JPS5926802B2 - Self-acting pressure booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-acting pressure booster used in the field of fluid equipment.

In conventional pressure intensifiers, the large-diameter piston part and small-diameter rod part of the pressure intensifier piston are slidably fitted into the large-diameter hole and small-diameter hole provided in the pressure intensifier body, and the rod end of the piston part is fitted. A return side piston chamber is formed on the side, a feed side piston chamber is formed on the head end side, and a pressure increasing chamber is formed on the rod end side of the rod part, and the feed side piston chamber is used as an inflow port.
Since the pressure intensifier chamber is configured to communicate with each outflow port, when using only the pressure intensifiers connected in series in the middle of the cylinder's crop fluid supply piping, it is necessary to connect the cylinder's working fluid The amount of pressure intensifier is limited by the amount of working fluid pushed out by the pressure intensifier piston, and when the cylinder has a large volume, the pressure intensifier must be extremely large, which has the problem of greatly limiting its range of use.

Therefore, in reality, a sequence and check valve is connected in series in the middle of the supply side of the working fluid supply piping connected to the pressure intensifier, and a bypass piping is provided in parallel to this pressure intensifier and the sequence and check valve. A pilot check valve is connected in the middle of this bypass piping due to an increase in pressure on the return side of the cylinder, or a solenoid valve is connected in series in the middle of the supply side of the working fluid supply piping connected to a pressure intensifier. A bypass pipe is provided in parallel to the pressure vessel and the solenoid valve, a pilot check valve is connected in the middle of this bypass pipe, and a pressure switch is provided that detects the pressure on the sending side of the cylinder and operates the solenoid valve. The pressure intensifier is not operated while the main piston of the cylinder is moving (the pressure intensifier is operated only after the main piston of the cylinder has stopped).

However, when using the pressure booster as described above, various devices and piping must be connected in addition to the pressure booster connection, which is extremely troublesome to assemble and difficult to assemble in a narrow space. In addition, the number of parts required for the entire pressure booster increases, making handling complicated and increasing the overall price (which directly or indirectly limits the field of application of pressure boosters). Ta.

Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional structure, and by simply connecting the cylinder in series in the middle of the working fluid supply pipe and supplying the working fluid to this working fluid supply pipe, 2) It is possible to supply the necessary amount of working fluid necessary for the movement of the main piston of the cylinder,
Moreover, the pressure can be increased automatically after the main piston stops moving, and by simply switching the supply of working fluid to the working fluid supply piping to discharge, the working fluid on the feed side of the cylinder can be increased as required. It is an object of the present invention to provide a self-acting pressure intensifier that is capable of discharging as much as possible and has excellent operability and operability.

That is, in the self-acting pressure intensifier of the present invention, a large diameter hole and a small diameter hole are continuously provided in the pressure intensifier body, and a large diameter piston part and a small diameter rod part are inserted into these large diameter holes and small diameter holes. The piston part and rod part of the pressure booster piston are slidably fitted, respectively, to form a return side piston chamber on the rod end side and a feed side piston chamber on the head end side from the piston part in the large diameter hole. At the same time, a pressure intensification chamber is formed on the rod end side of the rod portion in the small diameter hole, and a communication hole is formed in the pressure intensification piston to communicate the feed side piston chamber and the pressure intensification chamber,
A hollow chamber is formed in the middle of this communication hole, and the communication hole between this hollow chamber and the feed side piston chamber is slidably fitted into the communication hole, and a relatively strong spring is used to support the pressure booster piston. Comparison of a movable valve seat that is biased toward the rod end side so as to contact the first step of the stopper and has a valve hole in the center, and a movable valve seat that is movably fitted into the communication hole on the rod end side from the movable valve seat. A pressure increase valve is provided, which is made up of a pressure increase valve element that can be biased toward a movable valve seat side so as to come into contact with a first stage of a stopper of a pressure increase piston to close a valve hole thereof by a weak spring;
The communication hole between the hollow chamber and the pressure boosting chamber includes a fixed valve seat that is integrated with the pressure booster piston and has a valve hole in the center, and a communication hole on the rod end side of the fixed valve seat. A check valve consisting of a check valve body that is movably fitted and is biased toward the fixed valve seat by a relatively weak spring to close the valve hole is provided, and the hollow chamber is used as an inflow port to increase pressure. The chambers are communicated with respective outflow ports, and furthermore, when the fluid pressure in the hollow chamber is below a predetermined pressure, the movable valve body is quenched by the first step of the stopper by a spring, and this movable valve body pushes up the pressure increasing valve body. After closing the pressure increase valve, the pressure increase valve body pushes up the check valve body to open the check valve, and when the fluid pressure exceeds a predetermined pressure, the movable valve body is moved toward the head end, and the pressure increase valve body is closed. After the check valve is closed by releasing the push-up of the check valve body, the pressure increase valve body comes into contact with the first stage of the stopper and opens the pressure increase valve. When the fluid pressure on the inlet side (hereinafter referred to as secondary pressure) in the connected pipe reaches a predetermined value, the pressure is automatically increased to increase the fluid pressure on the outlet side (hereinafter referred to as secondary pressure) to a predetermined magnification. The present invention is characterized in that it has a pressure increasing function that can increase the pressure, and a function that can be directly connected in series to a normal fluid pipe line or directly incorporated into a fluid operating device such as an actuator.

