JPH0245787B2 - - 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).

Once the hot water supply faucet B7 is manually opened, it detects the flow rate by itself and is closed 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 fuel 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 fuel 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 in order to increase the capacity during automatic hot water supply and prevent heat radiation loss, the hot water is guided from the hot water pouring circuit to the reheating circuit without sacrificing economic efficiency. In addition, it determines whether the bypass circuit of the water heater (forced water heat exchanger) is open or closed based on the ON/OFF of the drive valve in the hot water pouring circuit and the load of the hot water pouring circuit (incoming water temperature, water volume, and hot water temperature). The purpose of this control is to achieve high-flow hot water supply and improve usability by short-time hot water supply.

Composition of the Invention In order to achieve this object, the present invention divides the outlet part of one forced water flow type heat exchanger (hereinafter referred to as heat exchanger A) by a distribution part in the appliance main body, By opening and closing the driven valve, the heat exchanger can be supplied to another natural or forced circulation type heat exchanger (hereinafter referred to as heat exchanger B) and reheated, and it is installed at the entrance and exit of the forced circulation type heat exchanger during reheating. The amount of hot water poured by the water flow sensor is detected, the water temperature is detected by the incoming water temperature detector, the hot water temperature is detected by the temperature detector, and the hot water supply load of the hot water pouring circuit is calculated by the control unit and compared with the combustion unit capacity, and the hot water supply load is determined as heat exchanger A. If the total capacity of the heat exchanger A and the heat exchanger B is less than or equal to the total capacity, the bypass circuit of the heat exchanger A is controlled to be in an open state, and if the total capacity is greater than that, the bypass circuit of the heat exchanger A is controlled to be in a closed state. Furthermore, if the hot water supply load exceeds the total capacity due to the opening of the bypass circuit, it is controlled by the water flow control valve.
With this configuration, automatic hot water supply to the bathtub is as follows. At the same time as heating of heat exchanger A and heat exchanger B starts, the drive valve is opened by the control section, and hot water is supplied into the bathtub via heat exchanger B. At this time, the bathtub can be sealed (with a lid), which helps prevent heat radiation.

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, when the drive valve is open, if the load due to the amount of hot water passing through heat exchanger A is less than the total capacity of heat exchanger A combustion section and heat exchanger B combustion section (water temperature of about 8°C or higher), the bypass circuit is opened and the hot water pouring circuit is opened. The effect is to increase the amount of hot water supplied to the tank, supply hot water at a high capacity, and fully demonstrate the reheating ability. (At this time, the combustion section on the heat exchanger A side is in a proportional control state)
If the capacity of the bypass circuit is exceeded, a water flow control valve is activated to adjust the load. Also, when the water temperature is below about 8° C., the bypass circuit is closed and reheating is performed.

The temperature of hot water supplied into the bathtub is obtained by the heat exchange performance of the heat exchanger B, and the system operates under a predictive control state (the heat exchange coefficient of the heat exchanger B is made constant by the combustion amount and is calculated by a microcomputer). Furthermore, the water temperature for opening and closing the bypass valve varies depending on the total capacity of the heat exchanger A combustion section and the heat exchanger B combustion section.

As a result, even when the incoming water temperature is high in spring and summer, it is possible to fully utilize the reheating capacity by increasing the amount of hot water supplied.

Since it is a predictive control, the hot water supply temperature according to the setting device is obtained without being influenced by the amount of hot water in the bathtub and the hot water temperature (in the case of remaining hot water, the water temperature state).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 2 and 3. 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, a bypass circuit 46 is configured to bypass the heat exchanger A17, and after communicating with the outlet section, a temperature detector 21 is configured, and the distribution section 22
Accordingly, the hot water supply circuit is divided, one is connected to the hot water tap 24 outside the appliance, the other 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, thereby creating a natural circulation type. It rushes into the water line 19 of the heat exchanger 18. The molten metal pouring pipe 23 circuit is collectively referred to as a molten metal pouring circuit.

Heat exchanger A17 and heat exchanger B18 each have a combustion section A.
31 and a combustion section 32 are correspondingly provided. An exhaust chamber 37 is provided downstream of the heat exchanger A17 and the heat exchanger B18, and 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 sections A31 and 32. 28 is a water supply port, 33 is a control unit,
34 can be installed remotely using a setting device. 47 is a bypass valve, which may be an ON/OFF type or a proportional/OFF type. 38 vacuum breaker valve has a hopper configuration,
You can cut ties.

