JPH1038379A - Method of stabilizing temperature of delivery hot water of hot water supplier, and the hot water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove cold water sandwich phenomena by exchanging the heat of the hot water heated with the heat exchanger of a hot water supplier with the heat of the water which enters the heat exchange, being taken into a hot supplier from a water supply port and cooling the overheated hot water to moderate it, and also, heating supply water. SOLUTION: A heat exchange tank 6 is of a double pipe type, and this is provided with a fin 12 around the inner tube 11, and is provided with a water supply inlet 14 at the upper part of the outer shell case 13, and is provided with a water supply outlet 15 at the lower part. This heat exchange tank 6 exchanges heat between supply water and the delivery water, and the temperature of delivery hot water is lowered, and the temperature of the supply water goes up. In this case, the quantity of heat conduction becomes larger, the larger the temperature difference is, and the temperature difference to be changed is large. Accordingly, the overheat of the hot water coming out of the heat exchanger 4 is moderated greatly. Moreover, even if supply water passes the heat exchanger 4 as it is in a while after a burner 5 operates, it is not kept quite cold and the cold water sandwich can be moderated because the heat is exchanged with that of overheated hot water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a tapping temperature and a hot water supply apparatus, and more particularly, to alleviate overheating of a hot water supply apparatus at the time of hot water replenishment and heat chilled water to prevent a cold water sandwich phenomenon. The present invention relates to a method for relaxing and stabilizing a tapping temperature and a hot water supply device.

[0002]

2. Description of the Related Art Conventionally, a hot water supply device has been used, and after hot water is turned off, hot water is again supplied, hot water comes out after a while, then cold hot water comes out, and then stabilizes.
Various devices for solving the cold water sandwich phenomenon have been proposed. For example, there is a hot water supply device as shown in FIG. The hot water supply device 50 of FIG. 3 is provided with a water quantity sensor 51 for detecting the flow of water before heating taken in from a water supply port 50a and a water input thermistor 52 for measuring the temperature of water at the inlet side. Heat exchanger 53
And a burner 54 that supplies heat for heating water passing through the heat exchanger 53. Further, a bypass 55 for passing cooling water is provided so as to cool the superheated hot water by adding water, and a bypass valve 56 of a solenoid type is provided in the bypass 55 to control the water to be added. Further, a water proportional valve 57 for adjusting the amount of hot water that is opened and closed by a motor.
Is provided in a tapping system downstream of the bypass 55, and a tapping thermistor 58 for measuring the temperature of the tapping-controlled hot water is provided. The bypass valve 56 is opened and closed according to the temperature measured by the tapping thermistor 58. In operation of the hot water supply device 50, the water supply port 50a is opened, the main power of the blower 59 is turned on, and the pilot of the burner 54 of the heating device is ignited or the burner 54 can burn. And faucet 5
When 0b is opened, the water amount sensor 51 detects the flow of water, ignites the burner 54 and burns, and supplies hot water to the user. At this time, the water that has stopped in the system downstream of the heating device of the hot water supply device 50 is not heated, so that it is initially water even when the operation is started, but after a while, it becomes hot water of a constant temperature. . In this case, the required hot water temperature is obtained by setting the hot water temperature or the like. When the faucet 50b is closed once and the hot water is again supplied after use, when the faucet 50b is opened, the water flow sensor 51 detects the flow of water and the blower 59 and the burner 54 are operated to a certain extent. take time. During that time, water flows from the water supply port 50a. Also, the hot water staying in the heat exchanger 53 is
The post-boiling phenomenon occurs due to the residual heat in the heat exchanger 53, and the temperature is considerably high. Therefore, if the overheating is not alleviated, at the time of hot water renewal, the hot water that has stayed in the pipe to the heat exchanger 53 first comes out, and then the overheating that stays in the heat exchanger 53 and is boiling afterwards Hot water comes out, and then cold water comes out before regular operation starts. In the example of FIG. 3, after the burner 54 is extinguished, the blower is rotated for a certain time or the heat exchanger is changed to a devised method, and the steady operation is performed in accordance with the timing at which the retained hot water is discharged from the heat exchanger 53. , The bypass valve 56 is opened until water is cooled by adding water to the overheated hot water to reduce the flow of the overheated hot water from the faucet 50b.

