JPH0464864A - Preventing device for hot water reverse flow in bath heater - Google Patents

Abstract

PURPOSE:To ensure the heating of water without producing the reverse flow phenomenon by a method wherein a water stop valve and a check valve for introducing water in a bathtub toward only a heating pipe are integrally formed to make up a water stream control part and, when the water level is higher than a water inlet opening, the check valve is raised to a position confronting the water inlet opening due to its buoyant force and, when it is lower, the water stop valve is lowered under its own weight below the water inlet opening to draw the water in. CONSTITUTION:When a heating pipe is heated by a heating part, the temperature of water in the heating pipe is raised and the resulting hot water is run, due to its specific gravity and as a hot water, from a water supply opening into a bathtub. At this time, due to the negative pressure produced in the heating pipe, a check valve 16 is opened toward the heating pipe, a cold water in the bathtub is also allowed to flow from a water inlet opening into the heating pipe and heated therein and the water is raised due to a decrease in specific gravity, made hot and allowed to flow into the bathtub from the water supply opening. A cyclic operation per the aforesaid procedure is repeated. When the heating is stopped, since the heating pipe is cooled by outside air, the temperature of the hot water in the heating pipe is decreased and its specific gravity is increased. Although such water attempts to run reversely from the water inlet opening located below, it is not possible as the check valve 16 blocks an opening part 14.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a water supply port and a water intake port arranged vertically on the side wall of a bathtub, and connects them to the ends of heating pipes of a burner, thereby reducing the amount of water in the bathtub. This is an invention of a device that is installed in a bathtub that heats hot water while circulating it to prevent backflow of hot water from inside the bathtub to the bathtub.

(Prior Art) Conventionally, as shown in FIG. 4, a water intake port 3 is provided at the bottom of a side wall 2 above the bathtub, and a water supply port 4 is provided at the top thereof, and these are connected to a heating pipe 5 inside a bath pot 7. When the heating tube 5 is heated by a heating unit 6 such as a gas burner, the hot water in the heating tube 5 decreases its specific gravity and rises, causing water to freely circulate between the bathtub 1 and the heating tube 5. Bathtub 1 as hot water from 4
A bathtub is known in which the cold water in the bathtub 1 is drawn into the heating pipe 5 from the water intake port 3 to sequentially heat the hot water in the bathtub.

(Problem to be Solved by the Invention) However, in this conventional bath pot 7, when the heating tube 5 is not heated, the heating tube 5 is cooled by the outside air, so the temperature of the hot water in the heating tube 5 decreases. - The water increases its specific gravity, moves downward, and flows out from the water intake 3 into the bathtub 1, creating a so-called backflow phenomenon in which the hot water in the bathtub is sequentially cooled in a process that is exactly the opposite of the heating process described above. There was a drawback.

In addition, if a check valve is installed at the water intake to prevent this backflow phenomenon, hot water will remain in the heating pipe even when the hot water in the bathtub is drained, making it easy for rust to form inside the heating pipe and reducing its durability. It was not suitable for practical use because of the problem of significant damage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a backflow prevention device that can reliably keep hot water warm without causing the above-mentioned backflow phenomenon, and can also reliably discharge hot water inside a heating pipe when draining water.

(Means for Solving the Problems) In order to achieve the above object, the backflow prevention device of the present invention has the following features:
The water flow control unit is formed by integrally forming the water stop valve that stops the flow of water and the check valve that conducts the water in the bathtub only in the direction of the heating pipe, and when the water level is higher than the water intake port, the water flow is reversed due to buoyancy. A stop valve is placed in the water intake, and when the water level is lower than the water intake, the water stop valve is lowered to below the water intake due to its own weight.

(Function) When water is poured into a bathtub equipped with the backflow prevention device configured as described above, when the water level is higher than the water intake, the water stop valve floats up and closes the water intake.

