JPH06295209A - Fluid control valve - Google Patents

Abstract

PURPOSE:To provide the control valve which reacts instantaneously even to a quick change in primary pressure and keeps a secondary side flow rate and secondary pressure constant. CONSTITUTION:A valve body 11 consists of a rod part 12 in which one end has a larger diameter than that of the other end and a flow rate control part is provided on the side face, and a diaphragm 22 provided in a large diameter side end part of the rod part. A valve main body 31 consists of a valve chest 53 for fixing a peripheral edge of the diaphragm 22 and containing the valve body 11, pressure chambers 34, 44 partitioned from the valve chest 53 by the end face of the diaphragm 22 or the rod part 12, a controlled fluid passage 56 which is formed between the outside periphery of the rod part 12 and the inside wall surface of the valve chest 53, and has a flow rate control passage part 58, a controlled fluid inflow port 59 for communicating with the controlled fluid passage 56 on a small diameter end part side of the rod part 12, a controlled fluid outflow port 60 for communicating with the controlled fluid passage 56 on a large diameter end part side of the rod part, and pressurized gas inflow lines 33, 43 leading to the pressure chambers 34, 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve for controlling a flow rate and a secondary pressure (outflow side pressure) of a fluid composed of liquid or gas.

[0002]

2. Description of the Related Art Conventionally, when controlling a flow rate of a fluid whose primary pressure (inflow side pressure) fluctuates and a secondary pressure, a flow rate transmitter or pressure transmitter is provided in a part of a flow path and the flow rate is controlled. The valve is equipped with an electric motor or air motor that opens and closes the valve, and sends a signal related to the flow rate or pressure value sensed by the flow rate transmitter or pressure transmitter to the electric motor, etc., and the signal is used to drive the electric motor or air motor. I was controlling and opening and closing the valve.

However, in the above method, the opening and closing of the valve does not follow the rapid change in the primary pressure or the change such as pulsation, and the flow rate or the secondary pressure is controlled to a desired value. could not. Further, since the transmitter and the motor are used, the device is complicated and large-scaled, and the maintenance is not easy.

[0004]

Therefore, in view of the above points, the present invention instantaneously reacts to a rapid change or pulsation change of the primary pressure to keep the secondary flow rate and the secondary pressure constant. It is an object of the present invention to provide a control valve which can be easily maintained and has excellent durability, which has a simple structure without requiring a complicated and easy-to-break device such as an electric motor and a transmitter. .

[0005]

SUMMARY OF THE INVENTION The present invention comprises a valve body and a valve body, wherein the valve body has a cylindrical shape whose one end is enlarged to have a larger diameter than the other end, and the outer circumference of the side face between the both ends is increased. The valve body includes a rod portion having a protruding flow rate control portion, and a diaphragm provided at least at both ends of the rod portion on the large diameter side so as to project in a flange shape toward the outer periphery of the end portion. A valve chamber having a fixed peripheral edge and accommodating a valve body such that the rod portion is slidable in the axial direction; and a pressurizing chamber that is outside the valve chamber and is partitioned from the valve chamber by the small-diameter side end surface of the diaphragm or the rod portion. A controlled flow path passage portion formed between the outer circumference of the rod portion and the wall surface of the valve chamber, the distance between the flow control portion and the wall surface of the valve chamber becoming narrower as the rod portion slides toward the large-diameter end. Fluid passage and small diameter of the rod part Controlled fluid inlet that communicates with the controlled fluid passage on the side of the valve and that opens on the outer surface of the valve body, and controlled fluid flow that communicates with the controlled fluid passage on the large diameter end side of the rod that opens on the outer surface of the valve body. The present invention relates to a fluid control valve comprising an outlet and a pressurized gas inflow path communicating with the pressurizing chamber and opening on the outer surface of the valve body.

The diaphragm is composed of a first diaphragm provided at the large diameter end of the rod portion and a second diaphragm having a smaller diameter than the first diaphragm and provided at the small diameter end of the rod portion. The pressure chamber may be separated from the valve chamber by both diaphragms.

[0007]

The pressurized gas having a predetermined pressure flows into the pressurizing chamber to push the valve body from the outer surface side. On the other hand, the controlled fluid that has entered the controlled fluid passage from the controlled fluid inlet on the primary side passes through the flow rate control passage portion and then pushes the large-diameter side end portion of the rod portion outward, and then the secondary side fluid. It flows out of the valve body from the controlled fluid outlet.