As another example, there is a hot water supply apparatus as shown in FIG. The hot water supply device 60 of FIG.
a water sensor 61 for detecting the flow of water before heating taken in from a and a water input thermistor 62 for measuring the temperature of water
Are provided on the inlet side, and a heating device including a heat exchanger 63 for transmitting heat to the taken water and a burner 64 for supplying heat to the heat exchanger 63 is provided. And, when the hot water obtained by heating the water is overheated, a bypass 65 is provided so as to add a part of the supply water to the hot water so as to reduce the overheating by adding the water when the hot water obtained is overheated. A mixing proportional valve 66 for adjustment is provided, and the mixing proportional valve 66 is driven by a motor. Further, a water proportional valve 67 that opens and closes with a motor to adjust the amount of hot water is provided, and a hot water thermistor 68 that measures the temperature of hot water whose flow rate is controlled is provided. A mixing proportional valve is provided in accordance with the temperature measured by the hot water thermistor 68. 66 is adjusted to prevent overheating of the hot water coming out of the faucet 60b. In this method, the temperature of the hot water flowing out of the faucet 60b is detected, and the amount of the bypass water is adjusted according to this temperature. Therefore, the temperature of the hot water can be reduced to a more suitable temperature as compared with the solenoid-type bypass valve. .

[0004]

As described above, the former one of the conventional water heaters is provided with a solenoid-type bypass valve, and the configuration is complicated, the cost is increased, and a failure easily occurs. In addition, it is difficult to bypass the water for alleviating overheating of hot water, and it is also difficult to set the amount. Furthermore, the cold water could not be heated and the cold water sandwich could not be relaxed as described above. Also, the latter hot water supply device is provided with a motor driven mixing proportional valve, which can control the temperature of tap water, but cannot heat cold water, and to alleviate the phenomenon of cold water from the cold water sandwich, A configuration for heating the tap water must be added, which complicates the configuration and control, increases the cost, and easily causes a failure.

[0005] In view of such problems, the present inventor has studied methods and devices for stabilizing the temperature of various hot water supply devices, and deprived the superheated hot water of water by supplying heat to cool the device, thereby reducing overheating. At the same time, it was found that the temperature of the water supply could be raised and the cold water sandwich could be eliminated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. It is an object of the present invention to simplify the structure and reduce the number of failures by not using electric control to alleviate overheating, and at the same time, to reduce chilled water. It is an object of the present invention to provide a method for stabilizing a tapping temperature of a hot water supply device that can also eliminate a sandwich phenomenon, and a hot water supply device therefor.

[0007]

According to a first aspect of the present invention, there is provided a method for stabilizing a tapping temperature of a hot water supply apparatus, wherein the hot water is heated by a heat exchanger of the hot water supply apparatus. Then, heat is exchanged between water that is taken into the hot water supply device from the water supply port and enters the heat exchanger, and the superheated hot water is alleviated by cooling, and the hot water is heated.

According to a second aspect of the present invention, there is provided a hot water supply apparatus for stabilizing a tapping temperature, comprising: a water amount sensor for detecting a flow of water introduced into the hot water supply apparatus; a heat exchanger for heating the water to produce hot water;
It is characterized by comprising a combustion type heating device for heating the heat exchanger, and a heat exchange tank for exchanging heat between water entering and leaving the heating device. According to a third aspect of the present invention, there is provided a hot water supply apparatus for stabilizing a tapping temperature, wherein a temperature sensor for measuring a temperature of hot water and a flow rate sensor for measuring a flow rate are provided at an outlet side of the heating device.
According to a fourth aspect of the present invention, in the hot water supply apparatus for stabilizing a tapping temperature, the heat exchanger is of a type in which hot water flows inside a pipe and water flows outside the pipe.

