plate is attached to the lower surface of the piston 25.
The seal member 27 and the vane portion 26 are fastened to the piston 25 by a connecting rod 18 whose upper end is screwed into a threaded portion 25a protruding from the center of the lower surface of the piston 25.

On the lower surface of the sealing member 27, near the outer peripheral edge of the lower surface of the piston 25, a sealing surface 28 is formed in an annular shape that approaches and separates from the lower valve seat 8A, while on the vane portion 26 there is formed a sealing surface 28 that moves upwardly. In order to gradually increase the flow rate of the liquid flowing through the blade portion 26 as the flow rate increases, a plurality of grooves each having a substantially inverted V shape with a notch width gradually increasing from above to below are arranged at equal intervals in the circumferential direction. A notch 26a is recessed.

When a sealing surface 28 is separated from the lower valve seat 8A between the outer circumferential edge 25b of the upper surface of the piston 25 and the outer circumferential edge 20b of the lower surface of the lid portion of the first valve body 20, the second valve body 24 moves upwardly. A gap 30 is formed to allow movement of the first valve element 20, and an internal pressure valve chamber 31 sealed by a piston 25 is formed inside the first valve body 20.

A communication hole 32 that communicates the inside of the internal pressure valve chamber 31 with the inlet portion 9a of the upper divided flow port 9A is vertically provided in the second valve body 24. Pressure valve chamber 31
It is filled with liquid that has flowed into it.

When the valve stem 5 and the first valve body 20 move to the rising end, the second valve body 24 moves to the rising end together with the first valve body 20 with the gap 30 between it and the first valve body 2o reaching its maximum. Then, the seal surface 28 is displaced upward of the lower valve seat 8A, and the lower end of the vane portion 26 is fitted into the upper divided flow port 9A, and the flow area of the upper divided flow port 9A becomes maximum, and the valve stem 5 and the first valve body 2o
As the flow rate lowers, the relative position between the blade portion 26 and the upper divided flow port 9A changes, and the flow area of the upper divided flow port 9A gradually decreases.

When the valve stem 5 and the first valve body 20 move to the lower end and stop in response to a sensor command, the sealing surface 28 of the piston 25 comes into elastic contact with the lower valve seat 8A, and the piston 25 moves toward the anti-closing direction by the spring 29. The second
The valve body 24 is elastically displaced toward the opposite closing direction and temporarily stops, and a portion of the liquid in the internal pressure valve chamber 31 flows out through the communication hole 32 to the inlet portion 9a of the upper divided flow port 9A. When the second valve body 24 is pushed in the anti-closing direction and stopped, the liquid continues to rise until the liquid pressure in the internal pressure valve chamber 31 becomes equal to the liquid pressure on the inlet portion 9a side of the upper divided liquid flow port 9A. The liquid flows from the inlet portion 9a of the divided flow liquid port 9A into the internal pressure valve chamber 31 through the communication hole 32. piston 2
5, that is, the inner diameter D2 of the fitting portion 21 of the first valve body 20
is larger than the outer diameter of the vane 26, that is, the inner diameter DI of the valve seat 8, and the pressing area that pushes down the piston 25 is larger than the pressing area that pushes up the vane 26, so the hydraulic pressure that pushes down the piston 25 The piston 25 is automatically pushed in the closing direction by the differential pressure between the pressure and the hydraulic pressure pushing down the vane portion 26, and the sealing surface 28 is pressed against the valve seat 8 with a constant contact pressure.
The upper divided flow liquid port 9A is hermetically closed by the second valve body 24.

The lower end of the connecting rod 18 is inserted through the center of the upper divided valve body 17, and the lower part of the upper divided valve body 17 is supported by a support member 34 attached to the lower wall of the valve box 1 so as to be vertically slidable. and the upper end is the threaded part 18 at the lower end of the connecting rod 18.
It is fastened to the connecting rod 18 by a valve body retainer 35 screwed into the valve body a.

A sealing surface 17a that approaches and separates from the lower valve seat 8B is formed in an inclined shape on the outer circumferential surface of the upper end of the lower part of the upper divided valve body 1, and below the sealing surface 17a is a blade portion 26 of the second valve body 24. A blade portion 17b having a substantially equal shape is formed.

The upper divided valve body 17 is connected to the second valve body 24 of the upper divided valve body 16 via a connecting rod 18 so as to be able to move vertically together, and the upper and lower divided flow ports 9A and 9B are connected to the second valve body 24 and the upper divided valve body. It is opened and closed synchronously by the body 17.

The control motor 4 controls the rotation of the control motor 4 to rotate the valve box l.
It is connected to a control device that controls the pressure and flow rate of the fluid flowing through the control valve V, and this control device includes a pressure sensor that detects the pressure of the fluid in the downstream pipe line downstream of the control valve V.
A flow sensor detects the flow rate of liquid in the upstream pipe line upstream from the control valve V, and detects the differential pressure between the pressure of the liquid in the upstream pipe line and the pressure of the liquid in the upstream pipe line. A detection signal from a differential pressure sensor that detects the water level, a water level sensor that detects the water level in the water tank connected to the upstream pipe line or the downstream pipe line, and each divided flow liquid port 1.
Detection signals from opening sensors that detect the opening degrees of the openings 1A and 11B are inputted, and the output section of the control device issues an output signal based on these detection signals to control the rotation of the control motor 4.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, the valve box 1 has an inlet port 1a connected to the upstream pipe line and an outlet port 1b connected to the downstream pipe line. A partition wall 6 is formed to partition the chamber 14 and an outflow chamber 15 that communicates with the outflow port 1b. Two pairs of divided flow ports 9A and 9B are opened to face a pair of valve rods 5 that are driven and controlled by a control motor 4, respectively, and both valve rods 5 have a pair of divided flow ports 9A and 9B. A pair of split valve bodies 16 and 17 which open and close 9A and 9B synchronously are connected to each other.

