KR101799969B1

KR101799969B1 - Control valve for micro flow control

Info

Publication number: KR101799969B1
Application number: KR1020160004368A
Authority: KR
Inventors: 이권희; 김근연; 최지원; 고장훈
Original assignee: 동아대학교 산학협력단
Priority date: 2016-01-13
Filing date: 2016-01-13
Publication date: 2017-11-22
Also published as: KR20170084930A

Abstract

The present invention relates to a control valve for controlling minute flow rate. The valve seat is elastically supported on the valve seat side by a spring to block the valve seat. The valve seat is interposed between the valve seat and the valve seat. The valve seat is interposed between the inlet and the outlet, And a lift pivot for lifting the valve seat by a control signal transmitted from the valve seat so as to allow the fluid to pass through the valve seat, wherein, in a state in which the lift pivot blocks the valve seat, And a lifting pin is provided in the fluid passage for opening the fluid passage by the pressure of the fluid that has entered through the inlet port .

Description

[0001] The present invention relates to a control valve for micro flow control,

The present invention relates to a control valve for controlling minute flow rate.

There are many different types of valves installed in the pipeline for moving fluids such as various fluids, chemicals, or water or gas to a desired place. Such a valve functions to regulate the flow rate of fluid passing therethrough or to block the flow if necessary, and an optimum designed type is selected for the purpose of use.

Among the various valves described above, the control valve is a valve that controls the flow rate by remotely controlling the degree of opening of the plug to the valve seat. There are various types of control valves, such as a safety valve, a pressure reducing valve, a sequence valve, a throttle valve, a check valve, and a float valve, depending on the object to be controlled.

For example, in Korean Patent Registration No. 10-0892832 (pressure control valve), there are provided a sleeve having a plurality of input / output ports formed therein, a spool provided inside the sleeve, a solenoid portion for driving the spool, And the like.

However, the above-described conventional pressure control valve has a disadvantage in that it is inefficient to be used for controlling a minute hydraulic pressure because of its complicated internal structure and large size.

An object of the present invention is to provide a control valve for controlling a minute flow rate, which has a simple structure and a small number of parts, is easy to maintain and can be used for a low pressure.

According to an aspect of the present invention, there is provided a control valve for controlling minute flow rate, comprising: a body having an inlet and an outlet; a valve seat disposed between the inlet and the outlet for passing a fluid through the inlet; And an elevating pivot which is elastically supported on the valve seat side so as to block the valve seat and which is caused to ascend by a control signal transmitted from the outside to be separated from the valve seat so that the fluid passes through the valve seat, And a fluid passage formed in the fluid passage so as to allow the fluid that has entered the inlet port to pass therethrough to the outlet port side in a state where the valve seat is blocked and the fluid passage is moved by the pressure of the fluid introduced through the inlet port And a lift pin for opening the fluid passage is provided.

Further, the lifting pivot may take the form of extending upwardly in the vertical direction over the valve seat, the fluid passage including: A guide hole extending vertically from a lower end of the lifting pivot; a chamber formed at an upper end of the guide hole; and a side hole extending laterally from the chamber and opened to the periphery of the lifting pivot.

In addition, the elevating pin may include: And a head portion which is accommodated in the chamber in a state of being fixed to the upper end of the rod portion and opens and closes the side hole when the rod is lifted and lowered.

Further, a pin spring for downwardly supporting the head portion of the lifting plate is provided inside the chamber.

The control valve for micro flow rate control according to the present invention is simple in structure and has a small number of parts and is easy to maintain and can be effectively used for a low-pressure flow line.

FIG. 1 is a cross-sectional view illustrating a configuration of a micro-flow control valve according to an embodiment of the present invention. Referring to FIG.
2 is a sectional view showing a part of the structure of the lifting pivot shown in FIG.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Basically, the micro flow rate control control valve 11 according to the present embodiment forms a passage that can be opened by the fine pressure on the lift pivot 23 provided inside the control valve 11, And has a structure suitable for controlling the flow rate.

FIG. 1 is a cross-sectional view for explaining an internal configuration of a micro-flow control valve 11 according to an embodiment of the present invention. 2 is a sectional view showing a part of the structure of the lifting pivot 23 shown in Fig.

As shown in the drawing, the micro-flow control valve 11 according to the present embodiment includes an inlet port 13b, an outlet port 13c, and an internal space 13a in the longitudinal direction so as to allow fluid to pass therethrough. A body (13) fixed to the upper part of the body (13) and blocking the internal space (13a), a bonnet (19) supported to be movable up and down by the bonnet (19) And a valve seat 15 fixed to the inner space 13a and in the form of a ring and in contact with the lower end of the lifting pivot 23. The lifting pivot 23 is located in the space 13a.

It is needless to say that the outer pipe is connected to both ends of the body 13 in an appropriate manner as long as the control valve 11 according to the present embodiment controls the flow of the fluid.

