JPH11296232A - Constant flow-rate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant flow-rate valve the metallic spring of which is not affected by corroding fluid. SOLUTION: A channel is divided into the upstream side and the downstream side by a bulkhead 2 formed in a valve body 1, a flow-rate controlling valve body 41 is formed on the lower end of a valve shaft 4 penetrating into a through hole 21 pierced into the bulkhead 2 so as to advance and retreat, a diaphragm 5 is formed on the upper end of the valve shaft 4, and a spring 9 for normally energizing the valve shaft 4 to the downstream side is attached in an upper space separated by the diaphragm 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant flow valve.

[0002]

2. Description of the Related Art Conventionally, a water passage is divided into an upstream side and a downstream side by a partition wall provided inside a valve body, and a valve shaft penetrated coaxially forward and backward through a through hole formed in the partition wall. A constant flow valve provided with a flow control valve having a substantially frustoconical shape at the lower end thereof and having a spring that constantly urges the valve shaft to the downstream side is disclosed in, for example, JP-A-61-290282. As is known.

[0003]

However, in such a constant flow valve, since the sprung is immersed in the fluid, when the sprung is used for transporting corrosive fluid, the sprung is expensive. It had to be coated with a fluorinated ethylene resin.

[0004] It is an object of the present invention to solve the above-mentioned conventional problems and to provide a constant flow valve in which a metal spout is not corroded by a corrosive fluid.

[0005]

In the constant flow valve according to the first aspect of the present invention, the water passage is divided into an upstream side and a downstream side by a partition provided inside the valve body, and the water passage is formed in a horizontal portion of the partition. A flow contractor having a water passage hole drilled in the side wall is fitted into the provided through hole, and a substantially frustoconical flow rate is formed at the lower end of a valve shaft that is coaxially advanced and retracted through the flow contraction tube. An adjustment valve body and a water stop collar are provided,
A diaphragm is provided at the upper end of the valve shaft, and a spring that constantly urges the valve shaft to the downstream side is mounted in an upper space separated by the diaphragm.

In the constant flow valve according to a second aspect of the present invention, the water passage is divided into an upstream side and a downstream side by a partition provided inside the valve main body. A flow control valve body having a substantially truncated cone shape is provided at a lower end of a valve shaft which is fitted with a flow reducing pipe having a water passage hole and is penetrated coaxially with the flow reducing pipe so as to advance and retreat. A diaphragm is provided at the upper end of the valve, and a spring that constantly urges the valve shaft to the downstream side is mounted in an upper space separated by the diaphragm.

[0007] In the constant flow valve according to the first and second aspects of the present invention, the material of the valve body is not particularly limited as long as it is not corroded by the fluid to be conveyed. Is mentioned.

In the constant flow valve according to the first and second aspects of the present invention, the material of the flow control valve provided at the lower end of the valve shaft is not particularly limited as long as it is not corroded by the fluid to be transported. Synthetic resin, metal, synthetic resin-coated metal and the like can be mentioned. Although the shape is not particularly limited, it is preferable to have a substantially truncated cone shape so that the flow rate can be adjusted steplessly.

[0009] It is preferable that a water-stop flange which can shut off the flow of the fluid is provided below the flow control valve body. The material of the water stopping collar is not particularly limited as long as it is not corroded by the fluid to be transported, and examples thereof include a synthetic resin, a metal, and a metal coated with a synthetic resin. It is preferable that an annular sealing material is provided at the upper end of the water stopping flange so as to be in close contact with the lower end of the through hole or the contraction pipe so that the water can be stopped.

In the constant flow valve according to the first and second aspects of the present invention, the material of the diaphragm provided at the upper end of the valve shaft is particularly limited as long as it is rich in elasticity and can isolate the upper space from the flow passage in a watertight manner. Instead, for example, a thermoplastic elastomer may be used.

When the diaphragm receives the primary pressure of the fluid, it rises against the compressive force of the sprout, and stops at a position where the compressive force of the sprout and the primary pressure of the fluid are balanced. With the rise of the diaphragm, the flow regulating valve body is moved upward, the gap between the inner surface of the through hole or the inner surface lower end of the contraction pipe and the outer peripheral surface of the flow regulating valve body is reduced,
The flow path area changes according to the corresponding primary pressure, and a constant flow rate is maintained.

The flow rate is calculated by the following equation (1). Equation 1 Q = S × α × (2gΔP / ρ) ^{0.5 In} Equation 1 above, Q is the flow rate, S is the flow path area, α is a coefficient, 2gΔP is the differential pressure, and ρ is the fluid density. The flow path area with respect to the required flow rate was calculated by Equation 1 and shown in FIG.

[0013] ΔP is replaced by the axial displacement of the valve stem according to the effective area of the diaphragm and the firing constant, and S is a flow path formed in the gap between the inner surface of the through hole or the lower end of the inner surface of the contraction pipe and the outer peripheral surface of the flow regulating valve body. Is determined at an arbitrary point in the axial direction of the flow regulating valve body.

