JPS6383479A - Flow control valve - Google Patents

Abstract

PURPOSE:To reduce a flow control valve to a small size by providing a flow adjusting ring, the position of which can be controlled in the axial direction of a sleeve. CONSTITUTION:Connecting taper screws 21, 22 are formed on a sleeve 20 connected in a pipe arrangement for connecting a direction control valve 11 and a cylinder device 12. The sleeve 20 is provided with a one-way valve 24. Bypass passages 30, 31 piercing in the radial direction are bored in the wall surface of the sleeve 20, and a pair of O-rings 32, 33 are fitted to the outsides thereof. A flow adjusting ring 34 is formed on the O-rings 32, 33 in such a manner as to elastically come in contact therewith, thereby forming an annular limit passage 36. The engaging position of the ring 34 with a screw 35 is changed to vary the flow passage area of the limit passage 36.

Description

[Detailed description of the invention] "Technical field" The present invention relates to a flow control valve that changes a flow path area.

"Prior art and its problems" Flow control valves are basically devices with variable flow path areas and have various uses. For example, when used as a stop control valve for a cylinder, it is used to restrict the flow path area of fluid discharged from the pressure chamber of the cylinder.

By the way, conventional flow control valves are generally of the needle valve type, in which the valve body supported by the valve housing is movable in its axial direction, and the distance from the valve seat is variable. However, such a flow control valve composed of a valve body that moves in the axial direction and a valve seat requires the needle valve to be installed perpendicularly or intersectingly with respect to the fluid flow direction, so it is difficult to increase the size. The problem was that it was unavoidable.

``Object of the Invention'' The present invention is based on a new idea that departs from the conventional technical concept of flow control valves in which the valve body is brought into contact with and separated from the valve valve.
Particularly, the present invention is characterized by obtaining a flow control valve that is small in size and can easily adjust the flow rate.It is an object of the present invention to obtain a flow control valve that requires only a slight increase in the outer diameter of a cylindrical body through which fluid is to flow. shall be.

"Summary of the Invention" The present invention forms a restriction passage between the outer surface of a cylindrical body through which fluid flows and the inner surface of a flow rate adjustment ring, and adjusts the area of this restriction passage by adjusting the axial position of the flow rate adjustment ring. It was completed based on the idea that it is possible. That is, in the present invention, a flow path blocking or restricting means is provided in a cylinder through which a fluid is to flow, and detour passages passing through the cylinder in the radial direction are formed before and after the flow path blocking or restricting means. A flow rate adjusting ring is provided on the outer periphery of the cylindrical body to form a restriction passage communicating with the detour passage between the cylindrical body and the outer periphery of the cylindrical body, and the position of the flow rate adjusting ring is adjustable in the axial direction of the cylindrical body. Additionally, the shape of the inner surface of the flow rate adjustment ring and the outer surface of the cylindrical body are set so that the flow area of the restriction passage changes as the position of the flow rate adjustment ring is adjusted in the axial direction.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. This embodiment is an example in which the present invention is applied to a speed control valve. As mentioned above, the speed control valve] 0 is inserted between the directional control valve 11 that controls the pressure fluid from the pump P and the pressure chamber 13 of the cylinder device 12, and the speed control valve 0 is inserted between the directional control valve 11 that controls the pressure fluid from the pump P and the pressure chamber 13 of the cylinder device The free flow V in the direction of the chamber 13 flows substantially without restricting the flow path, and the controlled flow C of fluid discharged from the pressure chamber 13 restricts the flow path.

The speed control valve 10 of the present invention includes a direction control valve 1
This can be accomplished by adding a slight configuration to the cylinder body 20 that is connected in the pipe that connects the cylinder device 1 and the cylinder device 12.

Reference numerals 21 and 22 denote connection tapers for pipes formed at both ends of the cylindrical body 20. A one-way valve 24 is provided approximately at the center of the cylinder body 20.
is provided. This one-way valve 24 has a valve seat 25,
A movable valve body 26 that can move toward and away from the valve seat 25, and a tension spring 27 that allows the movable valve body 268 to be seated on the valve holder 25 at all times.
It has The tension spring 27 has its both ends hooked to a fixed spring hook 28 and a movable valve body 26. According to this one-way valve 24, the free flow V bends the tension spring 27 to move the movable valve body 26 to the N1 seat from the valve seat 25, but the controlled flow C causes the movable valve body 26 to come into elastic contact with the valve seat 25. Therefore, for the controlled flow C, it acts as a flow path blocking means.

