JPH0243973B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composite water heater that reheats hot water using gas, oil, electricity, or the like as a heat source.

Conventional configuration and problems thereof Conventionally, this type of composite water heater 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 (hereinafter referred to as
A heat exchanger B) is provided, connected to the bathtub 9 via the circulation pipe 4 of the heat exchanger B, a hot water temperature sensor 6 is provided at the outlet of the heat exchanger A, and the outlet of the hot water circuit is connected to the hot water taps 7 and 8. It is usually installed with multiple taps in the same way as other large water heaters. Fuel is supplied from the inlet portion 9, and heat is generated in heaters A10 and B11 provided corresponding to heat exchanger A and heat exchanger B. In addition, a fuel controller A12 is provided in each fuel supply system.
It constitutes a fuel controller B13. 14 is a setting device, and 15 is a control section. There is also a remote installation configuration for the 14 setting device.

The hot water discharged by the heat exchanger A during or after reheating of the water in the bathtub 5 by the heat exchanger B will be described as an example.

When a heating signal for the heat exchanger B3 is output from the setting device 14, fuel is supplied to the heater B11 by the control unit 15 and the fuel controller B13 to reheat the water in the bathtub 9 via the heat exchanger B3.

Generally, this reheating operation is completed after several tens of minutes to about an hour. In this case, the inside of the appliance main body 1 is heated by convection heat, radiant heat, etc., and the water in the heat exchanger A2 also becomes hot water. In this state, if the hot water tap 7 or 8 is opened, it is obvious that high-temperature hot water will come out. Further, at the same time as water (hot water) flows through the heat exchanger A2, the heater A10 is operated by the control section 15 and the fuel controller A12 to heat the heat exchanger A2. In that case, the hot water will be heated again and may even vaporize, which is dangerous. (Generally referred to as the after-boiling phenomenon) This poses a serious problem, especially since the hot water tap 8 installed in the bathtub 5 and the like is used as a shower.

In recent years, even complex water heaters have been required to be smaller and more compact, and this cannot be achieved unless the above-mentioned drawbacks are resolved.

Purpose of the Invention The present invention is intended to eliminate such conventional drawbacks, and is to introduce high-temperature water into the reheating circuit through a bypass circuit as a means to prevent the phenomenon of after-boiling of hot water during use after reheating is used. The purpose of this system is to stabilize hot water supply temperature and improve safety without sacrificing economic efficiency.

Structure of the Invention In order to achieve this object, the present invention provides a temperature sensor at the outlet of one of the forced water flow type heat exchangers (hereinafter referred to as heat exchanger A), and then divides the temperature sensor within the device body.
One side is configured as a hot water circuit outside the equipment, and the other side is configured as a hot water pouring circuit, and the other side is configured so as to face the water supply pipe installed in the water pipe line of another natural or forced circulation heat exchanger (hereinafter referred to as heat exchanger B). In the hot water circuit, there is a forced opening/closing type valve that is controlled by the control unit based on the signal from the water flow detector installed at the inlet of the forced circulation type heat exchanger. With this configuration, the control section has a function of determining the state of the heat exchanger B. For example, heat exchanger B is in use. Not so. This is a judgment such as how many minutes have passed since use, and if the hot water supply circuit is opened while heat exchanger B is in use or after how many minutes have passed, the valve is opened for a certain period of time or according to the signal from the temperature sensor. It constitutes the function that performs.

With this configuration, the indirect heating (post-boiling) of the heat exchanger A due to the heating operation of the heat exchanger B is as follows.

When the hot water tap in the hot water supply circuit is opened, hot water (water) in the heat exchanger A flows due to water pressure. At the same time, the water flow detector operates and the valve of the pouring circuit is opened via the control unit, and the hot water in the heat exchanger A is transferred from the pouring circuit to the heat exchanger B.
Furthermore, it is retained in the bathtub, acts as a heat insulator in the bathtub, and improves energy saving.

After a certain period of time, the valve closes and hot water is supplied from the hot water tap according to the settings, which improves safety since hot water is not supplied.

Furthermore, by constantly detecting the temperature at the outlet of the heat exchanger A using a temperature detector, the closing operation of the valve can be controlled without affecting the hot water temperature, thereby increasing comfort.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

In FIG. 2, a forced water flow type heat exchanger 17 (hereinafter referred to as heat exchanger A) and a natural circulation type heat exchanger 18 (hereinafter referred to as heat exchanger B) are installed in the appliance body 16, and water pipes of heat exchanger B18 are installed. A hot water tap connected to a bathtub 20 via a passage 19 and provided with a temperature detector 21 at the outlet of the heat exchanger A17, and then provided with a split part 22, with one part provided in a hot water pouring pipe 23 and the other part provided in a hot water outlet circuit outside the appliance. 24, a valve drive unit 25 is provided in the circuit of the molten metal pouring pipe 23, and is attached to the molten metal pouring port 26 at the tip of the water supply pipe 23.
7 is on the way. The circuit of this pouring pipe 23 is collectively referred to as a bypass circuit.

The water supply pipe 27 is formed perpendicularly to the water pipe line 19 of the heat exchanger B18, and its height is set larger than the bathtub 20. A heater A28 and a heater B29 are provided in correspondence to the heat exchanger A17 and the heat exchanger B18, respectively. The fuel supplied from the fuel supply port 31 is controlled according to the load by a fuel controller A32 and a fuel controller B33, and is generated in the heaters AB28 and AB29.