Further, the present invention is characterized in that it is integrated with the main cylinder.

Hereinafter, drawings showing embodiments of the present invention will be described in detail.

Incidentally, in the drawings of the embodiments, some parts of the drawings ignore assembly and manufacturing relationships for the sake of explanation, but it goes without saying that these parts can be changed as necessary.

Figures 1 and 2 show a first embodiment when implemented as a general-purpose type that can be widely applied.

1 is a pressure booster main body (hereinafter referred to as main body 1), which includes a cylinder tube 2 and a head end camp 3 fixed to the end of the cylinder tube 2.
and rod end camp 4.

This cylinder tube 2 has a large diameter hole 2a and a spring storage hole 2b.
and small-diameter holes 2c are provided in a stepwise manner, and the ratio of the diameters of the large-diameter holes 2a and the small-diameter holes 2c is set to a majority size according to a desired pressure increase ratio.

Further, the head end cap 3 includes a long central tube 5 that projects into the cylinder tube 2 along the same axis, and the distal end of the central tube 5 and the inflow port 6 are communicated through a fluid passage 7.

Further, the rod end cap 4 is provided with an outflow port 8.

9 is a hollow pressure increasing piston consisting of a large diameter piston part 9a and a small diameter rod part 9b;
b are fitted into the large diameter hole 2a and the small diameter hole 2c of the cylinder tube 20 so as to slide airtightly.

By fitting the pressure boosting piston 9, a side piston chamber 3 is returned from the piston portion 9a to the rod end side in the large diameter hole 2a.
7, a feed side piston chamber 40 is formed on the head end side, and a pressure increasing chamber B is formed in the small diameter hole 2c on the rod end side from the rod portion 9b.

This pressure increase piston 9 is formed with a communication hole that allows the feed side piston chamber 40 and the pressure increase chamber B to communicate with each other.

This communication hole is constituted by a large diameter hole 10, a sliding hole 13, a small diameter hole 14, a hollow chamber 18, and a valve hole 20 shown below.

Reference numeral 10 denotes a large diameter hole provided in the piston portion a of the pressure booster piston 9, into which a presser fitting 11 is fitted and fixed on the head end side (right side in Fig. 1), and the center tube 5 is inserted into the piston portion a. An annular hollow chamber 12 is formed at the center.

The presser metal fitting 11 has a sliding hole 13 in the center thereof having a diameter larger than that of the central tube 5, and the central tube 5 passes through the sliding hole 13.

Reference numeral 14 denotes a small diameter hole provided in the rod portion 9b of the pressure boosting piston 9, into which the tip of the center tube 5 is inserted, forming an annular hollow chamber 15 between the center tube 5 and the center tube 5.

A portion of the small diameter hole 14 on the rod end side (on the left side in FIG. 1) is formed to have a slightly larger diameter, and a one-step stopper portion 16 is provided in the middle.

Incidentally, this one-step stopper portion 16 may be formed of a notched groove or a convex piece.

Further, a portion of the small diameter hole 14 on the head end side is formed into a sliding hole 11 having a slightly larger diameter than the sliding hole 13 of the presser metal fitting 11.

Reference numeral 18 denotes a hollow chamber formed at the tip of the rond part 9b of the pressure boosting piston 90, and the rod end side is open. A portion of the valve seat 19 is partitioned and communicated through a valve hole 20 provided in the center of the valve seat 19.

Next, reference numeral 21 denotes a movable valve seat (hereinafter referred to as valve seat 21) housed in the hollow chamber 12 of the piston portion 9a, which protrudes from an engaging portion 21b having a flange 21a on the outer periphery and both end surfaces of this engaging portion 21b. Sliding parts 21c and 21d having the same axes as each other
The sliding portion 21c and the sliding portion 21d are connected to the sliding hole 17 in the pressure booster piston 9 and the sliding hole 13 in the presser fitting 11.
It is slidably fitted in an airtight manner.

