JP2000130855A - Hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance thermal efficiency while making compact the entire apparatus by mounting a heat exchanger where one water tube group is arranged, in the gap thereof, with the other water tube group. SOLUTION: A water tube group 1 being employed in the heat exchanger for an oil supply unit is arranged, in the gap thereof, with the other water tube group 2. A relation l<d is set between the pitch l of the water tubes 1a, 2a in the water tube groups 1, 2 and the outside diameter d of each water tube 1a in the water tube group 1 and the water tube groups 1, 2 are arranged at high density. The water tubes 1a, 2a in the water tube groups 1, 2 have an identical outside diameter. When such an arrangement is applied to the water tube groups 1, 2 constituting a heat exchanger, preferably a second heat exchanger, thermal efficiency can be enhanced and since the second heat exchanger is made compact, the entire oil supply unit can be made compact correspondingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact water heater having excellent heat efficiency, comprising a second heat exchanger as a drain generator and a first heat exchanger as a non-drain generator.

[0002]

2. Description of the Related Art Conventionally, most heat exchangers mounted on water heaters and the like have a structure in which fins are attached around a water pipe.
Usually, the heat efficiency is designed to be suppressed to about 80%, and copper having an extremely high thermal conductivity is exclusively used as a material for forming a water tube constituting the heat exchanger.

[0003] In order to improve the heat efficiency of this heat exchanger, various improvements have been made conventionally, for example, as shown in FIG.
A water heater as shown in FIG. 1 has been proposed. 11A and 11B show an overall configuration diagram of a heat exchanger part of a general water heater, in which FIG. 11A is a front view, FIG. 11B is a partially cutaway side view, and FIG. It is.

Now, the heat exchanger shown in FIG. 11 is generated by separating the heat exchanger into a second heat exchanger (drain generation unit) 20 and a first heat exchanger (drain non-generation unit) 21. A drain receiver 22a is provided on the inner bottom of the casing 22 so that the drain does not drip, and the drain from the drain receiver 22a can be discharged from the drain outlet 23 to the outside. Incoming water from outside the system is supplied from the water inlets 24 and 25 to the water pipe 21a on the first heat exchanger 21 side and the water pipe 20a of the second heat exchanger 20, respectively, and passes through the heat exchangers 20 and 21 through a predetermined path. And the hot water is finally discharged from the outlets 26 and 27. The drain generated on the second heat exchanger 20 side accumulates in the drain receiver 22a and is discharged from the drain outlet 23. Note that both the first and second heat exchangers 21 and 20 are preferably formed of copper water tubes.

[0005] As described above, the heat exchanger is connected to the second heat exchanger 2.
By separating the heat exchanger into the first heat exchanger 21 and the first heat exchanger 21, the thermal efficiency of the entire heat exchanger can be significantly improved.

[0006]

However, the above-mentioned second method
The water pipe 20a constituting the heat exchanger 20 is formed by bending a long metal pipe at a predetermined length, and thus requires a bending margin for bending.
As shown by 2, the pitch l of the adjacent water pipes 20a, 20a had to be greater than the outer diameter d of the pipes. That is, the relationship between the pipe pitch l between the water pipes 20a and the outer diameter d of the water pipes has to be l> d. For this reason, the water pipes 20a of the second heat exchanger 20 are arranged at a low density, and the size of the entire second heat exchanger 20 is relatively large, so that the structure of the water heater is also large. I had to become something. This is disadvantageous not only in improving the thermal efficiency of the heat exchanger, but also in producing a compact water heater.

The present invention solves the above-mentioned conventional problems, and achieves a reduction in the size of the heat exchanger mainly by arranging the water tubes constituting the second heat exchanger at a high density. Therefore, it is an object to provide a water heater that can realize high thermal efficiency and also can realize a compact apparatus as a whole.