The method for stabilizing the tap water temperature of the hot water supply apparatus of the present invention simply involves exchanging heat between the supply water entering the heat exchanger of the heating apparatus and the hot water exiting the heat exchanger. The superheated hot water that has stayed in the heat exchanger and has a post-boiling phenomenon due to residual heat exchanges heat with the feedwater that immediately exits the heat exchanger and enters the heat exchanger, lowers its temperature, and alleviates overheating. On the other hand, the feedwater entering the heat exchanger is heated by hot water heated by the after-boiling phenomenon and the temperature rises, so it is not heated by the burner but heated by heat exchange with the hot water before the burner operates, The temperature of the water supply rises and the cold water sandwich phenomenon is also mitigated.

[0010]

According to the first aspect of the present invention, there is provided a method for stabilizing a tapping temperature of a hot water supply apparatus, wherein the hot water heated by a heat exchanger of the hot water supply apparatus is taken into the hot water supply apparatus from a water supply port and enters the heat exchanger. Heat is exchanged with water, and the heated water is cooled by cooling.
The water supply is heated to lower the temperature, while the water supply is heated with overheated hot water to increase the temperature, which can alleviate overheating, and at the same time, the water supply is heated to increase the temperature, mitigating the cold water sandwich phenomenon. Can also be
Since it is only necessary to exchange heat between the hot water coming out of the heating device and the supply water entering the heating device, the device can be simplified and the device can be made inexpensive.

Further, according to the hot water supply apparatus of the second aspect of the present invention, it is possible to alleviate the overheating and at the same time to alleviate the cold water sandwich phenomenon, and to use a complicated and expensive control device. Instead, it is only necessary to provide a heat exchange tank, so that the apparatus can be simplified and an inexpensive apparatus can be obtained. According to the third aspect of the present invention, since the temperature sensor for measuring the temperature of the hot water and the flow rate sensor for measuring the flow rate are provided at the outlet side of the heating device, the control can be easily performed.
According to the hot water supply device, since the heat exchanger is of a type in which hot water flows in the pipe and water flows out of the pipe, the heat loss of the heat exchanger can be reduced, and the effect of effectively heating the water supply can be obtained. Have.

[0012]

Preferred embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show an embodiment of the present invention.
FIG. 2 is a configuration diagram schematically showing a hot water supply device according to the present invention, and FIG. 2 is a tapping temperature graph showing a state of hot water temperature with respect to a time from the start of operation of the hot water supply device.

The hot water supply apparatus 10 of this embodiment has a water supply port 1 for taking in water and a water quantity sensor 2 for detecting a flow of water before heating at an inlet side, and a heat exchanger for transmitting heat to the taken in water. 4 and a burner 5 for supplying heat for heating water passing through the heat exchanger 4. Further, a heat exchange tank 6 for exchanging heat between hot water heated by the heating device and water entering the heating device is provided. Further, a tapping thermistor 8 for measuring tapping temperature is provided, and a burner 5 is provided.
And a blower 9 for supplying combustion air to the blower. Combustion control is performed by a heating device according to the temperature measured by the tapping thermistor 8. Water entering the heating device and hot water exiting the heating device always pass through the heat exchange tank 6 and exchange heat. In this embodiment, the water inflow thermistor 3 for measuring the temperature of water and the water proportional valve 7 for controlling the flow rate of hot water are provided downstream of the heat exchange tank 6,
The water input thermistor 3 and the water proportional valve 7 may not be provided.

