JP2008136925A - Cleaning machine using hot water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning machine using hot water capable of preventing destruction of its boiler can or the like caused by a pressure drop caused by a decrease in water supply during a cleaning work or by unexpected suspension of water supply to its closed type boiler. <P>SOLUTION: The cleaning machine using hot water comprised of a closed type boiler 2 directly connected to a city water faucet 1 for heating city water W supplied therefrom, a high pressure pump 3 in communication with the boiler 2 via a water suction pipe 7 for pressurizing and transferring hot water Wí heated by the boiler 2, a motor 8 for driving the high pressure pump 3, and a cleaning gun 4 in communication with the high pressure pump 3 via a high pressure hose 10 for ejecting the hot water Wí pressurized and transferred thereto by the high pressure pump 3 is further equipped with an air suction valve 12 having a check valve structure divergingly connected to a hot water outlet port 13b of the boiler 2 or to the water suction pipe 7 for preventing a pressure drop in the boiler 2 by sucking atmospheric air thereinto whenever the pressure therein begins to drop, and an air vent valve 9 attached to the high pressure pump 3 for venting air therein whenever the high pressure pump 3 sucks air A thereinto including at a time of its start up. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of a hot water washing machine used for washing automobiles, construction machines, agricultural machines, air conditioning equipment, kitchens, toilets, livestock facilities, ships, etc., in particular, in a closed boiler directly connected to a water tap. The present invention relates to an improvement of a hot water washer connected directly to a tap water in which tap water is heated and hot water obtained by a boiler is pressurized by a high-pressure pump and jetted from a washing gun.

Conventionally, as a hot water washing machine in which hot water obtained in a boiler is pressurized by a high pressure pump and sprayed from a washing gun, for example, a hot water washing apparatus disclosed in Japanese Utility Model Publication No. 5-85482 (Patent Document 1) is used. Are known.
That is, the hot water cleaning device is not shown, but the hot water device (boiler) that stores the cleaning water supplied by the water supply hose and heats it to a predetermined temperature, and the high pressure pump that pumps the hot water obtained by the hot water device A motor that drives the high-pressure pump, a cleaning gun with a hand opening / closing valve that injects hot water pumped by the high-pressure pump, and a hand-operated opening / closing of the cleaning gun when the high-pressure pump is driven. And an unloader valve that recirculates the hot water on the discharge side of the high-pressure pump to the hot water device when the valve is closed. Is sprayed at a high pressure, so that automobiles, construction machinery, agricultural machinery and the like can be washed.
Since this hot water washer can inject hot water at a high pressure, it is possible to improve the cleaning ability.

  By the way, in the hot water washing machine mentioned above, when the boiler can body of a hot water apparatus (boiler) is formed in a closed type and the water supply hose is directly connected to a water tap, the water supply amount is lowered or unexpected. If hot water continues to be sprayed from the washing gun while the water tap is stopped due to the situation of the above, the boiler can body of the hot water device is decompressed by the suction action of the high pressure pump, and the boiler can body becomes dented, and the hot water device itself There was a problem of damage.

In order to solve this problem, a cis-turn tank (not shown) having a float valve is connected to a hot water device (boiler), and tap water stored in the cis-turn tank is supplied to the hot water device or reduced in pressure to the hot water device. An alarm device (not shown) may be attached.
However, in the former case, the hot water washing machine itself cannot be compactly compact because of the installation of the cistern tank, and another problem arises that the hot water washing machine itself is complicated and expensive. In the latter case, since the pressure reducing alarm device itself is expensive, there arises a problem that the price of the hot water washing machine itself is increased.
Japanese Utility Model Publication No. 5-85482

  The present invention has been made in view of such problems, and its purpose is to reduce the amount of water supply during the cleaning operation, or even if water supply to the closed boiler is stopped due to an unexpected situation, It is an object of the present invention to provide a hot water washing machine directly connected to a water supply that can prevent the destruction of a boiler can or the like due to decompression.

