JPH084910A - Speed control valve - Google Patents

Abstract

PURPOSE:To provide a speed control valve which can be used for a long term by providing a cap-form supporting member which is provided so as to be externally inserted into a cylinder member and receives the large diameter part of an elastic diaphragm and the peripheral surface part excluding the vicinity thereof without interruption in the whole circumference. CONSTITUTION:This speed control valve is provided with a cylinder member 3 which is fixedly disposed on a coaxial line with a needle valve 2 inside a joint main body 1, an elastic diaphragm 4 externally inserted into the cylinder member 3 and a supporting member 5 which is externally inserted into the cylinder member 3 in order to receive the elastic diaphragm 4. The elastic diaphragm is a cone made of synthetic rubber and is constituted of a relatively thick bottom wall part 40 and a relatively thin conical piece part 41. In the speed control valve, the whole circumference of the conical piece part 4 is deformed so as to be uniformly expanded and contracted, and the elastic diaphragm 4 is not damaged in a short term, so that the speed control valve may be used for a long term.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called speed control valve composed of a flow rate control valve provided in a main flow path and a check valve provided in a bypass flow path.

[0002]

2. Description of the Related Art As a speed control valve of this type, for example,
There is one disclosed in Japanese Patent Publication No. 61-51714.

As shown in FIG. 7, this speed control valve has a flow control valve of a type in which a needle valve 90 is inserted into a tubular member 91 supported and fixed inside the joint main body 9, and the tubular member 91 is provided. The hole portion is used as the main flow passage 92A, and the space between the inner wall of the joint main body 9 and the outer wall of the tubular member 91 is used as the bypass flow passage 92B.

In the bypass flow passage 92B, as shown in FIGS. 7, 8 and 9, a cone-shaped elastic diaphragm 94 supported by a cap-shaped support member 93 having a large number of protrusions 93a is arranged. The elastic diaphragm 94 functions as a check valve. That is, when the air is pressure-fed from the air source to the air equipment, the air pressure causes the elastic diaphragm 94 to open and the bypass flow passage 92B to close, and conversely, when the air is discharged from the air equipment, Article 93a,
The elastic diaphragm 94 is narrowed by the pressure of air from between 93a, and the bypass flow passage 92B is opened.

However, when the elastic diaphragm 94 is in the open state as described above, as shown in FIG. The elastic diaphragm 94 may be deformed in a complicated direction, and the elastic diaphragm 94 may be damaged. This means that the speed control valve will be disabled. Incidentally, such a problem exists regardless of whether the control valve is for meter-in control or the control valve is for meter-out control.

In recent years, in the industry using fluid equipment, it is desired to develop a speed control valve that can be used for a long period of time.

[0007]

Therefore, it is an object of the present invention to provide a speed control valve that can be used for a long period of time.

[0008]

According to the present invention, the amount of air supplied to an air device per unit time in a mode in which a needle valve 2 is inserted into a flow path in a tubular member 3 supported and fixed inside a joint main body 1. And a substantially cone-shaped elastic diaphragm 4 is externally inserted into the tubular member 3 in a flow path formed between the inner wall of the joint main body 1 and the outer wall of the tubular member 3. A check valve is provided to constitute a speed control valve, which is provided in a manner to be externally inserted into the cylindrical member 3 and has an outer peripheral surface portion excluding a large diameter portion of the elastic diaphragm 4 and its vicinity without interruption. The cap-shaped support member 5 received in step 1 is provided.

The end face of the elastic diaphragm 4 on the large diameter side is
It is preferable that the tapered surface is inclined from the large diameter side to the small diameter side from the outer peripheral surface toward the inner peripheral surface.

[0010]

The present invention operates as follows.

In this speed control valve, the elastic diaphragm 4
Since the outer peripheral surface portion excluding the large diameter portion and its vicinity is received by the cap-shaped supporting member 5 over the entire circumference without interruption,
Unlike the speed control valve described in the section of the related art, the elastic diaphragm 94 does not deform in the circumferential and radial directions in a complicated manner, but deforms uniformly in the entire circumference. Therefore, stress concentration is unlikely to occur in the elastic diaphragm 94, so that the elastic diaphragm 94 has a long life and the speed control valve can be used for a long period of time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described with reference to the drawings shown as embodiments.

