JPH0960974A - Heat exchanger for hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for a hot water supply device capable of avoiding the hot water of a high temperature from being unexpectedly supplied and preventing the deterioration of the heat exchanger by commonly using employed parts, thereby making the device compact, lowering a cost and preventing the heat exchanger from being unnecessarily heated. SOLUTION: A heat exchanger 1 for supplying hot water and a burner 2 for heating the heat exchanger 1 are provided. The heat exchanger 1 and the burner 2 are provided in a combustion chamber 3. The heat exchanger 1 comprises first heat exchangers 6 and second heat exchangers 8. The first heat exchangers 6 and the second heat exchangers 8 are arranged along the transverse direction of the combustion chamber 3. The burner 2 comprises first burners 9 and second burners 10. The first burners 9 and the second burners 10 are arranged along the transverse direction of the combustion chamber 3. The first burners 9 are arranged corresponding to the first heat exchangers 6 and the second burners 10 are arranged corresponding to the second heat exchangers 8, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a heat exchanger for hot water supply and a burner for heating the heat exchanger, and the heat exchanger and the burner are arranged in a combustion chamber to, for example,
The present invention relates to a heat exchanger of a hot water supply device which is configured to supply hot water to a general hot water tap, a bathtub, or the like, or to supply water to a heating device.

[0002]

2. Description of the Related Art Taking a hot water supply device capable of supplying hot water to a general hot water tap and a bathtub as an example, conventionally, a heat exchanger for general hot water supply and a burner are arranged in one combustion chamber to provide a bath. A so-called two-can-two-water type is generally known in which the heat exchanger and the burner are disposed in separate combustion chambers. However, such a two-can, two-water type is, after all, the same as having two hot water supply devices, and thus has a drawback that the parts used are inevitably wasteful and costly. In order to eliminate such a drawback, a heat exchanger for general hot water supply and a heat exchanger for bath are arranged in one combustion chamber, and only one burner is arranged in the combustion chamber. There is also known a burner configured so as to be used both as a general hot water supply burner and a bath burner.

[0003]

However, in the case of using a single burner as a dual burner, it is possible to reduce the cost by using shared parts, but for example, when burning the general hot water, the burner is burned for general hot water supply. When the heat exchanger is heated, the bath heat exchanger is also heated at the same time, and the hot water temperature rises in the bath heat exchanger. There is an inconvenience that hot water is supplied to the bathtub, and vice versa, and there is a disadvantage that hot water having a temperature higher than necessary is supplied during general hot water supply. Furthermore, as described above, when either one of the general hot water supply and the hot water supply to the bathtub is performed, the other heat exchanger, which is unnecessary, is also heated at the same time. As a result, there is also a drawback of promoting deterioration of the heat exchanger.

The present invention focuses on such a conventional problem, and an object thereof is to reduce the size and cost of the apparatus by sharing the parts to be used, and yet to eliminate unnecessary heat exchangers. It is intended to provide a heat exchanger of a hot water supply device capable of preventing the heating of hot water as much as possible by preventing heating as much as possible and preventing deterioration of the heat exchanger.

[0005]

In order to achieve this object, according to the invention described in claim 1, the heat exchanger for hot water supply comprises a first heat exchanger and a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged along the transverse direction of the combustion chamber, and the burner for heating the heat exchanger is composed of the first burner and the second burner. One burner and a second burner are arranged along the transverse direction of the combustion chamber, the first heat exchanger corresponds to the first burner, and the second heat exchanger corresponds to the second burner. Since it is installed as a single unit, the first heat exchanger is used as much as possible during the first burner combustion, and the first heat exchanger is used as much as possible during the second burner combustion, while using a common combustion chamber to reduce the size and cost of the device. Only the two heat exchangers can be heated and unexpectedly high temperature hot water is supplied as in the past. It is small and also can be prevented the deterioration of the heat exchanger.

