JPH09280647A - Hot water feeding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a dangerous condition in which a temperature of fed-out hot water of a general type is rapidly increased from being produced by a method wherein when a set temperature to be in controlling combustion is changed from a first temperature to a second temperature, the temperature is changed from the first temperature to the second temperature in a stepwise manner or continuously. SOLUTION: During operation of a hot water feeding machine, a control circuit discriminates whether or not its operation is in a general type hot water feeding or a hot water feeding for a bath is to be carried out in response to signals obtained from a water feeding temperature sensor 11, a water feeding amount sensor 13, a hot water feeding temperature sensor 15 and a bath water amount sensor 19 and then controls a water amount proportional valve 17 and a hot water solenoid valve 21. In addition, during the hot water feeding operation, a gas proportional valve 27 and a gas solenoid valve 29 are adjusted in order to control combustion at a burner 23. In this case, a first set temperature for feeding bath hot water and a second set temperature for a general hot water feeding are stored in a memory, a set temperature used in control for combustion is determined as the first set temperature during a concurrent application of the bath hot water feeding and the general type of hot water feeding and in turn when only the bath hot water feeding is completed from the concurrent application of use, the set temperature used in the control for combustion is changed from the first set temperature to the second set temperature in a stepwise manner or continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for performing general hot water supply and bath hot water supply from one heat exchanger, and more particularly to control of a set temperature at the end of simultaneous use of general hot water supply and bath hot water supply.

[0002]

2. Description of the Related Art A water heater that supplies general hot water and bath hot water from a single heat exchanger cannot simultaneously provide general hot water and bath hot water at different hot water temperatures. Prohibit (for example, cancel hot water supply in the bath), or use the set temperature for general hot water supply or the set temperature for bath hot water supply at the time of simultaneous use.

In the latter control, it is common to select a lower set temperature during simultaneous use in consideration of safety,
When the simultaneous use is completed, it returns to the set temperature for the operation that is continuing.

At the end of the simultaneous use, if the set temperature to be restored is higher than the set temperature during the simultaneous use, the set temperature naturally rises discontinuously and suddenly. Therefore, especially when the set temperature for general hot water supply is higher than the set temperature for bath hot water supply, and when only the hot water supply for the bath is finished from the state of simultaneous use, the hot water discharge temperature of the general hot water will rise sharply, so A user who has been washing or taking a shower may be surprised by the sudden rise in hot water temperature or may be mistaken for the malfunction of the water heater.

Therefore, an object of the present invention is to prevent a rapid rise in hot water supply temperature at the end of simultaneous use of general hot water and bath hot water in a water heater for performing general hot water supply and bath hot water supply from one heat exchanger. is there.

[0005]

A water heater according to the present invention comprises:
When changing the set temperature used for combustion control from one first temperature to another second temperature, instead of changing the first temperature from the second temperature to the second temperature all at once in a discontinuous manner as in the conventional case, It is characterized in that it is changed continuously or continuously. The gradual or continuous change means that the first temperature to the second temperature are divided into a plurality of steps and are changed one by one, or the first temperature to the second temperature. To a continuous transition at a substantially finite rate. As a result, the set temperature does not change suddenly but gradually changes, so that the hot water outlet temperature of the general hot water supply does not rise sharply.

The above-mentioned stepwise or continuous change of the set temperature may be performed in all cases, but it is not always necessary to do so, and it may be performed only in the following specific cases. That is, the operation may be performed only when the type of operation is changed, such as the start / end of general hot water supply or bath water supply. Alternatively, it may be performed only when the set temperature is changed while using the general hot water supply. Alternatively, it may be performed only when the bath hot water supply is completed during simultaneous use. Further, in any case, it may be performed only when the set temperature is raised. Further, it may be limited only when the set temperature is raised to 60 degrees Celsius or higher.

Further, it may be desirable for the user to make the stepwise or continuous change of the set temperature at a rate of changing 5 degrees in 5 seconds.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of an embodiment of a water heater according to the present invention. As shown in the figure, the water supply pipe 1 is connected to the inlet of the heat exchanger 3, the outlet of the heat exchanger 3 is connected to the hot water supply pipe 5, and the hot water supply pipe 5 is connected to the general hot water supply pipe 7 and the bath hot water supply pipe 9 at the other end. Has branched to. The water supply pipe 1 is provided with a water supply temperature sensor 1 and a water supply amount sensor 13, and the hot water supply pipe 5 is provided with a hot water supply temperature sensor 17 and a water amount proportional valve 17, and
A bath water amount sensor 19 and a hot water solenoid valve 2 are provided in the bath hot water supply pipe 9.
1 is provided. A gas proportional valve 27 and a gas solenoid valve 29 are provided in the gas pipe 25 connected to the gas burner 23.

A control circuit (microcomputer), not shown, responds to a user command from a remote controller, not shown, and the various sensors 11, 13 described above.
Based on the signals from 15 and 19, it is determined whether the general hot water supply is used and whether or not the hot water supply for the bath is performed, and the water volume proportional valve 17 and the hot water solenoid valve 21 are controlled, and the general hot water or the bath hot water is supplied. During this period, the gas proportional valve 27 and the gas solenoid valve 29 are adjusted to control the combustion of the burner 23 so that the hot water supply temperature matches the set temperature.

In this combustion control, when only one of general hot water supply and bath hot water supply is used, the set temperature for the type of operation being performed is naturally used. An example of the type of operation and its set temperature is as follows.

(1) General hot water supply, standby: 60 degrees Celsius (hereinafter,
(“Celsius” is omitted.) (2) Bath hot water Filling and adding: Temperature selected by the user from the range of 38 to 50 degrees Hot water: 80 degrees Hot water: 42 degrees Purge hot water: 42 degrees Here, `` Standby '' means that no hot water is supplied,
"Hot water filling" is to fill the bath with a suitable amount of hot water up to a predetermined water level, "Adding water" is adding a suitable amount of hot water to the bath to raise the water level, and "Sip hot water" is to increase the bath temperature. In order to add hot water in order to reduce the temperature of the water in the bathtub, and to add hot water to lower the temperature in the bathtub. In order to discharge the hot water or the low-temperature water that is stored in the bathtub, it means that hot water having an appropriate temperature is additionally supplied. Although the combustion is not actually performed in the “standby” and the “feed water”, the control circuit uses the above-mentioned value as the dummy set temperature.

In the combustion control when both the general hot water supply and the bath hot water supply are used at the same time, the lower one of the set temperatures of both types of hot water supply described above is selectively used. For example, when the general hot water supply and the hot water supply are simultaneously performed, the set temperature of the general hot water supply of 60 degrees is used. Also, for example, when general hot water supply and hot water filling are performed at the same time,
A hot water filling temperature of 38 to 50 degrees is used.

FIG. 2 shows the flow of processing for determining the set temperature used by the control circuit.

First, it is determined whether it is necessary to change the set temperature to be used (S1). When it is necessary to change the set temperature, typically, when the operation type of the water heater is changed, that is, at the start or end of general hot water supply or bath water supply, the set temperature of the operation before and after that Required if the are different. For example, when the filling is started from the standby state, the set temperature to be used needs to be changed from the standby setting temperature of 60 degrees to the setting temperature of the filling area of 38 to 50 degrees. On the other hand, when the general hot water supply is started from the standby, it is not necessary to change the set temperature to 60 degrees. If there is no need to change the set temperature, this process ends.

When it is necessary to change the set temperature,
Next, it is checked whether the set temperature before the change is less than 60 degrees and the set temperature after the change is 60 degrees or more (S).
2, S3). This check result becomes affirmative only when the bath hot water supply is ended only from the simultaneous use of the general hot water supply and the bath hot water supply (note that only the hot water supply can be changed from the simultaneous use condition of the hot water supply and the general hot water supply). When the hot water supply is completed, purge hot water supply is subsequently performed, and the check result becomes positive at the end of the purge hot water supply). In other cases, the check result becomes negative. If the check result is negative, the use set temperature is switched to the set temperature after being changed at once (S9).

On the other hand, if this check result is positive,
That is, as described above, when only the hot water supply for the bath is finished from the simultaneous use state of the general hot water supply and the hot water supply for the bath, next, 1
Two timers for counting 0 second and 5 seconds respectively are started (S4), and the use set temperature is switched to a temperature obtained by adding 5 degrees to the set temperature before change (S5). After that, when the 5-second counter counts up (that is, 5 seconds elapse from the end of hot water supply in the bath) (S6), the set temperature before use is added to the set temperature by 10 degrees (that is, further 5 degrees). Is added) (S7). After that, the 10 second counter counts up (that is,
After another 5 seconds have elapsed (S8), the use set temperature is switched to the changed set temperature (S9).