[0008]

In order to achieve the above object, a water heater according to the present invention comprises a plurality of water pipe groups, and a heat exchanger in which one water pipe group is arranged in a gap between one water pipe group. The first feature is that it is mounted. The second feature of the water heater of the present invention is that, in addition to the first feature, the water pipe group is formed of a flexible pipe. In the water heater according to the present invention, in addition to the first or second feature, a plurality of water pipe groups are arranged and configured such that a pipe pitch of each adjacent water pipe is equal to or less than an outer diameter of the water pipe. Is the third feature. In the water heater of the present invention, in addition to the features described in any one of the first to third aspects, the heat exchanger includes a second heat exchanger as a drain generation unit and a first heat exchange as a drain non-generation unit. At least the second heat exchanger is composed of a casing and a plurality of water pipe groups housed in the casing, and the other water pipe group is arranged and arranged in a gap between one water pipe group. There is a fourth
The feature is. The fifth feature of the water heater of the present invention is that, in addition to the fourth feature, the water heater is arranged so that the outer periphery of the water pipe contacts the inner wall surface of the casing. Further, the water heater of the present invention, in addition to the fourth feature,
A sixth feature is that the water pipe is arranged to be submerged in the drain collected in the drain receiver at the bottom of the casing. Further, the water heater of the present invention has, in addition to the above-described fourth feature, a seventh feature in that the water pipe is arranged so as to be in contact with or close to the drain receiver at the inner bottom portion of the casing.

[0009]

1 to 3 show a group of water tubes of a heat exchanger used in a water heater according to the present invention. FIG. 1 (A) is a diagram showing one of the groups of water tubes viewed from the side, and FIG. 1 (B). Is a view from the front, FIG. 2A is a view from the side of the other water pipe group,
(B) is the figure seen from the front. FIG. 3 is an arrangement diagram of water tubes when the water tube groups of FIGS. 1 and 2 are combined. FIG. 4 is a configuration diagram showing the relationship between the water tubes constituting the heat exchanger of the water heater of the present invention and the inner wall surface of the casing. FIG. 5 shows a part of the water tube group constituting the heat exchanger being submerged in the drain. FIG. 6 shows another example of FIG. 5, and FIG. 6 (A) shows a part of a group of water tubes constituting a heat exchanger in contact with or in proximity to a drain receiver at the bottom of the casing. FIG. 2B is a configuration diagram showing a state in which the configuration is performed so that
It is an expanded sectional view seen from the XX line. FIG. 7 is a sectional view of a water pipe for explaining still another example of the present invention, FIG. 8 is a sectional view around a heat exchanger for explaining another example of the present invention, and FIG. 9 is still another example of the present invention. FIG. 10A is an enlarged cross-sectional view of a bent portion of a water tube of a heat exchanger, and FIG. 10B is an enlarged cross-sectional view showing a bent portion of a conventional water tube. FIG.

First, a water pipe configuration of a water heater according to an embodiment of the present invention will be described with reference to FIGS. These water tubes are generally used for a heat exchanger of a water heater as shown in FIG. Now, the water pipe group 1 shown in FIG.
The other water pipe group 2 shown in FIG. 2 is arranged and configured as shown in FIG. In this case, each water pipe 1 of the water pipe group 1
The relationship between the pipe pitch l between the pipe a and each water pipe 2a of the water pipe group 2 and the outer diameter d of each water pipe 1a of the water pipe group 1 (or each water pipe 2a of the water pipe group 2) is l <d, and the water pipe group 1 and the water pipe The group 2 can be arranged at a high density. In addition, the water pipe 1 of the water pipe group 1
a and the outer diameter of the water pipe 2a of the water pipe group 2 are the same. It is needless to say that the heat efficiency can be improved by applying the above arrangement to the water pipe groups 1 and 2 constituting the heat exchanger, preferably the second heat exchanger 20 in this manner. As the heat exchanger 20 becomes compact, the entire water heater can be made compact. Also,
Although the water tube group constituting the first heat exchanger 21 may be configured similarly to the above, the application to the second heat exchanger 20 is practical in terms of thermal efficiency.

In the above case, in particular, if each of the water tubes 1a, 2a constituting the water tube groups 1, 2 is a flexible tube formed of a flexible material, the water tube group 1 and the water tube group 2 are arranged at a high density. This is more desirable because it has the advantage of improved workability.

Referring to FIG. 4, another example of the water heater of the present invention will be described. In this example, the configuration is such that a part of the water pipes 1a (or water pipes 2a) of the water pipe group 1 (or the water pipe group 2) contacts the inner wall surface of the casing 22 of the second heat exchanger 20 mounted on the water heater. are doing. With this configuration, the heat held in the casing 22 heated by the flow of the high-temperature exhaust gas is not dissipated to the outside, and the water pipe 1a (or the water pipe 2a) in contact with the casing 22 is efficiently placed on the water pipe 1a (or the water pipe 2a) side. And effectively contribute to heat exchange. Therefore, the amount of heat radiated to the outside is reduced, and the second heat exchanger 20 can be compact and have high thermal efficiency. Although the second heat exchanger has been described in this example, a part of the water tubes of the water tube group of the first heat exchanger 21 is configured to be in contact with the inner wall surface of the casing of the first heat exchanger 21. Is also good.

