JPH0221159A - Hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To shorten heating period of time by providing an arithmetic means and a control means by which temperature of hot water in bath tab is measured when the bath tab is filled with hot water having a final bath water temperature up to a specified water level, and then hot water having a temperature calculated based on a particular formula is supplied to the bath tab up to a final water level. CONSTITUTION:After a final bath wager level H0 in a bath tab 30 and a final bath water temperature T0 are set by a control device 31, water is heated by a hot water supply heat exchanger 17 at the same flow rate that a circulation pump 26 sends water to the bath tab 30. When the water level in the bath tab reaches a specified level H1, hot water temperature T1 is measured by a bath tab water temperature detector 28. A hot water temperature is calculated by an arithmetic means 32 according to a formula; (T0 X H0 - T1 X H1) divided by (H0 - H1). Hot water having the calculated temperature is supplied up to the final bath water level H0 by the control device 33. When hot water reaches the final bath water level H0, hot water temperature is measured again by the detecting device 28. When the temperature reaches the final bath water temperature T0, the operation is stopped. When it does not, water is heated by an additional heating heat exchange 24 till the water temperature reaches T0 and then the operation is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater such as a gas water heater or a gas water heater bathtub.

BACKGROUND OF THE INVENTION In recent years, the hot water supply capacity of water heaters has increased, and more and more water heaters have automatic hot water supply functions (automatic hot water supply, automatic boiling).

An example of the water heater described above will be described below with reference to the drawings.

FIG. 2 shows a configuration diagram of a conventional water heater. In FIG. 2, 1 is a hot water supply heat exchanger, 2 is a hot water supply fuel control device that controls the amount of gas supplied to the hot water heat exchanger 1, and 3
4 is a water supply temperature detecting device provided at the outlet of the hot water supply heat exchanger 1; 5 is a water supply circuit 1 temperature sensor of the hot water supply heat exchanger 1; 6 is an edge cutting device connected to the electromagnetic valve 5, 7 is a liquid level switch provided in the edge cutting device 6, 8 is a reheating heat exchanger, which is connected to the outgoing pipe 81. Return pipe 8b
is connected to the bathtub 14. 9 is a reheating fuel control device that controls the amount of gas supplied to the reheating heat exchanger 8, 10 is a circulation pump connected to the return pipe 8b, 11 is a water level detection device in the bathtub, and 12 is a hot water temperature detection device in the bathtub. , 13 is a switching valve that is connected to the recovery pipe 8b and the edge cutting device 6, 15 is a control device that can set the boiling water level H□ of the bathtub 14 and the boiling water temperature T□ of the bathtub, and 16 is an electric control device. .

The operation of the water heater configured as described above will be described below.

After setting the boiling water level H□ of the bathtub 14 and the boiling water temperature T□ of the bathtub with the control device 15, when hot water supply operation is started, the switching valve 13 opens the edge cutting device 6 side, and the edge cutting device 6 is restored. Connect it to the circulation pump 10 side of 8b,
Then, the solenoid valve 5 opens (and the circulation pump 10 starts operating. By interlocking the liquid level switch 7 provided in the edge cutting device 6 and the water flow control device 3, the circulation pump 1
0, a flow rate equal to the flow rate conveyed to the bathtub 14 via the reheating heat exchanger 8 and the outgoing pipe 8 is heated by the hot water supply heat exchanger 1. At this time, the temperature of the water heated by the hot water supply temperature detection device 4 and the hot water supply fuel control device 2 is controlled to the boiling water temperature TQ. When the water level in the bathtub 14 reaches the boiling water level H□, the solenoid valve 5 closes and hot water supply stops.

Thereafter, the switching valve 13 closes the edge cutting device 6 side and opens the bathtub side, and the circulation pump 10 pumps the hot water in the bathtub 9 meters out.

The hot water is circulated through the return pipe 8b and the hot water temperature in the bathtub is detected by the hot water temperature detection device 12. At this time, if the hot water temperature reaches the boiling water temperature T□, the operation will be stopped, but if not, the operation will be stopped after being further heated by the reheating heat exchanger 8 until it reaches T□.

