JP7077078B2 - Water heater and latent heat exchanger - Google Patents

Description

The present invention relates to a one-can, two-water channel type hot water supply device and a latent heat exchanger included in the hot water supply device.

A hot water supply device having a heat exchanger can reheat the hot water in the bathtub by piping a reheating circuit in which the hot water in the bathtub circulates in the heat exchanger, and is for hot water supply connected to the water pipe. By piping the circuit in the heat exchanger, tap water flowing through the hot water supply circuit can be heated to supply hot water to the hot water outlet of the kitchen or washroom. Patent Documents 1 and 2 describe specific examples of a hot water supply device that heats hot water in a reheating circuit and tap water in a hot water supply circuit.

The hot water supply device described in Patent Document 1 includes two burners and two heat exchangers corresponding to the two burners, respectively, and one burner and the heat exchanger heat the hot water in the bathtub flowing in the reheating circuit. Then, the other burner and heat exchanger heat the tap water flowing through the hot water supply circuit. This hot water supply device has the advantage that the heating level of the hot water in the bathtub flowing in the reheating circuit and the heating level of tap water in the hot water supply circuit can be kept optimal by adjusting the combustion of each burner. There is a demerit that the manufacturing cost is high because the burner and heat exchanger dedicated to the reheating circuit and the burner and heat exchanger dedicated to the hot water supply circuit are provided.

On the other hand, the hot water supply device described in Patent Document 2 is a one-can, two-water channel type device that heats hot water in a reheating circuit and tap water in a hot water supply circuit with a common heat exchanger and a burner. Compared with the hot water supply device described in Document 1, the manufacturing cost can be suppressed. The hot water supply device described in Patent Document 2 includes a visible heat exchanger (primary heat exchanger) and a latent heat exchanger (secondary heat exchanger) in order to increase the heat exchange efficiency.

Japanese Unexamined Patent Publication No. 2000-205647 Japanese Unexamined Patent Publication No. 2007-120865

By the way, from the viewpoint of safety, the temperature of the hot water sent to the bathtub by reheating needs to be a predetermined temperature (for example, 60 ° C.) or less. In this regard, the one-can, two-water channel type hot water supply device exchanges heat before the start of reheating when the hot water in the bathtub is reheated while the tap water in the hot water supply circuit is heated by the combustion of the burner. The hot water in the reheating circuit that was heated in the vessel will be supplied to the bathtub. Therefore, the one-can-two-water channel type hot water supply device is required to be designed to prevent the hot water heated in the heat exchanger before the start of reheating from flowing into the bathtub in a state where the temperature exceeds a predetermined temperature.

In the one-can, two-water channel type hot water supply device equipped with a sensible heat exchanger and a latent heat exchanger, the hot water in the reheating circuit, which was heated in the heat exchanger before the start of reheating, is changed by the start of reheating. Special attention is required because the heat flows into the bath after being further heated by the lucid heat exchanger.
The present invention has been made in view of such circumstances, and is a one-can, two-water channel type hot water supply device for preventing the hot water flowing into the bathtub from exceeding a predetermined temperature during reheating operation, and the latent heat provided in the hot water supply device. The purpose is to provide a heat exchanger.

The hot water supply device according to the first invention according to the above object includes a burner unit for generating combustion gas, a visible heat exchanger having a cover body A, and a latent heat heat exchanger having a cover body B. In the hot water supply device that heats the hot water of the hot water supply circuit that supplies hot water to the sprue and the hot water of the reheating circuit that circulates the hot water in the bathtub with the combustion gas, a part of the hot water supply circuit is contained in the cover body A. A tube C and a tube D that is a part of the reheating circuit are arranged, and a tube E that is a part of the hot water supply circuit and a tube that is a part of the reheating circuit are arranged in the cover body B. F is arranged, and the pipe F is arranged on the downstream side of the pipe E along the flow of the combustion gas in the cover body B.

