JP2002161864A - Liquid spraying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid spraying device capable of automatically controlling the discharge of extra liquid and an internal combustion engine for driving to a low speed side to prevent the occurrence of noises and waste fuel consumption, improving the durability of the internal combustion engine for driving and a pump, and reducing costs and having a simple structure when liquid spraying work is interrupted. SOLUTION: This liquid spraying device consists of a pressure leakage adjusting valve 8 having a liquid inlet 9 communicated with a discharge port 6 of the pump 1, a liquid outlet 11 communicated with an spray nozzle 10, and an unloader valve displaced when a water pressure inside it exceeds a predetermined pressure to open an extra liquid port 12, an operation pin 24 protruded to the outside of the pressure leakage adjusting valve 8 from the unloader valve of the pressure leakage adjusting valve 8 and displaced integrally with the unloader valve, and a controller for controlling the internal combustion engine 50 for driving the pump 1 to a low speed side control position in the interlocking relationship with the displacement of the operation pin 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a high-pressure washing machine for injecting high-pressure water to wash various mechanical devices,
The present invention relates to a liquid ejecting apparatus that can be used as a pesticide sprayer for spraying a pesticide liquid or the like.

[0002]

2. Description of the Related Art In a liquid injection apparatus as described above, when the injection nozzle is closed to interrupt the liquid injection operation, if the internal combustion engine that drives the pump is still driven at a high speed, noise continues to be generated. Consumes wasted fuel,
Further, the durability of the internal combustion engine, the pump, and the like is impaired.

[0003] As an apparatus for eliminating the above-mentioned conventional inconveniences, the applicant has applied an internal combustion engine, which is a pump driving source, by discharging water and simultaneously changing the water pressure during a liquid injection operation with the movement of a differential pressure cylinder. A pump device that controls at a low speed (see Japanese Utility Model Registration No. 2598553). At the same time as the discharge of surplus water, a change in water pressure when the liquid injection work is interrupted is detected by a switch, and the electric motor that is the driving source of the pump is stopped. An electric liquid ejecting apparatus (see Japanese Utility Model Publication No. 7-21238) has been proposed.

[0004]

The use of the differential pressure cylinder requires the preparation of the differential pressure cylinder and the piping for it.
There remains a problem that the production is time-consuming, such as complicated equipment and measures for preventing liquid leakage. In addition, the above-mentioned electric liquid ejecting apparatus has a problem that a control circuit is complicated, such as preparation of an electromagnetic contactor, a coil portion, and various contacts, and further, preparation of a power supply.

An object of the present invention is to provide a liquid ejecting apparatus which is easy to adjust and maintain, has a simple structure and reduces costs in view of the above circumstances.

[0006]

According to a first aspect of the present invention, there is provided a liquid ejecting apparatus, comprising: a liquid inlet communicating with a discharge port of a pump; a liquid outlet communicating with a jet nozzle; A leak pressure regulating valve having an unloader valve that is displaced when the fluid pressure of the fluid becomes equal to or higher than a predetermined pressure to open a surplus fluid port, and protrudes from the unloader valve of the leak pressure regulating valve to the outside of the leak pressure regulating valve. An operating pin that is caused to be displaced integrally with the unloader valve, and a control device that sets the internal combustion engine that drives the pump in response to the displacement of the operating pin to a low-speed control position.

According to the first aspect of the present invention, the operating pin, which is displaced integrally with the unloader valve, is made to protrude outside the leak pressure regulating valve, and protrudes outside the leak pressure regulating valve. The driving internal combustion engine of the pump can be controlled at a low speed by directly utilizing the displacement of the operating pin, and its manufacture is easy.

Further, one end of the control device is formed integrally with the leak pressure control valve, thereby simplifying the structure. In addition, the control device is provided outside the leak pressure control valve. Adjustment and maintenance of the control device in accordance with the pressure adjustment and the leak pressure adjustment are also easy.

According to one embodiment of the present invention,
The control device according to claim 1 includes an operation pin that is displaced integrally with the unloader valve, and an engine governor lever that swings in conjunction with the displacement of the operation pin.

According to the embodiment of the present invention, the displacement of the operating pin only needs to be linked with the swing of the engine governor lever via the mechanical linking means, and many devices are required. do not do. That is, for example, the displacement width of the operating pin is enlarged using a swing lever or the like pivotally supported at one end, and the enlarged displacement width is used for swinging the engine governor lever via a wire or the like. I just need.

One embodiment of the present invention described in claim 3 is:
The engine governor lever according to claim 2,
A return spring for returning the engine governor lever to the high-speed control position of the drive engine is connected.