  In order to achieve the above object, the invention of claim 1 of the present invention is a sealed boiler that is directly connected to a water tap via a water supply hose, stores the tap water supplied from the water tap, and heats it to a predetermined water temperature. And a high-pressure pump connected to the boiler via a water absorption pipe and pumping hot water heated by the boiler, a motor driving the high-pressure pump, and connected to the high-pressure pump via a high-pressure hose and pumped by the high-pressure pump. In a hot water washer connected directly to a water supply with a washing gun with an open / close valve that injects hot water, the boiler's interior is depressurized at the boiler's hot water outlet or water intake pipe due to a decrease in the amount of water supply or stoppage of the water supply. The air intake valve with a check valve structure that sucks air in the atmosphere to prevent pressure reduction in the boiler is connected in a branched manner, and the high pressure pump is connected to the high pressure pump when the high pressure pump is started or When inhaling It is characterized by providing the air vent valve for performing air bleeding in the high-pressure pump.

  The invention of claim 2 of the present invention is characterized in that a water supply hose connecting a water tap and a boiler is provided with a sewage backflow prevention valve with a strainer for preventing impurities and sewage from flowing back into the water pipe. .

The hot water washer of the present invention is connected to a hot water outlet of a hermetic boiler directly connected to a water tap or a water intake pipe connected to a hot water outlet in a branched manner, and when the pressure inside the boiler is reduced, Since the intake valve is opened to suck in air from the atmosphere to prevent pressure reduction in the boiler, warm water is supplied from the cleaning gun when the water supply is reduced or the water tap is stopped due to unforeseen circumstances. Even if the boiler is continuously sprayed, the inside of the boiler can is not depressurized, and the boiler can be prevented from being damaged by the dent of the boiler can.
Further, the hot water washing machine of the present invention can be obtained by simply connecting the air suction valve having a simple check valve structure in a branched manner to the hot water outlet of the hermetic boiler or the water suction pipe connected to the hot water outlet. Since the dent of the can body can be prevented, it is possible to prevent the hot water washing machine itself from becoming large and complicated, or the cost from rising.
Furthermore, the hot water washer of the present invention is provided with an air vent valve in the high pressure pump so that the air in the high pressure pump is extracted by the air vent valve when the high pressure pump is started or when the high pressure pump sucks air. In addition to speeding up the start of the high-pressure pump, it is possible to prevent harmful effects caused by air contamination.
In addition, since the hot water washing machine of the present invention is provided with a sewage backflow prevention valve in the water supply hose connecting the water tap and the boiler, impurities and sewage can be prevented from flowing back into the water pipe.

  FIG. 1 shows a hot water washer connected directly to a tap water according to an embodiment of the present invention. The hot water washer is a tap water W (hereinafter referred to as water W) by a closed boiler 2 directly connected to a tap 1. The hot water W ′ obtained in the boiler 2 is pressurized by the high-pressure pump 3 and injected from the washing gun 4 at a high pressure, such as automobiles, construction machinery, agricultural machinery, air-conditioning equipment, kitchens, toilets, It is used for cleaning livestock facilities and ships.