According to the second aspect of the present invention, the first heat exchanger and the second heat exchanger are constituted by fin-tube type heat exchangers, and the heat transfer fins and the second heat exchanger of the first heat exchanger are formed. Since the heat transfer fins of the heat exchanger are integrally formed and shared, the cost required for manufacturing the heat transfer fins can be reduced as compared with the case where the heat transfer fins are separately formed. In addition, the labor required for assembling the heat transfer fins can be simplified, and the cost can be reduced accordingly.

According to the third aspect of the present invention, the cross section of the entire heat exchanger has a rectangular shape, and a plurality of heat transfer fins are arranged along the long sides of the rectangle. The number of heat transfer fins can be reduced as compared with the case where heat transfer fins are arranged along the short side of the heat transfer fin, thereby reducing the manufacturing cost and simplifying the labor required for assembling the heat transfer fin. Can be planned. Then, along the long side of the rectangle, since the heat transfer tube of the first heat exchanger and the heat transfer tube of the second heat exchanger are arranged separately, a plurality of sheets along the long side of the rectangle are arranged. The heat transfer tubes of the first and second heat exchangers can be made to penetrate the heat transfer fins of, and each heat transfer tube and heat transfer fin can be manufactured relatively easily, and The heating of each heat burner by each burner can be efficiently performed.

According to the invention described in claim 4, since the first heat exchanger and the first burner are for general hot water supply and the second heat exchanger and the second burner are for bath, The heat exchanger for general hot water supply and the heat exchanger for bath, which are in high demand even at home, can be provided at a low cost in the state of little deterioration as described above.

According to the fifth aspect of the invention, the general hot water supply burner generates a larger amount of heat than the bath burner, so that it is particularly easy to use during general hot water supply, which is more frequently used than the bath. , It is possible to provide a heat exchanger suitable for actual use.

According to the invention as set forth in claim 6, since the water inlet pipe to the general hot water supply heat exchanger is spirally arranged along the outer peripheral surface of the combustion chamber, the general hot water supply which is frequently used. At that time, the water inlet pipe can reliably cool the combustion chamber and preheat the water in the water inlet pipe.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a heat exchanger of a water heater according to the present invention will be described with reference to the drawings. FIG. 1 shows an outline of the whole hot water supply apparatus, which comprises a heat exchanger 1 for hot water supply and a burner 2 for heating the heat exchanger 1, and the heat exchanger 1 and the burner 2 Are arranged in one combustion chamber 3. The heat exchanger 1 is a fin-tube type heat exchanger including heat transfer fins and heat transfer tubes, and the heat exchanger 1 as a whole has a rectangular cross-sectional shape, and also has a rectangular cross-sectional shape. It is arranged in the upper part of the chamber 3.

The heat exchanger 1 includes a heat exchanger 6 for general hot water supply as a first heat exchanger for heating water from a water supply pipe 4 to supply water to a general hot water tap 5 or a shower, and a bathtub 7. And a bath heat exchanger 8 as a second heat exchanger for reheating the hot water, and, as shown in detail in FIG. 2, the heat transfer fins 6a of the general hot water supply heat exchanger 6 and the bath heat exchanger. The heat transfer fins 8a of the heat exchanger 8 are integrally formed, and the plurality of integrally formed heat transfer fins 6a, 8a are
It is arranged along the long side of the heat exchanger 1 having a rectangular cross section. The heat transfer tube 6b of the general hot water supply heat exchanger 6 and the heat transfer tube 8b of the bath heat exchanger 8 are distributed right and left along the long side of the heat exchanger 1 having a rectangular cross section, and , Heat transfer tube 6b of heat exchanger 6 for general hot water supply
Are arranged so as to penetrate the heat transfer fins 6a of the general hot water supply heat exchanger 6, and the heat transfer tubes 8b of the bath heat exchanger 8 penetrate the heat transfer fins 8a of the bath heat exchanger 8, respectively.

