JP2001255001A - Bath water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute simultaneous operations of water heating and reheating of a bathtub water as much as possible by using capability of implements to a maximum limit in a single-can two-water channel water heater. SOLUTION: A bath water heater calculates a bath side heat absorption amount from a circulating water temperature of a bath side and a circulating flow rate at simultaneous operation control time of water heating and reheating of the bathtub water, calculates a water heating side usable capability from a maximum capability of implements, further controls a flow rate of hot water supply and simultaneously operates both the water heating and reheating of the bathtub water. The heater calculates a hot water supply output at that time so as to decide a continuation or a stand-by of the reheating of the bathtub water. Thus, the capability of the implement is used to a maximum limit to provide an effect of simultaneously operating both the water heating and the reheating of the bathtub water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water heater having both a hot water supply function and a bath reheating function.

[0002]

2. Description of the Related Art A conventional one-water / two-water type water heater configured such that a hot water supply passage and a bath passage pass through a common heat exchanger, when reheating is performed during hot water supply, is a problem in that an appliance is not used. When the amount of combustion is insufficient, the temperature of hot water is fluctuated. Therefore, priority is given to using hot water, and reheating is prohibited. But in this,
During the use of hot water, additional heating was not possible at all, and additional heating was started after the use of hot water, so there was a problem that additional heating took time.

[0003] In order to solve the above-mentioned problem, in some cases, when the amount of combustion during single use of hot water supply is less than a predetermined number, reheating is started to enable simultaneous use.

[0004]

However, in the above-mentioned conventional hot water supply apparatus, the start of additional heating combustion is determined only in the hot water supply combustion state. The value was determined at a value that did not affect the hot water supply side even after starting the heating. However, the amount of heat absorbed on the bath side varies depending on the circulating flow rate of the bath passage and the temperature of the circulating water, and when the circulating flow rate of the bath passage is small or the temperature of the circulating water is high, the amount of heat absorbed on the bath side is large. Therefore, the number of usable hot water can be increased. Nevertheless, bath combustion is prohibited with the determination value determined only by the hot water combustion state. Therefore, there was a problem that the reheating was time-consuming, or the reheating was attempted, but the reheating was not performed.

[0005] In addition, the shortage of the combustion capacity during simultaneous operation is only a slight change in the flow rate of hot water, and even if the flow rate of hot water is fluctuated for practical use, there is no effect on usability. In spite of the state which can be done, reheating was prohibited and there was a problem that usability was bad.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention provides a bath water heater, in which the amount of heat absorbed on the bath side is reduced.
Drive the bath circulation pump to circulate the bath water, calculate the hot water supply capacity from the bath heat absorption and the maximum capacity of the appliance, based on the temperature detected by the bath temperature thermistor. Control and
The bath pump operation can be controlled based on the value of the actual use capacity of the hot water supply which can be calculated from the appliance combustion amount, the hot water supply temperature and the flow rate.

[0007] According to the above invention, the available heat capacity of the hot water supply side can be calculated according to the current bath side conditions by obtaining the heat absorption amount of the bath side according to the actual state of the bath side. Since the flow rate of hot water can be controlled in accordance with the result, simultaneous operation control using the maximum capacity of the appliance can be performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bath water heater according to claim 1 of the present invention has a common heat exchanger through which a hot water supply passage for hot water supply and a bath passage for additional heating of the bath pass, and a combustion device for heating the heat exchanger. Department and
Combustion control means for controlling combustion in the combustion section in response to a hot water supply request and a bath reheating request, a water supply temperature sensor for detecting a water supply temperature in the hot water supply passage, and a heat exchanger temperature sensor for detecting a heat exchanger temperature A hot water supply temperature sensor for detecting a hot water supply temperature, a flow rate sensor for detecting a flow rate of the hot water supply passage, a bypass passage for bypassing the heat exchanger, and a water flow control valve for controlling a hot water supply flow rate. It has a bath circulation pump that circulates water and performs reheating combustion, and a bath temperature sensor that detects the temperature of bathtub water.

When a request for hot water supply and a request for reheating are simultaneously received, the bath circulation pump is driven to circulate bath water, and the temperature of the bath water is detected by the bath temperature sensor.
The amount of heat absorbed on the bath side is calculated from the temperature and the circulating flow rate, and the value obtained by subtracting the amount of absorbed heat from the bath from the maximum capacity of the appliance is used as the capacity for hot water supply. The hot water supply flow rate is calculated from the temperature, and the flow rate of the hot water supply control valve is controlled so that the hot water supply and the additional heating can be performed simultaneously without causing a change in the hot water supply temperature.

Further, in the simultaneous operation state controlled by the simultaneous operation control means, when the appliance is performing the maximum combustion control, the detected temperature of the feed water temperature sensor, the detected temperature of the tap water temperature sensor, and the flow rate sensor of the hot water supply passage are provided. If the hot water supply capacity calculated from the detected flow rate becomes less than a certain judgment value of the combustion capacity, the bath circulation pump is stopped to wait for the bath reheating, and the hot water supply alone is used, and the hot water supply capacity is controlled. Can be secured.

In the hot water supply single use control state in the bath additional heating standby, the hot water supply capacity calculated from the detected temperature of the hot water supply temperature sensor, the detected temperature of the hot water supply temperature sensor, and the flow rate of the flow rate sensor in the hot water supply passage is the combustion capacity. When it becomes equal to or less than a certain determination value, the bath circulation pump is operated to cancel the bath reheating standby, and the simultaneous operation can be restarted.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention. In the figure, the hot water supply side passes through a water inlet thermistor 1 and a water amount sensor 2 from a water inlet, and is divided into a heat exchanger 3 and a bypass circuit 4. The water is discharged from the hot water outlet through the control valve 5 and the hot water thermistor 6. The gas passes through the main solenoid valve 7 and the gas proportional valve 8 from the gas inlet, is mixed with the air sent by the fan 9, and is burned by the burner 10.

On the bath side, the bathtub water is circulated by the bath circulation pump 11, and the temperature is detected by the bath return thermistor 12, while the heat is shared by the heat exchanger 3 common to the hot water supply side.

Next, along with the flowchart of FIG.
The operation and operation will be described. When the hot water supply is used alone, the target flow rate is calculated from the temperature detected by the water input thermistor 1 and the set temperature of the remote controller for the capacity of the appliance, and the water flow control valve 5 is controlled so as to reach the target flow rate. The amount of combustion is controlled by calculating the FF amount from the flow rate detected by the water amount sensor 2, the incoming water temperature, and the set temperature, and obtaining the FB amount from the detected temperature of the tapping thermistor. When a request for additional heating operation comes here, simultaneous operation control is performed.

In step 100, the bath circulating pump 11 is driven to circulate bath water in the bath-side piping.
In step 1, the temperature TF of the circulating water is detected by the bath return thermistor 12, and in step 102, the amount of heat absorbed on the bath side is estimated from the detected temperature and the circulating flow rate in the bath passage. In step 103, the available capacity on the hot water supply side is obtained by subtracting the amount of heat absorbed on the bath side obtained in step 102 from the maximum capacity of the appliance. calculate. The current flow rate detected by the water flow sensor 2 in step 104 is compared with the target flow rate obtained in step 103. If the current flow rate> the target flow rate, the water flow control valve 5 is driven in step 105, and the current flow rate becomes equal to the target flow rate. Control so that

In this control state, the FF value on the hot water supply side and the heat absorption amount on the bath side are used as the FF value for combustion, and the FB value is obtained from the temperature detected by the tapping thermistor 6 to control the gas proportional valve 8. If the current flow rate ≦ the target flow rate in step 104, the water flow control is not performed, and the simultaneous operation control can be performed by detecting the bath-side circulating water temperature and increasing the amount of heat absorbed by the bath-side heat absorption amount.
As a result, even if the simultaneous operation is performed, it does not occur that the amount of combustion is insufficient and the temperature of hot water is lowered.

Further, the circulating flow rate of the bath circuit can be calculated and learned in a state where the equipment is installed, and the temperature of the bath circulating water is not determined by the temperature of the sensor unit in the equipment, but the water in the bathtub is circulated by circulating a pump. Therefore, simultaneous operation control suitable for actual bathtub temperature conditions can be performed.

In this embodiment, there is no fluctuation in the hot water temperature and the simultaneous operation is possible up to the capacity limit of the appliance, and the simultaneous operation can always be performed. There is a fear that the fluctuation of the flow rate becomes large. When the flow rate variation on the hot water supply side is small, there is no problem in actual use even if the simultaneous operation is performed as it is, but when the flow rate variation is large, a problem may occur in the hot water supply usage state.

On the other hand, in step 106, in the simultaneous operation control state, it is determined whether the control amount of the gas proportional valve 8 is in the maximum combustion control state of the appliance. If the appliance is in the maximum combustion control state, In step 107, the detection flow rate of the water amount sensor 2, the hot water thermistor 6, and the water input thermistor 1
Then, the hot water supply side output is calculated from the detected temperature, and is compared with a reheating standby determination value to determine whether or not the capacity is sufficient for actual use of the hot water supply. If the output of the hot water supply side is smaller than the reheating standby determination value, there is a possibility that a problem may occur in using the hot water supply. Therefore, the process proceeds to step 108, the bath circulation pump 11 is stopped, and the reheating operation is on standby. The hot water supply side performs stand-alone combustion control in the additional heating standby state,
Secure hot water supply capacity. Accordingly, if the flow rate of hot water varies greatly while checking the state of the bath, the bathroom can be put on standby before a large variation occurs. When the capacity of the hot water supply is not affected, simultaneous operation can always be performed, and when the flow rate fluctuation becomes large, the bath reheating can be waited before the flow rate fluctuates greatly so as not to affect the use of the hot water supply.