  That is, as shown in FIG. 1, the hot water washer is directly connected to the water tap 1 via a water supply hose 5 and stores the water W supplied from the water tap 1 and heats it to a predetermined water temperature. A sewage backflow prevention valve 6 with a strainer 19 that is interposed in the boiler 2 and the water supply hose 5 and prevents the impurities and sewage from flowing back into the water pipe (not shown), and the boiler 2 through the water suction pipe 7. The high pressure pump 3 that pumps the hot water W ′ heated by the boiler 2, the motor 8 that drives the high pressure pump 3, and the discharge side of the high pressure pump 3, and vents the air from the high pressure pump 3. An air vent valve 9, a washing gun 4 with an on-off valve (not shown) that is connected to the high pressure pump 3 via a high pressure hose 10 and injects hot water W ′ pumped from the high pressure pump 3, and discharge of the high pressure pump 3 Connected to the outlet 3b side, the high pressure pump 3 Branches to the unloader valve 11 for returning the hot water W ′ on the discharge side of the high-pressure pump 3 to the high-pressure pump 3 and the hot water outlet 13 b of the boiler 2 or the water intake pipe 7 when the opening / closing valve of the cleaning gun 4 is closed during driving. And an air intake valve 12 having a check valve structure that sucks air A in the atmosphere and prevents the pressure in the boiler 2 from being reduced when the pressure in the boiler 2 is reduced during the cleaning operation. It is mounted on a transport carriage (not shown) whose back, left, right, and top surfaces are covered with a front cover, a back cover, a left side cover, a right side cover, and a top cover, respectively, and is portable for convenient transportation and movement. It is configured as a hot water washer.

As shown in FIG. 1, the boiler 2 has a water inlet 13a and a hot water outlet 13b, a closed boiler can body 13 forming a water chamber, a combustion chamber 14 formed in the boiler can body 13, and a lower end. A plurality of heat transfer tubes 15 connected to the combustion chamber 14 and connected to a combustion gas outlet 13 c formed on the upper surface of the boiler can body 13. The burner 16 is arranged, a fuel tank 17 for storing fuel, a fuel pump 18 for supplying fuel to the burner 16, and a control unit 19 for controlling the burner 16, the fuel pump 18 and the like, When the burner switch 20 is turned on, the fuel pump 18 is operated to send fuel from the fuel tank 17 to the burner 16, and is ignited by an automatic ignition device (not shown) to heat the water W in the boiler can 13; , 'When the temperature reaches its set value thermoswitch 21 (temperature controller), the hot water W burner 16 is extinguished automatically' hot water W is adapted to maintain a predetermined temperature.
The boiler 2 is directly connected to the water tap 1 by a water supply hose 5 provided with a pressure reducing valve 22 with a filter and a sewage backflow prevention valve 6, and the water W from the water tap 1 is directly connected to the boiler can body by the water supply hose 5. 13 is supplied with water.

  In FIG. 1, 22 is connected to the upper part of the boiler can body 13, and is an on-off valve used when performing auxiliary washing or hand washing of unwashed washing accompanying the cleaning operation, and 23 is provided at the lower part of the boiler can body 13. The connected drain pipe, 24 is a drain cock interposed in the drain pipe 23, and 25 is an air blow prevention sensor.

As shown in FIG. 2, the sewage backflow prevention valve 6 includes a stepped cylindrical female body 26 having a linear flow passage S therein and having a step portion 26 a formed in the middle of the flow passage S. A cylindrical male having a straight flow path S ′ that is detachably screwed into one end (left end in FIG. 2) of the female body 26 and communicates with the flow path S of the female body 26 inside. Between the mold body 27, the stepped portion 26 a of the female mold body 26, and one end portion (the right end portion in FIG. 2) screwed into the female mold body 26 of the male mold body 27. A check valve unit 28 that allows the water W to flow in one direction and blocks the flow in the reverse direction, and a step between the one end face of the male body 27 and the check valve unit 28 or the female body 26. A disc-shaped mesh strainer 29 and an annular packing 30 interposed in close contact with each other between the portion 26a and the check valve unit 28. The other end of the female body 26 (the right end in FIG. 2) and the other end of the male body 27 (the left end in FIG. 2) are respectively connected via joints (not shown). It is connected to the water supply hose 5.
In the sewage backflow prevention valve 6 shown in FIG. 2, the male body 27 is on the upstream side and the female body 26 is on the downstream side.

