JPS62106102A - Pressure transducer - Google Patents

Abstract

PURPOSE:To enable injection pressure and injection quantity of a secondary liquid to be variably controlled by fitting a sleeve stepwise movably to the outer periphery of a barrel as well as storing a plurality of pistons with different diameters into the barrel. CONSTITUTION:A sleeve 24 provided with inlet ports 25-27 and outlet parts 28-30 is tepwise movably fitted to the outer periphery of a barrel 15 as well as a plurality of pistons 19-21 having different diameters are slidably stored in the barrel 15 into which a primary liquid port 23 and secondary liquid inlet ports 16a-18a and outlet ports 16b-18b drilled. Since pistons 19-21 having desired push/press areas can be selected for operation by moving the sleeve 24 by the above mechanism, injection pressure and injection quantity of a secondary liquid can be variably controlled.

Description

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

(Prior art and its problems) Conventionally, it has been widely known that jet flow of high-pressure fluid is used to clean deposits on the inside of pipes and other various equipment, peel off rust and altered surfaces, and remove flakes from processed products. There is. A pressure transducer in a high-pressure generator used for such work generally has a barrel with a large-diameter primary liquid chamber and a small-diameter secondary liquid chamber, with a large screw and a small piston integrally installed. The large piston is reciprocated by the primary liquid supplied to the blowing chamber, and the small piston is reciprocated together with the large piston to supply the secondary liquid to the secondary liquid chamber. It is configured to increase the pressure of the liquid and forcefully send it to the jetting nozzle.

However, in the pressure transducer with the above configuration, the large piston and small piston are integrally constructed, and the suppression area of the small piston that suppresses the secondary liquid cannot be changed. The problem was that the injection pressure and injection amount were constant, and they could not be variably controlled.

(Objective of the Invention) The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a pressure transducer that can arbitrarily variably control the injection pressure and injection amount of secondary liquid.

(Structure of the Invention) In order to achieve the above object, the present invention has a plurality of chambers each having a different inner diameter, which are formed in communication with each other, and a primary liquid port is bored at one end side of the largest diameter chamber among the chambers. , a barrel having an inlet port and an outlet port for the secondary liquid at the other end of each chamber, and a barrel having a diameter corresponding to the inner diameter of each chamber of the barrel and slidably housed in each chamber. a plurality of independent pistons, a secondary liquid inlet port movably fitted to the outer periphery of the barrel in stages and communicating with any of the inlet ports of the barrel at each stage, and an outlet port of the barrel at each stage; and sleeves each having a secondary liquid outlet port that can communicate with either of the two.

(Example) Hereinafter, a cleaning device showing an example of the pressure transducer according to the present invention in the drawings will be specifically described.

This cleaning device is roughly divided into a primary liquid sending unit 1 that sends hydraulic oil as a secondary liquid, a pressure transducer 2 that sends cleaning liquid as a secondary liquid to a nozzle 4 under increased pressure by the secondary liquid, and It is comprised of a control unit 3 that controls the injection pressure and injection amount of the secondary liquid from the nozzle 4.

In the above-mentioned blower delivery unit 1, for example, four rows of row-type fuel injection pumps (hereinafter simply referred to as pumps) 6a, 6b, 6
c and 6d are fixed.

The pumps 6a, . . . , 6d have substantially the same specifications as the in-line fuel injection pumps of diesel engines used in vehicles, and in FIG. 1, four-cylinder pumps are used. A gear 8 is fixed to the camshaft 7 of each pump 6a, . . . , 6d, and these gears 8 mesh with a gear 10 fixed to the motor shaft 9 of the drive motor 5. Therefore, when the drive motor 5 rotates, the camshaft 7 rotates via the gears 10 and 8, and the pump 6a,
....

A plunger (not shown) of each cylinder 6d moves to send out the primary liquid under pressure. Further, the amount of the next liquid to be delivered can be determined by rotating the plunger using a control rack 11 attached to each pump 6a, . . . , 6d and adjusting the communication position of the communication groove between the plunger and the barrel. , and can vary from zero to maximum flow rate.

The actuator 12 that drives the control rack 11 is operated in response to a command from the control unit 3. Each pump 6a.

..., 6d is supplied with hydraulic oil from the primary liquid tank 13 via the flow path 14. Note that as a means for transmitting power from the drive motor 5 to each camshaft 7, a belt or other means may be used.

