JPS62135675A - High pressure generating device - Google Patents

Abstract

PURPOSE:To easily control the quantity of discharge of a secondary liquid by embedding a coil which constitutes a differential transformer in a barrel and, thereby, detecting the stroke position of a piston, and shifting the feed passage of a primary liquid to a primary liquid chamber. CONSTITUTION:A high-pressure working fluid as a primary liquid is fed into the primary liquid chamber 13' of a barrel 5 from the primary port 2a' of a cylinder block 2 via a piping 17'. Thereupon, since a primary side piston 10 is moved leftward while pressing a secondary side piston 11 leftward, a cleaning water fed into the secondary liquid chamber 14 of a barrel 6 is compressed with a pressure corresponding to the ratio of the pressing areas of the pistons 10, 11, being fed under pressure to an injection nozzle via a one-way valve 8. Due to the leftward travel of the primary side piston 10, voltage taken out of a coil 19 is linearly varied, which is detected by a control unit 21 to detect the stroke position of a piston 12, thereby, shifting an electromagnetic selector valve 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-pressure generating device that sprays high-pressure liquid from a nozzle to perform cleaning, deburring, etc.

(Prior art and its problems) Conventionally, cleaning of deposits on the inside of pipes and other various equipment.

It is widely known that a jet flow of high-pressure fluid is used to peel off rusted or deteriorated surfaces, or to remove deburrs from processed products. A pressure transducer in a high pressure generator used for such work generally has a piston with a large piston and a small piston installed in a barrel each having a pair of large-diameter primary liquid chambers and a small-diameter secondary liquid chamber. The large piston is driven to reciprocate by the primary liquid that is fitted and alternately supplied to the primary liquid chamber.

The small piston is configured to reciprocate together with the large piston to increase the pressure of the secondary liquid to be supplied to the secondary liquid chamber and forcefully send it to the ejection nozzle.

By the way, in order to switch the operating direction of the piston, that is, to switch the primary liquid that is alternately supplied to the pair of primary liquid chambers, a limit switch is installed at a predetermined position of the pressure transducer, and a limit switch is installed at a predetermined position of the pressure transducer. is detected by the limit switch, and thereby the electromagnetic switching valve is operated differentially to switch the primary liquid supply flow path, so that the primary liquid is alternately supplied to the pair of primary liquid chambers.

However, in this switching method using a limit switch, if you want to change the discharge amount of the secondary liquid, you have to change the installation position of the limit switch.
There have been problems in that the discharge amount cannot be easily controlled, and the limit switch is prone to failure because it operates by contact.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and it facilitates control of the discharge amount of secondary liquid by enabling continuous position detection of the piston stroke. An object of the present invention is to provide a high-pressure generating device that can avoid failures in the system.

(Structure of the Invention) In order to achieve the above object, the present invention includes a large-diameter primary piston inside a barrel each having a pair of large-diameter primary liquid chambers and a small-diameter secondary liquid chamber. A piston provided with a small-diameter secondary piston is movably inserted into the piston, and the primary liquid is alternately supplied to the primary liquid chamber to reciprocate the primary piston, thereby reciprocating the secondary piston. In the high pressure generator equipped with a pressure transducer that increases the pressure of the secondary liquid to be supplied to the secondary liquid chamber by increasing the pressure, a coil constituting a differential transformer is embedded in the barrel, and a coil constituting a differential transformer is embedded in the barrel, and The stroke position of the piston is detected by detecting the voltage of the coil that changes accordingly, and the passage for supplying the primary liquid to the primary liquid chamber is thereby switched.

(Example) Hereinafter, one example of the present invention will be described based on the accompanying drawings.

In the figure, the housing of the pressure transducer 1 includes a first cylinder block 2, a second cylinder block 3,3' fixed to both ends of the first cylinder block 2, and each of these second cylinder blocks 3. .3' is fixed to the check valve block 4.4'.

A large-diameter primary barrel 5 is press-fitted into the first cylinder block 2, and primary liquid ports 2a are provided at both ends.

2'a is provided.

Secondary barrels 6.6' having a smaller diameter than the primary barrel 5 are press-fitted into the cylinder blocks 3, 3', and each of these secondary barrels 6.6' is on both sides of the primary barrel 5. and concentrically arranged.

Inlet ports 4a, 4 of check valve blocks 4, 4'
'a and outlet ports 4b, 4'b have one-way valves 7,
7' and 8,8' are arranged, and these one-way valves 7 and 8
, 7' and 8'.

4'c connects the secondary barrel 6°6 through passages 4d and 4'd.
It communicates with a secondary liquid chamber 14, 14', which will be described later, inside the chamber.

One side open end of cylinder blocks 3, 3' is fluid-tightly fitted to both open ends of the cylinder block 2 via a high-pressure seal part, and the other side open end of each cylinder block 3, 3' is fitted, respectively. Communication holes 4d, 4 of check valve blocks 4, 4'
The open end of 'd is fitted liquid-tightly through the high pressure seal part,
These respective cylinder blocks 2, 3.3' and check valve blocks 4, 4' are securely fixed collinearly by bolts 9, 9'.