Referring to FIG. 5, an example of the relationship between the water pipe and the drain of the water heater of the present invention will be described. In this example,
Casing 22 of second heat exchanger 20 mounted on water heater
The water pipe 1a (or the water pipe 2a) is arranged and arranged to be submerged in the drain collected in the drain receiver 22a on the inner bottom. The water pipe 1a (or the water pipe 2a) configured as described above and having a temperature lower than that of the drain passes through the water pipe 1a (or the water pipe 2a) submerged in the drain, so that the water pipe 1a (or the water pipe 2a) takes heat from the heated drain. Therefore, it is possible to prevent odor and smoke generated due to re-evaporation of the drain.

FIG. 6 is a modification of FIG. That is, the drain receiver 22a at the bottom of the casing 22 of the second heat exchanger 20
A water pipe 1a such as a flexible water pipe (or a water pipe 2)
The outer periphery of a) is configured to be in contact with or close to. With this configuration, the drain collected at the bottom of the casing 22 of the second heat exchanger 20 is cooled by the water pipe 1a (or the water pipe 2a), and the drain is less likely to be re-evaporated. Therefore, a white smoke phenomenon that is mistaken for a fire caused by re-evaporation of the drain does not occur. In addition, since the drain flows from the gap in the flexible water pipe, the drain does not accumulate in the water pipe part, and the corrosion is less likely to occur.

Referring to FIG. 7, another example of the water heater of the present invention will be described. In this example, the second heat exchanger 20
The ring-shaped spacer 3 for determining the interval between the water pipes is provided near the end of the water pipe 1a (or 2a) and near the bent portion. With this configuration, each water pipe 1a (or 2a) is reliably and stably arranged at a predetermined position (mainly in the vertical direction) by the support between the inner wall surface of the casing 22 of the second heat exchanger 20 and the spacer 3. can do. The spacer may be provided on the water pipe of the first heat exchanger 21.

Another example of the water heater of the present invention will be described with reference to FIG. In this example, the water pipe 1a of the water pipe group 1 constituting the second heat exchanger 20 (or the water pipe 2 of the water pipe group 2)
The arrangement density of a) is configured so that it is coarse on the upstream side of the exhaust gas flow and dense on the downstream side. Reference numeral 4 denotes a silencer for releasing exhaust gas from the first heat exchanger 21 through the second heat exchanger 20 to the outside. The exhaust gas flows in the direction shown by the arrow and is discharged. With this configuration, the exhaust gas that has passed through the first heat exchanger 21 enters the second heat exchanger 20 from a pipe portion having a low density, and enters the second heat exchanger 20 from a downstream pipe portion having a high density. 2 Pass through heat exchanger 20 and silencer 4
It is led to. In this case, since the arrangement of the water pipes 1a and 2a is made coarse on the upstream side of the water pipe groups 1 and 2 constituting the second heat exchanger 20, the exhaust gas distribution in this portion is made uniform,
Therefore, the amount of exhaust gas passing through the portion can be made uniform. Accordingly, the contact efficiency between the exhaust gas and the water pipe is improved, so that the thermal efficiency is improved.

FIG. 9 is an application example of FIG. In this example, an L-shaped heat exchanger is used as the first heat exchanger 21 mounted on the water heater. A partition plate 22c was provided downstream of the second heat exchanger 20, and a plurality of openings 22d were formed in the partition plate 22c. The partition plate 22c
Of the casing 2 of the second heat exchanger 20
A similar opening (not shown) may be formed in the second top plate 22b. The position and size of each of the above-mentioned openings are appropriately adjusted. Thus, the opening 22 is formed in the partition plate 22c (top plate 22b).
d, the hole position and the hole size of the water pipe 1 of the second heat exchanger 20 are appropriately adjusted.
The amount of exhaust gas passing through portions a and 2a can be made more uniform. As a result, the contact efficiency between the exhaust gas and the water pipe is improved, and the thermal efficiency is increased.

