JPH0515658Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a fine flow rate adjustment valve used to finely adjust the flow rate of a fluid.

(Prior Art) Conventionally, as this type of micro-flow regulating valve, one shown in FIG. 3, for example, is known.

The microflow regulating valve 100 basically includes a valve box 103 having a flow path 101 and a valve seat 102 formed in the middle thereof, and a valve stem 104 that is movably provided in the valve box 103 and driven up and down. , and a needle-shaped valve body 105 that is provided on a valve stem 104 and seats on and leaves the valve seat 102.

However, in this type of valve, the valve stem and the valve body are directly connected to move them up and down at an equal ratio, so it is not possible to precisely finely adjust the flow rate of the fluid.

(Problems that the invention attempts to solve) This invention was created in view of the problems mentioned above and to solve them, and its purpose is to:
To provide a fine flow rate adjustment valve that can precisely and finely adjust the flow rate of fluid.

(Means for solving the problem) The micro flow rate adjustment valve of the present invention that solves this problem is
a valve box having a flow path and a valve seat formed in the middle;
A valve stem that is installed in the valve body so that it can be raised and lowered in the axial direction;
A valve body is provided in the valve box so as to be movable up and down in the axial direction of the valve stem, and the valve body is placed in and out of the valve seat. a lateral moving body that is relatively immovable in the direction and relatively movable in the lateral movement direction orthogonal to the direction; and a lateral moving body that is provided between the valve stem and the lateral moving body and that causes the lateral moving body to move slightly laterally as the valve stem moves up and down. The present invention includes a first conversion mechanism and a second conversion mechanism that is provided between the lateral movement body, the valve body, and the valve body, and that slightly raises and lowers the valve body based on the lateral movement of the lateral movement body. The first conversion mechanism includes a first inclined surface formed on one of the valve stem and the transverse moving body, which is inclined at an angle smaller than 45 degrees with respect to the vertical movement direction, and a shaft rotatably formed on the other of these surfaces. The roller includes a roller that is supported and rolls into contact with the first inclined surface, and a first elastic member that urges the transverse member in the transverse direction so as to press and hold the roller against the first inclined surface. Further, the second conversion mechanism includes a second inclined surface formed on one of the valve body and the valve body, which is inclined at a minute angle smaller than 45 degrees with respect to the lateral movement direction, and a second inclined surface formed on the other of these. , a non-inclined surface parallel to the lateral movement direction, and a second elastic member that biases the valve body in order to hold the lateral movement body under pressure between the second slant surface and the non-slope surface so as to be able to freely move laterally. It will be equipped.

(Operation) When the valve stem is moved up and down, the first conversion mechanism causes the roller to relatively roll on the first inclined surface, and the transverse moving body is caused to move laterally along the first inclined surface. This amount of lateral movement is extremely small compared to the amount of elevation of the valve stem because the first inclined surface is inclined at an angle smaller than 45 degrees with respect to the vertical direction, that is, the direction perpendicular to the lateral movement direction. small.

When the lateral moving body moves laterally, the second conversion mechanism moves the lateral moving body up and down along the second inclined surface while being held under pressure between the second inclined surface and the non-inclined surface. Then the valve body is raised and lowered. This amount of vertical movement is extremely large compared to the amount of lateral movement of the lateral movement body, since the second inclined surface is inclined at an angle smaller than 45 degrees with respect to the lateral movement direction, that is, the direction perpendicular to the vertical movement direction. small.

Therefore, the conversion ratio from lifting and lowering the valve stem to lifting and lowering the valve body is the same as the conversion ratio from lifting and lowering the valve stem to lateral movement to the lateral movement body by the first conversion mechanism and the lateral movement of the lateral movement body by the second conversion mechanism. This is given as a synergistic effect with the conversion ratio to the vertical movement of the valve body, and since the conversion ratio by the first conversion mechanism and the conversion ratio by the second conversion mechanism are extremely large as described above, the voltage applied to the valve body by the vertical movement of the valve stem is The amount of lifting and lowering required is extremely small.

When the valve body moves up and down slightly, it touches and leaves the valve seat, thereby finely adjusting the flow rate of the fluid flowing through the flow path.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of a microflow regulating valve according to an embodiment of the present invention when the valve is closed. FIG. 2 is a similar view when the valve is open.

The microflow regulating valve 1 includes a valve box 2, a valve body 3, a valve stem 4,
Its main parts are composed of a transverse moving body 5, a first conversion mechanism 6, and a second conversion mechanism 7.

