JPS6212469Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automobile washing device to which a large number of washing guns can be attached.

Generally, in gas stations, automobile factories, repair shops, and the like, a large number of cleaning guns may be required in order to wash automobiles and parts at a large number of workplaces. Conventionally, there has been a car washing device for automobiles which includes a pump installed in the hot water supply pipe of a boiler and a washing gun attached to the discharge pipe of the pump (for example, Japanese Utility Model Publication No. 15096/1983). In order to obtain a large number of cleaning guns using this device, it is necessary to increase the size of the entire device or install a plurality of small-sized guns, but in these cases, there are the following drawbacks.

(1) If the equipment is made larger, a large boiler and pump must be kept in operation regardless of the number of cleaning guns used for cleaning, which is uneconomical in terms of fuel, electricity, etc. Furthermore, if the equipment breaks down, all the cleaning guns become unusable, which poses a problem not only to the cleaning work but also to subsequent processes.

(2) If each workplace is equipped with one cleaning device and two or three cleaning guns are installed, the cleaning guns installed at each workplace cannot be used at other workplaces, so one
When a full-cleaning gun is used at one work site, it is inconvenient to move a car or the like to another work site. If one cleaning device breaks down, it must be moved to another work station as well.

The purpose of the present invention is to provide a device that can eliminate the above drawbacks, and its feature is that the discharge pipes of pumps installed in multiple boilers or water tanks are connected to one main pipe. A large number of cleaning guns with hand-held handles are installed in the main pipe, and a pressure switch is installed in the discharge pipe of each pump to control the start and stop of the pumps, and the necessary pumps are operated according to the number of cleaning guns used. It's about doing.

An example of implementing the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing one embodiment of the device of the present invention, and FIG. 2 is a configuration diagram of the main parts. In the figure, 1 is a water supply port, 2 is a boiler, 3 is a fuel tank,
4 is a fuel filter, 5 is a combustion burner, 6 is a water tank provided between the water supply port 1 and the boiler 2, and the water supplied to the boiler 2 is heated by the burner 5. Reference numeral 7 denotes a pump installed in the hot water pipe of the boiler 2, and 8 a temperature regulator attached to the boiler 2, which detects the temperature and causes the burner 5 to be ignited and extinguished. 9
10 is a discharge pipe of the pump 7, and 10 is an unloader valve attached in the middle of the discharge pipe 9, which includes a check valve 11, a relief valve 12, a push rod 13 that presses and opens the relief valve 12, and a check valve 11. Consisting of a communication path 14 that communicates the secondary side with the pressure receiving part of the push rod 13 and a return pipe 15 that communicates the secondary side of the relief valve 12 with the water tank 6, the secondary side pressure of the check valve 11 is When the pressure rises, push the pressure 13
The rod 13 opens the relief valve 12 and the hot water discharged from the pump 7 is returned to the water tank 6.

As shown in FIG. 1, in this embodiment, the hot water supply system configured as above is composed of No. 1 unit _A1 , No. 2 unit A2, No. ₃ unit A3,
The discharge pipes 9 of each of the _three units are connected to one main pipe 16.
The main pipe 16 is connected to a car wash or other work site (not shown), and each work site is provided with a number of cleaning guns 17 according to the frequency of use. Each cleaning gun 17 has a hand cock 18 and is preferably provided so as to be freely attached via a flexible pipe 19. The No. 2 and _No. 3 hot water supply devices A2 and _A3 are provided with their respective pumps 7.
A pressure switch 20 for controlling the start and stop of the discharge pipe 9 is provided after the unloader valve 10 of each discharge pipe 9. As shown in Fig. 2, the switch 20 has an upper limit setting section 21 and a lower limit setting section 22, and when the pressure in the discharge pipe 9 exceeds the upper limit setting, the pump drive motor is turned off to stop the operation of the pump 7, and when the pressure falls below the lower limit, it is started. The remaining No. 1 hot water supply device _A1 is not provided with a pressure switch 20, and the pump 7 has a characteristic that when not in use, the unloader valve 10 operates to continue unloaded operation, and automatically switches to loaded operation when the pressure in the discharge pipe 9 decreases. The relationship between the start and stop of the pump ₇ and the transition from unloaded to loaded operation of the _three hot water supply devices A1, _A2 , and A3 and the pressure in the discharge pipe 9 is as shown in Fig. 3, which will be made clear in the explanation of operation described later.

The operation of the cleaning device having the above configuration will be explained.

Preparation operation (1) Prepare all cleaning guns 17 at hand in advance 1
8, and start the burner 5 and pump of each unit. The burner 5 stops extinguishing when the water supply in the boiler 2 reaches the set temperature of the temperature regulator 8. Although not shown, in order to prevent the boiler 2 from running dry, the boiler 2 or the water tank 6
A water level gauge for controlling the start/stop of the burner 5 is installed inside the burner. Further, in the embodiment shown in FIG. 2, a fuel tank 3 is provided for each burner 5, but using a large external tank is more advantageous in terms of refueling cycle and the like.

