JPS6151714B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to speed control valves, and more particularly to speed control valves used for speed control of suitable fluids, primarily pneumatic.

A fluid speed control valve is a valve that allows flow in both forward and reverse directions.In the forward direction, the fluid flows freely with as little resistance as possible, and in the reverse direction, the speed is controlled as a controlled flow with variable pressure and variable flow rate. It is something to do.

Conventionally, the fluid flow path within the speed control valve branches into two and then merges into one to form a complex flow path, with a check valve interposed in one flow path to control the flow of the other fluid. The flow path is formed with a regulating flow path using a needle or the like, and it is difficult to align the axis of the needle with the axis of the flow path not only in the shape of the flow path but also during assembly, which poses problems in the accuracy of speed control. Ta.

The present invention has been made in view of the above points, and provides a speed control valve that has a simple flow path shape, is easy to assemble, can perform precise control, and can also prevent deformation of an elastic diaphragm. The purpose is to form a flange having an appropriate number of communication holes at one end of the cylindrical support, and the cylindrical support is arranged in such a way that the axis of the cylindrical support extends in the flow direction of the fluid. The cylindrical support is fixed in the passageway, and a plurality of protrusions extending in the fluid flow direction at equal intervals are provided on the outer circumferential surface of the cylindrical support except for the outer circumferential edge and the edges near the outer circumferential edge. A cone-shaped elastic diaphragm is tightly fitted, the outer peripheral edge of the elastic diaphragm is brought into contact with the channel wall surface, and the outer surface of the shell protrusion is also brought into contact with the channel wall surface, so that the elastic diaphragm is placed in the channel. A needle is disposed on the side opposite to the flange of the cylindrical support so as to be able to protrude in and out of the cylindrical support with an adjustable amount of protrusion.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a substantially cylindrical main body, and a flow path 2 is formed by a through hole portion thereof. A female thread 3 is formed on the upper wall surface of the flow path 2, a communication path 4 extending in the circumferential direction is communicated with the center portion, and the diameter of the lower portion is enlarged. 5 is the communication path 4
This is a pipe joint fixed to the main body 1 so as to communicate with each other through its through hole. Reference numeral 6 denotes a cylindrical support, which is caulked to the inner wall of the lower end of the main body 1 at a flange 7 provided at one end thereof, so as to be located in the enlarged diameter portion of the flow path, and the axis thereof is coincides with the axis of Said collar part 7
A stepped portion 8 is formed in the body 1, and six communication holes 9 (however, only two (shown) is transparent. Reference numeral 10 denotes an elastic diaphragm made of synthetic rubber to have a cone shape, and this has a plurality of appropriately spaced protrusions extending in the fluid flow direction at equal intervals, except for the outer peripheral edge and the edges near the outer periphery. A cap member 12 having twelve protrusions 11 extending in the axial direction on the outer periphery is attached to the outer periphery so as to provide the same on the outer periphery. The elastic diaphragm 10 is connected to the cap member 12.
At the same time, the cap member 12 is tightly fitted into the cylindrical support 6 so that the upper surface of the cap member 12 comes into contact with the upper surface of the stepped portion 8 and the cone opens in the direction opposite to the flange portion 7. The outer peripheral edge of the elastic diaphragm 10 contacts the wall surface of the flow path 2, and each protrusion 1 of the cap member 12
The outer surface of the channel 1 is also in contact with the wall surface of the channel 2 .
The cap member 12 is desirably made of a material that can withstand the air pressure applied to the elastic diaphragm 10, such as synthetic resin or hard rubber. 13 is a presser ring;
In order to prevent the elastic diaphragm 10 to which the cap member 12 is attached from separating from the cylindrical support 6, the elastic diaphragm 10 is fitted onto the cylindrical support 6 and caulked at its upper end. Reference numeral 14 denotes an adjusting screw screwed into the female threaded portion 3, and an O-ring 15 is fitted into a groove formed on the lower circumferential surface of the adjusting screw. Reference numeral 16 denotes a needle having a tapered peripheral surface extending from the lower end of the adjusting screw 14 so that its axis coincides with the axis of the cylindrical support 6, and its tip end is opposite to the cylindrical support 6. By rotating the adjustment screw 14, the protrusion amount can be adjusted freely into and out of the end of the flange portion 7. 17 is the adjustment screw 1
It is a lock nut that is screwed into 4.