When the primary flow rate and the pressure increase, the secondary side outflow amount and the secondary pressure increase once, and at the same time, the pressure applied to the large diameter side end of the rod portion from the inside to the outside also increases. To do. Therefore, the pressure applied from the inside to the large-diameter side end portion of the rod portion overcomes the pressure in the pressurizing chamber located outside the large-diameter side end portion, and the rod portion is pushed toward the large-diameter side end portion. Then, the diaphragm is deformed and the rod portion slides toward the end portion on the large diameter side, and the slide of the rod portion narrows the flow rate control passage portion and reduces the flow rate flowing through the controlled fluid passage. As a result, the flow rate flowing out from the controlled fluid outlet on the secondary side decreases, the secondary pressure decreases, and even if the flow rate and pressure on the primary side increase, the fluctuation is suppressed on the secondary side.

On the contrary, when the flow rate on the primary side decreases and the pressure decreases, the flow rate of the fluid flowing through the controlled fluid passage and the pressure decrease occur, and the pressure applied from the inside to the large diameter side end portion of the rod portion is increased. It becomes smaller than the pressure in the pressurizing chamber outside the large diameter end. As a result, the rod portion slides toward the small-diameter side end portion, widens the flow rate control passage portion, and increases the flow rate of the controlled fluid passage. As a result, the outflow amount from the controlled fluid outlet on the secondary side increases and the secondary pressure increases, so
Even if the flow rate and the pressure on the secondary side decrease, the fluctuation is suppressed on the secondary side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a longitudinal sectional view of a control valve according to an embodiment of the present invention, FIG. 2 is a perspective view of a valve element used in the embodiment, FIG. 3 is a partially enlarged sectional view for explaining the operation of the embodiment, and FIG. 5 is a longitudinal sectional view of another embodiment, FIG. 5 is a perspective view of a valve body used in that embodiment, FIG. 6 is a partially enlarged sectional view for explaining the operation of the embodiment, and FIG. 7 is a further embodiment. It is a principal part expanded sectional view.

The control valve 10 of the embodiment shown in FIGS. 1 to 3 comprises a valve body 11 and a valve body 31 in which the valve body is housed. As shown in FIGS. 1 and 2, the valve body 11 includes a rod portion 12 and a diaphragm 22. The rod portion 12 has a cylindrical shape in which the vertical cross-sectional shape is substantially "T" -shaped with the upper end 13 side having a larger diameter than the lower end 14 side, and the upper and lower two halves 15 and 16 are integrally combined by screwing. It will be done. On the lower end 14 side of the rod portion 12, a flow rate control portion 17 (shown in FIGS. 2 and 3) is formed in an annular protruding shape.

The diaphragm 22 is formed integrally with the rod portion 12 on the upper end portion of the rod portion 12. The diaphragm 22 projects like a brim on the outer periphery of the upper end of the rod portion 12, and the outer peripheral edge 23 thereof has a thick wall. The diaphragm 22 and the rod portion 12 are made of various kinds of rubber or resin, and among them, those made of fluororubber or fluororesin having high chemical resistance and corrosion resistance are preferable.

The valve body 31 has a cylindrical shape with a three-layer structure in which a third block 52 is sandwiched between a first block 32 and a second block 42 and is made of a resin such as a fluororesin having high corrosion resistance and chemical resistance. To be done. First block 32 and second
Pressurized gas inflow paths 33 and 43 and pressurizing chambers 34 and 44 are formed in the block 42. Pressurized gas inflow path 33,
43 has one end open at the outer surface of the valve body and the other end at the pressurizing chamber 3
It leads to 4,44. On the other hand, the pressurizing chambers 34 and 44 are
It is open at the mating surfaces 40 and 30 with the block 52.
The pressurizing chamber 34 of the first block has a diameter substantially equal to that of the diaphragm 22 excluding the outer peripheral edge 23, and the pressurizing chamber 44 of the second block has a diameter substantially equal to the outer diameter of the lower end 14 of the rod portion 12. Become. In addition, the pressurizing chamber 44 of the second block
A sealing ring 57 is fitted on the outer peripheral surface of the mating surface 30 with the third block 52.

