JP3006202B2 - Water heater control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a priority control apparatus for controlling the combustion capacity of a one-can, two-channel water heater.

[0002]

2. Description of the Related Art A conventional control device of this type is, for example, shown in FIG.
As shown in FIG. 1, a heat exchanger 1, a hot water supply pipe 2 and a bath reheating pipe 3 provided in the heat exchanger 1, a burner 4 for heating the heat exchanger 1, and a fuel (gas) A fuel control valve 5 for sending to the burner 4, an igniter 6 for igniting the burner 4,
Hot water temperature detecting means (thermistor, etc.) 7 for detecting the temperature of hot water in hot water supply pipe 2, hot water supply water switch 8 for detecting water supply in hot water supply pipe 2, and hot water supply pipe 3
Bath temperature detecting means (thermistor, etc.) 9 for detecting the temperature of hot and cold water flowing through the tub, a circulating pump 11 for heating and circulating water in a bathtub 10, setting of hot water supply temperature / bath temperature, turning on / off reheating.
Operation controller 12 for turning off and the like, hot water supply bath control means 13
Consists of

A hot water supply / bath control means 13 receives a hot water supply / bath control signal from the operation controller 12, inputs a hot water supply temperature and a bath temperature from the hot water supply temperature detecting means 7 and the bath temperature detecting means 9, respectively, and executes a predetermined procedure. Then, the igniter 6 and the fuel control valve 5 are operated, the burner 4 is ignited, the combustion amount is controlled, and at the time of reheating, the circulation pump 11 is operated.
The water in the bathtub 10 is heated and circulated. In addition, 14 is a curan installed at the end of the hot water supply pipe 2. When the curan 14 is opened or when the operation controller 12 is turned on from the reheating off, the hot-water supply bath control means 13 switches the igniter 6 and the fuel control valve 5 in a predetermined procedure as described above. A control signal was sent, heating was controlled by a burner, and a predetermined hot water supply and a predetermined bath temperature heating circulation to the bathtub water were performed.

[0004]

However, in the above configuration, the bath reheating operation and the hot water supply operation are independently operated regardless of whether the required combustion amount exceeds the maximum supply combustion amount, or Bath reheating was stopped uniformly. Therefore, the method of uniformly stopping the reheating of the bath restricts the reheating operation more than necessary, and deteriorates usability. In addition, the method of operating the bath reheating and the hot water supply operation independently is that if the maximum supply combustion amount is exceeded, both the bath reheating and the hot water supply operation will be insufficient, and especially the required temperature on the hot water supply side will be obtained. There is a problem that the state that cannot be maintained continues.

The present invention solves such a conventional problem, and constantly monitors the bath reheating operation and the amount of combustion required for the hot water supply operation of the water heater, thereby reducing the amount of combustion for bath reheating and the amount of combustion for hot water supply. It is determined whether or not the total combustion amount has exceeded the maximum supply combustion amount.
An object of the present invention is to provide a water heater capable of accepting a bath reheating operation and improving usability by securing a hot water supply temperature and expanding a bath reheating operation range.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a control device of a water heater according to the present invention is provided with a circulation pump for transferring hot water from a bath for hot water supply to a bathtub and a hot water supply line. Incoming water temperature detecting means for detecting the incoming water temperature, flow rate detecting means for detecting the amount of water supplied to the hot water supply pipeline,
The required amount of combustion on the hot water supply side is calculated from the hot water supply temperature setting means for setting the hot water supply temperature, the incoming water temperature detection means, the flow rate detection means, and the hot water supply temperature setting means, and the required combustion amount for reheating a predetermined bath. If the total required combustion amount exceeds the maximum supply combustion amount or a value obtained by subtracting a predetermined amount from the maximum supply combustion amount, a combustion amount control means for stopping the circulation pump is provided.

[0007]

According to the present invention, the total amount of combustion for bath reheating and hot water supply is maximized by always monitoring the bath reheating operation and the amount of combustion required for the hot water supply operation of the water heater. It is determined whether or not the supply combustion amount has been exceeded, and the bath reheating operation can be received as much as possible within the capacity range on the hot water supply side. In addition, if the total combustion amount of the post-bath burning combustion amount and the hot water supply combustion amount exceeds the maximum supply combustion amount,
Immediately stop the circulation pump and secure the hot water temperature on the hot water supply side. Therefore, the opportunity of the bath reheating operation within the maximum supply combustion amount is expanded, and the stable supply of hot water with priority given to the hot water temperature is realized.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same members as those in FIG. 3 of the conventional example are denoted by the same reference numerals, detailed description thereof will be omitted, and different portions will be mainly described. FIG. 1 is a control configuration diagram of the water heater of the present invention. 1
5 is an incoming water temperature detecting means for detecting an incoming water temperature supplied to the hot water supply pipe 2, 16 is a flow rate detecting means for detecting an amount of supplied water to the hot water supplying pipe 2, and 17 is an incoming water temperature detecting means 15, the flow rate detection means 16, the input temperature of the water from the operation controller 12, the flow rate, and the set temperature of the hot water supply are calculated, and the required combustion amount for the hot water supply is calculated. The required combustion amount is the sum of the required combustion amount for the additional bath reheating and the required combustion amount.If the total required combustion amount exceeds the maximum supply combustion amount or a value obtained by subtracting a predetermined amount from the maximum supply combustion amount, circulation is performed. This is combustion amount control means for stopping the pump 11. Further, the combustion amount control means 17
Inputs a reheating operation signal from the operation controller 12, a set temperature signal such as a bath set temperature, and outputs a combustion control signal and an ignition drive signal to the fuel control valve 5, the igniter 6, and a circulation pump. 9 to output a drive control signal.

The operation of the above configuration will be described with reference to a flowchart shown in FIG.

In FIG. 2, when the hot water supply is used alone, the combustion amount control means 17 detects the opening of the curan 14 by the flow rate detection means 16 (s1) and, at the same time, the water supply amount (FL) supplied to the hot water supply pipeline 2 (FL). ), The incoming water temperature (TH1) detected by the incoming water temperature detection means 15, and the hot water supply set temperature (TS) set by the operation controller 12, determine the required combustion amount (QGI) for hot water supply from the following equation. Then, a combustion amount output corresponding to the required combustion amount (QGI) is output to the fuel control valve 5.

QGI = (TS−THI) × FL ÷ K (1) K is hot water supply efficiency (s2). At the same time, the operation controller 12 checks whether or not the bath reheating switch is turned on (s3). If the bath reheating switch is not turned on, the circulation pump 11 is turned off (s
4). If the bath reheating switch is turned on, the required combustion amount (QGI) obtained by adding the predetermined combustion amount (QGF) predetermined by the bath temperature detected by the bath temperature detection means 9 and the required combustion amount (QGI) of the hot water supply is required. Combustion amount (QG
W) is calculated from the following equation, and a combustion amount output corresponding to the required combustion amount (QGW) is output to the fuel control valve 5 (s5).

QGW = QGI + QGF (2) Here, it is determined whether the total required combustion amount (QGW) exceeds the maximum supply combustion amount (QGMAX) of the water heater (s6).

If QGW <QGMAX (3), the circulation pump 10 is turned on to enable reheating (s7).

If QGW ≧ QGMAX (4), the circulation pump 10 is turned off to stop reheating (s4).

When the hot water supply is not used, the operation controller 12 checks whether or not the bath reheating switch is turned on (s8). If the bath reheating switch is not turned on, the circulating pump 10 is turned off to stop the combustion (s9, s10). If the bath reheating switch is on, a predetermined combustion amount (QG) determined in advance by the bath temperature detected by the bath temperature detecting means 8
The output of the combustion amount corresponding to F) is output to the fuel control valve 5 (s11), and the circulation pump 10 is turned on (s11).
7). Then, while monitoring the hot water temperature of the bathtub 9 by the bath temperature detecting means 8, the water is heated up to the set bath temperature or a predetermined time limit.