Further, as shown in FIG. 2, the check valve unit 28 is formed into a trumpet-shaped cross section whose diameter gradually decreases from the upstream side (left side in FIG. 2) to the downstream side (right side in FIG. 2). A valve seat body 31 having a circular valve port 31a and an annular valve seat surface 31b, and a substantially rectangular shape that is disposed in close contact with the valve seat body 31 on the downstream side of the valve seat body 31 and through which water W passes. A cylindrical bowl-shaped valve guide body 32 having an opening 32b serving as a passage port 32a and an outlet for water, and a valve guide body 32 are provided so as to be able to move forward and backward, and contact the valve seat surface 31b of the valve seat body 31. A bottomed cylindrical valve body 33 that opens and closes the valve port 31 a of the valve seat body 31 is interposed between the valve guide body 32 and the valve body 33, and the valve body 33 is connected to the valve seat body 31. It comprises an elastic body 34 (compression coil spring) that urges the valve seat surface 31b so as to contact the valve seat surface 31b, and the valve seat body 31 and the valve guide body 32 are stray. 29 and is clamped fixed in an airtight manner at the one end portion of the stepped portion 26a and the male body 27 of the female body 26 together with the packing 30.
At this time, the upstream end of the valve seat body 31 of the check valve unit 4 is in close contact with the packing 30, and the downstream end of the valve guide body 32 of the check valve unit 28 is in close contact with the stepped portion 26 a of the female body 26. In addition, the sealing properties between the female body 26 and the check valve unit 28 and between the male body 27 and the check valve unit 28 are ensured.

Thus, according to the sewage backflow prevention valve 6, the valve body 33 resists the elastic force of the elastic body 34 when the pressure in the flow path S ′ of the male body 27 increases with water supply. The valve 31 is separated from the valve 31 and the valve port 31a of the valve seat body 31 is opened so that the upstream side and the downstream side pass water (see FIG. 2B). Then, the water W in the flow path S ′ of the male body 27 passes through the strainer 29 from the valve port 31 a of the valve seat body 31 through the annular gap between the valve seat body 31 and the valve body 33 and enters the valve guide body 32. Flow into. The water W that has flowed into the valve guide body 32 flows to the downstream side of the valve body 33 through the clearance between the valve body 33 and the valve guide body 32 and the passage port 32a of the valve guide body 32, and the valve guide body 32 is opened. It flows into the flow path S of the female body 26 from 32b.
Further, when the amount of water supply decreases and the pressure in the flow path S ′ of the male body 27 decreases, the valve body 33 is pressed toward the valve seat body 31 by the urging force of the elastic body 34, so that the valve seat body 31 is contacted. Then, the valve port 31a of the valve seat body 31 is closed (see FIG. 2A). Thereby, the reverse flow of the water W from the downstream side to the upstream side is prevented.

In the sewage backflow prevention valve 6, the gap between the stepped portion 26 a of the female body 26 and one end portion (the right end portion in FIG. 2) screwed into the female body 26 of the male body 27. Since the check valve unit 28 is disposed so as to be reversible, when it is desired to reverse the flow of water in the piping system for some reason, the female body 26 and the male body 27 are disassembled from the inside. The check valve unit 28, strainer 29, and packing 30 may be taken out, and the check valve unit 28, strainer 29, and packing 30 taken out may be reversed and assembled between the female body 26 and the male body 27. As a result, the sewage backflow prevention valve 6 does not need to remove the entire sewage backflow prevention valve 6 from the piping system and change the direction of the sewage backflow prevention valve 6 by 180 degrees, and easily changes the flow direction of the water W by a relatively simple operation. be able to.
Further, in this sewage backflow prevention valve 6, since a strainer 29 is disposed on the upstream side of the check valve unit 28, foreign matter such as dust contained in the water W is captured by the strainer 29. As a result, it is possible to prevent foreign matters such as dust from adhering to the valve seat body 31 and the like to deteriorate the sealing performance, and to prevent foreign matter from entering the boiler 2. However, since the upstream end of the valve seat 31 is brought into close contact with the annular packing 30, even if the net-like strainer 29 is provided, the sealing performance is not lowered.

