JP2000121080A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger which can suppress the cooling of hot water in a heat exchange pipe for supplying hot water by inserting the heat exchange pipe into a heat exchange pipe for heating in the same main body and heat-exchanging the pipe for supplying hot water by means of the pipe for heating. SOLUTION: When normal hot water supply is made, the water supplied to a hot-water heat exchanger 1 through the water inlet side of the hot water supply side of the exchanger 1 flows in the exchanger 1 through a three-way valve for circulating incoming water and makes water to flow to the hot water discharging side of the exchanger 1. Since a heat exchange pipe 7 for supplying hot water passes through the exchanger 1 positioned above a hot-water combustor 3 while the combustor 3 is in combustion, the water in the pipe 7 is subjected to heat exchange in the exchanger 1 and discharged as hot water. Since the pipe 7 is inserted into a heat exchange pipe 8 for heating so that the pipe 7 may be heat-exchanged by means of the pipe 8, the temperature of the hot water in the pipe 7 is maintained through the heat exchange with the hot water for heating in the pipe 8 and, since the hot water ascends due to heat convection, the cooling of the hot water in the pipe 7 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger of a combustor capable of performing a heating operation by hot water supply and a hot water supply operation in the same main body.

[0002]

2. Description of the Related Art Conventionally, the configuration inside a water heater has a structure as shown in FIG. During normal heating operation in the same main body, the heating fan 6 operates, and the heating circuit burns. on the other hand,
During the heating alone operation, the hot-water supply fan 5 is rotating at a low speed so as not to draw the exhaust gas from the heating-side heating exhaust unit 10 into the hot-water supply side. The hot water is cooled. At this time, when the hot water supply warming function is activated, it is determined that the water in the hot water supply heat exchange pipe 7 on the hot water supply side has dropped to a predetermined temperature or lower, and there is a problem that combustion for hot water supply warming is frequently repeated. I was

[0003] In order to prevent this, conventionally, during hot water supply warming combustion, control has been performed such that combustion has not been performed and combustion has to be suppressed until 5 minutes have elapsed after once combustion.

[0004]

However, in the prior art, during hot water supply warming combustion, control was performed so that combustion would not take place until 5 minutes or more had elapsed after combustion once, but since the amount of combustion was small, it was necessary to warm to a predetermined temperature. However, there is a problem that the combustion is continued every 5 minutes due to cooling by rotation of the hot water supply fan.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a hot water supply system for exchanging heat between a hot water supply heat exchange pipe, a heating heat exchange pipe, and the hot water supply heat exchange pipe in the same main body. A heat exchanger, a heating heat exchanger that performs heat exchange of the heating heat exchange pipe, a hot water supply combustion device that burns below the hot water supply heat exchanger, and a hot water supply fan that supplies air to the hot water supply combustion device, A heating combustion device for fueling at a lower portion of the heating heat exchanger, and a heating fan for supplying air to the heating combustion device, wherein the hot water supply heat exchange pipe is inserted into the heating heat exchange pipe, The heat exchange pipe performs heat exchange by a heating heat exchange pipe.

According to the above invention, even when the hot water supply fan is rotating at a low speed so as not to draw in the exhaust air from the heating / exhaust portion on the heating side when the heating side is performing the single combustion, the hot water supply heat exchange pipe can be used. The heat exchange pipe for hot water supply is inserted into the heat exchange pipe for heating, and the heat exchange pipe for hot water supply is configured so that heat exchange can be performed by the heat exchange pipe for heating. The heat is exchanged with the exchange pipe, the temperature of the hot water is maintained, and the hot water rises upward due to heat convection, whereby the cooling of the hot water in the heat exchange pipe for hot water supply is suppressed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first aspect of the present invention is a hot water supply heat exchange pipe, a heat exchange pipe for heating, a hot water supply heat exchanger for exchanging heat of the hot water supply heat exchange pipe, and the heating apparatus in the same main body. A heating heat exchanger for exchanging heat for a heat exchange pipe for hot water, a hot water supply combustion device burning at a lower portion of the hot water supply heat exchanger, a hot water supply fan for supplying air to the hot water supply combustion device, and a lower portion of the heating heat exchanger And a heating fan for supplying air to the heating combustion device. The heat exchange pipe for hot water supply is inserted into the heat exchange pipe for heating, and the heat exchange pipe for hot water supply is a heating heat exchange pipe. Thus, a structure capable of performing heat exchange is provided.