This valve seat 21 has a valve hole 22 having a diameter larger than the diameter of the center tube 5 in the center thereof, and forms an annular communication path 23 between the valve hole 22 and the center tube 5 passing through the valve hole 22 .

This communication path 23 may be formed by providing a groove in the valve seat 21.

24 is a spring having a predetermined elastic force that is compressed and sealed between the collar 21a of the valve seat 21 and the holding fitting 11;
is biased to the left by the elastic force of the spring 24, and the engaging portion 21
The left end surface of b comes into contact with the first step part of the stopper (not shown) of the piston part 9a, and its position is regulated, but when the valve seat 21 receives a force large enough to overcome this spring 24, the valve seat 21 engages. The right end surface of the portion 21b is configured to slide by a stroke L1 until it comes into contact with the presser metal fitting 11.

25 is a cap-shaped pressure increasing valve body (hereinafter referred to as valve body 25) housed in the hollow chamber 15 of the rond part 9b, and has a sliding hole 26, which is connected to the tip of the hollow tube 5. is slidably fitted in an airtight manner.

At the left end of this valve body 25 is a valve hole 20 of the fixed valve seat 19.
The push-up protrusion 25a facing the valve seat 21 has an engaging flange 25b on its outer periphery that can be engaged with the stopper 16 of the small diameter hole 14, and its right end is airtightly engaged with the edge of the valve hole 22 of the valve seat 21. A taper portion 25c that can be combined is formed.

Further, a communication hole 27 is provided near the left end of the valve body 25, which communicates the sliding hole 26 with the external hollow chamber 15.
A communication passage 29 is formed between the valve body 25 and the inner surface of the small diameter hole 14 by making the diameter of the valve body 25 smaller than that of the small diameter hole 14 and providing a notched groove 28 in the engagement flange 25b portion on the outer periphery of the valve body 25. has been done.

Instead of forming the communication passage 29 by making the diameter of the valve body 25 smaller than the inner surface of the small diameter hole 14, it may be formed by providing a long groove on the outer periphery.

Reference numeral 30 denotes a spring with a weak elastic force compressed and sealed between the engagement flange 25b of the valve body 25 and the end face of the small diameter hole 14. The valve body 25 is biased to the right by the elastic force of this spring 30, and the right end Tapered portion 25 of
c is in contact with the valve seat 21 and its position is restricted, but the valve seat 2
1 slides to the right, the valve body 25 slides by a stroke L2 until the engagement collar 25b engages with the first step portion 16 of the stopper.

The pressure increase valve 31 is constituted by the valve seat 21 and the valve body 25 shown above.

Reference numeral 32 denotes a check valve body slidably fitted into the hollow chamber 18 at the tip of the rond part 9b, and has a tapered part 32a and a communication hole 32b at the right end.

Reference numeral 33 denotes a receiver which is fitted into the hollow chamber 18 and prevented from being pulled out with a snap ring 34, and 35 is a spring with a weak elastic force compressed and sealed between the receiver 34 and the check valve body 32. 32 is biased to the right by the elastic force of the spring 35, and its right end contacts the push-up projection 25aKg of the valve body 21 to restrict its position.

In this case, the check valve body 32 is in the state where the valve hole 20 is opened, but when the valve seat 21 and the valve body 25 slide to the right, the check valve body 32 slides to the right by a stroke L3, The tapered portion 32a is configured to airtightly engage the edge of the valve hole 20 of the valve seat 19.

The valve seat 19 and check valve body 32 shown above constitute a check valve.

Spring 24, 30 of the pressure increase valve 31 and spring 3 of the check valve
As is clear from the above, the size of 5 is such that when the fluid pressure in the hollow chamber is below a predetermined pressure, the movable valve body is brought into contact with the first step of the stopper by the spring, so that the movable valve body increases. After the pressure valve body is pushed up to close the pressure increase valve, the pressure increase valve body pushes up the check valve body to open the check valve, and when the fluid pressure exceeds a predetermined pressure, the movable valve body is moved to the head end side. After the pressure increase valve body releases the push-up of the check valve body and the check valve is closed, the pressure increase valve body contacts the first step of the stopper and opens the pressure increase valve, and each stroke Ll.

The relationship between L2 and L3 is set so that L1>L2≧L3.

Next, 36 is a return spring having a predetermined elastic force compressed and sealed in the return side piston chamber 37 of the pressure boosting piston 9 and the spring storage hole 2b, and 38 is a return spring that communicates the return side piston chamber 37 with the atmosphere. The ventilation hole 39 is the hollow chamber 1 of the piston part 9a.
2 is a vent hole that communicates with the return side piston chamber 37.

Note that a return side piston chamber 37 is used instead of the return spring 36.
The pressure increase piston 9 may be returned by supplying and discharging pressure fluid into the inside.