Next, another example of the water heater of the present invention will be described with reference to FIG. In this example, the water pipe 1a (or 2a) constituting the second heat exchanger 20
In the configuration, the flare processing is not performed on the bent part while the flare processing is performed on the straight part (the flat part 6 where the flare 5 does not exist). With such a configuration, the water pipe 1a (or 2a) can be bent at a bending pitch H1 corresponding to the outer diameter d1 of the water pipe at the bent portion. Note that d1 is the outer diameter of the water pipe, and d2 is the outer diameter of the water pipe including the flare 5. Therefore, since the water tubes 1a and 2a can be arranged at a high density, the water tube density can be increased, and the second heat exchanger 20 having high thermal efficiency can be obtained. Here, the water pipe of the second heat exchanger 20 has been described, but the water pipe of the first heat exchanger 21 can be similarly configured.

FIG. 10B shows a bent portion of a water tube constituting the second heat exchanger 20 of the related art. in this case,
Since the bent portion of the water pipe is also continuously flared (flared portion 7), a bending pitch H2 corresponding to the diameter d2 of the flare portion is required, and the bending pitch H2 is the bending pitch shown in (A). It is larger than H1. As a result, the water tube density cannot be increased, and the second heat exchanger 20 having high thermal efficiency cannot be obtained.

As described above, according to the water heater of the present invention shown in FIGS. 1 to 3, the water tube group constituting the heat exchanger is divided into a plurality of water tube groups 1 and 2, and the plurality of water tube groups 1, 2 Since the heat exchanger, preferably the second heat exchanger 20, is manufactured by a combination of the two, and more preferably, the water pipe groups 1 and 2 are made of flexible pipes, so that the water pipe density can be increased. As a result, the thermal efficiency can be improved efficiently. Moreover, by increasing the water tube density, heat exchangers,
Desirably, the second heat exchanger 20 is downsized,
Therefore, the water heater itself can be made very compact as compared with the conventional water heater.

According to the water heater of the present invention shown in the example of FIG. 4, the heat radiated to the outside of the exhaust gas is transferred to the water pipes 1a, 2a and 2b.
The heat efficiency can be effectively used for the heat exchange in the second heat exchanger 20. In addition, in the examples shown in FIGS. 5 and 6, the drain is cooled by the water pipes 1a and 2a.
The drain is less likely to re-evaporate, and has an effect of eliminating odor and white smoke caused by the re-evaporation.

Further, according to the examples shown in FIGS. 7 to 10, the performance and effect of the water heater can be further improved by adding to the configuration of the present invention.

[0023]

According to the present invention, there is provided the above construction.
According to the water heater described in (1), since a heat exchanger composed of a plurality of water pipe groups and the other water pipe group is arranged in a gap between one water pipe group is mounted, the water pipes are arranged at high density as a whole. Can be configured. Therefore, the heat efficiency of the heat exchanger can be increased, and the heat exchanger can be made compact, so that the overall size of the water heater itself can be made smaller than before. Further, since the pipes of the heat exchanger are divided into a plurality of water pipe groups, the heat exchanger can be easily manufactured. According to the water heater of the second aspect, in addition to the effect of the configuration of the first aspect, since the water pipe group is formed of a flexible pipe, the other water pipe group is provided in the gap between the one water pipe group. When arranging and configuring, since the water pipe group is a flexible pipe, its workability can be improved, and a heat exchanger using a combination of water pipe groups can be easily manufactured. According to the water heater of the third aspect, in addition to the effect of the configuration of the first or second aspect, a plurality of water pipes are arranged such that the pipe pitch of each adjacent water pipe is equal to or less than the outer diameter of the water pipe. The water pipe group is arranged and configured, so the dimensions of the heat exchanger (water heater) can be planned at the design stage of the heat exchanger and eventually the water heater, and the heat efficiency and heat of the heat exchanger as a finished product before assembly The compactness of the exchanger (water heater) can be grasped with considerable accuracy. According to the water heater of the fourth aspect, in addition to the effect of the configuration of any one of the first to third aspects, the heat exchanger includes a second heat exchanger as a drain generation unit and a drain non-condenser. A first heat exchanger as a generating unit, at least a second heat exchanger including a casing, and a plurality of water pipe groups housed in the casing, and a water pipe in the gap between one of the water pipe groups. Since the groups are arranged and configured, the device for arranging and configuring the other water tube group using the gap between the one water tube group is applied particularly to the second heat exchanger, so that the drain generation unit is exclusively used. The heat efficiency of the second heat exchanger can be dramatically improved. According to the water heater according to the fifth aspect, in addition to the effect of the configuration according to the fourth aspect, since the water pipe is arranged so that the outer periphery of the water pipe contacts the inner wall surface of the casing, high-temperature exhaust gas can be used. Heat from the heated inner wall of the casing is quickly transmitted to the water pipe, so that the heat can be effectively used, and the heat efficiency in the second heat exchanger can be improved. According to the water heater of the sixth aspect, in addition to the effect of the configuration of the fourth aspect, the water pipe is arranged so as to be submerged in the drain collected in the drain receiver at the bottom of the casing. By passing water having a lower temperature than the drain through the water pipe submerged in the drain, heat can be removed from the heated drain again, preventing odor and white smoke caused by re-evaporation of the drain. be able to. According to the water heater of the seventh aspect, in addition to the effect of the configuration of the fourth aspect, the water pipe is arranged so as to be in contact with or close to the drain receiver at the inner bottom of the casing. The drain accumulated at the bottom in the casing of the heat exchanger can be cooled by the water pipe, and the re-evaporation of the drain can be prevented, so that the white smoke caused by the re-evaporation of the drain can be eliminated.