A burner 2 for heating the heat exchanger 1.
Also comprises a general hot water supply burner 9 as a first burner for heating the general hot water heat exchanger 6 and a bath burner 10 as a second burner for heating the bath heat exchanger 8, These general hot water supply burner 9 and bath burner 10
In addition, the burner 9 for hot water supply is arranged along the long side of the combustion chamber 3 having a rectangular cross section, and the burner 9 for hot water supply is provided below it so as to correspond to the heat exchanger 6 for hot water supply.
Are respectively arranged below the bath heat exchanger 8 so as to correspond to the bath heat exchanger 8. The general hot water supply burner 9 and the bath burner 10 are configured such that the general hot water supply burner 9 generates a larger amount of heat, and correspondingly, the general hot water supply heat exchanger 6 has a bath The general-purpose hot water heat exchanger 6 and the bath heat exchanger 8 and the general hot-water supply burner 9 and the bath burner 10 are configured to be larger than the general-purpose heat exchanger 8. Is arranged in the combustion chamber 3 and the combustion air is supplied to the combustion chamber 3 by one fan 11.

The water supply pipe 4 is connected to a water intake pipe 12 of a general heat exchanger 6 for hot water supply, and the water intake pipe 12 is connected to the combustion chamber 3.
Is arranged in a spiral shape along the outer peripheral surface of the, and the other end is connected to the heat transfer tube 6b of the general hot water supply heat exchanger 6, and the other end of the heat transfer tube 6b is connected via the hot water discharge pipe 13. The water supply pipe 4 and the hot water supply pipe 14 are connected to each other via a bypass pipe 15.
The water supply pipe 4 has a thermistor 16 for detecting the incoming water temperature.
And a water amount sensor 17 for detecting the water flow amount, and a mixing valve 18 is provided at a connection portion between the hot water supply pipe 14 and the bypass pipe 15. The mixing valve 18 is for mixing the two while adjusting the ratio of the amount of hot water from the hot water outlet pipe 13 and the amount of water from the bypass pipe 15 to obtain hot water of a desired temperature. It is operated by an electric motor. The hot water supply pipe 14 downstream of the mixing valve 18 is provided with a thermistor 19 for detecting the temperature of the hot water after being mixed by the mixing valve 18, and the hot water tap 5 is located near the hot water tap 5. A water flow switch 20 is provided to detect that the opening operation has been performed.

A return pipe 22 for reheating and circulating is connected to the bathtub 7 through an adapter 21. The return pipe 2
2 is connected to the water inlet pipe 23 of the bath heat exchanger 8, the water inlet pipe 23 is connected to the heat transfer tube 8b of the bath heat exchanger 8, and the other end of the heat transfer tube 8b is
It is connected to a forward pipe 25 for additional heating circulation via a hot water pipe 24. Mixing valve 18 of the hot water supply pipe 14
The downstream side and the return pipe 22 are communicatively connected via an electromagnetic opening / closing valve 26, a backflow prevention hopper 27, and a check valve 28.
A thermistor 29 for detecting the temperature of the hot water in the bathtub 7 is provided in the return pipe 22 upstream of the connection point, and the return pipe 2
2, a water flow switch 30 for detecting that hot water or more has flowed, a two-way valve 31, a water level sensor 32 for detecting the water level in the bathtub 7, a circulation pump 33 for reheating, and the like are provided in this order. In addition, the outflow pipe 25 is provided with a thermistor 34 that detects the temperature of the hot water after reheating.

The burner 2 is configured to be supplied with fuel gas for general households through a gas supply pipe 35,
The gas supply pipe 35 is provided with a disconnecting valve 36 for connecting and disconnecting the supply of the fuel gas, and on the downstream side of the disconnecting valve 36, a general hot water supply gas supply pipe 37 for supplying the fuel gas to the general hot water supply burner 9 is provided. , A bath gas supply pipe 38 for supplying fuel gas to the bath burner 10, and these general hot water supply gas supply pipe 37 and bath gas supply pipe 38 are
Electromagnetic proportional valves 39 and 40 for adjusting the gas supply amount are respectively provided. The general hot water supply burner 9 is provided with an igniter 41 for igniting the burner 9 and a frame rod 42 for detecting ignition of the burner 9. Similarly, the bath burner 10 also has an igniter 43. And a frame rod 44 are provided.