Reference numeral 40 indicates a feed-side piston chamber of the pressure boosting piston 9.

For the purpose of explanation, the right side of the check valve body 32 (
The chamber on the inlet side (inlet side) is designated as the primary pressure chamber A, and the chamber on the left side (outlet side) is designated as the secondary pressure chamber B.

Next, the operation of the pressure intensifier configured as described above will be explained in the case where it is installed in, for example, a pressure oil supply line to a press-in device.

First, in the pressure intensifier configured as described above, when pressure oil is not supplied from the supply port 6, the state shown in FIG. 1 occurs.

That is, the pressure increase piston 9 returns to the stroke end on the head end side by the elastic force of the return spring 24, and the valve seat 21 of the pressure increase valve 31 moves the left end surface of the engaging portion 21b into the hollow chamber 12 by the elastic force of the spring 24. It is in contact with the first step of the stopper on the inner surface.

Therefore, the taper portion 25c of the valve body 25 is connected to the valve hole 2 of the valve seat 21.
The valve hole 22 is brought into airtight contact with the hole edge of the valve hole 2 by the elastic force of the spring 30.
On the other hand, the push-up protrusion 25a pushes up the check valve body 32 against the elastic force of the spring 35, thereby opening the valve hole 20.

In this state, even when pressure oil is supplied from the inflow port 6, the primary pressure of the pressure oil in the primary pressure chamber A is at a predetermined set pressure P, that is, the pressure oil pushes the valve seat 21 against the elastic force of the spring 24. It is held as long as the pressure does not exceed that which causes it to slide to the right.

Next, when pressure oil is supplied from the inflow port 6 to operate the press-fitting device, this pressure oil passes through the fluid passage 7 in the central pipe 5 and enters the primary pressure chamber A, and then enters the valve hole 20 and the check valve. It enters the secondary pressure chamber B through the communication hole 32b of the body 32,
It flows out from the outflow port 8 and slides the press-fitting piston of the press-fitting device.

In this case, it flows inside the primary pressure chamber A.

Since the pressure oil only slides the unloaded press-fit piston, the primary pressure of the pressure oil in the primary pressure chamber A will not rise above the set pressure P (the pressure increase valve 31 is in a closed state). is retained.

Thereafter, when the press-fitting device comes into contact with the object to be press-fitted and a load is applied to the press-fitting piston, the primary pressure of the pressure oil in the primary pressure chamber A increases.

When the primary pressure of the pressure oil in the primary pressure chamber A rises above the set pressure P, this primary pressure acts on the left pressure receiving surface of the valve seat 21 either directly or indirectly through the valve body 25. This valve seat 21 is slid to the right against the elastic force of the spring 24.

When the valve seat 21 slides to the right in this way, the valve body 25 also slides to the right together with it, and thereby the pressing protrusion 25a releases the push-up of the check valve body 32.

Therefore, the check valve body 32 is slid to the right by the elastic force of the spring 35, and the tapered portion 32a is brought into airtight pressure contact with the valve seat 19, closing the valve hole 20 and restoring the check function.

Further, when the valve seat 21 is further slid to the right after that, the engaging flange 25b of the valve body 25 engages with the one-stage stopper portion 16, and the sliding of the valve body 25 is stopped. By sliding the seat 21 to the right, the valve seat 21 and the valve body 25 are separated, and the pressure increase valve 31 is opened.

Therefore, the pressure oil supplied into the primary pressure chamber A passes through the communication passage 29 formed on the outer periphery of the valve body 25 and the flow passage 23 formed on the inside of the valve seat 21 to the feed side piston chamber of the pressure boosting piston 9. 40.

On the other hand, even after the valve seat 21 is separated from the valve body 25, the sliding portion 21
Due to the difference in area between the end surfaces of the sliding portion 21d and the engaging portion 21b, the engaging portion 21b is further slid to the right, and the right end surface of the engaging portion 21b abuts against the presser metal fitting 11 to restrict its position.

When the check valve body 32 recovers the non-return function as described above and the pressure oil at the primary pressure flows into the feed side piston chamber 40,
The primary pressure of this pressure oil is the piston portion 9a of the pressure booster piston 9.
and increases the pressure of the pressure oil in the secondary pressure chamber B at a pressure ratio determined by the ratio of the cross-sectional areas of the piston portion 9a and the rond portion 9b.

The increased secondary pressure of the pressure oil in the secondary pressure chamber B acts on the press-in piston, and the pressure booster piston 9 slides to the left to perform a predetermined positive work, but when the positive work is completed, The pressure increasing piston 9 stops sliding as shown in FIG. 2, and this state is maintained.

