JPH0634975B2 - Hot water washer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is capable of heating to a predetermined temperature even during non-cleaning when the supply of water from the water supply source to the boiler is stopped by stopping the operation of the high-pressure pump. A hot water washer that heats the stored water in the hot water storage room to a predetermined temperature by operating a boiler for the purpose of immediate supply of hot water and multipurpose use of hot water such as general hot water, and at the time of washing, By sending hot water heated to a predetermined temperature in the boiler's hot water storage chamber to the cleaning gun by reheating it through a heating medium such as a heating coil installed in the boiler's combustion chamber instead of sending it directly to the cleaning gun by a high-pressure pump. , A hot water washer that can discharge hot water at a temperature higher than the set temperature in the hot water storage room without the need to install a large calorie boiler combustion device and without being restricted by the heat resistance limit of the high pressure pump packing It is intended to.

And the present invention, in such a hot water washer,
In order to eliminate the risk of abnormal overheating of residual water in the heating medium, which is a concern during non-cleaning, when water is not supplied to the boiler and the water stored in the hot water chamber is heated by the boiler The present invention relates to a hot water washer designed to forcibly circulate hot water between and.

[Conventional technology]

As described above, the boiler is operated even during non-cleaning to provide immediate supply of hot water of a predetermined temperature and multipurpose use of hot water, and a heating medium for reheating hot water is provided in the combustion chamber of the boiler to store hot water from the cleaning gun. As a conventional hot water washing machine capable of discharging hot water having a temperature higher than a set temperature indoors, there is a hot water washing device disclosed in Japanese Patent Publication No. 63-55995 developed by the present inventor.

This hot water washing device is provided with a heating medium such as a heating coil, which has one end connected to the discharge side of a high-pressure pump and the other end connected to a cleaning gun, in the combustion chamber of the boiler, and at least one pair of the heating media is connected. A hot water storage chamber of the boiler is connected via a section, and an on-off valve that opens and closes according to the operating state of the high-pressure pump is arranged at the pair of connection sections.

This hot water cleaning device is accompanied by no discharge pressure of the high pressure pump during non-cleaning in which the water supply to the boiler is cut off by the operation stop of the high pressure pump and the stored water in the hot water storage chamber is heated by the boiler. By connecting the hot water storage chamber and the heating medium through the opening of the on-off valve, by utilizing the natural convection of hot water in the hot water storage chamber to circulate the hot water between the hot water storage chamber and the heating medium, This is to avoid the risk that the residual water in the heating medium is overheated abnormally.

[Problems to be solved by the invention]

However, this conventional hot water cleaning device circulates the hot water by natural convection between the hot water storage chamber and the heating medium, thereby avoiding the risk of abnormal overheating of the residual water in the heating medium during the non-cleaning. However, depending on the structure of the heating medium, there is a possibility that the danger cannot be completely eliminated.

For example, when a heating coil in which a small-diameter pipe is spirally wound multiple times is used as the heating medium, the circulation speed of hot water due to natural convection is slow and the pipe resistance in the coil is added, so that the coil Depending on the number of winding turns, the temperature rise in the coil per unit time becomes large, and therefore there is a risk of overheating even when hot water is circulating.

In view of such circumstances, the present invention is intended to further improve the conventional device, and when the above-mentioned non-cleaning is performed regardless of the structure of the heating medium such as the case of using the above-mentioned multi-winding heating coil as the heating medium. In the hot water washing machine, there is no danger of abnormal heating associated with heating the residual water in the heating medium, and the heat exchange efficiency of the hot water in the hot water storage chamber at that time can be further enhanced. It is intended to provide.

[Means for Solving the Problems]

Therefore, in order to achieve the above object, the present invention provides a non-cleaning state in which the supply of water into the boiler is interrupted by the operation stop of the high-pressure pump and the stored water in the hot water storage chamber is heated by the operation of the boiler. , By constantly circulating hot water between the hot water storage chamber and the heating medium via a high-pressure pump, there is no risk of abnormal overheating associated with heating the residual water in the heating medium. It is what you have done.

