JPH0334566Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a hot water heating device that reheats bath water using circulating hot water for heating.

(b) Prior art When reheating the bath water in the bathtub with the above-mentioned circulating hot water, for example, as shown in Japanese Patent Application Laid-Open No. 60-165463, a part of the circulating water for heating is added to the bathtub. The bath water is heated by being circulated to an adjacent bath water heater, but in this case there is a problem in that the bath water is caused by natural convection and the heat exchange efficiency is low.

(c) Problems to be solved by the invention The purpose of the invention is to efficiently heat a heating coil for heating bath water using circulating hot water for space heating.

(d) Means for solving the problem The present invention consists of a hot water circulation flow path in which a heat exchanger, a radiator, a tank, and a circulation pump are connected in a loop, and both ends are opened at the bottom of the bathtub, and a bathtub is connected in the middle. The bath water circulation path is equipped with a heating coil that is housed in the pump and tank and heats the hot water in the hot water circulation path, and the combustion of the burner that heats the heat exchanger is controlled to set the hot water temperature in the hot water circulation path to the set temperature. A heating control means is provided, and when the bath pump is operated to heat the bath water in the bath water circulation path, the set temperature is set to a predetermined higher temperature.

(e) Effect When heating is performed by circulating hot water in the hot water circulation flow path, the temperature of this hot water is controlled to, for example, around 80°C, and on the other hand, when the bath pump is operated to reheat the bath water. In this case, the temperature of the hot water is controlled to a relatively high temperature, for example, 85°C.

(f) Example The example of the present invention will be explained based on the drawings.1
is the so-called hot water heater main body, which includes a hot water heat exchanger 3, a heating heat exchanger 4, a hot water heat exchanger 5, a heating burner 6, and exhaust gas from these burners to the outside. Exhaust duct 7,
An exhaust fan 8, a fuel passage 9 for supplying fuel to the burners 5 and 6, and a hot water circulation passage 12 with the heating heat exchanger 4 connected thereto and a circulation pump 10 and a tank 11 successively connected upstream of the heating heat exchanger 4. etc. are stored.

The hot water supply heat exchanger 3 has a hot water tap 1 downstream thereof.
3 is connected, and a bath hot water supply path 14 is branched and connected upstream of this hot water tap. An electric hot water supply valve 15 is provided in the middle of the bath water supply path 14, and a hot water outlet 16 is opened at the inner bottom of the bathtub 17.

The fuel flow path 9 is provided with a main solenoid valve 18 upstream, and branches downstream of the main solenoid valve into a hot water supply gas path 9' and a heating gas path 9''. A hot water supply solenoid valve 19 and a hot water supply solenoid proportional valve 20 are connected in sequence, and a heating solenoid valve 21 is connected to the heating gas path 9''.
The heating electromagnetic proportional valves 22 are connected in sequence. Note that a bypass 23 is provided in this heating electromagnetic proportional valve.

Furthermore, a radiator 24 installed indoors or the like is connected to the hot water circulation flow path 12, and a bypass circulation path 25 is provided that communicates the downstream of the heating heat exchanger 4 with the upstream of the tank 11. A bypass solenoid valve 26 is provided in the circulation path.

Reference numeral 27 denotes a bath water circulation path which has an inlet 28 and an outlet 29 opening at the inner bottom of the bathtub 17 at both ends, and a bath pump 30 and a heating coil 31 connected in the middle. The bath water circulation path 27 is disposed in the water 32, and the bath water circulation path 27 is supplied with this circulating water.
It is configured to heat the bath water 33 circulating inside.

On the other hand, at the outlet portions of the hot water supply heat exchanger 3, the heating heat exchanger 4, and the bath pump 30, a hot water supply sensor 34 such as a thermistor that detects the temperature of the hot water flowing through the portion, the temperature of the circulating water, and the temperature of the bath water, respectively. Heating sensor 3
5. A bath sensor 36 is provided.

37 is a control circuit connected to a bath remote control 38 installed in a bathroom, etc., and a sub remote control 39 installed in a kitchen, etc., and a bath firing switch 4 installed in the remote control.
0. The above-mentioned electromagnetic valves, pumps, etc. are controlled according to the operation of the heating switch 41, etc.

When heating is performed by turning on the radiator 24, when the control circuit 37 detects the turning-on operation, the circulation pump 10 is activated and the heating sensor 3 is turned on.
5, the temperature of the circulating water 32 is detected, and if it is below the first set temperature (for example, 80°C), the heating burner 6 is controlled to burn to maintain the set temperature.

In addition, when reheating the bath water 33 in the bathtub 17, the control circuit 37 detects this by turning on the bath heating switch 40, and activates the bath pump 30, causing the bath sensor 36 to turn on the bath water 33. The temperature of the bath water 33 is detected, and this temperature is suitable for bathing (for example, 42
If the temperature is lower than the set temperature, the circulation pump 10 is activated, and the heating sensor 36 detects the temperature of the circulating water 32.
°C) heating burner 6 to reach the high second set temperature.
combustion control, and at the same time the bypass solenoid valve 2
6 is opened, and part of the circulating water that has passed through the heating heat exchanger 4 is circulated directly to the tank 11 via the bypass circulation path 25.

In addition, as mentioned above, by increasing the heating setting temperature of the circulating water 32 from 80℃ to 85℃ during reheating, we were able to increase the capacity of the heating coil 31 by about 1.125 times. We were able to reduce the rate of decrease in heating output from 18% to 7% when both were done at the same time. Also, as mentioned above, set the temperature of the circulating water 32.
When the temperature rises from 80℃ to 85℃, gas consumption increases, but reheating time is generally about 10 minutes/day, while heating time is long at 10 hours/day, so the increase in gas consumption is small. be.

(g) Effects of the invention With the configuration according to the invention, it is possible to increase the heating efficiency of the heating hot water of the heating coil that circulates and heats the bath water, and when the circulation heating and heating of the bath water are performed at the same time. can reduce the decline in heating capacity of

[Brief explanation of the drawing]

The drawing is a schematic diagram of a hot water heater equipped with a hot water heating device according to the present invention. 4... Heating heat exchanger, 6... Heating burner,
10... Circulation pump, 11... Tank, 12...
Hot water circulation channel, 24...radiator, 27...bath water circulation path, 30...bath pump, 31...heating coil, 32...circulating water, 33...bath water, 37...control circuit.

Claims (1)

[Scope of utility model registration request] A hot water circulation channel in which a heat exchanger, a radiator, a tank, and a circulation pump are connected in a loop, and a bath pump that opens at both ends to the bottom of the bathtub and is housed in the tank and supplies hot water to the hot water circulation channel. and a control means for heating the hot water in the hot water circulation path to a set temperature by controlling the combustion of a burner that heats the heat exchanger, and the bath pump The hot water heating device is configured to set the set temperature to a predetermined higher temperature when operating the bath water in the bath water circulation path to heat the bath water.