In addition, when the gripping piston does not slide any further after gripping the workpiece, such as in a clamping device, the pressure increasing piston 9 does not slide significantly as in the above embodiment (
, the pressure oil in the secondary pressure chamber B is increased at the original position.

When the pressure booster piston 9 increases the pressure of the pressure oil in the secondary pressure chamber B as described above, the primary pressure of the pressure oil flowing into the feed side piston chamber 40 is the maximum supply pressure supplied to the inflow port 6 by a pump or the like. Under this maximum supply pressure, the pressure of the pressure oil in the secondary pressure chamber B is increased.

Next, when pressure oil is supplied from the inflow port 6 to maintain the increased pressure as described above, and the supply of pressure oil to this inflow port is switched to discharge to release the primary pressure, the primary pressure decreases. Then, the valve seat 21 of the pressure increase valve 31 is slid to the left by the elastic force of the spring 24 and returned to its original position.

Further, the valve body 25 is also slid to the left and returned to its original position, so that the push-up protrusion 25a pushes up the check valve body 32 against the spring 35 to open the valve hole 20, thereby opening the valve hole 20 inside the secondary pressure chamber B. Pressure oil can be discharged.

Meanwhile, in parallel with this, the pressure increase piston 9 is slid to the right by the elastic force of the return spring 36 and returned to its original position shown in FIG.

At this time, the pressure oil in the feed-side piston chamber 40 is discharged through the communication passage 23 and the communication passage 15 while causing the valve body 25 to slide against the spring 30.

Incidentally, in the above embodiment, the inflow port 6
While the increased pressure is maintained by supplying pressure oil from
When the pressure oil in the secondary pressure chamber B leaks out and the secondary pressure drops for some reason, the pressure booster piston 9 slides toward the rod head and the primary pressure stops, dropping below the predetermined set pressure. When this happens, the valve seat 21 and the valve body 25 are returned to their original positions, pushing up the check valve body 32, which opens the valve hole 20 and causes the pressure oil in the primary pressure chamber A to flow out from the outflow port 8 via the secondary pressure chamber B. be done.

At the same time, the pressure increasing piston 9 is returned by the return spring 36.

In the above case, even if the primary pressure does not fall below the predetermined set pressure, after the pressure booster piston 9 has slid to the stroke end on the rond end side, the check valve body 32 is filled with pressure oil in the primary pressure chamber A. The valve seat 21, the pressure increase piston, etc. are returned to their original positions in the same manner as described above.

Thereafter, the pressure oil in the secondary pressure chamber B no longer flows out (then the primary pressure of the pressure oil in the primary pressure chamber A increases, and the above-described pressure increasing action is repeated.

Next, FIG. 3 shows a second embodiment of the present application, in which pressurized oil is supplied to the pressure increase valve 31e and the check valve body 32e by using the center pipe 5 at the head of the main body 1 as in the first embodiment. Instead of doing it from the end side, it is done from the side of the cylinder tube 2e, and the pressure increasing piston 9e is returned using pressure oil (or compressed air).

That is, 6e is an inflow port provided in the cylinder tube 2e, 41 is an annular space provided on the inner surface of the small diameter hole 'Ice of the cylinder tube 2e in correspondence with this inflow port 6e, 42
is the annular space 41 and the hollow chamber 15e within the rod portion 9be.
A communication hole is provided in the rod portion 9be to communicate with the inflow bow J□6e and the hollow chamber 15e through the annular space 41 and the communication hole 42 even when the pressure booster piston 9e slides. It is designed to be held in

43 is a supply/discharge port for returning the pressure increasing piston 9e.

Further, the cylindrical valve body 25e is slidably fitted into the small diameter hole 14e of the rod portion 9be, and a communication passage 29 is provided on the outer periphery.
A long groove 44 is provided so as to form a shape e.

As described above, the pressure increasing operation can be performed in substantially the same manner as in the first embodiment.

This embodiment has the advantage that it can be manufactured more easily because no central pipe is used, and that the pressure oil supply piping can be done from the side of the main body 1e.

It should be noted that portions that are considered to have the same or equivalent configuration as those of the first embodiment are given the same reference numerals with the letter e and redundant explanation will be omitted.

Similarly, in FIGS. 4 and 5 shown below, the same parts as those in the previous time are given alphanumeric characters f and g, and redundant explanation will be omitted.

FIG. 4 shows a third embodiment of the present application, in which a main piston storage hole 45 is provided in the main body 1f of the pressure intensifier, and a main piston 46 constituting a double-acting cylinder is provided in the main piston storage hole 45.
The main piston 46 is slidably fitted so that the main piston 46 is pressurized by the increased secondary pressure.