The high-pressure pump 3 is connected to a power source 35 (DC power source) and linked to an output shaft of a motor 8 driven by a motor power switch 36. The water W driven by the motor 8 and sucked from the water inlet 3a. The high pressure water is discharged from the discharge port 3b.
The water inlet 3 a of the high pressure pump 3 is connected to the hot water outlet 13 b of the boiler 2 through the water intake pipe 7, and the outlet 3 b of the high pressure pump 3 is connected to the unloader valve 11 and the high pressure hose 10. It is connected to a cleaning gun 4 with an on-off valve.
In this embodiment, the high-pressure pump 3 includes, for example, a ceramic plunger pump having a discharge pressure of 3.5 MPa (35 kgf / cm ² ) and a discharge amount of 10 L / min (600 L / h). A ceramic plunger pump having a pressure of 10 MPa (100 kgf / cm ² ) and a discharge amount of 10 L / min (600 L / h) is used. The motor 8 includes a motor 8 with an output of 0.75 KW (when the high pressure pump 3 is the former ceramic plunger pump) and a motor 8 with an output of 2.2 KW (the high pressure pump 3 is the latter ceramic plunger pump). Is used).

  The air vent valve 9 is provided on the discharge side of the high-pressure pump 3. When the high-pressure pump 3 is started up or when the high-pressure pump 3 sucks air A, the air-bleed valve 9 is opened to release air from the high-pressure pump 3. In addition, after the air A is removed, the hot water W ′ in the high-pressure pump 3 is prevented from leaking due to the closed state.

  That is, as shown in FIG. 3, the air vent valve 9 is connected to the discharge side of the high-pressure pump 3 so as to communicate with the inside of the pump 3, and is arranged between the air A inlet 37a and the outlet 37b arranged in a straight line. A cylindrical body 37 comprising a female body 37 ′ and a male body 37 ″ in which a valve chamber 37 c is formed, an annular valve seat 38 disposed at a downstream position in the valve chamber 37 c of the body 37, and a body A ball-shaped valve body 39 which is freely accommodated in the valve chamber 37c of the 37 and opens and closes to the valve seat 38 to open and close the outlet side of the valve chamber 37c, and the outlet side of the male body 37 ″ of the body 37 When the valve body 39 is pushed to the valve seat 38 side by water pressure, a gap through which air A passes is formed between the valve body 39 and the valve seat 38 to support the valve body 39. A compression coil spring that shortens the valve body 39 against the valve seat 38. 40, when the high-pressure pump 3 is started up or when the high-pressure pump 3 sucks air A, the air A in the high-pressure pump 3 becomes a gap between the inlet 37a of the body 37, the valve chamber 37c, the valve seat 38 and the valve body 39. After the air 37 is discharged from the outlet 37b of the body 37 through the air discharge hose 41 and the air A in the high-pressure pump 3 is released, the valve body 39 is elastically applied to the compression spring 40 by water pressure. The valve is pressed against the valve seat 38 against the valve seat 38 to prevent the warm water W ′ from leaking from the air vent valve 9.

The cleaning gun 4 has an opening / closing valve (not shown) on the base end side and a nozzle 4a for injecting hot water W ′ on the tip end side. When the lever 4b on the base end side is pulled, the cleaning gun 4 opens and closes. When the valve is opened, high-pressure hot water W 'is injected from the nozzle 4a, and when the lever 4b is released, the on-off valve is closed and the injection from the nozzle 4a is stopped.
In this embodiment, the rotary nozzle 4a is used as the nozzle 4a of the cleaning gun 4 to improve the efficiency of hot water cleaning.