That is, as the basic structure of the hot water washing machine, the boiler has a boiler having a hot water storage chamber connected to a water supply source such as tap water in a can, a high-pressure pump having a suction side connected to the hot water storage chamber of the boiler, and a boiler. Is equipped with a heating medium such as a heating coil, which is disposed in the combustion chamber at one end of the high-pressure pump on the discharge side and the other end is connected to the cleaning gun by pipes, respectively, and the boiler and the high-pressure pump operate independently. A switching valve is provided in the pipe connecting the other end of the heating medium and the cleaning gun, and one end of the pipe is connected to the circulation pipe to connect to the hot water storage chamber. A switching valve that is controlled by appropriate means so that it is closed when the high-pressure pump is operated and opened when the operation is stopped, and when the boiler is not in operation and is not being washed,
An electromagnetic switch for the pump motor was connected in parallel with the boiler operation circuit between the boiler operation switch and the power supply in order to forcibly circulate hot water between the hot water storage chamber and the heating medium via the high-pressure pump and the switching valve. It is characterized by.

The piping configuration for forcibly circulating hot water between the hot water storage chamber and the heating medium may be other than the above-mentioned basic configuration. For example, the other end of the heating medium may be a cleaning gun equipped with a stop gun mechanism. There is also a case where a configuration is used in which a pipe connection is made, and an opening / closing valve or an electromagnetic valve for switching connection between the other end of the heating medium and the hot water storage chamber is connected as a switching valve between the connection pipe and the hot water storage chamber.

Further, the switching operation of the switching valve for switching the connection between the other end of the heating medium and the washing gun or the hot water storage chamber may be performed by an appropriate means. For example, an electromagnetic solenoid and a switching valve may be used as the switching valve. An electromagnetic solenoid of the switching valve is connected between the pump operating switch and the power source in parallel with the pump operating circuit, and the switching valve is opened and closed automatically by turning on and off the operating switch of the high-pressure pump. Do like this.

Furthermore, the operation of the high-pressure pump for forcibly circulating hot water between the hot water storage chamber and the heating medium is such that the hot water between the hot water storage chamber and the heating medium is passed between the hot water storage chamber and the heating medium via the high-pressure pump and the switching valve when the boiler is in the non-cleaning state. As described above, connect the pump motor electromagnetic switch in parallel with the boiler operation circuit and connect the boiler operation switch via the boiler operation switch so that forced circulation is automatically and reliably performed. I will be taught.

Furthermore, when a cleaning gun equipped with a stop gun mechanism is used as described above, the stop gun mechanism of the cleaning gun is temporarily closed during cleaning to stop the discharge of cleaning water from the high-pressure pump. At this time, the hot water circulates between the suction side and the discharge side of the high-pressure pump by the operation of the unloader valve of the high-pressure pump, and the discharge of the hot water from the high-pressure pump is stopped in the heating medium, and the hot water remains in the heating medium. Hot water may be heated. But in this case,
The contact of the limit switch is normally closed between the operation switch of the boiler and the control circuit of the boiler unit, and the limit switch lever is placed close to the unloader valve of the high-pressure pump to open the unloader valve. Along with this, the lever of the limit switch is pushed so that the contact is opened, and the operation of the boiler is temporarily stopped, thereby countering the danger.

[Operation] Since the present invention is configured as described above, it has the following effects.

First, at the time of cleaning, the other end (outlet side) of the heating medium is connected to the cleaning gun side through the switching valve.
Cut off from the hot water storage room side. When hot water in the hot water storage chamber of the boiler is inhaled by the operation of the high-pressure pump, water is automatically supplied from the water supply source to the hot water storage chamber, and the water introduced into the hot water storage chamber is heated to a preset temperature in sequence by the operation of the boiler. To be done. Then, the hot water heated to a predetermined temperature in the hot water storage chamber is pressurized by the high-pressure pump and discharged from the discharge side to the heating medium arranged in the combustion chamber of the boiler, and reheated in the heating medium to wash the gun. Sent to. Therefore, hot water of a high temperature equal to or higher than the set temperature in the hot water storage chamber (for example, a high temperature exceeding the heat resistance limit of the packing of the high-pressure pump) is jetted from the washing gun.

Since the boiler can be operated in advance (before cleaning work), at least hot water of a preset temperature is immediately jetted from the cleaning gun during cleaning work.

