JPH0697119B2 - Hot water supply device with bath hot water supply function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention has a normal hot water supply function for supplying general hot water to a kitchen and other places, as well as a bath water temperature setting for a bath water heater. The present invention relates to a hot water supply device with a bath hot water supply function, which is capable of automatically switching to settings and supplying hot water.

<Prior Art> In this type of hot water supply device, the hot water supply side burner of the water heater is turned on / off by the on set temperature and the off set temperature to adjust the hot water temperature to the set temperature, and the hot water is supplied to the bathtub by the drop method. There is something. In this water heater, the drop shift temperature T ₁ and the hysteresis temperature T _H1 at the time of dropping are set according to the bath-side temperature control set temperature T _FS , and then the OFF set temperature T _OFF of the hot water supply side burner is set to T _FS −T ₁ , ON set temperature T _ON
Is set as T _OFF −T _H1 to control the hot water temperature.

The reason for setting the temperature like this is that this type of hot water supply device is generally a semi-hot water storage type, so high-temperature water of approximately 80 ° C may remain in the hot water storage tank before it is dropped. This is because high temperature water may enter the bathtub and it is dangerous. In addition, because there are differences in the characteristics of the bath-side temperature sensor and the hot-water supply side temperature sensor that mainly use thermistors, and there are variations in the characteristics of the heat exchanger, the hot water temperature is shifted to the lower side and dropped to ensure safety. I am trying to

<Problems to be solved by the invention> However, if hot water is simultaneously used in the kitchen while hot water is being dropped into the bathtub, the heat exchange efficiency changes as the amount of water changes, and as a result, The temperature on the bath side will be considerably lower than the set temperature, and the reheating time by the burner on the bath side will be long thereafter.If water retention starts during bathing, the bath temperature will drop temporarily. It gives a pleasant feeling.

<Purpose> The present invention solves the above drawbacks of the prior art, and even when the hot water is supplied to the kitchen or the like during bath hot water supply, even if the hot water flow rate changes due to simultaneous use, the drop hot water temperature is set to the bath side temperature control. An object of the present invention is to provide a hot water supply device with a bath hot water supply function that can maintain the temperature.

<Means for Solving Problems> The present invention is directed to a combustion OFF set temperature T _OFF and an ON set temperature T _ON.
A hot water supply device with a bath hot water supply function that can automatically supply hot water to the bathtub 1 in addition to the hot water supply function to the kitchen etc. by the hot water supply side burner 9 which is controlled to be turned on and off by providing a hysteresis temperature T _H1 between Te, until it reaches the bathtub water level it is possible to detect the bath temperature by the bath side temperature sensor 6 enables driving of the circulating pump 4 for circulating bath water bath off set temperature T _oFF of the hot water supply side burner 9 Side temperature control set temperature T
Set lower than _FS by shift temperature T ₁ (T _OFF =
T _FS −T ₁ ) to supply hot water to the bathtub 1 and to drive the circulation pump 4 for circulating the bath water so that the bath temperature can be detected by the bath side temperature sensor 6 After reaching, the detected temperature FT _H is the initial OFF set temperature (T _OFF = T _FS −T ₁ ) according to the detected temperature FT _H of the bath side temperature sensor 6 obtained by driving the circulation pump 4.
If it is less than the above, the OFF set temperature T _OFF is raised by a constant temperature, and the detected temperature FT _H becomes the initial OFF set temperature (T _OFF = T _FS
-T ₁ ) or higher and less than the bath-side temperature control set temperature T _FS (T _FS -T ₁ ≤ FT _H <T _FS ), the OFF set temperature T _OFF
Was continued while the initial off-set temperature T _FS -T _1, and the detected temperature FT _H is a feature in that a controller 14 for turning off the burner 9 in the case of more than the set temperature T _FS bath side temperature control There is.

<Operation> Since the controller 14 lowers the _OFF set temperature T _OFF of the hot water supply side burner 9 by the drop shift temperature from the bath side temperature control set temperature T _{FS at the} initial stage of dropping into the bathtub 1, the drop is performed. Even if there is residual high-temperature water, it is possible to prevent the bath from being filled with hot water that exceeds the set temperature. After reaching the bathtub water level at which the bathtub water level is midway and the circulation pump 4 can be driven and the bath temperature sensor 6 can detect the bath temperature, the controller 14 brings the detected bath temperature to the bathtub level. Turn off the burner 9 depending on the
Since T _OFF is changed up and down while dropping is performed, even if simultaneous hot water supply to the kitchen etc. is used, the bath-side temperature control set temperature T _FS will be reached when the prescribed set drop water level is reached. It is possible to complete the drop without making a big difference.