47 is a supply/discharge pipe for returning the main piston 46, and the rear end (fourth
The right end in the figure) is fixed to the inner center of the head end cap 3f, and the tip is inserted into a hollow hole 48 provided inside the main piston 46.

A fixed piston 49 is fixed to the tip of the supply/discharge pipe 47, and the hollow hole 48 of the main piston 46 is connected to the fixed piston 49.
It is designed to slide airtightly against the

Although the tip of the conduit 47a of the supply/discharge pipe 47 is closed, it communicates with the return chamber 50 on the right side of the hollow hole 46 defined by the main piston 46 through a communication hole 51.

52 is a supply and discharge port for supplying and discharging pressure oil (or compressed air) to and from the supply and discharge pipe 47; 53 is a supply and discharge passage for supplying and discharging pressure oil for returning the pressure booster piston 9f; It communicates with the return side piston chamber 37f of the pressure piston 9f.

Further, the valve seat 21f, the valve body 25f, and the check valve body 32f of the pressure increase valve 31f are each formed in an annular shape for the supply/discharge pipe 47, but are substantially the same as those in the first embodiment, and a description thereof will be omitted. .

As described above, when pressure oil is supplied from the inflow port 6f with the supply/discharge port 52 in the discharged state, this pressure oil flows into the secondary pressure chamber Bf through the valve hole 20f and causes the main piston 46 to move. Slide it to the left.

When the tip of the main piston 46 comes into contact with something and the sliding of the main piston 46 is stopped, the primary pressure of the supplied pressure oil increases, and the valve hole 20f opens in the same manner as in the first embodiment. It is closed, and the pressure oil in the secondary pressure chamber Bf is increased in pressure by the pressure increase piston 9f.

Therefore, the main screw I/N 46 receives a large thrust due to the effect of this increased secondary pressure.

Next, when the supply of pressure oil to the inflow port (6f) is switched to discharge, the primary pressure decreases and the pressure increase valve 31f is reset, thereby pushing up the check valve body 32f and opening the valve hole 20f. .

Thereafter, when pressure oil is supplied to the supply/discharge port 52, the pressure increase piston 9f and the main piston 46 are slid to the right and returned to their original positions shown in FIG.

In this embodiment, a double-acting (or single-acting) cylinder is built into the main body 1f of the pressure intensifier, so that the main body 1f of the pressure intensifier can be used directly as a fluid operating device.

For example, it can be used as a gripping arm for a robot or a workpiece holding arm for a machine tool.

In addition, the entire device is compact and convenient to handle.

Next, FIG. 5 shows a fourth embodiment of the present application, in which a pressure increase holding device 54 is built into the main body 1g of the pressure intensifier, and even if the supply of pressure oil to the inflow port 6g is stopped, the pressure increases. The piston 9g maintains the increased pressure state, and even if the pressure oil in the secondary pressure chamber Bg flows out in this state, this increased pressure state is maintained.The other parts are as described above. Since it is substantially the same as the embodiment, only the pressure increase/holding device 54 will be described below.

An auxiliary cap 55 is fixed to the right end of the cylinder tube 2g, and has a storage hole 56 inside, and a head end cap 3g is fixed to the right end.

Further, this auxiliary cap 55 is connected to the feed side piston chamber 40g in the cylinder tube 2g and the storage hole 56 at the partition wall 55a.
The inside is divided.

The right end of a central pipe 5g for supplying pressure oil to the pressure increase valve 31g and the check valve body 32g is fixed to the center of the partition wall 55a, and a fluid passage 7g is communicated with the storage hole 56.

57 is a valve seat body consisting of a base portion 57a and a shaft portion 57b;
The shaft portion 57b is housed and fixed in the housing hole 56 so as to be coaxial.

A check valve housing hole 58, a release piston housing hole 59, and a valve seat 60 that partitions these are formed in the shaft portion 57b of the valve seat body 57.
A guide portion 61 protruding from the inner surface of the head end camp 3g is coaxially inserted into the head end camp 9.

A flow path 62 that communicates with the inflow port 6g is opened at the end surface of the guide portion 61.

Reference numeral 63 designates a check valve that is slidably fitted into the check valve storage hole 58, and is biased to the right by a spring 64 with a weak elastic force, and the tapered portion 63a is in airtight pressure contact with the valve seat 60 to close the valve. Hole 6
5 is occluded.

A flow hole 66 is provided in the tapered portion 63a of the check valve 63.

Reference numeral 67 denotes a cap-shaped release piston that is slidably fitted in an airtight manner between the release piston housing hole 59 and the guide portion 61;
It is designed to be able to slide an appropriate amount in the left and right directions.

