JPH11226463A - Pressurized washing liquid jetting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device by which pressurized washing liquid can be effec tively, continuously jetted without increasing pollutant sources. SOLUTION: In the pressurized washing liquid jetting device provided with a pressurized liquid source 1 for washing liquid, a liquid sending line 2 connected to the pressurized liquid source, an ejector 16 installed at the head of the liquid sending line, and an intensifier 3 connected in mid-way of the liquid sending line and for enabling increasing liquid pressure in tube by action of a pneumatic piston 4. After the liquid sending line 2 is branched into two directions away from the pressurized liquid source 1, the branches are joined and the joined line leads to the ejector 16, and also the intensifier 3 is of a double acting type in which liquid pressurizing pistons 7a, 7b are connected to the pneumatic piston 4 on both sides thereof through piston rods 5a, 5b. To one and the other of the liquid sending branches, one and the other head chambers 6a, 6b of the liquid pressure piston are connected respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning pressure liquid spraying apparatus, and can be suitably used particularly for spraying a cleaning liquid for cleaning mechanical parts and electronic parts.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional cleaning pressure liquid injection device includes a liquid pressure source 31 for a cleaning liquid such as pure water and a liquid supply pipe 3.
2. It has a nozzle 33 and an intensifier 34 as an injection port. The cleaning liquid exits from the hydraulic pressure source 31 and passes through the liquid sending pipe 32,
It is filtered by the filter 35 and sent to the nozzle 33. A pressure intensifier 34 is connected in the middle of the liquid feeding pipe 32, and check valves 36 and 37 are provided upstream and downstream of the pressure intensifier 34, respectively.
Is provided. Therefore, the cleaning liquid supplied from the hydraulic pressure source 31 is boosted in pressure by the pressure intensifier 34 and is jetted from the nozzle 33 vigorously.

The pressure intensifier 34 has a built-in pneumatic piston 38 to which a hydraulic piston 40 is connected via a piston rod 39. The head of the hydraulic piston 40 contacts the liquid in the tube. The pressure intensifier 34 can use a compressor or the like as an air pressure source 41, and both pressure chambers of a piston rod chamber 42 on the hydraulic piston side of the pneumatic piston 38 and an air pressure head chamber 43 on the opposite side can communicate with the air pressure source 41. It is double acting. Between the two pressure chambers and the air pressure source 41, the air pressure source 41
A switching valve 44 is provided for switching between air supply from the outside and exhaust to the outside alternately. FIG.
The right side of the switching valve 44 is operated to complete the exhaust from the piston rod chamber 42 and the air supply to the pneumatic head chamber 43, and shows a state in which the cleaning liquid is injected from the nozzle 33.

In order to inject the cleaning pressure liquid from the nozzle 33 again from this state, first, the switching valve 44 is switched to the left to discharge the compressed air in the pneumatic head chamber 43 from the muffler 45a, and at the same time, the air pressure adjusting unit 46 By sending the adjusted compressed air to the piston rod chamber 42, the pneumatic piston 38 is once retracted to the right. Then, the hydraulic piston 40 returns to the right side accordingly, and the hydraulic pressure source 31
Is supplied to the hydraulic head chamber 47.
Next, the switching valve 44 is switched to the right side to discharge the compressed air in the piston rod chamber 42 from the silencer 45b, and at the same time, the compressed air adjusted by the air pressure adjusting unit 46 is sent to the pneumatic head chamber 43, so that the pneumatic piston 3
Advance 8 to the left. Then, the hydraulic piston 40 is accordingly pushed to the left, and the cleaning liquid filled in the hydraulic head chamber 47 is jetted at an injection pressure corresponding to the product of the set pressure of the air pressure adjusting unit 46 and the pressure increase ratio of the pressure intensifier 34. Nozzle 33
Injected from. The problem with this device is that the hydraulic head chamber 4
7 is that the cleaning liquid cannot be ejected from the nozzle 33 while the cleaning liquid is being filled in the nozzle 7.

