JPS6330666A - Flow control valve - Google Patents

Abstract

PURPOSE:To alter a passage area with a speed regulating member unshifted in the axial direction as well as make its regulation easily, by installing the speed regulating member possible for only speed regulation and unshifted in the axial direction, and installing the valve body formed in a rotor form, centering on a shaft in parallel with the turning shaft, in this speed regulating member as one body. CONSTITUTION:When a flow control valve 24 regulates speed of a speed regulating member 25 in utilizing a driver groove 30, a valve body 26 contacts or separates to or from a valve seat 27, whereby a passage area between both is altered to some extent. At the time of this speed regulation, this speed regulating member 25 will only rotate and never move in the axial direction so that a position (regulating position) of the driver groove 30 is constant and regulation is easy and, what is more, seal length (d) of a seal member 28 can be made smaller. And, since projection length of the speed regulating member 25 from a valve housing 20 is in no case changed, enlargement of the whole body will not be incurred. In addition, regulation of a flow rate is carried out at one turn of the speed regulating member 25 at most, so that it is easy enough.

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 area and have various uses. It is used to narrow down the flow area of the fluid discharged from the pressure chamber of the Schilling device.

By the way, in the conventional product, in order to make the flow path area variable, the valve body supported by the well housing is movable one distance in the axial direction, so that the distance relative to the valve pressure is variable. The valve body is typically threadedly coupled to the valve housing. However, when the valve element moves in the axial direction, the seal member that covers the movement path M is the main point, so the longer the axial movement distance, that is, the wider the flow rate adjustment range, the more the seal becomes becomes difficult. Also, if the valve body is threadedly connected to the valve housing, if it moves in the axial direction,
The adjustment (i2M) of the head changes (already
This head, which is not easy to use and protrudes from the valve housing, increases the overall size of the flow control valve.

``Object of the Invention'' In view of the above-mentioned circumstances, an object of the present invention is to obtain a flow control valve in which the valve body does not move in its axial direction.

"Summary of the Invention J The present invention provides a rotation adjustment member that can only be adjusted in rotation and does not move in the axial direction. It is characterized in that the distance between the valve body and the valve seat can be changed by % by integrally providing the valve body and rotating the rotation adjustment member.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. This embodiment is an embodiment in which the present invention is applied to the speed control valve described above. As described above, the speed control valve 10 is a directional control valve 1 that controls pressure fluid from the pump P.
] and the pressure chamber 13 of the cylinder assembly 12, the free flow V from the direction control valve 1 to the pressure chamber 13 flows substantially without restricting the flow path, and the pressure Room 1
The controlled flow C of fluid discharged from 3 throttles the flow path.

In the valve housing 20, between the boats 21 and 22,
An on-off valve 23 for free flow V and a flow control valve 24 for controlled flow C, which is a feature of the present invention, are provided. The on-off valve 23 has a valve body 23a pressed against a valve seat 23 by a compression spring 23b.
When the free flow V from the directional control valve 11 is applied via the boat 21, this free flow V
The force causes the valve body 21a to open and allow the water to flow into the boat 22.

On the other hand, the flow control valve 24 includes a rotation adjustment member 25, a valve body 26 integrally provided with the rotation adjustment member 25, and a valve seat 2.
7, the zero rotation adjustment member 25 includes a seal member 28 and a stop ring 29 on the well housing 20.
The head of the rotation adjustment member 25 faces the outer surface of the housing 20, and the rotation adjustment member 25 has a rotation adjustment member on the outer surface. A driver groove 30 is provided. Further, a valve body fixing part 31 coaxial with the rotation center axis S is provided at the inner end thereof, and the valve body 26 is fixed to this valve body fixing part 31.

In this example, the valve body 26 is made of a spherical body, and its center axis S is eccentric from the rotation center axis S by a distance β. Therefore, when the rotation adjustment member 25 is rotated, the valve body 26 moves toward and away from the valve seat 27, and the flow path area changes.

The valve body 26 can be of any shape other than a sphere as long as it has the shape of a rotating body having an axis st parallel to the central axis of rotation S. Figures 2 (A) and 2 (B) are examples of this, in which (A) shows a valve body 26 in the shape of an abacus sphere, and (B) shows a valve body 26 in the shape of a trapezoid in cross section, which is obtained by cutting an abacus sphere at its center. The valve seat 27 is
Depending on the shape of these valve bodies 26, the shape is determined so that when the valve body 26 approaches the maximum by adjusting the rotation angle of the rotation adjustment member 25, it can come into contact with the valve body 26 and close the flow path.

Therefore, when the main flow rate control well 24 having the above configuration uses 30% of the driver groove to adjust the rotation of the rotation adjustment member 25, NM occurs with respect to the valve body 26 or the valve seat 27, and the flow path area between the two changes. . When making this adjustment, the rotation adjusting member 2
Since the driver groove 30 only rotates and does not move in the axial direction, the adjustment position (adjustment position) of the driver groove 30 remains unchanged and is easy to adjust, and the seal length d of the seal member 28 is made small. be able to. Furthermore, since the protruding length of the rotation adjustment member 25 from the valve housing 20 does not change, the overall size does not increase.Rough adjustment of the flow rate can be performed by one rotation of the rotation adjustment member 25 at most. It is easy to adjust.

Although the present invention does not concern the material of each component,
If the valve body 26 is made of urethane rubber, for example, it can have excellent durability and adhesion to the valve seat 27 when fully opened. Also, depending on the material of the valve body 26,
The rotation adjustment member 25 and the valve body 26 can also be formed as one member from the same material.

"Effects of the Invention" As described above, the flow control valve of the present invention can change the flow path area using the rotation adjustment member that does not move in the axial direction. Therefore, it is possible to obtain a flow control valve that has a short seal length of the rotation adjustment member, does not change its adjustment position and protrusion amount, and is simple to adjust.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the flow control valve of the present invention;
FIGS. 2(A) and 2(8) are cross-sectional views of other examples of shapes of the valve body and valve seat. ]○... Speed control well, ]1... Direction control valve, 20... Valve housing, 24... Flow rate control valve, 25... Rotation adjustment member, 26... Valve body, 27... −
・Valve seat, 28...-Seal member, 29... Stop ring, 30... Tribar groove, 31... Valve body fixing part,
S: Rotation center axis, S: Valve body center axis.

Claims (1)

[Claims] In a flow control valve having a valve body that changes the flow path area by changing the distance from the valve seat, a rotation adjustment member that can only rotate and does not move in the axial direction is provided, and the rotation adjustment member is provided with a rotation adjustment member that is parallel to the rotation axis. 1. A flow control valve characterized in that a valve body in the shape of a rotating body centered on an axis is integrally provided, and the distance between the valve body and a valve seat is changed by rotating a rotation adjustment member.