Further, a water amount detector 30 is provided at the inlet of the heat exchanger A17. 35 is a setting device for heating and may be installed remotely. Reference numeral 34 denotes a control unit which receives signals from each detector and operates each controller, valve, etc. according to settings.

FIG. 3 shows an example in which a forced circulation pump 6 is provided in the water circuit of the heat exchanger B18 on the side where molten metal is poured, and the other configurations are the same.

Specifically, the heater B29 is started by manual start of the setting device 14, and has a semi-manual control configuration in which the control unit 34 transmits a command signal (S ₁ ) to the fuel controller B33 to operate it. In the device A28, the water flow detector 30 detects the movement of water in the heat exchanger A17 due to the opening of the hot water tap 24, transmits a signal (S ₂ ) to the control unit 34, and then transmits the signal (S 2 ) to the fuel controller 3 as a command signal (S ₃ ).
The temperature sensor 21 operates by being transmitted to the signal (S ₄ ) of the temperature detector 21, and is constantly corrected and controlled to the desired set temperature. Also, during heating of heater B29, or within a certain period of time after heating, heater A
When 28 operates as described above, the following new function (command) is added. At the same time as the signal (S ₂ ) from the water amount detector 30 is transmitted to the control unit 34, the control unit 34 outputs an open signal (S ₅ ) to the valve drive unit 25, and the signal (S 2 ) from the temperature detector 21 is transmitted for a certain period of time or ₄ ) to issue a close signal (S ₆ ).

When reheating is performed using the heat exchanger B18 in the above configuration, the signal (S) issued by the setting device 14 is transmitted to the fuel controller B33 by the control unit 34, and then a predetermined fuel is supplied to the heater B11. , the heat exchanger B18 starts heating. Heat exchanger B18 transfers the heat to water pipe 35
The heat is transmitted to the water in the bathtub 20 and causes a temperature raising effect, and as the temperature rises, a circulation effect occurs, and the water in the bathtub 20 is heated one after another. In this case, all of the heat generated by the heater B11 is not heat exchanged, and generally 70 to 75% is heat exchanged. Other heat is released to the outside of the instrument body 16 or retained within the instrument body 16 by convection, radiation, or the like. In this case, since water is stagnant in the heat exchanger A17 at room temperature, the temperature naturally increases until it absorbs this heat and maintains the heat balance, generally reaching 60 to 70°C. In particular, the more compact the instrument main body 16 is, the more conspicuous it becomes.

In this state, when the hot water tap 24 is opened, the valve drive section 25 in the hot water pouring pipe 23 becomes open due to the above configuration, and the high temperature hot water in the heat exchanger A17 is poured into the hot water pouring port 26.
The water is sent to the water supply pipe 27 (bypass effect).
It is mixed with the hot water in the water pipe 19 and retained in the bathtub 20, resulting in a heat retention effect and an energy raising effect. At this time, hot water with a small post-boiling temperature rise is supplied from the hot water tap 24, increasing safety.

Further, after the bypass, the temperature sensor 24 determines the closing operation of the valve driving section 25, so the stability of the water temperature is extremely stable as shown in FIG. solid line
Th1 has a maximum peak of 95°C in the conventional hot water outlet temperature characteristics. The broken line Th2 provides a temperature characteristic in which the pre-peak value is almost eliminated due to the bypass effect, and provides sufficient comfort even when used for showering or the like.

Effects of the Invention As described above, according to the composite water heater of the present invention, the abnormal temperature rise in hot water that occurs during reheating can be prevented by the configuration of the water flow detector, the bypass circuit provided on the hot water outlet side, and the temperature detector. Stable hot water can be obtained from the hot water tap in the bathtub, which has the effect of keeping warm, saving energy, extremely improving safety, and increasing comfort.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional combined water heater, FIG. 2 is a block diagram of a combined water heater which is an embodiment of the present invention, FIG. 3 is a block diagram showing another embodiment of the present invention, and FIG. The figure is a hot water supply temperature characteristic diagram after reheating of the present invention and a conventional example. 16...Appliance body, 17...Forced water flow type heat exchanger, 18...Natural or forced circulation type heat exchanger,
19...Water pipe line, 21...Temperature detector, 22...
Divided part, 23... Molten pouring pipe, 25... Valve drive part, 2
7... Water supply pipe.

Claims (1)

[Claims] 1 The device body is equipped with a forced water flow type heat exchanger and other natural or forced circulation type heat exchanger, and a water amount detector is provided on the inlet side of the forced water flow type heat exchanger, and the output side is installed inside the device body. A hot water pouring circuit that is divided into two parts and pours hot water into a hot water supply pipe installed in the water pipe section of the natural or forced circulation heat exchanger through a hot water supply pipe equipped with a valve that forcibly opens and closes one part of the hot water supply circuit outside the appliance and the other part of the hot water supply pipe that is equipped with a valve that forcibly opens and closes the water. During the heating of the natural or forced circulation heat exchanger, or when the hot water supply circuit is operating within a certain period of time after heating, the valve in the hot water pouring circuit is opened in response to the signal from the water flow rate detector. A composite device comprising means for bypassing the water in the forced water flow type heat exchanger to the water pipe of the natural or forced circulation type heat exchanger by closing after a set time or in response to a signal from a temperature detector provided on the outlet side. Water heater.