Next, at the time of non-cleaning, the other end portion (outlet side) of the heating medium is connected to the hot water storage chamber side through the switching valve,
Cut off from the cleaning gun side. Since no hot water is discharged from the cleaning gun, the water supply to the hot water storage chamber is stopped and the stored water in the hot water storage chamber and the residual water in the heating medium are heated to a predetermined temperature by the operation of the boiler. However, in this case, the high-pressure pump is in the state of being automatically operated by turning on the boiler operation switch even if the operation by the operation operation via the pump operation switch is stopped,
The hot water in the hot water storage chamber is sucked into the high-pressure pump, discharged from the discharge side into the heating medium, and returns to the hot water storage chamber from the outlet side through the heating medium via the switching valve. That is, the hot water is forcedly circulated between the hot water storage chamber and the heating medium by the operation of the high-pressure pump. Therefore, even if there is no stagnation of hot water in the heating medium and the hot water storage operation of the boiler that heats the stored water in the hot water storage chamber (operation with the water supply stopped) is performed, only the residual water is heated in the heating medium. There is no danger, so there is no danger of danger due to abnormal overheating. At this time, the boiler is combustion controlled by the temperature controller, so it automatically stops when the temperature of the hot water in the hot water storage chamber reaches the set temperature, but the electromagnetic switch for the pump motor opens and closes the contacts of this temperature controller. Regardless of the above, since electricity is always supplied through the boiler operation switch, even if the boiler stops, the high pressure pump does not stop, and hot water is always forcedly circulated between the heating medium and the hot water storage chamber.

The above is the description of the operation based on the above-described basic configuration of the present invention, but in the case where a cleaning gun equipped with a stop gun mechanism is used and a piping configuration for forcibly circulating hot water by a switching valve and a high pressure pump is adopted Also in the above, the action and effect during washing and non-washing are basically the same as described above.

However, in this case, when the stop gun mechanism of the cleaning gun is temporarily closed during the cleaning work, in order to avoid an excessive load due to its back pressure being applied to the high pressure pump, The connected unloader valve opens, the hot water circulates between the suction side and the discharge side of the high-pressure pump, and the hot water is not discharged from the high-pressure pump into the heating medium. The residual hot water inside may be heated. But in this case,
For example, as described above, pressing the limit switch lever with the opening operation of the unloader valve of the high-pressure pump opens the limit switch contact that is interposed between the operation switch of the boiler and the control circuit of the burner unit to operate the boiler. The danger is avoided by temporarily and automatically stopping.

〔Example〕

Hereinafter, an embodiment of a hot water washing machine according to the present invention will be described with reference to the attached drawings.

FIG. 1 is a piping connection system diagram of this hot water washing machine. As shown in FIG. 1, this hot water washing machine is roughly classified into a boiler A,
A high pressure pump B, a heating medium C, and a cleaning gun D,
These are pipe-connected to each other.

The boiler A is a hot water storage type boiler in which a space between the can body 1 and the combustion chamber 2 serves as a hot water storage chamber 3. The hot water storage chamber 3 is supplied with water via a water supply pipe 4 and a float valve 5 serving as water supply control means. Is connected to a water supply source 6 such as a pipe, and its capacity is high depending on the purpose of washing and multipurpose use of hot water.
Is set to a large capacity that corresponds to the discharge amount of. The hot water storage chamber 3 has its upper side opened to the atmosphere through an opening around the exhaust pipe 7. A burner unit 8 includes a blower, a fuel injection nozzle, a spark plug, an ignition transformer, a burner control relay (not shown) and an electromagnetic pump P, a filter F, which are connected to the fuel injection nozzle by piping.
It is composed of a fuel tank T and the like. Numerals 9 and 10 are the detection parts of the temperature controller and the empty heating preventer, which are arranged in the hot water storage chamber 3, respectively. A heating pipe 11 having a large number of fins on the outer surface in the longitudinal direction is arranged obliquely on the upper side in the combustion chamber 2, and both ends of the heating pipe 11 communicate with the hot water storage chamber 3, which is the hot water in the hot water storage chamber 3. This is to improve the heat exchange efficiency of. Hot water storage room 3
A pipe 12 is led out from the above, and a hot water supply valve 14 for multipurpose use such as general hot water supply of hot water in the hot water storage chamber 3 is connected to the pipe 12 via a hot water supply hose 13.
Reference numeral 15 is a drain for draining water in the hot water storage chamber 3 and the heating medium C, and 16 is a cleaning can drain provided on the bottom surface of the can 1.