In the hot water supply device according to the first invention, it is preferable that the volume inside the pipe E is larger than the volume inside the pipe F.

In the hot water supply device according to the first invention, it is preferable that the pipe D is arranged on the downstream side of a part or the whole of the pipe C along the flow of the combustion gas in the cover body A.

The latent heat exchanger according to the second invention according to the above object, together with the sensible heat exchanger, uses hot water in a hot water supply circuit that supplies hot water to a hot water outlet and hot water in a reheating circuit in which hot water in a bathtub circulates. In a latent heat exchanger heated by combustion gas, a pipe that is formed with an intake port for taking in the combustion gas that has passed through the sensible heat exchanger and an discharge port for the combustion gas, and is a part of the hot water supply circuit. E and a cover body in which the tube F which is a part of the reheating circuit is arranged inside are provided, and the tube F is arranged on the downstream side of the tube E along the flow of the combustion gas in the cover body. ing.

In the latent heat exchanger according to the second invention, it is preferable that the in-tube volume of the tube E is larger than the in-tube volume of the tube F.

The hot water supply device according to the first invention and the latent heat exchanger according to the second invention are a part of a tube E which is a part of a hot water supply circuit and a part of a reheating circuit in a cover body B (cover body). Since the pipe F is arranged and the pipe F is arranged on the downstream side of the pipe E along the flow of the combustion gas in the cover body B, the combustion gas flowing into the cover body B uses the hot water in the pipe E. After the temperature drops due to heating, the hot water in the pipe F is heated, and the temperature rise of the hot water in the pipe F can be suppressed. As a result, the hot water flowing into the bath during the reheating operation exceeds the predetermined temperature. It is possible not to.

It is explanatory drawing of the hot water supply apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the relationship between the hot water supply device, a reheating circuit and a hot water supply circuit. It is a partially omitted plan sectional view of the latent heat exchanger which concerns on one Embodiment of this invention. It is a partially omitted vertical sectional view of the latent heat exchanger.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
As shown in FIGS. 1 and 2, the hot water supply device 10 according to the embodiment of the present invention is a heat exchanger 13 having a burner unit 11 for generating combustion gas and a cover body 12 (cover body A). And the latent heat exchanger 15 having the cover body 14 (cover body B), and the hot water (hot water or water) of the hot water supply circuit 16 for supplying hot water to the hot water outlet and the hot water in the bathtub 17 circulate. It is a device that heats the hot water of the heating circuit 18 with the combustion gas. Hereinafter, it will be described in detail.

As shown in FIG. 1, the burner unit 11 includes a housing 20 to which a blower fan 19 is attached on the lower side and a burner portion 21 provided in the housing 20. The entire upper side of the housing 20 is open, and combustible fuel is supplied to the burner portion 21 from a supply pipe (not shown). The burner unit 21 can burn combustible fuel to generate combustion gas in the housing 20. Note that the description of the blower fan 19 is omitted in FIG.

The sensible heat exchanger 13 has a cylindrical cover body 12 whose upper and lower sides are open, and the lower open region of the cover body 12 communicates with the upper open region of the housing 20. In the cover body 12, a pipe 22 (pipe C) which is a part of the hot water supply circuit 16 and a pipe 23 (tube D) which is a part of the reheating circuit 18 are arranged. The pipe 22 has a first region 24 and a second region 25 arranged along the flow of hot water in the hot water supply circuit 16, and the first region 24 is arranged below the second region 25. The tube 23 is arranged between the first region 24 and the second region 25.

The latent heat exchanger 15 includes a box-shaped cover body 14 arranged above the cover body 12. As shown in FIGS. 1 and 3, the cover body 14 is formed with a gas discharge port 27 that is long in the left-right direction on the side wall portion 26 on the front side, and is long in the left-right direction on the rear side of the bottom portion 28 of the cover body 14. The gas intake port 29 is formed. In the cover body 14, as shown in FIGS. 3 and 4, a plurality of pipes 30 (tubes E) that are a part of the hot water supply circuit 16 and a plurality of pipes 31 (tubes) that are a part of the reheating circuit 18 F) is arranged. In the present embodiment, there is no member in the cover body 14 that divides the space provided with the plurality of pipes 30 and the space provided with the plurality of pipes 31, and the plurality of pipes 30 and the plurality of pipes 31 are the same space. It is provided inside.

