JPH01141279A - Flow control valve - Google Patents

Abstract

PURPOSE:To control micro quantity of fluid with high accuracy by etching flow grooves enlarging from one side toward the other side on outer diameter lines in an outer diameter straight cylinder valve body section. CONSTITUTION:Fluid enters through a flow-in connection port 2 into a primary valve chamber 4 then moves into a secondary valve chamber 5. Fluid flowing through inclined grooves (a) etched in an outer diameter straight cylinder valve section A is cut by a part of an orifice at the end section of an overlapping valve seat section D, and thereby the controlled fluid passes through a fluid pass section (c) and discharged as flow to be controlled through a flow-out connection port 3. The operation is performed entirely through a handle wheel D associated with a valve rod c, and control function is exhibited such that the outer diameter straight cylinder valve body section A is reciprocated through lead screw of the valve rod C with the inner diameter section of the valve seat section being employed as a guide.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is designed to enable accurate control of fluids such as minute flow rates.

(Prior art) The conventional control of minute flow rates using valves, etc. is generally very difficult in terms of control ability and quality. I believe that the absolute necessity of relying on a needle system with as small a control function as possible is nothing but a contradiction to the basic considerations discussed above.

(Means for solving the problem) The establishment of minute flow control, which is the basis of the idea in the present invention,
We have repeatedly reconfirmed the principle of rationally reducing the cross-sectional area and wetted edge length between the valve seat and the valve body, as well as ensuring the stability of the valve body, and changing our way of thinking. The idea was to achieve this goal by cutting out the traditional method of measuring the circumference, and by thoroughly reducing the wet edges.

(Function and Examples) A0 In the fluid control using normally implemented valves, etc., the annular gap that occurs between them is maintained by moving the valve seats with a valve body with a tapered outer diameter, etc. Control of the flow rate based on the quadrature change of the cross-sectional area has become common sense.

Therefore, there is no special method even if we are trying to obtain a controlled flow rate at an extremely small level, and based on the above-mentioned basic considerations, it is strongly recommended that the valve body be made into a needle. I believe that this is not the case. There is no progress to be made other than making the orifice and valve body smaller to the maximum possible extent.

Incidentally, in preparation for controlling minute flow rates, the diameter IM/
Even if an M needle could be used, its wet edge length would be 3.14 M/M depending on the pi ratio, which would be compounded by the unevenness of the core accuracy as seen in history, and would naturally affect its accuracy. The quality of the flow rate is also poor, and even more so, the flow rate control in the 00 class leaves an extremely unsatisfactory feeling.

Therefore, in the present invention, the valve body is made to have a stable thickness within the possible range without waste, for example, IOM/M, and
Together with the valve seat that is paired with it, it has a high-quality fit with the piston specification, and on the outer diameter of the valve body there is a flow with the required number of threads and slope along the linear axis. This valve has a groove carved in it, and is designed to interact with the rotation of the screw on the valve stem so that the valve body can freely reciprocate along the axis using the valve seat fitted with the piston as a guide. It is.

By establishing the above-mentioned functional structure, the slight pre-failure and breakage of the valve body that normally occur with the needle valve structure are all eliminated.
By rationally reducing the length of the wetted edge by setting inclined grooves, etc. (usually valley-shaped flow grooves), the stability and miniaturization of the controlled flow rate at this time can be achieved due to the sharpness of the flow rate. It becomes.

In other words, the controlled flow creates a flow along several valleys on the valve body that engages with the valve seat, and depending on the required stopping position of the valve body, the Ihara end face (orifice) is adjusted to match the required stopping position of the valve body.
The answer to the question of flow rate control depends on the cross-sectional area formed in-situ.As a result, there is no longer an annular cross-sectional area, but only a small amount that forms a valley-shaped groove. The existence of gaps and a small and rational wetting area creates favorable conditions for control. In other words, the amount can be adjusted by expanding and widening the groove formed on the outer diameter of the valve body by the degree of inclination, etc. (valve body movement).
The result is the above-mentioned IM/
Control of minute flow rates, which is impossible even with M-diameter needles, is achieved through stable operation of the piston system with a thick stable valve body and valve seat.

If I were to explain the detailed function using a separate diagram,
First, fluid enters the primary valve chamber (4) from the inflow connection port (2), and then moves to the secondary valve chamber (5), during which time the fluid is controlled as described above. . In other words, the flow that attempts to pass through the inclined groove (a) etc. carved in the outer diameter fJ type valve body part (A) is affected by a part of the overlapping end cross-sectional orifice of the valve seat part (B) on the way. The cut is controlled, and the flow passes through the controlled fluid passage section (c) and flows out as a controlled flow through the outflow connection port (3).

All these operations are performed by the handle wheel (D) related to the valve stem (C).
As a result, the control function is achieved by the reciprocating movement of the outer diameter straight cylindrical valve body part (A) using the inner diameter part of the valve seat part (B) as a guide using the glued screw of the valve stem (C). However, at this time, the outer diameter straight cylindrical valve body part (A)
Since it is necessary to convert the torque into linear reciprocating motion in the axial direction so that the torque is not accompanied by the rotational motion of the screw due to the influence of the valve stem (C), the anti-rotation frictional resistance part (B) is designed to prevent rotation. We are considering torque conversion.

This is a first-rate flow control valve featuring the above features.

[Brief explanation of the drawing]

1 Valve box 2 Inflow connection port 3 Outflow connection port 4
Primary valve chamber 5 Secondary valve chamber A Outer diameter straight cylindrical valve body B Full-length valve seat C Valve stem D Handle wheel
A Inclined groove mouth Anti-rotation friction resistance part C Post-control fluid passage part

Claims (1)

[Scope of Claims] The present invention relates to a structure of a functional part necessary for flow control within a valve box constituting a general controllable valve. There is a valve body part (A), and a valve seat part (B) which also has a straight cylindrical inner diameter part and fits therein. The outer cylindrical valve body part (A) is provided with a flow groove (a) that expands from one side to the other on the outer diameter line in the flow direction, and has a rotation-stopping friction resistance (b). The present invention relates to a flow control valve characterized by the above features, in which the parts and the like are attached structures.