The high-pressure pump B has its suction side connected to the hot water storage chamber 3 of the boiler A via the pipe 12, and its discharge side connected to one end of a heating medium C described later via a pipe 17.
Further, the discharge side of the high-pressure pump B is connected with an unloader valve 18 which opens when an excessive load is applied due to back pressure when the stop gun of the washing gun is closed. , 20 are connected to the hot water storage chamber 3 and the pipe 12 connected to the suction side of the high-pressure pump B. A limit switch, which will be described later, is arranged in proximity to the unloader valve 18, and the limit switch lever is pushed along with the opening operation of the unloader valve 18, and the limit switch is normally closed in the boiler operation circuit. The switch contacts are designed to open.

As the heating medium C, a heating coil in which a small-diameter pipe is spirally wound in multiple turns is used, and is arranged in the combustion chamber 2 of the boiler A. One end of the heating medium C is connected to the discharge side of the high pressure pump B via the pipe 17 as described above,
The other end is connected to a cleaning gun D having a stop gun mechanism via a pipe 21 and a high pressure hose 22.

A switching valve 23 is connected to the pipe 21 that connects the other end of the heating medium C and the cleaning gun D, and the switching valve 23 is connected to the hot water storage chamber 3 via the pipe 24. The switching valve 23 includes a valve body 23a having a steel ball and a pressing rod that presses the steel ball by the elastic force of the spring, and an electromagnetic solenoid 23b that releases the pressing action of the pressing rod. The valve body 23a is opened by the elastic force and the other end of the heating medium C and the hot water storage chamber 3 are connected to each other via the pipes 21 and 24. During cleaning, the electromagnetic solenoid 23b is excited to press the steel ball against the pressing rod. The valve body 23a is released.
Is closed, and the connection between the other end of the heating medium C and the hot water storage chamber 3 is cut off.

FIG. 2 is a principle diagram of an electric control circuit of an operating mechanism for operating the boiler A, the high-pressure pump B, and the switching valve 23 of the hot water washing machine. This electric system is divided into a high-pressure pump system and a boiler system, respectively. Are independently connected to a three-phase 200 V AC power source, and the high-pressure pump B and the boiler A are independently operated via their respective operation switches. Reference numeral 25 denotes a pump operation switch, which is an interlocking switch for operating both the pump motor electromagnetic switch 26 and the electromagnetic solenoid 23b of the switching valve 23. That is, the electromagnetic solenoid 23b of the switching valve
Is connected in parallel with the pump motor electromagnetic switch 26 between the pump operating switch 25 and the power source, as shown in the figure. Reference numeral 27 denotes a boiler operation switch, which is an interlocking switch for operating both the burner unit (including a burner control relay and a temperature controller) and the pump motor electromagnetic switch 26. That is, the pump motor electromagnetic switch 26 is connected in parallel with the burner unit 8, which is a boiler operation circuit, between the boiler operation switch 27 and the power source, as shown in the figure. Boiler operation switch 27 and burner unit 8 are limit switches 28
The contact of this limit switch is opened by pressing the lever of the limit switch in accordance with the opening operation of the unloader valve 18 on the discharge side of the high-pressure pump B.

Next, the usage state of the hot water washing machine according to the above-mentioned embodiment will be described. The hot water storage chamber 3 is automatically supplied with water from a water supply source 6 by opening and closing a float valve 5 associated with a change in the water level in the hot water storage chamber 3 due to the operation of a high-pressure pump B and a washing gun D. The water level is always kept constant.

In the non-cleaning mode in which the cleaning water is not discharged from the cleaning gun D,
The pump operation switch 25 is off, and only the boiler operation switch 27 is on. Boiler control switch 2
When 7 is turned on, the burner unit 8 is energized via the contacts of the limit switch 28, the burner is operated via the banner control relay, and the burner is combustion-controlled by the temperature controller 9 so that the hot water in the hot water storage chamber 3 is removed. It is always maintained at the set temperature. On the other hand, when the boiler operation switch 27 is turned on, the electromagnetic switch 26 for the pump motor is energized to operate the high pressure pump B, and the hot water in the hot water storage chamber 3 is sucked into the high pressure pump 8 and discharged into the heating medium C from its discharge side. To be done. At this time, since the switching valve 23 is opened (the electromagnetic solenoid is turned off by turning off the pump operation switch), the other end of the heating medium C and the hot water storage chamber 3 are connected to each other, so that the high-pressure pump B discharges the heating medium C. The warm water is returned from the other end of the heating medium C into the hot water storage chamber 3 through the pipe 24 (at this time, the washing gun D is closed by the stop gun mechanism). Therefore, during non-cleaning, the hot water heated in the boiler A is forcibly circulated through the hot water storage chamber 3-high pressure pump B-heating medium C-switching valve 23-hot water storage chamber 3, and the hot water remains in the heating medium C. It is not stagnant and heated.