<Examples> Hereinafter, preferred examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of an embodiment of the present invention, in which 1 is a bathtub, 2 is a bath side heat exchanger, 3 is a bath side burner for additional heating, 4 is a bathtub 1 and a heat exchanger. Each of the circulation pumps provided in the circulation path 5 between the two is shown, and hot water is forcibly circulated by driving the circulation pump 4. The circulation path 5 is provided with a bath-side temperature sensor 6 including a thermistor for detecting the temperature of the hot water in the bathtub 1, and the water level in the bathtub 1 is equal to or higher than a predetermined value at which the circulation pump 4 can be driven. An empty water heating prevention switch 7 for detecting flutter is provided.

On the other hand, a hot water supply side heat exchanger 8 and a hot water supply side burner 9 are provided on the hot water supply side to supply general hot water to the kitchen and other places. Further, hot water is supplied from the heat exchanger 8 through the hot water supply pipe 11 having the drop valve 10 to the drop port 12 of the bath side heat exchanger 2 by the drop method. And
The hot water supply side heat exchanger 8 is also provided with a hot water supply side temperature sensor 13 composed of a thermistor, and the temperatures detected by the temperature sensor 13 and the bath side temperature sensor 6 are input to a controller 14 composed of a microcomputer to further prevent the water heating. The detection signal of the switch 7 is also input to the controller 14. Also,
The burners 3 and 9 and the circulation pump 4 are driven and controlled by the controller 14. The remote controller 15 is not shown,
The controller consists of a bath-side temperature control setter, a hot water supply side temperature control setter, an automatic switch and a hot water supply switch.
On the other hand, when the temperature is set and the hot water supply switch is turned on, normal hot water is supplied, and when both the hot water supply switch and the automatic switch are turned on, hot water is automatically supplied to the bathtub 1.

Next, the operation of the above embodiment will be described with reference to FIGS. First, the case of normal hot water supply will be described. When only the hot water supply switch of the remote controller 15 is turned on,
In the flowchart of FIG. 2, it is determined to be YES in flow [A] and NO in flow [B], and the flow proceeds to step [K]. That is, the hot water supply side temperature adjustment set temperature T _QS is input to the controller 14 from the hot water supply side temperature adjustment setting device of the remote controller 15 and the detected temperature QT _H of the hot water supply side temperature sensor 13
Is also input to the controller. And the hot water supply side burner 9
OFF set temperature of T _OFF = T _QS , ON set temperature T _ON = T _OFF
It is set as the -T _H2. [Flow (L)] The above-mentioned T _H2
Is a hysteresis temperature during hot water supply, which is determined based on the burner 9 and hot water discharge characteristics. When the OFF set temperature T _OFF and the ON set temperature T _ON are set in this way, the ON set temperature T _ON is compared with the detected temperature QT _H of the temperature sensor 13 [flow (G)], and the detected temperature QT _H If it is lower, the hot water supply side burner 9 is turned on [Flow (J)], and the flow returns to Flow [A] again to proceed to the same steps.

When the burner 9 is turned on, the hot water temperature rises and the set temperature T _ON
When it becomes higher, the flow (H) is stepped and compared with the _OFF set temperature T _OFF, and the detected temperature QT _H is set to the OFF set temperature T _OFF.
Repeat the same steps back to the flow (A) to be higher, the burner 9 is turned off when the detected temperature QT _H is higher than the off-set temperature T _OFF [Flow (I)].
After that, the burner 9 is controlled to be turned on and off by repeating the same operation, and the hot water temperature is maintained at the set temperature T _QS .

Figure 3 is shows the detected temperature QT _H during the aforementioned normal hot water, T ₁ o'clock and T ₃ at the detected temperature QT _H is the burner 9 reaches the off set temperature T _OFF are turned off, T ₂ during detection It shows a state in which the temperature QT _H falls below the _ON set temperature T _ON and the burner 9 is turned on.

Next, the control operation of the bath hot water supply by the controller 14 will be described. When both the hot water supply switch and the automatic switch of the remote controller 15 are turned on, YES is determined in the flow (B), and the process proceeds to the flow (C). .
That is, the bath side temperature adjustment setting from the bath side temperature adjustment setter temperature T _FS of the remote control 15 is input to the controller 14, the detected temperature QT _H of the hot water supply side temperature sensor 13 is also input to the controller 14, it dropped into the controller 14 The valve 10 is turned on and the dropping operation is started. At the initial stage of dropping, the water level of the bathtub 1 is equal to or lower than the predetermined value and the dry heating prevention switch 7 is in the off state. Set the temperature T _OFF = T _FS -T ₁ and set the _ON temperature T _ON = T _OFF -T _H1 in the controller 14 [Flow (F)]. still,
The above-mentioned T _H1 is a hysteresis temperature at the time of dropping, and is determined by the hot water tank capacity, the burner 9 and the hot water discharge characteristics. Then, if the OFF temperature T _OFF and the ON temperature T _ON are set, they are compared with the detected temperature QT _H in the flow (G) and the flow (H), respectively, and the burner 9 is turned on similarly to the case of normal hot water supply. Controlled off.