According to the third aspect, the engine governor lever is always made to follow the displacement of the unloader valve of the leak pressure adjusting valve, and when the internal hydraulic pressure returns to the predetermined pressure, When the liquid injection operation is restarted after the injection operation is stopped, the drive engine governor lever is automatically returned to the high-speed control position, so that it is not necessary to control the drive internal combustion engine again.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially omitted front view of a main part of a liquid ejecting apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an example of a leak pressure adjusting valve in FIG. 1, and FIG. 1 is a schematic system diagram of a liquid ejecting apparatus according to an embodiment of the present invention.

First, FIG. 3 will be described. In the figure, 1
Is a high-pressure plunger pump, which is driven by a driving internal combustion engine 50 through a belt B and a pulley 2 to discharge a cleaning liquid M such as water in a tank 3 from a suction port 5 through a suction conduit 4. The cleaning liquid M is sucked in and discharged from the discharge port 6 while being pressurized. The outlet 6 is connected via a conduit 7
It communicates with the inlet 9 of the leak pressure regulating valve 8.

Further, as shown in FIG. 2, the leak pressure regulating valve 8 is displaced when the liquid pressure inside the liquid outlet 11 and the conduit 14 communicating with the injection nozzle 10 becomes higher than a predetermined pressure. And an unloader valve 13 for opening the excess liquid port 12. In the figure, 12a is a conduit for returning the excess liquid from the excess liquid port 12 to the tank 3, and C is a check valve assembly provided in the liquid outlet 11.

In one embodiment of the drawings, the injection nozzle 1
Numeral 0 is a spray gun 15 type and has a trigger type on-off valve 16. The unloader valve 13 is
A poppet valve 18, a poppet valve seat 19, a push rod 20, a pressure-adjusting spring receiver 21, a pressure-adjusting coil spring 22 disposed in a casing 17 constituting the leak pressure adjusting valve 8, and screwed to the casing 17. The pressure adjusting spring cover 23 is provided.

In the embodiment of the present invention, the leakage pressure regulating valve 8
The unloader valve 13 is provided with an operating pin 24 protruding from the unloader valve 13 to the outside of the leak pressure adjusting valve 8 and displaced integrally with the unloader valve 13.

In one embodiment of the drawings, the operating pin 24
Is a part of the unloader valve 13, the pressure adjusting spring receiver 21 which is displaced integrally with the unloader valve 13,
One end 24a is fitted and fixed, and the other end 24b is projected outside the leak pressure regulating valve 8. In the figure, 8
“a” is a long hole that allows displacement of the operating pin 24 formed in the casing 17 of the leak pressure adjusting valve 8.

Next, a description will be given of a control device 25 for moving the driving internal combustion engine 50 of the pump 1 to the low-speed side control position L in conjunction with the displacement of the operation pin 24. One preferred embodiment of the control device 25 of the present invention includes the operating pin 24 which is integrally displaced with the unloader valve 13, an engine governor lever 26 which is swung in conjunction with the displacement of the operating pin 24, Composed of

A specific example of the control device 25 is shown in FIG. First, a control plate 27 is attached and fixed to the casing 17 of the leak pressure regulating valve 8 by appropriate means. In the embodiment shown in the drawings, a bracket 29 fixed to the back surface of the control plate 27 is fixed to a bracket 28 previously fixed to the leak pressure regulating valve 8 by a bolt 30.

Next, the control plate 27 is formed with an elongated hole 31 which is protruded out of the leak pressure regulating valve 8 and in which the operating pin 24 which is displaced integrally with the unloader valve 13 fits. Like the long hole 8 a of the casing 17, the long hole 31 is formed to have a length equal to or slightly larger than the displacement width of the unloader valve 13, that is, the operation pin 24.

A swing lever 33 pivotally supported by a shaft 32 at a rear end 33a of the control plate 27 so as to be adjacent to and intersect with the long hole 31 formed in the control plate 27.
Is provided.

That is, the shaft 3 of the swing lever 33
An appropriate position closer to the second side is located in the long hole 31 portion. More specifically, the operating pin 24 protruding from the long hole 31 is slightly attached to the shaft 32 of the swing lever 33.
The side is abutted.

Further, the tip 33b of the swing lever 33
The rear end 36a of the inner wire 36 of the Bowden cable 35 is connected to the connecting tool 3 via a damper spring 34.
7 and the end 3 of the inner wire 36.
6b is connected to the front end 26a side of the engine governor lever 26 pivotally supported on the internal combustion engine 50 by the shaft 38 at the rear end 26b side. In the figure, reference numeral 39 denotes a return spring for returning the engine governor lever 26 to the high-speed control position H of the internal combustion engine 50; 40, a swing width adjusting stopper of the swing lever 33; A bracket for fixing a Bowden cable to the main body of the engine 50.

If necessary, the internal combustion engine 5
0, the high pressure plunger pump 1, the leak pressure regulating valve 8,
The tank 3 and other accessories are integrated, mounted on a traveling vehicle, and configured to be movable.