As shown in FIGS. 1 to 4, the reheating circuit 18 includes a bath return pipe 32 in which the hot water in the bathtub 17 is returned from the bathtub 17, an internal hollow header 33 connected to the bath return pipe 32, and a header. A plurality of pipes 31 connected in parallel to 33 via a connecting pipe 33a, an internal hollow header 34 in which a plurality of pipes 31 are connected in parallel via a connecting pipe 34a, and a connecting pipe 35 to the header 34. It has a connected pipe 23 and a bath out pipe 36 that sends hot water that has passed through the pipe 23 to the bathtub 17.

As shown in FIGS. 3 and 4, the plurality of pipes 31 have a wound shape, respectively, and are arranged in the vertical direction on the front side in the cover body 14. As shown in FIGS. 1 and 2, the cover body 14 has a side wall portion 38 on the left side and a side wall portion 39 facing the side wall portion 38 on the right side, and the side wall portion 39 faces the inside of the cover body 14, respectively. A plurality of protrusions 40 are formed. In each pipe 31, the folded portion provided on the right side is positioned in contact with the plurality of protrusions 40, and both ends provided on the left side are brazed to the side wall portion 38.

The headers 33 and 34 are long in the vertical direction, respectively, and the connecting pipes 33a are connected to the header 33 at equal pitches, and the connecting pipes 34a are connected to the header 34 at equal pitches. The plurality of connecting pipes 33a and the plurality of connecting pipes 34a are respectively arranged outside the cover body 14, each connecting pipe 33a is connected in series to one end of the pipe 31, and each connecting pipe 34a is connected in series to the other end of the pipe 31. There is.

As shown in FIGS. 1 to 4, the hot water supply circuit 16 has a water supply pipe 43 connected to the water pipe 42, an internal hollow header 44 connected to the water supply pipe 43, and a connecting pipe 44a to the header 44. A plurality of pipes 30 connected in parallel via the connecting pipes 30, an internal hollow header 45 in which the plurality of pipes 30 are connected in parallel via the connecting pipe 45a, and a pipe 22 connected to the header 45 via the connecting pipe 46. It has a hot water supply pipe 47 that sends the hot water sent out from the pipe 22 to the hot water outlet.

Each of the plurality of pipes 30 has a wound shape, and is arranged behind the plurality of pipes 31 in the cover body 14. Each pipe 30 is positioned by a member (not shown), and both ends are brazed to the side wall portion 39. The plurality of connecting pipes 44a and 45a are arranged outside the cover body 14, each connecting pipe 44a is connected in parallel to one end of the pipe 30, and each connecting pipe 45a is connected in parallel to the other end of the pipe 30.

The headers 44 and 45 are long in the front-rear direction, respectively, and the connecting pipes 44a are connected to the header 44 at equal pitches, and the connecting pipes 45a are connected to the header 45 at equal pitches.
In addition, in FIGS. 1 and 2, the description of the headers 33, 34, 44, 45 and the connecting pipes 33a, 34a, 44a, 45a is omitted.

When combustion gas is generated in the housing 20 due to the combustion of the combustible fuel by the burner portion 21, the combustion gas flows from the housing 20 into the cover body 12 and rises in the cover body 12 to blow hot water in the pipes 22 and 23. It is heated and flows into the cover body 14 from the gas intake port 29 formed on the rear side of the bottom 28 of the cover body 14. Then, the combustion gas moves forward in the cover body 14, heats the hot water in each pipe 30, heats the water in each pipe 31, and is discharged to the outside of the cover body 14 from the gas discharge port 27. To.

