JPS5928138Y2 - pressure fluid power equipment - Google Patents

Description

[Detailed description of the invention] This invention continuously supplies pressure fluid into a cylinder, gives a reciprocating motion to a piston within the cylinder, and uses this reciprocating motion as a pressure fluid as a driving source for hydraulic pumps and various other devices. It relates to power plants.

Power devices that continuously supply pressurized fluid and control exhaust gas by moving the piston back and forth, which is endowed with return elasticity, and continuously reciprocate the piston, are well known, but all of them are structurally complex. In addition, there were various problems such as the slow movement cycle of the piston and poor discharge efficiency when used in pumps and the like.

The present invention was developed to solve the above-mentioned problems with conventional power units, and its purpose is to miniaturize the unit by providing a mechanism for controlling the supply and discharge of pressure fluid within the valve surface. It is an object of the present invention to provide an efficient power device which has a simplified structure, and which allows quick switching of supply and discharge of pressure fluid to and from the piston, and which allows the piston to advance and retreat at high speed.

Next, the details of an embodiment of the present invention will be explained based on the attached drawings as follows.

FIG. 1 shows the schematic structure of the power plant according to the present invention, and the second
Figures 5 to 5 show a concrete example of using the same as the above as a liquid pump.
This shows an example. In each figure, 1 is a cylinder whose both ends are sealed by valve casings 2 and 3, and inside there is a piston 6 that moves back and forth to partition the interior into two variable chambers 4 and 5. Incorporate it so that it can be moved freely.

One valve face 2 has an air supply port I for blowing pressurized fluid into one chamber 4, two exhaust valves 8 provided in parallel on both sides of the center, and an axial extension of the cylinder 1. A spool valve hole 9 that opens on one side of the chamber 4 along the line is provided, and the other valve surface 3 has a barrel 10 on the axial extension line of the cylinder 1, a liquid suction port 11, a liquid discharge port 12, An integrated suction and discharge valve body 13 is provided in a portion where the barrel 10, liquid suction port 11, and liquid discharge port 12 communicate with each other.

The structure of the exhaust valve 8 includes a small diameter hole 15 provided in the middle part of the valve surface 2 so as to communicate with the outside air via an exhaust hole 14, and a valve seat 16 formed at the outer end of the small diameter hole 15. A large-diameter hole 1T and a large-diameter recess 19 provided with a valve seat 18 formed on the inner end side are arranged in series, and the outer end of the large-diameter hole 17 is sealed with a valve cover 20, and the small-diameter hole 1T is sealed with a valve cover 20. A movable valve 21 is installed from the large diameter hole 15 to the large diameter hole 17.

The movable valve 21 has a valve stem 23 that fits loosely in the small diameter hole 15 and protrudes from the end face of a piston 22 that is slidably fitted in the large diameter hole 17. An elastic body 24 to be joined to the valve seat 18 is attached to the portion facing the valve seat 18.

The movable valve 21 has a length such that when the elastic body 24 is joined to the valve seat 18, the tip of the valve stem 23 is flush with the inner end surface of the valve surface 2, and a gap is formed between the piston 22 and the valve seat 16. When the piston 22 is in the forward position where it is in pressure contact with the valve seat 16, the tip of the valve stem 23 protrudes into the chamber 4, and the elastic body 24 separates from the valve seat 18 and connects with the chamber 4 through the recess 19. Small diameter hole 1
5 is a letter of communication.

The piston 6 in the cylinder 1 is always given return elasticity toward the one chamber 4 side by the elastic force 25 contracted in the other chamber 5, and the spool valve hole 9 is provided on the negative side. A spool valve stem 26 that is slidably fitted inside the valve stem 26 and a plunger 27 that is slidably fitted inside the bar 10 on the other side are fixed coaxially.

A conical portion 28 is formed at the tip of the spool valve rod 26, and a passage 29 is formed at the midway portion of the spool valve hole 9, at a position where the conical portion 28 faces when the piston 6 is advanced most toward the chamber 5 side, as shown in FIG. The rear end of the spool valve hole 9 is connected to the exhaust valve control chamber 30 of the large diameter hole 17 in the exhaust valve 8 through a passage 31 .

The cylinder 1 communicates with the chamber 5 when the piston 6 is in the most retracted position, and when the piston 1 moves slightly forward,
A discharge port 32 that is closed by the scar If of the piston 6 and a discharge port 33 that communicates with the chamber 5 and the outside air even when the piston 6 is in the most advanced position are formed.
2 communicates with the control chamber 30 of the exhaust valve 8 through a discharge hole 34 provided in the valve surface 2 and a discharge hole 35 provided in the cylinder 1.

The present invention has the above-mentioned structure, and high pressure gas is continuously blown into one chamber 4 from the air supply port I when the piston 6 is in the state shown in FIG.

The piston 6 compresses the bullet 25 and moves forward while blocking the discharge port 32 of the cylinder 1 with the outer periphery of the skirt, and the spool valve rod 26 attached to the piston 6 slides inside the spool valve hole 9. As it is pulled out, the plunger 27, which is also attached to the piston 6, enters the barzl 10,
This pressurizes the liquid in the bar 10, and the liquid pushes open the discharge side of the valve body 13 and flows out from the discharge port 13.

When the conical portion 28 of the spool valve rod 26, which sets the stroke of the piston 6, faces the communication portion between the spool valve hole 9 and the passage 29, that is, the piston 6 reaches the most advanced position as shown in FIGS. 4 and 5. Then, the passage 29 and the spool valve hole 9 are opened, and the high-pressure gas in the side chamber 4 flows into the spool valve hole 9 through the passage 29. Enter room 30.

