JPH0433423Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention uses an incompressible fluid such as water or oil, or a compressible fluid such as steam or air as a working fluid,
Regarding a pressure intensifier for increasing the pressure of an incompressible fluid or a compressible fluid to several times to hundreds of times the pressure of the working fluid, in particular, an automatic direction device that automatically switches the direction of a piston using fluid pressure. The present invention relates to a pressure intensifier that increases the pressure of fluid using a switching mechanism.

[Prior Art] Conventionally, a check valve or a pilot switching valve is incorporated into the main body of a single-acting pressure booster, and the pilot switching valve is automatically switched to the opposite side at the end of the stroke of the main piston, thereby causing the main piston to continuously reciprocate. There are known devices that continuously pump out high-pressure oil by pumping, but the ones currently on the market increase the pressure by about 3 to 5 times, and the oil that is discharged is intermittent. Pulsation also tends to increase.

Furthermore, there is known a system in which two or more oil motors are directly connected to increase pressure. In such a pressure increaser, the oil motor on one side is driven with low pressure oil pressure and the rotational force is transmitted to the other oil motor, so the flow rate decreases but the oil pressure increases.

Regarding these technologies, for example, "Hydraulics you want to know/applications" by the Fujikoshi Hydraulic Research Group published in 1983 (Japan Machinist Co., Ltd.,
Tokyo) pages 172 to 179.

[Problem to be solved by the invention] However, the above-mentioned conventional pressure booster has a complicated mechanism, and its working fluid is mainly oil, and its pressure is in the range of several tens of kgf/cm 2 to several tens of kgf/cm ² .
It is high at 100Kgf/cm ² and the flow rate of working fluid is low.
The pressure increase ratio is also small.

Furthermore, in the conventional pressure booster described above, it is almost difficult to change the working fluid from an incompressible fluid such as oil to a compressible fluid such as air, and it is difficult to handle a large flow rate of working fluid. It was inappropriate and impossible.

Therefore, in view of the above-mentioned prior art, it is an object of the present invention to provide a pressure booster with a simple mechanism that can use both compressible and incompressible fluids as working fluids. be.

[Means for Solving the Problem] According to the present invention, the above object is achieved by providing a main piston cylinder and an auxiliary piston cylinder, each of which is slidably fitted inside the main piston cylinder and the auxiliary piston cylinder. It consists of a main piston and an auxiliary piston, a fluid path switching valve that reciprocates its position as the main piston reciprocates, and a pilot switching valve that reciprocates its position as the auxiliary piston reciprocates, The fluid passage switching valve and the pilot switching valve cooperate with fluid ports formed in the piston cylinder and the auxiliary piston cylinder, and automatically switch the fluid passage alternately as the main piston and the auxiliary piston reciprocate. The pressure booster is equipped with an automatic direction switching mechanism for switching the direction of the pressurized fluid, and further includes a pressure booster piston and a pressure booster cylinder that increase the pressure of the fluid as the main piston reciprocates. will be achieved.

[Function] That is, according to the above-mentioned pressure intensifier, the above-mentioned pressure increaser utilizes an automatic direction switching mechanism that alternately switches the fluid passages and automatically switches the direction of the pressurized fluid as the main piston and the auxiliary piston reciprocate. By configuring the fluid to be pressurized by the reciprocating motion of the main piston, both compressible and incompressible fluids can be used as working fluids.
The mechanism will also be simple.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, FIG. 1 shows a pressure booster using an automatic direction switching mechanism, which is an embodiment of the present invention.
This pressure booster is particularly suitable when the working fluid has a small flow rate. In this figure, the automatic direction switching mechanism is composed of a main piston cylinder 1 and an auxiliary piston cylinder 2. The main piston cylinder 1 includes a main piston 3 whose outer circumferential surface contacts the inner circumferential surface of the main piston cylinder 1 and is capable of sliding left and right, a switching valve groove 4 formed on the outer circumference of the main piston 3, 4, and a plurality of pressure ports E, I, H, J, G, I, F are provided on the wall surface (lower side of the figure) of the main piston cylinder 1.