A large-diameter primary piston 10 constituting a piston 12 is slidably inserted into the primary barrel 5, and on both sides of the primary piston 10 are small-diameter secondary pistons 11.1.
1' are connected to the secondary side barrels 6 and 6', respectively.
It is slidably inserted inside. Inside these barrels 5, 6.6' are the primary and secondary pistons 1.
A pair of primary liquid chambers 13 are formed by 0,11゜11' respectively.
．． 13' and a secondary liquid chamber 14.14' are defined.

each primary liquid boat 2a of the first cylinder block 2;
2'a is connected to an electromagnetic switching valve 15 via a pipe 17, 17', and the switching valve 15 is connected to a primary liquid tank 18 via a pipe 23 and a pipe 24 with a hydraulic pump 16 installed in the middle. There is.

A coil 19 constituting a differential transformer is buried inside the primary barrel 5, and the coil 19 is connected to the wiring 2.
0 to a control unit 21, and the control unit 21 is further connected to the electromagnetic switching valve 15 via a wiring 22. Therefore, when the primary piston 10 moves within the primary barrel 5, the voltage taken out from the coil 19 of the differential transformer changes linearly, so by detecting this voltage change in the control unit 21, the primary side The stroke position of the piston 10 can be known. Then, this voltage change is fed back to the electromagnetic switching valve 15.
By operating 5, the operating direction of the piston 12 can be switched.

Each inlet boat 4a of check valve blocks 4, 4'
, 4'a are connected to a supply tank (not shown) for a secondary liquid 1, such as wash water, and each outlet port 4b.

4'b are assembled and connected to an injection nozzle (not shown).

(Function) In the figure, when high-pressure hydraulic oil as primary liquid is supplied from one primary liquid port 2'a of cylinder block 2 to one primary liquid chamber 13' in barrel 5 via piping 17', The primary piston 1o is pressed and moves to the left in the figure, and accordingly the secondary piston 11 is pressed to the left in the figure, depending on the ratio of the suppressed areas of the pistons 10 and 11. The cleaning water supplied to the secondary liquid chamber 14 in the barrel 6 is compressed under the same pressure and is force-fed to the injection nozzle via the one-way valve 8. No one way valve 7
' is opened and cleaning water flows into the secondary liquid chamber 14' in the barrel 6'.
is inhaled.

Due to the leftward movement of the primary piston 1o, the coil 1
Since the voltage taken out from the valve 9 changes linearly, the stroke position of the piston 12 is detected by detecting a preset voltage value with the control unit 21, which operates the electromagnetic switching valve 15 to reduce the hydraulic oil. Switch the flow path.

That is, this time, the other primary liquid boat 2a is
Since hydraulic oil is supplied to the other primary liquid chamber 13 from -
The blowing piston 10 is moved to the right in the figure, and the secondary piston 11' compresses the cleaning water in the secondary liquid chamber 14' and forces it to the injection nozzle via the one-way valve 8' for injection. be done. On the other hand, as the secondary piston 11 moves to the right, the one-way valve 7 is opened and cleaning water is sucked into the secondary liquid chamber 14.

Thereafter, the above operation is repeated, and high-pressure cleaning water is injected from the injection nozzle.

In addition, the coil 19 of the differential transformer is connected to the secondary barrel 6.6.
The primary liquid supply flow path to the primary liquid chamber 13.13' may be switched by embedding the primary liquid in the primary liquid chamber 13.13' by detecting the displacement of the secondary piston 11.11'.

(Effects of the Invention) As explained above, the present invention provides a large-diameter primary piston and a small-diameter secondary piston inside a barrel each having a pair of large-diameter primary liquid chambers and a small-diameter secondary liquid chamber. A piston provided with a piston is slidably inserted into the primary liquid chamber, and the primary liquid is alternately supplied to the primary liquid chamber to reciprocate the primary piston, thereby reciprocating the secondary piston to In a high-pressure generator equipped with a pressure transducer configured to increase pressure and send out a secondary liquid to be supplied to a liquid chamber, a coil constituting a differential transformer is embedded in the barrel, and the pressure changes according to the displacement of the piston. The stroke position of the piston is detected by detecting the voltage of the coil, and the supply path of the primary liquid to the primary liquid chamber is thereby switched, so that the stroke position of the piston can be continuously detected. Therefore, an arbitrary stroke width can be set, the stroke width can be easily changed, and the discharge amount of the secondary liquid can be easily controlled.

Further, since the piston position sensor is a non-contact type, failure of the sensor is avoided and durability is improved, and furthermore, since the coil is embedded in the barrel, space can be used effectively.

[Brief explanation of drawings]

The figure is an overall configuration diagram showing an embodiment of the high pressure generator of the present invention. 1...Pressure transducer, 5, 6.6'...Barrel, 10
...Large diameter piston, 11.11'...Small diameter piston, 12...Piston, 13.13'...-Coating liquid chamber, 14°14'...Secondary liquid chamber, 17.17 '...
Piping (supply channel), 19...coil.

Claims (1)

[Claims] 1. A piston provided with a large-diameter primary piston and a small-diameter secondary piston is slidably inserted into a barrel each having a pair of large-diameter primary liquid chambers and a small-diameter secondary liquid chamber, By reciprocating the primary piston with the primary liquid alternately supplied to the primary liquid chamber, the secondary piston is reciprocated to send out the secondary liquid to be supplied to the secondary liquid chamber under increased pressure. In a high pressure generator equipped with a pressure transducer, a coil constituting a differential transformer is embedded in the barrel, and the stroke position of the piston is detected by detecting the voltage of the coil that changes according to the displacement of the piston. A high pressure generating device characterized in that the supply path of the primary liquid to the primary liquid chamber is thereby switched.