When heating, the reverse pressure valve is drawn toward the heating pipe and opened due to the depressurization inside the heating pipe, so hot water in the bathtub flows into the heating pipe from the water intake port, is heated, and hot water is pumped into the bathtub from the water supply port. supply

When heating is not being performed, the check valve closes to shut off the water intake and prevent backflow of hot water from the direction of the heating pipe.

When the water level in the bathtub becomes lower than the water intake, the water stop valve lowers due to its own weight, opens the water intake, and releases the hot water in the heating pipe.

(Example) Examples will be described with reference to the drawings.

In FIG. 4, a water intake port 3 is provided in the side wall 2 of the bathtub 1,
A water supply port 4 is provided above it. A heating pipe 5 is installed outside the bathtub.
A bath pot 7 having a heating section 6 such as a gas burner for heating the heating tube 5 is installed. And the water intake port 3 and the heating pipe 5
The lower end of the water supply port 4 and the upper end of the heating pipe 5 are connected by appropriate connecting pipes 8 and 9, respectively, so that water can circulate freely between the inside of the bathtub 1 and the heating pipe 5.

1 and 2 a-c show a first embodiment in which a check valve that opens only in the direction of the heating pipe is provided at the opening of the water stop valve.

An opening 10 is provided at the upper end of the mounting seat 12, and frames 11, 11 for fitting the water valve 13 are provided at both ends thereof. be fixed so that it is located in front of the

In addition, the water stop valve 13 and the check valve 16 are formed of resin or the like having a specific gravity smaller than that of water, and the lower end of the check valve 16 is attached to the lower part 15 of the opening 14 provided in the water stop valve 13 on the side of the heating pipe. Mount it so that it opens only in the direction of the heating tube.

Then, the water stop valve 13 is fitted into the frames 11.11 at both ends of the mounting seat 12 so as to be movable up and down.

When water is poured into the bathtub 1, when the water level in the bathtub is higher than the water intake port 3, the water stop valve 13 floats up and closes the front surface of the water intake port 3. Here, since the check valve 16 has a specific gravity smaller than that of water, it tries to stand up vertically using the shaft mounting part 15 as a fulcrum, and closes the opening 14 (FIG. 2a).

When the heating tube 5 is heated by the heating section 6, the temperature of the hot water inside the heating tube 5 increases, its specific gravity is reduced, and the hot water flows into the bathtub 1 through the water supply port 4.

At this time, the inside of the heating pipe 5 is depressurized, so the check valve 16 opens in the direction of the heating pipe 5 (Fig. 2b), and the cold water in the bathtub 1 flows from the water intake 3 into the heating pipe 5. Inflow and heating tube 5
The hot water is heated inside the tub, its specific gravity is reduced, the water rises, and the hot water flows into the bathtub 1 through the water supply port 4. These operations are then repeated.

Furthermore, when heating is stopped, the heating tube 5 is cooled by the outside air, so the temperature of the hot water in the heating tube 5 decreases, its specific gravity increases, and it tries to flow backwards from the water intake 3 located below. Since the check valve 16 blocks the opening 14 (FIG. 2a), no backflow occurs.

When draining water from the bathtub 1, the plug 32 of the drain port 31 provided at the bottom of the bathtub 1 is removed. The water level in the bathtub 1 is the water stop valve 1
3, the water stop valve 13 will close to the mounting seat 12 due to its own weight.
The heating pipe 5 descends to the lower end and the water intake 3 opens.
The hot water inside is discharged (Fig. 2 C).

Figures 3a-c show a second embodiment using a floating ball check valve.

An exterior body 22 having a circular opening 24 and an upwardly curved slope 25 on the upper surface of the inner wall is provided at the water intake port 3 of the bathtub 1, and a stopper 21 such as a net is provided on the heating pipe 5 side of the exterior body 22. .

A floating ball check valve 26 having a specific gravity smaller than that of water is loosely installed inside the exterior body 23.

When water is poured into the bathtub 1, when the water level becomes higher than the water intake port 3, the floating ball check valve 26 floats along the inclined surface 25 and fits into the opening 24 (FIG. 3a).