The valve box 2 includes a flow path 9 and a valve seat 1 formed in the middle of the flow path 9.
0.

In this example, it is divided into three parts: top, middle, and bottom.
The upper valve box 11 and the middle valve box 12 are screwed together, and the middle valve box 12 and the lower valve box 13 are connected by bolts or the like (not shown), and there is no flow inside the lower valve box 13. A passage 9 and an upwardly facing valve seat 10 are provided.

The valve body 3 is provided in the valve box 2 so as to be movable up and down, and is placed on and off the valve seat 10.

In this example, it is divided into upper and lower parts, and the upper valve body 14 is fitted into the upper valve box 11 and the middle valve box 12 so as to be able to rise and fall, and the lower valve body 15 is flat and lower. It is fitted into the inside of the valve box 13 so as to be movable up and down, and comes into contact with and leaves the valve seat 10.

The upper valve body 14 and the lower valve body 15 are connected to a diaphragm 16 sandwiched between the middle valve box 12 and the lower valve box 13.
A valve spring 17 is interposed between the lower valve body 15 and the lower valve box 13 to move the lower valve body 15 upward.

The valve stem 4 is provided in the valve box 2 so as to be movable up and down, and is driven up and down.

In this example, it is fitted into the upper valve box 11 so as to be movable up and down, and is driven up and down by a lifting drive device (not shown) such as a pneumatic actuator installed in the valve box 2.

The lateral moving body 5 is provided between the valve body 2 and the valve body 3, and, together with the biasing action of the spring 17, is immovable relative to the valve body 3 in the vertical direction of the valve stem axis. Moreover, it is relatively movable in a lateral movement direction orthogonal to the above direction.

In this example, there is a pair on the left and right, each with a middle valve box 12.
It is installed inside so that it can be moved laterally.

The first conversion mechanism 6 is provided between the valve stem 4 and the lateral moving body 5 and causes the lateral moving body 5 to move slightly laterally as the valve stem 4 moves up and down. In addition, a first inclined surface 18 that is inclined at a small angle smaller than 45 degrees with respect to the vertical direction, a roller 19 that is rotatably supported on the other side and rolls into contact with the first inclined surface 18, and this roller. 19 as the first inclined surface 1
The first elastic member 8 urges the lateral moving body 5 in the lateral movement direction so as to press and hold the lateral movement body 5.

In this example, there are a pair of inclined surfaces 18 on the left and right, each formed on the lower outer surface of the valve stem 4 and having a slope of one-tenth that gradually inwards as it goes downward;
A roller 19 is rotatably provided inside the lateral moving body 5 and comes into contact with the inclined surface 18, and a roller 19 is interposed between the lateral moving body 5 and a screw body 27 screwed onto the side of the upper valve box 11. It consists of a compression spring 8 which is a first elastic member.

The lower part of the valve stem 4 is formed into a conical shape so that an inclined surface 18 is formed therein.

The second conversion mechanism 7 is provided between the valve box 2 and the lateral moving body 5 and between the lateral moving body 5 and the valve body 3 to slightly raise and lower the valve body 3 depending on the lateral movement of the lateral moving body 5.
and a second inclined surface 21 formed on one side of the valve body 3 and inclined at an angle smaller than 45 degrees with respect to the lateral movement direction, and a non-inclined surface parallel to the lateral movement direction formed on the other side. The surface 25 and the lateral moving body 5 are connected to the second inclined surface 2
1 and the non-inclined surface 25, the second elastic member 17 urges the valve body 3 so as to be held under pressure so as to be able to move laterally.
It is equipped with the following.

In this example, the spring 17, which is the second elastic member, is formed on the lower surface of the guide bodies 20, which are fitted into the inside of the upper valve box 11, and there are a pair of left and right guide bodies, respectively, and as they move outward, they gradually move downward. An inclined surface 21 having a slope of one-tenth, an inclined surface 22 formed on the upper surface of the transverse moving body 5 and corresponding to the inclined surface 21, and both inclined surfaces 2
1 and 22 and includes a plurality of rollers and a retainer; a horizontal surface 24 which is a non-slanted surface formed on the lower surface of the transverse moving body 5; and a horizontal surface 24 formed on the upper surface of the upper valve body 14. It consists of a horizontal surface 25 and a plane bearing 26 interposed between both horizontal surfaces 24 and 25 and provided with a plurality of rollers and a retainer.

Next, the operation will be explained based on such a configuration.

