JPH0247391Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a water heater with a bathtub for home use.

<Prior art> A conventional water heater with a bath kettle, for example, as shown in FIG. 3 and disclosed in Utility Application No. 178807/1989 filed by the present applicant, has a can body A for producing hot water at a temperature of about 80 degrees. and a bath heat exchanger B that produces hot water at about 40 degrees, and a circulation pump D is connected between the heat exchanger B and the bathtub C, and has hot water filling, hot water addition, and reheating functions. , further can body A
A fully automatic water heater with a bath kettle is known, which supplies hot water to any location by extending a hot water supply pipe E from the bathtub.

In the middle of the hot water pipe E that supplies hot water to the hot water supply point, there is a mixing valve F that mixes hot water and water to a set temperature.
The cistern tank H for the bath is connected to the hot water supply pipe E on the upstream side of the mixing valve F, so that hot water cannot be filled or added to the bathtub C. Hot water from can body A was being supplied directly, rather than hot water whose temperature was controlled by mixing valve F.

<Problems to be solved by the invention> This conventional system is very safe and convenient when supplying hot water to hot water supply points such as showers, but it is difficult to fill and add hot water to bathtub C. Because the hot water is directly supplied, high temperatures occur at T ₁ , T ₂ , and T ₃ as shown by line B in Figure 2 when hot water is filled or added.
The differential is large and smooth, so bathtub C
There was a risk of burns if the user added hot water to the hot water that was insufficient while taking a bath.

Also, because the differential is large, it is not stable when filling or adding hot water, and therefore it is not efficient.
There were problems such as an increase in the number of times the combustion burner I was turned on and off.

<Means for Solving the Problems> In order to solve the above-mentioned problems of the conventional example, this invention includes a hot water supply can and a bath heat exchanger, and a circulation pipe is installed between the heat exchanger and the bathtub. A circulation pump is connected through the hot water supply pipe to perform hot water filling, reheating, and reheating functions for the bath, and a mixing valve is connected between the hot water outlet pipe of the can body and the water supply bypass pipe to mix hot water. In a water heater with a bath kettle that supplies hot water to any location,
A cistern tank equipped with a solenoid valve that opens and closes the bath pipe, a flow rate sensor that detects the flow rate, and a float switch, and an electric three-way valve that switches the hot water flow path are installed in the bath pipe branched from the middle of the hot water supply pipe on the downstream side of the mixing valve. Installed in series and communicating with the circulation pipe, the flow rate sensor detects the set flow rate.When filling and adding hot water to the bath, the electric three-way valve opens the bath pipe and bathtub side, and switches to the bathtub and heat exchanger side. This invention relates to a water heater with a bathtub characterized by opening control.

<Operation> As is well known, when the operation switch 19 is turned on and the hot water filling switch 22 is turned on, the combustion burner 8 starts combustion and heats the can body 1 to which water has been supplied in advance.

Therefore, the water in the can body 1 is heated to the set temperature and becomes hot water, the circulation pump 13 is started, and the mixing valve 5 → hot water pipe 6 → cistern tank 2
A certain amount of hot water is filled in the order of 7 → circulation pump 13 → bathtub 11, and when a certain amount is reached, the flow rate sensor 25 detects this, and the electric three-way valve 12 fills the bathtub 1 with hot water.
1 and the heat exchanger 2 side, at this time, the detector 14 detects the set temperature, and when the temperature is above the set temperature, it is turned off and the circulation pump 13 is stopped, and when the temperature is below the set temperature, the circulating pump 13 is stopped.
Since it continues to be ON, the circulation pump is also operated continuously, and hot water is circulated between the bathtub 8 and the heat exchanger 2 by reheating.

Once the bathing temperature has been reached, the hot water filling switch 22 is turned OFF.

Next, during bathing, the hot water in the bathtub 11 will be used and the hot water will be running low, so in order to make up for the shortage, the hot water switch 23 will be turned on, the solenoid valve 20 will open, and the electric three-way valve 12 will open. cistern tank 27
The side and bathtub side are opened, the circulation pump 13 is operated, and the hot water in the can body 1 is mixed with water at the set temperature by the mixing valve 5, and the hot water pipe 6 → bath pipe 26 → flow rate sensor 25 → cistern tank 27 → Circulation pump 13 → Hot water volume is added to the hot water shortage in the order of bathtub 11, and when it reaches a certain level, flow rate sensor 25 detects this, and electric three-way valve 12 connects bathtub 11 and heat exchanger 2 side, stopping hot water addition. be done.

Of course, even when hot water is supplied at a hot water supply point using the faucet 32, the hot water is supplied at the temperature set by the mixing valve 5 in exactly the same manner as in the conventional case.

That is, as shown in lines A and C in FIG. 2, hot water is supplied evenly, thereby preventing high temperatures and large differentials.

<Example> 1 is a can body for hot water supply, the inside of which is treated with anti-corrosion treatment with enamel etc., and a heat exchanger 2 for bathing is enclosed inside,
One side is connected to the water inlet pipe 3, and the upper hot water outlet pipe 4 is connected, and the hot water outlet pipe 4 is connected to the hot water supply pipe 6 via the mixing valve 5, and the mixing valve 5 has a bypass branching from the water supply pipe 3. A combustion burner 8 serving as a heat source is provided further below to which the pipe 7 is connected.