FIG. 4 shows the intensifier 34 and the nozzle 3 of the apparatus shown in FIG.
3, an accumulator 48 and a pressure reducing valve 49 are attached. According to this device, the hydraulic head chamber 47
The pressurized cleaning liquid is also supplied from the accumulator 48 while the hydraulic piston 40 is retracted to the right in order to fill the cleaning liquid with the cleaning liquid, and is injected from the nozzle 33 via the pressure reducing valve 49. Therefore, the cleaning liquid is continuously sprayed while the hydraulic head chamber 47 is being filled with the cleaning liquid.

[0006]

However, in the apparatus shown in FIG. 4, the size is increased by the addition of the accumulator 48 and the pressure reducing valve 49. Further, a new contamination source such as abrasion powder generated from a sliding portion of the accumulator or the pressure reducing valve or bacteria growing in the liquid retaining portion of the accumulator or the pressure reducing valve is generated, which is not preferable as the cleaning liquid generator. Further, in order to hold the cleaning liquid having a stable injection pressure at the outlet side of the pressure reducing valve 49, the injection pressure of the nozzle 33 of the apparatus of FIG.
It is necessary to supply a cleaning liquid having a pressure as high as a to the inlet side of the pressure reducing valve 49. Therefore, the loss energy is large. Therefore, an object of the present invention is to provide an apparatus capable of efficiently and continuously ejecting a cleaning pressure liquid without increasing the number of contamination sources.

[0007]

In order to achieve the object, the present invention provides a liquid pressure source for a cleaning liquid, a liquid supply pipe connected to the liquid pressure source, an injection port provided at a tip of the liquid supply pipe, and In a cleaning pressure liquid ejecting apparatus provided with a pressure intensifier connected in the middle of a liquid sending pipe and capable of increasing a liquid pressure in the pipe by an operation of a pneumatic piston, the liquid sending pipe branches away from a liquid pressure source in two directions. The pressure intensifier is a double-acting type in which a hydraulic piston is connected via a piston rod to both sides of a pneumatic piston. And the head chamber of the other hydraulic piston is connected to the other liquid feed pipe.

In the apparatus according to the present invention, the pressure intensifier is of a double-acting type, and when one hydraulic piston retreats and fills the hydraulic head chamber with liquid, the other hydraulic piston advances to supply liquid. Since it is extruded, the cleaning liquid having a constant pressure is continuously sprayed from the spray port. That is, without going through the pressure reducing valve,
The cleaning liquid at a constant pressure can be injected only by the primary pressure of the hydraulic piston. Therefore, neither an accumulator nor a pressure reducing valve is required.

However, in the apparatus of the present invention, an accumulator may be connected to the junction of the branched liquid supply pipes. Thereby, the pressure fluctuation at the junction point at the time of the direction change of the pneumatic piston can be suppressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. The piping for passing the compressed air is the same as the configuration shown in FIG. The difference from FIG. 3 is that the liquid feed pipe 2 emitted from the hydraulic pressure source 1 branches in two directions on the upstream side of the pressure intensifier 3 and then joins on the downstream side to reach the injection port. Further, the pressure intensifier 3 is a double-acting type as in FIG. 3, but the piston rods 5a and 5b are provided on both sides of the pneumatic piston 4, respectively.
In that the hydraulic pistons 7a, 7b are connected via The head chamber 6a of the hydraulic piston 7a is connected to one side of the branched liquid feed pipe 2 by the head chamber 6 of the hydraulic piston 7b.
b is connected to the other liquid feed pipes, respectively. Liquid sending pipe 2
Check valves 11a, 11b between the branch point of
However, check valves 12a and 12b are provided between the pressure intensifier 3 and the confluence of the liquid sending pipe 2.

In FIG. 1, the right side of the switching valve 14 is operated to complete the exhaust from one piston rod chamber 17b and the air supply to the other piston rod chamber 17a, and the hydraulic head chamber 6b is filled. The state in which the cleaning liquid is ejected from the nozzle 16 is shown. The hydraulic head chamber 6a is filled with a new cleaning liquid.