This embodiment is a speed control valve for meter-out control, and this speed control valve is basically a joint main body 1 formed in a T-shape and the joint main body 1 as shown in FIG. A needle valve 2 screwed into one end of the vertical member of
A cylindrical member 3 fixedly arranged coaxially with the needle valve 2 in the joint main body 1, an elastic diaphragm 4 externally inserted in the cylindrical member 3, and the elastic diaphragm 4
A support member 5 externally inserted into the tubular member 3 to receive the
The one-touch type tube connecting portion 6 provided on the lateral member constituting the joint main body 1 is provided.

As shown in FIG. 1, the joint main body 1 is constructed by mounting a resin horizontal member 11 on a metal vertical member 10. The inside of the vertical member 10 and the inside of the horizontal member 11 are arranged. And O-rings 12 and 13 are interposed between the vertical member 10 and the horizontal member 11 to ensure fluid tightness between them.

As shown in FIG. 1, the needle valve 2 comprises a valve shaft 20 and a lock nut 21 which locks the valve shaft 20 against the joint body 1 so that the valve shaft 20 cannot rotate.
Is an adjustment tool corresponding portion 22 arranged outside the joint main body 2 as shown in the figure, a tapered valve portion 23 formed at an end portion on the insertion side into the joint main body 1, and the adjustment tool corresponding portion 22. It has a male screw portion 24 formed between the tapered valve portion 23 and the tapered valve portion 23. The valve shaft 20 has an O-ring 2
5, the O-ring 25 prevents the fluid from leaking between the valve shaft 20 and the joint body 1.

In this embodiment, as shown in FIGS. 3 and 4, the gap between the tapered valve portion 23 and the tubular member 3 is the opening of the main flow path A.

As shown in FIG. 1, the tubular member 3 is a tubular member having an enlarged diameter portion 30 at its upper end portion, and is fixedly arranged coaxially with the needle valve 2 by a tubular holder 7. . As shown in FIG. 1, the cylinder holder 7 is a cylinder having a small diameter portion 70 and a large diameter portion 71.
A plurality of through holes 72, which form a plurality of flow paths, are formed in one.

As shown in FIGS. 1 to 3, the elastic diaphragm 4 has a cone shape formed of synthetic rubber, and has a relatively thick bottom wall portion 40 and a relatively thin cone-shaped piece portion 41. It consists of As shown in the figure, the tip of the cone-shaped piece portion 41 has a tapered surface 42 that inclines outward from the bottom wall portion 40 side toward the tip end side. 41
The buckling force is not applied directly. That is, as shown in FIGS. 3 and 4, the cone-shaped piece portion 41 is configured to be deformed in a mode in which it is curved with respect to air pressure.

The support member 5, as shown in FIGS.
It is composed of a relatively shallow cone-shaped cap, and is specifically formed from a bottom wall portion 50, a cone-shaped piece portion 51, and a rib 52 formed on the outer peripheral surface of the cone-shaped piece portion 51. ing. In this embodiment, as shown in FIG. 3, the side surface that constitutes the bottom wall portion 40 of the elastic diaphragm 4 by the support member 5, that is, the side wall portion excluding the large diameter portion of the elastic diaphragm 4 and the vicinity thereof. I am trying to receive it.

The elastic diaphragm 4 and the support member 5 described above are, as shown in FIG. 1, enlarged diameter portions 30 of the cylindrical member 3.
The cylinder holder 6 is attached so as not to move in such a manner as to be sandwiched by the cylinder holder 6.

The tube connecting portion 6 is, as shown in FIG.
A well-known one-touch type that allows easy tube attachment / detachment, that is, you only have to push the tube to connect the tube, and to remove the tube, just push the operation tube 60 and pull the tube. Has been done.

