JPS63254291A - Flow rate regulating valve - Google Patents

Abstract

PURPOSE:To arrange so as to easily obtain a controlled flow through a simple constitution by making a valve body a V shape where two small elastic pieces made of rubber or the like are made to face each other. CONSTITUTION:At a cylindrical main body 10 are axially provided penetrating holes which constitute a flow passage. An opening end 12 extends out with its outer perimeter diameter smaller than that of the main body 10 and at the same time, has an outer perimeter surface which is a tapered surface tapering off toward the tip. Also, a needle 20 is to advance/retreat freely in the flow passage of the main body 10 by means of a regulating nut 22. And penetrating holes 30 are provided at the side-surface of the needle 20. Also, a valve body 32 made of elastic rubber is inserted into the inner bottom surface of the flow passage portion 29 of the needle 20. This valve body 32 has thin small pieces 32a, 32b which are made to face each other in a V shape toward the tip from the base portion. When an air current flows in the direction of arrow marks a, the small pieces of the valve body 32 are deformed elastically and the current flows out as a free current, but a current in the direction of arrow marks b is deterred by means of small pieces 32a, 32b.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a flow control valve.

(Prior art) Fluid flow rate control valves allow flow in both forward and reverse directions using a valve body, allowing free flow to flow in the forward direction with as little resistance as possible, and controlling pressure and flow rate in the reverse direction. The velocity of the fluid is controlled by flowing a controlled flow. This flow control valve is disposed in an air cylinder or the like, and is used to control the moving speed of the cylinder by adjusting the control flow.

FIG. 3 shows an example of a conventional flow control valve. In the figure, 1 is a cylindrical main body, and a flow path is provided in the axial direction of the main body 1.

A needle 2 that moves back and forth in the axial direction is screwed into the top of the main body 1. Reference numeral 3 denotes an inner sleeve formed coaxially with the flow path inside the flow path opening at the base of the main body 1. Reference numeral 4 denotes a diaphragm made of an elastic body formed into a cone shape, and is inserted into the inner sleeve 4 with its enlarged diameter portion, which is the outer periphery of the cone, facing toward the opening of the main body 1. The outer peripheral edge of the diaphragm 4 elastically abuts against the inner surface of the flow path of the main body 1. 5
is a cap that regulates the upper surface of the diaphragm 4 and is engaged with the inner sleeve 3. Reference numeral 6 denotes a communicating portion provided through the side surface of the main body 1 to communicate the flow path, and 7 is a flow path pipe connected to this communicating portion 6.

The tapered part of the needle 2 that enters and exits the inner sleeve 3 is tapered, and is formed between the inner sleeve 3 and the tapered surface of the needle 2 when the needle 2 enters and exits the inner sleeve 3. By adjusting the gap, a controlled flow controlled to an appropriate flow rate flows out from the flow path pipe 7, and a free flow flows out from the opening of the main body 1.

This is because the diaphragm 4 acts to allow fluid to flow freely toward the opening at the base of the main body 1, and to prevent fluid from flowing out from the flow path tube 7.

(Problems to be Solved by the Invention) The conventional flow control valve described above is formed so that the free flow and the control flow can be controlled with a simple configuration, but the diaphragm 4 is cone-shaped. Because of this, the diaphragm 4 has to contract as a whole when allowing a free stream to flow, and due to insufficient elastic deformation, a sufficient flow rate of the free stream cannot be obtained. There is a problem in that the diaphragm becomes fatigued because it is deformed by force, resulting in poor durability.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to provide a simple structure that can provide a sufficient flow rate of the free stream and easily control the control flow. Our goal is to provide a flow control valve with outstanding durability.

(Means for solving problems) The present invention has the following configuration to achieve the above object.

In other words, in order to make the fluid flow as a free flow in one direction and as a controlled flow in the opposite direction, the flow rate of the controlled flow is controlled in one of the two flow channels provided in parallel in a part of the flow channel. In the flow control valve, the valve body is provided in a V-shape with two elastic pieces such as rubber facing each other, and When a non-return is performed on a flow path section having a rectangular cross section in which a shaped valve body is formed in the other flow path, the tip of the elastic piece comes into contact with one opposing wall surface of the flow path section. The side edge of the elastic piece slides against the other opposing wall surface to form a seal, and during free flow, the back pressure of the fluid presses the elastic piece and the tip is elastically deformed in the direction away from the one opposing wall surface of the channel section. It is characterized by being able to be completely stored.

(effect) Next, the present invention will be explained in detail.