According to the above invention, even when the hot water supply fan is operating so as not to suck the exhaust gas from the heating / exhaust portion on the heating side into the hot water supply side when the heating side is performing single combustion, the heat exchange pipe for hot water supply is provided. Is inserted into the heat exchange pipe for heating, and the heat exchange pipe for hot water supply is configured so that heat can be exchanged by the heat exchange pipe for heating. Heat is exchanged with the heat exchange pipe, the temperature of the hot water is maintained, and the hot water rises upward due to heat convection, thereby suppressing cooling of the hot water in the hot water supply heat exchange pipe.

In a second aspect of the present invention, by providing a circulation three-way valve and a circulation pump, the circulation three-way valve is switched, the inside of the hot water supply heat exchange pipe is closed, and the circulation pump is operated to close the inside of the closed loop. By circulating water, the hot water in the hot water supply heat exchange pipe can be circulated more than the amount of circulation by convection, and the hot water in the hot water supply heat exchange pipe is kept uniform.

According to the third aspect of the present invention, the heat exchange pipe is provided with a heat insulating material for preventing the cooling of the hot water supply heat exchange pipe, so that heat can be prevented from being taken away when the hot water supply fan is operated. Suppresses cooling of hot water in the heat exchange pipe.

In the fourth invention, the heat exchange pipe for hot water supply is inserted into the heat exchange pipe for heating, and the heat exchange pipe for hot water supply is provided in a configuration in which heat exchange can be performed by the heating heat exchange pipe.
In addition, by providing a heat insulating material in the hot water supply heat exchange pipe to prevent cooling of the hot water supply heat exchange pipe, the heat insulation effect of the hot water in the hot water supply heat exchange pipe can be maintained only by intermittently circulating the pump. By reducing the number of circulations, the power consumption of the pump can be reduced.

In the fifth invention, the hot water in the hot water supply heat exchange pipe is kept warm by operating the hot water supply freeze prevention heater on the hot water supply side, and the hot water in the hot water supply heat exchange pipe is supplied to the hot water supply fan. Cooling by the wind can be suppressed, and the hot water in the hot water supply heat exchange pipe can be suppressed from being cooled without changing the conventional configuration.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic view of the configuration of a heat exchanger according to Embodiment 1 of the present invention.

In the drawing, at the time of normal hot water supply and discharge, water that has entered from the water inlet side of the hot water supply side passes through a three-way valve 11 (not shown) for circulating water, flows into the hot water supply heat exchanger 1, and then to the hot water supply side. And the water can flow. Further, since the hot water supply heat exchange pipe 7 passes through the inside of the hot water supply heat exchanger 1 above the hot water supply combustion device 3 during combustion, the water in the hot water supply heat exchange pipe 7 is heated in the hot water supply heat exchanger 1. It is exchanged and discharged as hot water.

Further, the heat exchange pipe 7 for hot water supply is inserted into the heat exchange pipe 8 for heating, and the heat exchange pipe 7 for hot water supply is configured to be capable of exchanging heat with the heat exchange pipe 8 for heating. The hot water in the heat exchange pipe 7 is heat-exchanged from the heating hot water to the hot water supply heat exchange pipe 8 to maintain the temperature of the hot water and to rise upward by convection of heat, so that the hot water supply heat exchange pipe The inside hot water can be suppressed from being cooled.

(Embodiment 2) FIG. 2 is a schematic view showing the configuration of a heat exchanger according to Embodiment 2 of the present invention. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted. The difference from the first embodiment is that a circulation three-way valve 11 and a circulation pump 12 are provided.

In FIG. 1, a hot water supply heat exchange pipe 7 is inserted into a heating heat exchange pipe 8, and the hot water supply heat exchange pipe 7 is inserted.
Is configured so that heat can be exchanged by the heat exchange pipe 8 for heating, the hot water in the heat exchange pipe 7 for hot water supply is heat-exchanged from hot water for heating to the heat exchange pipe 8 for hot water supply to maintain the temperature of the hot water. In addition, by providing the circulation three-way valve 11 and the circulation pump 12, when the hot-water supply operation is not performed, the circulation three-way valve 11 is switched to the direction of the hot-water supply bypass pipe 13, so that the water circuit is connected to the hot-water supply heat exchange pipe 7. A closed loop is formed inside, and water does not flow to the tapping side,
2 can be circulated in the closed loop. By operating the circulation pump 12 and circulating in the closed loop, the hot water in the hot water supply heat exchange pipe 7 can be circulated more than the circulation by convection, and the hot water in the hot water supply heat exchange pipe 7 is kept uniform. be able to.