The third block 52 constitutes an intermediate portion of the valve body 31, and has a valve chamber 5 penetrating therethrough in the center thereof.
3 is formed. The valve chamber 53 is formed of a through hole having a substantially "A" -shaped vertical cross-section with a thin intermediate portion, and is larger than the outer diameter of the rod portion 12. Valve chamber 53
The inner diameters of both ends are substantially equal to the inner diameter of the pressurizing chamber 34 of the first block 32, and a groove 55 is formed on the outer periphery of the valve chamber 53 on the mating surface with the first block 32.

The outer peripheral edge 23 of the diaphragm 22 is fitted in the groove 55 so that the valve element 11 is housed in the valve chamber 53, and then the blocks 32, 42 and 52 are combined and integrated. A controlled fluid passage 56 is formed between the outer peripheral surface of the rod portion 12 of the valve body 11 housed in the valve body 31 and the inner wall surface of the valve chamber 53. In the controlled fluid passage 56, a flow control passage portion 58 is formed between the controlled fluid passage 56 and the wall surface 54 (shown in FIG. 3) of the valve chamber facing the flow control portion 17 of the valve body rod portion 12. Further, the controlled fluid passage 56 is formed by the rod portion 1.
2 to the controlled fluid inflow port 59 on the small diameter end side,
On the other hand, the large diameter side end of the rod portion 12 communicates with the controlled fluid outlet 60.

The control valve 1 thus constructed
The controlled fluid inflow port 0 is connected to the controlled fluid inflow port 59 via a pipe to the controlled fluid supply source consisting of gas or liquid whose flow rate and pressure are to be controlled. Sent in. Further, gas pressurized to a constant pressure, for example, compressed air is blown from the pressurized gas inflow passages 33 and 43. The pressure of this pressurized gas is
It is determined by the secondary flow rate and pressure of the controlled fluid.

The pressurized gas reaches the pressurizing chambers 34, 44 and pushes the diaphragm 22 and the end surface on the small diameter side of the rod portion 12 from the outside. Further, the controlled fluid is the controlled fluid passage 56.
After passing through the inner fluid control passage portion 58 and pushing the large diameter side end portion of the rod portion 12 to the outside, it flows out of the control valve 10 from the controlled fluid outlet 60.

When the primary flow rate or pressure of the controlled fluid fluctuates, it operates as follows. First, the case where the flow rate or the primary pressure is increased will be described. In that case, the flow rate and the secondary pressure flowing out from the controlled fluid outlet 60 first increase.

However, at the same time, the pressure applied from the inside to the large diameter side end of the rod portion 12 also increases,
The pressure chamber 34 whose internal pressure is outside the large diameter side end of the rod portion
The rod portion 12 is pushed toward the end portion on the large diameter side by overcoming the pressure of. Then, the diaphragm 22 is deformed like a chain line and the rod portion 12 slides toward the end portion on the large diameter side, whereby the flow rate control passage portion 58 becomes narrow and the controlled fluid passage 5 is formed.
The flow rate through 6 decreases. As a result, the flow rate flowing out from the controlled fluid outlet 60 on the secondary side decreases, the secondary pressure decreases, and the flow rate and pressure fluctuation on the secondary side are suppressed.

On the other hand, when the primary flow rate and pressure decrease, the flow rate and secondary pressure flowing out from the controlled fluid outlet 60 decrease once. However, at the same time, the pressure applied from the inside to the large-diameter side end portion of the end portion of the rod portion 12 decreases and becomes lower than the pressure of the pressurizing chamber 34.
Is pushed toward the end on the small diameter side and slides. As a result, the flow rate control passage portion 58 becomes wider and the flow rate of the controlled fluid passage 56 increases. As a result, the flow rate flowing out from the controlled fluid outlet 60 on the secondary side increases, the secondary pressure increases, and the flow rate and pressure fluctuation on the secondary side are suppressed.

4 to 6 show another embodiment. In the control valve 70 of this embodiment, the valve body 71 has a first diaphragm 74 at the large diameter side end of the rod portion 72 and a second diaphragm 76 at the small diameter side end. In the figure, 78 is a valve body, 79 and 80 are pressurization chambers, 81 is a valve chamber, 82 is a flow rate control unit, 83 is a flow rate control passage unit, 84 is a controlled fluid passage, 85 and 86 are pressurized gas inflow passages, Reference numeral 87 is a controlled fluid inlet, and 88 is a controlled fluid outlet. In this embodiment, the valve chamber 81 and the pressurizing chambers 79 and 80 are partitioned by the first diaphragm 74 and the second diaphragm 76.