In the constant flow valve according to the second aspect of the present invention, the material of the contraction pipe is not particularly limited as long as it is not corroded by the fluid to be conveyed. No.

The shape of the water passage hole formed in the side wall of the contraction pipe is not particularly limited, but is preferably a circular shape having good sweepability. The number is not particularly limited as long as it is formed at equal intervals. For example, it is preferable that the number is eight, six, or the like so that directionality does not easily occur at the time of fitting.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a constant flow valve according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the constant flow valve of the present invention.

In FIG. 1, reference numeral 1 denotes a valve body, and a water passage is divided into an inlet side and an outlet side by a partition wall 2 provided therein. A circular through hole 21 is formed in a horizontal portion of the partition wall 2, and eight circular water holes are formed in the side wall of the through hole 21.
The contraction pipes 3 pierced at equal intervals 31 are fitted.

A valve shaft 4 is penetrated through the contraction tube 3 so as to be able to advance and retreat coaxially, and a flow control portion having a substantially frusto-conical shape whose diameter is increased downward is provided at the lower end of the valve shaft 4. Valve element 41 and water stop collar 42
Are provided. The water stop flange 42 projects outward from the flow control valve body 41, and the lower end of the contraction pipe 3 is brought into close contact with an annular seal member 43 provided at the upper end of the water stop flange 42. The waterways are being closed.

At the upper end of the valve shaft 4, a diaphragm 5 made of an elastic material is provided. In the upper space isolated by the diaphragm 5, a substantially bottomed cylindrical lower spring receiver 6 which sandwiches the diaphragm 5 between the valve shaft 4 and the lower end of the handle 7 is attached. A spring 9 that constantly urges the valve shaft 4 to the downstream side is mounted between the spring 9 and the upper spring receiver 8.

When the primary pressure of the fluid rises, the flow rate instantaneously increases. However, the diaphragm 5 rises to a position where the compressive force of the struts 9 and the primary pressure of the fluid are balanced against the compressive force of the struts 9. Is done. As the diaphragm 5 rises, the flow regulating valve body 41 is raised, and the flow path formed in the gap between the lower end of the inner surface of the contraction pipe 3 and the outer peripheral surface of the flow regulating valve body 41 is narrowed to a constant flow rate with a slight time difference. Is restored.

When the primary pressure of the fluid decreases, the flow rate instantaneously decreases.
Of the fluid and the primary pressure of the fluid are balanced. As the diaphragm 5 descends, the flow control valve body 41 is lowered, and the flow path formed in the gap between the lower end of the inner surface of the contraction pipe 3 and the outer peripheral surface of the flow control valve body 41 is expanded, so that a constant flow rate is obtained with a slight time difference. Is restored.

In order to adjust the flow rate, the handle 7 is turned to lower the diaphragm 5, and the flow control valve element 41
The space between the inner surface lower end of the contraction pipe 3 and the outer peripheral surface of the flow regulating valve element 41 is expanded. Conversely, handle 7
Is rotated to raise the diaphragm 5, the flow regulating valve body 41 is moved upward in the contraction pipe 3, and the gap between the inner lower end of the contraction pipe 3 and the outer peripheral surface of the flow regulating valve body 41 is narrowed. Can be

[0023]

Since the constant flow valve according to the first aspect of the present invention is configured as described above, the metal spout does not come into contact with the fluid.
It is not corroded by corrosive fluids. Since the constant flow valve according to the second aspect of the present invention is configured as described above, the metal sprout does not come into contact with the fluid and is not corroded by the corrosive fluid.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a constant flow valve according to the present invention.

FIG. 2 is a graph showing a result of calculating a flow path area with respect to a required flow rate by Expression 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Partition wall 3 Contraction pipe 4 Valve shaft 5 Diaphragm 6 Lower spring receiver 7 Handle 8 Upper spring receiver 9 Spring 21 Through hole 31 Water flow hole 41 Flow control valve body 42 Water stop flange 43 Sealing material

Claims (2)

[Claims] A water channel is divided into an upstream side and a downstream side by a partition provided inside a valve body, and a water passage is formed at a lower end of a valve shaft which is penetrated to be able to advance and retreat through a through hole formed in the partition. , A flow regulating valve body is provided, a diaphragm is provided at an upper end of the valve shaft, and a spring that constantly urges the valve shaft to the downstream side is mounted in an upper space separated by the diaphragm. Constant flow valve. 2. A water channel is divided into an upstream side and a downstream side by a partition wall provided inside the valve body, and a water passage hole is formed in a side wall in a through hole formed in the partition wall. At the lower end of the valve shaft, which is fitted with a flow tube and is capable of moving forward and backward coaxially with the contraction tube, a flow control valve body having a substantially truncated cone shape is provided, and a diaphragm is provided at the upper end of the valve shaft, A constant flow valve characterized in that a spring that constantly urges a valve shaft downstream is mounted in an upper space isolated by a diaphragm.