According to the embodiment of the present invention, at the time of the liquid injection operation, the plunger pump 1 is driven by the internal combustion engine 50, and thereafter, the trigger type on-off valve 16 of the spray gun 15 is operated. As a result, the cleaning liquid M such as water in the tank 3 is sucked into the suction port 5 of the plunger pump 1 via the suction conduit 4, and the pressurized cleaning liquid L is supplied to the plunger. The discharge port 6 of the pump 1, the conduit 7, the liquid inlet 9 of the leak pressure regulating valve 8, the check valve assembly C of the leak pressure regulating valve 8, the liquid outlet 11 of the leak pressure regulating valve 8, Via the conduit 14 and the spray gun 15,
The liquid is ejected from the ejection nozzle 10 to the outside.

Next, in order to temporarily suspend the liquid jetting operation, the trigger type on-off valve 16 of the spray gun 15 is used.
Is closed, the hydraulic pressure in the leak pressure regulating valve 8 is rapidly increased, and the unloader valve 13 in the leak pressure regulating valve 8 is increased.
However, the pressure adjusting spring 22 is compressed and displaced to open the surplus liquid port 12, and the surplus liquid is returned to the tank 3 via the conduit 12a.

Simultaneously with the displacement of the unloader valve 13, the pressure adjusting spring receiver 21 constituting the unloader valve 13
The operating pin 24 having one end 24a fitted and fixed at the same time is simultaneously displaced.

Further, when the operating pin 24 is displaced, the tip 33b of the swing lever 33 is swung about the shaft 32 at the rear end 33a, and the inner end 33b connected to the tip 33b is rotated. The rear end 36a of the wire 36 is pulled.

Further, the engine governor lever 26 connected to the distal end 36b of the inner wire 36
Is pulled to the low-speed side control position L, and the rotation of the driving internal combustion engine 50 is controlled at a low speed.

Thereafter, when the trigger type on-off valve 16 of the spray gun 15 is opened to resume the liquid injection operation, the hydraulic pressure in the leak pressure regulating valve 8 decreases, and the pressure adjusting spring 22 is extended. The unloader valve 1
3 is returned, the spill port 12 is closed, and the operating pin 24 is returned to the original position. At the same time, the operation of the return governor 39 causes the engine governor lever 26 to move the internal combustion engine for driving. 50
At the high-speed side control position H, and at the same time, the swing lever 33 is also returned to the original position via the inner wire 36, so that the liquid ejection operation at the predetermined ejection pressure is continued.

The damper spring 34 in the embodiment of the present invention can be omitted by providing an engaging hole in the swing lever 33 and directly engaging the operating pin 24. .

[0033]

According to the present invention, when the liquid injection operation is interrupted, the discharge of the residual liquid and the driving of the internal combustion engine for driving are automatically controlled to a low speed side, thereby generating noise and wasting fuel consumption. It does not impair the durability of the driving internal combustion engine or pump. Further, effects such as simple structure, cost reduction and easy adjustment and maintenance can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view of a main part of a liquid ejecting apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a leak pressure adjusting valve in FIG.

FIG. 3 is a schematic system diagram of a liquid ejecting apparatus according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 6 Discharge port 8 Leak pressure regulating valve 9 Liquid inlet 10 Injection nozzle 11 Liquid outlet 12 Surplus liquid port 13 Unloader valve 24 Operating pin 25 Control device 26 Engine governor lever 39 Return spring 50 Internal combustion engine for driving L Low speed side control position H High speed control position

Continued on the front page (72) Inventor Kazuhisa Mori 1-7-2, Suehirocho, Ome-shi, Tokyo F-term (reference) 3K045 AA10 AA12 AA22 BA32 BA34 BA38 CA03 DA09 DA19 EA43 EA46

Claims (3)

[Claims] 1. A liquid inlet (9) communicating with a discharge port (6) of a pump (1), a liquid outlet (11) communicating with an injection nozzle (10), and an internal liquid pressure is equal to or higher than a predetermined pressure. A leak pressure regulating valve (8) having an unloader valve (13) that is displaced when the valve is displaced to open the surplus liquid port (12); The unloader valve (1) is protruded outside the pressure regulating valve (8).
An operation pin (24) displaced integrally with the operation pin (3) and an internal combustion engine (50) for driving the pump (1) in conjunction with the displacement of the operation pin (24) are set to a low-speed control position (L). And a control device (25). 2. The control device according to claim 1, wherein the control unit is configured to control the unloader valve (1).
3. The system according to claim 1, further comprising: the operating pin (24) integrally displaced with the operating pin (3); and an engine governor lever (26) pivoted in conjunction with the displacement of the operating pin (24). The liquid ejecting apparatus according to claim 1. 3. The engine governor lever (26).
The liquid injection device according to claim 2, further comprising a return spring (39) for returning the engine governor lever (26) to the high-speed side control position (H) of the internal combustion engine (50).