JPH0245788B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composite water heater that uses gas, oil, electricity, etc. as a heat source and automatically supplies hot water to a bathtub or the like with a large flow rate.

Conventional configuration and problems thereof Conventionally, this type of composite water heater system has been configured as shown in FIG.

A forced water flow type heat exchanger 2 (hereinafter referred to as
heat exchanger A) and natural circulation heat exchanger 3 (heat exchanger B
) and is connected to the bathtub 5 via the circulation pipe 4 of the heat exchanger B3. The hot water outlet of the heat exchanger A2 is configured to be branched outside the appliance and guided to a hot water tap A6 and a hot water tap B7 (configured so as to face the bathtub 5).

The hot water tap B7 is configured to detect the flow rate by itself once it is manually opened, and to close once a certain amount of hot water has been supplied. It is usually configured separately from the combined water heater and is installed during installation work. A temperature detector 8 is also provided at the outlet of the heat exchanger A2.

Fuel is supplied from the inlet portion 9, and generates heat in the combustion portions A10 and B11, which are provided corresponding to the heat exchangers A2 and B3.

Further, the fuel supply system includes a combustion controller A12 and a fuel controller B13. 14 is a remote control,
15 is a control section. The remote control 14 can also be installed remotely.

When hot water is supplied by dropping into the bathtub 5 using the heat exchanger A2, when the water supply pipe B7 near the bathtub 5 is opened, fuel is supplied to the combustion part A10 by the combustion controller A12, and hot water is supplied at the hot water temperature according to the remote control setting. is done. At this time, the bathtub 5 is in an open state, which causes a large heat radiation loss and poses a problem in energy saving.

In addition, since it is not possible to supply a large amount of hot water, it takes a long time to take a bath, resulting in increased heat radiation loss and problems in ease of use.

Purpose of the Invention The present invention is intended to eliminate such conventional drawbacks, and to increase the capacity during automatic hot water supply and prevent heat radiation loss, hot water is guided to the reheating circuit through a bypass circuit and provided without sacrificing economic efficiency. and the combustion part on the reheating circuit side.
The ON/OFF and combustion amount control of the water heater combustion part depends on the load of the bypass circuit (pouring circuit), and the inlet water temperature,
The purpose of this system is to realize high-capacity hot water supply by determining and controlling the amount of water and the hot water temperature, and to improve usability by supplying hot water in a short time.

Structure of the Invention In order to achieve this object, the present invention divides the outlet section of one forced water flow type heat exchanger (hereinafter referred to as heat exchanger A) by a distribution section within the device main body, and a bypass circuit ( The configuration is such that it can be supplied to another natural or forced circulation type heat exchanger (hereinafter referred to as heat exchanger B) as a pouring circuit) and reheated, and the reheating condition is the amount of water provided at the entrance and exit of the forced flow type heat exchanger. The amount of hot water poured by a sensor is detected, the water temperature is detected by an incoming water temperature detector, the hot water temperature is detected by a temperature detector, and the hot water supply load is calculated by the control unit. If the hot water supply load is larger than heat exchanger A, it is reheated by heat exchanger B, and the water is reheated. If the heating capacity is insufficient, the water flow control valve is used to control the amount of water, and the control unit controls these functions.

With this configuration, automatic hot water supply to the bathtub is as follows. At the same time as heating of the heat exchanger B starts, the drive valve is opened by the control section, and hot water is supplied into the bathtub via the heat exchanger B through the vacuum breaker valve. At this time, the bathtub can be sealed (with a lid), which has the effect of preventing heat radiation and increasing energy savings. At this time, the hot water supply load of the hot water pouring circuit is determined by the control section (microcomputer calculation) by detecting the water flow rate, incoming water temperature, and hot water temperature, and controlling each combustion section.

For example, if the hot water supply load is less than the capacity of the heat exchanger A-side combustion section, the heat exchanger B combustion section is turned off (at this time, the heat exchanger A-side combustion section is in a proportional control state); otherwise, it is turned on. If it is ON, it will be reheated, so the temperature of hot water supplied to the bathtub is obtained from the heat exchange performance of heat exchanger B and is controlled by a predictive control state (the thermal efficiency of heat exchanger B is made constant by the combustion amount and calculated by a microcomputer). It works.

As a result, even when the water temperature is low in winter, it is possible to increase the capacity due to the reheating effect, and the hot water supply can be set to a large flow rate, allowing for short bathing times.
This improves usability. Moreover, since predictive control is used, the hot water supply temperature can be obtained according to the setting device without being influenced by the amount of hot water in the bathtub and the hot water temperature (or the water temperature state in the case of remaining hot water).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 2 to 4. In FIG. 2, a forced water flow type heat exchanger 17 (heat exchanger A) is provided in the device main body 16, and a water amount sensor 27, an inlet water temperature detector 43,
A water flow control valve 44 is provided, and a temperature sensor 21 is installed at the outlet.
After configuring, the hot water supply circuit is divided by the distribution unit 22, one side is connected to the hot water tap 24 outside the appliance, the other side is connected to the hot water supply pipe 23 via the drive valve 35, and the vacuum break valve 38.
is formed at a higher position than the bathtub 20, protrudes into the water pipe 19 of the natural circulation heat exchanger 18, and has a tip opening 25 facing into the heat exchange path 46 of the natural circulation heat exchanger 18. do. The molten metal pouring pipe 23 circuit is collectively referred to as a bypass circuit (molten metal pouring circuit).

Heat exchanger A17 and heat exchanger B18 each have a combustion section A.
31, a combustion section B32 is provided correspondingly.
An exhaust chamber 37 is provided downstream of the heat exchanger A17 and the heat exchanger B18, and the exhaust heat is discharged from the exhaust port 42 by the blower 36. The fuel supplied from the fuel supply port 41 is controlled according to the load by a fuel controller A29 and a fuel controller B30, and generates heat in the combustion parts AB31 and AB32. 28 is a water supply port, 33 is a control unit, and 34 is a setting device that can be remotely installed.

FIG. 3 is a detailed view of the entry portion of the pouring pipe 23, and FIG. 4 is an example in which a circulation pump 45 is provided in the water circuit in the heat exchanger B18, and the other configurations are the same. The arrow is circulation pump 4
5 shows the circulation direction during operation.

Specifically, the combustion part B32 is started by manual start of the setting part 34, and is activated by transmitting a signal (S1) to the fuel controller B30 by the control part 33. In the case of automatic hot water supply, the combustion part B32 is started by manual start of the setting part 34. According to
When the drive valve 35 is opened, the water flow sensor 27 detects the movement of water in the heat exchanger A17, transmits a signal (S2) to the control unit 33, and then transmits it to the fuel controller A29 as a command signal (S3). The temperature sensor 21 operates by transmitting the signal (S4) to the control unit 33, but the inlet water temperature sensor 4 is always activated.
3. The fuel controller A29 is configured to determine the hot water supply load based on the temperature difference between the entrance and exit of the temperature detector 21 and the water flow rate of the water flow sensor 27, and control the temperature to the desired set temperature, and the hot water supply load is below the capacity of the combustion section A31.
In the above case, the fuel controller B is turned on and the reheating mode control is performed in which the heat exchanger B18 is heated in the combustion section B32.
The hot water supply temperature control in this reheating mode is in a predictive control state (the thermal efficiency of heat exchanger B is made constant by the combustion amount,
If the capacity is insufficient, the water volume control valve 44 will throttle the water volume.

When the hot water tap 24 is opened, only the combustion part A31 generates heat, and the water flow sensor 27, the incoming water temperature detector 43, and the temperature detector 21 control the fuel controller A2.
9, and if the hot water supply load exceeds the capacity, the water flow control valve 44 performs water flow throttling control. The heating control described above is based on determination control based on microcomputer calculations.

In the above configuration, if automatic hot water supply is set by the setting device 34, the controller 33 determines whether the hot water supply mode or the reheating mode is selected depending on the hot water supply load, and the fuel controllers A and B
29 and 30 are controlled.

Therefore, when the water temperature is low in winter, the reheating mode is set and a large flow rate of hot water can be achieved, making it possible to supply hot water to the bathtub 20 in a short time, improving usability, and reducing heat radiation loss because of the short time. I'm done. Generally, the hot water supply capacity is No. 16, but in the case of reheating mode, an additional 10,000 to 13,000 kcal/h (No. 5 to 6.5) is added, so it becomes No. 21 to 22.5, and the amount of hot water supplied at a water temperature of 2°C (winter). can guarantee a rate of 15L/min, and the 25-minute bathing time will be reduced to 12-14 minutes.

Moreover, hot water can be supplied through the bypass circuit with the bathtub 20 covered, and heat radiation loss can be largely prevented.

Even if the hot water supply faucet 24 is opened during automatic hot water supply, resulting in multiple faucets, there is no problem because the capacity is greatly increased.

Effects of the Invention As described above, according to the combined water heater of the present invention, (1) the reheating mode can be selected depending on the hot water supply load during automatic hot water supply, the hot water supply capacity can be increased to a large flow rate, and short bathing times can be realized. , (especially in winter,
Highly effective) It is possible to improve usability, reduce heat radiation loss, and achieve energy saving effects.

(2) Load control in reheating mode is a predictive control method, and the hot water supply temperature can be obtained according to the setting device without being affected by the amount of hot water in the bathtub or the hot water temperature (in the case of remaining hot water, the water temperature status). Therefore, the degree of freedom in using the equipment is greatly improved.

(3) Automatic hot water supply through the lubrication circuit, which provides sufficient energy-saving effects.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional combined water heater, Fig. 2 is a block diagram of a combined water heater according to an embodiment of the present invention, Fig. 3 is a detailed view of the hot water pouring pipe and water pipe of the present invention, and Fig. The figure is a configuration diagram showing another embodiment. 16... Appliance body, 17... Forced water exchanger, 18... Natural circulation heat exchanger, 21... Temperature detector, 22... Distribution section, 23... Molten pouring pipe, 24
... Hot water faucet, 27 ... Water flow sensor, 31 ... Combustion section A, 32 ... Combustion section B, 33 ... Control section, 3
4...Setting unit, 35...Drive valve, 38...Vacuum breaker valve, 43...Water inlet temperature detector, 44...Water flow control valve.

Claims (1)

[Claims] 1. The appliance body is equipped with a forced water flow type heat exchanger and other natural or forced circulation type heat exchangers, and a combustion section is provided corresponding to each of the heat exchangers, and the inlet side of the forced water flow type heat exchanger is provided. A water flow sensor, an inlet water temperature sensor, and a water flow control valve are installed on the molten metal pouring pipe, and a temperature sensor is installed on the outlet side, and the outlet side is divided, one side is led outside the appliance, and the other side has a drive valve and a vacuum breaker valve. The hot water is introduced into the natural or forced circulation heat exchanger through the molten metal to form a pouring circuit, and the opening operation of the driven valve depends on the setting device, and the opening operation of the driven valve is controlled by the natural or forced circulation heat exchanger side during the opening operation. A composite water heater comprising a control unit that determines and controls ON/OFF of the combustion unit of the combustion unit and the combustion amount of the combustion unit of the forced water heat exchanger side depending on the load of the hot water pouring circuit.