At the time of cleaning in which cleaning water is discharged from the cleaning gun D, the pump operation switch 25 is turned on and the stop gun mechanism of the cleaning gun D is opened. When the pump operation switch 25 is turned on, the electromagnetic switch 26 for the pump motor is energized to operate the high-pressure pump B, and the electromagnetic solenoid 23b is excited to close the switching valve 23, so that the other end of the heating medium C and the hot water storage chamber 3 are connected to each other. Will be disconnected. Therefore boiler A
The hot water in the hot water storage chamber 3 heated to a predetermined temperature is sucked into the high-pressure pump B and pressure-fed into the heating medium C.
It is reheated inside and sent to the washing gun D through the pipe 21 and the high-pressure hose 22 and jetted to the outside.

When the stop gun mechanism of the cleaning gun D is closed in the middle of the cleaning operation, the unloader valve 18 is opened in order to prevent the risk that the large back pressure is applied to the high pressure pump B, and hot water is supplied to the high pressure pump B via the unloader valve 18. It circulates between the suction port and the discharge port of. Therefore, there is a possibility that the heating medium C is heated without running hot water, but in this case, the limit switch 2 is opened with the opening operation of the unloader valve 18.
Since the lever of No. 8 is pushed to open its contact in the boiler operation circuit, the electricity to the burner unit 8 is cut off, the burner is temporarily stopped, and there is no danger of heating the residual hot water in the heating medium C. When the interrupted work is started and the stop gun mechanism of the washing gun is opened again, the pressure in the pipe drops below the set pressure, the unloader valve 18 closes, and the contact of the limit switch 28 also closes accordingly, and the boiler operation resumes. To be done.

When the boiler operation switch 27 is turned off and only the pump operation switch 25 is turned on, the switching valve 2
Since 3 is closed and the connection between the heating medium C and the hot water storage chamber 3 is cut off, by opening the stop gun mechanism of the cleaning gun D, cold water is sprayed from the cleaning gun D.

The switching valve 23 connects the heating medium C and the hot water storage chamber 3 during non-cleaning, that is, when the operation of the high-pressure pump is stopped, and shuts off the connection immediately after cleaning, that is, during the operation of the high-pressure pump. The operating method is not limited to that shown in the above embodiment, and other methods may be used. Further, the cleaning gun D does not have to be limited to one having a stop gun mechanism.

〔The invention's effect〕

Since the present invention has the above-mentioned configuration, it solves the above-mentioned problems of the conventional technology and has the following effects.

a. The high-pressure pump is automatically operated through the operation of the boiler operation switch regardless of the combustion control of the boiler by the temperature controller during non-cleaning when the water supply to the boiler is cut off and the stored water in the hot water storage chamber is heated by the boiler. The hot water in the hot water storage chamber was forcedly circulated between the hot water storage chamber and the heating medium through the switching operation of the high pressure pump and the switching valve. Even when its operation is stopped, the operation of the high-pressure pump is not stopped and the forced circulation is always continued. Therefore, unlike the conventional case, there is a risk of abnormal heating of residual water in the heating medium, which is a concern during non-cleaning. Can be eliminated.

Therefore, unlike the conventional method, it is possible to effectively and surely utilize the reheating of hot water by a heating medium such as a heating coil arranged in the combustion chamber of the boiler, and accordingly, it is not necessary to install a boiler combustion device for calorie It is possible to safely discharge hot water that exceeds the heat-resistant limit of the pump packing, and it is possible to expand the range of cleaning work and improve work efficiency.

b. With a large-capacity hot water storage type boiler that responds to the discharge capacity of the high-pressure pump, the boiler can be safely operated independently by combustion control via a temperature controller during non-cleaning when the water supply to the boiler is cut off. Since the hot water in the hot water storage chamber can be discharged at a water supply pressure such as tap water, it is possible to immediately supply hot water of a desired temperature and amount.
Multipurpose use such as general hot water supply of hot water in the hot water storage chamber can be effectively achieved.

c. By reasonably utilizing the reheating action of hot water by the heating medium such as the heating coil installed in the combustion chamber of the boiler, washing with hot water and steam with one washing machine (adjustment of the amount of water flowing into the heating medium) Etc.) can be used properly. As a matter of course, cold water can be injected by stopping the operation of the boiler.