On the other hand, inside the auxiliary piston cylinder 2,
An auxiliary piston 5 has disk-shaped piston parts 52, 52 attached to both ends of an elongated shaft 51, and a spool 6 is provided on the outer periphery of the shaft 51 of this auxiliary piston 5 and functions as a pilot switching valve. The wall surface of this auxiliary piston cylinder 2 also has a plurality of pressure ports A, B, C, D,
R, R, P are formed. Of these pressure ports, port A is connected to port E, port B to port F, port C to port G, and port D to port H, respectively. Further, among these ports, port P is a working fluid introduction port formed on the wall surface of the auxiliary piston cylinder 2, and ports R are so-called return ports.

According to the present invention, pressure intensifier pistons 61, 61 are further attached to the automatic direction switching mechanism, that is, intensifier pistons 61, 61 protruding from the left and right sides of the main piston 3, and at the left and right ends of the main piston cylinder 1. The pressure intensifier cylinders 62, 62 are attached to form a piston type pressure intensifier. In the vicinity of the closed ends of these pressure booster cylinders 62, 62, there is a fluid inlet 6 to be boosted, respectively.
3, 63 and pressurized fluid outlets 64, 64 are provided.

Next, to explain the operation of the pressure booster described above, in the attached FIG. The working fluid is introduced into the auxiliary piston cylinder 2. The introduced working fluid flows through the first spool valve section 601 on the right side of the spool 6 and the first spool valve section 601 formed on the right inner surface of the auxiliary piston cylinder 2.
It is guided to the port B through the gap between the sleeve 9 and the sleeve 9. The working fluid led to port B passes through port F to the main piston cylinder 1.
The main piston 3 is guided to the right side of the chamber, and its pressure pushes the main piston 3 to the left side. This main piston 3
As it moves to the left, the switching valve grooves 4, 4 formed on its outer periphery also move, and as shown in the figure, the port J communicates with the port G via the switching valve groove 4 on the right side. As a result, the working fluid inside the auxiliary piston cylinder 2 passes through these ports J and G, and is further introduced into the interior from the port C provided at the left end of the auxiliary piston cylinder 2.

At the same time, the fluid in the left chamber of the main piston cylinder 1 passes from port E to port A, passes through the gap between the second spool valve part 602 of the spool 6 and the second sleeve 10, and passes through the left return port R. be led to. Further, the port D provided at the right end of the auxiliary piston cylinder 2 communicates with the other return port I from the port H via the switching valve groove 4 (left side), and connects the auxiliary piston cylinder 2 and the auxiliary piston portion 52 ( Release the chamber formed by the right side). On the other hand, as described above, the working fluid from port G is introduced into the left end chamber formed by the auxiliary piston cylinder 2 and the auxiliary piston part 52 (left side) through port C. , moves the auxiliary piston 5 to the right.

Next, FIG. 3 attached hereto shows how the auxiliary piston 5 moves to the right. In this state, the working fluid introduced into the auxiliary piston cylinder 2 from the introduction port P is transferred to the first spool valve portion 601 on the left side of the spool 6 and the first spool valve portion 601 formed on the left inner surface of the auxiliary piston cylinder 2. It is guided to the port A through the gap between the sleeve 9 and the sleeve 9. The working fluid led to this port A passes through port E to the main piston cylinder 1.
The main piston 3 is guided to the left chamber of the main piston 3, and its pressure pushes the main piston 3 to the right side. This main piston 3
As it moves to the right, the switching valve grooves 4, 4 formed on its outer periphery also move, and as shown in the figure, the port J communicates with the port H via the switching valve groove 4 on the left side. As a result, the working fluid inside the auxiliary piston cylinder 2 passes through these ports J and H, and is further introduced into the interior from the port D provided at the right end of the auxiliary piston cylinder 2. At the same time, the fluid in the right chamber of the main piston cylinder 1 passes from port F to port B, passes through the gap between the second spool valve part 602 of the spool 6 and the second sleeve 10, and passes through the right return port R. be led to. In addition, the piston cylinder 2
The port C provided at the left end of the port G is connected to the other return port I (right side) via the switching valve groove 4 (right side).
The chamber formed by the auxiliary piston cylinder 2 and the auxiliary piston portion 52 (left side) is opened. On the other hand, as mentioned above, since the working fluid is introduced into the right-end chamber of the auxiliary piston cylinder 2 from the port D, the auxiliary piston 5 is moved to the left and the state shown in FIG. Return to By repeating the above operations, the direction of the pressurized fluid is automatically switched.