The mixing valve 5 has a built-in well-known thermowax, and the temperature is set with a knob 9.
The thermowax expands and contracts in an attempt to maintain the temperature setting, and this moves the valve to adjust the amount of hot water. The heat exchanger 2 has a coil shape, and one side is connected to the bathtub 11 via a return pipe 10' which is a circulation pipe 10, and the other is an electric three-way valve connected in the middle of an outgoing pipe 10'' which is a circulation pipe 10. It is connected to the bathtub 11 via 12.1
3 is a circulation pump, electric three-way valve 1 with a 10" outgoing pipe
It is connected to the bathtub 11 side of No. 2, and is connected in series with a detector 14 that detects the temperature of hot water in the bathtub 11 in terms of an electric circuit.
A 3 minute ON time is programmed as the set time.

The detector 14 has a set temperature of 40 to 45 degrees, and is configured to turn on when the temperature is lower than that and turn off when it is higher than that.

16 is a hot water temperature detector, and the detected temperature can be varied by operating the temperature control knob 18 of the operation part 17, but normally it detects 80 degrees and when it is higher than that, the combustion burner 8 is turned on.
OFF, and when the temperature is lower than that, turn on the combustion burner 8.

The operation section 17 includes an operation switch 19 that also serves as a power switch, a hot water supply switch 21 that opens and closes a solenoid valve 20, a hot water filling switch 22 that automatically fills hot water, and a hot water supply switch 22 that uses hot water in the bathtub 11. It is equipped with a reheating switch 23 for replenishing hot water when it is insufficient, and a reheating switch 24 for heating or keeping hot water in the bathtub 11 when its temperature has dropped, and a switch for switching from hot to lukewarm as necessary. The microcomputer 15 may be connected to the microcomputer 15, and necessary programs input into the microcomputer 15 by each switch operation are operated in conjunction with the microcomputer 15.

25 is installed in the middle of the bath pipe 26 branched from the hot water supply pipe 6, and the microcomputer 1 automatically fills hot water, counts the flow rate of additional hot water, and controls the set flow rate.
5, which is connected in series with the solenoid valve 20.

A cistern tank 27 is provided between the flow rate sensor 25 and the electric three-way valve 12, and is equipped with a float switch 28 that always maintains a constant flow rate.

29 is an air vent valve device that also serves as a pressure switch.
30 is a pressure reducing check valve. 31 is a relief valve. 32 is a faucet.

<Effect of the idea> This idea ensures that the hot water always flows through the mixing valve and is maintained at the set temperature, not only when hot water is supplied, but also when filling the bath with hot water or adding hot water.
Therefore, hot water is prevented from coming out, and there is no danger of getting burned by hot water when filling or adding hot water.

Also, the differential is smaller and more efficient, which reduces the number of times the combustion burner is turned on and off, making it more economical.

Also, since the solenoid valve and cistern tank are installed in series, even if either the solenoid valve or the cistern tank fails to remain open for some reason, one of them will be closed, and the bathtub will be closed. This prevents the danger of leaving hot water flowing inside or overflowing, and the wastage of hot water.

Furthermore, when the electric three-way valve is stopped by the flow rate sensor from filling the bath with hot water or adding hot water, it is automatically switched to reheating, further improving reliability and convenience.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an embodiment of this invention, Fig. 2 is a comparison table of the state of the same hot water and that of the conventional example, and Fig. 3
The figure is an explanatory diagram of a conventional example. 1... Can body, 2... Heat exchanger, 4... Output pipe,
5...Mixing valve, 6...Hot water pipe, 7...
Bypass pipe, 10... Circulation pipe, 11... Bathtub, 1
3... Circulation pump, 27... Cistern tank,
32...Faucet.

Claims (1)

[Scope of utility model registration request] It is equipped with a can body 1 for hot water supply and a heat exchanger 2 for the bath, and a circulation pump 13 is connected between the heat exchanger 2 and the bathtub 11 via a circulation pipe 10 to fill and add hot water to the bath. It has a reheating function and also has a hot water outlet pipe 4 of the can body 1.
In a hot water heater with a bath kettle, which connects a mixing valve 5 for mixing hot water between a water supply bypass pipe 7 and a water supply pipe 7 to supply hot water to any desired location, a part of the water supply pipe 6 on the downstream side of the mixing valve 5 is used. A solenoid valve 2 that opens and closes the bath pipe 26 is attached to the bath pipe 26 branched from the bath pipe 26.
A cistern tank 27 equipped with a flow rate sensor 25 for detecting 0 and flow rate and a float switch 28, and an electric three-way valve 12 for switching the hot water flow path are installed in series and communicated with the circulation pipe 10, and furthermore, the flow rate sensor detects the set flow rate. When filling the bath with hot water and adding hot water, use the bath pipe 2.
This water heater with a bathtub is characterized in that an electric three-way valve 12 which opens the bathtub 11 side and the bathtub 11 side is switched to open the bathtub 11 side and the heat exchanger 2 side.