d. Using a cleaning gun equipped with a stop gun mechanism, when this stop gun mechanism is closed, the lever of the limit switch is pushed with the opening operation of the unloader valve of the high-pressure pump to open its contact and shut off the power to the burner unit. Since the burner is automatically stopped, the risk of abnormal overheating of the residual water in the heating medium, which is a concern in such a case, can be avoided.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a piping system diagram of a washing machine, Fig. 2 is a principle diagram of an operating mechanism of a high-pressure pump and a boiler, and Fig. 3 is each constituent member when not washing. And FIG. 4 is an operation explanatory view of the same in a state in which the stop gun mechanism of the cleaning gun is opened during cleaning, FIG.
The figure is an explanatory view of the same operation as above when the stop gun mechanism of the cleaning gun is closed during cleaning. A ... Boiler, B ... High-pressure pump C ... Heating medium, D ... Washing gun 1 ... Boiler can body, 2 ... Combustion chamber, 3 ... Hot water storage chamber, 4 ... Water supply pipe, 5 ... Float valve, 6 ... Water supply source such as water supply 8 ... Burner unit, 17, 21 ... Piping 18 ... Unloader valve, 22 ... High pressure hose 23 ... Switching valve, 23a ... Valve body 23b ... Electromagnetic solenoid, 24 ... … Piping 25 …… Pump operation switch, 26 …… Pump motor electromagnetic switch 27 …… Boiler operation switch 28 …… Limit switch

Claims (4)

[Claims] 1. A boiler having a hot water storage chamber connected to a water supply source such as tap water in a can body, a high-pressure pump having a suction side connected to the hot water storage chamber of the boiler by piping, and a boiler disposed at a combustion chamber of the boiler at one end thereof. In a hot water washer in which a boiler and a high-pressure pump are operated independently, the heating medium is provided on the discharge side of the high-pressure pump, and the other end is provided with a heating medium such as a heating coil that is connected to the washing gun by piping. Connect the circulation pipe, one end of which connects to the hot water storage chamber, to the pipe connecting the other end of the high pressure pump to the washing gun, and to close the pipe for circulation when the high-pressure pump is in operation and to open it when the operation is stopped. In addition to interposing a switching valve controlled by appropriate means,
In order to forcibly circulate hot water between the hot water storage chamber and the heating medium via the high-pressure pump and the switching valve during non-cleaning when the boiler is in operation, an electromagnetic switch for the pump motor is installed between the boiler operation switch and the power supply. A hot water washer characterized by being connected in parallel with the boiler operation circuit. 2. An opening / closing valve or an electromagnetic valve is used as a switching valve interposed in a circulation pipe connecting the other end of the heating medium and the hot water storage chamber. The warm water washer described. 3. A switching valve control means comprising an electromagnetic solenoid of a switching valve connected in parallel with a pump operating circuit between a pump operating switch and a power source. Item 1 or 2
The warm water washing machine as described in the item. 4. A boiler having a hot water storage chamber connected to a water supply source such as tap water in a can body, and a suction side is connected to the hot water storage chamber of the boiler by piping, and an unloader valve is provided in a circulation path between the suction side and the discharge side. And a heating medium, such as a heating coil, which is disposed in the combustion chamber of the boiler and has one end on the discharge side of the high pressure pump and the other end pipe-connected to a cleaning gun having a stop gun mechanism. In a hot water washing machine in which the boiler and the high-pressure pump are independently operated, a pipe for connecting the other end of the heating medium and the washing gun is connected to a pipe for circulation whose one end is connected to the hot water storage chamber. , A switching valve that is controlled and controlled by appropriate means so that it is closed when the high-pressure pump is in operation and opened when the high-pressure pump is in operation, and the high-pressure pump is in operation when the boiler is not in operation. In order to forcibly circulate hot water between the hot water storage chamber and the heating medium via the replacement valve, an electromagnetic switch for the pump motor should be connected in parallel to the boiler operation circuit between the boiler operation switch and the power supply, and the boiler operation should be performed. The limit switch contact was connected to the circuit in a normally closed state, and the limit switch lever was placed close to the high pressure pump unloader valve in order to open this limit switch contact along with the opening operation of the high pressure pump unloader valve. Characteristic hot water washing machine.