When the heating tube 5 is heated by the heating section 6, hot water inside the heating tube 5 is heated and its specific gravity is reduced, so that the hot water rises inside the heating tube 5 and flows into the bathtub 1 through the water supply port 4. At this time, the water pressure inside the heating tube 5 becomes depressurized, so the floating ball check valve 26 fitted into the opening 24 is sucked in the direction of the heating tube 5, creating a gap between it and the opening 24. , hot water in the bathtub 1 flows into the heating pipe 5 from the water intake 3 (FIG. 3b).

The hot water flowing into the heating pipe 5 is heated here, its specific gravity is reduced, rises, and flows into the bathtub 1 through the water supply port 4. These operations are then repeated.

Furthermore, when heating is stopped, the heating tube 5 is cooled by the outside air, so the temperature of the hot water in the heating tube 5 decreases, increases its specific gravity, and flows back into the bathtub 1 from the water intake 3 located below. However, the floating ball check valve 26 installed at the water intake 3
blocks the opening 24, so there is no backflow (Fig. 3a).

When draining water from the bathtub 1, the plug 32 of the drain port 31 provided at the bottom of the bathtub 1 is removed. When the water level in the bathtub 1 becomes lower than the floating ball check valve 26, the floating ball check valve 26 falls into the exterior body 22 due to its own weight, and the opening 24 is opened, so that the hot water in the heating pipe 5 is It is released into the river (Figure 3C).

It goes without saying that the backflow prevention devices A and B of these embodiments may be embedded in the inner wall of the bathtub.

(Effects of the Invention) Since the present invention is configured as described above, it produces the effects described below.

A water stop valve that closes the water intake and a check valve that opens and closes the opening of the water stop valve to allow water to flow only in the direction of the heating pipe are installed. When there is no hot water in the bathtub, there is no backflow of hot water in the bathtub via the heating pipe, and the hot water can be reliably kept warm.

Also, when draining water, the water stop valve descends and opens the water intake, so
Hot water does not accumulate inside the heating pipe during drainage, and rust can be effectively prevented from forming inside the heating pipe.

[Brief explanation of the drawing]

1 and 2 a-c show a first embodiment in which a water stop valve is provided with a check valve, FIG. 1 is a perspective view thereof, and FIG. 2 is a side sectional view showing its operation. 3A to 3C are side sectional views showing the operation of the second embodiment using a floating ball check valve, and FIG. 4 is a side sectional view of a bathtub and a bathtub. 1... Bathtub, 3... Water intake, 4... Water supply port, 5...
・・Heating pipe, 7・・Bath pot, 8, 9・・Connecting pipe,
12... Mounting seat, 13... Water stop valve, 16... Check valve, 21... Net, 22... Exterior body, 26... Floating ball check valve, 31... Drain port, A...backflow prevention device of the first embodiment, B...backflow prevention device of the second embodiment

Claims (3)

[Claims] (1) Water supply and water intake ports are installed vertically on the side wall of the bathtub, and these are connected to the ends of the heating tubes of the burner to stop the flow of water in a bathtub that circulates and heats the water in the bathtub. A water flow control unit is formed by integrally forming a water stop valve and a check valve that conducts water in the bathtub only in the direction of the heating pipe, and when the water level is higher than the water intake, the check valve is closed to the water intake due to buoyancy. When the water level is lower than the water intake, the water stop valve is lowered by its own weight to the bottom of the water intake. (2) A bathtub according to claim 1, wherein a check valve that opens only in the direction of the heating pipe is provided at the opening of the water stop valve, and the water stop valve is mounted on a mounting seat installed at the water inlet so as to be able to rise and fall freely. Hot water backflow prevention device. (3) An exterior body with a circular opening is provided at the water intake, and a floating ball check valve is loosely installed inside the exterior body, and when the water level is higher than the water intake, the check valve is fitted into the opening. 2. A method for preventing backflow of hot water in a bathtub according to claim 1, wherein the check valve is configured to block the flow of water from the direction of the heating pipe, and when the water level is lower than the water intake port, the check valve falls into the exterior body from the opening. Device.