(Embodiment 3) FIG. 3 is a schematic view showing the structure of a heat exchanger according to Embodiment 1 of the present invention. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

In the figure, a heat insulating material 14 for preventing cooling of the hot water supply heat exchange pipe 7 is provided on the hot water supply heat exchange pipe 7, thereby preventing heat radiation of the heated hot water in the hot water supply heat exchange pipe 7. Heat is prevented from being taken away when the hot water supply fan 5 is operated, and cooling of the hot water in the hot water supply heat exchange pipe 7 is suppressed.

(Embodiment 4) FIG. 4 is a schematic structural view of a heat exchanger according to Embodiment 4 of the present invention. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted. The difference from the first embodiment is that a heat insulating material 14 for preventing the cooling of the circulation three-way valve, the circulation pump and the hot water supply heat exchange pipe is provided.

In the figure, the heat exchange pipe 7 for hot water supply is inserted into the heat exchange pipe 8 for heating, and the heat exchange pipe 7 for hot water supply is constituted so that heat exchange can be performed by the heat exchange pipe 8 for heating. The hot water in the heat exchange pipe 7 is heat-exchanged from hot water on the heating side to the hot water supply heat exchange pipe 8 to maintain the temperature of the hot water and to provide the circulation three-way valve 11 and the circulation pump 12 to supply hot water. When the operation is not performed, the water circuit becomes a closed loop by switching the three-way valve for circulation 11 toward the hot water supply bypass pipe 13 so that water does not flow to the tapping side. Can be circulated. Circulation pump 1
2 can be circulated in the closed loop by operating the hot water in the closed loop, so that the hot water in the hot water supply heat exchange pipe 7 can be circulated more than the circulation by convection, and the temperature of the hot water in the hot water supply heat exchange pipe 7 can be kept uniform. Can be. Further, by providing a heat insulating material 14 for preventing cooling of the hot water supply heat exchange pipe 7 to the hot water supply heat exchange pipe 7, the heat exchange pipe 7 can be intermittently circulated only by intermittently circulating the circulation pump 11 by the heat insulation effect. By keeping the heat insulation of the hot water inside and reducing the number of circulations, the power consumption of the circulation pump 12 can also be suppressed.

(Embodiment 5) FIG. 5 is a schematic view showing the structure of a heat exchanger according to Embodiment 5 of the present invention.

In the drawing, at the time of normal hot water supply and dewatering, water entering from the water inlet side of the hot water supply side passes through a three-way valve 11 (not shown) for circulation of water, flows into the hot water supply heat exchanger 1, and then to the hot water outlet side. And the water can flow. Further, since the hot water supply heat exchange pipe 7 passes through the inside of the hot water supply heat exchanger 1 above the hot water supply combustion device 3 during combustion, the water in the hot water supply heat exchange pipe 7 is heated in the hot water supply heat exchanger 1. It is exchanged and discharged as hot water.

By operating the heater 15 for preventing freezing for hot water supply at the time of heating combustion and at the time of stopping the hot water supply, the hot water in the hot water supply heat exchange pipe 7 is kept warm by the effect of the heater 15 for preventing hot water supply from freezing. The hot water in the replacement pipe 7
Cooling by the wind of the hot-water supply fan 5 can be suppressed, and the hot water in the hot-water supply heat exchange pipe 7 can be suppressed from being cooled without changing the conventional configuration.

[0026]

As described above, the present invention has the following advantageous effects.

(1) The heat exchange pipe for hot water supply is inserted into the heat exchange pipe for heating, and the heat exchange pipe for hot water supply is configured so that heat exchange can be performed by the heat exchange pipe for heating.
The hot water in the hot water supply pipe is exchanged from the hot water for heating to the heat exchange pipe for hot water supply, the temperature of the hot water is maintained, and the hot water rises upward due to heat convection. The inside hot water can be suppressed from being cooled.

