JPH0417815Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a compact and lightweight pressure booster for generating ultra-high pressure.

[Conventional technology]

Pressure intensifiers for generating ultra-high pressure are used for various purposes, such as the tunnel excavation method using ultra-high pressure jets (Japanese Patent Application Laid-open No. 1989-1999), which the present applicant previously proposed.
85096) to obtain ultra-high pressure jets.

By the way, conventional ultra-high pressure devices of this type are large and heavy compared to their output, and it has been difficult to reduce their weight due to their structure. For this reason, it has been impossible to compactly incorporate it into high-pressure water injection equipment used in tunnel excavation methods using ultra-high-pressure jets.

[Problem that the invention attempts to solve]

The present invention aims to reduce the size and weight of the ultra-high pressure intensifier by providing an intermediate pressure intensifier between the ultra-high pressure intensifier and the hydraulic pump that is the source of oil pressure generation, and also provides a pressure intensifier that can be controlled appropriately. The purpose is to

[Means for solving problems]

According to the pressure booster of the present invention, an intermediate pressure booster is interposed between the hydraulic pressure generation source and the ultra-high pressure booster, and the movement of the rod of the intermediate pressure booster is detected in order to detect the movement of the piston of the intermediate pressure booster. The intermediate pressure intensifier consists of two cylinders, two pistons that reciprocate within the cylinders, and a rod that connects the pistons, with each chamber of one of the cylinders on the pressurizing side. The other chamber is the discharge side, and the hydraulic line from the intermediate pressure intensifier to the ultra-high pressure intensifier is provided with a check valve that opens with the pressure on the pressurizing side of the intermediate pressure intensifier, and the pressure of the hydraulic pressure source is A position correction valve is provided which drains the chamber on the discharge side of the intermediate pressure intensifier when the pressure rises and closes when the rod of the intermediate pressure intensifier is in position.

[Explanation of effects]

Therefore, since the intermediate pressure booster sends pressurized oil to the ultra-high pressure booster using one of the two cylinders, it is approximately twice as large as the hydraulic pressure generation source (in the case of a stroke in the direction where there is an area difference equal to the diameter of the piston rod). can apply more than double the amount of pressurized oil to the ultra-high pressure intensifier. If a phase difference occurs between the intermediate pressure booster and the ultra-high pressure booster due to a leak, the position correction valve can always correct the phase of both. That is, by using this ultra-high pressure intensifier, water is pressurized, for example, to obtain ultra-high pressure jet water in a tunnel excavation method using ultra-high pressure jet water.

By intermediately boosting the pressure oil from the hydraulic pump, the drive cylinder of the ultra-high pressure booster can be made smaller in diameter. Can generate pressure.

Since the cylinder of the ultra-high pressure booster has a small diameter, there is no operation switching detector (detection of piston attachment at both ends) on the ultra-high pressure booster side, so the operation switching of the ultra-high pressure booster is installed on the intermediate pressure booster side. Provide means to do so. This means detects the movement of the rod of the intermediate pressure booster using a sensor that detects the movement of the rod of the intermediate pressure booster, and controls switching of the operation of the ultra-high pressure booster based on the detected movement.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a hydraulic circuit embodying the present invention, and FIG. 2 is an external view of the device partially shown in cross section.

In FIGS. 1 and 2, the hydraulic pressure generated by the hydraulic pump 2 driven by the motor 3 is accumulated in the accumulator 8, and reaches the electromagnetic switching valve 9 with 4 ports and 3 positions, and the branched check valve 10A. , 10B to chambers 11A and 11D of an intermediate pressure booster, generally designated 11, respectively. The electromagnetic switching valve 9 is in the neutral position in the illustrated position, and when a signal is sent to the electromagnetic switching valve 9 by a signal from a control panel (not shown), the electromagnetic switching valve 9 switches to the chamber 11B of the intermediate pressure booster 11. Either the position where pressure oil is applied and the chamber 11C is drained to the tank port (hereinafter referred to as position A) or the position where pressure oil is applied to the chamber 11C and the chamber 11B is drained to the tank port (hereinafter referred to as position B). Can be switched to Note that the chamber 11A and chamber 11D are equipped with a check valve 10.
Pump pressure is constantly applied via A and 10B. In this way, the intermediate pressure booster 11 consists of two cylinders 16A and 16B, and the pistons 16C and 16D of each cylinder are connected to each other by a rod 16E. In the figure, reference numeral 51 denotes a connecting portion, which provides position signals to sensors 20A, 20B, 21A, and 21B, which will be described later.

