JPH074376Y2 - Poppet valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a poppet valve, and more particularly to a poppet valve capable of remote proportional control.

[0002]

2. Description of the Related Art A poppet valve is widely used because of its simple mechanism. Conventionally, however, the poppet valve has been opened and closed by controlling the pressure of the back pressure chamber of the poppet valve with an electromagnetic opening / closing valve. .

[0003]

However, in the prior art as described above, since the so-called opening / closing control simply opens / closes the poppet itself, proportional control for continuously adjusting the opening is impossible, and the poppet is not possible. Since the shock when opening and closing is large, the actuator suddenly starts and stops suddenly and the prescribed operation cannot be performed smoothly.

The present invention eliminates such drawbacks, and its purpose is to provide a remotely controllable poppet valve capable of adjusting the opening of the poppet in proportion to the pressure oil acting on the poppet with a simple mechanism. To do.

[0005]

DISCLOSURE OF THE INVENTION The present invention is directed to a valve main body having a conduit communicating with a tank, an inflow passage and an outflow passage, and a pressure receiving area on the inflow side of a fluid which is slidably fitted to the valve main body. The pressure receiving area on the back side is made larger, the inflow path and the outflow path are separated by a conical part, and the back side and the inflow side have the same diameter or the inflow side is slightly larger than the back side. The shaft end has a bottomed tubular shape with one end closed, which is slidably fitted to the valve body corresponding to the poppet open to the pipe line communicating with the tank and the shaft part on the back side of the poppet. The cylindrical outer side is provided with two lands and one annular groove between the lands, and the cylindrical outer side and the inner side are connected to a tank connected to a tank, and a valve main body. And a piston for slidably fitted to the sleeve and contacting the sleeve to move the sleeve. And down, a spring the other end contact with one end closed bottom surface of the sleeve in contact with the shaft portion of the back side of the poppet, pilot pressure acting on the piston
The sleeve, which is moved lower by the piston, is
With the ring in contact with the hole end of the valve body
The back side and the inflow side of the poppet and the three
Valve for communicating via the annular groove provided in the valve
A pipeline that is drilled in the body and a pyrometer that acts on the piston.
As the contact pressure increases, the slip force is resisted against the spring force.
Move the probe to the poppet side and move the back of the poppet.
The surface side is provided through one of the lands provided on the sleeve.
The poppet provided on the valve body for communicating with the tank.
Through the rear side of the sleeve and the annular groove of the sleeve.
It consists of a road and a road .

[0006]

When the inflow passage is closed by the poppet, the pressure oil in the inflow passage acts on the back chamber, and at this time, the other end of the conduit opening on one side to the back chamber is closed by the land of the sleeve and the back face against the poppet. Since the pressure receiving area on the side is larger than the pressure receiving area on the inflow side, the poppet is pushed forward (to the right in the figure) and the conical portion of the poppet and the valve body close the inflow passage.

When pilot pressure oil is applied to the piston,
Since the piston moves to the right and the sleeve moves to the right against the spring, the pressure oil in the rear chamber is discharged to the tank via the pipe and the sleeve. Therefore poppet to retract by being pushed by the pressurized oil inlet channel (leftward in the drawing), communicating with the outflow path inlet channel opens, pressure oil flows to the outflow path from the inlet channel.

At this time, when the poppet retracts, the spring bends and stops at a position balanced with the hydraulic pressure acting on the piston. That is, the stop position of the sleeve is a position proportional to the hydraulic pressure acting on the piston. Since the position of the poppet is controlled by the piston in this way, when the hydraulic pressure acting on the piston is changed, the opening degree of the poppet is adjusted and proportional control is performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments. The valve main body 10 is divided into two main bodies 11 and 12 for easy assembly. In the figure, the conical portion 13 is on the right side and the shaft portion 14 on the left side and the right side are the same diameter or the right side is slightly larger than the left side. A poppet 15 having 14A is movably inserted into holes 16 and 16A formed in the main body 11.

A piston 22 which is moved by pilot pressure oil (not shown) is inserted in the left side of the main body 12 in the direction of the arrow. The piston 22 is in contact with the right side of the piston 22 and is bored in the main body 12 to the outside. Two lands 25a, 25
A cylindrical sleeve 26 having a bottom having one annular groove 24 is movably inserted between b and the lands 25a, 25b, and the bottom surface of the sleeve 26 (left side in FIG. 1) and the poppet 15 are inserted. A spring 28 is provided between the spring 28 and a washer 27 attached to the end of the shaft portion 14, and the left end surface of the sleeve 26 is in contact with the right end of the piston 22 by the spring force of the spring 28.

The opening at the other end of the conduit 29 having one end opened to the back chamber 19 is in the state shown in the drawing (when the pushing force of the piston 22 and the spring force of the spring 28 are in balance).
6 land 25b is engaged. The right end surface of the shaft portion 14A of the poppet 15 is opened to the tank 32 by the chamber 30 and the pipe line 31, and the hole 23 of the main body 12 is formed in the pipe line 3.
It is opened to the tank 32 by 3.

Further, the diameter of the opening of the conduit 29 on the side of the hole 23 and the width of the second land 25b of the sleeve 26 are formed to have substantially the same size in order to improve the followability of the sleeve 26. The opening of the pipe 29 is connected to the inflow passage 21 or the tank 32 depending on the balance between the force of the piston 22 and the force of the spring 28.

