JPH0434471B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention uses high-pressure jetting of high-temperature water that is higher than the temperature limit for cavitation of high-pressure pumps and the heat resistance limit of packing to perform various types of hot water washing, sterilization, disinfection, and cleaning. Or it relates to a hot water washing device that performs cold water washing.

"Prior art" The prior art is, for example, patent application No. 59-57400 (Patent Publication No. 63
-55995). In this hot water washing device, a heating medium is placed in the combustion chamber of the boiler, and one end of the medium is connected to the discharge side of the high-pressure pump, the other end is connected to the washing gun via a high-pressure hose, and the other end is connected to the hot water storage chamber of the boiler. They were connected via installed piping, and a pair of on-off valves installed in the hot water storage chamber at different heights were connected to these piping, respectively. When the high-pressure pump is activated or stopped, this pair of on-off valves opens or closes due to the pressure difference that occurs in the piping system on the discharge side of the high-pressure pump, and accordingly, the heating medium and the hot water storage chamber of the boiler are connected or closed. It acted as a blocker.

Moreover, this hot water washing device operated as follows. In other words, when not cleaning, close the cleaning gun, turn off the pump switch, and turn on the burner switch.
When the water is supplied to the boiler in advance,
In addition to being heated in the hot water storage chamber of the boiler, heating is also applied from the bottom of the hot water storage chamber through the heating medium to the top of the hot water storage chamber through a pair of opened on-off valves, and the temperature reaches a predetermined temperature (high-pressure pump cavitation) in a short time. Approximately at temperatures below the heat resistance limit of occurrence and packing
Hot water (85 degrees C) was stored in the hot water storage chamber of the boiler. In addition, when cleaning, when the cleaning gun is opened and the pump switch is turned on, the hot water stored in the hot water storage chamber is sucked and pressurized by the high-pressure pump and is forced into the heating medium, and a pair of on-off valves are activated. The increased pressure in the heating medium closes the boiler, cutting off the heating medium and the hot water storage chamber of the boiler, so hot water passes through the heating medium and is injected at high pressure from the washing gun.
A temperature sensor detects the temperature drop in the hot water storage chamber due to water supply, and the boiler's combustion device is activated through the control of the temperature controller, so as the water passes through the heating medium, additional heating is added and the high temperature is increased. Spit out.

``Problems to be Solved by the Invention'' As mentioned above, the conventional device sucks and pressurizes hot water at a predetermined temperature in the hot water storage chamber of the boiler using a high-pressure pump, and also pumps hot water into the heating medium disposed in the combustion chamber of the boiler. By applying pressure to the heating medium, high-temperature, high-pressure hot water washing was made possible by avoiding the cavitation of high-pressure pumps and the heat resistance limits of packing. There was a problem that piping connection work increased costs. The present invention provides a hot water washing device that can inject high-temperature hot water at high pressure without being affected by the decrease in pump efficiency due to cavitation of the high-pressure pump and the heat resistance limit of packing, and also aims to solve the above problems. purpose.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides a high-pressure pump that is connected to the boiler and the hot water storage chamber of the boiler in the machine frame. A hot water cleaning device that performs cleaning by spraying hot or cold water from a cleaning gun connected to a high-pressure hose through an installed discharge port, which is installed in the combustion chamber of a boiler, and
One end of the heating medium is connected to the discharge side of the high-pressure pump, and the other end is connected to the discharge port through the can wall of the boiler, and also to the discharge port and the hot water storage chamber of the boiler. It is equipped with an unloader valve whose connection port and return port are connected to piping, and a high-pressure pump that can
It is wired so that it is linked to the combustion device of the boiler through the control of the temperature regulator.

