JPS5930286Y2 - mixing valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mixing valve with a variable mixing ratio for mixing two types of fluids.

For example, when two types of gases A and B are mixed to obtain a mixed gas flow having a desired mixing ratio, the method shown in FIG. 1 has been conventionally adopted.

That is, needle valves a and b are interposed in the middle of the flow paths connecting to tank P1 of gas A and tank P2 of gas B, and the opening degree of the joint valve is adjusted separately, and the output gases of valves a and b are added together. to produce an output stream of mixed gas in the desired proportions.

This method has the drawback that the operation of adjusting the mixing ratio to a desired value is complicated, and furthermore, if the mixing ratio is changed, the output flow rate of the mixed gas also changes significantly.

As a method to eliminate the latter drawback, there is a method of connecting the valve stems of two needle valves with gears and adjusting the opening of the joint valve in relation to each other, but a device that employs this method is expensive.

The object of the present invention is to provide a mixing valve that can overcome the above-mentioned drawbacks.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 2 is a structural explanatory diagram of an embodiment of the present invention.

A is an elevational sectional view of an embodiment of the present invention taken along a plane including the central axis of the valve body, and b is a half side view of the outer surface.

In the figure, 1 is a cylindrical valve body, 2 is a valve stem, 3 is a total flow rate setting nut, 4 is a bearing nut for the valve stem 2, and 5 is a nut 3.
The lock nut 8 is a lock fixed to one end of the valve stem 2.

A ring-shaped male screw 9, which is thicker than the valve stem, is fixed in the middle of the valve stem 2.

This male screw 9 is paired with a female screw portion 10 located on the inner wall of the intermediate portion of the cylinder that passes through the center of the valve body 1.

Valve stem 2I/'i male thread 90 Conical valve (hereinafter referred to as needle valve) portion 11 on each side (left and right in the figure)
．． 12.

In both needle valves 1L12, the diameter of the cross section (circle) becomes smaller as the male threaded portion 9 moves further away.

The valve stem 2 has a bearing hole 1 through which a bearing nut 4 closes the cylindrical left end of the valve body 1, and is slidably held by the nut 4.

A portion 11B of the cylindrical inner wall of the valve body faces the first needle valve 11, serves as a valve seat for the needle valve 11, and together they form a throttle valve 13 (first throttle valve).

The total flow rate setting nut 3 is provided with a fluid inlet pipe (second artificial pipe) 14A that passes through its center and penetrates from the gas inlet (second artificial pipe) 14 to the inner surface of the nut. The portion 12B in the vicinity thereof faces the second needle valve 12 and serves as a valve seat for the second needle valve 12, and together they form a throttle valve (second throttle valve) 15.

Further, the cylindrical bearing of the valve body 1 has a quadruple overlapped portion between the inner surface of the nut 4 and the first throttle valve 13, which forms a first chamber 16.
A second chamber 17 is formed between the first throttle valve 13 and the male screw 9, and a third chamber 18 is formed between the male screw 9 and the inner surface of the nut 3.

Further, a first artificial pipe line 19A leading from the side surface of the valve body 1 to the first chamber 16 is provided, and a mixed gas outlet pipe line leading from a part 20 of the side face of the valve body to the second chamber 17 is provided. 20A
is provided.

In addition, a pipe line 21 leading from the third chamber 18 to the outlet pipe line 20A
is provided.

The O-ring 22 keeps the space between the bearing nut 4 and the cylindrical inner wall of the valve body airtight, and the O-ring 23 keeps the space between the valve stem 2 and the bearing nut 4 airtight.
The O-IJ song 4 maintains an airtight space between the large diameter portion of the cylindrical inner wall of the valve body 1 and the outer periphery of the nut 3.

The male thread 9 of the valve stem 2 and the female thread part 10 of the inner wall of the cylinder that engages with the male thread 9 form a fine movement mechanism that slightly moves the valve stem 2 from side to side parallel to the axis of the valve body.

That is, when the knob 18 at one end of the valve stem 2 is turned clockwise, the valve stem 1 is slightly deviated to the right or to the left in parallel with the axis, corresponding to the rotation angle of the stem 1.