When the water level in the bathtub 1 reaches a predetermined value, the water heating prevention switch 7 is turned on to drive the circulation pump 4 [flow (M)], and the temperature FT _H detected by the bath side temperature sensor 6 is input to the controller 14. Flow (N)], this is T _FS
-T _1, that is, OFF set temperature T _{OFF is} compared [Flow (O)]. At this time, if FT _H <T _FS −T ₁ , set T _OFF = T _FS [Flow (P)]. That is, the OFF set temperature T _OFF is raised by a constant value and set. As a result, the burner 9 is prevented from falling due to the change in flow rate due to simultaneous use. On the other hand, if T _FS −T ₁ ≦ FT _H <T _FS , the detected temperature FT _H is compared with the bath-side temperature adjustment set temperature T _FS without changing the setting of _OFF set temperature T _OFF = T _FS −T _1. Flow (Q)], if FT _H ≧ T _FS , turn off burner 9 and set bath 1
Correct the hot water temperature so that it will reach the temperature setting temperature T _FS when the temperature is completely dropped.

Figure 4 shows the detected temperature FT _H bath side temperature sensor 6 in the above operation, t1 indicates the period set as T _OFF = T _FS, t2 and t4 is set to T _OFF = T _FS -T ₁ Indicates the period of Further, t3 is a period in which the burner 9 is off.

<Effect> In the initial stage of dropping into the bathtub 1, since the OFF set temperature T _OFF of the hot water supply side burner 9 is lowered by the drop shift temperature from the bath temperature control set temperature T _FS , the remaining high temperature water is dropped. Even if there is, it is possible to prevent the bathtub from being filled with hot water exceeding the set temperature. Then, after reaching the bathtub water level where the bathtub water level is midway and the circulation pump 4 can be driven and the bath temperature sensor 6 can detect the bath temperature, the burner 9 is set according to the detected bath temperature. Or turn off the burner 9 set temperature
Since T _OFF is changed up and down while dropping is performed, even if simultaneous hot water supply to the kitchen etc. is used, the bath-side temperature control set temperature T _FS will be reached when the prescribed set drop water level is reached. It is possible to complete the drop without making a big difference. Therefore, the subsequent heating is unnecessary or can be done in a very short time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
The flow chart of the figures, FIG. 3 and FIG.
It is a figure which shows the detected temperature at the time of normal hot water supply of the figure, and automatic hot water supply to a bath. 1: Bathtub 4: Circulation pump 6: Bath temperature sensor 9: Hot water supply burner 13: Hot water supply temperature sensor 14: Controller

Claims (1)

[Claims] Claims: Combustion OFF set temperature T _OFF and ON set temperature T
A hot water supply device with a bath hot water supply function that can automatically supply hot water to the bathtub 1 in addition to the hot water supply function to the kitchen, etc. by the hot water supply side burner 9 that is controlled to be turned on and off by providing a hysteresis temperature _TH1 between _ON and OFF. Therefore, the OFF set temperature T _OFF of the hot water supply side burner 9 is set until the bath water level is reached at which the circulation pump 4 for circulating the bath water can be driven and the bath temperature can be detected by the bath temperature sensor 6. Bath side temperature control set temperature
Drop temperature T ₁ lower than T _FS (T _OFF
= T _FS −T ₁ ) to supply hot water to the bathtub 1 and to drive the circulation pump 4 for circulating the bathwater so that the bath temperature sensor 6 can detect the bath temperature. After reaching the temperature, the detected temperature FT _H is the initial OFF set temperature (T _OFF = T _FS −) according to the detected temperature _F TH of the bath side temperature sensor 6 obtained by driving the circulation pump 4.
If it is less than T ₁ ), the OFF set temperature T _OFF is raised by a certain temperature, and the detected temperature FT _H becomes the initial OFF set temperature (T _OFF = T
_FS- T ₁ ) or more and less than the bath-side temperature control set temperature T _FS (T _FS T ₁ ≤ FT _H <T _FS ), the off set temperature T _OFF
And wherein the the continuously remains of the initial off-set temperature T _FS -T _1, and the detected temperature FT _H is in the case of more than the set temperature T _FS bath side temperature control in which a controller 14 to turn off the burner 9 A hot water supply device with a bath hot water supply function.