``Operation'' When not cleaning, close the cleaning gun in advance, turn off the cleaning switch, turn on the combustion switch, supply water to the hot water storage chamber of the boiler, and when the water level reaches a predetermined level, control the temperature controller. The combustion device of the boiler and the high-pressure pump are interlocked via the boiler. The water in the hot water storage chamber of the boiler is sucked in by the high-pressure pump, pressurized, and sent to the heating medium, resulting in a high pressure in the piping system on the discharge side of the high-pressure pump, which exceeds the preset operating pressure of the unloader valve. When this happens, the unloader valve opens, hot water flows from the unloader valve to the hot water storage chamber via the return pipe connected to the hot water storage chamber, and the high pressure pump goes into low pressure operation. In addition, the water in the hot water storage room is heated in the boiler, and is also efficiently heated by circulating through the high-pressure pump, heating medium, and unloader valve, so it reaches the set temperature in a short time and controls the temperature controller. As a result, the operation of the combustion device and the high-pressure pump is stopped, and hot water maintained at a predetermined temperature is stored in the hot water storage chamber. In addition, during washing, when the washing switch is turned on and the washing gun is opened, the unloader valve closes and the hot water in the hot water storage chamber, which has been maintained at a predetermined temperature, is sucked in and pressurized by the high-pressure pump and becomes the heating medium. At the same time, the temperature sensor detects the temperature drop in the hot water storage chamber due to the water supply, and the combustion device is activated through the control of the temperature regulator, so that heat is further exchanged as it passes through the heating medium. , high-pressure water is injected from the nozzle of the cleaning gun as high-temperature water that exceeds the temperature limit of cavitation of the high-pressure pump and the heat resistance limit of the packing.

"Embodiment" An embodiment of the present invention will be described with reference to FIG.
1 is a machine frame, and the boiler 2 forms a hot water storage chamber 6 with an outer wall 4 and an inner wall 5. A combustion device 8 and an exhaust stack 9 are connected to the combustion chamber 7 . One end of the heating medium 10, which is wound around a heating pipe having an appropriate material and shape and arranged in the combustion chamber 7, is connected to the hot water storage chamber 6.
A suction pipe 11 is connected to a discharge pipe 12 of the high-pressure pump 3, and the other end is connected to a liquid sending pipe 16 connected to a discharge port 15 provided in the machine frame 1. Further, the connection port and return port of the unloader valve 14 are connected to the liquid sending pipe 16 and the return pipe 13. Additionally, a ball valve 17 is installed at the top of the boiler 2 to control the water level in the hot water storage chamber 6.
and a hand-washing outlet 18 are provided, which are connected via piping to a water supply port 19 and a hand-washing stop valve 20 provided in the machine frame 1, respectively. Further, a temperature sensor 21 disposed in the hot water storage chamber 6 is connected by wire to a temperature regulator 22 disposed in a panel portion of the machine frame 1. The combustion device 8 includes a temperature controller 22, a dry firing prevention device disposed at a predetermined position in the hot water storage chamber 6, an overheat prevention device disposed at a predetermined position in the boiler, and a combustion device 8 disposed near the combustion device 8. The burner control relays (none of which are shown) are wired to a power source together with a combustion switch 23 disposed on a panel of the machine frame 1 through respective control contacts. The cleaning switch 24 interlocks with the combustion device 8 an excitation coil (not shown) of an electromagnetic switch that turns on and off the power to the motor (not shown) that drives the high-pressure pump 3 when it is OFF, and operates independently when it is ON. It is wired to the power supply so that it is connected to the power supply. A cleaning gun 27 having a nozzle 25 and a stop gun mechanism 26 is connected to a high pressure hose 28.
It is connected to the discharge port 15 via piping.

