JP2016183812A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device capable of improving hot water supply characteristic by suppressing phenomenon that hot water of high temperature is supplied in starting general hot water supply after executing bath hot water supply or air-heating hot water supply.SOLUTION: A hot water supply device WH includes a burner 1 and a heat exchanger HE, the heat exchanger HE has a first heat transfer pipe T1 for general hot water supply, and a second heat transfer pipe T2 for bath hot water supply or air-heating hot water supply accommodated in one case 4 while shifted in a vertical height direction. In a burner 1, a plurality of combustible regions 10a are arranged in an x direction, and a region at a first end portion 4a side in the x direction of the case is applied as a combustion region Aa, and a region at a second end portion 4b side in the x direction is applied as a non-combustion region Ab, when the bath hot water supply or the air-heating hot water supply is executed in a state of stopping the general hot water supply. A hot water tapping port 63a of the first heat transfer pipe T1 is disposed at the second end portion 4b side in the x direction of the case 4.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hot water supply apparatus of a type provided with a so-called one-can two-water channel type heat exchanger.

As a specific example of the hot water supply device, a first heat transfer tube for performing hot water heating for general hot water supply and hot water for bath hot water heating are performed in a case in which combustion gas generated by a burner flows into the case. There is one using a heat exchanger in which two types of heat transfer tubes are accommodated. The first and second heat transfer tubes are provided in a so-called vertical arrangement that is displaced in the vertical thickness direction of the case (see Patent Documents 1 to 3).
According to such a structure, compared with what provided the 1st and 2nd heat exchanger tube side by side, the width | variety of the whole heat exchanger can be made small, and the slimming of the whole hot-water supply apparatus can be achieved.

  However, the prior art has room for improvement as described below.

That is, when performing hot water supply while the general hot water supply is stopped, the combustion gas acts not only on the second heat transfer pipe for bath hot water supply, but also on the first heat transfer pipe for general hot water supply. The hot water in the heat transfer tube is also heated to a high temperature. For this reason, when the general hot water supply is started relatively early after the bath hot water supply is finished, the hot water heated to a high temperature during the hot water supply described above may result in poor hot water discharge characteristics. is there.
Conventionally, there is a tube in which the second heat transfer tube is not for bath hot water supply but for heating hot water supply, but in this case, the same problem as described above occurs.

JP 09-145162 A JP-A-10-267414 JP 2001-201179 A

  The present invention has been conceived under the circumstances as described above, and suppresses a phenomenon in which hot hot water is discharged when general hot water supply is started after performing bath hot water supply or heating hot water supply. An object of the present invention is to provide a hot water supply device capable of improving the characteristics.

  In order to solve the above problems, the present invention takes the following technical means.

A hot water supply device provided by the present invention is for performing hot water heating by performing heat recovery from a burner having a plurality of combustible regions that can be individually driven to burn, and combustion gas generated by the burner. And a heat exchanger. The heat exchanger includes a case for allowing the combustion gas to flow in and passing in the vertical height direction, a first heat transfer pipe disposed in the case and for heating hot water for general hot water supply, A second heat transfer pipe disposed in the case so as to be displaced in the vertical direction from the first heat transfer pipe, and for performing hot water heating for bath hot water supply or heating hot water supply; ing. As the width direction of the case, there are an x direction and a y direction intersecting with each other, and each of the first and second heat transfer tubes has a plurality of straight tube portions extending in the x direction arranged in the y direction, and It is configured as a finned heat transfer tube that is connected in series via a plurality of curved tube sections, one end of which is a water inlet, and the other end is a hot water outlet. In the burner, when the hot water supply or the hot water supply is performed in a state where the plurality of combustible regions are arranged in the x direction and the general hot water supply is stopped, the region on the first end side in the x direction of the case is the combustion region. The x-direction second end side region opposite to this is configured as a non-combustion region, and the outlet of the first heat transfer tube is located on the x-direction second end side of the case. Is provided.