Now, when the electromagnetic switching valve 9 is operated to position A or position B, one of the chambers 11B and 11C of the intermediate pressure booster 11 is pressurized and the other is drained. The pressurized piston side is connected to the pressure oil from the switching valve 9 and the check valve 1.
It is pressurized with pressure oil from 0A or 10B, and a check valve 1 is installed in the chamber 11A or 11D on the discharge side of the piston.
0A or 10B, no pressure oil is applied from the pump 2, so the chamber 11A on the discharge side of the piston
Alternatively, a pressure approximately twice as high as that generated by the pump is generated at 11D. Conversely, if chambers 11A and 11D are placed on the switching valve 9 side, the pressurizing area of chambers 11B and 11C is smaller by the diameter of the piston rod.
At B and 11C, a pressure twice the pump generated pressure +α is generated. In other words, the hydraulic pressure of the pump is controlled by check valve 1.
0A, 10B and into the head side of cylinders 11A, 11D, insert the rod side 11 of the cylinder.
When the same pressure is applied to either B or 11C, the area ratio on the head side of the cylinder on which it is applied will be approximately twice as much as the area ratio will be 1:2 (approximately twice as much due to the area of the piston rod) ) becomes the pressure.

The hydraulic pressure pressurized in either chamber 11A or 11D of intermediate pressure intensifier 11 is transferred to pilot check valve 12.
It passes through either A or 12D and is applied to an ultra-high pressure booster (ultra-high pressure intensifier), generally indicated by 13.

The drain from the ultra-high pressure booster 13 is discharged into the tank 1 through either the pilot check valve 12B or 12C.

Therefore, these pilot check valves 1
As shown in the figure, pilot pressure is applied to all of 2A to 12D. That is, the pilot check valves 12A and 12C have a chamber 11B.
A pilot line from the chamber 11C is connected to the pilot check valves 12B and 12D. Therefore, when pressure oil is supplied to the chamber 11B, the pilot check valves 12A, 12C open, and when pressure oil is applied to the chamber 11C, the pilot check valves 12B, 12C open.
12D opens.

For this purpose, pilot check valves 12A, 1
In 2D, one of the pressurizing sides of the electromagnetic switching valve 9 is opened, and the other is connected to the tank 1 and drained.

The pressure oil, which has been increased in pressure approximately twice in this way, is sent to the chambers 14A and 1 of the ultra-high pressure booster 13 via the hydraulic line 50.
Piston 14C enters either chamber of 4B.
The oil in the opposite chamber is drained through the hydraulic line 50. As the piston 14C operates, the small-diameter piston 15A moves to the left in FIG. At that time, the ultra-high pressure chamber 15D on the opposite side
Oil is drawn from line 32 through check valve 30. When the piston 14 moves to the right, ultra-high pressure is similarly generated in the pressure oil line 33 from the ultra-high pressure chamber 15D.

By increasing the pressure intermediately in this way, the drive cylinder 14 of the ultra-high pressure booster 13 can be made small in diameter, and the ultra-high pressure set by the diameters of the ultra-high pressure generation side pistons 15A and 15B and the pressure generated by the hydraulic pump 2 can be reduced. can occur.

Since the cylinder 14 of the ultra-high pressure booster 13 has a small diameter and is not provided with an operation switching detector (detection of piston attachment at both ends of the ultra-high pressure booster), for example, the movement of the piston 14C of the ultra-high pressure booster 13 is approximately equal to a predetermined stroke. Switch at 80%. For this purpose, switching sensors 20A and 20B are provided to detect the movement of the rod of the intermediate pressure booster 11.
A and 20B detect the movement of the rod 51 of the intermediate pressure booster 11, thereby controlling the operation switching of the ultra-high pressure booster 13.

However, leakage occurs in the intermediate pressure booster 11 and the cylinder 14 of the ultra-high pressure booster 13. Therefore, it is necessary to correct the mutual piston positions of the intermediate pressure booster 11 and the ultra-high pressure booster 13. If a phase shift of the pistons occurs between the two, the discharge pressure of the hydraulic pump 2 will naturally fluctuate.

Therefore, a relief detection pressure switch 7 is provided at the outlet of the relief valve 4 provided in the hydraulic pump 2,
Further, a check valve 5 and a flow control valve 6 are connected in parallel to the outlet thereof to drain the tank 1.

In this way, when the relief detection switch 7 detects that the pressure of the hydraulic pump 2 has changed, the oil in each chamber whose pressure is currently being increased among the pressure increasing side chambers 11A and 11D of the intermediate pressure intensifier 11 is transferred to the tank. A position correction valve 22 is provided for discharging to 1. This position correction valve 22 drains the pressure in either chamber 11A or 11D in response to a signal from the pressure switch.