(2) The pressure inside the main pipe 16 and the discharge pipe 9 increases due to the operation of each pump 7, and the upper limit setting value at each pressure switch 20 of the No. 2 and No. 3 water heaters A ₂ and A ₃ (in Fig. 3, the pressure inside the main pipe 16 and the discharge pipe 9 increases). is 55Kg/
cm ² , and the second unit reaches 65Kg/cm ² ), each unit
The pumps 7 of A ₂ and A ₃ stop.

(3) Pump 7 of the remaining No. 1 unit continues to operate, and the No. 3 pump
As shown in the figure, the pressure rises above the no-load operating pressure of the pump 7. At this time, unloader valve 1
At 0, the pressure on the secondary side of the check valve 11 is applied to the push rod 13 through the communication path 14, and the rod 13 is pushed down to open the relief valve 12 and allow hot water discharged from the pump 7 to escape. Here, unless the hand knob 18 of the cleaning gun 17 is opened, the check valve 11
The pressure in the discharge pipe 9 and the main pipe 16 is maintained by this. In this way, the hot water discharged from the pump 7 flows through the relief valve 12 and the return pipe 15 to the water tank 6, and the head pressure of the pump 7 becomes ^{approximately} 2 to 3 kg/cm2, and as shown in FIG. 7 is in the no-load operation region A ₁ L', and the current consumption of the drive motor is about 1/3 of the load current.

Operation during cleaning work (1) First, when one cleaning gun 17 is used, there is sufficient water volume and pressure due to the preparatory operation, but the pressing force of the spring of the push rod 13 in the unloader valve 10 must be adjusted with the adjustment nut. Since the discharge pressure on the secondary side of the check valve 11 is regulated by this, pressure exceeding the regulated pressure is released through the relief valve 12 which is pushed open by the push rod 13. Thus, hot water at a predetermined pressure and flow rate is discharged from the cleaning gun 17 at the same time as the hand pot 18 is opened.

(2) When two cleaning guns 17 are used, check valve 1
The secondary side discharge pressure of 1 is
Since the pressure becomes lower than the adjusted pressure, the relief valve 12 is closed, and all the hot water discharged from the pump 7 is supplied to the cleaning gun 17 via the check valve 11. Therefore, as shown in FIG.
A Maintain stable pressure and flow rate at ₁ L.

(3) When three cleaning guns 17 are used, the main pipe 16
The pressure in the discharge pipe 9 of the No. 2 hot water supply system A2, which is connected to the No. 2 water heater _A2 , momentarily drops below the lower limit setting pressure _A2 min of the pressure switch 20, so the switch 20 is activated and the drive motor of the No. 2 pump 7 is activated. Activate. Therefore, as in (1) above, the check valve 11
While the discharge pressure on the secondary side is higher than the adjustment pressure of the push rod 13, excess pressure is released through the relief valve 12. Therefore, as shown in FIG. 3, the discharge pressure and flow rate from the cleaning guns 17 are kept constant, and this state is maintained until the number of cleaning guns 17 increases to six.

(4) Furthermore, when seven or more cleaning guns 17 are used, the No. 3 water heater A ₃ connected via the main pipe 16
Since the pressure in the discharge pipe 9 becomes below the lower limit setting pressure A ₃ min of the pressure switch 20, the switch 2
0 operates and starts the drive motor of the pump 7 of the No. 3 pump. However, similarly to (3) above,
The discharge pressure flow rate from the cleaning gun 17 is kept constant. However, the number of cleaning guns 17 that can be used is the permissible number (1 gun at hand when all units 1 to 3 are operated).
The number of cleaning guns that can be used to maintain a constant pressure and constant flow rate with 8 fully closed is set in advance. ), the discharge pressure flow rate from each cleaning gun 17 decreases.

Decrease in the number of cleaning guns used (1) When the number of cleaning guns used decreases from 6 to 5,
The pressure in the main pipe 16 and the discharge pipe 9 increases, and as shown in FIG. 3, the pressure exceeds the upper limit setting pressure A ₃ max of the pressure switch ₂₀ of the No. 3 water heater A 3,
The switch 20 is opened, and the pump 7 of the No. 3 unit is opened.
Stop the drive motor.

(2) Furthermore, if the number of cleaning guns used is reduced to two,
The pressure in _the main pipe 16 and the discharge pipe 9 rises again, and as shown in _FIG . The drive motor of the pump 7 of the machine is stopped.