A push-up projection 68 is provided at the tip of the release piston 67, and when the release piston 67 slides to the left, the push-up projection 68 pushes up the check valve 63 against the spring 64, causing the valve hole 65 to It is now open to the public.

Further, a communication hole 69 is provided on the distal end side of the release piston 67.

Reference numeral 70 denotes an annular pressure-increasing holding piston that is slidably fitted in an airtight manner between the storage hole 56 of the auxiliary cap 55 and the shaft portion 57b of the valve seat body 5γ, and is fitted between the base portion 57a of the valve seat body 57 and the valve seat body 57. It is biased to the left by a compressed disc spring 71, and its position is regulated by abutting against the stepped portion 12.

73 is a communication hole provided in the base 57a of the valve seat body 57;
is the pressure oil (
The other end is connected to a supply/discharge port 52g for returning the main piston 46g.

With the above configuration, when pressure oil is supplied from the inflow port 6g, the pressure oil pushes up the check valve 63 against the spring 64, flows through the fluid passage 7g, and flows into the primary pressure chamber Ag.

Therefore, the pressure increasing piston 9g can perform the pressure increasing action in the same manner as in the above embodiment, but when the primary pressure increases and the pressure increasing piston 9g performs the pressure increasing action, this increased primary pressure It acts on the holding piston 70 to slide the pressure-increasing holding piston 70 to the right against the disc spring 71.

Thereafter, when the flow of pressure oil into the inflow port 6g is stopped, the check valve 63 comes into pressure contact with the valve seat 60 and closes the valve hole 65.
This state is maintained even if the inflow port 6g is opened, and the pressure increase piston 9g maintains its pressure increase effect.

Even if a small amount of pressure oil in the secondary pressure chamber Bg leaks out for some reason in this state, the amount of oil required for the sliding of the pressure booster piston 9g will cause the pressure booster holding piston 70 to move to the left. Since it is slid and replenished, the pressure increasing piston 9g maintains its pressure increasing effect even after that.

Next, when canceling this pressure increase effect, the supply/discharge port 52
This can be done by supplying pressure oil from g.

That is, when pressurized oil is supplied from the supply/discharge port 52g, this pressure oil flows into the right piston chamber 75 through the supply/discharge passage 74 and slides the release piston 67 to the left, thereby causing the push-up protrusion 68 to check. The valve 63 is pushed up to open the valve hole 65, and the pressure increasing action by the pressure increasing piston 9g is released.

As described above, in this embodiment, the pressure increase holding device 54 is built into the main body 1g of the pressure intensifier, so it is convenient to use when it is necessary to maintain the pressure increase state for a long time.

As described above, in the present invention, when the primary pressure on the inflow side exceeds a predetermined set pressure, the pressure increasing piston performs the pressure increasing action. It is possible to obtain a large amount of energy and reduce pump power, which has a great effect in terms of energy conservation.

Furthermore, even if a high secondary pressure can be obtained with a low primary pressure during operation as described above, the pressure increasing piston will automatically increase the pressure when the primary pressure exceeds a predetermined set pressure. Because of this, there is no need to attach a pressure detection device or switching device during assembly, and it can be directly connected in series to normal fluid piping or directly incorporated into fluid operating equipment such as actuators, making it easy to assemble. It requires less time and effort (and is economical).

In addition, when the primary pressure falls below a predetermined set pressure, the check valve automatically opens (so that the working fluid sent to the cylinder etc. can be returned directly through this check valve. This has the remarkable effect of eliminating the complexity of establishing a separate system.

Furthermore, as mentioned above, since there is no need to attach any other attachments for pressure increase, the whole can be made extremely compact during manufacture, expanding the range of use and making handling convenient. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first embodiment of the present invention, FIG. 2 is a sectional view showing the operating state of FIG. 1, FIG. 3 is a sectional view showing the second embodiment, and FIG. 4 is a sectional view showing the third embodiment. 5 is a cross-sectional view showing the fourth embodiment. FIG. Explanation of symbols of main parts, 1... Pressure intensifier main body, 2
a...Large diameter hole, 2c...Small diameter hole, 6.
... Inflow port 1-18 ... Outflow port, 9 ... Pressure increase piston, 9a ... Piston part, 9b ... Rod part, 15...
Hollow chamber, 16... Stopper first stage part, 19...
... Fixed valve seat, 20 ... Valve hole, 21 ...
...Movable valve seat, 22...Valve hole, 24...
・Spring, 25... Pressure increase valve body, 30...
Spring, 31... Pressure increase valve, 32... Check valve body, 35... Spring, 37... Return side piston chamber, 40...・Feed side piston chamber,
B... Pressurization chamber.