In each of the above-described embodiments, the pressurized gas inflow passages 43, 8 leading to the small diameter end side pressurizing chambers 44, 80 of the rod portion.
6 may be opened and the pressure in the pressurizing chambers 44 and 80 may be made equal to the atmospheric pressure. However, it is more preferable to pressurize the pressurizing chambers 34, 79, 44, 80 on both outer sides of the valve body with the pressurized gas as described above, because the controlled fluid can be controlled more efficiently.

Further, FIG. 7 shows a main part of still another embodiment. In this embodiment, two pressurizing chambers 9 on both outer sides of the valve body 89 are provided.
2, 93 are connected by a communication hole 91 penetrating the rod portion 90 of the valve body 89, and pressurized gas flows from one pressurized gas inflow path 94 into the two pressurized chambers 92, 93. The other parts are similar to those of the control valve 70 of the embodiment shown in FIGS. 4 to 6.

In each of the above embodiments, a spring (not shown) is arranged in the small diameter end side pressurizing chamber 44, 80, 93 of the rod portion so that the valve bodies 11, 71, 89 are connected to the large rod portion. You may make it urge to the radial end side. The spring makes it possible to more reliably control even a slight change in pressure.

[0025]

As shown and described above, according to the present invention, the secondary flow rate and the secondary pressure of the fluid can be controlled with an extremely simple structure, and the durability and maintainability are excellent. Moreover, the control valve can be made of a material having high corrosion resistance or chemical resistance, which is extremely useful. Furthermore, it operates by simply supplying pressurized gas for operation to the control valve, and by controlling the pressure of the pressurized gas supplied,
The flow rate and pressure on the secondary side can be easily controlled. Therefore, simply control the pressure of the pressurized gas at the position of the pressurized gas supply source that is connected to the control valve by a pipe and away from the control valve, or at the desired position between the control valve and the pressurized gas supply source. The flow rate and pressure on the secondary side can be controlled with and remote control is extremely easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a control valve according to an embodiment of the present invention.

FIG. 2 is a perspective view of a valve body used in the embodiment.

FIG. 3 is a partially enlarged cross-sectional view illustrating the operation of the embodiment.

FIG. 4 is a vertical cross-sectional view of another embodiment.

FIG. 5 is a perspective view of a valve body used in the embodiment.

FIG. 6 is a partial enlarged cross-sectional view illustrating the operation of the embodiment.

FIG. 7 is an enlarged sectional view of an essential part showing still another embodiment.

[Explanation of symbols]

 11 valve body 12 rod part 17 flow control part 22 diaphragm 31 valve body 33, 34 pressurized gas inflow path 34, 44 pressurization chamber 53 valve chamber 56 controlled fluid passage 58 flow control passage portion 59 controlled fluid inlet 60 controlled Control fluid outlet

Claims (2)

[Claims] 1. A rod comprising a valve body and a valve body, wherein the valve body has a flow rate control portion protruding from one end of a cylindrical shape to have a diameter larger than that of the other end and projecting to a side surface outer periphery between both ends. And a diaphragm provided at least on the large-diameter side end portions of both ends of the rod portion so as to project in a flange shape to the outer periphery of the end portion, and the valve body fixes the outer peripheral edge of the diaphragm to the rod portion. A valve chamber accommodating a valve body slidably in the axial direction, a pressurizing chamber outside the valve chamber and partitioned from the valve chamber by a small diameter side end surface of a diaphragm or a rod portion, an outer periphery of the rod portion and a valve chamber. A controlled fluid passage formed between the flow control portion and a wall surface of the valve chamber, which is formed between the flow control portion and the wall surface of the valve chamber and narrows as the rod portion slides toward the large diameter end side; Connected to the controlled fluid passage on the small diameter end side The controlled fluid inlet opening on the outer surface of the valve body, the controlled fluid outlet opening on the outer surface of the valve body in communication with the controlled fluid passage on the large diameter end side of the rod portion, and communicating with the pressurizing chamber. A fluid control valve comprising a pressurized gas inflow passage opening on the outer surface of the valve body. 2. The first diaphragm according to claim 1, wherein the diaphragm is provided at an end portion on the large diameter side of the rod portion, and the first diaphragm provided at an end portion on the small diameter side of the rod portion, the diameter being smaller than that of the first diaphragm. A fluid control valve consisting of two diaphragms, wherein the pressurizing chamber is separated from the valve chamber by both diaphragms.