When fluid flows toward the inner surface of the valve body in the other channel through which fluid flows, the tip of the elastic piece of the V-shaped valve body is pushed outward by the pressure of the fluid. The outer surface of the elastic piece comes into pressure contact with the wall surface of the flow path portion having a rectangular cross section to prevent the flow of fluid. As a result, the fluid flows out from the one channel as a controlled flow whose flow rate is controlled by the needle. Furthermore, when fluid flows in from the outer surface of the valve body, the back pressure of the fluid causes the elastic piece of the V-shaped valve body to elastically deform so that its tip separates from the wall of the flow path, creating a fluid circulation space. to allow the fluid to flow as a free stream. Due to the above-described effects, the fluid can be made to flow as a free flow in one direction and as a controlled flow in the opposite direction.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a flow control valve according to the present invention.

Reference numeral 10 denotes a substantially cylindrical main body, and a through hole provided in the axial direction constitutes a fluid flow path. Reference numeral 12 denotes an open end extending from the base of the main body 10, and its outer circumferential diameter extends to a smaller diameter than the outer circumferential diameter of the main body 10, and the outer circumferential surface is formed into a tapered surface toward the tip.

Reference numeral 14 denotes a tapered surface formed on the flow path surface at the base of the main body 1o, and a tapered surface is formed in the direction of the opening end 12.

Reference numeral 16 denotes a communication hole that communicates with a flow path in the main body 10 and is provided in the middle of the main body 10 in the circumferential direction.

A sleeve 18 extends from the communication hole 16 in a direction perpendicular to the main body. - 20 is a needle inserted into a through hole formed in the main body 10 from the top direction of the main body. Reference numeral 22 denotes an adjustment nut that is fitted and fixed to the top of the needle 20, and is screwed onto the outer peripheral surface of the top of the main body 10 to allow the needle 20 to move forward and backward within the flow path of the main body 10.

Reference numeral 24 denotes a gasket that is fitted into a groove formed on the outer circumferential surface of the top side of the needle 20, and seals between the inner surface of the flow path of the main body 10 and the circumferential surface of the needle 20.

From the part where the gasket 24 of the needle 20 is disposed toward the tip of the needle 20, the diameter is slightly smaller than the flow path diameter of the main body 10, and a gap 26 is formed between the flow path and the outer peripheral surface of the needle 20. is formed.

Reference numeral 28 denotes a tapered portion provided at the tip of the needle 20, and the outer peripheral surface thereof is tapered toward the tip.

Further, from the middle part of the needle 20 to the tip of the needle 20, a flow path part 29 having a rectangular cross section is formed, and 3
Reference numeral 0 denotes a through hole bored in a pair of opposing side surfaces of the flow path section 29. The wall surface of the channel portion 29 in which the through hole 30 is formed is formed to gradually become narrower toward the bottom surface.

Reference numeral 32 denotes a valve body made of elastic rubber that is inserted into the inner bottom surface of the flow path portion 29. Thin pieces 32a and 32b are formed in a V shape from the base of the valve body 32 so that the distance increases from the base toward the tip. It consists of facing each other. The widths of the small pieces 32a and 32b are set so that they can be inserted closely into the wall surface of the flow path portion 29. When the valve body 32 is inserted into the flow path portion 29, the outer surfaces of the small pieces 32a and 32b come into elastic contact with the wall surface of the flow path portion 29, thereby shielding the through hole 30. Further, a slight step is provided on the side wall near the bottom of the flow path section 29, and by inserting the valve body 32 into the bottom of the flow path section 29, the base of the valve body 32 engages with the step, and the needle The valve body 32 is configured to move together with the valve body 20.

FIG. 2 is a perspective view showing the needle 20 and the valve body 32. The figure shows a state in which the valve body 32 is removed from the needle 20 for illustrative purposes. When the valve body 32 is inserted into the flow path portion 29, the valve body 32 completely seals the through hole 30 and the flow path portion 29.

Numeral 34 is a fixing nut for fixing the set position of the adjustment nut 22, which supports the outer peripheral surface of the adjustment nut 22 and holds the adjustment nut 22 so that it does not rotate from the set position.

Reference numeral 4o denotes a cylindrical stud that receives the main body 10, and the inner surface from the middle to the upper part thereof is tapered so that the open end 12 of the main body 10 fits therein.

Further, a screw for screwing and fixing the stand 40 to a frame or the like is provided on the outer peripheral surface of the base of the stud 40, and an insert metal 42 is fixed to the inner peripheral surface of the base. This insert metal 42 has a hexagonal inner surface so that the stud 40 can be tightened with a hexagonal wrench or the like. 44 is a lock nut for tightening and fixing the main body 10 to the stud 40.