Figure 3 shows the circulation pump 4 in the water circuit inside the heat exchanger B18.
5, the other configurations are the same. The arrow indicates the direction of circulation when the circulation pump 45 is in operation.

Specifically, the combustion part B32 is started by manual start of the setting device 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 device 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 hot water supply load is determined based on the temperature difference between the entrance and exit of the temperature detector 21 and the water volume of the water flow sensor 27, and the hot water supply load is controlled to the desired set temperature. If so, the bypass valve 44 is opened, the amount of hot water supplied is increased, the load is operated to the maximum capacity, and the reheating mode is always used for control. The hot water supply temperature control in this reheating mode operates in a predictive control state (the thermal efficiency of the heat exchanger B is constantized by the combustion amount and is calculated by a microcomputer), and if the load exceeds the capacity, the water flow rate of the water flow control valve 44 is controlled. This is throttle control or proportional/OFF control of the bypass valve 47.
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 A29.
If the hot water supply load exceeds the capacity, the water flow rate control valve 44 will throttle the water flow rate. The heating control described above is based on determination control based on microcomputer calculations.

In the above configuration, when automatic hot water supply is set by the setting device 34, the hot water supply load is calculated, and the control unit 33 determines whether to fully use the reheating mode capacity. 44 is controlled.

Therefore, when the water temperature in winter is low (2 to 8 degrees Celsius), high-capacity heating is performed in the reheating mode without bypass, and when the water temperature in spring and summer is low (8 to 30 degrees Celsius), the bypass circuit 46 is used to heat the hot water. By increasing the flow rate, conditions for utilizing the reheating mode can be obtained, making it possible to supply hot water to the bathtub 20 in a shorter time, and improving usability. In addition, heat radiation loss can be reduced because hot water is supplied for a short time. Generally, the hot water supply capacity is No. 16, but in the case of reheating mode, it is further increased to 10,000 to 13,000 Kcal/h (5 to 100 kcal/h).
No. 6.5) is added, resulting in No. 21 to 22.5, which can guarantee a hot water supply of 15 L/min at a water temperature of 2 to 8 degrees Celsius (in winter), and the bathing time of 25 minutes to 12 to 14 minutes. Hot water supply amount 20L/at water temperature 8-30℃ (spring/summer)
min, which allows bathing to take less than 10 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 composite water heater of the present invention, (1) the reheating mode capability during automatic hot water supply can be constantly used in the bypass circuit, making it possible to increase the flow rate of the hot water supply capacity, making it possible to take a bath for a short time. This makes it 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 a hot water pouring 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, and FIG. 3 is a block diagram showing another embodiment. 16... Appliance body, 17... Forced water flow type heat exchanger, 18... Natural circulation type heat exchanger, 21... Temperature detector, 22... Distribution section, 23... Molten pouring pipe, 24
... Hot water tap, 27 ... Water flow sensor, 31 ... Combustion section A, 32 ... Combustion section B, 33 ... Control section, 34
... Setting device, 35 ... Drive valve, 38 ... Vacuum break valve, 43 ... Inlet water temperature detector, 44 ... Water flow control valve, 46 ... Bypass circuit, 47 ... Bypass valve.

Claims (1)

[Claims] 1. The appliance body is equipped with a forced water flow heat exchanger and other natural or forced circulation heat exchangers, a combustion section is provided corresponding to each of the heat exchangers, and a combustion section is provided on the inlet side of the forced water flow heat exchanger. A bypass circuit is provided that includes a water flow sensor and an incoming water temperature sensor, and communicates with the output side through a bypass valve.A temperature sensor is provided after the bypass circuit, and this bypass circuit is divided, one being guided outside the appliance, and the other is guided into the natural or forced circulation type heat exchanger through a pouring pipe having a driving valve and a vacuum break valve to form a pouring circuit, and the opening operation of the driving valve depends on a setting device, and bypass A composite water heater comprising a control unit that controls opening/closing and proportional opening/closing of a valve depending on the opening/closing operation of the driven valve and the load.