JPH048696B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a water heater with a bath water supply function that can also supply hot water to a bathtub.

<Prior art and its problems> Fig. 4 shows an example of a conventional hot water supply device with bath hot water supply function. In this conventional example, when hot water is supplied to the bathtub 1, the hot water heated by the water heater 2 is always kept at a constant temperature, for example, 38°C, through a fixed mixing valve 3.
The structure is such that the water is supplied to the bathtub 1 at the same time. 4 is a drop-in hopper, and 5 is a heat exchanger body for reheating the bath.

However, it is convenient for the temperature of hot water supplied to the bathtub 1 to be closer to the set bath temperature (bathtub temperature) because the reheating time can be shortened.

For this reason, the inventors of the present invention considered supplying bath water at the bath set temperature, but if the burner on/off control temperature of the water heater matches the bath set temperature, temperature errors due to temperature hysteresis of the water heater, instrument characteristics, etc. This caused a problem in that the hot water actually supplied to the bathtub exceeded the bath set temperature.

<Purpose> Therefore, the present invention solves the drawbacks of the above-mentioned conventional technology, and
To provide a hot water supply device with a bath hot water supply function capable of supplying hot water almost at a set temperature to a bath without the hot water supply to the bathtub exceeding a set bath temperature.

<Means for Solving the Problems> The present invention includes a hot water supply tank 22 with a small amount of stored hot water as a heat exchanger, and in addition to the normal hot water supply function of supplying hot water to the kitchen and other places, it also supplies hot water to the bathtub. A water heater with a bath water supply function, which is capable of automatically switching the temperature setting of the water heater 20 from the temperature setting for normal hot water supply to the temperature setting for bath water supply when supplying bath water, It is characterized in that the combustion of the burner 21 of the water heater is stopped at a temperature lower than the bath set temperature by the temperature hysteresis generated in the hot water tank 22.

<Function> During hot water supply for the bath, the combustion of the burner 21 is stopped when the temperature of the hot water tank 22 becomes lower than the bath set temperature by the temperature hysteresis of the hot water tank 22. 22
The temperature further increases by the amount of temperature hysteresis, and hot water at a temperature close to the bath set temperature is supplied to the bath. In addition, the bath water supply temperature does not exceed the bath set temperature by much.

<Example> Fig. 1 is an overall configuration diagram of an apparatus implementing the present invention, Fig. 2 is a detailed block diagram of a control section and a remote control section, and Fig. 3 is a detailed block diagram of a control section and a remote control section.
The figure is a control flowchart.

A heat exchange can 5 for reheating the bath is provided in the bathtub 1, and the can 5 is heated by a reheating burner 5a. The hot water in the bathtub 1 is circulated to the can body 5 and heated. A hopper 4 for pouring hot water into the can body 5
The hot water dropped into the hopper 4 is supplied into the bathtub 1. 6 is a pump for forced circulation.

The water heater 20 is of a semi-storage type, for example, and hot water heated by combustion heat from a hot water supply burner 21 is supplied from a hot water tank 22 and is dropped into the hopper 4 through a bath water supply pipe 23. 24 is an electromagnetic on-off valve.

The control unit 30 has a built-in microcomputer 31, which controls the hot water burner 21 and the electromagnetic on-off valve 24 via an interface 32 according to a predetermined program, and also controls the reheating burner 5a. The control unit 30 receives temperature information from the hot water temperature sensor 25 and bath temperature sensor 5b, as well as commands from the remote control unit 40. The remote control section 40 includes a normal hot water supply switch 41, a normal hot water supply temperature setting section 42, a bath hot water supply switch 43,
A bath hot water temperature setting section 44 is provided. When the bath water supply temperature setting unit 44 sets the bath temperature T _F , it is input to the control unit 30, and the combustion stop temperature T _OFF of the hot water supply burner 21 of the water heater 20 during bath water supply is set according to the bath setting. The temperature is set to be lower than the temperature T _F by the adjustment temperature T _A. At the same time, the combustion start temperature T _ON of the hot water supply burner 21 is set to be lower than the combustion stop temperature T _OFF by one adjustment temperature T _B. Said adjustment temperature T _A
Only the lower temperature is set. Said adjustment temperature
For T _A , the temperature at which the hot water temperature in the hot water supply tank 22 further increases even after the combustion of the hot water supply burner 21 is stopped, that is, the temperature hysteresis is obtained experimentally in advance and is employed. Adjust temperature T _A in this way
By determining , the temperature of the hot water actually supplied to the bathtub 1 does not exceed the bath set temperature T _F by much, and hot water can be supplied at a temperature almost close to the bath set temperature T _F. Also, by determining T _B ,
It is possible to prevent the hot water supply burner 21 from starting combustion even though the actual hot water supply temperature does not fall below T _ON , and to prevent T _ON from falling too below T _OFF . The T _A and T _B may be changed depending on the T _F temperature.