Since the exhaust port 32 connected to the control chamber 30 is closed by the piston 6, the high pressure gas filling the control chamber 30 acts on the rear surface of the piston 22, moving the movable valve 21 forward.

When the piston 22 comes into contact with the valve seat 1'6K, the elastic body 24 separates from the valve seat 18, and the concave part 19 and the small diameter part 15 are unclosed to open the exhaust valve 8. The high-pressure gas being blown 1 is released into the outside air from the exhaust port 14.

For this reason, the pressure in the one chamber 4 is instantly reduced by the exhaust valve 8 and the discharge capacity relative to the amount of high-pressure gas blown, and the forward movement of the piston 6 is stopped.

On the other hand, at the same time as the pressure in the chamber 4 is reduced, the piston 6 is compressed by the compressed bullet 25.
Due to its restoring elasticity, it starts moving backwards.

As the piston 6 retreats, the plunger 27 is pulled out from inside the bar 10 and the inside becomes negative pressure, so the valve body 13
The suction valve is opened and the liquid flows into the cover sill 10 from the suction port 11.

As the piston 6 retreats, the spool valve rod 26 enters and retreats into the spool valve hole 9, closing the communication between the valve hole 9 and the passage 29.

Therefore, the high-pressure gas in the control chamber 30 of the exhaust valve 8 is trapped, and the exhaust valve 8 is kept open as shown in FIG. Since the gas is discharged from the discharge port 14 and maintained in a reduced pressure state, the piston 6 is rapidly retreated by the repulsive force of the bullet 25.

When the piston 6 reaches just before the end of its retraction, the discharge port 32 formed in the cylinder 1 is opened by the piston 6,
Therefore, the pipe pressure that was acting on the control chamber 30 of the exhaust valve 8 passes through the discharge hole 34.35 and from the other chamber 5 to the discharge port 33.
It is released outside of cylinder 1.

At the end of its retraction, the piston 6 comes into contact with the valve stem 23 of the exhaust valve 8 that projects into one of the chambers 4 and pushes the movable valve 21 .

The movable valve 21 moves backward due to the pressure, and the elastic body 24 presses against the valve seat 1.
8, the exhaust valve 8 is closed, and on the other hand, the high-pressure fluid inside the chamber 4 no longer flows out to the outside.

Simultaneously with the closing of the exhaust valve 8, the piston 6 moves forward again while compressing the bomb 25 by continuously blowing in high-pressure gas, and each part repeats the above operation and is moved by the plunger 27iC that reciprocates. It discharges liquid.

In the embodiment, an example was shown in which the reciprocating motion of the plunger 27 is used as a liquid pump, but the present invention is not limited to this in any way, and it goes without saying that it can be used as a drive source for various devices.

As described above, the present invention provides a power device that automatically reciprocates a piston by continuously supplying pressure fluid, and a pressure fluid inlet, an exhaust valve, and a spool are attached to the valve surface that closes one side of the cylinder. A valve hole is provided, and a spool valve stem that slides into the spool valve hole is attached to the piston, and the midway of the spool valve hole is connected to one chamber, and the back end of the spool valve hole is connected to the control chamber of the exhaust valve and the control chamber of the exhaust valve. Since the exhaust ports provided in the other chamber of the cylinder are connected to each other so as to be opened and closed by the piston, the exhaust valve can be controlled by the spool valve stem and spool valve hole, and the piston can be continuously reciprocated. Since the exhaust valve is switched quickly, the piston's forward and backward movement cycle becomes extremely fast.

In addition, since the mechanism that controls the piston's forward movement is built into one valve surface, the overall size can be reduced, and the structure is made up of the exhaust valve, spool valve stem, spool valve hole, and passage. This has excellent effects such as the ability to simplify the process.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the structure of the power device according to the present invention, Fig. 2 is a longitudinally folded front view showing a concrete example of using the above in a hydraulic pump, and Fig. 3 is along the line ■-■ in the second drawing. FIG. 4 is a cross-sectional view showing the piston moved forward, and FIG. 5 is a cross-sectional view taken along line IV- in FIG. 2.
It is a sectional view showing a state where the piston moves forward along V. 1...Cylinder, 2, 3...Valve surface, 4
...One room, 5...The other room, 6.
...Piston, I...Air supply port, 8...
...Exhaust valve, 9...Spool valve hole, 14...
...Exhaust hole, 21...Movable valve, 23...
... Valve rod, 25 ... Bullet machine, 26 ...
Spool valve stem, 27...Plunger, 29.
...Aisle, 30...Exhaust valve control room, 32
...Discharge port, 33...Discharge port, 34°35...Discharge hole.

Claims (1)

[Scope of utility model registration request] The piston that partitions the inside of the cylinder into two variable chambers is given return elasticity toward one chamber by a compression bullet, and the pressurized fluid in one chamber is automatically discharged by the movement of the piston, and the pressurized fluid is automatically discharged into the one chamber. In a power device that reciprocates a piston by continuous supply of pressurized fluid, a valve surface equipped with an air supply port to one chamber has a spool valve hole and a valve surface that opens and closes communication between one chamber and outside air. An exhaust valve is provided that closes when the piston moves toward the chamber side, and a spool valve stem that fits into the spool valve hole is provided in a protruding manner. A device consisting of a valve stem was connected in communication with one chamber through a passage, and the inner end of the spool valve hole was connected to the control chamber of the exhaust valve and the exhaust port provided in the other chamber so as to be opened and closed by a piston. A pressure fluid power device characterized by: