JPH02136647A - Hot water supply apparatus with bath hot water supply function - Google Patents

Abstract

PURPOSE:To prevent the danger of supplying high temperature water during hot water supply operation after additional high temperature water supply operation by a method wherein a certain amount of water in a hot water supply pipe is discharged into a bath after additional high temperature water supply operation. CONSTITUTION:When a pre-determined amount of additional high temperature water is delivered and the additional high temperature supply operation is completed, combustion of a burner 3 is stopped and automatic hot water supply flow sensor 16 starts to count again. This count after stoppage of combustion is to count the amount of water to be discharged, and after the combustion of the burner 3 is stopped, an automatic bath hot water supply valve 15 is still kept open to discharge the high temperature water retained in a heat exchanger 5, common hot water supply pipes 6 and 8, a hot water storage tank 7 and an automatic hot water supply pipe 9 into a bath 11. When the count of the automatic hot water supply flow sensor 16 exceeds a specified value, the automatic bath hot water supply valve 15 and a mixing valve 20 is closed by a controller 30. Then, the mixing valve 20 is opened until the count of the automatic hot water supply sensor 16 reaches a certain value, and water from a water supply pipe 4 is mixed with the high temperature water in a common hot water supply pipe 10 so as not to supply the residual high temperature water from the common hot water supply pipe.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a water heater with a bath water supply function.

<Conventional technology: A water heater that can automatically supply bath water in addition to general hot water supply,
The automatic bath hot water supply function is a normal bath hot water supply (for example, 3
Conventionally, water heaters have been provided that have a function of supplying high-temperature water of, for example, 80°C, in addition to the function of supplying hot water at 80°C. This water heater can raise the temperature of the bathtub by using the high-temperature hot water, so it has the advantage of producing the same effect as reheating.

<Problems to be Solved by the Invention> However, in the above-mentioned water heater capable of pouring hot water, there is a problem that hot water remaining in the water heater comes out during general hot water supply after hot hot water pouring is finished. . For this reason, the present applicant opened the passage valve to the bathtub for a certain period of time after the high-temperature hot water supply was finished, and drained the remaining high-temperature water in the water heater into the bathtub. However, with this method, high-temperature water may remain in the water heater even after a predetermined period of time has passed due to water pressure fluctuations in the hot water supply passage, and high-temperature water may still be discharged at the beginning of the next regular hot water supply. There was a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a water heater with a bath hot water supply function that can eliminate the drawbacks of the prior art described above and reliably prevent hot water from being discharged during the next normal use after hot water has been poured.

Means for Solving the Problems〉 The water heater with a bath hot water supply function of the present invention has the following features: The bath water heater is configured to branch out, and has a bath hot water supply function capable of supplying high-temperature hot water to the bathtub in addition to normal bath water supply, and after the end of the high-temperature supply operation, The hot water supply system is characterized in that a certain amount of hot water in the hot water supply system is discarded into the bathtub.

Function: After the high-temperature pouring hot water operation is completed, the hot water in the hot water supply system is discarded into the bathtub at a constant flow rate.
For example, by obtaining the maximum amount of high-temperature water that can remain in the hot water supply system in advance as the constant flow rate through experiments or the like, it is possible to reliably prevent the risk of high-temperature water coming out during hot water supply after hot water is poured.

<Embodiment> FIG. 1 is an overall configuration diagram of a water heater with a bath hot water supply function showing an embodiment of the present invention, and FIG. 2 is a control flowchart from the high temperature pouring hot water operation to the completion of discarding hot water by the control unit.

In FIG. 1, a water heater 1 is equipped with a heat exchange can body 2 and its burner 3, and water is passed through an inlet pipe 4 to the heat exchange can body 2.
The water entering the tank is heated by a heat exchanger 5, and once enters a semi-hot water storage tank 7 via a common hot water supply pipe 6. After passing through a common hot water supply pipe 8 from the semi-hot water storage tank 7, it branches into an automatic bath water supply pipe 9 and a general hot water supply pipe 10. The bath automatic hot water supply pipe 9 is connected to the bathtub 11. Further, the general hot water supply pipe IO is connected to a hot water supply line in a kitchen or the like (not shown). The water inlet pipe 4 is provided with an inlet water flow rate sensor 12 and an inlet water temperature sensor 13, and the common hot water supply pipe 8 is provided with a water flow rate regulator 14.

In addition, the bath automatic hot water supply pipe 9 includes a bath automatic hot water supply valve 15, an automatic hot water supply flow rate sensor 16, a check valve 17, and a vacuum breaker 1.
8 is provided. Of course, the automatic bath water supply pipe 9 may be provided with a temperature sensor for feed bank control. A check valve 19 is provided in the general water supply pipe 10. Further, a mixing valve 20 for mixing is provided from the water inlet pipe 4 to the general hot water supply pipe 10. 21, 22, 23 are drain pipes.

30 is a control unit with a built-in microcomputer, which inputs commands from the remote controller 4o, and inputs information from the incoming water flow rate sensor 12, incoming water temperature sensor 13, automatic hot water supply flow rate sensor 16, etc.
In accordance with a predetermined program, predetermined operating signals are output to the burner 3, water flow rate regulator 14, valves 15, 20, etc. In addition to the main operation switch, the remote controller 40 is provided with an automatic bath water supply switch, a hot water supply switch, a bath automatic hot water supply temperature setting section, and the like.

If you want to perform automatic bath water supply now, set the automatic hot water temperature and press the automatic hot water switch to open the solenoid on-off valve 1.
5 is opened, the required amount of heating heat is calculated from the incoming water flow rate measured by the incoming water flow rate sensor 12, the incoming water temperature measured by the incoming water temperature sensor 13, and the set hot water supply temperature, and the burner 3 is operated with the corresponding combustion amount.

Next, the case where hot water pouring operation is performed will be explained with reference to FIG. 2 as well.

Now, when the hot water supply switch is turned on using the remote controller 40, the bath automatic hot water supply valve 15 and the mixing valve 20 are opened (
Step (a)). The mixing valve 20 is opened because
The purpose is to prevent high-temperature hot water from being discharged to the general hot water supply side when general hot water is being supplied at the same time as hot water is being poured.

When the bath automatic hot water supply valve 15 is opened, water flows into the water inlet pipe 4, so that combustion of the burner 3 is started and the burner 3
The required combustion amount is calculated (step (b)). This required combustion amount is calculated in the microcomputer of the control unit 30 based on a predetermined hot water temperature or a set high temperature hot water temperature (e.g. 80°C), the water inlet temperature measured by the water inlet temperature sensor 13, and the inlet water temperature. This is done by calculating the required amount of heating heat from the incoming water flow rate measured by the flow rate sensor 12, and further calculating the required combustion amount from the required amount of heating heat. Based on this, the amount of fuel supplied and the amount of air blown to the burner 3 per unit time are controlled by the control unit 30. During operation, combustion control is performed so that the temperature of the high-temperature hot water is maintained at a predetermined temperature.

Then, when a predetermined amount of high-temperature hot water is poured, or when the high-temperature pouring operation is manually stopped and the operation is completed (step (c)), combustion of the burner 3 is stopped,
The automatic hot water supply flow rate sensor 16 starts counting again (
step (d)). This count after combustion stops is to count the amount of discarded hot water. That is, even if combustion in the burner 3 is stopped, the bath automatic hot water supply valve 15 is kept open to drain the residual high temperature water in the heat exchanger 5, the common hot water supply pipe 6.8, the semi-hot water storage tank 7, and the bath automatic hot water supply pipe 9. When the water is poured into the bathtub 11 and the count of the automatic hot water supply flow rate sensor 16 reaches a certain level (step (e)), the bath automatic hot water supply valve 15 and the mixing valve 20 are closed via the control unit 30 (step (e)). The reason why the mixing valve 20 is kept open until the automatic hot water supply flow rate sensor 16 reaches a certain count even after the high-temperature pouring operation is finished is that even if general hot water is being supplied during that time, the water from the inlet pipe 4 to the general hot water supply pipe IO is kept open. This is to prevent the remaining high-temperature water from being mixed and being used for general hot water supply.

The flow rate counted by the automatic hot water supply flow rate sensor 16 can be determined, for example, by the maximum amount of hot water that can remain in the hot water supply line from the heat exchanger 5 to the automatic hot water supply flow rate sensor 16. The flow rate of the vortex may be increased or decreased depending on the set temperature of the high-temperature pouring hot water or the combustion time of the burner 3 during the high-temperature pouring.

<Effects> The present invention has the above-described configuration, and is configured so that the subsequent discarding of hot water after the end of high-temperature pouring operation is performed not by time but by flow rate, so that the flow rate per unit time due to fluctuations in water pressure etc. Even if there is a major change in hot water, the predetermined flow rate can be reliably discarded, and the risk of residual high-temperature water suddenly coming out during general hot-water supply after high-temperature pouring operation is therefore ensured. prevention and safety.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a water heater with a bath hot water supply function showing an embodiment of the present invention, and FIG. 2 is a control flowchart from a high-temperature pouring hot water operation to completion of discarding hot water by the control section. 1: Water heater 2: Heat exchange can 3: Burner 4: Water inlet pipe 5: Heat exchanger 6.8: Common hot water pipe 7: Semi-hot water storage tank 9: Bath automatic hot water pipe 10 d General hot water pipe ll: Bathtub 16: Automatic hot water supply flow rate sensor 30: Control unit 40: Remote control Figure 1

Claims (1)

[Claims] (1) The hot water supply system for general hot water supply and the hot water supply system for bath hot water supply are constructed so that they are branched after passing through the same hot water supply system including a heat exchanger, and the hot water supply system for bath water is connected to the normal bath hot water supply system. In addition, a water heater with a bath hot water supply function is equipped with a function of pouring hot water into a bathtub, and after the high temperature pouring operation is finished,
A water heater with a bath hot water supply function, characterized in that the hot water in the hot water supply system is drained into the bathtub by a constant flow rate.