JPH07214012A - Washing device - Google Patents

Abstract

PURPOSE:To provide a washing device capable of saving electric power and decreasing noises of a working shop and prolonging the life of parts interposed in a high pressure pipeline of a liquid feed pump by automatically stopping this liquid feed pump when a washing liquid, such as washing water, is not used. CONSTITUTION:This washing device has an air feed pipe 2 capable of supplying pressurized air, a liquid feed pump 3 capable of supplying the washing liquid 29, the liquid feed pump 32 capable of forcibly feeding the washing liquid 29 and an air shut off valve 4 capable of opening and closing the air feed pipe 2. The air feed pipe 2 and liquid feed pipe 3 are provided with a nozzle gun 38 capable of opening and closing these pipes on the downstream side of the pipes. This gun 38 is provided with a changeover switch 41 capable of controlling the on-off actions of the liquid feed pump 32 and the air shut off valve 4. The pressurized air and the washing liquid are selectively injected by means of operation of this changeover switch 41. The device is provided with a means for detecting the injection stop of the washing liquid 29 and the driving of the liquid feed pump 32 is stopped after lapse of the prescribed time from the injection stop of the washing liquid 29 with the detecting operation of this detecting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically stops the liquid supply pump when the cleaning liquid such as cleaning water is not used, thereby saving electric power and reducing noise in the workplace, and at the same time, high pressure pipe of the liquid supply pump. The present invention relates to a cleaning device capable of extending the life of parts inserted in a road.

[0002]

2. Description of the Related Art For example, a recent large-sized car wash machine is equipped with water and air injection nozzles, respectively, and after washing with water or warm water,
It blows air to remove the water adhering to the car body and even allows it to be dried.

However, in a small car washing machine having only one injection nozzle, water or hot water is mainly injected, and air is not blown. In this case, even if air is supplied to the nozzle, there is a problem in that the jet port that jets water at a pressure higher than the air pressure has a small diameter and a small amount of jetted air, resulting in poor drainage effect.

Therefore, the applicant has provided a changeover switch near the nozzle handle, operates the switch to selectively eject water or air, and controls the ON / OFF of the water pump through the switch. However, a cleaning device has been developed which can eliminate the trouble of moving the pump to the installation position of the pump at the time of starting and stopping the pump, which has already been proposed as Japanese Patent Application No. 4-350194.

On the other hand, in Japanese Utility Model Laid-Open No. 59-24183, a transmitter for generating an impact voltage by operating a handle is provided near the nozzle gun, and a lead wire connected to the transmitter is wired in a water hose, and the other end is connected. Is connected to the control circuit of the pump to control ON / OFF of the water pump at the hand of the nozzle gun.

However, in these devices, even if the use of washing water is temporarily stopped, the water pump continues to be driven unless the above switch or transmitter is operated, resulting in increased power consumption and noise in the workplace, and the water pump. There has been a problem that parts such as a relief valve inserted in the high-pressure pipe line have a shortened life due to cavitation or the like.

[0007]

The present invention solves such a problem and automatically stops the liquid supply pump when the cleaning liquid such as cleaning water is not used, thereby saving electric power and reducing noise in the workplace. At the same time, it is an object of the present invention to provide a cleaning device capable of extending the life of components inserted in the high-pressure pipe of the liquid supply pump.

[0008]