Therefore, the latent heat exchanger 15 according to the embodiment of the present invention heats the hot water in the hot water supply circuit 16 and the hot water in the reheating circuit 18 with the combustion gas together with the sensible heat exchanger 13. A pipe 30 which is formed with a gas intake port 29 (intake port) for taking in combustion gas that has passed through the sensible heat exchanger 13 and a gas discharge port 27 which is a combustion gas discharge port, and is a part of the hot water supply circuit 16. And the cover body 14 in which the pipe 31 which is a part of the reheating circuit 18 is arranged inside is provided, and the pipe 31 is arranged on the downstream side of the pipe 31 along the flow of the combustion gas in the cover body 14. ..

The first region 24 of the pipe 22, the pipe 23, and the second region 25 of the pipe 22 are sequentially along the flow of the combustion gas in the cover body 12 (that is, the pipe 23 is along the flow of the combustion gas in the cover body 12). Since it is arranged (on the downstream side of a part of the pipe 22), the combustion gas flowing into the cover body 12 heats the hot water in the first region 24 to lower the temperature, and then the inside of the pipe 23. Heat the hot water. Since the plurality of pipes 31 are arranged on the downstream side of the plurality of pipes 30 along the flow of the combustion gas in the cover body 14, the combustion gas flowing into the cover body 14 is a plurality of pipes. After heating the water in 30 to lower the temperature, the hot water in the plurality of pipes 31 is heated.

When heating the hot water flowing in the hot water supply circuit 16 toward the hot water outlet, the burner unit 21 burns the combustible fuel regardless of whether or not the hot water in the bathtub 17 circulates in the reheating circuit 18. Will be done. Therefore, when the combustible fuel is burned by the burner portion 21 in a state where the hot water in the bathtub 17 is not circulated in the reheating circuit 18, the hot water staying in the pipe 23 and staying in each pipe 31. The hot water is heated by the combustion gas. By starting the reheating operation of the hot water in the bathtub 17 in this state, the hot water remaining in each pipe 23 is sent to the bathtub 17, and the hot water heated in each pipe 31 passes through the pipe 23. Then, after being further heated, it is sent to the bathtub 17.

Here, in the present embodiment, since the pipe 23 is arranged on the downstream side of the first region 24 along the flow of the combustion gas in the cover body 12, it is heated in the pipe 23 at the start of the reheating operation. The hot water that has been used does not flow into the bathtub 17 at a temperature higher than a predetermined temperature of M ° C. (for example, 60 ° C.). Since the plurality of pipes 31 are arranged on the downstream side of the plurality of pipes 30 along the flow of the combustion gas in the cover body 14, they are heated in the plurality of pipes 31 at the start of the reheating operation. The hot water does not flow into the bathtub 17 at a temperature higher than M ° C. Therefore, the hot water supply device 10 can prevent the hot water flowing into the bathtub 17 from exceeding M ° C. during the reheating operation.

Moreover, in the present embodiment, the total in-pipe volume of each of the plurality of pipes 30 (total in-tube volume of the plurality of pipes 30) is larger than the total in-tube volume of each of the plurality of pipes 31 (total in-pipe volume of the plurality of pipes 31). This point contributes to the fact that the hot water heated in the plurality of pipes 31 at the start of the reheating does not flow into the bath 17 at a temperature higher than M ° C. Further, in the present embodiment, the fact that the pipe 23 is arranged on the downstream side of the first region 24 along the flow of the combustion gas in the cover body 12 means that the pipe 23 is heated in the plurality of pipes 23 at the start of reheating. It is suitable that the hot water that has been used does not flow into the bathtub 17 at a temperature higher than M ° C.

Further, as shown in FIG. 4, the latent heat exchanger 15 is provided with a raised bottom 49 at the bottom 28 of the cover body 14, and the gas intake port 29 is formed at the raised bottom 49. The raised bottom 49 is provided with a guide member 50 for flowing drain water forward below the plurality of pipes 30, and a drain portion for discharging drain water to the outside of the cover body 14 in front of the bottom 28 of the cover body 14. 51 is formed.

