High pressure generator with bidirectional check valves controlling overpressure

Patent metadata

Field	Value
Publication number	US-10422326-B2
Application number	US-201715801399-A
Country	US
Kind code	B2
Filing date	Nov 2, 2017
Priority date	Nov 30, 2016
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

An ultrahigh pressure generator is disclosed. The ultrahigh pressure generator has a pressure intensifier that discharges a fluid at ultrahigh pressure. The pressure intensifier uses a working medium and includes a double acting drive cylinder with a first compartment and a second compartment that are separated by a piston. A closed-circuit working medium pump drives the pressure intensifier by sucking and discharging the working medium from and to the first and second compartments. A collector collects the working medium from the first and second working medium channels into a tank. A low-pressure selector selects whether the working medium is discharged from the first or second compartment when the pressure of the working medium discharged toward the first or second compartment exceeds a predetermined threshold, and directs the selected working medium to the collector. The pressure generator manages the temperature of the working fluid appropriately.

First claim

What is claimed is:

1. An ultrahigh pressure generator, comprising:
a pressure intensifier configured to discharge a fluid, the pressure intensifier including
a piston configured to be driven by a working medium,
a double-acting drive cylinder having a first compartment and a second compartment that are separated by the piston,
a high-pressure cylinder configured to discharge the fluid, and
a plunger configured to reciprocate in the high-pressure cylinder together with the piston;

a closed-circuit working medium pump having a first port and a second port being an inlet port and an outlet port, respectively, for the working medium, the closed-circuit working medium pump being configured to drive the pressure intensifier by sucking and discharging the working medium from and to the first compartment and the second compartment respectively through the first port and the second port;
a first working medium channel connecting the first compartment and the first port;
a second working medium channel connecting the second compartment and the second port;
a tank configured to store the working medium;
a feed circuit configured to feed the working medium from the tank to the first working medium channel and the second working medium channel;
a collector configured to collect the working medium from the first working medium channel and the second working medium channel into the tank; and
a low-pressure selector configured to select, when the pressure of the working medium discharged toward the first compartment or the second compartment exceeds a predetermined threshold, the working medium discharged from one of the first compartment and the second compartment, and direct the selected working medium to the collector;
wherein the low-pressure selector includes
a first low-pressure selector switch circuit configured to select, when the pressure of the working medium discharged toward the first compartment exceeds the predetermined threshold, the working medium discharged from the second compartment, and direct the selected working medium to the collector, and
a second low-pressure selector switch circuit configured to select, when the pressure of the working medium discharged toward the second compartment exceeds the predetermined threshold, the working medium discharged from the first compartment, and direct the selected working medium to the collector.

2. The ultrahigh pressure generator according to claim 1 , wherein the low-pressure selector includes
a first check valve having a downstream end connecting to the first working medium channel;
a second check valve having a downstream end connecting to the second working medium channel;
a low-pressure channel connecting an upstream end of the first check valve and the second check valve to the collector;
a first switch channel connecting the first working medium channel to the upstream end of the second check valve; and
a second switch channel connecting the second working medium channel to the upstream end of the first check valve.

3. The ultrahigh pressure generator according to claim 2 , further comprising:
a high-pressure selector configured to select the working medium discharged from one of the first compartment and the second compartment, and direct the selected working medium to the collector,
wherein the low-pressure selector is arranged between the high-pressure selector and the pressure intensifier.

4. The ultrahigh pressure generator according to claim 1 , further comprising:
a high-pressure selector configured to select the working medium discharged from one of the first compartment and the second compartment, and direct the selected working medium to the collector,
wherein the low-pressure selector is arranged between the high-pressure selector and the pressure intensifier.

5. An ultrahigh pressure generator, comprising:
a pressure intensifier configured to discharge a fluid, the pressure intensifier including
a piston configured to be driven by a working medium,
a double-acting drive cylinder having a first compartment and a second compartment that are separated by the piston,
a high-pressure cylinder configured to discharge the fluid, and
a plunger configured to reciprocate in the high-pressure cylinder together with the piston;

a closed-circuit working medium pump having a first port and a second port being an inlet port and an outlet port, respectively, for the working medium, the closed-circuit working medium pump being configured to drive the pressure intensifier by sucking and discharging the working medium from and to the first compartment and the second compartment respectively through the first port and the second port;
a first working medium channel connecting the first compartment and the first port;
a second working medium channel connecting the second compartment and the second port;
a tank configured to store the working medium;
a feed circuit configured to feed the working medium from the tank to the first working medium channel and the second working medium channel;
a collector configured to collect the working medium from the first working medium channel and the second working medium channel into the tank; and
a low-pressure selector configured to select, when the pressure of the working medium discharged toward the first compartment or the second compartment exceeds a predetermined threshold, the working medium discharged from one of the first compartment and the second compartment, and direct the selected working medium to the collector;
wherein the low-pressure selector includes
a first check valve having a downstream end connecting to the first working medium channel;
a second check valve having a downstream end connecting to the second working medium channel;
a low-pressure channel connecting an upstream end of the first check valve and the second check valve to the collector;
a first switch channel connecting the first working medium channel to the upstream end of the second check valve; and
a second switch channel connecting the second working medium channel to the upstream end of the first check valve.

6. The ultrahigh pressure generator according to claim 5 , further comprising:
a high-pressure selector configured to select the working medium discharged from one of the first compartment and the second compartment, and direct the selected working medium to the collector,
wherein the low-pressure selector is arranged between the high-pressure selector and the pressure intensifier.

Assignees

• Sugino Mach

Inventors

• Sato Sho

Classifications

• F04B7/02

  the valving being fluid-actuated · CPC title

• F04B5/02

  with double-acting pistons · CPC title

• F04B51/00

  Testing machines, pumps, or pumping installations · CPC title

• F04B7/003

  and having a slidable movement · CPC title

• F04B49/22

  by means of valves (F04B49/03 takes precedence) · CPC title