(3) In addition, the number of cleaning guns used has decreased to 18.
When all are closed, as in (3) above, Unit 1 A ₁
The unloader valve 10 operates, and the pump 7 of the No. 1 water heater A ₁ shifts to no-load operation, preparing for the resumption of use of the cleaning gun 17.

As explained above, in the present invention, a plurality of cleaning devices are connected through a main pipe, and a large number of cleaning guns are attached to the main pipe, and only the required number of cleaning devices are operated according to the number of cleaning guns used. It has the following specific effects.

(1) Since the necessary amount of cleaning water is always supplied to the cleaning gun using the minimum number of pumps and at a constant pressure and flow rate, it saves a lot of power and fuel compared to using one large cleaning device. can.

(2) Even if the number of cleaning guns used changes from a small number to a large number, cleaning water can always be discharged at a constant pressure and constant flow rate.

(3) Conventionally, when equipment breaks down, cleaning operations must be stopped, and the equipment must be replaced or the vehicle to be cleaned must be moved in order to have the equipment repaired or to use another cleaning equipment. However, with the device of the present invention, the discharge pressure and flow rate are supplemented by a device other than the device undergoing malfunction, repair, or inspection, so even if the number of usable tubes is slightly reduced, the cleaning work itself may be hindered. There is no.

(4) Just by piping the main pipe to each work site, the required number of cleaning guns can be placed at each work site, eliminating the need to move cars and other vehicles to special cleaning sites for cleaning, as was the case in the past. Everything from acceptance inspection to car washing, inspection, and repair can be done in the same location. In particular, if the cleaning guns are made detachable, the number of cleaning guns installed at each work site can be changed, which is convenient.

(5) Unlike conventional pumps, there is no need to operate a switch each time the pump is used, and the pump automatically starts and stops as needed by opening and closing the handle, making it more efficient.

(6) Since at least one pump is always operated without load, cleaning water can be discharged at the desired discharge pressure and flow rate as soon as the pump is opened. Moreover, since it is operated without load, the cost is kept to a minimum.

Incidentally, since all the discharge pipes communicate with the main pipe and there is no difference in the pressure inside the two pipes, the pressure switch can be provided not only in each discharge pipe but also in the main pipe.
In that case, the pressure switch can increase or decrease the number of pumps 7 used in stages according to pressure fluctuations in the main pipe.

By the way, in the actual use of cleaning guns, it is rather rare that all the cleaning guns are used with the handles fully open; one is half-open, and one is
Since books are used in a situation where they are 1/4 open, in reality, the number of cleaning guns used is not necessarily proportional to when each pump starts and stops. Therefore, in reality, cleaning work can be performed using more cleaning guns than the above-mentioned permissible number. In short, the operation of starting and stopping each pump depends on the internal pressure of the discharge pipe or main pipe, which varies depending on the state of use of the cleaning gun, the number of cleaning guns used, etc.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; Fig. 1 is a circuit diagram of the device of the present invention, Fig. 2 is a configuration diagram of the main parts, and Fig. 3 shows the relationship between the number of cleaning guns used and the discharge pressure. FIG. In the above figure, each symbol indicates the following. 1: Water supply port, 2: Boiler, 3: Fuel tank, 4: Fuel filter, 5: Combustion burner, 6: Water tank, 7: Pump, 8: Temperature regulator, 9: Discharge pipe, 10: Unloader valve, 11 : Check valve, 12: Relief valve, 1
3: Push rod, 14: Communication path, 15: Return pipe, 16: Hand pipe, 17: Cleaning gun, 18: Hand trick, 19: Flexible pipe, 20: Pressure switch, 21:
Upper limit setting section, 22: Lower limit setting section, A ₁ , A ₂ , A ₃ :
Units 1, 2, and 3 hot water supply equipment.

Claims (1)

[Scope of utility model registration request] A first water heater that always operates the pump without load and a second water heater that starts and stops the pump by opening and closing the hand cock are connected in parallel to the main pipe to which a large number of cleaning guns are connected via hand sockets. The first water heater is provided with a boiler, a pump that is connected to the water supply pipe of the boiler and operates under no load at all times, an unloader valve that is connected to the discharge side of the pump, and the unloader valve is connected to the main pipe. A discharge pipe and a return pipe connected to the water supply tank of the boiler are provided, and the second water supply device includes a boiler, a pump connected to the water supply pipe of the boiler, and a pump that is started and stopped by opening and closing a hand pot, and a discharge pipe of the pump. at least an unloader valve connected to the side, a discharge pipe connecting the unloader valve to the main pipe, a return pipe connecting the water supply tank of the boiler, and a pressure switch interposed in the discharge pipe for starting and stopping the pump. If there are multiple sets of the second water heater, the upper and lower set pressures of each pressure switch are made different so that the pumps start and stop sequentially depending on the number of cleaning guns used. Car washing equipment with multiple washing guns.