FIG. 1 shows the valve in a closed state.

At this time, the lateral moving body 5 is constantly urged toward the valve stem 4 by the spring 8, and the lower valve body 15
is constantly urged upward by the valve body spring 17.

In this state, when the valve stem 4 is raised by the lifting drive, the horizontal moving body 5 is moved inward by the elasticity of the spring 8 by the inclined surface 18 of the first conversion mechanism 6 and the roller 19. It moves slightly laterally.

When the lateral moving body 5 moves laterally, the inclined surfaces 21 and 22 of the second conversion mechanism 7, the plane bearing 23, and the horizontal surface 2
4, 25 and the plane bearing 26, the upper valve element 14, lower valve element 15, and diaphragm 16 of the valve element 3 are slightly raised by one-tenth of the elasticity of the valve element spring 17.

In other words, the rise of the valve stem 4 is converted into a slight rise of the valve body 3, and the conversion ratio at this time is one-tenth of the rise/lateral movement conversion ratio of the first conversion mechanism 6 and the lateral movement conversion ratio of the second conversion mechanism 7. This is synergistic with the dynamic/lifting conversion ratio of 1/10, and as a result, the valve body 3 rises by an amount l which is 1/100th of the amount L that the valve stem 4 rises.

When the lower valve body 15 of the valve body 3 rises slightly, the valve seat 10
As a result, the valve opens as shown in FIG. 2, and the flow rate of the fluid flowing through the flow path 9 is finely adjusted.

When the valve stem 4 is lowered, it is the opposite of the case where it is raised, so the details will be omitted.

In the previous embodiment, the valve box 2 is divided into three parts: upper, middle, and lower. However, the present invention is not limited to this, and other division methods may be used, for example.

Although the valve body 3 is divided into upper and lower parts in the previous embodiment, the present invention is not limited to this, and the valve body 3 may be made into one piece, for example.

Although the lower valve body 15 of the valve body 3 has a flat shape in the previous embodiment, the present invention is not limited to this, and may have a needle shape, for example.

Lateral moving body 5, first conversion mechanism 6 and second conversion mechanism 7
(excluding the second elastic member 17) in the previous embodiment,
Although one pair is provided on the left and right sides, the present invention is not limited to this, and for example, there may be one pair, or three or more.

In the previous embodiment, the first conversion mechanism 6
8 is provided on the valve stem 4, and the roller 19 is provided on the transverse moving body 5, but the present invention is not limited to this, and these may be reversed, for example.

In the previous embodiment, the first conversion mechanism 6
8 is provided with a slope that gradually goes inward as it goes downward, but the invention is not limited to this, and it may be provided with a slope in the opposite direction, for example.

In the previous embodiment, the first conversion mechanism 6
Although the slope of 8 is set to 1/10, the slope is not limited to this, and may be set to an appropriate slope of less than 1, for example.

In the previous embodiment, the first conversion mechanism 6
8 is shown to be a straight line, but it is not limited to this, and may be a curved line based on a function such as a quadratic function or a logarithmic function.

In the previous embodiment, the second conversion mechanism 7
Although the guide body 20 forming the valve body 1 is separate from the valve box 2, the present invention is not limited to this, and the guide body 20 may be integrated with the valve body 2, for example.

In the previous embodiment, the second conversion mechanism 7 includes inclined surfaces 21 and 22 and a plane bearing 23 between the valve box 2 and the lateral moving body 5, and horizontal surfaces 24 and 25 between the lateral moving body 5 and the valve body 3. and a flat bearing 26, but the present invention is not limited to this, for example, these may be reversed,
Or horizontal surfaces 24, 2 provided between the transverse moving body 5 and the valve body 3
5 may be an inclined surface.

In the previous embodiment, the second conversion mechanism 7
1, 22, plane bearing 23 and horizontal plane 2
4, 25 and a flat bearing 26, but the present invention is not limited to this. For example, it may be constructed of only the inclined surfaces 21, 22 and the horizontal surfaces 24, 25, or it may be provided on either the valve box 2 or the transverse moving body 5. A plurality of rollers and a lateral moving body 5 rotatably provided on the second inclined surface and the other side
The valve body 3 may be configured with a non-inclined surface provided on either one of the valve body 3 and a plurality of rollers rotatably provided on the other.

In the previous embodiment, the second conversion mechanism 7
1 and 22 are provided with gradients that gradually go downward as they go outward, but the invention is not limited to this, and they may be provided with gradients in the opposite direction, for example.