A taper ring 50 is fixed to the main body 10 and protrudes coaxially with the sleeve 18, and a collet chuck 52 is provided with its outer peripheral surface regulated by the inner surface of the taper ring 50.

Reference numeral 54 designates a tube serving as a flow path pipe inserted into the sleeve 18. The tube 54 is pressed against the collet chuck 52 which is regulated by the outer peripheral surface of the sleeve 18 and the taper ring 50, and is pressed against the sleeve 18.

Next, the operation of the above-described embodiment will be explained.

For example, when an air flow flows in the direction of arrow a in Fig. 1,
When the air flow passes through the communication hole 16 from the tube 54 and flows toward the through hole 30 of the needle 20, the small pieces 32a and 32b of the valve body 32 are pushed away from the wall surface of the flow path section 29 by the fluid pressure of the air flow. is elastically deformed, a gap is formed between the through hole 30 and the small pieces 32a and 32b, and the airflow passes through the flow path section 29 and flows from the open end 12 of the main body 10 in the direction of arrow a in the figure as a free flow. leak.

In addition, when the air flow flows in the direction of the arrow, the flow path portion 29
Inside, the small pieces 32a and 32b of the valve body 32 are pressed against the wall surface of the flow path section 29, and act to check the air flow, thereby preventing the air flow from flowing out from the through hole 30. As a result, the airflow is directed between the tapered portion 28 of the needle 20 and the body 1.
The flow flows out into the gap 26 from the gap between the tapered surfaces 14 of 0, and flows out from the communication hole 16 into the tube 54 in the direction indicated by the arrow as a controlled flow.

The flow rate of the control flow can be controlled by adjusting the amount by which the needle 20 moves in and out of the tapered surface 14 of the main body 10, that is, by adjusting the fluid circulation space formed between the needle 20 and the tapered surface 14.

In the flow rate control valve of this embodiment, the valve body 32 for controlling fluid flow is provided within the needle 20, so that a flow rate control valve with a simple configuration can be formed.

In addition, each member of the above-described embodiment, such as the main body 10, needle 20, lock nut 44, and adjustment nuts 1 to 22, can be easily formed by resin molding a synthetic resin having a predetermined strength. , assembly can be performed efficiently.

In the above embodiment, the V-shaped valve body 32 is installed inside the needle 20, but the method of using the valve body is not limited to this. This V-shaped valve body can be installed and used. For example, the channel wall surface in which the cone-shaped diaphragm 4 shown in FIG. 3 shown as a conventional example is installed may be provided with a rectangular cross section, and a V-shaped valve body may be provided so as to come into elastic contact with the channel wall surface.

(Effects of the Invention) According to the present invention, as described above, since the valve body provided in the flow control valve is formed in a V shape with the elastic pieces facing each other, the elastic pieces are easily deformed by the pressure of the fluid. Since the amount of deformation is large, the flow rate of fluid can be increased. Furthermore, since the elastic piece deforms simply in the linear direction, the strain caused during elastic deformation is small, and the durability of the valve body of the flow rate control valve can be further improved.

The present invention has been variously explained above using preferred embodiments, but the present invention is not limited to these embodiments.
Of course, many modifications can be made without departing from the spirit of the invention.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view showing a needle and a valve body, and FIG. 3 is a sectional view showing a conventional example. 1o... Main body, 14... Tapered surface, 20... Needle, 22... Adjustment nut, 24... Packing, 26... Gap, 28... Tapered part, 29.
...Flow path section, 30...Through hole, 32...Valve body, 40...Stat, 42...Insert metal,
44---Lock nut, 50... Taper ring, 52... Collet chuck, 54... Tube. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Control the flow rate of the controlled flow in one of the two flow channels installed in parallel in a part of the flow channel so that the fluid flows as a free flow in one direction and as a controlled flow in the opposite direction. In the flow control valve, the valve body is provided in a V shape with two elastic pieces such as rubber facing each other, and the valve body is provided in a V shape with two elastic pieces such as rubber facing each other. When a non-return is performed on a flow path section having a rectangular cross section in which a shaped valve body is formed in the other flow path, the tip of the elastic piece comes into contact with one opposing wall surface of the flow path section. The side edge of the elastic piece slides against the other opposing wall surface to form a seal, and during free flow, the back pressure of the fluid presses the elastic piece and the tip is elastically deformed in the direction away from the one opposing wall surface of the channel section. A flow control valve characterized by being completely retracted.