The operation of the hot water supply apparatus having such a configuration is entirely controlled by the control unit C, and the control unit C is instructed from the main controller 45 and the bath controller 46 which can communicate by wire or wirelessly. Is configured. Therefore, the main controller 4
5 is an operation switch 4 for instructing start or stop of hot water supply.
7. Temperature setting switch 48 for setting hot water supply temperature, bath 7
A hot-water filling switch 49 for instructing hot water filling is provided, and the bath controller 46 is provided with a temperature setting switch 50, a hot-water filling switch 51, and the like for setting the reheating temperature and the heat retention temperature.

Next, the control operation of the hot water supply apparatus by the control unit C will be briefly described. First, when the operation switch 47 of the main controller 45 is turned on and the hot water tap 5 is opened, the general hot water supply mode is set. In this general hot water supply mode, when the water amount sensor 17 detects the flow of water of a set amount or more, the fan 11 is driven and the gas supply pipe 35
Open the on-off valve 36 of the and the gas supply pipe 3 for general hot water supply
The solenoid proportional valve 39 of No. 7 is adjusted, and the general hot water supply burner 9 is ignited by the igniter 41. The hot water heated by the general hot water supply heat exchanger 6 with the combustion of the general hot water supply burner 9 is
The water is discharged from the hot water tap 5 through the hot water supply pipe 14, at which time the water temperature is detected by the thermistor 16 of the water supply pipe 4 and the hot water temperature is detected by the thermistor 19 of the hot water supply pipe 14, and the mixing valve 18 is controlled based on the detection result. Then, the water from the bypass pipe 15 is mixed, and the hot water temperature set by the temperature setting switch 48 of the main controller 45 is maintained and discharged. When the hot water supply tap 5 is closed, the electromagnetic proportional valve 39 is closed in accordance with the detection by the water amount sensor 17, the combustion of the general hot water supply burner 9 is stopped, and the fan 11 is also stopped after a lapse of a certain time.

When the operation switch 47 of the main controller 45 is turned on and the water filling switch 49 of the main controller 45 or the water filling switch 51 of the bath controller 46 is turned on, the water filling mode is set. In this hot water filling mode, the electromagnetic opening / closing valve 26 is opened, and the two-way valve 31 enables the reverse flow of the return pipe 22. As in the case of the general hot water supply mode, the general hot water supply heat exchanger 6 is By-pass pipe 15 heated by mixing valve 18
The hot water after the water from the two is mixed from both the return pipe 22 and the forward pipe 25 as shown by the broken line in FIG.
It is supplied into the bathtub 7 via 1. The hot water temperature at this time is
The temperature is set by the temperature setting switch 50 of the bath controller 46.

When the hot water tap 5 is opened during the filling operation, the water flow switch 20 is turned on to stop the filling operation and switch to the general hot water supply mode. That is, the general hot water supply mode is executed prior to the hot water filling mode, and when the hot water tap 5 is closed and the water flow switch 20 is turned off, the hot water filling mode is executed again. In this way, when a predetermined amount of hot water is supplied to the bathtub 7, the water level sensor 32 detects it and the electromagnetic proportional valve 39 is closed based on the detection result, and the combustion of the general hot water supply burner 9 is performed. Is stopped, the fan 11 is also stopped, and the filling of water is completed.

After completion of the filling with water, the reheating mode is automatically set, the electromagnetic opening / closing valve 26 is closed, and the two-way valve 3 is closed.
1 is switched and the circulation pump 33 is driven. By driving this circulation pump 33, the hot and cold water in the bathtub 7
It is circulated as shown by the solid line in FIG. 1, and the temperature of the hot water is detected by the thermistor 29 of the return pipe 22. If the temperature detected by the thermistor 29 has almost reached the temperature set by the temperature setting switch 50 of the bath controller 46, the circulation pump 33 is stopped. After detecting the flow of the air, the fan 11 is driven, the electromagnetic proportional valve 40 of the bath gas supply pipe 38 is opened, and the igniter 43 ignites the bath burner 10 to execute additional heating. The hot water heated in the bath heat exchanger 8 with the combustion of the bath burner 10 is supplied into the bathtub 7 through the outflow pipe 25,
When the temperature detected by the thermistor 29 reaches the set temperature, the electromagnetic proportional valve 40 is closed and the combustion of the bath burner 10 is stopped. Then, the fan 11 is stopped and the circulation pump 33 is also stopped. The burning is complete.