Claims (1)

[Scope of Claims] 1 A pressure intensifier piston having a large diameter hole and a small diameter hole are continuously provided in the main body of the pressure intensifier, and a pressure intensifier piston consisting of a large diameter piston portion and a small diameter rod portion is provided in the large diameter hole and the small diameter hole. The piston part and the rod part are slidably fitted to form a return side piston chamber on the rod end side and a feed side piston chamber on the head end side from the piston part in the large diameter hole, respectively. A pressure intensification chamber is formed on the rod end side of the rod portion in the hole, a communication hole is formed in the pressure intensification piston to communicate the feed side piston chamber and the pressure intensification chamber, and a hollow chamber is formed in the middle of this communication hole. The communication hole between the hollow chamber and the feed-side piston chamber is provided with a rod end side that is slidably fitted into the communication hole and abuts against the first step of the stopper of the pressure booster piston using a relatively strong spring. A movable valve seat with a valve hole in the center and a movable valve seat that is movably fitted into a communication hole on the rod end side from the movable valve seat and is attached to the first stage of the stopper of the pressure booster piston by a relatively weak spring. A pressure increasing valve consisting of a pressure increasing valve body which can be biased toward the movable valve seat side so as to come into contact with the movable valve seat to close the valve hole thereof is provided, and the communication hole between the hollow chamber and the pressure increasing chamber is provided with:
A fixed valve seat is provided integrally with the pressure booster piston and has a valve hole in the center, and the fixed valve seat is movably fitted into the communication hole on the rod end side of the fixed valve seat and is connected to the fixed valve seat side by a relatively weak spring. A check valve consisting of a check valve body that can be biased to close the valve hole is provided, and the hollow chamber is communicated with the inflow boat and the pressure increase chamber is communicated with the outflow port, and the fluid pressure inside the hollow chamber is communicated with the inflow port. When the pressure is below a predetermined pressure, the movable valve seat is brought into contact with the first step of the stopper by the spring, and after this movable valve seat pushes up the pressure booster valve and closes the pressure booster valve, the pressure booster valve becomes a check valve. Push up to open the check valve,
When the fluid pressure exceeds a predetermined pressure, the movable valve seat is moved toward the head end, and the pressure booster valve releases the push-up of the check valve, and after the check valve is closed, the pressure booster returns to the first stage of the stopper. This is a self-acting pressure booster consisting of the pressure booster valve and check valve that open the pressure booster when they come into contact with each other. The piston part and the rod part of a pressure booster piston, which is composed of a large diameter piston part and a small diameter rod part, are slidably fitted into the small diameter hole and returned to the rod end side from the piston part in the large diameter hole. A side piston chamber is formed on the head end side, and a feed side piston chamber is formed on the head end side, and a pressure increasing chamber is formed on the rod end side from the rod portion in the small diameter hole. A communication hole is formed to communicate the pressure chambers, a hollow chamber is formed in the middle of the communication hole, and the communication hole between the hollow chamber and the feed side piston chamber is slidably fitted into the communication hole. At the same time, a movable valve seat is biased toward the rod end by a relatively strong spring so as to come into contact with the first step of the stopper of the pressure booster piston, and has a valve hole in the center, and a communication hole from the movable valve seat to the rod end side. The pressure increase valve body is movably fitted into the interior of the pressure increase valve body, and is biased by a relatively weak spring toward the movable valve seat side so as to come into contact with the first step of the stopper of the pressure increase piston, thereby closing the valve hole of the pressure increase piston. A pressure valve is provided in the communication hole between the hollow chamber and the pressure intensifying chamber.
A fixed valve seat is provided integrally with the pressure booster piston and has a valve hole in the center, and the fixed valve seat is movably fitted into the communication hole on the rod end side of the fixed valve seat and is connected to the fixed valve seat side by a relatively weak spring. A check valve consisting of a check valve element that can be biased to close the valve hole is provided, the hollow chamber is communicated with the inflow port, the pressure increase chamber is communicated with the outflow port, and the fluid pressure within the hollow chamber is communicated with the inflow port. When the pressure is below a predetermined pressure, the movable valve seat is brought into contact with the first step of the stopper by the spring, and after this movable valve seat pushes up the pressure booster valve and closes the pressure booster valve, the pressure booster valve closes the check valve body. Push up to open the check valve, and when the fluid pressure exceeds a predetermined pressure, the movable valve seat is moved toward the head end, and the pressure booster releases the push-up of the check valve and the check valve is closed. The pressure increase valve body contacts the first step of the stopper to open the pressure increase valve (the pressure increase valve and the check valve are configured as shown in FIG. A self-acting pressure booster in which a piston is fitted so as to be slidable back and forth, and the outflow port is communicated with a main feed side piston chamber on the head end side of the main piston.