In the speed control valve of this embodiment, the outer peripheral surface portion of the elastic diaphragm 4 excluding the large diameter portion and the vicinity thereof is received by the supporting member 5 over the entire circumference without interruption. Like the speed control valve described in the column
The elastic diaphragm does not deform in a complicated manner in the circumferential and radial directions. That is, in this speed control valve, the cone-shaped piece portion 41 only deforms in such a manner that the diameter of the cone-shaped portion 41 is uniformly expanded and contracted over the entire circumference. Therefore, the elastic diaphragm 4 is not damaged in a short period of time, and the speed control valve can be used for a long period of time. Here, FIG. 5 shows a stress distribution when the elastic diaphragm 4 which is not received by the support member 5 is mounted, and FIG. 6 is a diagram in which air pressure acts on the elastic diaphragm 4 which is not received by the support member 5 and The stress distribution when the large-diameter part of the strip-shaped part 41 and its vicinity expand in diameter is shown.

A comparison of FIGS. 5 and 6 reveals that a large deformation and stress are generated at the base end portion of the cone-shaped piece portion 41, that is, the portion A shown in FIG. 6 due to the action of air pressure.

Therefore, there is no portion where a large stress is generated by receiving the entire circumference of the portion A by the support member 5. This is because the portion other than the portion A of the cone-shaped piece portion 41 is easily deformed, and stress concentration does not occur as can be seen from FIGS. 5 and 6. That is, when the structure of the pipe joint of this embodiment is adopted, the elastic diaphragm 4 is not damaged for a long period of time.

Further, in this speed control valve, when air is pressure-fed from the air source to the air equipment side through the tube, as shown in FIG. 3, the pressure reduces the diameter of the cone-shaped piece portion 41. Then, the bypass flow path B is opened, and conversely, when the air is discharged from the air equipment, as shown in FIG. 4, the diameter of the cone-shaped piece portion 41 is expanded by the pressure of the air. As a result, the bypass flow path B is closed.

Needless to say, even when the present invention is applied to a control valve for meter-in control, instead of the speed control valve of the above embodiment, the same effect can be obtained.

[0027]

From the contents described in the above-mentioned action column, a speed control valve that can be used for a long period of time could be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a speed control valve according to an embodiment of the present invention.

FIG. 2 is a perspective view of an elastic diaphragm and a supporting member of the speed control valve.

FIG. 3 is a cross-sectional view showing a state of an elastic diaphragm in the speed control valve when air is supplied from an air source to a device.

FIG. 4 is a cross-sectional view showing a state of an elastic diaphragm in the speed control valve when air is discharged from a device.

FIG. 5 is a diagram showing a stress distribution when an elastic diaphragm that is not received by a support member is attached.

FIG. 6 is a view showing a stress distribution when air pressure acts on an elastic diaphragm that is not received by a support member and a large diameter portion of a cone-shaped piece portion and its vicinity expand in diameter.

FIG. 7 is a sectional view of a conventional speed control valve.

FIG. 8 is a sectional view of a supporting member used in a conventional speed control valve.

FIG. 9 is a cross-sectional view of an elastic diaphragm used in a conventional speed control valve.

FIG. 10 is a cross-sectional view when air pressure acts on the elastic diaphragm of the conventional speed control valve from the large diameter portion side toward the small diameter portion side.

[Explanation of symbols]

 1 Joint Main Body 2 Needle Valve 3 Cylindrical Member 4 Elastic Diaphragm 5 Support Member

Claims (2)

[Claims] 1. The amount of air supplied to an air device per unit time is adjusted by inserting a needle valve (2) into a flow path in a tubular member (3) supported and fixed inside a joint main body (1). The tubular member (3) is provided with a substantially cone-shaped elastic diaphragm (4) in the flow path formed between the inner wall of the joint main body (1) and the outer wall of the tubular member (3). A speed control valve which is provided in a manner to be externally inserted to form a check valve, the speed control valve being provided in a manner to be externally inserted in the tubular member (3) and having a large diameter portion of the elastic diaphragm (4) and its vicinity. A speed control valve comprising a cap-shaped support member (5) that receives the outer peripheral surface portion except the entire circumference without interruption. 2. The velocity according to claim 1, wherein the large-diameter side end surface of the elastic diaphragm (4) is a tapered surface inclined from the large-diameter side to the small-diameter side from the outer peripheral surface toward the inner peripheral surface. Control valve.