Next, the operation of this embodiment will be explained. When the airflow flows in the direction of the arrow shown in FIG. Flow flows freely from the communication passage 4 to the pipe joint 5. At this time, the airflow is rectified by the action of each protrusion 11, and the flow path 2
The gap with the wall surface is reliably maintained. Conversely, when the airflow flows in the direction of the arrow shown in FIG.
In order to press against the outer periphery of the needle 16 which is not supported by the needle 16 and its nearby end and the wall surface of the flow path 2, the air flow is caused by the needle 16, which is adjusted in advance to a desired plunge amount, and the cylindrical support 6 into which the needle plunges. It becomes a controlled flow that is controlled according to the width of the gap with the inner wall surface of the
The fluid flows within the flow path 2 from the communication path 4 direction to each communication hole 9 direction. At this time, the air pressure applied to the elastic diaphragm 10 is
The elastic diaphragm 10
It is not necessary to withstand air pressure by itself.

It should be noted that, as shown in FIG. 5, the elastic diaphragm 10' may be provided in the opposite direction to control the airflow in the opposite direction to that of the above-described embodiment. In this case, it is not necessary to provide the above-mentioned stepped portion 8 on the flange 7' of the cylindrical support 6', but the presser ring 10, which presses the elastic diaphragm 10' from below,
3', it is necessary to provide a presser ring 13'' for pressing the upper surface of the cap member 12', and to clamp the elastic diaphragm 10' and the cap member 12' from above and below with the pair of presser rings 13', 13''. . Further, in the first embodiment described above, each protrusion 11 to be provided on the outer periphery of the elastic diaphragm 10 is
Although the cap member 12 is provided on the elastic diaphragm 10, it is also possible to form the cap member 12 integrally with the elastic diaphragm 10.

In this way, according to the present invention, the following effects can be achieved. First, it is only necessary to provide a single flow path within the speed control valve, and there is no need to provide a complicated two-system branch flow path, making the main body extremely easy to manufacture. Second, since the elastic diaphragm is tightly fitted into the cylindrical support and flow control and backflow control are concentrated in this part, the configuration of the valve mechanism is simple, allowing for complete automation of assembly and cost reduction. It can be achieved. Thirdly, by providing a plurality of appropriate protrusions extending in the direction of fluid flow on the outer periphery of the elastic diaphragm, when the fluid flows in the free direction, this is rectified and the necessary flow space is secured in the flow path. However, when the fluid flows in the control direction, the pressure applied to the elastic diaphragm prevents its deformation and reduces fatigue. Fourth, since the structure of the valve mechanism is simple, its manufacture and assembly can be performed with high precision, while the opening and closing operations of the elastic diaphragm are reliably maintained over a long period of time by the action of each protrusion. Because of this, precise control of the fluid can be achieved over a long period of time.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to the above-mentioned embodiments, and can be modified in many ways without departing from the spirit of the invention. Of course.

[Brief explanation of the drawing]

The figure shows a preferred embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the entire center, in which a is a free flow state,
b indicates the flow state of the controlled flow. Figure 2 is a central vertical cross-sectional view of the elastic diaphragm, Figure 3 is a central vertical cross-sectional view of the cap member, Figure 4 is a plan view of the cap member fitted to the elastic diaphragm, and Figure 5 is a view of the speed control valve. FIG. 7 is a central vertical cross-sectional view showing another embodiment. 1, 1'... Body, 2, 2'... Channel, 3... Female threaded portion, 4... Communication path, 5... Pipe joint, 6, 6'... Cylindrical support, 7, 7 '...Flame part, 8...Step part, 9...Communication hole, 10, 10'
...Elastic diaphragm, 11,11'...Protrusion,
12, 12'... Cap member, 13, 13', 1
3″...Pressure ring, 14...Adjustment screw, 15...
...O-ring, 16, 16'...needle, 17...
…Rotsukunutsutto.

Claims (1)

[Claims] 1. In a valve mechanism that allows an appropriate fluid to flow in a flow path in one direction as a free flow and in the opposite direction as a controlled flow, a flange portion having an appropriate number of communication holes is formed at one end of a cylindrical support. The cylindrical support is fixed in the flow path at this flange so that its axis extends in the direction of fluid flow, and the outer peripheral surface of the cylindrical support has grooves spaced equally apart from each other in the direction of fluid flow. A cone-shaped elastic diaphragm provided on the outer circumferential surface except for the outer circumferential edge and the edges near the outer circumferential edge is tightly fitted with a plurality of appropriate protrusions extending to The outer surface of each protrusion is also brought into contact with the flow channel wall surface, and the protruding amount into the opposite end of the cylindrical support body in the flow channel opposite to the collar part is adjustable. A speed control valve characterized by having a needle arranged to project in and out.