Next, the pressure transducer 2 according to the present invention will be described. Inside the barrel 15, which has a bilaterally symmetrical structure, there are a pair of large diameter chambers 1.
6. Medium diameter chamber 17. A small diameter chamber 18 is provided, and each of the chambers 16, 17. Medium diameter piston 20. A small diameter piston 21 is slidably inserted. Each room 16,
Secondary liquid inlet ports 16a, 17a, 18a and outlet ports 1-16b, 17b, 18b are bored between the outer ends of the barrels 17 and 18 and the outer peripheral surface of the barrel 15, respectively. Further, a primary liquid chamber 22 is defined at the inner end of the large diameter chamber 16 by one end surface of the large diameter piston 19, and a space between the blowing chamber 22 and the outer circumferential surface of the barrel 15 is A primary liquid port 23 is bored.

A sleeve 24 is fitted onto the outer peripheral surface of the barrel 15 so as to be slidable in the axial direction. The sleeve 24 is configured to move in three steps in the axial direction by a drive device 48, such as a three-step solenoid. Then, each inlet port 16a of the barrel 15 according to each stage.
, 17a, and 18a are provided with secondary liquid inlet ports 25, 26, and 27. In other words, in the state shown in Figure 1, inlet port 1
6a and 25 match, in FIG. 2 the inlet ports 17a and 26 match, and in FIG. 3 the inlet ports 18a and 27 match. Furthermore, in the upper part of the sleeve 24 are respective outlet ports 16b, 17b of the barrel 15 at any stage of movement of the sleeve 24.

Three outlet ports 28, 29, and 30 are each drilled in alignment with and in communication with 18b.

In said inlet port 25.26.27 of sleeve 24.

Cleaning liquid is supplied from a secondary liquid tank 31 through a flow path 34 via a pump 32 and each check valve 33 . Further, the outlet port 28, 29, 30 is connected to the flow path 3 through a check valve 35.
6 to the nozzle 4.

The control unit 3 controls the supply of blowing gas, the step change of the sleeve 24 of the pressure transducer 2, and the like. That is, by controlling the rotation of the motor 5 via a motor switch 37 provided at the bottom of the drive motor 5, and operating the control rack 11 via the actuator 12, each pump 6a, . . .
Controls the amount of primary liquid delivered from 6d. Further, by moving the sleeve 24 in steps, the injection pressure and injection amount of the secondary liquid are controlled as described later.

In addition, among the pumps of the blowing and delivery unit 1, the discharge ports 38 and 39 of the two rows of pumps 6a and 6b are collected in a flow path 40 and connected to one primary liquid port 23 of the pressure transducer 2. and the other two rows of pumps 6c.

The respective discharge ports 41, 42 of 6d are collected in a flow path 43 and connected to the other primary liquid port 23.

Pressure sensors 44, 45.46 are provided in the flow path 40.43 and the flow path 36, respectively, and when abnormal pressure in each flow path 40, 43.36 is detected, an alarm is sent from the control unit 3. The control rack 11 can be controlled by the command to stop the delivery of the primary liquid and the injection of the secondary liquid. Further, a contact sensor (not shown) is provided inside the nozzle 4, which detects the workpiece 47 in the cleaning area, controls the control rack 11 based on a command from the control unit 3, and controls the secondary liquid. The injection amount and injection pressure can be controlled to predetermined values.

(Function) First, as shown in FIG.
A case will be described in which the inlet port 16a of the sleeve 24 and the inlet port 25 of the sleeve 24 match and communicate with each other. When the drive motor 5 rotates according to a command from the control unit 3,
Each camshaft 7 rotates via gears 1o and 8, and primary liquid is sent out from each pump 6a, . . . , 6d. In that case, pump 6a.

The primary liquid from pump 6b is sent under pressure to one primary liquid chamber 22 of the pressure transducer 2 through a flow path 40, and the primary liquid from the other pumps 6c and 6d is sent under pressure to the other primary liquid chamber 22 through a flow path 43. be done. As a result, each large-diameter piston 19 moves outwardly (
In order to move to the medium-diameter piston 20 side), the secondary liquid that has been sucked into the large-diameter chamber 16 from the secondary liquid tank 31 through the flow path 34 and each inlet port 25.16a is transferred to the large-diameter piston 20 side). 19 suppresses each outlet port 16b, 2
8 through the flow path 36 to the nozzle 4 where it is injected. Next, when the secondary liquid is supplied from the secondary liquid tank 31 to the inlet port 25.16a through the flow path 34, each large diameter piston 19 is pressed by the secondary liquid and moves in the opposite direction, that is, inward. so that each - next liquid chamber 2
The primary liquid of 2 passes through channels 40 and 43 to each pump 6a,
..., it is returned to 6d. By repeating the above operations, the secondary liquid is intermittently injected from the nozzle.