In this state, the switching valve 14 is switched to the left to discharge the compressed air in the piston rod chamber 17a from the silencer 15a, and at the same time, to send the compressed air adjusted by the air pressure adjusting unit 8 to the piston rod chamber 17b. Then, the pneumatic piston 4 is moved to the right. Then, the hydraulic piston 7a moves to the right, and the cleaning liquid filled in the hydraulic head chamber 6a is supplied to the liquid supply pipe at a pressure corresponding to the product of the air pressure adjusting unit 8 and the pressure increase ratio of the pressure intensifier 3. It is pushed to the junction 23 and is ejected from the nozzle 16. At the same time, the hydraulic piston 7b moves to the right, and the cleaning liquid sent from the hydraulic pressure source 1 fills the hydraulic head chamber 6b. Switching valve 1 again
When the valve 4 is switched to the right, the pneumatic piston 4 moves to the left, and the cleaning liquid in the hydraulic head chamber 6b is jetted from the nozzle 16, and at the same time, the hydraulic head chamber 6a is filled with a new cleaning liquid. The moving speed of the pneumatic piston 4 is controlled by the speed control valve 20.
a and 20b.

As described above, regardless of the direction in which the pneumatic piston 4 moves, the cleaning liquid filled in one hydraulic head chamber is jetted, and at the same time, the other hydraulic head chamber is filled with new cleaning liquid. Therefore, the cleaning liquid having a pressure corresponding to the product of the air pressure adjusting unit 8 and the pressure increase ratio of the pressure intensifier 3 can be continuously ejected from the nozzle 16. The injection pressure is measured by the pressure gauge 21.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment has the same configuration as the first embodiment except that an accumulator 13 is connected to the junction of the liquid sending pipes 2 in addition to the first embodiment. Also in the first embodiment, strictly speaking, when the switching valve 14 is switched, a pressure fluctuation may occur in the pipe from the check valves 12a, 12b to the nozzle 16. Since the accumulator 13 reduces the pressure fluctuation, the cleaning liquid having a stable pressure can be ejected from the nozzle 16.

[0015]

As described above, according to the apparatus of the present invention, the cleaning pressure liquid can be continuously jetted without increasing the number of contamination sources, which is useful as a cleaning apparatus.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an apparatus of a first embodiment.

FIG. 2 is a configuration diagram illustrating an apparatus according to a second embodiment.

FIG. 3 is a configuration diagram showing a conventional cleaning pressure liquid injection device.

FIG. 4 is a configuration diagram illustrating another conventional cleaning pressure liquid injection device.

[Explanation of symbols]

1,31 Hydraulic pressure source 2,32 Liquid feed pipe 3,34 Booster 4,38 Pneumatic piston 5a, 5b, 39 Piston rod 6a, 6b, 47 Hydraulic head chamber 7a, 7b, 40 Hydraulic piston 8,46 Pneumatic Adjustment unit 10, 35 Filter 11a, 11b, 12a, 12b, 36, 37 Check valve 13, 48 Accumulator 14, 44 Switching valve 15a, 15b, 45a, 45b Silencer 16, 33 Nozzle 17a, 17b, 42 Piston rod chamber 19, 41 Air pressure source 20a, 20b Speed control valve 23 Confluence point 49 Pressure reducing valve

Claims (2)

[Claims] 1. A liquid pressure source for a cleaning liquid, a liquid supply pipe connected to the liquid pressure source, an injection port provided at the tip of the liquid supply pipe, and a liquid pressure pipe connected to a middle of the liquid supply pipe to reduce the liquid pressure in the pipe. In the cleaning pressure liquid injection device provided with a pressure intensifier that can be increased by the operation of the above, the liquid sending pipe branches off in two directions after leaving the hydraulic pressure source, joins to reach the injection port, and the pressure intensifier is air pressure It is a double-acting type in which a hydraulic piston is connected to both sides of a piston via a piston rod, and one of the branched liquid feed pipes has a head chamber of one hydraulic piston and the other has a head chamber of the other hydraulic feed pipe. The head chambers of the hydraulic pistons are connected to each other. 2. The apparatus according to claim 1, wherein an accumulator is connected to a junction of the branched liquid supply pipes.