The heat exchange tank 6 is a tubular heat exchanger for passing hot water through the inside of the tube and supplying water outside the tube. The material of the heat transfer section is made of aluminum or copper. Further, as shown in FIG. 1, the water supply path is substantially double-pipe, the fins 12 are provided on the outer circumference of the inner pipe 11 at one time, and the water supply inlet 1 is provided at the upper part of the outer shell case 13.
4 and a water supply outlet 15 is provided at the lower part. Hot water is supplied from the lower part of the inner tube 11 and is discharged from the upper part. In the heat exchange tank 6, heat is exchanged between the supply water and the tap water, so that the temperature of the supply water is lowered and the temperature of the supply water rises. In this case, the larger the temperature difference, the greater the amount of heat transfer, and the greater the temperature difference to be changed. Accordingly, overheating of the hot water flowing out of the heat exchanger 4 is greatly reduced. Further, even if the feed water passes through the heat exchanger 4 as it is for a while after the burner 5 is activated, the hot water is not exchanged with the overheated hot water. The sandwich can be mitigated. Even in the steady state, the hot water always exchanges heat with the feed water, so that it is not possible to obtain high-temperature boiling water, but it is safe without overheating. And
The water flow sensor 2 for detecting the flow of water before heating is provided before water is supplied from the heat exchange tank 6 and enters the heating device.

The water amount sensor 2 is a sensor for detecting that water has begun to flow into the system, for example, a water wheel type flow meter.
When the water supply passes, the water wheel is rotated, a signal is generated in accordance with this rotation, and the blower 9 and the burner 5 are operated,
Activate the combustion device. The water input thermistor 3 is a resistance change type temperature measuring device that outputs a temperature measurement signal using a temperature-sensitive semiconductor having a characteristic of changing resistance according to temperature. The incoming water thermistor 3 measures the temperature of the supplied water.

The heating device comprises a heat exchanger 4 and a burner 5. The heat exchanger 4 is a tubular heat exchanger comprising fin tubes with fins 16, in which water flows inside the tubes and combustion gas flows outside the tubes. It is a flowing type. By providing the fins 16 on the outer periphery of the tube, the heat transfer efficiency is improved, the temperature of the combustion exhaust gas is reduced, and the heat loss due to the exhaust gas is reduced. Various shapes and materials can be used for the fins 16. For example, metals such as copper and aluminum having high thermal conductivity are preferable as the material. Burner 5
Can be used in either a liquid fuel type or a gas fuel type. The point is that when the faucet 17 is opened and hot water is to be discharged, the water quantity sensor 2 detects the flow of water and the blower 9 can start combustion at the same time as the start of operation. Things that take too long or fail because of difficult ignition cannot be used. Burner 5
When a gas-fuel-type blower is used, a gas-suction-type blower may not be used. For a large capacity, a system using a blower is preferable. And it is heated by a heating device,
The hot water that has been supplied by heating the feed water in the heat exchange tank 6 passes through a water proportional valve 7 that controls the flow rate, and the temperature is measured by a tapping thermistor 8 to be supplied from a faucet 17.

The water proportional valve 7 is a valve for controlling the amount of hot water by driving the valve with a motor, and is composed of a ball valve conventionally used in a hot water supply device. The setting of the valve 7 is performed by adjusting a flow rate control knob of a control panel (not shown). Hot water thermistor 8 for measuring the temperature of hot water passing through this valve 7
Is a resistance change type temperature measuring device similar to the water input thermistor 3, which measures the temperature of hot water flowing out of the faucet 17 and outputs a signal for controlling combustion of the burner 5.

The operation of the hot water supply apparatus when the hot water is heated by the hot water supply apparatus 10 configured as described above and used is described. First, the main switches for electricity, fuel gas, water, etc. are turned on. The water supply port 1 is opened, the main power of the blower 9 is turned on, the fuel supply system is opened, and the pilot of the burner 5 of the heating device is ignited. Next, when the faucet 17 is opened and hot water supply is started, the flow of water is detected by the water amount sensor 2, the blower 9 is operated, and the burner 5 starts burning. Water supplied from the water supply port 1 passes through the heat exchange tank 6 and is heated by the combustion gas of the burner 5 in the heat exchanger 4 of the heating device. At this early stage, the tap water leaving the heat exchanger 4 is not heated, so the feedwater through the heat exchange tank 6 is not heated. When the temperature of the hot water leaving the heat exchanger 4 rises, the water supplied through the heat exchange tank 6 is also heated by the hot water, and the temperature rises. The temperature of the hot water coming out of the faucet 17 also gradually rises. Finally, the water supplied through the heat exchange tank 6 is heated by the hot water leaving the heat exchanger 4, and conversely, the hot water itself is cooled and the temperature of the hot water flowing out of the faucet reaches equilibrium.