The guide member 50 is provided with a plurality of protrusions 52, each of which projects downward and is in contact with the raised bottom 49. Only the protrusion 52 of the guide member 50 is in contact with the bottom portion 28, and prevents heat from being transferred from the guide member 50 to the bottom portion 28. The dew condensation formed on the surface of the tube 30 becomes water droplets of drain water in a high temperature state and falls on the guide member 50. In the present embodiment, the protrusion 52 prevents heat transferred from the guide member 50 to the bottom 28, thereby suppressing dew condensation on the bottom 28.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not deviate from the gist are within the scope of the present invention.
For example, the in-tube volume of the tube E may be less than or equal to the in-tube volume of the tube F.
Further, the pipe F may be arranged on the downstream side of the pipe E along the flow of the combustion gas in the cover body B, and the pipe F does not need to be arranged on the front side of the pipe E.
Then, the pipe D may be arranged on the downstream side of the entire pipe C along the flow of the combustion gas in the cover body A, or the pipe D may be arranged on the downstream side of the entire pipe C along the flow of the combustion gas in the cover body A. It may be arranged on the upstream side.

10: Hot water supply device, 11: Burner unit, 12: Cover body, 13: Magnificent heat exchanger, 14: Cover body, 15: Submarine heat exchanger, 16: Hot water supply circuit, 17: Bathtub, 18: Reheating circuit , 19: blower fan, 20: housing, 21: burner part, 22, 23: pipe, 24: first area, 25: second area, 26: side wall part, 27: gas outlet, 28: bottom part, 29: Gas intake port, 30, 31: pipe, 32: bath return pipe, 33: header, 33a: connecting pipe, 34: header, 34a: connecting pipe, 35: connecting pipe, 36: bath outbound pipe, 38, 39: side wall Part, 40: protrusion, 42: water pipe, 43: water supply pipe, 44: header, 44a: connecting pipe, 45: header, 45a: connecting pipe, 46: connecting pipe, 47: hot water supply pipe, 49: raised bottom, 50: Guide member, 51: drainage part, 52: protrusion

Claims (5)

A burner unit that generates combustion gas, a latent heat exchanger having a cover body A, and a latent heat exchanger having a cover body B are provided, and hot water in a hot water supply circuit that supplies hot water to a hot water outlet and in a bathtub. In the hot water supply device that heats the hot water in the reheating circuit where the hot water circulates with the combustion gas.
A pipe C which is a part of the hot water supply circuit and a pipe D which is a part of the reheating circuit are arranged in the cover body A, and a part of the hot water supply circuit is arranged in the cover body B. The pipe E and the pipe F which is a part of the reheating circuit are arranged, and the pipe F is arranged on the downstream side of the pipe E along the flow of the combustion gas in the cover body B. A hot water supply device characterized by that. The hot water supply device according to claim 1, wherein the volume inside the pipe E is larger than the volume inside the pipe F. In the hot water supply device according to claim 1 or 2, the pipe D is arranged on the downstream side of a part or the whole of the pipe C along the flow of the combustion gas in the cover body A. Hot water supply device. In the latent heat exchanger that heats the hot water in the reheating circuit where the hot water in the hot water supply circuit that supplies hot water to the hot water outlet and the hot water in the bathtub circulates with the combustion gas together with the sensible heat exchanger.
An intake port for taking in the combustion gas that has passed through the latent heat exchanger and an exhaust port for the combustion gas are formed, and are a part of a pipe E that is a part of the hot water supply circuit and a part of the reheating circuit. A latent heat exchanger comprising a cover body in which the tube F is arranged inside, and the tube F is arranged on the downstream side of the tube E along the flow of the combustion gas in the cover body. .. The latent heat exchanger according to claim 4, wherein the volume inside the tube E is larger than the volume inside the tube F.

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