For this reason, the cleaning apparatus of the present invention comprises an air supply pipe capable of supplying pressurized air, a liquid supply pipe capable of supplying a cleaning liquid, and a liquid supply pump capable of pumping the cleaning liquid. An air cutoff valve capable of opening and closing the air supply pipe is provided, and a nozzle gun capable of opening and closing the air supply pipe and the liquid supply pipe is provided on the downstream side of the air supply pipe and the liquid supply pipe.
In the cleaning device, the gun is provided with a changeover switch capable of controlling ON / OFF operation of the liquid supply pump and the air cutoff valve, and the pressurized air and the cleaning liquid can be selectively injected through the operation of the switch. Provided with a cleaning liquid injection stop detection means,
Through the operation of the detecting means, the drive of the liquid supply pump is stopped after a predetermined time has elapsed from the stop of the injection of the cleaning liquid, thereby saving electric power, reducing noise in the workplace, and parts inserted in the high-pressure pipe line of the liquid supply pump. The feature is that the life of the can be extended. The cleaning device of the present invention is provided with a liquid supply tank capable of containing and maintaining a fixed amount of cleaning liquid on the downstream side of the liquid supply pipe, and the cleaning liquid in the tank is provided so as to be pumped out by the liquid supply pump.
In addition, a float switch that can detect a predetermined level when the level of the cleaning liquid rises is installed in the liquid supply tank, the drive of the liquid supply pump is stopped through the operation of the switch, and after the injection of the cleaning liquid is stopped, when the liquid level rises. It is characterized in that the driving of the liquid supply pump is stopped at a predetermined time. In the above cleaning device,
After the injection of the cleaning liquid is stopped, a bypass passage is provided on the discharge side of the liquid supply pump, the discharge end of the passage is arranged in the liquid supply tank, and a safety valve that can be opened by the discharge pressure of the liquid supply pump is provided in the bypass passage. The discharge flow of the liquid supply pump is returned to the liquid supply tank through the bypass passage, and the life of the parts inserted in the high-pressure pipe of the liquid supply pump can be extended. The above-mentioned cleaning device is characterized in that cleaning liquid injection stop detection means is provided in the discharge side pipe line of the liquid supply pump or the safety valve so as to diversify the detection means. In the above cleaning apparatus, a delay actuating device is provided in the injection stop detection means to delay the drive stop timing of the liquid supply pump to meet the diversification of use and prevent frequent ON / OFF operation of the liquid supply pump. It is characterized by the fact that it is obtained. The above-mentioned cleaning device is characterized in that the changeover switch has priority over the operation of the float switch and can be changed over to the cleaning liquid or the air injection so that the actual convenience of use by the changeover switch has priority. The above-mentioned cleaning device is characterized in that the changeover switch is of a wireless type and does not require wiring unlike a wired type and has a simple structure. The above-mentioned cleaning device is characterized in that it is possible to switch to cleaning liquid or air injection when the float switch is turned on and off so that the injection mode can be freely selected according to the actual convenience of use. In the above cleaning device, when the float switch detects a predetermined level when the liquid level of the cleaning liquid descends and then when the predetermined level is detected when the liquid level rises, it is possible to set the air injection and reset the air injection mode when the cleaning device is not used. The feature is that the drive of the liquid supply pump is avoided.

[0009]

[Operation] Through the operation of the cleaning liquid jet stop detection means,
The drive of the liquid supply pump is stopped after a lapse of a predetermined time from the stop of the injection of the cleaning liquid to reduce the power consumption and the noise in the workplace. Injection stop detection of the cleaning liquid is provided by a liquid supply tank provided on the downstream side of the liquid supply pipe capable of accommodating and maintaining a fixed amount of the cleaning liquid, and a float switch capable of detecting a predetermined level when the level of the cleaning liquid in the tank rises. Constitutes a means. Stop the drive of the liquid supply pump through the operation of the float switch,
After the injection of the cleaning liquid is stopped, the drive of the liquid supply pump is stopped at a predetermined time when the liquid level rises. After the injection of the cleaning liquid is stopped, a bypass passage is provided on the discharge side of the liquid supply pump, the discharge end of the passage is arranged in the liquid supply tank, and a safety valve that can be opened by the discharge pressure of the liquid supply pump is provided in the bypass passage. , The discharge flow of the liquid supply pump is returned to the liquid supply tank through the bypass passage to prevent the wasting of the cleaning liquid, and avoid the high pressure load on the parts inserted in the high pressure pipe line of the liquid supply pump. To extend the service life. The discharge side pipe line of the liquid supply pump or the safety valve is provided with the cleaning liquid injection stop detection means, and various detection means according to the application and the detection accuracy are obtained. A delay actuating device is provided in the injection stop detection means to delay the drive stop timing of the liquid supply pump to respond to the diversification of use and to turn the liquid supply pump ON / O.
Prevent frequent FF operation. The changeover switch has priority over the operation of the float switch and can be changed over to the cleaning liquid or the air injection, and the actual convenience of use by the changeover switch is given priority. The changeover switch is of a wireless type and does not require wiring as in a wired type, and the configuration is simplified. When the float switch is turned on and off, it is possible to switch to the cleaning liquid or the air injection, so that the injection mode can be freely selected according to the actual usability. When the float switch detects a predetermined level when the level of the cleaning liquid drops and then detects a predetermined level when the liquid level rises, it can be set to air injection and is reset to the air injection mode when the cleaning device is not used. Hold the drive stopped state.