According to the configuration of the present invention, the following effects can be obtained.
That is, when the hot water supply or the hot water supply is performed in a state where the general hot water supply is stopped, the first heat transfer tube for the general hot water supply is also heated, but in this case, the first end side of the case in the x direction This region is heated intensively, and the degree of heating of the region on the second end side in the x direction is low. When the above-described bath water supply or heating hot water supply is completed and general hot water supply is started, and hot water is discharged from the outlet of the first heat transfer tube, the second end of the case in the x direction in the first heat transfer tube. The hot water having a low degree of heating that has been present on the side of the section is discharged first. After that, the hot water existing on the first end side in the x direction is discharged, but it takes a certain distance and time for this hot water to reach the hot water outlet. Is possible. For this reason, hot water heated to a high temperature at the time of bath hot water supply or heating hot water supply suppresses the phenomenon of hot water coming out from the hot water outlet immediately after the start of general hot water supply, and improves the hot water discharge characteristics as compared with the prior art. be able to.

  In the present invention, preferably, the outlet of the second heat transfer tube is provided on the first end side in the x direction of the case.

  According to such a configuration, when bath hot water supply or heating hot water supply is performed, the region on the first end portion side in the x direction of the case in the second heat transfer tube is intensively heated. The heated hot water will immediately reach the outlet of the second heat transfer tube. Therefore, there is an advantage that hot water heated to a predetermined high temperature can be discharged quickly at the time of bath hot water supply or heating hot water supply.

  In the present invention, preferably, of the first and second heat transfer tubes, one water inlet is provided on one end side in the y direction of the case, and the other water inlet is in the y direction of the case. It is provided on the end side.

  According to such a configuration, it is possible to prevent a large amount of condensed water from being generated in the heat exchanger. That is, in the case where the incoming water temperature to the first and second heat transfer tubes is low, water vapor in the combustion gas that has contacted the first and second heat transfer tubes and fins is condensed and condensed in the heat exchanger. There is a risk of water generation. Since the generation of such condensed water is strongly acidic, it is not preferable from the viewpoint of protecting the heat exchanger. On the other hand, the condensed water is likely to be generated in the vicinity of the water inlet that is the lowest temperature portion of the first and second heat transfer tubes. On the other hand, according to the said structure, since the water inlet of both the 1st and 2nd heat exchanger tubes is set as the arrangement | positioning largely separated in the y direction, the water inlet of the 1st and 2nd heat exchanger tubes It is possible to suppress the generation of condensed water by preventing the temperature in the vicinity from becoming too low. Unlike the above configuration, when the water inlets of both the first and second heat transfer tubes are close to each other, the temperature in the vicinity of the water inlets of both the first and second heat transfer tubes is lowered and the condensed water is generated. Although it becomes easy to generate | occur | produce, according to the said structure, such a thing can be suppressed appropriately.

In the present invention, the first heat transfer tube has two sets of serpentine tube portions in plan view in which the plurality of straight tube portions are connected in series via the plurality of bent tube portions. These two sets of tube portions are provided in two upper and lower stages, and one end portions thereof are connected to each other, and the second heat transfer tube includes the plurality of straight tube portions. There is only one set of planarly meandering tube portions connected in series via the plurality of curved tube portions, and the one set of tube portions is between the two sets of tube portions. The fins have a plate-like shape extending in the y direction, and a plurality of fins arranged at intervals in the x direction are provided. Each of the first and second heat transfer tubes can have a straight tube portion that is penetrated and joined.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is principal part sectional drawing which shows an example of the hot water supply apparatus which concerns on this invention. (A) is a principal part plane sectional view which shows the planar view shape of the 1st heat exchanger tube in the hot water supply apparatus of FIG. 1, (b) is the planar view shape of the 2nd heat exchanger tube in the hot water supply apparatus of FIG. FIG. It is a principal part plane sectional view which shows typically the burner in the hot water supply apparatus of FIG. (A), (b) is principal part plane sectional drawing which shows an effect | action of the hot-water supply apparatus shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  A hot water supply WH shown in FIG. 1 includes a burner 1 that generates combustion gas, a burner case 2 that houses the burner 1, a fan 3 that sends combustion air into the burner case 2, and combustion gas generated by the burner 1. A heat exchanger HE for recovering heat from the water and heating with hot water is provided. The heat exchanger HE is for sensible heat recovery. Although omitted in the drawings, preferably, another heat exchanger (secondary heat exchanger) is provided on the heat exchanger HE, and latent heat is generated from the combustion gas after passing through the heat exchanger HE. It is configured to collect. Of course, instead of such a configuration, a collecting cylinder into which the combustion gas that has passed through the heat exchanger HE flows is provided above the heat exchanger HE, and the combustion gas is discharged from the exhaust port of the collecting cylinder to the outside. It can also be a heat recovery type (non-latent heat recovery type).