In the previous embodiment, the second conversion mechanism 7
Although the slopes of 1 and 22 are set to 1/10, the slope is not limited to this, and may be set to an appropriate slope of less than 1, for example.

Although the first elastic member 8 was a spring in the previous embodiment, the first elastic member 8 is not limited to this, and may be, for example, rubber.

(Effects of the invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) The amount of elevation and descent of the valve body relative to the amount of elevation and descent of the valve stem is determined by the slope of the first and second inclined surfaces, and is synergistically minimized as the slope is reduced (for example, If the slope of each slope is 1/10, the amount of elevation of the valve body relative to the valve stem will be 1/100).The above slope can be set freely without unnecessarily increasing the size of the first and second conversion mechanisms. In addition, each component of the first and second conversion mechanisms, except for those provided on the valve stem that moves significantly in the axial direction, only makes contact movement within an extremely small range, and the movement space is limited. Since it is extremely small, it is possible to provide a compact fine flow rate adjustment valve that can extremely finely adjust the flow rate.

(2) The constituent members of the first and second conversion mechanisms are not connected to each other as in a link mechanism, but are in contact movement with the other member, and most of these contact movements are as described above. The contact movement is carried out in a minute range as shown in FIG.
Because it performs point contact motion with little motion resistance,
The vertical movement of the valve body via the conversion mechanism by the vertical movement of the valve stem is extremely smooth, and there is no possibility of malfunction, making it possible to provide a highly reliable micro-flow regulating valve.

(3) Since the lifting and lowering of the valve stem can be converted into slight lifting and lowering of the valve body, the valve stem can be raised and lowered by the lifting drive machine in the same way as in the past.

(4) Since the operating force of the valve stem is multiplied (for example, 100 times) and transmitted to the valve body, high-pressure fluid can be closed even if the driving force of the lifting drive is small, and the lifting drive can be made more compact. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a microflow regulating valve according to an embodiment of the present invention when the valve is closed. FIG. 2 is a similar view when the valve is open. FIG. 3 is a longitudinal cross-sectional view showing a conventional microflow control valve. DESCRIPTION OF SYMBOLS 1...Microflow adjustment valve, 2...Valve box, 3...Valve body, 4...Valve stem, 5...Transverse motion body, 6...First conversion mechanism, 7...Second conversion mechanism, 8... ... Spring (first elastic member), 9 ... Channel, 10 ... Valve seat, 1
7... Spring (second elastic member), 18... First inclined surface, 19... Roller, 21... Second inclined surface, 25... Horizontal surface (non-inclined surface).

Claims (1)

[Scope of utility model registration request] A valve body 2 having a flow path 9 and a valve seat 10 formed in the middle thereof, a valve stem 4 provided in the valve body 2 so as to be movable up and down in the axial direction, and a valve stem 4 provided in the valve body 2 so as to be movable in the axial direction of the valve stem. a valve body 3 that is moved and unseated from the valve seat 10;
A lateral moving body 5 is provided between the valve body 2 and the valve body 3, and is immovable relative to the valve body 3 in the vertical direction, which is the valve stem axis direction, and is movable relative to the lateral movement direction orthogonal to the vertical direction. , a first conversion mechanism 6 that is provided between the valve stem 4 and the lateral moving body 5 and causes the lateral moving body 5 to move slightly laterally as the valve stem 4 moves up and down, and the lateral moving body 5, the valve body 2, and the valve body 3. A second conversion mechanism 7 is provided between the valve stem 4 and the lateral movement body 5 to slightly raise and lower the valve body 3 according to the lateral movement of the lateral movement body 5. A first inclined surface 18 is formed in the vertical direction and is inclined at a small angle of less than 45 degrees with respect to the lifting direction. a roller 19 in contact with the roller 19; a first elastic member 8 that urges the lateral movement body 5 in the lateral movement direction so as to press and hold the roller 19 against the first inclined surface 18;
The second conversion mechanism 7 is formed on one of the valve body 2 and the valve body 3, and has a rotation angle of 45 mm with respect to the lateral movement direction.
a second inclined surface 21 which is inclined at a minute angle smaller than 100 degrees, a non-inclined surface 25 parallel to the lateral movement direction formed on the other of these 2 and 3, and a lateral movement body 5 as the second inclined surface 21; A fine flow rate adjustment valve characterized by comprising a second elastic member 17 that biases the valve body 3 so as to hold the valve body 3 under pressure between it and a non-inclined surface 25 so as to be able to move laterally.