JPH06100371B2 - Bath hot water supply method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bath with a bath water heater provided with a water heater for dropping a predetermined amount of hot water or water into a bathtub and a bath hot water circulation heater for reheating the hot water. It concerns hot water supply methods.

(Prior Art) Conventionally, in a bath water heater that drops a predetermined amount of hot water into a bathtub, a method of measuring the amount of hot water dropped from the water heater into the bathtub by a flow rate sensor, and stopping the dropping when a preset predetermined amount is detected The method of setting the bath water level in advance by using the or water level switch was adopted. However, the former method has a drawback that the desired water level is exceeded when there is residual hot water in the bathtub, and the latter method requires a water level switch to be attached to the bathtub, which requires time and effort for wiring work and adjustment. In particular, when the main body of the device is installed at a remote location from the bathtub, there is a concern that the wiring may be broken or the electric leakage may occur, which makes repair and inspection extremely complicated.

Therefore, the applicant of the present application first calculates the amount of hot and cold water at that time based on the heating time required to heat the residual hot water in the bathtub with the bath hot water circulation heater and raise the temperature by a certain amount, and calculate the calculated amount and the amount in advance. We proposed a bath hot water supply method that replenishes hot and cold water in an amount corresponding to the difference from the set predetermined amount.

(Problems to be Solved by the Invention) In this prior art, the hot water temperature is detected by a temperature sensor provided in a circulation path connecting the bath hot water circulation heater and the bath.
As shown in FIG. 3, the amount of hot water at that time is calculated based on the time t required until the detected temperature rises from T1 by a constant temperature ΔT to reach T1 + ΔT. Since the hot water is not completely agitated, the hot water temperature becomes non-uniform, and as shown in the figure, the change in the detected hot water temperature is not linear but shows an unstable rate of increase. There was a problem that the accuracy of the calculation of the amount of hot water deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a bath hot water supply method capable of accurately calculating the amount of hot and cold water in a bathtub and thus dropping a predetermined amount of hot and cold water into the bathtub.

(Means for Solving Problems) In order to achieve the above object, the present invention has the following configuration. That is, in a bath water heater equipped with a water heater that drops hot and cold water into the bathtub through the drop pipe, a water amount sensor provided in the drop pipe, and a bath hot water circulation heater that reheats the hot water in the bathtub During automatic hot water supply that stores a fixed amount of hot and cold water, the heating time required to heat the hot and cold water stored in the bathtub with the bath hot water circulation heater to raise the temperature to a certain level is measured, and the amount of heating heat is calculated based on this heating time. Calculate the integrated value of the temperature change during that, calculate the temperature rise value for calculation by dividing the integrated value by the heating time to calculate the amount of hot and cold water in the bath from the heating heat amount and the temperature rise value for calculation, An amount of hot water corresponding to the difference between the predetermined amount set in advance and the calculated amount of hot water is supplied from the water heater.

(Example) FIG. 1 shows a bath water heater according to the present invention, in which (1) is a bath water heater and (2) is a bathtub. Bath water heater (1)
Includes a water heater (3) and a bath water circulation heater (4), and the water heater (3) controls the heat exchanger (31), the burner (32), and the fuel supply amount to the burner (32). It consists of a proportional control valve (33), a temperature sensor (34) that detects the incoming water temperature, a flow rate sensor (35) that detects the incoming water amount, etc., while the bath water circulation heater (4) returns to the forward pipe (5) and return. It communicates with the bathtub (2) through the pipe (6), the forward pipe (5) has a temperature sensor (51), the return pipe (6) has a flow sensor (8), a pump (9), and a temperature sensor ( 10) is provided. (41) is a heat exchanger of the bath water circulation heater (4), (42) is a burner, and (43) is a fuel valve provided in the fuel supply passage of the burner (42). (11)
Is a hot water supply pipe that connects from the outlet of the heat exchanger (31) of the hot water supply device (3) to the hot water tap (12) provided at any hot water supply location, and (13) is a branch from the middle of the hot water supply pipe (11) Is a drop pipe facing the open-air tank (14), and a flow sensor (15), a water amount control valve (16), and a solenoid valve (17) are interposed in the drop pipe (13). The tank (14) is connected to the return pipe (6) via a three-way switching valve (18).
Reference numeral (7) is a bypass pipe that branches from the downstream side of the pump (9) of the return pipe (6) and connects to the upstream side (tub side) of the three-way switching valve (18). It is provided. (19) is a water level switch for the tank (14), (20) is a check valve, and (21) is a bus adapter. (22) is a controller that controls various functions of the bath water heater (1), (23) is a remote controller installed in the bathroom, and the remote controller (23) has a power switch (24) and a bath automatic switch (25). , A hot water supply temperature setting knob (26), a bath heating switch (27), a bath temperature setting knob (28), and a bath hot water supply amount setting knob (29) are provided.

The action of automatic hot water supply to the bathtub (2) will be described with reference to the action explanatory diagram of FIG. When the desired hot water amount (VS) to be stored in the bathtub (2) is preset by the bath hot water supply volume setting knob (29) and the bath automatic switch (25) is turned on, first, the forward pipe (5) and the return pipe (6) Air purging in the circulation path composed of the bath hot water circulation heater (4) is performed. That is, the pump (9) is operated with the three-way switching valve (18) on the tank (14) side,
A certain amount (for example, 10 liters) of hot and cold water is dropped from the water heater (3), the water is circulated to the bath hot water circulation heater (4) and the outward pipe (5), the bypass valve (71) is opened, and the bypass pipe (7) is opened. Water is also passed through the return pipe (6). In this way, the air in the circulation path is discharged. Next, it is judged whether or not there is residual water at a water level equal to or higher than the bath adapter (21) in the bathtub (2). That is, the bypass valve (71) is closed, the three-way switching valve (18) is switched to the circulation path side, and the circulation flow rate is detected by the flow rate sensor (8) for a certain period of time (for example, 30 seconds). Is below a predetermined flow rate. If it is determined that there is no residual water, perform primary pouring. That is, half the preset desired amount of hot water (VS) is dropped from the water heater (3) so that the water level in the bathtub (2) is above the bath adapter (21). Incidentally, in the primary pouring, regardless of the setting of the hot water supply temperature setting knob (26), hot water having a temperature lower than the set temperature (TS) of the bath temperature setting knob (28) is dropped.
Then, in order to calculate the amount (V) of hot and cold water in the bathtub (2) at this time, the hot and cold water in the bathtub (2) is circulated and heated by the bath hot water circulation heater (4). In this embodiment, the temperature sensor (1
(0) heats until the set temperature (TS) is detected, and the actual hot water amount (V) is calculated based on various measured values during the constant temperature rise (ΔT) immediately before the set temperature (TS). ing. That is, the temperature sensor (10) is T = TS-ΔT
The heating time (t) is measured from the time when the temperature is detected to the time when T = TS is detected and the temperature is detected by the temperature sensor (10) and the temperature sensor (51).
Temperature (TF) and the flow rate per unit time (Q) detected by the flow rate sensor (8) are measured, and the integrated value calculation of the temperature rise and the heating calorific value of the bath water circulation heater (4) described later are calculated. Then, the current hot water amount (V) is calculated.

The calculation of the integrated value of the temperature rise will be described. As shown in FIG. 4 (A), the hot water temperature (T) is measured at every sampling time (ΔT). For example, the measured value at the time (tn) is changed to the time (tn + 1). ), The integrated value F (n) of the temperature rise up to the measured value is Calculated by Note that f (t) is a functional expression of temperature rise and time between the nth and (n + 1) th measured values. In this way, when the integrated values of the temperature rise obtained for each sampling are summed, the integrated value ΣF (n) of the temperature rise from T = TS-ΔT to T = TS is obtained. Here, since the temperature rise is non-uniform as shown in FIG.
(N) is utilized for homogenization. That is, the fourth
The temperature rise value ΔT ′ when the temperature rises uniformly as shown in FIG. Becomes This ΔT 'is a calculation temperature rise value used for calculating the present hot water amount (V).

Next, the calculation of the heating heat quantity of the bath hot water circulation heater (4) will be described. As described above, in addition to the temperature (T) of the temperature sensor (10), the temperature (TF) of the temperature sensor (51) and the flow rate sensor (8).
Flow rate (Q) is measured at the same time, for example, time (tn)
The heating output (Gn) per unit time at that time is Gn = (TFn-Tn) Qn, where Tn, TFn, and Qn are the measured values at each sampling point. The value () is obtained, and this value is multiplied by the heating time (t) to calculate the heating amount (.t).

The actual amount of hot water (V) is calculated from the above-mentioned temperature rise value for calculation (ΔT ′) and the amount of heating heat (· t), Becomes The present hot water amount (V) thus calculated is compared with a preset desired hot water amount (VS), and hot water of an amount corresponding to the difference is dropped from the water heater (3) (secondary pouring). When the current hot water amount (V) is equal to or larger than the desired hot water amount (VS), the automatic hot water supply is finished. By the way, the secondary pouring is set temperature (TS)
However, in consideration of the natural cooling of the bath water during that time, in this embodiment, the bath water is circulated and heated after pouring to boil up to the set temperature (TS).

As described above, in this embodiment, the heating output per unit time is also measured to improve the accuracy,
The heating output per unit time may be a constant value without being limited to the present embodiment. In short, the present invention corrects the error due to the non-uniformity of the temperature rise of the hot water based on the integrated value of the temperature rise. The calculation is performed by using the calculation temperature rise value, which is eliminated, and the accuracy of the hot water amount calculation is improved.

(Effects of the Invention) The present invention has the following excellent effects. That is, even if there is residual water in the bathtub, hot water is not supplied above the desired water level, and even if the bathtub is at a remote position, there is no disadvantage in construction, inspection, etc., and the amount of hot water in the bathtub is extremely accurate. It can be detected well and a certain amount of hot and cold water can be dropped into the bathtub.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a bath water heater according to the present invention,
FIG. 2 is a flow chart showing an embodiment of the present invention, FIG. 3 is an operation explanatory view showing an increase change in hot water temperature, FIG. 4 (A),
FIG. 6B is an explanatory diagram of integral calculation in the embodiment of the present invention. (1) …… Bath water heater (2) …… Bathtub (3) …… Hot water heater (4) …… Bath water circulation heater (8) …… Flow sensor (9) …… Pump (10) (51) ...... Temperature sensor

Claims (1)

[Claims] 1. A bath water heater provided with a water heater for dropping hot water into a bathtub through a drop pipe, a water amount sensor provided in the drop pipe, and a bath hot water circulation heater for reheating the hot water in the bathtub, During automatic hot water supply to store a specified amount of hot and cold water in the bathtub, measure the heating time required to heat the hot and cold water stored in the bathtub by the bath hot water circulation heater to raise the temperature to a certain level, and based on this heating time, the heating energy To calculate the integrated value of the temperature change during that period, and calculate the temperature rise value for calculation by dividing the integrated value by the heating time to calculate the hot water amount in the bath from the heating heat amount and the temperature rise value for calculation. A bath hot water supply method comprising supplying hot water having an amount corresponding to a difference between the calculated and preset predetermined amount and the calculated hot water amount from a water heater.