The unloader valve 11 is connected to the discharge port 3 b side of the high-pressure pump 3, opens according to the water pressure in the high-pressure hose 10, and uses the hot water W ′ to partially utilize the water-absorbing pipe 7. It is configured to return inward.
That is, when the opening / closing valve of the cleaning gun 4 is closed when the high pressure pump 3 is driven, the unloader valve 11 is pushed open as the pressure in the high pressure hose 10 rises, and the hot water W discharged from the discharge port 3b of the high pressure pump 3 is discharged. ′ Is returned to the high pressure pump 3 through the downstream portion of the water suction pipe 7, and when the opening / closing valve of the cleaning gun 4 is opened, the internal pressure in the unloader valve 11 is lowered and the unloader valve 11 is closed. The hot water W ′ discharged from the three discharge ports 3 b is supplied to the cleaning gun 4 through the high-pressure hose 10.

  The air intake valve 12 is connected to the hot water outlet 13b of the boiler 2 or the water intake pipe 7 in a branched manner. When the inside of the boiler 2 is depressurized due to a decrease in water supply amount or stoppage of water supply during the cleaning operation, The air A is sucked to prevent decompression in the boiler. As the air intake valve 12, an air intake valve 12 having a check valve structure is used.

That is, as shown in FIG. 4, the air intake valve 12 is connected to the hot water outlet 13b of the boiler 2 or the water intake pipe 7 in a branched manner, and is arranged in a straight line between the air A inlet 42a and the outlet 42b. A cylindrical body 42 composed of a female body 42 ′ and a male body 42 ″ having a valve chamber 42 d having a valve seat 42 c therebetween, and a valve chamber 42 d of the body 42 movably moved forward and backward. A shaft-shaped valve body 44 provided with a seal member 43 that opens and closes between the inlet 42a and the outlet 42b of the body 42 by being separated from the seat 42c, and is interposed between the male body 42 ″ and the valve body 44. And a compression coil spring 45 that urges the valve body 44 against the valve seat 42c to reduce the water supply amount or stop the water supply during the injection of the hot water W 'from the cleaning nozzle 4. When the pressure inside the boiler 2 is reduced, the high pressure pump 3 Valve body 44 is configured such that the valve seat 42c to the unseated to open against the resilient force of the compression coil spring 45 by a Hikitsukuri.
As a result, when the air intake valve 12 is opened, the air A in the atmosphere is connected to the inlet 42a of the female body 42 'via the cap nut 46, and the air intake pipe 47 for air release type. The air is sucked into the air intake valve 12 from the inlet 42a, the clearance between the valve seat 42c and the valve body 44, the valve chamber 42d, and the outlet 42b and flows into the water suction pipe 7 due to the suction action of the high-pressure pump 3. Pressure reduction in the boiler can 13 is prevented.
The elastic force of the compression coil spring 45 of the air suction valve 12 is such that the suction side of the high pressure pump 3 when the amount of water supply is reduced or when the water supply is stopped, and the boiler can body of the high pressure pump 3 The valve body 44 is set so as to separate from the valve seat 42c before the pressure inside the boiler 13 is depressurized and the boiler can body 13 is recessed.

Next, the case where the above-described hot water washer is used will be described.
The boiler 2 of the hot water washing machine is directly connected to the water tap 1 via the water supply hose 5, and the water W from the water tap 1 is supplied into the boiler can body 13, and then the burner 16 of the boiler 2 is activated to form the boiler can body. The water W in 13 is heated to a temperature close to about 100 ° C.
When the water W in the boiler can 13 becomes hot water W ′ having a predetermined temperature, the motor power switch 36 is turned on and the high-pressure pump 3 is driven by the motor 8. At this time, if the opening / closing valve of the cleaning gun 4 is closed, the hot water W ′ discharged from the discharge port 3 b of the high-pressure pump 3 passes through the unloader valve 11 and the downstream portion of the water suction pipe 7 and absorbs water from the high-pressure pump 3. It is returned to the mouth 3a side. For this reason, a high load is not applied to the high-pressure pump 3.
When the opening / closing valve of the cleaning gun 4 is opened in this state, the hot water W ′ in the boiler can 13 passes through the water suction pipe 7, the high pressure pump 3, the unloader valve 11 and the high pressure hose 10, and the rotary nozzle 4 a of the cleaning gun 4. From high pressure. Thereby, a car, a construction machine, an agricultural machine, etc. can be washed. At this time, the water W from the water tap 1 is sequentially supplied into the boiler can 13 through the water supply hose 5. The air vent valve 9 and the air intake valve 12 are in a closed state.