Detour passages 30 and 31 are bored in the wall of the cylindrical body 20, located before and after the one-way valve 24, and passing through in the radial direction. This detour passage 3 is provided on the outer periphery of the cylinder body 20.
A pair of O-rings 32, 33 are fitted on the outer side of the O-rings 32, 33, and a thread 35 is formed on the O-rings 32, 33, into which a flow rate adjustment ring 34 is screwed. Therefore, the flow rate adjustment ring 34 forms an annular restriction passage 36 blocked by the O-rings 32 and 33 between the flow rate adjustment ring 34 and the outer periphery of the cylinder 20, and the position of the flow rate adjustment ring 34 is determined by the screw thread relative to the screw 35. By changing the alignment,
It can be changed.

The outer peripheral surface of the cylindrical body 20 is formed in a tapered shape between the detour passages 30 and 31.
4 has a stepped portion 38 facing the tapered surface 37.
is formed. Figure 2 shows this tapered surface 37 and the stepped portion 3.
8 is enlarged and exaggerated, and the step 38
It can be seen that when the ? That is, the flow area of the restriction passage 36 can be adjusted by adjusting the axial position of the flow rate adjustment ring 34.

Note that 40 is a lock nut for locking the flow rate adjustment ring 34 after adjustment.

The present speed control valve 10 having the above-mentioned configuration is such that the free flow V flows without being substantially throttled when the one-way valve 24 is opened, and the flow path area of the controlled flow C is determined by the axial position of the flow rate adjustment ring 34. Can be controlled by That is, if the position of the flow rate adjustment ring 34 is changed so that the stepped portion 38 approaches the tapered surface 37 of the cylinder body 20, the flow area of the restriction passage 36 becomes narrower, and the return of the piston 14 of the cylinder arrangement=12 is reduced. Conversely, if the position of the flow rate adjustment ring 34 is adjusted in a direction that moves the stepped portion 38 away from the Taber surface 37, the return of the piston 14 will become faster.

Note that the relationship between the tapered surface 37 and the stepped portion 38 may be reversed, that is, the stepped portion 38 is formed on the cylindrical body 20 side, and the flow rate adjusting ring 3
Even if the tapered surface 37 is formed on the fourth side, the situation is exactly the same. In addition, the shapes of the outer surface of the cylinder 20 and the inner surface of the flow rate adjustment ring 34 are determined by adjusting the position of the flow rate adjustment ring 34 in the axial direction.
Any device may be used as long as it can change the area of the restriction passage 36.

Further, a flow rate scale is provided on the outer circumference of the flow rate adjustment ring 34, and a flow rate scale is provided on the outer circumference of the flow rate adjustment ring 34.
0 is provided with an index corresponding to this flow rate scale, and the current flow j!
It is desirable to display (return speed).

When the present invention is used as a simple flow rate control valve other than speed control valve]○, the one-way valve 2/I is replaced with a simple flow path blocking wall or a flow rate limiting wall having an orifice that ensures a minimum flow rate. be able to.

"Effects of the Invention" As described above, the flow control valve of the present invention allows the flow path area to be changed by adjusting the axial position of the flow rate adjustment ring provided on the outside of the cylindrical body through which fluid flows. can.

Since the flow rate adjustment ring only needs to be slightly larger than the outer diameter of the cylinder, a small flow control valve can be obtained, and the cylinder has a
Since it can be easily connected to the piping, it is possible to obtain a speed control valve that requires almost no increase in installation space compared to the space without it. Also, the adjustment work should be done at the axially inner position If of the flow rate adjustment ring.
It is simple because all you have to do is change t.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the flow control valve of the present invention;
FIG. 2 is a cross-sectional view of a main part showing, in an exaggerated manner, how the flow area of the restriction passage changes. 10... Speed control valve, 11... Direction control valve, 20... Cylindrical body, 24... One-way valve, 30.3
1...Detour passage, 32.33...O ring, 34.
...Flow rate adjustment ring, 36...Restriction passage, 37...
Taber surface, 38... step part. Patent applicant: Fujikura Gomuerai Co., Ltd. Agent: Kunio Miura Shigeru Matsui Figure 1 Figure 2

Claims (2)

[Claims] (1) A cylindrical body through which fluid flows; a flow path blocking or restricting means provided within this cylindrical body; a bypass passage formed by penetrating the cylindrical body in the radial direction before and after the flow path blocking or restricting means; and the above-mentioned A flow rate adjustment ring whose position is adjustable in the axial direction of the cylinder is provided between the outer periphery of the cylinder and which forms a restriction passage communicating with the detour passage, and the inner surface of the flow rate adjustment ring and the outer surface of the cylinder are shaped is a flow control valve configured to change the flow area of the restriction passage as the flow rate adjustment ring is adjusted in the axial direction. (2) The flow control valve according to claim 1, wherein the flow path blocking or restricting means is a one-way valve.