Thereafter, once the faucet 17 is closed to stop tapping, and then the tap 17 is opened for tapping again, the flow rate of the water supply is detected by the water quantity sensor 2 and the blower 9 is turned on in the same manner as at the start of operation. To start the combustion of the burner 5.
However, in the case of restarting, the hot water remaining in the heat exchanger 4 has a considerably high temperature due to the after-boiling phenomenon due to the residual heat in the heat exchanger 4. The superheated hot water passes through the inner pipe 11 of the heat exchange tank 6 and heats the water supply passing through the outer periphery thereof, and the superheated water is cooled to alleviate the overheating.
On the other hand, since the feed water is heated and the temperature rises, the cold water discharged from the cold water sandwich is the feed water with the increased temperature, so that the cold water sandwich can be relaxed. Finally, as in the above, the temperature of the water supply and the temperature of the hot water are equilibrated, and the water can be supplied at a constant temperature. The state of this tapping temperature is shown in FIG.
(A) line. In FIG. 2, the line (b) shows the state of the hot water supply apparatus for overheating alleviation, and the dotted line (c) shows the state of the hot water supply temperature of the hot water supply apparatus for which no countermeasures are taken.

It should be noted that the present invention is not limited to the above-described embodiments, but includes those which can be modified and implemented without departing from the gist of the present invention. By the way, in the above,
The heat exchange tank has a generally double-pipe configuration, and the water-passing path is a single fin tube in which the fins 12 are provided on the outer periphery of the inner pipe 11.
A plurality of inner pipes may be provided in parallel in each water passage, or may be of a flat type. Further, the water amount sensor 2 is a water wheel type flow meter, but may be a method of detecting another flow.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a hot water supply apparatus according to the present invention, in which a tapping temperature is stabilized.

FIG. 2 is a tap water temperature graph showing a state of hot water temperature with respect to a time from the start of operation of the hot water supply apparatus.

FIG. 3 is a configuration diagram illustrating a configuration of a conventional hot water supply apparatus.

FIG. 4 is a configuration diagram illustrating the configuration of another conventional hot water supply apparatus.

[Explanation of Signs] 1 ... water supply port, 2 ... water quantity sensor, 3 ... water input thermistor, 4 ... heat exchanger, 5 ... burner, 6
... heat exchange tank, 7 ... water proportional valve, 8 ... tap water thermistor, 9 ... blower, 10 ... hot water supply device, 1
DESCRIPTION OF SYMBOLS 1 ... Inner pipe, 12 ... Fin, 13 ... Outer case, 14 ... Water supply inlet, 15 ... Water supply outlet, 16 ...
..Fin, 17 ... Faucet

Claims (4)

[Claims] 1. Heat exchange between hot water heated by a heat exchanger of a hot water supply device and water taken into a hot water supply device from a water supply port and entering a heat exchanger, and overheating is reduced by cooling the superheated hot water. And a method for stabilizing a tapping temperature of a hot water supply device, wherein the hot water is heated. 2. A water amount sensor for detecting a flow of water introduced into a hot water supply device, a heat exchanger for heating water to produce hot water, a combustion type heating device for heating the heat exchanger, and a heating device. A hot water supply device comprising a heat exchange tank for exchanging heat between incoming water and outgoing hot water. 3. The hot water supply apparatus according to claim 2, further comprising a temperature sensor for measuring a temperature of hot water at an outlet side of the heating device, and a flow rate sensor for measuring a flow rate. 4. The hot water supply apparatus according to claim 2, wherein the heat exchanger is of a type in which hot water flows into the pipe and water flows outside the pipe.