Further, in the reheating standby state 108,
If the hot water supply usage conditions change and the hot water supply output decreases, the appliances may be able to operate simultaneously at the same time. I have not done it. On the other hand, even during the additional heating standby 108, the hot water supply side output is calculated from the detected flow rate of the water amount sensor 2 and the detected temperatures of the hot water thermistor 6 and the incoming water thermistor 1, and it can be used simultaneously in step 109 under any bath conditions. When the hot water supply side output becomes equal to or less than the determination value, the simultaneous operation is restarted. Thereby, simultaneous operation control using the capability of the appliance as much as possible with respect to the load fluctuation on the hot water supply side can be performed.

[0022]

As is apparent from the above description, the bath water heater according to the first aspect of the present invention calculates the available water supply capacity when receiving a hot water supply request and a reheating request at the same time, and calculates the capacity. By controlling the flow rate in this manner, there is an effect that the simultaneous operation can always be performed without causing a change in the hot water temperature.

Further, the bath water heater according to the second aspect of the present invention calculates the appliance combustion state in the simultaneous operation control state and the output of the hot water supply side. Since the control to make the reheating operation stand by is performed, there is an effect that the simultaneous operation can be performed as much as possible by maximizing the capability of the appliance.

Further, the bath water heater according to claim 3 detects the fluctuation of the hot water supply capacity even in the additional heating standby state and judges and controls whether the equipment can be simultaneously operated. This has the effect of maximizing the capacity and enabling simultaneous driving as much as possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a bath water heater in Embodiment 1 of the present invention.

FIG. 2 is a flowchart in the bath water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet water thermistor 2 Flow rate sensor 3 Heat exchanger 4 Bypass circuit 5 Water quantity control valve 6 Water supply thermistor 7 Gas source solenoid valve 8 Gas proportional valve 9 Fan 10 Burner 11 Bath circulation pump 12 Bath return thermistor

Continued on the front page F term (reference) 3L024 CC06 DD04 DD13 DD14 DD17 DD22 DD27 EE12 EE16 GG03 GG04 GG05 GG06 GG24 HH02 HH06 HH14 HH27

Claims (3)

[Claims] 1. A common heat exchanger for hot water supply and bath reheating,
A combustion section for heating the heat exchanger; a hot water supply request; combustion control means for controlling combustion in the combustion section in response to a bath reheating request; and a water supply temperature sensor for detecting a water supply temperature in the water supply passage. , A heat exchanger temperature sensor for detecting a heat exchanger temperature, a tapping temperature sensor for detecting a hot water supply temperature, a flow rate sensor for detecting a flow rate of a hot water supply passage, a bypass passage for bypassing the heat exchanger, and a water flow control for controlling a hot water supply flow rate. A valve, and a bath circulation pump for circulating water in the bath tub to perform reheating combustion and a bath temperature sensor for detecting the temperature of the bath water in the bath passage, and receive a hot water supply request and a reheating request at the same time. When the bath circulation pump is driven, the amount of heat absorbed on the bath side is calculated from the temperature detected by the bath temperature sensor, and a value obtained by subtracting the amount of heat absorbed from the bath from the maximum capacity of the appliance can be used for hot water supply. The hot water flow rate is calculated as a force to control the flow rate by the water volume control valve, a bath water heater equipped with a co-operation control means for simultaneous operation of the hot water supply and Tsui焚. In the simultaneous operation state controlled by the simultaneous operation control means, when the appliance is performing maximum combustion control, the hot water supply capacity calculated from the water supply temperature, the tap water temperature, and the flow rate of the hot water supply passage has a certain determination value. The bath water heater according to claim 1, wherein when the temperature becomes below, the bath circulation pump is stopped to wait for reheating of the bath, and the hot water supply is used alone. 3. In the hot water supply single use control state in the bath additional heating standby, if the hot water supply capacity calculated from the water supply temperature, the hot water supply temperature and the flow rate of the hot water supply passage falls below a certain judgment value, the bath circulation pump is turned off. 3. The bath water heater according to claim 2, wherein the moving water bath cancels the standby for reheating and restarts the simultaneous operation.