[Other Embodiments] In the above-described embodiment, the first heat exchanger 6 and the first burner 9 are for general hot water supply, and the second heat exchanger 8 and the second burner 10 are for bath.
Although the structure in which the general hot water supply and the bath use are combined is shown, various changes can be made in actual implementation, such as combining the general hot water supply and the heating use, or combining the heating and the bath use. . At that time, the overall cross-sectional shape of the heat exchanger 1 is not limited to the above-mentioned rectangle,
Various cross-sectional shapes such as a square shape and an L-shape can be implemented. Further, the heat transfer fins 6a of the first heat exchanger 6 and the heat transfer fins 8a of the second heat exchanger 8 do not necessarily have to be integrally formed, and in some cases, the first heat exchanger 6
Alternatively, the heat transfer fin 6a and the heat transfer fin 8a of the second heat exchanger 8 may be separately formed.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of the entire hot water supply apparatus.

FIG. 2 is a perspective view of a heat exchanger.

[Explanation of symbols]

 1 Heat Exchanger 2 Burner 3 Combustion Chamber 6 First Heat Exchanger 6a Heat Transfer Fins of First Heat Exchanger 6b Heat Transfer Tube of First Heat Exchanger 8 Second Heat Exchanger 8a Heat Transfer of Second Heat Exchanger Fin 8b Heat transfer tube of second heat exchanger 9 First burner 10 Second burner 12 Water inlet pipe to first heat exchanger

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Nakamura 1-152 Minami-shi Oka, Minato-ku, Osaka, Osaka Prefecture Harman Co., Ltd. (72) Inventor Makoto Sano 1-152 Oka, Minami-shi, Minato-ku, Osaka Prefecture, Osaka Issue Harman Co., Ltd.

Claims (6)

[Claims] 1. A heat exchanger (1) for hot water supply and a burner (2) for heating the heat exchanger (1), which burns the heat exchanger (1) and the burner (2). A heat exchanger for a hot water supply device arranged in a chamber (3), wherein the heat exchanger (1) comprises a first heat exchanger (6) and a second heat exchanger (8). The first heat exchanger (6) and the second heat exchanger (8) are arranged along the transverse direction of the combustion chamber (3), and the burner (2) is connected to the first burner (9). And a second burner (10), the first burner (9) and the second burner (10) are arranged along the transverse direction of the combustion chamber (3), and the first heat exchange is performed. A heat exchanger of a hot water supply device, wherein a first burner (9) is arranged in the vessel (6) and a second burner (10) is arranged in the second heat exchanger (8) in association with each other. 2. The first heat exchanger (6) and the second heat exchanger (8) are composed of fin-tube type heat exchangers, and the heat transfer fins of the first heat exchanger (6) ( The heat exchanger for a hot water supply device according to claim 1, wherein the heat exchanger fins (8a) of the second heat exchanger (8) are integrally formed and shared. 3. The entire heat exchanger (1) has a rectangular transverse cross section, and a plurality of heat transfer fins (6a), (8a) are arranged along the long side of the rectangle, and the rectangle is formed. Along the long side of the heat transfer tube (6b) of the first heat exchanger (6) and the heat transfer tube (8) of the second heat exchanger (8).
The heat exchanger for a hot water supply apparatus according to claim 2, wherein the heat exchanger is arranged separately from b). 4. The first heat exchanger (6) and the first burner (9) are heat exchangers and burners for general hot water supply, and the second heat exchanger (8) and the second burner (10). The heat exchanger for a hot water supply apparatus according to claim 1, 2 or 3, wherein) is a heat exchanger for a bath and a burner. 5. The heat exchanger according to claim 4, wherein the general hot water supply burner (9) generates a larger amount of heat than the bath burner (10). 6. The water heater according to claim 5, wherein the water inlet pipe (12) to the general hot water heat exchanger (6) is spirally arranged along the outer peripheral surface of the combustion chamber (3). Heat exchanger.