Next, the operation of the embodiment will be explained. When not cleaning, close the stop gun mechanism 26 of the cleaning gun 27 and turn the cleaning switch 24.
At the same time as turning off the combustion switch 23.
Set to ON. Water is supplied to the hot water storage chamber 6 of the boiler 2 by connecting the water supply port 19 to a water source, and when the water level reaches a predetermined level at which a dry firing prevention device is installed, the boiler 2 is started to burn through the control of the temperature controller 22. Device 8 and high pressure pump 3 are activated. The water in the hot water storage chamber 6 is heated by the combustion device 8, and is also sucked into the high-pressure pump 3 via the suction pipe 11, pressurized, and then transferred to the heating medium 10 disposed in the combustion chamber 7 via the discharge pipe 12. The heating medium 10, the liquid feeding pipe 16, and the unloader valve 1 are pumped from the discharge pipe 12 connected to the discharge side of the high-pressure pump 3.
4, and a stop gun mechanism 2 disposed on the cleaning gun 27 via the discharge port 15 and a high pressure hose 28.
The piping system leading to No. 6 becomes under high pressure. When the pressure inside this pipe exceeds the preset operating pressure of the unloader valve 14, the unloader valve 14 opens, and the water flow discharged from the high-pressure pump 3 is transferred from the unloader valve 14 to the return pipe 13 connected to the hot water storage chamber 6. The hot water flows into the hot water storage chamber 6 through the hot water storage chamber 6, and the high pressure pump 3 enters a low pressure operation regulated by an orifice (not shown) built into the unloader valve 14.
The water in the hot water storage chamber 6 circulates through the suction pipe 11, the high-pressure pump 3, the heating medium 10, the unloader valve 14, and the return pipe 13, and as it passes through the heating medium 10, efficient heat exchange is performed and the water is heated for a short time. is heated to a predetermined temperature. Then, the operation of the combustion device 8 and the high-pressure pump 3 is stopped under the control of the temperature regulator 22, and therefore, the hot water stored in the hot water storage chamber 6 is maintained at a predetermined temperature through the control of the temperature regulator 22. be done. During cleaning, when the cleaning switch 24 is turned on and the stop gun mechanism 26 of the cleaning gun 27 is opened, the pressure in the piping system connected to the discharge side of the high-pressure pump 3 falls below the low pressure regulated by the orifice. When the temperature drops, the unloader valve 14 closes, and the hot water, which has been previously heated to a predetermined temperature and stored in the hot water storage chamber 6, is sucked and pressurized by the high-pressure pump 3, is fed into the heating medium 10, and is then pumped at high pressure from the washing gun 27. At the same time, a temperature sensor 2 detects a drop in the temperature of hot water in the hot water storage chamber 6 as water is supplied.
1, and the combustion device 8 is operated through the control of the temperature regulator 22, so that efficient heat exchange is performed when the heating medium 10 passes through, and the cavitation of the high-pressure pump 3 is further heated. Hot water at a temperature higher than the heat resistance limit for generation and packing is jetted at high pressure from the nozzle 25 of the cleaning gun 27. Also, if necessary, turn on the combustion switch 23.
If you turn it off, you can wash it with cold water. In addition, the hot water from the boiler 2 can be used for hand washing etc. with the stop valve 20 for hand washing. Note that the temperature of the hot water injected from the washing gun 27 may be controlled by not only setting the temperature of the temperature regulator 22 but also adjusting the amount of water sent from the high-pressure pump 3 to the heating medium 10 by bypassing or the like.
Further, the boiler 2 may have a hot water tank connected thereto.

"Effects of the Invention" The present invention provides a piping connection between a heating medium disposed in the combustion chamber of a boiler having a hot water storage chamber, and a discharge port connected to the discharge side of a high-pressure pump and a washing gun via a high-pressure hose. As a result, high-temperature hot water can be injected at high pressure without being affected by the decrease in pump efficiency due to cavitation of the high-pressure pump or the heat resistance limit of the pump packing, making it highly effective for various types of hot water cleaning and sterilization and disinfection cleaning. . In addition, by installing an unloader valve together with the heating medium on the discharge side of the high-pressure pump, it is possible to prevent the heating medium from overheating and dry firing, and it is also possible to switch the flow of hot water during washing and non-washing. Since this is done by opening and closing the unloader valve, there is no need to process the opening/closing valve, etc., and the piping connection work is simple, resulting in significant cost reductions and improved reliability. have
In addition, in winter, if you set the temperature controller to a low temperature that does not allow the water to freeze, and turn off the cleaning switch and turn on the combustion switch, you can prevent freezing inside the boiler and keep the boiler cool. No need to drain water.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of one embodiment of the present invention. 1... Machine frame, 2... Boiler, 3... High pressure pump, 6... Hot water storage chamber, 7... Combustion chamber, 8... Combustion device, 10... Heating medium, 11... Suction piping, 12
...Discharge piping, 13...Return piping, 14...Unloader valve, 15...Discharge port, 16...Liquid feeding pipe, 21...Temperature sensor, 22...Temperature controller,
23... Combustion switch, 24... Cleaning switch,
25... Nozzle, 26... Stop gun mechanism, 2
7...Washing gun, 28...High pressure hose.

Claims (1)

[Claims] 1 A boiler and a high-pressure pump connected to the hot water storage chamber of the boiler are installed in the machine frame, and hot or cold water is supplied from a washing gun connected to a high-pressure hose through a discharge port installed in the machine frame. In a hot water washing device that performs washing by spraying hot water, the boiler is installed in the combustion chamber of the boiler, and one end is connected to the discharge side of the high-pressure pump, and the other end is connected to the discharge port of the boiler. The heating medium is connected by piping through the heating medium, and the unloader valve has a connection port and a return port connected to the other end of the heating medium and the hot water storage chamber of the boiler, respectively. 1. A hot water washing device characterized in that the hot water washing device is wire-connected to operate in conjunction with a combustion device of a boiler through control of a temperature regulator during washing.