JPH0942478A - Needle valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce resistance applied to an operation handle through a needle valve, improve operability of the needle valve, and prevent generation of malfunction in the operation of the needle valve. SOLUTION: A pair of needle valves 21, 22 are connected movably arranged in opposite directions through an inversed screw 27. Fluid pressure is applied to the needle valves 21, 22 in the direction so as to cancel each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle valve device for opening and closing a fluid pressure circuit such as a hydraulic circuit by attaching and detaching a cone-shaped needle valve to a valve seat.

[0002]

FIG. 2 shows an example of a needle valve device for manually opening and closing a high pressure hydraulic circuit. In FIG. 2, 1 is a valve housing, 2 is a cone-shaped needle valve, 3 is an operating handle, and 7 is the housing 1 described above.
A valve seat on which the needle valve 2 is attached / detached, 5 is a fluid (oil) inlet, and 6 is a fluid outlet.

In the above needle valve device, when the operation handle 3 is rotated, the screw 4 formed on the needle shaft 3a of the handle advances and retreats along the screw 11 on the housing side, so that the needle valve 2 moves to the valve seat 7 of the valve seat 7. Can be seated on or taken off. When the needle valve 2 is opened, the fluid in the inlet channel 5 passes through the opening of the needle valve 2 and exit channel 6
Be led to. As described above, the opening of the needle valve 2 is adjusted, the flow path is blocked, and the flow rate is adjusted.

However, in the above-mentioned conventional needle valve device, when a high pressure due to the hydraulic pressure from the inlet passage 5 is applied to the inlet side of the needle valve 2, this pressure acts on the needle valve 2 to cause the operation handle 3 to move. The force due to the pressure is applied in the axial direction.

When the operating handle 3 is operated from this state to open and close the needle valve 2, the axial force is applied to the screw portion 4,
11 and becomes a resistance force, the operation force of the operation handle 3 becomes extremely large, and it becomes difficult to open and close minutely by the needle valve 2. Further, due to the resistance force, the screw portions 4, 1
1 is fixed and becomes unusable. An object of the present invention is to reduce the resistance force acting on the operating handle via the needle valve, improve the operability of the needle valve, and prevent the occurrence of malfunction of the needle valve.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a pair of needle valves are connected via a reverse screw so that the needle valves can be moved in opposite directions and the directions of fluid pressure applied to the needle valves cancel each other. The gist of this is that the specific means is fixed to an operation handle screwed into a housing and rotated to open and close the first flow path from one inlet flow path to the outlet flow path. First to do
The needle valve is connected to the first needle valve via a reverse screw, and the second flow path from the other inlet flow path to the outlet flow path is opened and closed by being displaced in the opposite direction to the first needle valve. And a second needle valve for rotating the operating handle so that the first needle valve and the second needle valve are displaced in opposite directions to simultaneously open and close the first and second flow paths. In the configured needle valve device.

According to the above means, the fluid pressure from the first and second flow paths acts on the pair of first and second needle valves in directions opposite to each other. The axial forces of the needle valve will cancel each other out.

As a result, the resistance force acting on the operating handle from the needle valve becomes small, and even if a high fluid pressure is applied, the needle valve can be opened and closed smoothly by the operating handle, and a minute opening and closing operation of the valve can be performed. Very easy to do.

Preferably, the handle shaft of the operation handle is screwed into the housing, and the second needle valve is provided with a rotation stopping member. This ensures operation via the reverse screw.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a high-pressure hydraulic circuit opening / closing needle valve device according to an embodiment of the present invention.

In FIG. 1, 11 is a valve housing and 2 is a valve housing.
Reference numerals 1 and 22 are cone-shaped first and second needle valves, 3 is an operation handle, 3a is fixed to the operation handle 3, and a screw portion 4 is a screw 11 of the housing 11.
The handle shafts 71 and 72 screwed into a are valve seats on the housing 11 side on which the first and second needle valves 21 and 22 are seated.

The first needle valve 21 and the second needle valve 22 are mounted in opposite directions so that they move in opposite directions to be attached to and detached from the valve seats 71 and 72, and both are screwed on the handle shaft 3a side. 4, 11a are connected to each other via a reverse screw 37 which is rotated in the reverse direction.

Inside the housing 11, the first and second
A first inlet chamber 23 and a second inlet chamber 24 are formed corresponding to the needle valves 21 and 22, both inlet chambers being the fluid inlet 5
Is communicated to. 6 is a fluid outlet.

As a result, the first passage from the first inlet chamber 23 to the outlet chamber 6 via the first needle valve 21 and the second passage from the second inlet chamber 24 to the outlet chamber 6 via the second needle valve 22. And two fluid passages are constructed. Reference numeral 12 is a rotation stopping member for locking the rotation of the second needle valve 22. 26 is a cap of the housing 11, and 26 is a packing.

When a high-pressure fluid (oil) is flown through the needle valve device constructed as described above, the fluid flowing from the inlet 5 enters the first inlet chamber 23 and the second inlet chamber 24, and the fluid pressure by this fluid is increased. It acts on the first and second needle valves 21, 22.

At this time, since the needle valves 21 and 22 are arranged in directions opposite to each other, the force exerted on the needle valve by the fluid pressure is the first needle valve 2
The downward force is applied to the first side, and the upward force is applied to the second needle valve 22. Therefore, the two forces in the opposite directions cancel each other out, and the handle shaft 3 passes through the needle valves 21 and 22.
The axial force applied to a is extremely small, and the screw parts 4, 11a
The resistance acting on is also negligible.

[0017]

According to the present invention, a pair of needle valves are connected via a reverse screw so that the needle valves can be moved in opposite directions, and the fluid pressures applied to the needle valves are made to cancel each other. As a result, the resistance force acting on the operation handle connected to the needle valve becomes small.

Thus, even if a high fluid pressure is applied, the needle valve can be smoothly opened and closed and finely adjusted by the operation handle, the operability of the needle valve device is improved, and the axis of the needle valve is improved. It is also possible to prevent the occurrence of malfunction or damage due to sticking of the fitting portion such as the screw portion of the handle shaft due to the directional force.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a high-pressure oil passage needle valve device according to an embodiment of the present invention.

FIG. 2 is a corresponding view of FIG. 1 showing a conventional needle valve device.

[Explanation of symbols]

 3 Operation Handle 3a Handle Shaft 4, 11a Screw 5 Inlet 6 Outlet Chamber 11 Housing 12 Rotation Stopper 21 First Needle Valve 22 Second Needle Valve 23 First Inlet Chamber 24 Second Inlet Chamber

Claims (1)

[Claims] 1. A first needle valve which is fixed to an operation handle screwed into a housing and is rotated to open and close a first flow path from one inlet flow path to an outlet flow path, and the first needle. A second needle valve that is connected to the valve via a reverse screw and that is opened in the opposite direction to the first needle valve to open and close a second flow path from the other inlet flow path to the outlet flow path. , The first needle valve and the second needle valve are displaced in opposite directions by rotating the operation handle so that the first and second flow paths are simultaneously opened and closed. Needle valve device.