In addition, in normal hot water supply, when the hot water supply setting temperature _TQ is set by the normal hot water supply temperature setting section 42,
This is input to the control unit 30, and the combustion stop temperature T _OFF of the hot water supply burner 21 is set to T _Q , and the combustion start temperature T _ON of the hot water supply burner 21 is set to the combustion stop temperature T OFF.
The temperature is set to be closer to the adjustment temperature T _C than T _OFF .
The reason for providing the adjustment temperature T _C is the same as the reason for providing the above-mentioned temperature T _B.

The control operation by the control section 30 will be explained according to the flowchart in FIG.

Now, when the bath water supply switch 43 is turned on manually or automatically, the bath water supply temperature setting section 44 inputs the bath set temperature T _F to the computer 31, and the electromagnetic on-off valve 24 is opened. Then, the combustion stop temperature T _OFF and combustion start temperature T _ON of the hot water supply burner 21 are calculated. When the temperature T input from the hot water temperature sensor 25 is lower than the combustion start temperature T _ON , the hot water burner 21 starts combustion, and when the temperature T becomes higher than the combustion stop temperature T _OFF , the hot water burner 21 stops. On the other hand, when the bath hot water supply switch 43 is off and the normal hot water supply switch 41 is on,
The hot water supply setting temperature _TQ is inputted from the normal hot water supply temperature setting unit 42 to the computer 31, T _OFF and T _ON are calculated, and compared with the temperature T from the temperature sensor 25, and the hot water supply burner 21 is turned on and off.

<Effects> The present invention has the above configuration, and during bath hot water supply,
Since the combustion of the burner 21 of the hot water heater is made to stop at a temperature lower than the bath set temperature by the temperature hysteresis generated in the hot water tank 22, the temperature of the hot water tank 22 further increases by the temperature hysteresis after the combustion stops. Hot water at a temperature close to the bath set temperature is supplied to the bath. In addition, the bath water supply temperature does not exceed the bath set temperature by much.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of the device implementing the present invention, Fig. 2 is a detailed block diagram of the control section and remote control section, and Fig. 3 is a detailed block diagram of the control section and remote control section.
The figure is a control flowchart, and FIG. 4 is a configuration diagram of a conventional device. 1: Bathtub, 20: Water heater, 21: Hot water burner,
24: Solenoid on/off valve, 25: Hot water temperature sensor, 3
0: Control unit, 31: Microcomputer, 4
0: Remote control unit, 43: Bath hot water switch, 4
4: Bath hot water temperature setting section.

Claims (1)

[Claims] 1 Hot water tank with a small amount of hot water stored as a heat exchanger 2
2, in addition to the normal hot water supply function that supplies hot water to the kitchen and other areas, it can also supply hot water to the bathtub, and when supplying bath water, the temperature setting of the water heater 20 can be changed from the temperature setting for normal hot water supply to the temperature setting for bath hot water supply. This is a water heater with a bath water supply function that automatically switches to the temperature setting, and during bath water supply, the combustion of the burner 21 of the water heater is controlled by the temperature hysteresis that occurs in the hot water tank 22 due to the bath temperature setting. A water heater with a bath hot water supply function that is characterized by stopping at a low temperature.