In this way, when only the hot water supply for the bath is finished from the simultaneous use state, the use set temperature is not raised all the way to the general hot water supply temperature set temperature of 60 degrees at a time, but is gradually raised by 5 degrees in units of 5 seconds. 10 seconds after going to 60 degrees. Therefore,
Users using general hot water can adjust the mixing faucet to keep the hot water temperature at an appropriate temperature in response to this slow temperature rise, so that they will not feel uncomfortable. . In addition, it will not be mistaken for a malfunction of the water heater.

The specific numerical values used in the above description are merely examples and do not limit the present invention.

[0019]

As described above, according to the present invention,
It is possible to prevent the hot water supply temperature from rapidly increasing at the end of simultaneous use of the general hot water supply and the bath hot water supply.

[Brief description of drawings]

FIG. 1 is a configuration diagram of schematic piping of a water heater according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the flow of processing for determining the set temperature used by the control circuit.

[Explanation of symbols]

 1 Water supply pipe 3 Heat exchanger 5 Hot water supply pipe 7 General hot water supply pipe 9 Bath hot water supply pipe

Front page continued (72) Inventor Takayuki Otani 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Inventor Toru Tsuruta 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Inventor Hiroki Maruyama 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Inventor Kiyotaka Nakano 43-1 Uozakihama-cho, Higashinada-ku, Kobe, Hyogo Nihon Within Yupro Corporation

Claims (14)

[Claims] 1. A water heater for performing general hot water supply and bath hot water supply from one heat exchanger, having a first set temperature for bath hot water supply and a second set temperature for general hot water supply, and During simultaneous use with general hot water, means for determining the set temperature to be used in combustion control to the first set temperature, and after only hot water supply from the bath is completed from the state of simultaneous use,
A water heater comprising means for changing a set temperature used for combustion control from the first set temperature to the second set temperature stepwise or continuously. 2. The method according to claim 1, wherein the first
The water heater having a set temperature lower than that of the second set temperature. 3. The apparatus according to claim 2, wherein the first
The water heater is characterized in that the preset temperature is 60 degrees Celsius or lower and the second preset temperature is 60 degrees Celsius or higher. 4. The water heater according to claim 1, wherein the changing unit changes the set temperature to be used at a rate of 5 degrees in 5 seconds. 5. In a water heater for performing general hot water supply and bath hot water supply from one heat exchanger, the set temperature used for combustion control is the set temperature for general hot water supply during simultaneous use of the bath hot water supply and the general hot water supply. Means to determine different set temperatures, after only bath hot water is finished from the state of simultaneous use,
A water heater comprising means for changing the set temperature used for combustion control from the different set temperature to the set temperature for general hot water supply stepwise or continuously. 6. The water heater according to claim 5, wherein the different set temperatures are lower than the set temperature for the general hot water supply. 7. A water heater that performs general hot water supply and bath hot water supply from a single heat exchanger, and means for detecting that only the bath hot water supply has ended from the state where the bath hot water supply and the general hot water supply are in use at the same time, In response to the detecting means, the preset temperature used for combustion control is changed stepwise or continuously from the first preset temperature for the simultaneous use to the second preset temperature for the general hot water supply. A water heater provided with means for performing. 8. The method according to claim 7, wherein the first
The water heater having a set temperature lower than that of the second set temperature. 9. A water heater capable of supplying general hot water, which detects the necessity of changing the set temperature used for combustion control from the current temperature to another temperature during use of the general hot water, and changing the set temperature. And a means for changing the set temperature to be used from the current temperature to the another temperature stepwise or continuously when it is detected that the hot water supply is required. 10. The water heater according to claim 9, wherein the current temperature is lower than the other temperature. 11. A means for detecting that the type of operation has been changed, and a set temperature used for combustion control from a first set temperature for the operation before the change to a second set temperature for the operation after the change. And a means for changing the set temperature to the set temperature in a stepwise or continuous manner. 12. The water heater according to claim 11, wherein the first set temperature is lower than the second set temperature. 13. A means for detecting the need to change the set temperature used in combustion control from the current temperature to another temperature, and the set temperature to be used when the need to change the set temperature is detected. And a means for changing the current temperature from the current temperature to the another temperature stepwise or continuously. 14. The water heater according to claim 13, wherein the current temperature is lower than the other temperature.