Alternatively, by using the screw pair between the total flow rate setting nut 3 and the female thread 26 on the cylindrical inner wall of the valve body 1, rotation of the nut 3 causes the nut 3 to be deviated in the axial direction, and the nut 3 is set at a desired position. can.

The output flow rate of this mixing valve can be adjusted by the set position of this nut 3.

When mixing two types of gases A and B using the gas mixing valve shown in FIG. 2, the supply pipes (not shown) for A gas and B gas are 14 and introduce A and B gases into pipes 19A and 14A.

The position of the valve stem 2 when the valve stem 2 is at the leftmost position with respect to the valve body 1 and the needle valve 11 of the first throttle valve 13 and the valve seat 11B facing it are in close contact with each other. Use as reference position.

Furthermore, when the valve stem 2 is in this reference position, the full flow rate setting nut 3 engages with the female thread 26 at the right end of the cylindrical inner wall of the valve body 1, and the valve seat 12B of the second throttle valve 15 at the left end of the engaging nut 3 engages with the valve seat 12B of the second throttle valve 15 at the left end of the engaging nut 3. stick 2
The position of the nut 3 when the needle valve 12 at the right end of the nut 3 is in close contact with the needle valve 12 is defined as the reference position of the nut 3.

The shapes of the first throttle valve 13 and the second throttle valve 15 are made to be identical except that the slopes of the needle valve and the valve seat (hole) facing it are opposite to each other.

When the setting nut 3 is in its reference position, the first throttle valve 13
Both the second throttle valve 15 and the second throttle valve 15 are closed, so the flow rate of the mixed gas flowing out from the outlet is zero.

With the setting nut 3 set at a position that allows it to move an arbitrary amount to the right from its reference position, tighten the valve stem 2 by 8.
If you turn and move left and right, the set position of the valve stem 2 will change, and corresponding to the set position, the first. The opening degrees of the second throttle valves change oppositely to each other, and the mixing ratio of the two types of gases A and B flowing out from the output port 20 can be changed.

In addition, the total flow rate of the mixed gas flowing out of the output port 20 can be changed by adjusting the total flow rate setting nut 3 and changing the setting position of the setting nut 3 with respect to the valve body 1.

1. The opening degree of the first throttle valve 13 is proportional to the amount of rightward deviation of the valve stem 2 from its reference position, and the opening degree of the second throttle valve 15 is proportional to the amount of deviation of the valve stem 2 from its reference position to the right. It is assumed that each of the first and second throttle valves is formed so as to be proportional to the amount of displacement to the left from the closed position of No. 15.

In such a case, the flow rate of the mixed gas flowing out of the output 20 is determined by the setting position of the total flow rate setting nut 3.

That is, the total flow rate is proportional to the amount of rightward displacement of the setting nut 30 from the reference position, and has the advantage that it is not affected by changing the mixing ratio of the mixed gas by moving the valve stem 2 to the left or right.

FIG. 3 shows the amount of A included in the output mixed gas with respect to the rightward deviation of the valve stem 2 from the reference position when the total flow rate setting nut 3 is set at a certain fixed position.

B shows the flow rate of each gas.

That is, corresponding to the amount of displacement of the valve stem 2 from the reference position, A,
B shows that although the flow rate ratio of each gas changes, the flow rate of the mixed gas is constant.

Figure 4 shows the flow rate of each gas A and B contained in the output mixed gas with respect to the deviation d to the right from the reference position of the valve stem 2 when changing the setting position 3 to the full flow rate setting knob. .

Straight line A is the flow rate of A gas with respect to the deviation amount d of valve stem 2, B1
1/'i The flow rate of B gas with respect to the deviation amount d of the valve stem 2 when the deviation position of the setting nut 3 from the reference position is the maximum deviation amount Dmax, B2 is the deviation amount of the setting nut 3 or 2 /3
At Dmax, the dimension B3 is the deviation measure or 1/3D
The flow rate of B gas with respect to the deviation amount d of the valve stem 2 at max is shown.