[0010]

EXAMPLES Hereinafter, the present invention will be described with water or hot water as a cleaning liquid.
The illustrated embodiment applied to a car washer for supplying air will be described. In FIGS. 1 to 6, reference numeral 1 denotes a box-shaped car washer main body, in which an air supply pipe 2 communicating with a pressurized air supply system such as an air compressor is provided. And a liquid supply pipe 3 that communicates with a water supply source such as water supply.
An air shutoff valve 4, a water draining device 5, and a gas-liquid switching device 6 are provided in this order.

The air cutoff valve 4 is composed of an electromagnetic valve or the like, and its operation is ON / OFF controlled by a controller described later. The water draining device 5 is a hollow cylindrical airtight water reservoir 7.
A drain piece 9 having an orifice 8 at its bottom, a drain hose 10 is connected to the outer end of the piece 9, and the leak water 11 of the cleaning liquid stored in the water reservoir 7 It can be drained to the outside.

An electrode type liquid level detecting sensor 1 is provided in the water reservoir 7.
2 is provided, and the tips of the pair of electrodes 13 leak water 11
The power source 14 and the controller 15 are connected to the closed circuit of the electrode 13 which is disposed close to the liquid surface of the electrode 13, and a constant voltage is applied between the electrodes 13 and 13 while the signal of the sensor 12 is transmitted. Input to the controller 15 is possible.

An alarm device 16 such as a buzzer and a liquid supply pump described later are inserted in the output side circuit of the controller 15,
Of these, the alarm device 16 can be activated when the sensor 12 is activated, and the liquid supply pump can be stopped when the sensor 12 is activated.

The gas-liquid switching device 6 is composed of a shuttle valve, a selected passage 18 is formed inside the valve body 17, and nipples 19 and 20 are attached to both sides of the passage 18, and an air supply pipe is provided to these. 2 is connected to a liquid delivery pipe described later. Inside the valve body 17, a selection passage 21 communicating with the selected passage 18 is formed, which opens to the side surface of the body 17, and a nipple 22 is attached to the opening, and one end of the conduit 23 is attached to this. Are connected.

A tapered seat surface 24 is formed at the inner end of the one nipple 20 and the selected passage 18 is formed.
A tapered seat surface 25 is formed at one end located on the nipple 19 side of each of the seat surfaces 24, 2
The end face of the shuttle 26 can be engaged with the shuttle 5.

The shuttle 26 is slidably accommodated in the selected passage 18 and has a length longer than the inner diameter of the selection passage 21, and is air-tight and liquid-tight with the seat surfaces 24 and 25 at both ends thereof. A tapered surface that can be engaged with. In the figure, 27 is a small-diameter bypass passage having one end opened to the end of the selected passage 18 on the liquid feed pipe 3 side, and the other end is the selection passage 2
It is open to 1.

On the other hand, a liquid supply tank 28 is provided downstream of the liquid supply pipe 3.
The cleaning liquid 29 can be supplied from the liquid supply pipe 3 to the tank 28, and the float 30 is installed on the liquid surface thereof. The float 30 responds to the liquid level displacement of the cleaning liquid 29 to open and close a known float valve (not shown) provided in the discharge port of the liquid supply pipe 3, and when the valve is opened, the cleaning liquid 29 from the liquid supply pipe 3 is opened. The supply of the cleaning liquid 29 can be interrupted when the valve is closed. in this case,
If the gap between the shuttle 26 and the selection passage 21 is relatively wide, the bypass passage 27 is not necessary.

In the liquid supply tank 28, the gas-liquid switching device 6 is provided.
A liquid supply pipe 31 communicating with the pipe is piped, and a liquid supply pump 32 is inserted in the pipe 31. The operation of the liquid supply pump 32 is controlled by the controller 15 described later, and the pump 32
One end of the bypass passage 33 is connected to the liquid supply pipe 31 on the more downstream side, the discharge port thereof is arranged directly above the liquid supply tank 29, and a safety valve 34 such as a relief valve is inserted in the pipe 31. There is. In this case, the valve opening pressure of the safety valve 34 is set to the same as the discharge pressure of the liquid supply pump 32.