Here, in either case of using the hot water supply alone or simultaneously using the hot water supply bath, the so-called PID control (the hot water supply temperature is set by the hot water supply temperature from the operation controller 12 by the hot water supply temperature detecting means 7). By performing the feedback control), the hot water supply tap temperature deviation at the time of outputting the combustion amount corresponding to the above-described hot water supply combustion amount (QGI) and the total required combustion amount (QGW) is corrected.

Therefore, when using hot water and bath reheating at the same time,
By constantly monitoring the required combustion amount of hot water supply (QGI) and the required combustion amount of post-bath heating (QGF), the total combustion amount (QGW) of both required combustion amounts is the maximum supply combustion amount (QGMAX).
It is determined whether or not the total combustion amount (QGW) has exceeded the maximum supply combustion amount (QGMAX). In addition, when the total combustion amount (QGW) of the combustion amount for bath reheating and the combustion amount for hot water supply exceeds the maximum supply combustion amount (QGMAX), the circulation pump is immediately stopped to reduce the hot water supply temperature on the hot water supply side. Secure.

Note that the maximum supply combustion amount (QGMAX) is not limited to the supply combustion amount (input) corresponding to the maximum output of the water heater as in the above-described embodiment. Considering the variation of each temperature detection means, etc.
By setting a value obtained by subtracting a predetermined amount from the maximum supplied combustion amount, hot water supply at a more accurate hot water supply set temperature can be performed.

[0019]

As described above, according to the water heater control device of the present invention, the following effects can be obtained. 1) By constantly monitoring the bath post-heating operation and the combustion amount required for the hot water supply operation of the water heater, the total combustion amount of the bath post-heating combustion amount and the hot water supply combustion amount is within the maximum supply combustion amount, that is, within the range of the hot water supply capacity. Thus, a bath reheating operation becomes possible. Therefore, the opportunity of the bath reheating operation within the maximum supply combustion amount is expanded, and the usability is improved. 2) Since the capacity of the hot water supply side is always ensured when the hot water is used alone or simultaneously with the reheating of the bath, it is possible to provide a highly reliable hot water heater that stably secures the hot water temperature.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device of a water heater in one embodiment of the present invention.

FIG. 2 is a flowchart showing operating characteristics of the control device.

FIG. 3 is a control block diagram of a conventional water heater control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Hot-water supply line 3 Bath additional heating line 4 Burner 11 Circulation pump 12 Hot-water supply temperature setting means 15 Incoming water temperature detection means 16 Flow rate detection means 17 Combustion amount control means

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masaatsu Inoue 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. JP-A-2-251046 (JP, A) JP-A-3-51659 (JP, A) JP-A-62-266053 (JP, A) JP-A-4-236054 (JP, A) JP-A-4-350455 (JP, A) JP-A-1-136338 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/00 604

Claims (1)

(57) [Claims] 1. A heat exchanger, a burner for heating the heat exchanger, a hot water supply line and a bath reheating line provided in the heat exchanger, and a bathtub from the bath reheating line. A circulating pump for transporting hot water, an incoming water temperature detecting means for detecting an incoming water temperature supplied to the hot water supply pipe, a flow rate detecting means for detecting an amount of supplied water to the hot water supply pipe, and a hot water temperature Hot water supply temperature setting means for setting the water supply temperature detection means, flow rate detection means and hot water supply temperature setting means to calculate the required combustion amount on the hot water supply side, and the required combustion amount for predetermined bath reheating. And a combustion amount control means for stopping the circulation pump when the total required combustion amount exceeds a maximum supply combustion amount or a value obtained by subtracting a predetermined amount from the maximum supply combustion amount.