The above-mentioned embodiments are as follows. The opening degree of the second throttle valve is valve stem 2
The total flow rate of the mixed gas output is determined by the setting position of the total flow rate setting nut 3, and is unrelated to the amount of deviation of the valve stem 2. is not limited to such cases.

In general, it is only necessary that the opening degree of each restricting portion changes in relation to the eccentric position of the valve stem 2 depending on the shape of each restricting portion.

Generally, in such a case, even if the set position of the setting nut 3 is constant, the output flow rate of the mixed gas will vary somewhat depending on the amount of deviation of the valve stem 2.

According to the mixing valve of the present invention, the mixing ratio of two types of gas is the valve stem 2
The mixing ratio can be changed over a wide range just by turning one knob, and the mixing ratio is easy to set.

Also, changing the total flow rate of the mixed gas is extremely easy.

Since the mixing valve of the present invention has a uniaxial structure, it is easy to manufacture and can be manufactured at low cost.

Depending on the shape of the throttle valve, mixed gases with various mixing ratios can be obtained by simply turning the knob 8 on the valve stem 2.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventionally known method for obtaining a mixed gas flow. FIG. 2 is a structural explanatory diagram of an embodiment of the present invention. FIG. 3A shows an elevational cross-sectional view of an embodiment of the present invention, and FIG. FIG. 3 is a diagram showing the relationship between the flow rate of each gas A and B with respect to the amount of deviation of the buttoned valve stem 2 from the reference position in the embodiment of the present invention. FIG. 4 is a diagram showing the relationship between the flow rates of each gas A and B with respect to the amount of deviation of the valve stem 2 from the reference position at the set position of the total flow rate setting nut. In Fig. 2, 1...valve body, 2...valve stem, 3...
・Full flow rate setting nut, 4... Bearing nut, 5... Lock nut, 8... Thickness, 9... Valve stem male thread,
10... Cylindrical internal conical thread portion, 11... First needle valve, 1
2...Second needle valve, 13...First throttle valve, 12B...
・Valve seat, 14A...Second artificial pipe, 16...First chamber, 1γ...Second chamber, 18...Third chamber, 19A...
1st artificial conduit, 20A... outlet conduit, 21... conduit.

Claims (1)

[Scope of utility model registration request] A cylindrical valve body, a total flow rate setting nut that meshes with a female threaded portion at one end of the inner wall of the cylinder and can be set to be deflectable in parallel to the axial direction with respect to the valve body; a bearing nut in the cylinder of the body, one end of which closes the other end of said inner cylinder wall, said bearing having a valve stem slidably engaged with said bore, said valve stem being in the middle of said inner cylinder portion; The part has a male threaded part that rotatably engages with a female threaded part in the middle part of the cylindrical inner wall, and the male threaded part is sandwiched therein, and the bearing has a part on the nut side and a part on the opposite side, respectively. A first needle valve and a second needle valve are provided, and the total flow rate setting nut is provided with a second artificial conduit passing through its axis and leading from one end of the outer surface to the inner surface thereof, and the first needle valve is opposed to this. The inner wall portion of the cylinder constitutes a first throttle valve, the second needle valve together with the outlet portion of the second artificial conduit opposing thereto constitute a second throttle valve, and the valve body is inserted into the cylinder from the outside. A first artificial conduit leading to a first chamber between the bearing nut and the first throttle valve, and a second chamber between the first throttle valve and the male thread of the valve stem in the cylinder from the outside. a third chamber between the external thread of the valve stem in the cylinder and the second throttle valve, and a conduit that communicates the output conduit with an outlet conduit that communicates with the third chamber;
The throttle valve increases or decreases the opening degree of the valve as the valve stem deviates in one direction or the opposite direction in the axial direction with respect to the valve body, and the second throttle valve increases or decreases the opening degree of the valve as the valve stem deviates from the valve body in one direction or the opposite direction. The mixing valve is configured to change the opening degree of the valve in a direction opposite to the opening degree of the first throttle valve as the first throttle valve deviates from the first throttle valve.