On the inner surface of the liquid supply tank 28, there is provided a float switch 35 which constitutes a jet stop detecting means capable of detecting the liquid level of the cleaning liquid 29, and is turned on / off when a predetermined liquid level is detected. Then, these signals can be input to the controller 15. In this case, if a known delay device is connected to the float switch 35 and the signal input timing from the switch 35 to the controller is delayed by a predetermined time, the drive timing of the liquid supply pump 32 is delayed and various working conditions are met. It is possible to prevent the frequent ON / OFF operation of the pump 32.

The controller 15 has, for example, a microcomputer incorporated therein, and signals of the liquid level detection sensor 12, the float switch 35, and a changeover switch which will be described later can be inputted to the computer, and these signal inputs are conditional. The control signal can be output based on the information stored in advance. That is, the controller 15 has
The injection mode by the ON / OFF signal of the float switch 35, the injection mode by the changeover switch, and their mutual relation are stored, and when the float switch 35 is ON / OFF, both the cleaning liquid and the air are in the injection mode. When the switch 35 is turned on immediately after it is turned off, the air injection mode can be set and its reset state can be set.

When the cleaning liquid injection mode is set,
When the air cutoff valve 4 is closed and the control signal for driving the liquid supply pump 32 is output, the air cutoff valve 4 is set when the air injection mode is set.
Is opened, and a control signal for stopping the driving of the liquid supply pump 32 can be output. On the other hand, independently of the setting of these injection modes, a control signal for stopping the drive of the liquid supply pump 32 can be output when the float switch 35 is ON, and an alarm device is provided when a signal is input from the liquid level detection sensor 12. An alarm signal can be output to 16.

Further, the controller 15 can process the signal of the changeover switch prior to the signal of the float switch 35, drive or stop the liquid supply pump 32 when the signal is input, and cancel the current injection mode. The next cleaning liquid or air injection mode can be set to be switched, and a predetermined control signal can be output to the air shutoff valve 4 and the liquid supply pump 32 in accordance with the switching mode. In the figure, reference numeral 36 denotes a receiving antenna projecting above the front end of the car wash machine body 1 and connected to the receiving circuit and its amplifying circuit.

A flexible and long guide tube 37 such as a rubber hose is connected to the tip of the conduit 23, and a nozzle gun 38 is attached to the tip thereof. The nozzle gun 38 is provided with a trigger 39 for performing gas-liquid injection, and the guide tube 37 and a metal nozzle pipe 40 connected to the nozzle gun 38 can communicate with each other through the operation of the trigger 39.

At an appropriate position of the nozzle gun 38, that is, in the upper portion in the embodiment, the wireless changeover switch 4 which is a remote control switch
1 is detachably attached, and the switch 41 is used when the operation button (not shown) is turned on and off.
The ON / OFF signal of and the switching signal of the gas-liquid injection mode can be emitted. In this case, if the changeover switch 41 is removed from the nozzle gun 38 and the operator carries it, it is possible to prevent damage in use or storage when the changeover switch 41 is attached to the nozzle gun 38.

The switching signal is composed of a signal system in which the liquid jet mode and the air jet mode are alternately repeated. This signal is emitted toward the receiving antenna 36, and the controller 15
Input to. Timing diagram in this case 4
, And these are stored in the controller 15.

A nozzle 42 is connected to the tip of the nozzle pipe 40, and the nozzle 42 has two passages 43 and 44 communicating with the nozzle pipe 40 therein, as shown in FIGS. Rotary valve 45 consisting of three-way valve
Is rotatably attached. The rotary valve 45 is formed in a substantially cylindrical shape, and an operation knob 45a is projectingly provided at an axial end portion thereof in a direction orthogonal to the axial direction, and three ports P1, P2, P3 which are electrically connected to each other are formed in the inside thereof. One of the ports can be selectively communicated with one of the passages 43 and 44, and the conduction areas of the ports P1 to P3 can be adjusted appropriately.

At one end of the nozzle 42, an injection port 46 for air injection communicating with the passage 43 is opened, and a nozzle joint 47 is screwed into the opening of the passage 44, and the outer end surface of the joint 47 is connected to the passage 44. An injection port 48 for communicating, which has a diameter smaller than that of the injection port 46, is formed for ejecting the liquid. In addition, reference numeral 49 in the drawing denotes traveling wheels provided on the car wash machine body 1.