Next, as shown in FIG. 2, when the sleeve 24 of the pressure transducer 2 is moved one step to the right, the inlet port 26 of the sleeve 24 and the inlet port 17a of the barrel 15 match.
It becomes connected. Therefore, the secondary liquid is introduced into the inlet port 26.
17a, each medium diameter piston 20 is pressed and moves inward (toward the large diameter piston 19 side), and the secondary liquid accumulates in the medium diameter chamber 17. Next, when the drive motor 5 is operated to forcefully feed the primary liquid to each blowing chamber 22, the large diameter piston 19 and the medium diameter piston 20 move outward as a unit, so that the inside of the medium diameter chamber 17 is The secondary liquid is suppressed by the medium-diameter piston 20 and is forced to be sent to the nozzle 4 through the flow path 36 from the outlet ports 17b and 29, and is injected. In this case, the area of the end face (repression surface) of the medium-diameter screw 1-2o is reduced to a ratio of that of the large-diameter piston 19, so the discharge of the secondary liquid to be injected is reduced to a ratio of that of the large-diameter piston 19. However, the injection pressure will increase.

When the sleeve 24 is moved one step further to the right as shown in FIG. 3, the inlet ports 27 and 18a match and communicate with each other, so when the secondary liquid is supplied from the inlet ports 27 and 18a, each small diameter The pistons 21 each move inward, and the secondary liquid accumulates in the small diameter chamber 18. Therefore,
- When the secondary liquid is pumped into the primary liquid chamber 22, the large diameter piston 1
9. Since the medium-diameter piston 20 and the small-diameter piston 21 move outward together, the secondary liquid is pressed by the small-diameter piston 21, which has a smaller suppression area, and is force-fed to the nozzle 4 and sprayed. Therefore, the injection amount is further reduced compared to the case shown in FIG. 2, but the injection pressure is further increased.

As described above, by moving the sleeve 24 and selecting the secondary liquid inlet port of the barrel 15, the secondary liquid can be force-fed and injected by a piston having a desired suppression area, so that the injection pressure It is also possible to variably control the injection amount.

In addition, each pump 6 is controlled by the control rack 11.
Since it is possible to control the amount of primary liquid sent out from a, .

Although the pressure transducer of the above embodiment is configured to be variably controlled in three stages, the present invention is not limited to this. Further, although the sleeve 24 is configured to be able to slide in the axial direction, it may also be configured so that a desired secondary liquid inlet port of the barrel 15 can be selected by rotating the sleeve 24 in the circumferential direction around the barrel 15. good. Furthermore,
The pressure transducer does not have to be bilaterally symmetrical as in the embodiment, and may be configured only on one side.

- In the blowing delivery section 1, the drive motor 5 is used as in the embodiment.
If it is arranged in a vertical shape and a plurality of rows of pumps 6a, 6b, . . . are attached to the outer periphery of the casing,
- The diameter of the blower delivery section 1 can be reduced.

(Effects of the Invention) As explained above, in the pressure transducer of the present invention, a plurality of chambers having different inner diameters are formed in communication with each other, and the primary liquid bowl 1 is connected to one end of the largest diameter chamber among the chambers. A barrel is provided with a secondary liquid inlet port and an outlet port on the other end side of each chamber.

a plurality of independent pistons each having a diameter corresponding to the inner diameter of each chamber of the barrel and slidably housed in each chamber;
a secondary liquid inlet port that is movably fitted to the outer periphery of the barrel in stages and that can communicate with any of the inlet ports of the barrel at each stage; and two secondary liquid inlet ports that can communicate with any of the outlet ports of the barrel at each stage; It consists of a sleeve with an outlet port for the next liquid.
By moving the sleeve, a piston with a desired suppression area can be selected and activated. Therefore, there is a great advantage that the injection pressure and injection amount of the secondary liquid can be arbitrarily and variably controlled.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a cleaning device in which the pressure transducer of the present invention is used, and FIGS. 2 and 3 are sectional views of essential parts showing the state of step conversion of the pressure transducer, respectively. be. 2. Pressure transducer, 15... Barrel, 16, 17° 18
... Chamber, 16 a, , 17 a, L 8 a
...Inlet port, 16b, 17b, 18b...Outlet port, 19,20°21...Piston, 23...
-Blowing port, 24・Sleeve, 25, 26.27・
・Inlet port, 28°29.30...Outlet port.

Claims (1)

[Claims] 1. A plurality of chambers each having a different inner diameter are formed in communication,
A barrel having a primary liquid port bored at one end of the largest diameter chamber among those chambers, and a secondary liquid inlet port and outlet port bored at the other end of each chamber, and each of the barrels. A plurality of independent pistons each have a diameter corresponding to the inner diameter of the chamber and are slidably housed in each chamber, and a plurality of independent pistons are fitted to the outer periphery of the barrel so as to be movable in stages, and the pistons are movably moved in stages at each stage. A pressure transducer comprising a sleeve each having a secondary liquid inlet port that can communicate with any of the inlet ports and a secondary liquid outlet port that can communicate with any of the outlet ports of the barrel at each stage.