(2) By providing the circulation three-way valve and the circulation pump, the circulation three-way valve is switched so that the inside of the heat exchange pipe for hot water supply is closed and the circulation pump is operated to circulate the inside of the closed loop. Thereby, the hot water in the heat exchange pipe for hot water supply can be circulated more than the circulation by convection, and the hot water in the heat exchange pipe for hot water supply can be kept uniform.

(3) By providing a heat insulating material for preventing the cooling of the hot water supply heat exchange pipe to the hot water supply heat exchange pipe,
Heat can be prevented from being deprived when the hot water supply fan is operated, and cooling of the hot water in the hot water supply heat exchange pipe can be suppressed. In addition, a warming effect can be obtained even during normal operation, and the amount of combustion at the time of hot water re-starting can be suppressed to a predetermined temperature.

(4) The heat exchange pipe for hot water supply is inserted into the heat exchange pipe for heating, the heat exchange pipe for hot water supply is configured to be capable of exchanging heat with the heating heat exchange pipe, and the heat exchange pipe for hot water supply is cooled. By providing a heat insulating material in the hot water supply heat exchange pipe to prevent heat, it is possible to maintain the heat insulation of the hot water in the hot water supply heat exchange pipe simply by intermittently circulating the pump due to the heat insulation effect, and reduce the number of circulations Thus, power consumption of the pump can be suppressed.

(5) By operating the hot water supply freezing prevention heater, the hot water in the hot water supply heat exchange pipe is kept warm, and the hot water in the hot water supply heat exchange pipe is cooled by the wind of the hot water supply side fan. Can be suppressed, and the hot water in the hot water supply heat exchange pipe can be easily suppressed from being cooled without changing the conventional configuration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of a heat exchanger according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a heat exchanger according to a third embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a heat exchanger according to a fourth embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a heat exchanger according to a fifth embodiment of the present invention.

FIG. 6 is a schematic diagram of a configuration of a conventional heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water supply heat exchanger 2 Heating heat exchanger 3 Hot water supply combustion device 4 Heating combustion device 5 Hot water supply fan 6 Heating fan 7 Hot water supply heat exchange pipe 8 Heating heat exchange pipe 9 Hot water supply exhaust part 10 Heating exhaust part 11 Circulation 3 Way valve 12 Circulation pump 13 Hot water supply bypass pipe 14 Insulation material 15 Heater for freezing prevention for hot water supply

Claims (5)

[Claims] 1. A heat exchange pipe for hot water supply, a heat exchange pipe for heating, a heat exchange pipe for heat exchange of the heat exchange pipe for hot water, and a heat exchange pipe for heat exchange for heating in the same main body. A heating heat exchanger to be performed, a hot water supply combustion device that burns below the hot water supply heat exchanger, a hot water supply fan that supplies air to the hot water supply combustion device, and a heating combustion device that burns below the heating heat exchanger. A heating fan for supplying air to the heating combustion device, wherein the hot water supply heat exchange pipe is inserted into the heating heat exchange pipe, and the hot water supply heat exchange pipe is heat-exchanged by the heating heat exchange pipe. A heat exchanger. 2. The heat exchanger according to claim 1, further comprising a circulation three-way valve and a circulation pump. 3. The heat exchanger according to claim 1, wherein a heat insulating material for preventing cooling of the hot water supply heat exchange pipe is provided on the hot water supply heat exchange pipe. 4. The heat exchanger according to claim 2, wherein a heat insulating material for preventing cooling of the hot water supply heat exchange pipe is provided on the hot water supply heat exchange pipe. 5. A heat exchange pipe for hot water supply, a heat exchange pipe for heating, a hot water supply heat exchanger for exchanging heat of the heat exchange pipe for hot water, and a heat exchange for the heat exchange pipe for heating in the same main body. A heating heat exchanger to be performed, a hot water supply combustion device that burns below the hot water supply heat exchanger, a hot water supply fan that supplies air to the hot water supply combustion device, and a heating combustion device that burns below the heating heat exchanger. A heat exchanger including a heating fan for supplying air to the heating combustion device and a hot water supply freeze prevention heater for preventing freezing of a hot water supply heat exchange pipe.