Since the cleaning device thus constructed uses the wireless type changeover switch 41, the wiring work is unnecessary, and the structure is simpler than that of the conventional one. Next, in the cleaning device, a predetermined amount of cleaning liquid 29 is normally stored in the liquid supply tank 28, the liquid surface thereof maintains the reference surface, the float switch 35 is placed in the ON state, and the air injection mode is reset. Has been done. Therefore, in this case, the air shutoff valve 4 is opened and the liquid supply pump 32 is stopped.

Under such a circumstance, when spraying the cleaning liquid from the nozzle 42 using the cleaning device, the nozzle gun 38 is held and the changeover switch 41 is turned on. By doing so, the signal emitted from the switch 41 is received by the receiving antenna 36, and is input from the receiving device to the controller 15 via the amplifier.

Based on the stored information, the controller 15 switches the injection mode of the cleaning device to the liquid supply injection mode based on the stored information, and outputs the control signal to the air cutoff valve 4 and the liquid supply pump 32. Therefore, the air shutoff valve 4 is closed,
The air supply passage downstream of the valve 4 is shut off, and the liquid supply pump 32 is driven to drive the cleaning liquid 2 in the liquid supply tank 29.
9 is sucked, pressurized to about 100 kg / cm @ 2, sent out to the delivery pipe 31 on the downstream side, and sent to the gas-liquid switching device 6.

In this case, a part of the pressurized cleaning liquid is guided to the bypass passage 33 and reaches the safety valve 34, but the tip of the delivery pipe 31 is opened by the injection of the cleaning liquid by the nozzle 42, and the pipe is opened. Since the pressure of the return pipe 33 communicating with 31 also becomes the same pressure state and becomes less than or equal to the opening pressure of the safety valve 34, the safety valve 34 maintains the closed state.

The pressurized liquid supply 29 is guided to the delivery pipe 31,
It flows into the selected passage 18 of the gas-liquid switching device 6 from the nipple 20 and pushes the shuttle 26 by its pressure to press it against the seat surface 25 to close the communication port on the air supply pipe 2 side.

Therefore, the pressurized liquid supply 29 bends at a right angle from the selected passage 18 and moves to the selection passage 21, is sent out from the passage 21 through the nipple 22 to the conduit 23, and from the conduit 23 to the guide pipe 37. After that, it is guided to the nozzle gun 38. Thereafter, when the trigger 39 of the nozzle gun 38 is operated, the guide pipe 37 communicates with the nozzle pipe 40, and the pressurized liquid supply 29 is guided to the nozzle 42.

In preparation for the liquid supply injection mode, the nozzle 42 rotates the operation knob 45a in advance to rotate the rotary valve 45 so that the port P2 is brought into communication with the passage 44 and the injection port 48.
Is communicated with the nozzle pipe 40 as shown in FIG. 6, and one of the injection ports 46 is cut off and placed. By doing so, the pressurized liquid supply 29 is jetted from the jet port 48, and if this is jetted toward the washing portion of the vehicle, car washing becomes possible. in this case,
When the injection amount and the injection pressure of the cleaning liquid are excessive, the adjusting knob 45a is appropriately rotated to move the port P2 to the passage 44.
A desired injection amount and injection pressure can be obtained by adjusting the conduction area of. The same applies to the air injection described below.

At the time of jetting such a cleaning liquid, for example, the shuttle 26 and the seat surface 25 may not be completely sealed,
When foreign matter such as dust is caught between them, water is leaked from the seal portion, a part of the cleaning liquid 29 enters the air supply pipe 2, and the water reservoir of the water draining device 5 connected to the pipe 2 Bowl 7
Flows in.

The above-mentioned cleaning liquid leaks water 1 to the bottom of the water reservoir 7.
When the water level rises and the pressure in the water reservoir 7 rises, it is pushed out from the orifice 8, is guided to the drain pipe 10, and is drained to the outside of the car wash main body 1. Therefore, the leaked water 11 does not overflow from the water reservoir 7, and the overflow does not enter the upstream side of the air supply pipe 2.

On the other hand, if, for example, a very large dust is caught between the shuttle 26 and the seat surface 25 and the seal of the portion is significantly deteriorated, a large amount of cleaning liquid leaks from the gas-liquid switching device 6. , Which flows into the water reservoir 7. As described above, a part of the leaked water 11 is discharged from the orifice 8. However, when the inflow amount exceeds the drainage amount, the water level rises above the allowable level, and finally the electrode 13 of the liquid level detection sensor 22. , 13 tip end is immersed.

However, since a predetermined voltage is applied between the electrodes 13 and 13, when it is immersed in the leakage 11, the electrodes 13 and 13 are short-circuited and a weak current flows between them, resulting in a signal thereof. Is input to the controller 15. The controller 15 amplifies the above signal and outputs the control signal to the liquid feed pump 32 and the alarm device 16 to stop the drive of the liquid feed pump 32 and activate the alarm device 16. Therefore, the inflow of the cleaning liquid into the water reservoir 7 is stopped, and the surrounding workers are notified of the above situation,
First-aid measures can be taken.

Even under such a situation, the leaked water 11 in the water reservoir 7 is continuously drained from the drain pipe 10, and finally all of it is drained. Therefore, the leaked water 1
1 does not overflow from the water reservoir 7, and the overflow does not enter the upstream side of the air supply pipe 2, and even if it does enter, the air shutoff valve 4 is closed, so the entry is blocked. However, the upstream air system such as the air pump is not damaged or disabled.

As described above, according to the present invention, the backflow of the cleaning liquid to the air system is prevented in a double and triple manner, and the safety of the air system is ensured.

Thus, the car washing work is started and the nozzle 4
When the cleaning liquid 29 is sprayed from 2, the cleaning liquid 29 in the liquid supply tank 28 is consumed, and the liquid level thereof is lowered. When the liquid level drops to a predetermined level, the float switch 35 is turned off, the signal is input to the controller 15, and a float valve (not shown) is also passed through the float 30 that is driven by the liquid level change. Is opened, the liquid supply is supplied from the liquid supply pipe 3, the liquid level rises, and the liquid level stops when the supply and demand balance of the cleaning liquid is balanced.

In such a car wash operation, the trigger 39 is operated when the injection operation of the cleaning liquid is completed or when the injection is temporarily interrupted. In this way, the electrical connection between the nozzle pipe 40 and the guide pipe 37 is cut off, and the nozzle 4
The injection of the cleaning liquid from 2 is stopped.

Therefore, the cleaning liquid 2 in the liquid supply tank 28
The supply / demand balance of 9 is upset, the liquid level of the cleaning liquid 29 rises, and when it reaches a predetermined level, the float switch 35 is turned on, that is, an ON signal that is reached for the first time after turning off is input to the controller 15. The controller 15 sends a control signal to the liquid supply pump 3 based on the input signal.
2 and the air cutoff valve 4 to stop driving the liquid supply pump 32 and open the air cutoff valve 4 to switch the cleaning device to the air injection mode.

Therefore, after the injection of the cleaning liquid 29 is stopped, the liquid supply pump 32 automatically stops its driving, so that the power consumption can be saved and the noise due to the driving noise can be prevented. In this case, the time required from the injection stop to the drive stop of the liquid supply pump 32 is determined by the liquid level rising speed of the cleaning liquid 29 in the liquid supply tank 28. However, depending on the length of the time, in terms of work and mechanism. May cause inconvenience. For example, when moving to another cleaning location using the above time, if the above time is short, the liquid supply pump 32 stops driving, and the cleaning liquid can be used immediately even if the nozzle gun 38 is operated. Disappear.

Therefore, in this case, the float switch 3
If a desired delay device (not shown) is connected to 5 and the signal input timing of the switch 35 to the controller 15 is delayed by a predetermined time, the above-mentioned inconvenience is eliminated and the liquid supply pump 3
Frequent ON / OFF operation of 2 can be prevented.

On the other hand, after the injection of the cleaning liquid is stopped, the liquid supply pump 3
While the pump 2 is not driven, the pump 32 keeps the cleaning liquid 29
Is pressurized and is discharged to the delivery pipe 31 on the downstream side.
The discharged cleaning liquid is pressurized to a pressure substantially equal to the valve opening pressure of the safety valve 34, which cuts off the path to the conduit 23 and moves to the bypass passage 33 side, and the safety valve 3 inserted in the passage 33 is inserted.
The valve 4 is opened to move to the discharge port side, and falls into the liquid supply tank 28 through the discharge port and is accommodated therein.

Therefore, it is possible to prevent the cleaning liquid from being wasted, and the pressure in the circulation pipe line is prevented from rising due to the opening of the safety valve 34. Therefore, the safety valve 34 and the liquid feed pump 32 inserted in the pipe line are prevented. It is possible to avoid the high pressure load and cavitation, and extend their life.

Next, when the water adhering to the vehicle body is removed after the car is washed, the changeover switch 41 is operated to switch to the air injection mode. That is, when the switching signal of the changeover switch 41 is received by the receiving antenna 36 and is input to the controller 15 via the receiving circuit and the amplifying circuit, the controller 15 corresponds to the air injection mode and the air cutoff valve 4 and the liquid supply. A control signal is output to the pump 32, the air cutoff valve 4 is opened, and the driving of the liquid supply pump 32 is stopped.

Therefore, compressed air, in the embodiment, about 8 kg / cm 2 of air is supplied to the air supply pipe 2, and this is supplied to the water reservoir 7.
The cleaning liquid adhering to the inside of the container 7 is washed away, and the cleaning liquid flows into the gas-liquid switching device 6 on the downstream side of the cleaning liquid.
Is pushed toward the nipple 20 side.

At this time, if the nipple 20 is placed in the lower position and the gas-liquid switching device 6 is installed, the cleaning liquid remains in the lower half of the selected passage 18, and this residual liquid is the shuttle 2.
It is pushed away by 6 and tries to move to the selection passage 21.
However, since the gap between the shuttle 26 and the selection passage 21 is narrow, the residual water is guided to the bypass passage 27 and moves to the selection passage 21, and the shuttle 26 is pressed against the seat surface 24 to seal the portion.

Therefore, the air is then supplied to the selected passage 1
8 to the selection passage 21, and from the nipple 22 to the conduit 2
3 is moved to the guide tube 23 and guided to the nozzle 38.

In order to prepare for the air injection mode, the nozzle 42 is rotated in advance by operating the operation knob 45a to rotate the rotary valve 45.
6 by turning 90 ° clockwise in FIG. 6 to set ports P2 and P3.
Is connected to the passage 43, the injection port 46 is communicated with the nozzle pipe 40, and one injection port 48 is placed so as to be blocked from the pipe 40. By doing this, after this, the trigger 39
When the guide pipe 37 and the nozzle pipe 40 are communicated with each other, pressurized air is jetted from the jet port 46, and by jetting this toward the washing portion of the vehicle, draining work becomes possible.

In this embodiment, the cleaning liquid 2 in the liquid supply tank 28 is used as a means for detecting the use stop state of the cleaning liquid.
The float switch 35 is used to detect the liquid level of No. 9, but in addition to this, the liquid pressure acting on the conduit 23 or the safety valve 34, that is, the pressure corresponding to the discharge pressure of the liquid supply pump 32 is detected, and the signal thereof is controlled by the controller. You may make it input into 15.

[0054]

As described above, the cleaning apparatus of the present invention is provided with the cleaning liquid injection stop detecting means, and the drive of the liquid supply pump is stopped after a lapse of a predetermined time after the cleaning liquid injection is stopped through the detection operation of the cleaning means. As a result, it is possible to reduce power consumption and noise in the workplace by driving the pump, and to control the operation of the liquid supply pump in accordance with the actual conditions of normal use to prevent its frequent ON / OFF operation. You can The cleaning device of the present invention comprises a liquid supply tank provided on the downstream side of a liquid supply pipe capable of containing and maintaining a fixed amount of cleaning liquid, and a float switch capable of detecting a predetermined level when the liquid level of the cleaning liquid in the tank rises. Since the injection stop detection means for the cleaning liquid is configured, inexpensive and reliable and stable operation can be obtained.
The cleaning device can stop the drive of the liquid supply pump through the operation of the float switch, and after the injection of the cleaning liquid is stopped, the drive of the liquid supply pump can be stopped at a predetermined time when the liquid level rises. The cleaning apparatus of the present invention is provided with a bypass passage on the discharge side of the liquid supply pump, and arranges the discharge end of the passage in the liquid supply tank.
A safety valve that can be opened by the discharge pressure of the liquid supply pump is provided in the bypass passage, and after the injection of the cleaning liquid is stopped, the discharge flow of the liquid supply pump is returned to the liquid supply tank through the bypass passage, thereby reducing the waste of the cleaning liquid. In addition to the prevention, it is possible to avoid the high pressure load on the components inserted in the high pressure pipe of the liquid supply pump and to extend the life of them. According to the present invention, since the cleaning liquid injection stop detecting means is provided in the discharge side conduit of the liquid supply pump or the safety valve, various detecting means can be provided according to the use and the detection accuracy. According to the present invention, the injection stop detection means is provided with the delay actuating device to delay the drive stop timing of the liquid supply pump. Therefore, it is possible to respond to the diversification of use such as working conditions and the frequent ON / OFF operation of the liquid supply pump. Can be prevented. According to the present invention, the changeover switch has priority over the operation of the float switch and can be changed over to the cleaning liquid or the air injection, so that the actual convenience of use by the changeover switch can be given priority. In this case, since the changeover switch is of a wireless type, wiring unlike a wired type is not required, and the configuration can be simplified. Since the cleaning device can switch to the cleaning liquid or the air injection when the float switch is turned on and off, the injection mode can be freely selected according to the actual convenience of use. According to the present invention, after the float switch detects the predetermined level when the liquid level of the cleaning liquid is descending, and when the predetermined level is detected when the liquid level rises, the air injection can be set, so that the air injection mode is reset when the cleaning device is not used. It is possible to keep the drive stop state of the liquid supply pump.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example in which the present invention is applied to a car wash machine.

FIG. 2 is a cross-sectional view showing an example of a water draining device applied to the present invention.

FIG. 3 is a sectional view showing an example of a gas-liquid switching device applied to the present invention.

FIG. 4 is a timing chart showing a relationship among a changeover switch, a float switch and an injection mode applied to the present invention.

FIG. 5 is a front view showing an example of a nozzle applied to the present invention.

6 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 Air supply pipe 3 Liquid supply pipe 4 Air shutoff valve 29 Cleaning liquid 32 Liquid supply pump 33 Bypass pipe 34 Safety valve 35 Float switch 41 Changeover switch

Claims (9)

[Claims] 1. An air supply pipe capable of supplying pressurized air, a liquid supply pipe capable of supplying a cleaning liquid, a liquid supply pump capable of pumping the cleaning liquid, and an air cutoff valve capable of opening and closing the air supply pipe, A nozzle gun that can open and close the air supply pipe and the liquid supply pipe is provided on the downstream side, and the liquid supply pump and the air cutoff valve are turned on and off in the gun.
In a cleaning device provided with a changeover switch capable of controlling the operation and capable of selectively injecting the pressurized air and the cleaning liquid through the operation of the switch, a cleaning liquid injection stop detection means is provided, and the detection means detects. A cleaning device characterized in that the drive of the liquid supply pump is stopped after a predetermined time has elapsed from the stop of the injection of the cleaning liquid through the operation. 2. A liquid supply tank capable of accommodating and maintaining a fixed amount of cleaning liquid is provided on the downstream side of the liquid supply pipe, the cleaning liquid in the tank can be pumped out by the liquid supply pump, and the cleaning liquid can be stored in the liquid supply tank. 2. The cleaning device according to claim 1, further comprising a float switch capable of detecting a predetermined level when the surface is raised, and driving the liquid supply pump is stopped through the operation of the switch. 3. A bypass passage is provided on the discharge side of the liquid supply pump, a discharge end of the passage is arranged in a liquid supply tank, and a safety valve that can be opened by the discharge pressure of the liquid supply pump is provided in the bypass passage. Item 2. The cleaning device according to item 2. 4. The cleaning device according to claim 1, wherein the discharge side pipe of the liquid supply pump or the safety valve is provided with a cleaning liquid injection stop detection means. 5. The injection stop detection means is provided with a delay actuating device to delay the drive stop timing of the liquid supply pump.
The cleaning device according to 2,4. 6. The cleaning apparatus according to claim 1, wherein the changeover switch can be switched to a cleaning liquid or an air jet in preference to the operation of the float switch. 7. The cleaning device according to claim 1, wherein the changeover switch is of a wireless type. 8. The cleaning apparatus according to claim 2, wherein the cleaning liquid or air injection can be switched when the float switch is turned on and off. 9. The cleaning device according to claim 2, wherein the float switch can be set to inject air when a predetermined level is detected when the liquid level of the cleaning liquid is lowered and then a predetermined level is detected when the liquid level is increased.