Problems to be Solved by the Invention However, with the above configuration, when the outside temperature is low, heat is radiated through piping, heat is radiated from the bathtub, or hot water is heated to warm the entire bathtub. The indoor water temperature is lower than the boiling water temperature T□.

For this reason, it takes a long time to heat up the water after supplying the water, and as a result, it takes a long time to boil the water.

In view of the above-mentioned problems, the present invention aims to shorten the boiling time by bringing the temperature of the water in the bathtub closer to the boiling water temperature upon completion of hot water supply and shortening the reheating time.

Means for Solving the Problems In order to solve the problems described above, the water heater of the present invention includes a hot water supply heat exchanger, a hot water supply fuel control device that controls fuel for heating the hot water supply heat exchanger, and a hot water supply heat exchanger. A hot water supply temperature detection device that detects the temperature of heated water, a reheating heat exchanger, a reheating fuel control device that controls fuel for heating the reheating heat exchanger, and a water level detection device in the bathtub. Equipped with a bathtub water temperature detection device and a control device that can set the bathtub's boiling water level HQ and the bathtub's boiling water temperature TO, and after starting hot water supply operation, hot water is supplied to a predetermined water level H1 at the boiling water temperature T□. This system is equipped with a calculation means and a control means for detecting the hot water temperature T1 in the bathtub at the time when the hot water temperature T1 is calculated by the following formula (% formula %) and boiling the water to a water level of 1-10.

Function The present invention detects the hot water temperature T1 in the bathtub when hot water is supplied to a predetermined water level H1 using the configuration described in E, and calculates in advance the decrease in the hot water temperature due to heat radiation and the decrease in the hot water temperature for warming the bathtub. By supplying hot water that is higher than the boiling water temperature to compensate for this, the water temperature in the bathtub at the end of hot water supply approaches the boiling water temperature, and by shortening the time required for reheating, the boiling time can be reduced. It is intended to be shortened.

EXAMPLE Hereinafter, a water heater according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration diagram of a water heater of the present invention. In FIG. 1, 17 is a hot water supply heat exchanger, 18 is a hot water supply fuel control device that controls the amount of gas that heats the hot water supply heat exchanger 17, and 19 is a water flow control device that controls the flow rate that flows into the hot water supply heat exchanger 17. 20 is a hot water temperature detection device provided at the outlet of the hot water heat exchanger 17; 21 is the hot water heat exchanger 1;
7 is a solenoid valve provided on one side of the branched hot water supply circuit 17; 22 is a edge cutting device connected to the solenoid valve 21; 23 is a liquid level SW provided in the edge cutting device 22; 24 is a heat exchanger for reheating. It is connected to the bathtub 30 by an outgoing pipe 24m and a returning pipe 24b. 25 is a reheating fuel control device that controls the amount of gas that heats the reheating heat exchanger 24; 26 is a return pipe 2;
4b is a circulation pump, 27 is a water level detection device in the bathtub, 28 is a bathtub water temperature detection device, 29 is a switching valve that is connected to the return pipe 24b and the edge cutting device 22, and 31 is the boiling water level HQ of the bathtub 30. A control device which can set the boiling water temperature T□ of the bathtub, 32 is a calculation means, 33 is a control means, and 34 is an electric control device. These 32.33.34
is connected to each sensor etc. by wiring shown by dotted lines, and inputs and outputs signals for control.

The operation of the water heater configured as described above will be explained.

After setting the boiling water level HQ of the bathtub 30 and the boiling water temperature TO of the bathtub 30 using the control device 31, when hot water supply operation is started, the switching valve 29 opens the edge cutting device 22 side and the edge cutting device 22 is restored. 24b to the circulation pump 10 side, and the solenoid valve 21 is opened (and the circulation pump 26 starts operating. By interlocking the liquid level switch 23 provided in the edge cutting device 22 and the water amount control device 19, A flow rate equal to the flow rate conveyed to the bathtub 30 by the circulation pump 26 via the reheating heat exchanger 24 and the outgoing pipe 24m is heated by the hot water supply heat exchanger 17.At this time, the hot water supply heat exchanger 17 and the hot water supply temperature detection device 20 and the hot water supply The temperature of the water heated by the fuel control device 18 is controlled to the boiling water temperature TO. When the water level in the bathtub 30 reaches the set water level H1, the solenoid valve 21 closes and hot water supply stops. Next, the switching valve 29 opens the bathtub 30 side, and the circulation pump 26 connects the outgoing pipe 2, which is a refueling circuit.
4 m, the hot water in the bathtub is circulated through the return pipe 24b, and the bathtub hot water temperature detection device 28 detects the hot water temperature T1. Furthermore, calculation means 3
2, calculate the water temperature obtained by (TOXHO-TIXHl)+(HO-81). Then, the switching valve 29 is connected to the edge cutting device 2.
2 to the hot water supply heat exchanger 17, and the control means 33
From then on, at the water temperature calculated above until the boiling water level HO,
Supply hot water according to the operations described.

After reaching the boiling water level H□, the bathtub water temperature detection device 28 detects the water temperature again according to the operation described in E. At this time,
If the water temperature reaches the boiling water temperature T□, operation will stop;
After being heated until it reaches T□, the operation is stopped.

Effects of the Invention According to the hot water supply device of the present invention, the hot water supply heat exchanger, the hot water supply fuel control device that controls the fuel that heats the hot water heat exchanger, and the hot water supply heat exchanger that heats the hot water a hot water temperature detection device that detects the hot water temperature; a reheating heat exchanger; a reheating fuel control device that controls fuel for heating the reheating heat exchanger; a bathtub water level detection device; Temperature detection device, boiling water level HO in the bathtub and boiling water temperature T in the bathtub
The system is equipped with a control device that can set the water temperature T1 after the start of hot water supply operation, and when hot water is supplied to a predetermined water level H1 at the boiling water temperature TO, the hot water temperature T1 in the bathtub is detected, and is thereafter calculated using the following formula (% formula %). Since it is equipped with a calculation means and a control means for boiling the water to the water level HQ, it calculates in advance the drop in water temperature due to heat radiation and the drop in water temperature to warm the bathtub, and then boils the water by the amount to compensate for it. By supplying hot water at a higher temperature than the L-heating water temperature, the hot water temperature in the bathtub at the time of completion of hot water supply approaches the boiling water temperature, and by shortening the re-boiling time, the boiling time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a water heater according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional water heater. 17... Hot water supply heat exchanger, 18... Hot water supply fuel control device, 20... Hot water supply water temperature detection device,
24... Heat exchanger for reheating, 25...
・Fuel control device for reheating, 27... Water level detection device in the bathtub, 28... Water temperature detection device in the bathtub, 3
1... Control device, 32... Arithmetic means, 33. Mountain... Control means. Name of agent: Patent attorney Shigetaka Awano and one other person I8
−−1ω・・− 1−− 6−・・ Otsu−・− Decoy・・− I−1ρ Fee 71W1 Earth exchanger feed 71 fi J+II? 111 Table 1 Hot water supply + 1 Abuse inspection 1
) Detection of the water level in the bathtub with the water level in the bathtub of the grass trap Φ1 which was imitated. 1. Detecting S overflow in the bathtub! control display means

Claims (1)

[Scope of Claims] A hot water supply heat exchanger, a hot water supply fuel control device that controls fuel for heating the hot water supply heat exchanger, and a hot water supply water temperature detection device that detects the temperature of water heated by the hot water supply heat exchanger. , a heat exchanger for reheating, a reheating fuel control device that controls the fuel that heats the heat exchanger for reheating, a water level detection device in the bathtub, a hot water temperature detection device in the bathtub, and a boiling water level H_0 of the bathtub. and a control device that can set the boiling water temperature T_0 of the bathtub, and after the start of hot water supply operation, the hot water temperature T_1 in the bathtub is detected when hot water is supplied to a predetermined water level H_1 at the boiling water temperature T_0, and from then on, the following formula (T_0 ×H_0-T_1×H_1)÷(H_0-H_
1) A water heater equipped with a calculation means and a control means for boiling water up to a water level H_0 at the water temperature calculated in step 1).