When the pressure on the discharge side of the intermediate pressure booster 11 becomes lower than the pump pressure, the check valves 10A and 10B open and the pressure oil from the pump 2 flows into either the chambers 11A or 11D, which is disadvantageous. For this purpose, the drain line 60 leading to the tank 1 has a diaphragm 2.
3 to prevent the check valves 10A and 10B from opening unnecessarily.

The position correction valve 22 corrects the position of the piston of the intermediate pressure booster 11 due to this leakage. That is, as mentioned above, for example, the chamber 1 of the intermediate pressure booster 11
When pressure oil is applied to 1B and 11D and the piston moves to the left, if the piston 14C of the ultra-high pressure booster 13 moves to the right end due to leakage and becomes unable to move, naturally the pump 2
The discharge pressure increases. Then, the relief valve 4 opens and the switch 7 is activated. At this time, the position correction valve 22 is operated to drain the pressurized side chamber 11A. As a result, the piston of the intermediate pressure booster 11 can move to the left, for example, and when the position correction sensor 21A detects the stroke of the piston, the position correction valve 22 returns to the neutral position.

That is, this position correction operation is performed by the position correction sensor 2 provided at the normal operation switching position 20A, 20B of the ultra-high pressure booster 13 plus about 10%.
The pistons of the intermediate pressure booster 11 are operated to positions 1A and 21B, and when the position correction sensors 21A and 21B are activated, the position correction valve 22 is closed to return to normal operation.

Note that the tie rods 36 and 52 are subjected to repeated impact loads, so they must be replaced from time to time.

1 and 2, 32 is an inflow line for pressurized fluid, 33 is an outflow line, 30 is a check valve provided between the inflow line 32 and the ultra-high pressure booster 13, and 31 is an ultra-high pressure booster. 13
50 is a hydraulic line connecting the intermediate pressure booster 11 and the ultra-high pressure booster 13, and 8 is an accumulator.

[Effect of idea]

In this invention, an intermediate pressure booster is interposed between the hydraulic pressure generation source and the ultra-high pressure booster, and the crude oil from the hydraulic pressure generation source is pressurized by the intermediate pressure booster and then supplied to the ultra-high pressure booster. The drive cylinder of the ultra-high pressure booster can be made smaller in diameter, making the device smaller in diameter and lighter in weight, and the weight can be reduced by about 50% or less compared to conventional ones. Therefore, it becomes easy to move and transport a high-pressure water injection device incorporating this ultra-high pressure booster, for example, in the previously proposed tunnel excavation method using ultra-high pressure jet water.

In addition, since the drive cylinder of the ultra-high pressure booster has a small diameter, it is no longer possible to install an operation switching detector in the ultra-high pressure device, but a switching sensor that detects the movement of the piston rod is installed in the intermediate pressure booster to increase the ultra-high pressure. By detecting and controlling the movement of the pressure machine on the intermediate pressure booster side, the operation of the ultra-high pressure booster can be switched without any problem.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram of a pressure increasing device for generating ultra-high pressure according to an embodiment of the present invention, and FIG. 2 is an external view showing a part of the device in cross section. 1...Tank, 2...Hydraulic pump, 4...Relief valve, 7...Relief detection pressure switch, 9...
...Solenoid switching valve, 10A, 10B...Check valve,
11...Intermediate pressure booster, 12A, 12B...Pilot check valve, 13...Ultra high pressure booster, 14
... Drive cylinder, 20A, 20B ... Switching sensor, 21A, 21B ... Position correction sensor, 22
...Position correction valve, 23...Discharge flow rate control valve.

Claims (1)

[Scope of utility model registration request] An intermediate pressure booster is interposed between the hydraulic pressure generation source and the ultra-high pressure booster, and a sensor is provided to detect the movement of the rod of the intermediate pressure booster in order to detect the movement of the piston of the intermediate pressure booster. A pressure machine consists of two cylinders, two pistons that reciprocate within the cylinders, and a rod that connects the pistons. Each chamber on one side of these cylinders is the pressure side, and each chamber on the other side is the discharge side. The hydraulic line from the intermediate pressure booster to the ultra-high pressure booster is equipped with a check valve that opens when the pressure on the pressurizing side of the intermediate pressure booster increases, and when the pressure of the hydraulic pressure source increases, a check valve opens in the discharge side chamber of the intermediate pressure booster. 1. A pressure booster comprising a position correction valve that drains the pressure and closes when the rod of the intermediate pressure booster is positioned at a predetermined position.