Due to the action of the main piston 3 that moves left and right in conjunction with the automatic direction switching operation of the pressurized fluid, the pressure intensifier pistons 61, 61, which are provided so as to protrude from the left and right sides of the main piston 3, move into the pressure intensifier cylinder 6.
2, 62 to the left and right, fluid is introduced from the pressurized fluid inlets 63, 63, compressed and pressurized, and discharged from the increased fluid outlets 64, 64.

Next, FIG. 4 attached hereto shows a pressure booster using an automatic direction switching mechanism, which is another embodiment of the present invention. It is suitable for cases where In the figure, the automatic direction switching mechanism is arranged around a cylindrical main piston cylinder 1, similar to the embodiment shown in FIG.
and an annular auxiliary piston cylinder 2 provided concentrically to surround the cylindrical main piston cylinder 1. A main piston 3 is provided inside the main piston cylinder 1 and is capable of sliding left and right while its outer peripheral surface is in contact with the inner peripheral surface of the main piston cylinder 1. In this case, switching valve grooves 4, 4 are formed. The outer peripheral wall surface 11 of the main piston cylinder 1 has a plurality of pressure ports E, I,
The provision of H, J, G, I, and F is also similar to the embodiment shown in FIG. 1 above. The appearance of this main piston 3 is as shown in FIG.

On the other hand, inside the annular auxiliary piston cylinder 2, there is an auxiliary piston 5 in which an annular piston part 52 is attached to both ends of a tubular shaft 51, and this auxiliary piston 5 is arranged on the inner peripheral side of the shaft 51,
A spool 6, also tubular, is provided which serves as a pilot switching valve. On the inner peripheral side wall surface 21 of this annular auxiliary piston cylinder 2,
Pressure ports A, B, J, R, and R are formed, and an introduction port P is formed in the center of the wall surface 22 on the outer peripheral side thereof. Further, pressure ports C,
D is formed. Of these pressure ports, port A is connected to port E, port B is connected to port F, port C is connected to port G, port D is connected to port H, and return ports R, R are connected to
They are opened to the left and right sides, respectively, and also communicate with ports I and I formed on the wall surface of the main piston cylinder 1. Also, the reference numeral 71 in the figure
and 72 indicate a spool penetration portion and an auxiliary piston penetration portion formed in the tubular shaft 51 of the spool 6 and the auxiliary piston 5, respectively. Further, the reference numeral 70 in the figure is a main piston liner.

According to the present invention, pressure intensifier pistons 61, 61 are protrudingly attached to the left and right sides of the main piston 3 of the automatic direction switching mechanism, and intensifier pistons 61, 61 are attached to the left and right ends of the main piston cylinder 1. Pressure cylinders 62, 62 are attached to form a piston-type pressure intensifier. Similar to the above embodiment, pressurized fluid inlets 63, 63 and pressurized fluid outlets 64, 64 are provided near the closed ends of these pressure booster cylinders 62, 62, respectively. be.

Further, attached FIG. 6 shows an enlarged sectional view of the ports A and B, and FIG. 7 shows an enlarged sectional view showing the assembled structure of the annular piston portion 52 at the end of the auxiliary piston 5. There is. In particular, the assembly structure of the annular piston portion 52 shown in FIG. 7 is designed to facilitate assembly of the auxiliary piston 5. Furthermore, FIGS. 8a and 8b show an inner peripheral side wall surface 21 forming the annular supplementary piston cylinder 2.
The structure of the end of is shown. As is clear from these figures, the annular auxiliary piston cylinder 2
First and second spool valve portions 6 formed on the inner circumference of the tubular spool 6 are provided on the inner circumferential side wall surface 21 of the tubular spool 6.
01, 602 are formed, and a plurality of sleeve guides 65, 66 are formed extending in the axial direction from these first and second sleeves 9, 10. has been done. Further, the attached FIG. 9 shows the structure of the above-mentioned fluid passage (for example, the fluid passage 80),
As is clear from this figure, a plurality of partition plates 82, 82, . . . are inserted into the outer frame 81 forming the passage, thereby providing mechanical strength. Furthermore, in the attached FIG. 10, N- in FIG.
The N cross-section is shown, and the fluid passage 80 described above is provided in the radial direction, and other fluid passages 83 and 84 are provided in the axial direction.