In the hot water washing machine, the hot water W ′ is continuously injected from the washing gun 4 in a state where the amount of water supplied to the boiler 2 is reduced or the water tap 1 is stopped due to an unexpected situation. When the water suction side 3 and the inside of the boiler can body 13 are depressurized, the air suction valve 12 is opened, and air A in the atmosphere is sequentially sucked into the water suction pipe 7 to prevent decompression of the boiler can body 13. . As a result, in this hot water washer, even if hot water W ′ is continuously sprayed from the washing gun 4 with the water tap 1 stopped, the inside of the boiler can 13 is not depressurized. It is possible to prevent the boiler 2 from being damaged by the 13 dents.
In addition, when the air suction valve 12 is opened and air A is sucked into the high-pressure pump 3, the warm water washer opens the air vent valve 9 provided in the high-pressure pump 3, and the air A in the high-pressure pump 3 is opened. Is discharged from the air vent valve 9 into the atmosphere. As a result, it is possible to prevent adverse effects due to the mixing of air A.
Further, in this hot water washer, when the high pressure pump 3 is restarted when restarting, the air A in the high pressure pump 3 is discharged into the atmosphere from the air vent valve 9 in which the air is released. As a result, the start of the high-pressure pump 3 can be speeded up.

1 is a schematic system diagram of a hot water washer according to an embodiment of the present invention. The sewage backflow prevention valve provided in the water supply hose is shown, (A) is an enlarged longitudinal sectional view of the state where the sewage backflow prevention valve is closed, and (B) is an enlarged longitudinal sectional view of the state where the sewage backflow prevention valve is opened. . It is an expanded vertical sectional view of the air vent valve provided in the high pressure pump. It is an expansion longitudinal cross-sectional view of the air suction valve used for a warm water washing machine.

Explanation of symbols

  1 is a water tap, 2 is a boiler, 3 is a high-pressure pump, 4 is a washing gun, 5 is a water supply hose, 6 is a sewage backflow prevention valve, 7 is a water intake pipe, 8 is a motor, 9 is an air vent valve, and 10 is a high pressure A hose, 12 is an air intake valve, 13b is a hot water outlet of the boiler, A is air, W is water, and W 'is hot water.

Claims (2)

  A closed boiler (2) that is directly connected to a water tap (1) via a water supply hose (5), stores tap water (W) supplied from the water tap (1), and heats it to a predetermined water temperature; A high pressure pump (3) connected to (2) via a water absorption pipe (7) and pumping hot water (W ′) heated by the boiler (2), and a motor (8) driving the high pressure pump (3) And a washing gun (4) with an on-off valve that is connected to the high-pressure pump (3) via a high-pressure hose (10) and injects hot water (W ′) pumped by the high-pressure pump (3). In a hot water washing machine directly connected to a water supply, when the inside of the boiler (2) is depressurized at the hot water outlet (13b) or the water absorption pipe (7) of the boiler (2) due to a decrease in the amount of water supply or stoppage of the water supply. Air suction with a check valve structure that sucks air (A) in the atmosphere to prevent decompression in the boiler (2). A valve (12) is connected in a branched manner, and the high pressure pump (3) is connected to the high pressure pump (3) when the high pressure pump (3) is started or when the high pressure pump (3) sucks air (A). A warm water washer having an air vent valve (9) for venting air inside.   The water supply hose (5) connecting the water tap (1) and the boiler (2) is provided with a sewage backflow prevention valve (6) for preventing impurities and sewage from flowing back into the water pipe. Item 2. The hot water washer according to item 1.

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