The lifting pivot 23 is a vertically extending bar-like member supported by the guide bushing 17 and the bonnet 19, and moves up and down by receiving a signal from a solenoid coil (not shown). The lower end of the lifting pivot 23 is inserted into the valve seat 15 as a plug portion 23a to open or shut off the valve seat 15.

In addition, a spring 25 is installed to elastically support the lifting pivot 23 downward. The spring 25 elastically supports the lifting pivot 23 downward in a state in which the lower end of the spring 25 is engaged with the pressing jaw 23e formed at the substantially central portion of the lifting pivot 23. [

The inner surface of the bonnet 19 is provided with an engagement protrusion 19a for receiving the pressing protrusion 23e. The latching jaw 19a blocks the downward movement so that the pressing jaw 23e is supported by the upper portion so that the pressing jaw 23e does not descend further.

Reference numeral 27 denotes a packing part. The packing 27 seals the internal space 13a and supports the spring 25 downward. Needless to say, the lifting pivot 23 can slide relative to the packing portion 27.

On the other hand, a guide hole 23d, a chamber 23c, and a side hole 23b are formed in the plug portion 23a of the lifting pivot 23.

The guide hole 23d has a predetermined inner diameter and extends in the vertical direction and has the same center axis as the center axis of the lift pivot 23. Particularly, the lower end of the guide hole 23d is open to the lower portion of the lift pivot 23, and the upper end thereof is located at a higher altitude than the valve seat 15 in the state where the lift pivot 23 is at its maximum descent.

The chamber 23c is a space formed in the upper end of the guide hole 23d and has an inner diameter larger than the inner diameter of the guide hole 23d and accommodates the head portion 29a and the pin spring 31 to be described later.

In addition, the side hole 23b is a passage formed in the lateral direction of the head portion 29a, and opens the inner space of the head portion 29a in the lateral direction. The inner diameter of the side hole 23b may be the same as the inner diameter of the guide hole 23d.

A lift pin 29 is provided inside the guide hole 23d and the chamber 23c. The lifting pin 29 has a rod portion 29b in the form of a round bar and received in the inner space of the guide hole 23d and a rod portion 29b integrally formed with the upper end portion of the rod portion 29b and located in the chamber 23c And a head portion 29a which receives the pressure of the fluid introduced through the inlet port 13b and moves upward in the direction of arrow F or repeats the action of falling by the action of the pin spring 31. [

A passage or a gap through which fluid can pass is formed between the outer peripheral surface of the rod portion 29b and the inner peripheral surface of the guide hole 23d.

The pin spring 31 serves to elastically support the head portion 29a downward while being installed inside the chamber 23c. It goes without saying that the pin spring 31 is pressed against the head portion 29a when the lifting pin 29 is lifted.

The head portion 29a blocks the side hole 23b in a state where the lifting pin 29 is lowered. However, due to the pressure of the fluid that has entered the lower portion of the inner space 13a, the lifting pin 29 is pushed up when the lifting pin 29 is lifted to open the side hole 23b.

When the lift pivot 23 can not be raised finely in a state in which a small amount of fluid has to be passed through the body 13, the lift pin 29 and the pin spring 31 act, Of the fluid.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

11: Control valve 13: Body
13a: inner space 13b: inlet
13c: outlet 15: valve seat
17: guide bushing 19: bonnet
19a: Jaw 23: Lift Pivot
23a: plug portion 23b: side hole
23c: chamber 23d: guide hole
23e: pressure jaw 25: spring
27: packing part 29: lift pin
29a: head portion 29b: rod portion
31: Pin spring

Claims

A body 13 having an inlet 13b and an outlet 13c,
A valve seat 15 disposed between the inlet port 13b and the outlet port 13c for passing the fluid introduced through the inlet port 13b,
And is elastically supported by the spring 25 toward the valve seat 15 so as to block the valve seat 15. The valve seat 15 is lifted by a control signal transmitted from the outside to be separated from the valve seat 15, And an elevating pivot (23) for letting it pass therethrough,
In the elevation pivot 23,
A fluid passage formed so as to allow the fluid that has entered the inlet port 13b to pass therethrough to the outlet port 13c while the lift pivot 23 is blocking the valve seat 15, Extends in the vertical direction and extends upwardly in the vertical direction,
The fluid passage includes a guide hole 23d extending vertically from the lower end of the lifting pivot 23 and a chamber 23c formed at the upper end of the guide hole 23d. And a side hole (23b) extending to the periphery of the lifting pivot (23)
A rod portion 29b capable of moving up and down in the state of being inserted into the guide hole 23d by opening the fluid passage by the action of the fluid pressure introduced through the inlet 13b,
A lifting pin 29 including a head portion 29a which is accommodated in the chamber 23c while being fixed to the upper end of the rod portion 29b and opens and closes the side hole 23b when lifted and lowered, A pin spring 31 for elastically supporting the head portion 29a of the lifting pin 29 is provided in the chamber 23c to allow a small amount of fluid to pass through the body 13 Wherein the lift pin (29) and the pin spring (31) are actuated to supply a small amount of fluid when the lift pivot (23) can not be raised finely.

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