Next, to explain the operation of the pressure booster described above, first, the automatic direction switching mechanism is similar to the embodiment shown in FIG.
Considering the state where has moved to the left side, the introduction port P
The working fluid introduced from the piston cylinder 2 is introduced into the auxiliary piston cylinder 2. This introduced working fluid flows through the first spool valve section 6 on the right side of the spool 6.
01 and the first sleeve 9 formed on the right inner surface of the auxiliary piston cylinder 2, and is guided to the port B through the gap. The working fluid led to port B is led to the right chamber of the main piston cylinder 1 through port F, and its pressure forces the main piston 3 to the left. This main piston 3
As it moves to the left, the switching valve grooves 4, 4 formed on its outer periphery also move to the left, and the port J communicates with the port G via the switching valve groove 4 on the right side.
The working fluid inside the auxiliary piston cylinder 2 passes through these ports J and G, and is further introduced into the auxiliary piston cylinder 2 from the port C provided at the left end of the auxiliary piston cylinder 2. It happens.

At the same time, the fluid in the left chamber of the main piston cylinder 1 passes from port E to port A, passes through the gap between the second spool valve part 602 of the spool 6 and the second sleeve 10, and passes through the left return port. R
be led to. In addition, the auxiliary piston cylinder 2
A port D provided at the right end of the port communicates with the other return port I from the port H via the switching valve groove 4 (left side), and connects the auxiliary piston cylinder 2 and the piston portion 52 (right side) of the auxiliary piston 5. Release the chamber that forms. On the other hand, as mentioned above, since the working fluid from port G is introduced into the left end chamber of the auxiliary piston cylinder 2 through port C,
Move the auxiliary piston 5 to the right.

Next, when the auxiliary piston 5 moves to the right, the working fluid introduced into the auxiliary piston cylinder 2 from the introduction port P flows through the first spool valve section 601 on the left side of the spool 6 and the auxiliary piston. It is guided to port A through a gap between the cylinder 2 and the first sleeve 9 formed on the left inner surface.
The working fluid led to port A is led to the left chamber of the main piston cylinder 1 through port E, and its pressure pushes and moves the main piston 3 to the right. As the main piston 3 moves to the right, the switching valve grooves 4 formed on its outer periphery also move, and the port J communicates with the port H via the left switching valve groove 4. The working fluid inside the auxiliary piston cylinder 2 passes through these ports J and H, and is further introduced into the auxiliary piston cylinder 2 from the port D provided at the right end of the auxiliary piston cylinder 2. Become. At the same time, the fluid in the right chamber of the main piston cylinder 1 passes from port F to port B, passes through the gap between the second spool valve part 602 of the spool 6 and the second sleeve 10, and passes through the right return port R. be led to. Further, a port C provided at the left end of the auxiliary piston cylinder 2 communicates from port G with another return port I (right side) via a switching valve groove 4 (right side), and connects the auxiliary piston cylinder 2 and the auxiliary piston. The left chamber formed by the piston portion 52 of No. 5 is opened. On the other hand, as described above, since the working fluid is introduced into the right end chamber of the auxiliary piston cylinder 2 from the port D, the auxiliary piston 5 returns to the state in which it has been moved to the left. By repeating the above operations, the direction of the pressurized fluid is automatically switched, and due to the action of the main piston 3, which moves from side to side in conjunction with this automatic direction switching operation of the pressurized fluid,
Pressure intensifier pistons 61, 61 protruding from the left and right sides of the main piston 3 are connected to pressure intensifier cylinders 62,
62 to the left and right, and the pressurized fluid inlet 6
The fluid is introduced from 3 and 63, compressed to increase its pressure, and discharged from pressurized fluid outlets 64 and 64, as in the above embodiment.

