JP2588016B2 - Fluid pressure device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure device, and more particularly to a fluid pump device or a fluid pressure conversion device having a high pressure output exceeding 1,000 atm.

[Prior Art] The present applicant has previously filed a patent application for an invention called "high-pressure pump device" (filing date: February 28, 1989)
However, the present invention is deeply related to the invention of the subsequent patent application. In this invention of the applicant's earlier patent application (prior art), the pump causes a plurality of sets of pistons to act on the membrane member, and the membrane member pressurizes the water, thereby making the water very It can discharge at high pressure. Pistons of different diameters are utilized, with medium pressure driving relatively large diameter pistons, while relatively small diameter pistons can discharge fluid at very high pressures. A rotation control valve is provided at a front portion of the piston (upstream portion in the direction of fluid flow, the same applies hereinafter), and the transmission between the pump or the main pump and the rotation control valve relatively loosens the main piston. The high-pressure side suction valve and discharge valve can be made to move at a high speed, which has the effect of extending the useful life of the suction valve and the discharge valve.

However, the above-mentioned conventional technology has a problem in that a configuration including a main drive motor, for example, an electric motor is required for transmission.

[Object of the invention]

It is an object of the present invention to provide a device (unit) which can be installed indoors or outdoors, and which can be installed in a vehicle if a medium pressure fluid can be supplied. Is to eliminate the problem.

[Summary of Configuration of the Invention]

The present invention achieves the object of the present invention by providing a configuration in which a fluid motor is provided in a return flow from a cylinder to drive a control valve according to the present invention.

〔Example〕

As shown in FIGS. 1 and 2, medium pressure pistons 8, 9 are provided reciprocally in cylinders 14, 15, and they are reciprocable in high pressure cylinders 11, 12. The high pressure pistons 5 and 6 driven by the medium pressure pistons 8 and 9 are connected via members indicated by reference numerals 308, 309, 310, and 312, for example.

An inlet hole 238 and an outlet hole 239 are formed on the high pressure side, and an adjacent first high pressure chamber into which fluids having different pressures enter.
A membrane member 58 can be provided between 35 and the second high-pressure chamber 37. One of the above fluids having different pressures is usually oil,
The other is a non-lubricating fluid, for example water.

The high pressure side or high pressure part is provided in the housing 81, 82, 83, 84, 85, 86, while the medium pressure side or medium pressure part is provided in the housing 80. The control section housing 18 is mounted on the housing 80 of the intermediate pressure section, and the housing 18 has a flow control valve 17 which is a rotary valve in the illustrated embodiment.

The illustrated device can be connected to a medium pressure fluid source, such as by a tube or hose. Medium pressure fluid
The fluid enters the flow control valve 17 through the fluid passage 26 at the inlet. In operation, the control valve 17 causes the medium pressure fluid to flow in sequence from the fluid passage 92 into the cylinder 14, then into the cylinder 15, and then into the cylinder 14, thereby causing the piston 9
Performs a downward stroke, the piston 8 is driven to the upward stroke or vice versa. While the control hole 93 is the inlet hole of the flow control valve, i.e., the rotary valve 17, the control hole 94
Return flow holes or outlet holes. Accordingly, the medium pressure fluid flows from the control holes 93 as the inlet holes to the cylinders 14 and 15.
When flowing to one side, the return fluid of a relatively low pressure of the cylinder 14 or 15 flows out of the control hole 94 which is the outlet hole,
At this time, the pistons 8 or 9 of those cylinders perform a downward stroke (the downward stroke of the piston is a return stroke, and the upward stroke is a fluid pressurization stroke).

According to the present invention, the relatively low-pressure return fluid (hereinafter, referred to as a low-pressure fluid) is supplied from the fluid passages 302 and 301 through the fluid passages 302 and 301.
The suction port 313 of the fluid motor 97, which is connected to the flow control valve 17 which is a rotary valve directly or via a gear device.
to go into. This low pressure fluid, or return fluid, is
Flow through 97 rotates the shaft of this motor, which causes the flow control valve 17 to rotate. The return fluid then flows out of the fluid motor 97 through the outlet hole 304 and is normally returned to the fluid tank.

A feature of the above configuration of the present invention is that no driving means other than the fluid motor 97 is required to rotate the flow control valve 17. That is, the control valve 17 by the fluid motor 97 of the device (unit) according to the present invention is rotated.

The important point, however, is that the fluid motor 97 is provided in the return fluid flow. This is the motor 97
Is provided in the suction flow at the front portion of the fluid passage 26 at the suction port, a medium-pressure fluid acts on the motor 97, which may cause a leak in the motor 97, and This is because it has a disadvantage that it must be manufactured with high strength for high pressure. Further, in this case, the amount of fluid flowing into the control unit housing 18 is limited to the pressure capacity of the existing motor. Thus, in accordance with the present invention, fluid motor 97 includes cylinder 14 and
It is necessary to incorporate it into the flow path of the return fluid from 15.

In order to prolong the service life of the valves in the inlet and outlet holes 238 and 239 of the high-pressure section, the number of piston strokes per unit time is reduced, and the number of opening and closing of the valve is equal to the number of piston strokes. It is necessary to. Therefore, the fluid motor 97 is preferably a low-pressure motor, in which case the motor is inexpensive. However, the flow rate through the volume of the fluid motor 97 per unit revolution (usually indicated in cc / revolution, where cc is cubic centimeters) is the same as the inlet fluid passage 26 per unit time.
5 to 20 times the inflow of medium pressure fluid through For example, when the flow rate into the fluid passage 26 is 40 liters per minute and the rotation speed of the rotary valve is 200 rpm, the consumption volume of the fluid motor 97 is approximately 40000 cc / 200 rpm = 200 cc / rotation. , Which means 200 cubic centimeters per revolution.