In addition, in the annular groove 24 of the sleeve 26, the inflow passage 2 from the pipe passage 44 provided in the main bodies 11 and 12.
The pressure oil of No. 1 acts, and the width of the annular groove 24 communicates with both the opening of the conduit 29 on the hole 23 side and the opening of the conduit 44 on the hole 23 side when the sleeve 26 moves. It is dimensioned to be retained. The sleeve 26 has a hole 47 for communicating the tank 32 with the bottomed oil chamber of the sleeve 26. A collar 34 slidably supports the shaft portion 14 and is attached to the main body 12. 35
Is an outflow passage for pressure oil provided in the main body 11.

Next, the operation of the embodiment of the present invention will be described. When the pilot pressure oil that acts on the piston 22 is low, the sleeve 26 is moved by the force of the spring 28 to the position where it abuts the left end in the hole 23 while contacting the piston 22. Therefore, the pressure oil in the inflow passage 21 is supplied to the passage 44,
From the annular groove 24 and the conduit 29 of the sleeve 26 to the rear chamber 19
It is in communication .

Therefore, the inflow passage 21, the passage 44, and the annular groove 2
4, the pipe line 29 and the back chamber 19 have the same pressure, and the cross-sectional area of the poppet 15 on the side of the inflow passage 21 and the back chamber 19 are
The poppet 15 is pushed to the right in relation to the side cross-sectional area, and the conical portion 13 of the poppet 15 blocks and separates the inflow passage 21 and the outflow passage 35.

The pilot pressure rises, the piston 22 moves the sleeve 26 to the right, and the pushing force of the piston 22 due to the pilot pressure and the spring force of the spring 28 are balanced, that is, the land 25b of the sleeve 26 is a pipe. When the opening of the hole 23 of the passage 29 is closed and further moved to the right by a small amount, a "small passage" is formed at the left end of the land 25b and the opening of the conduit 29, so that the rear chamber 19 moves to the tank 32. The pressure in the rear chamber 19 is lower than the pressure in the inflow passage 21, and the poppet 15 moves leftward due to the pressure difference between the rear chamber 19 and the inflow passage 21. As a result, the force of the spring 28 increases, and this force is transmitted to the sleeve 26, so that the sleeve 26 tries to move to the left against the force from the piston 22.

By the way, since the width of the land 25b and the diameter of the opening of the conduit 29 on the side of the hole 23 are substantially equal to each other, the adaptability of the sleeve 26 is good and when the sleeve 26 moves to the left, the rear chamber 19 becomes a tank. Since the poppet 15 tries to move to the right again because it is connected to the passage 44, that is, the inflow passage 21 at the same time as being blocked from 32, it is finally positioned in a state where the force of the piston 22 and the force of the spring 28 are balanced. It That is, as the pilot pressure acting on the piston 22 rises, the reaction force of the spring 28 that balances with the pilot pressure also rises, and the poppet 15 that is proportional to the pilot pressure acting on the piston 22 in order to raise the reaction force of the spring 28. Moves to the left.

[0018]

[Effects of the Invention] In the present invention, the oil passage of the back chamber is switched by the sleeve that moves the poppet through the piston, so that the pressure oil in the back chamber is closed or the pressure oil acts to move the poppet forward. The valve was closed, and the back chamber communicated with the tank so that the poppet retracted to open the valve. Therefore, proportional control is possible because the valve opening is determined according to the distance the piston moves.
Further, since the movement of the poppet is hydraulic, there is an advantage that a shock is small.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

 10 valve body 11 body 12 body 13 conical portion 14 shaft portion 14A shaft portion 15 poppet 16 hole 16A hole 17 hole 19 back chamber 21 inflow passage 22 piston 23 hole 24 annular groove 25a land 25b land 26 sleeve 27 washer 28 spring 29 conduit 30 chambers 31 pipes 32 tanks 33 pipes 34 collars 35 outflow passages 44 passages 47 holes

Claims (1)

[Scope of utility model registration request] 1. A valve main body provided with a pipe line communicating with a tank, an inflow passage and an outflow passage, and a pressure receiving area on the back side larger than a pressure receiving area on the inflow side of a fluid which is slidably fitted to the valve main body. The inflow path and the outflow path are separated by a conical portion, and the back side and the inflow side have the same diameter or the inflow side is slightly larger than the back side, and the back side and the inflow side are provided. The shaft end has a bottomed tubular shape with a poppet that is open to a conduit communicating with the tank and a slidably fitted to the valve body that corresponds to the shaft portion on the back side of the poppet and that has one end closed. And, the outer side of the cylinder is provided with two lands and one annular groove between the lands, and the outer side and the inner side of the cylinder are sleeves communicating with the pipeline connected to the tank, The valve body is slidably fitted into the valve body and is in contact with the sleeve. A piston to move the sleeve,
One end is in contact with the bottom surface of the sleeve and the other end is the poppet
A spring in contact with the shaft portion of the rear side, the piston
The pilot pressure acting on the engine is low and the piston moves
The sleeve causes the valve body to move by the spring.
The back end of the poppet in contact with the hole end of the
And through the annular groove provided in the inflow side and the sleeve.
And a pipe line formed in the valve body for communicating with each other.
As the pilot pressure acting on the piston increases,
Move the sleeve to the poppet side against the pulling force.
And move the poppet back side to the sleeve
In order to communicate with the tank through one land
The back side of the poppet and the three provided on the valve body.
A poppet valve comprising a passage opening into the annular groove of the bush .