Therefore, the liquid flowing into the valve box 1 is distributed and distributed through each of the divided flow ports 9A and 9B having a reduced opening area, and each divided flow port 9A and 9B is connected to each divided valve body 16. .17, the pressure and flow rate of the flowing liquid can be precisely adjusted by suppressing sudden changes in the pressure and flow rate of the flowing liquid, and it is also possible to prevent the overall structure from increasing in size and to open and close the flowing liquid individually. It is possible to secure the area through which liquid passes through.

When fully closed, the second valve seat 20 of the upper divided valve body I6 and the upper divided valve body 17 connected to the second valve body 20 or the upper and lower valve seats 8A of the upper and lower divided flow ports 9A and 9B.

Each divided flow liquid port 9A is connected to 8B with a constant contact pressure.
, 9B, the liquid-tight performance when fully closed can be improved.

Furthermore, since each divided valve body 16, 17 is driven and controlled by the control motor 4 to control the opening and closing of each divided flow liquid port 9A, 9B, the control valve V can be incorporated into various control systems, and the downstream pressure can be maintained constant. It has the effect of economically performing various controls such as constant control of terminal pressure, constant flow rate control, and constant control of upstream water level and downstream water level.

Furthermore, the number of pairs of divided valve bodies and the driving manner of each pair of divided valve bodies can be changed to suit the purpose, thereby making it possible to diversify the manner of controlling the pressure and flow rate of the fluid.

In the above embodiment, both valve rods 5 and the post-rain joint valve mechanism 12 are configured to be driven and controlled synchronously by a common control motor 4, or both valve stems 5 and the post-rain joint valve mechanism 12 are controlled over time by separate control motors. For example, when one of the combined valve mechanisms 12 moves upward to a position where the upper and lower divided flow ports 9A and 9B are fully opened, the other combined valve mechanism 12 starts moving upward. Good too.

Further, the after-rain joint mechanism 12 may be driven and controlled by another actuator such as an air cylinder or a hydraulic cylinder instead of the control motor 4.

Next, to explain another example of the control valve V, in the single control valve V shown in FIG. 3, a pair of upper and lower split flow ports 9A and 9B are opened in the partition wall 6A of the valve box IA, Inside the valve box IA are upper and lower ports 1 that synchronously open and close both side flow ports 9A and 9B.
A pair of split valve bodies 16° and 17 are inserted.

In the triple type control valve V shown in FIG. 4, three pairs of split flow ports 9A and 9B are opened in the partition wall 6B in the valve box IB, and are synchronized by a common control motor 4 in the valve box IB. Three pairs of divided valve bodies 16 are connected to three valve rods 5 which are driven by each other to synchronously open and close three pairs of divided flow ports 9A and 9B.
．． 1.7 is charged.

The 3-unit, 1-single-acting, 2-interlocking type control valve shown in FIG.
is opened, and inside the valve box IC are two pairs of valves connected to two valve rods 5 which are driven synchronously by one control motor 4A, and which simultaneously open and close two pairs of divided flow ports 9A and 9B. A pair of split flow liquid ports 9 are connected to the split valve bodies 16 and 17 and the valve stem 5 driven by the control motor 4B, respectively.
A.

A pair of split valve bodies 16 and 17 that open and close 9B synchronously are inserted.

In the quadruple type control valve V shown in FIG.
It is loaded inside.

In the results of a comparative test of the flow control characteristics of the control valve V described above and the flow control characteristics of conventional butterfly valves and gate valves, it was found that
In the flow control characteristic curve shown in the figure, a pair of split valve bodies 16,
Flow rate control characteristic curve A1 of a single control valve V having 17
and the flow rate control characteristic curve A2 (1
After moving the pair of split valve bodies 16 and 17 to the fully open position,
The flow rate control characteristic curve when the other pair of divided valve bodies 16 and 17 are moved to the fully open position) is the conventional flow rate control characteristic curve B2 of the no-tough fly valve and the flow rate control characteristic curve B1 of the gate valve.
Compared to the conventional control valve, the rising angle is gentler and changes more linearly at medium and low openings, and the control valve V of the present invention has superior flow control characteristics especially at medium and low openings compared to conventional control valves. It was found that it has.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention.
The figure is a partially cutaway side view of the control valve, Figure 2 is a half-open sectional view of the upper divided valve body, and Figures 3, 4, 5, and 6 are parts showing other examples of the control valve. FIG. 7 is a side view of the fractured side, and FIG. 7 is a flow control characteristic curve diagram. J... Valve box 1a... Inlet port 1b... Outlet port 4... Control motor 5... Valve rod 6... Partition wall 9A, 9B... Divided flow liquid port 16.17 ...Split valve body ■...Control valve

Claims (1)

[Claims] A valve box having an inlet connected to an upstream pipe line and an outlet connected to a downstream pipe line includes an inlet chamber communicating with the inlet, and an inlet chamber communicating with the outlet. forming a partition wall that partitions the outflow chamber into communication with the outflow chamber; and on the partition wall, at least one pair of split flow ports are arranged concentrically in parallel and have an opening area that divides the opening area of the inflow port; A control characterized in that a pair of split valve bodies are opened opposite to a valve stem driven and controlled by an actuator, and a pair of split valve bodies are connected to the valve stem for synchronously opening and closing the pair of split flow liquid ports. valve.