The flow control valve or rotary valve 17 can be used as a fluid supply pump 96 at the other end (the left end in FIG. 1). As a result, it is possible to obtain a return pressing force for lowering the piston into the middle pressure chambers 44, 45, 46. The hole 94 communicates with the cylinder when the piston descends. A fluid path 305 is provided to pump fluid from the fluid supply pump 96 into the middle pressure chambers 44,45,46.

FIG. 2 shows a device similar to the device shown in FIG. 1, but FIG. 2 shows a number of modified configurations as another embodiment of the present invention. For example, a pressure valve 4 with a biasing member 425
24 is provided in the fluid 305 and is used as limiting means for preventing a sudden change in the rotation of the rotary valve or its overspeed rotation. The pressure valve 424 activates the fluid supply pump 96 above its set pressure to allow the flow control valve 17 to operate.
To prevent overspeed rotation of the motor. Further, the pressure in the middle pressure chambers 44, 45, 46 can be controlled by providing overflow valves 414 for those chambers.

Another important and novel measure is that an overflow valve 409 biased by, for example, a spring 410 is provided in the fluid passage 26 or 408 in front of the flow control valve 17. The overflow valve 409 must be provided with a fluid passage 412 to the inlet hole 313 of the fluid motor 97. This configuration allows all of the medium pressure fluid to overflow.
When flowing beyond 9, it is important to allow the overflow from the medium pressure pump 19 to flow to the fluid motor 97 and to rotate this motor. Without this important configuration, the apparatus of the present invention would shut down whenever feed fluid flows past overflow valve 409. If this overflow or safety valve 49 is provided in the medium pressure pump 19 remote from the device of the present invention, a fluid passage from the overflow valve 409 to the fluid motor 97 must be provided.

FIG. 3 shows a pressure ratio valve, which is very useful in the device of the present invention. For example, medium pressure chambers 44, 45,
The pressure in 46 must always be higher than the pressure in the inlet 313 to the fluid motor 97, but this would otherwise cause the pistons 8,9,5,6 to go down for the return stroke. This is because it becomes impossible to obtain it, and the device will stop. Or, if the suction stroke is
If the pressure in the chamber 35 is higher than the pressure in the inlet hole 417, the chamber 37 cannot suction fluid. Then, the membrane member 58 does not perform a bending motion, and therefore, the pump device does not discharge the high-pressure fluid.

Therefore, the hole 431 of the pressure ratio valve shown in FIG. 3 is connected to the adjacent high pressure side chamber or fluid passage, and the hole 428 on the other side is connected.
Must be connected to their lower pressure side chambers or fluid passages. The hole 435, also shown in FIG. 3, connects to the unpressurized fluid tank or lower pressure pressurized chamber of the device. According to this configuration, the low pressure, when it is pressurized to a degree of danger, may cause the piston valve element 432 shown in FIG.
And 433 are moved to the left position as shown in FIG. 3 to allow low pressure fluid to flow through fluid passages 434, 436, 435, thereby preventing the creation of excessively high pressure in the low pressure fluid. For this purpose, in the configuration example shown in FIG. 3, the piston is a differential piston provided in a cylinder having a large and small diameter portion. The relatively small diameter portion is the piston portion 432 and the cylinder portion 430, and the relatively large diameter portion is the piston portion 433 and the cylinder portion 427.

Pumps 402, 403, 404 having discharge ports 405, 406, 407
Can be provided to perform still another operation in the device of the present invention, if necessary.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the fluid pressure device of the present invention. FIG. 2 is a longitudinal sectional view showing an apparatus similar to the apparatus shown in FIG. 1, showing an embodiment in which the configuration is partially changed. FIG.
FIG. 3 is a longitudinal sectional view showing a pressure ratio valve that is advantageously used in the device of the present invention. 5,6,8,9 …… Piston, 11,12,14,15 …… Cylinder, 17…
... Rotary flow control valve or rotary valve, 18 ... Control unit housing, 26,301,302,412,434,435 ... Fluid passage (435 ... Outlet fluid passage), 97 ... Fluid motor, 312 ... Suction port, 409 ... Safety valve or overflow Valve, 427,430 ... differential cylinder, 428,431 ... hole (of working cylinder), 432,433 ... working piston (433 ... large diameter piston part).

Claims (3)

(57) [Claims] At least one reciprocating motion is possible in a cylinder.
A device comprising a pair of pistons and a rotary flow control valve disposed in a front portion of a cylinder and between an inlet hole and a fluid passage to the cylinder, and provided in a control unit housing, wherein the fluid is supplied from the cylinder. A fluid passage for returning fluid to the motor is provided, and the fluid is sent to the fluid motor to rotate the shaft, and the fluid motor shaft is at least indirectly clutched to the rotary flow control valve, A fluid pressure device, wherein a rotary flow control valve is rotated by return fluid flowing out of a cylinder. 2. A safety valve is provided at the inlet hole, and a fluid passage to a suction port of the fluid motor is provided at a rear portion of the valve to send overflow of the safety valve to the fluid motor. The fluid pressure device according to claim 1. (3) receiving pressure by different pressures of high and low;
Device having a plurality of adjacent actuating members, wherein a differential piston is reciprocally movable within the differential cylinder, and a hole at an end of the differential cylinder communicates with the different pressures of the height, and a differential piston of the differential cylinder is provided. An outlet fluid passage is provided between the cylinder portions, a fluid passage is provided through the large-diameter piston portion of the differential piston, and one of the different pressures of the height is always kept lower than the other. Features a fluid pressure device.