In this other embodiment, an auxiliary piston cylinder 2 is provided concentrically outside the main piston cylinder 1, and a fluid passage is formed between them, thereby shortening these fluid passages and opening the ports. It is possible to have a large cross-sectional area,
Therefore, the pressure loss of the working fluid can be reduced. Further, according to the other embodiments described above, it is possible to increase the area of the piston, so that
It is possible to increase the pressure increase ratio, and by using the pressure booster according to this embodiment, it becomes possible to easily obtain high pressure fluid using low pressure working fluid.

Furthermore, regarding the application range of the pressure booster mentioned above, first, the pressure of the fluid is increased using low-pressure steam or low-pressure steam obtained from a heat source such as hot water as the working fluid, and the energy is easily recovered. Next, we will use low-pressure air pressure obtained by wave force as a working fluid to increase the pressure of the fluid and make it easier to recover energy. An application method that uses water as a working fluid to increase the pressure of the fluid and makes it easy to recover energy, and when increasing the pressure of water as a fluid, there are various methods such as being able to send water from lowlands to highlands. Possible range of applications.

[Effects of the invention] As is clear from the above explanation, according to the invention, as the main piston and the auxiliary piston move back and forth with the pressurized fluid, the fluid passages are automatically switched alternately and the direction of the pressurized fluid is changed. To provide a pressure intensifier that can use even relatively low-pressure compressible fluids and incompressible fluids as working fluids by using an automatic direction switching mechanism that switches between them, and whose mechanism is simple. It exhibits extremely excellent effects.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the structure of a pressure booster using an automatic direction switching mechanism according to an embodiment of the present invention, Figures 2 and 3 are diagrams showing the operation of the pressure booster, and Figure 4 is a cross-sectional view of the present invention. A fifth cross-sectional view showing the structure of a pressure booster using an automatic direction switching mechanism, which is another embodiment of the invention.
The figure is a plan view showing the main piston of the pressure booster.
The figure is a partially enlarged sectional view showing a part of the fluid passage of the pressure booster, FIG. 7 is a partially enlarged sectional view showing the assembly structure of the end of the annular piston part of the pressure booster, and FIGS. 8a and b 9 is a partially enlarged sectional view and a plan view showing the internal structure of the annular auxiliary piston cylinder of the pressure booster, FIG. 9 is a perspective view showing the structure of the fluid passage of the pressure booster, and FIG. 10 is the same as FIG. 4 above. FIG. 1...Main piston cylinder, 2...Auxiliary piston cylinder, 3...Main piston, 4...Switching valve groove,
A, B, C, D, E, F, G, H, I, J, P,
R... Port, 5... Auxiliary piston, 51... Shaft, 52... Piston part, 6... Spool, 6
1... Pressure booster piston, 62... Pressure booster cylinder, 63... Pressurized fluid inlet, 64... Pressurized fluid outlet.

Claims (1)

[Claims for Utility Model Registration] (1) A main piston and an auxiliary piston that are slidably fitted inside the main piston cylinder and an auxiliary piston cylinder, and whose positions reciprocate as the main piston reciprocates. It consists of a fluid passage switching valve that moves and a pilot switching valve that reciprocates its position as the auxiliary piston reciprocates, and the fluid passage switching valve and the pilot switching valve are connected to the main piston cylinder and the auxiliary piston cylinder. an automatic direction switching mechanism that cooperates with a fluid port formed in the main piston and automatically switches the direction of the pressurized fluid by alternately switching the fluid passage as the main piston and the auxiliary piston reciprocate; A pressure intensifier characterized by comprising a pressure intensifier piston and a pressure intensifier cylinder that increase the pressure of a fluid as the piston reciprocates. (2) In the pressure booster described in claim 1 of the utility model registration claim, the automatic direction switching mechanism constituting the pressure booster has the main piston cylinder and the auxiliary piston cylinder arranged concentrically; . A pressure intensifier, characterized in that the main piston and the auxiliary piston are configured to reciprocate and slide in the direction of the concentric rotation axis. (3) In the pressure booster described in claim 1 of the utility model registration claim, the pressure booster piston is attached to both ends of the main piston, and the pressure booster cylinder is further attached to both ends of the main piston cylinder. A pressure booster featuring: