JPH0326957Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The invention consists of disposing a boiler and a pump that operate independently within the machine frame, and controlling the combustion device of the boiler via a temperature controller. , hot water or cold water is injected from a washing gun connected to the pump, and hot water at the desired temperature can be immediately discharged during use, and the hot water washing and cold water washing can be independently performed depending on the location to be washed and the dirt status of the vehicle. The present invention relates to a cleaning device that performs other types of cleaning.

"Prior Art" Conventionally, such a cleaning device is described in, for example, Japanese Utility Model Publication No. 15096/1983. As shown in FIG. 5, this car washing device includes a boiler 2 having a large-capacity hot water storage chamber 3 connected to a water source (water supply) through a water supply pipe 8 in a machine frame 1, and a hot water storage chamber 3 of the boiler.
Hot water pipe 1 to a hot water tank (not shown) connected to
A burner switch 27 and a pump switch 24, which are operation switches for the boiler 2 and the pump 14, are separated from the power supply so that the boiler 2 and the pump 14 can be operated independently. A temperature regulator 26 is provided, and is activated by a detection signal from a temperature sensor 25 provided in the hot water storage chamber 3 of the boiler 2.
The combustion device 6 of the boiler 2 is controlled via the cleaning gun 17 connected to the pump 14 to provide a predetermined high temperature,
A large amount of high-pressure hot water or high-pressure cold water is continuously sprayed to wash vehicles and other objects.

Therefore, in this washing device, the burner switch 27 is operated in advance to operate the boiler 2 independently, and hot water at a predetermined temperature set by the temperature regulator 26 is stored in the hot water storage chamber 3 in the boiler 2. In particular, hot water at a predetermined temperature can be immediately discharged during use.

Since the suction pipe of the pump 14 is connected only to the hot water pipe 11 leading out from the hot water tank connected to the hot water storage chamber 3 of the boiler, hot water washing and cold water washing can be performed depending on the location to be washed and the state of dirt. In order to perform washing independently, that is, to switch between hot water and cold water discharge from the pump 14, this was done by turning the burner switch 27 on and off. In other words, in the case of hot water washing, the burner switch 27 is turned on to operate the boiler combustion device 6, and in the case of cold water washing, the burner switch 27 is turned off and the operation of the boiler combustion device 6 is stopped. Ta.

``Problem that the invention seeks to solve'' Generally, when cleaning an object to be cleaned, there are cases where high-temperature hot water washing is required depending on the location to be washed and the dirtiness, and there are cases where high-temperature hot water washing is not necessary. There are cases where the purpose of washing can be fully achieved even with cold water washing, and cases where high temperature hot water washing is not suitable. For example, when washing a vehicle, hot water washing at a high temperature (approximately 100 degrees Celsius) is essential for cleaning grease and oil stains from the undercarriage, engine room, etc. For cleaning dirt, high temperatures are not required, and cold water cleaning at a predetermined pressure is sufficient.

Therefore, especially in maintenance shops, car washes, etc. where hot water washing and cold water washing are used very frequently, it is necessary to use the
It is desired that the discharge of hot water or cold water from the pump can be immediately switched depending on the location to be washed or the state of dirt, that is, hot or cold water at a predetermined temperature can be immediately discharged each time it is used.

However, in the conventional washing device, the pump's suction pipe is connected only to the hot water pipe 11 led out from the hot water tank connected to the hot water storage chamber 3 of the boiler, and hot water and cold water are supplied to the pump by this pipe. The hot water supply pipe 11 and the hot water storage chamber 3 of the boiler must be used in common, and therefore, when switching from hot water washing to cold water washing, it is necessary to turn off the burner switch 27 and stop the boiler operation. Ta. In response to the cleaning purpose, the boiler is equipped with a large-capacity hot water storage chamber 3 and a combustion device 6 with a high calorie combustion output, so even if the boiler combustion device 6 is stopped, the hot water in the hot water storage chamber 3 will remain for a while due to residual heat. During this period, the temperature remains close to the predetermined high temperature.

Therefore, in this case, even if the boiler operation is stopped to perform cold water washing, it is not possible to immediately switch from hot water to cold water discharge, and the hot water is preheated and stored in the hot water storage chamber 3 for a while. Therefore, a large amount of hot water must be discharged to areas that do not require hot water washing or to stains, which results in redundant thermal energy and is uneconomical. In addition, if the items to be washed are not suitable for washing with high-temperature hot water, the hot water stored in the hot water storage chamber must be discharged to the outside and the user must wait until the hot water in the large capacity hot water storage chamber 3 is replaced with cold water. , work efficiency is not good.

On the other hand, when switching from cold water washing to hot water washing, the burner switch 27 is turned on to operate the combustion device 6 of the boiler. Because cold water is stored in the hot water storage chamber 3 and must be heated again, it takes a certain amount of time to heat the cold water in the hot water storage chamber 3 to a predetermined temperature, and hot water at a predetermined temperature cannot be immediately discharged. Not only is the work efficiency not good, but it is also uneconomical in terms of fuel costs.

Therefore, in conventional washing equipment, although it is possible to switch between hot water washing and cold water washing by starting and stopping the boiler, it is not practical from the viewpoint of economy and workability as mentioned above. It is difficult to repeat this process frequently, so even if cold water washing is sufficient, hot water washing must be continued without switching from hot water washing to cold water washing, which wastes thermal energy. This is uneconomical.

The present invention solves the problems that conventional washing devices have, such as the fact that it is difficult to switch between hot water washing and cold water washing, and even if the switching is done, it is not economical or workable. The purpose is to eliminate the

``Means for Solving the Problems'' In order to solve the above problems, the present invention provides a boiler and a pump that operate independently within the machine frame, and controls the combustion of the boiler via a temperature controller. In a cleaning device that controls the combustion of the device and sprays hot or cold water from a cleaning gun connected to the pump to wash vehicles and other objects, one end is connected to the pump's suction pipe, and one end is connected to the water supply pipe to the hot water storage chamber of the boiler. Separately connect the water supply pipe whose one end is connected to the hot water storage room of the boiler or the hot water tank connected to this hot water storage room, and connect the water supply pipe and the water supply pipe with the suction pipe of the pump. A switching valve for switching the connection between the hot water supply pipe and the water supply pipe with respect to the suction pipe of the pump is interposed therein, and a control means for controlling the operation of this switching valve is provided at an appropriate position.

Therefore, as a switching valve that switches the connection between the hot water pipe and the water pipe to the pump suction pipe,
Various options are possible, for example, Figure 1 a.
As shown in the figure, one end is connected to the water supply pipe 8 to the boiler hot water storage chamber 3, and the other end is connected to the suction pipe 15 of the pump
A solenoid valve A ₁ controlled by the control means B is interposed in the water supply pipe 28 connected to the water supply pipe 28 , and one end is connected to the boiler hot water storage chamber 3 or a hot water tank connected to the hot water storage chamber 3 , and the other end is connected to the pump 14 . Suction pipe 15
In the case where a check valve _A2 that opens toward the pump 14 is interposed in the water supply pipe 11 connected to the water supply pipe 11, as shown in FIG.
In some cases, a selection switching valve (selector valve) A controlled by the control means B may be interposed at a meeting point with the suction pipe 15.

Furthermore, a general switching valve control means is used as the control means B for controlling the electromagnetic valve A ₁ as a switching valve and the selection switching valve A, and the operation mechanism (input signal transmission mechanism) of this control means is as follows. There are cases where it is installed on the side near the washing gun, etc., and cases where it is installed on the side of the machine frame where the pump and boiler are installed.

"Function" As described above, in the present invention, the piping serving as the hot water or cold water supply route to the pump 14 is separated into two systems: the hot water piping system of the hot water piping 11 and the cold water piping system of the water transmission piping 28. Since a switching valve (A or A ₁ and A _2, etc.) that switches the connection between the hot water pipe 11 and the water pipe 28 to the suction pipe 15 and a control means B that controls the operation of this switching valve are provided, the control means B When activated, the switching valve (A
or A ₁ and A ₂ etc.) through the operation of the water supply pipe 11 and the water supply pipe 28 to the suction pipe 15 of the pump 14.
connection is switched, and the discharge from the pump 14 is switched between hot water and cold water. At that time, the hot water is passed through the hot water pipe 11 connected to the hot water storage chamber 3.
The cold water is supplied to the pump 14 through the water supply pipes 28 which are not connected to the hot water storage chamber 3 but are connected to the water supply pipe 8, and are supplied to the pump 14 through different routes, so the cold water does not pass through the hot water storage chamber 3. Even when switching from hot water washing to cold water washing, the combustion device of the boiler is operated via the temperature controller.

The operation of the present invention will be explained with reference to FIGS. 1a and 1b. In FIG. 1a, when hot water washing is being performed, the solenoid valve A ₁ as a switching valve is
is not energized and the solenoid valve _A1 is closed, and the connection between the water supply pipe 28 and the suction pipe 15 of the pump 14 is cut off.
A ₂ is open to the pump 14 side due to negative pressure caused by the suction of the pump 14, and connects the hot water pipe 11 and the pump 1.
4 is electrically connected to the suction pipe 15, and hot water in the hot water storage chamber 3 passes through the hot water supply pipe 11 to the pump 1.
4 and is discharged from the discharge pipe to the cleaning gun. When switching from hot water washing to cold water washing, the solenoid valve A ₁ is energized via the control means B. Then, the solenoid valve A ₁ opens and the connection between the water supply pipe 28 and the suction pipe 15 of the pump 14 becomes conductive. The check valve _A2 is closed by the tap pressure of cold water flowing in through the water supply pipe 28, and the connection between the hot water supply pipe 11 and the suction pipe 15 of the pump 14 is cut off.
Cold water is drawn into the pump 14 from the water supply pipe 8 through the water supply pipe 28, and is discharged from the discharge pipe to the cleaning gun. In addition, switching from cold water washing to hot water washing,
The energization to the solenoid valve A ₁ is canceled via the control means B, the solenoid valve A ₁ is closed, and the connection between the water supply pipe 28 and the suction pipe 15 of the pump 14 is cut off. In this case, the water pressure due to the cold water from the water supply pipe 28 that was being applied to the check valve A ₂ is removed, so the check valve A ₂ opens.
Hot water is sucked into the pump 14 via the hot water supply pipe 11 and discharged from the discharge pipe to the cleaning gun.

In FIG. 1b, a selection changeover valve (selector valve) A is actuated by energizing or the like via a control means B, and the hot water supply pipe 11 is connected to the suction pipe 15 of the pump via the selection changeover valve (selector valve) A. By switching the connection between the pump 14 and the water supply pipe 28, the discharge of hot water and cold water from the pump 14 is switched.

``Example'' An example of implementing the present invention will be described with reference to the attached drawings FIGS. 2 to 4. A boiler 2 and a pump 14 are arranged within the machine frame 1 so that they can each operate independently. This independent operation of the boiler 2 and pump 14 is achieved by separately connecting the burner switch 27 that operates the combustion device 6 of the boiler 2 and the pump switch 24 that operates the drive motor of the pump 14 to the power source. being done. Combustion device 6
consists of a fuel pump, fuel injection nozzle, blower, blower motor, spark plug, ignition high voltage transformer, etc. that are connected to the fuel tank, and connections to these power sources are made via a burner control relay, overheat protector, CDS flame Detectors and other equipment are used to prevent boiler overheating and abnormal combustion. The boiler 2 has a combustion chamber 4 inside that is connected to a combustion device 6 and an exhaust stack 5.
The space between the inner wall of the boiler body and the inner wall of the boiler body serves as a hot water storage chamber 3 that is connected to the water supply via a water supply pipe 8 and a water supply port 7. A float valve 9 for controlling the water supply is connected to the water supply pipe 8 inside the hot water storage chamber 3, and a hand-washing pipe having a stop valve 13 is led out from the upper outside of the hot water storage chamber 3. ing. The capacity of the hot water storage chamber 3 is set to be large enough to correspond to the discharge amount of the pump 14 so that a large amount of hot water or cold water can be discharged continuously at all times for washing vehicles, etc. 6 uses a material with a high combustion output calorie so that it can effectively clean grease, oil stains, etc. that require high temperatures for cleaning. Similarly, the pump 14 has a high discharge pressure so that cleaning can be carried out efficiently. The burner switch 27 is connected to a power source via a temperature regulator 26 that is activated by a detection signal from a temperature sensor 25 provided in the hot water storage chamber 3. The combustion device 6 of the boiler is activated by operating the burner switch 27, and the temperature Combustion control is performed via the regulator 26, and the water introduced into the hot water storage chamber 3 is always heated and maintained at a predetermined set temperature by the combustion control by the temperature regulator 26.

A hot water pipe 11 is led out from above the hot water storage chamber 3 , and this hot water pipe 11 connects to the suction pipe 15 of the pump 14 via a check valve 12 that opens toward the pump 14 .
is connected to. On the other hand, a water supply pipe 28 led out from the water supply pipe 8 is connected to the suction pipe 15 of the pump 14 via a solenoid valve 10. The electromagnetic valve 10 and the check valve 12 constitute a switching valve that switches the connection of the hot water pipe 11 and the water pipe 28 to the suction pipe of the pump 14. The discharge pipe 20 of the pump 14 is connected to a high pressure hose 18 disposed outside the machine frame 1, and a cleaning gun 17 having a cleaning nozzle 16 at the tip is connected to the other end of the high pressure hose 18. There is. A stop gun mechanism 21 for opening and closing the cleaning gun 17 is provided at the base end of the cleaning gun 17.
is connected to the piping, and the discharge piping 2 of the pump 14
0 has a pressure switch 22 and an unloader valve 19.
is connected to the piping. The pressure switch 22 is activated by detecting the pressure in the discharge pipe 20 of the pump 14 and the high pressure hose 18, and the pressure in the pipe is set to the set pressure.
It has an electrical contact 22 ₁ that is turned on when the pressure is higher than P ₂ and turned off when the pressure is lower than the set pressure P ₂ . The unloader valve 19 is connected to the pump 1
This is a safety device to avoid danger when the discharge pressure of pump 14 rises abnormally, and the pressure inside the discharge pipe 20 of pump 14 and high pressure hose 18 is set to P ₃
When the above occurs, the discharge pipe 2 of the pump 14 opens.
A bypass path (not shown) is formed in the 0 system to bring the pump 14 into a nearly unloaded state and release the pressure inside the piping. Then, from this state, the stop gun mechanism 21 is opened to put the pump 14 in a completely unloaded state, and the drive of the pump 14 is stopped when the residual pressure in the piping is released to the outside, or even if the stop gun mechanism 21 remains closed. When the residual pressure in the pipe is gradually reduced due to leakage or the like and released to the outside, the unloader valve 19 returns to its original state (closed) and the bypass path is closed. The pressure in the discharge pipe 20 of the pump 14 and the high pressure hose 18 increases when the pump 14 is driven with the unloader valve 19 and the stop gun mechanism 21 closed, and therefore the pressure in the pipe increases to the pressure switch 22. When the set pressure P ₂ is reached, the contact 22 ₁
is turned on, but the pressure increase in the pipe instantly reaches the set pressure _P3 of the unloader valve 19, and the unloader valve 19 opens, causing the pressure in the pipe to drop rapidly and become below the set pressure _P2 of the pressure switch 22. ,
Contact 22 ₁ of pressure switch 22 goes from on to off almost instantaneously. The contact 22 ₁ of this pressure switch is inserted into the energization control circuit of the solenoid valve 10 as shown in the third diagram, one end of this contact 22 ₁ is connected to the power source E via the pump switch 24, and the other end is connected to the power supply E via the pump switch 24. is installed in the machine frame 1, and one end is connected to the other end of a coil ₂₃₁ of a solenoid valve control circuit 23 consisting of a cam clutch relay connected to a power source E. The electromagnetic valve control circuit 23 consisting of a cam clutch relay has an output contact 2 which is switched between on and off positions via a cam rotated by a movable iron piece that is attracted to the coil 23 ₁ when the coil 23 ₁ is energized.
3 has ₂ . The cam does not operate when the movable iron piece returns to its original position when the current to the coil 23 ₁ is cut off. Therefore, output contact 2
3 ₂ is switched between on and off positions as the cam operates every time the coil 23 ₁ is energized via the pump switch 24 by turning on the contact 22 ₁ of the pressure switch 22. Even if the coil 23 ₁ is de-energized by turning off the contact 22 ₁ of the switch 22 or the pump switch 24, the coil 23 _{1 will not be energized until the next input signal is received by turning on the contact 22 1 of} the pressure switch 22. It is held in either the on or off position switched when electricity is applied. One end of this output contact 23 ₂ is connected to the power supply E via the pump switch 24, and the other end is connected to the other end of the coil 10 ₁ of the solenoid valve 10 whose one end is connected to the power supply E. There is. Therefore, the solenoid valve 10 is controlled by the solenoid valve control circuit 2.
When the coil 10 ₁ is energized via the pump switch 24 by turning on the output contact 23 ₂ of No. 3, the valve is opened and the connection between the water supply pipe 28 and the suction pipe 15 of the pump 14 becomes conductive. Further, when the coil 10 ₁ is de-energized by turning off the output contact 23 ₂ of the electromagnetic control circuit 23 or the pump switch 24, the electromagnetic valve 10 closes, and the water supply pipe 28 and the suction pipe 15 of the pump 14 are connected to each other. connection is interrupted.

The open or closed state of the solenoid valve 10 is
This state is maintained until the output contact 23 ₂ is switched between on and off positions by the next input signal caused by turning on the contact 22 ₁ of the pressure switch 22 .
The stop gun mechanism 21 and the pressure switch 22
and a solenoid valve control circuit 23 consisting of a cam clutch relay constitute control means for the solenoid valve 10. The pump 14 is operated by driving the motor as the electromagnetic switch Mg is energized by turning on the pump switch 24 . Note that a display member may be attached to display the type of cleaning (hot water, cold water) by interlocking with the opening and closing of the stop gun mechanism 21, etc.

The operation of the cleaning device according to the above embodiment will now be explained. When starting the next cleaning operation after stopping or interrupting the cleaning operation, hot water heated and maintained at a predetermined temperature is stored in the hot water storage chamber 3 of the boiler due to prior operation or use of the cleaning device before the interruption. That is, boiler switch 27
Due to the independent operation of the combustion device 6 when the combustion device 6 is turned on, the cold water introduced from the water supply into the hot water storage chamber 3 to a predetermined water level via the water supply port 7, water supply pipe 8, and float valve 9 is detected by the detection signal of the temperature sensor 25. The heated water is heated to a predetermined set temperature by the temperature regulator 26 which operates based on the temperature controller 26, and the hot water is maintained at the predetermined set temperature by the control of the combustion device 6 by the temperature regulator 26 and stored. There is. At this stage, pump switch 24 is still off and operation of pump 14 is stopped.

At this point, the pump switch 24 is turned on as the cleaning work begins.
When turned on, the pump 14 is operated by the motor driven by energizing the electromagnetic switch Mg of the drive motor of the pump 14, and the control means consisting of the stop gun mechanism 21, pressure switch 22, and electromagnetic valve control circuit 23 is activated. Coil 10 of solenoid valve 10
The electromagnetic valve 10 is opened or closed by energizing or de-energizing the solenoid valve ₁ . The output contact 232 of the solenoid valve control circuit 23, which opens and closes the connection of the coil ₁₀₁ of the solenoid valve 10 to the power source _E , is switched on and off by using the contact of the pressure switch 22 when the pump switch 24 is on. 2
2 ₁ is turned on, the output of the solenoid valve control circuit 23 at the start of the next cleaning operation depends on the type of cleaning (hot water washing or cold water washing) when the washing operation is stopped or interrupted. Contact 23 ₂
is in either the on or off position. If the washing at the time of stopping or interrupting the washing operation is hot water washing, the output contact ₂₃₂ of the solenoid valve control circuit 23 will be activated by the closing operation of the trap gun mechanism 21 when the hot water washing is stopped or interrupted, as shown in Figure 4. Pressure switch 22 based on the pressure increase in the discharge pipe 20 of the pump 14 and the high pressure hose 18
It is switched from off to on by turning on contact ₂₂₁ . The contact 22 ₁ of the pressure switch 22 is turned off due to the pressure drop in the pipe due to the opening of the unloader valve 19, and then turned off at the next moment. The unloader valve 19 changes from an open state when the stop gun mechanism 21 is closed to a closed state when the pump 14 stops operating and the residual pressure in the pipe is gradually reduced due to leakage or the like and is released to the outside. . The solenoid valve 10 is once opened when the output contact 23 ₂ of the solenoid valve operating circuit 23 is turned on, but is closed when the pump switch 24 is turned off to cut off the current supply. The check valve 12 is a solenoid valve 10
It opens as it closes.

In this state, when the pump switch 24 is turned on to start the cleaning operation, the solenoid valve 10 opens once and the check valve 12 closes, but immediately the output contact 23 ₂ of the solenoid valve control circuit 23 closes.
By switching, the solenoid valve 10 closes and the check valve 12 opens, allowing hot water washing. That is,
When the pump switch 24 is turned on, the output contact 2 of the solenoid valve control circuit 23 is already in the on position.
Since the coil 10 ₁ of the solenoid valve 10 is energized via the solenoid valve ₁₂ , the solenoid valve 10 opens, and cold water is sent from the water supply pipe 28 to the suction pipe 15 of the pump 14 at water pressure, and the check valve 12 is closed by the water pressure of this cold water. The cold water supplied to the pump 14 is pressurized to a predetermined pressure P ₁ (for example, 80 kg/cm ² ) by the pump 14 and is discharged from the discharge pipe 20, but at this time the stop gun mechanism 21 is still closed and the unloader valve is also closed. When closed, the discharge pipe 20 and the high pressure hose 18 are in a sealed state, so the cold water discharged from the discharge pipe 20 is not sprayed from the washing gun 17 or discharged to the outside through the bypass path. Therefore, the cold water discharged from the discharge pipe 20 is confined within the discharge pipe 20 and the high-pressure hose 18, and the discharge pressure of this cold water and the pressurization from the pump 14 cause the discharge pipe 20 and the high-pressure hose 18 to be confined. The pressure inside increases rapidly, and the pressure reaches the set pressure P ₂ of the pressure switch 22 (for example, 90
Kg/cm ² ), the pressure switch 22 is activated and its contact 22 ₁ is turned on. Then, when the contact 22 ₁ of the pressure switch 22 is turned on, the coil 23 ₁ of the solenoid valve control circuit 23 is energized via the pump switch 24 (on), and its output contact 23 ₂ is switched from on to off. , the energization of the coil of the solenoid valve 10 is removed, so the solenoid valve 10 is closed. When the solenoid valve 10 is closed, the supply of cold water from the water supply pipe 28 to the suction pipe 15 of the pump 14 is stopped, and the water pressure due to this cold water is released, so the check valve 12 interposed in the hot water supply pipe 11 is closed. It is opened by negative pressure caused by suction from the pump 14, and hot water at a predetermined temperature stored in the hot water storage chamber 3 is sucked into the pump 14 through the hot water supply pipe 11 through the suction pipe 15, pressurized, and then discharged from the discharge pipe 20. be done. At this time, the stop gun mechanism 21 is still closed, but the unloader valve 19 is open, so the discharge piping 20 is
Then, the pressure inside the high pressure hose 18 will not increase. That is, when high-pressure cold water is discharged from the discharge pipe 20 before hot water is discharged, the pressure inside the discharge pipe 20 and the high-pressure hose 18 increases instantaneously, causing the pressure inside the pipe to rise instantly to the unloader valve 19.
As a result, the unloader valve ₁₉ opens and a bypass path is formed in the discharge piping ²⁰ system, and the high-pressure cold water discharged into the piping passes through the bypass path. The hot water is then discharged into the hot water storage chamber 3, etc., and the pressure inside the piping drops rapidly. Therefore, since the stop gun mechanism 21 is closed and the unloader valve 19 is open, the high-pressure hot water discharged from the discharge pipe 20 after switching from the cold water discharge to the hot water discharge flows into the hot water storage chamber 3 through the bypass path. Therefore, there is no pressure increase in the piping due to this high-pressure hot water discharge. Note that the contact point 22 ₁ of the pressure switch 22 is turned on due to the pressure increase in the pipe when discharging high-pressure cold water, and then the pressure in the pipe changes to the set pressure P ₂ due to the sudden drop in pressure in the pipe due to the opening of the unloader valve 19. As a result, the solenoid valve control circuit 2 turns off almost instantaneously.
However, the switching position of the output contact ₂₃₂ is mechanically maintained by the cam of the solenoid valve control circuit ₂₃ consisting of a cam clutch relay, so the pressure switch 22 Even if contact 22 ₁ is turned off, the solenoid valve control circuit 23
The output contact 23 ₂ of the pressure switch 22 remains in the switched off state until the next contact 22 ₁ of the pressure switch 22 is turned on. Therefore, since the coil ₁₀₁ of the solenoid valve 10 is energized, the solenoid valve 10
The closed state of is also maintained.

The above is the operation at the preliminary operation stage in FIG.
0 is closed and the check valve 12 is opened, hot water is being supplied via the water supply pipe 11. If the stop gun mechanism 21 is opened at this point, the hot water remaining in the discharge pipe 20 and the high pressure hose 18 will be removed. The heated water is discharged to the outside, and the unloader valve 19 returns to its original position, closing the bypass path, so the discharge piping system of the pump 14 returns to a pressurized state, improving the performance of the pump 14 and the cleaning gun 17. A predetermined pressure P ₁ determined by the hole diameter of the cleaning nozzle 16
Hot water at a predetermined temperature (e.g. 80° C.) in the hot water storage chamber ³ is continuously jetted from the washing nozzle 16 at a predetermined discharge rate (e.g. 700/h) to perform hot water washing. .

Next, when the stop gun mechanism 21 is closed to stop hot water washing (hot water injection from the washing nozzle 16), the unloader valve 19 is closed, so the discharge pipe 20 of the pump 14 and the high pressure hose 1 are closed.
The pressure inside 8 is the discharge pressure of the hot water that was being discharged, the shock pressure of the hot water due to the stop gun mechanism closing, and the pump 14.
When the pressure increases rapidly due to increased pressure and reaches the set pressure _P2 of the pressure switch 22, the contact ₂₂₁ of the pressure switch 22 changes from OFF to ON.
The coil 23 ₁ of the solenoid valve control circuit 23 is energized and its output contact 23 ₂ is switched from off to on,
When the coil of the solenoid valve 10 is energized, the solenoid valve 10
opens. Therefore, the pump 1 is removed from the water supply pipe 28.
Cold water is fed into the suction pipe 15 of No. 4 at water pressure,
The check valve 12 is closed by the tap pressure of the cold water, and hot water suction from the hot water pipe 11 to the suction pipe 15 of the pump 14 is stopped. The contact point 22 ₁ of the pressure switch 22 is, as described above, momentarily triggered by the pressure drop in the pipe (drop below the set pressure P ₂ of the pressure switch 22) due to the opening of the unloader valve 19 due to the rise in pressure in the pipe. However, the output contact 23 ₂ of the solenoid valve control circuit 23 is kept in the on state, and the solenoid valve 10 is also kept open. Therefore, when the stop gun mechanism 21 is opened, the unloader valve 19 returns to its original state, and the pump 14
Pressurized cold water is discharged from the discharge pipe 20, and the cold water is in turn jetted from the cleaning nozzle 16 at the tip of the cleaning gun 17, thereby performing cold water cleaning. When the stop gun mechanism 21 is closed to stop cold water washing, the pressure increase in the pipe causes the contact 22 ₁ of the pressure switch 22 to switch from OFF to ON, and the output contact 23 ₂ of the solenoid valve control circuit 23 to switch from ON to OFF. The energization of the coil 10 ₁ of the solenoid valve 10 is terminated and the solenoid valve 10 is closed, and the check valve 12 is opened to prepare for hot water washing.

Thereafter, by repeating this operation, it is possible to alternately switch between hot water washing and cold water washing as shown in the fourth figure. That is, each time the stop gun mechanism 21 is operated to close the piping system of the discharge piping 20 of the pump 14, the solenoid valve 10 and The opening and closing of the check valve 12 is alternately switched, that is, the open valve is closed,
Since the closed valve becomes open, the suction pipe 15 of the pump 14
The connections between the water supply pipe 28 and the hot water supply pipe 11 are alternately switched, and suction of hot water and cold water to the pump 14 is switched, and when the stop gun mechanism 21 is operated and opened, the discharge of hot water and cold water is switched. As mentioned above, the time from when hot water or cold water injection is stopped by the closing operation of the stop gun mechanism 21 until the unloader valve 19 opens and a bypass is formed, and from the time when the stop gun mechanism 21 is opened: The time until the unloader valve closes, the bypass closes, and the hot or cold water starts being sprayed from the cleaning nozzle 16 is almost instantaneous, and does not pose any problem during the cleaning operation.

In addition, in the above embodiment, the switching means for connecting the water supply pipe and the hot water supply pipe to the suction pipe of the pump via the switching valve, and the control means for controlling the operation of the switching valve are merely one embodiment of the configuration of the present invention. However, the present invention is not limited to this, and design changes may be made as appropriate without departing from the gist of the present invention.

For example, instead of separately connecting the water supply pipe and the hot water supply pipe to the suction pipe of the pump and interposing a switching valve in each of the water supply pipe and the hot water supply pipe, the water supply pipe can be connected as shown in Fig. 1b. The water supply pipe, the water supply pipe, and the suction pipe of the pump may be connected together in one place, and a single selection changeover valve (selector valve) may be interposed at the meeting point of the three. Even when a switching valve is interposed in each of the water supply pipe and the hot water supply pipe, instead of using a combination of a solenoid valve and a check valve, it is possible to use solenoid valves for both and reverse the opening and closing operations. Alternatively, instead of using a solenoid valve as the switching valve, a valve that opens and closes using pneumatic pressure or hydraulic pressure, or a valve that opens and closes mechanically such as a stop valve may be used. Furthermore, instead of using a solenoid valve control circuit consisting of a stop gun mechanism, a pressure switch, and a cam clutch relay as a control means for controlling the operation of the changeover valve, the operation of the changeover valve is controlled electrically.
Appropriate mechanical or optical control means may be used, in which case the operating mechanism (input signal transmission mechanism) for operating the control means may also be located on the hand side of the cleaning gun, etc.
It may be placed on either side of the machine frame of the washing device. A brief description of an alternative means of controlling such a switching valve is as follows. For example, a flip-flop circuit that performs the same operation as a cam clutch relay is used instead of a cam clutch relay as a solenoid valve control circuit, and a switching signal is inputted to this circuit by an appropriate means such as a stop gun mechanism or a pressure switch. A relay control circuit for a solenoid valve or a switching circuit using a semiconductor element is connected to the electrical wiring that is connected to the cold water changeover operation switch and installed inside the machine frame of the cleaning device along the high-pressure hose. Also, those with the switching operation switch mounted on the machine frame side, those with the switching operation switch installed on the cleaning gun side or the machine frame side that doubles as an on/off switch for the energizing circuit of the solenoid valve, and those installed on the cleaning gun and operated. A device consisting of a wireless transmitter circuit and a wireless receiver circuit that is placed inside the machine frame and receives the transmitter signal and outputs the signal to the relay control circuit of the solenoid valve, and the transmitting antenna of the wireless transmitter circuit is connected to a high-pressure hose. an optical operating mechanism installed in the cleaning gun, and an optical fiber conductor introduced from this operating mechanism into the machine frame along a high-pressure hose. , an optical receiver consisting of a light-emitting element, etc., a transmitting mechanism, and a photoelectric circuit having an output signal to the relay control circuit of the solenoid valve, which utilizes a piezoelectric element installed in the washing gun. an operating mechanism, a signal communication line introduced from this operating mechanism into the machine frame along a high-pressure hose, and a relay control circuit for semiconductor elements and solenoid valves that operate in response to signals from the operating mechanism; A mechanical opening/closing valve such as a stop valve may be used as the switching valve, and the opening/closing of the switching valve may be performed on the machine frame side using a knob, lever, or the like.

In the above embodiment, the pressure switch 22 is used as a switching signal input member to the electromagnetic valve control circuit 23, and the contact ₂₂₁ is turned on and turned off instantaneously due to the pressure drop in the pipe due to the opening of the unloader valve 19. However, since the contact ₂₂₁ of the pressure switch 22 is turned on when the stop gun mechanism 21 is closed when switching the next washing mode, it is only necessary to turn off the contact 221 by then. In reality, when the stop gun mechanism 21 is opened during cleaning, the pressure inside the pipe drops below the set pressure of the pressure switch 22, so it is not always necessary to turn on the contact ₂₂₁ of the pressure switch 22 via the unloader valve 19. It is not necessary to turn off the pressure switch 22 instantaneously, and it is sufficient if the contact ₂₂₁ of the pressure switch 22 continues to be turned on until the stop gun mechanism 21 is opened. However, in this case, the pressure inside the pipe will rise even if there is a leak until the stop gun mechanism 21 is opened, and the pressure will become high. Therefore, the pipe must be constructed as a pressure-resistant pipe that can withstand this pressure, or the pressure switch 22 must be equipped with a pressure regulating mechanism. It is necessary to devise measures such as allowing the discharged water to flow out into the hot water storage chamber little by little.

"Effects of the invention" As mentioned above, the invention has the following advantages in the cleaning device:
The piping system for supplying hot water and cold water to the pump is separated into two systems, a hot water piping system and a cold water piping system, and a switching valve is interposed in this piping system, and by switching the switching valve, the hot water piping system for the pump is separated. Since the connection between the cold water piping system and the cold water piping system is switched, the problems of the conventional device are solved and the following effects are achieved.

First, hot water or cold water is not supplied to the pump through a common boiler storage chamber and hot water piping as in the past, but instead hot water is supplied through the hot water piping and cold water is supplied through the water piping separately. This eliminates the need to switch between hot water washing and cold water washing by starting and stopping the combustion equipment of the boiler, as was the case in the past. By simply switching the connections between the two lines of piping to the pump by operating the switching valve while maintaining the operating state, it is possible to immediately switch between hot water washing and cold water washing. It is possible to use hot or cold water,
Therefore, it is superior in cleaning efficiency and economy compared to the conventional method.

In other words, when switching from cold water washing to hot water washing, hot water that is always stored at a predetermined temperature in the hot water storage chamber of the boiler can be immediately injected from the washing gun. There is no need to interrupt the cleaning operation and wait until the cold water stored in the room is heated to a predetermined temperature by the operation of the combustion device of the boiler. Also,
When switching from hot water washing to cold water washing, the supply of hot water in the hot water storage chamber is immediately stopped, and cold water from the tap is supplied to the pump from the cold water piping system and sprayed through the washing gun, so it is not possible to use the same method as before. This prevents the uneconomical effects of wasteful consumption of thermal energy due to the discharge of hot water that had been stored in the hot water storage chamber for hot water washing at the time of switching to cold water washing. In other words, the hot water stored at a predetermined temperature in the hot water storage chamber is effectively used only for its original purpose of hot water washing, and moreover, the hot water at the predetermined temperature that is required can always be used immediately at the time of use.

Second, since it is possible to immediately discharge hot or cold water at a predetermined temperature suitable for the cleaning purpose at the time of use, it is possible to immediately discharge hot or cold water at a predetermined temperature suitable for the cleaning purpose, so depending on the type, nature, dirtiness, etc. of the object to be cleaned, the most suitable hot or cold water can be used for cleaning. It is suitable for use because cold water washing can be changed frequently and easily.

Third, in terms of structure, simply adding a piping route for a cold water piping system to the structure of a conventional car wash device, and providing a switching valve and its control means for switching the connection between the hot water piping system and the cold water piping system to the pump. Therefore, the overall structure is relatively simple and suitable for manufacturing and assembly, and since the operation is simply switching the switching valve, it is suitable for use.

In addition, hot water can be used for purposes other than washing hands, etc.In cold weather, the boiler can be operated independently at the temperature setting required to prevent freezing via a temperature controller, allowing water to be drained from the boiler to prevent freezing. The functions and effects of this system are the same as those of the conventional system, such as eliminating the need for radiant heat emitted from the hot water boiler and keeping main equipment such as the pump installed inside the machine frame warm.

As shown in the above embodiment, if the operating mechanism (input signal transmitting mechanism) of the control means of the switching valve is placed close to the user of the washing gun, hot water washing and cold water washing can be switched by remote control. Since switching can be done easily, when the operating mechanism is installed on the machine frame side of the cleaning device, which is far away from the cleaning gun,
There is no need to drag a high-pressure hose or temporarily interrupt the cleaning work due to switching, and the cleaning work can be performed efficiently and comfortably. In addition, if a stop gun mechanism connected to the cleaning gun via piping and a pressure switch operated by the pressure inside the piping are used as the operating mechanism, there is no need for special switching operations, and it can be used to start and stop cleaning operations. Since the switching operation is performed by opening and closing the switch gun mechanism, the cleaning operation can be performed more efficiently. Furthermore, when using a solenoid valve control circuit consisting of a pressure switch and a cam clutch relay, etc., the switching valve is maintained in the open/closed position by the solenoid valve control circuit, and the pressure switch simply sends a switching signal to the solenoid valve control circuit. Since it is only necessary to have an input function, there is no need to take measures such as maintaining the pressure in the piping at a specified level, and the normal pressure fluctuations in the piping during cleaning operations can be used as is, and the piping configuration This is advantageous, and the cleaning mode can be switched reliably.

[Brief explanation of drawings]

1a and 1b are explanatory diagrams schematically showing an example of the basic configuration of the present invention, and FIG.
This figure schematically shows an example of the implementation of the present invention including a specific example of the switching valve control means B in Figure a.
A partially cutaway front view, Figure 3 is a diagram of the energization control circuit for the pump drive motor and solenoid valve, and Figure 4 is
2nd when switching between hot water washing and cold water washing
FIG. 5 is a timing chart showing the operation of the main components of the device shown in the figure. FIG. 5 is a block diagram conceptually showing the structure of the piping system and electrical system of the conventional cleaning device. 1... Machine frame, 2... Boiler, 3... Hot water storage room, 4
... Combustion chamber, 6 ... Combustion device, 8 ... Water supply pipe, 1
0...Solenoid valve, 11...Hot water pipe, 12...Check valve, 14...Pump, 15...Suction pipe, 17...
...Washing gun, 18...High pressure hose, 19...Unloader valve, 20...Discharge piping, 21...Stop gun mechanism, 22...Pressure switch, 23...Solenoid valve operating circuit, 24...Pump switch, 25...
... Temperature sensor, 26 ... Temperature controller, 27 ... Burner switch, 28 ... Water pipe, A ... Selection changeover valve (selector valve), A ₁ ... Solenoid valve, A ₂ ... Check valve, B ...control means.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A washing gun that includes a boiler and a pump that operate independently within the machine frame, controls the combustion device of the boiler via a temperature controller, and is connected to the pump. In a washing device that sprays warmer or colder water to wash vehicles and other objects, a water supply pipe is connected to the pump's suction pipe, one end of which connects to a water supply pipe to the boiler's hot water storage room, and one end of which connects to the boiler's hot water storage room or the water supply pipe. A hot water pipe connected to a hot water tank connected to this hot water storage room is connected, and a connection between the hot water pipe and the water pipe to the pump suction pipe is made between this hot water pipe and the water pipe and the pump suction pipe. A washing device characterized in that a switching valve is interposed therebetween, and control means for controlling the operation of the switching valve is provided at an appropriate position. (2) As a switching valve to switch the connection between the hot water pipe and the water pipe to the pump suction pipe, insert a solenoid valve in the water pipe and a check valve that opens toward the pump in the water pipe, or A washing device according to claim 1, wherein electromagnetic valves whose opening and closing operations are opposite to each other are interposed in both hot water pipes. (3) A utility model registration request for a selective switching valve interposed at the meeting point of the hot water pipe, the water pipe, and the pump suction pipe as a switching valve that switches the connection of the hot water pipe and the water pipe to the pump's suction pipe. The cleaning device according to scope 1. (4) Scope of Utility Model Registration Claims Paragraph 1 and Paragraph 1, in which an operating mechanism for a control means for controlling the operation of a switching valve that switches the connection between the hot water pipe and the water pipe to the suction pipe of the pump is provided on the hand side of a washing gun, etc. The cleaning device according to item 2 or 3. (5) Utility model registration request for an operating mechanism for a control means that controls the operation of a switching valve that switches the connection of the hot water pipe and the water pipe to the pump suction pipe on the side of the machine frame in which the boiler and pump are installed. The washing device according to Item 2 or 3 of Range 1.