[Brief description of the drawings]

FIG. 1 shows a water tube group of a heat exchanger used in a water heater according to the present invention, and FIG.
(B) is the figure seen from the front.

FIG. 2 shows a water pipe group of a heat exchanger used in the water heater of the present invention, wherein (A) is a view of the other water pipe group viewed from the side,
(B) is the figure seen from the front.

FIG. 3 is an arrangement configuration diagram of a water pipe when the water pipe groups of FIGS. 1 and 2 are combined;

FIG. 4 is a configuration diagram showing a relationship between a water pipe constituting a heat exchanger of the water heater of the present invention and an inner wall surface of a casing.

FIG. 5 is a configuration diagram showing a state in which a part of a group of water tubes constituting a heat exchanger is disposed so as to be submerged in a drain.

FIG. 6 shows another example of FIG. 5, in which (A) shows a state in which a part of a group of water tubes constituting a heat exchanger is configured to be in contact with or close to a drain receiver at a bottom portion inside a casing. FIG. 2B is an enlarged sectional view taken along line XX of FIG.

FIG. 7 is a sectional view of a water pipe of a heat exchanger for explaining still another example of the present invention.

FIG. 8 is a sectional view around a second heat exchanger for explaining another example of the present invention.

FIG. 9 is a cross-sectional configuration diagram near a second heat exchanger showing still another example of the present invention.

FIG. 10A is an enlarged sectional view of a bent portion of a water tube of the heat exchanger of the present invention, and FIG. 10B is an enlarged sectional view showing a bent portion of a conventional water tube.

FIG. 11 is an overall configuration diagram of a heat exchanger section of the water heater.

FIG. 12 is an arrangement diagram of a water pipe of a conventional heat exchanger.

[Explanation of symbols]

 1, 2 water pipe group 1a, 2a water pipe 3 spacer 20 second heat exchanger 21 first heat exchanger 22 casing 22a drain receiver

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryoji Kutsuna 93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Takahiro Matsuda 93, Edo-cho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. Hideo Ueda 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. In Noritz Co., Ltd.

Claims (7)

[Claims] 1. A water heater comprising a plurality of water pipe groups, and a heat exchanger having a water pipe group arranged in a gap between one water pipe group. 2. The water heater according to claim 1, wherein the water pipe group is constituted by a flexible pipe. 3. The water heater according to claim 1, wherein a plurality of water pipe groups are arranged so that a pipe pitch between adjacent water pipes is equal to or less than an outer diameter of the water pipe. 4. A heat exchanger comprising a second heat exchanger as a drain generation unit and a first heat exchanger as a drain non-generation unit, wherein at least the second heat exchanger is provided in a casing and in the casing. Composed of a plurality of water pipe groups to be housed,
The water heater according to any one of claims 1 to 3, wherein the other water pipe group is arranged in the gap between the one water pipe group. 5. The water pipe according to claim 4, wherein the outer wall of the water pipe is in contact with the inner wall surface of the casing.
The water heater described in. 6. The water heater according to claim 4, wherein the water pipe is arranged so as to be submerged in the drain collected in the drain receiver at the bottom of the casing. 7. The water heater according to claim 4, wherein the water pipe is arranged so as to be in contact with or close to the drain receiver at the inner bottom of the casing.