The heat exchanger HE is a so-called one-can two-water system, a rectangular frame-like case 4 (can body) placed on the upper part of the burner case 2, and the first and second arranged in the case 4. Heat transfer tubes T1 and T2 and a plurality of plate-like fins 5 are provided. Each of these parts is made of copper, for example.
The x direction and the y direction in the drawings are the width direction (lateral width direction or front-rear width direction) of the case 4 and intersect each other. 2 to 4, the x direction left end of the case 4 is the x direction first end 4a, and the x direction right end is the x direction second end 4b.

The first heat transfer tube T1 is for general hot water supply to a hot water supply destination such as a kitchen or a washroom. The second heat transfer tube T2 is for bath hot water supply. As shown in FIG. 2A, in the first heat transfer tube T1, a plurality of straight tube portions 60a extending in the x direction are connected in series via a plurality of semicircular arc-shaped bent tube portions 61a. Two sets of the meandering pipe body portions 6 in plan view are provided, and these two sets of pipe body portions 6 are provided in two upper and lower stages and connected to each other. Of the first heat transfer tube T1, one end opening portions of the lower and upper two straight tubular body portions 6 positioned at one end portion in the y direction are a water inlet 62a and a hot water outlet 63a, respectively. The water inlet 62 a and the hot water outlet 63 a are disposed on the x-direction second end 4 b side of the case 4. The first heat transfer pipe T1 is configured such that the hot water supplied to the water inlet 62a flows through the lower pipe body section 6 and then flows into the upper pipe body section 6 and is discharged from the hot water outlet 63a. . Connected to the water inlet 62a and the hot water outlet 63a are a water inlet pipe 70a for supplying hot water to the water inlet 62a and a hot water outlet pipe 71a for sending hot water discharged from the hot water outlet 63a to the hot water supply destination. A temperature sensor Sa for detecting a hot water temperature is provided in a portion near the hot water outlet 63a in the straight tube body 60a to which the incoming water pipe 70a or the hot water pipe 71a is connected.

  As shown in FIG. 2B, in the second heat transfer tube T2, a plurality of straight tubular body portions 60b extending in the x direction are connected in series via a plurality of semicircular arc-shaped curved tubular body portions 61b. It is the structure which has only one set of the planar-view serpentine tube part made. The second heat transfer tube T2 is a single stage in the vertical direction, and is disposed between the upper and lower two-stage tube portions 6 of the first heat transfer pipe T1. Of the second heat transfer tube T2, one end opening portions of the two straight tube portions 60b located at both ends in the y direction are a water inlet 62b and a hot water outlet 63b. The water inlet 62b is located on the x-direction second end 4b side of the case 4, while the hot water outlet 63b is located on the x-direction first end 4a side. The hot water that has entered from the water inlet 62b flows through the second heat transfer pipe T2 as it is and reaches the hot water outlet 63b. A water inlet pipe 70b and a hot water outlet pipe 71b are connected to the water inlet 62b and the hot water outlet 63b, and a portion close to the hot water outlet 63b in the hot water pipe 71b or the straight tubular body portion 60b to which the hot water outlet pipe 71b is connected. Is provided with a temperature sensor Sb for detecting a tapping temperature.

  The plurality of fins 5 have a plate shape extending in the y direction, and are arranged at intervals in the x direction. The straight tube portions 60 a and 60 b of the first and second heat transfer tubes T <b> 1 and T <b> 2 are penetrated and joined to the plurality of fins 5. Each fin 5 is appropriately provided with a plurality of convex portions 50 for increasing the degree of contact with the combustion gas and increasing the amount of heat recovery using the fin 5 (see FIG. 1).

  The burner 1 is, for example, a gas burner that burns fuel gas, and as shown in FIG. 3, a plurality of burner bodies 10 (combustion pipes) are arranged in the x direction. As the burner body 10, for example, a well-known one described in JP2013-242080A is used, and details thereof are omitted, but the flame hole surface of the burner body 10 has a configuration extending in the y direction. Have. Each flame surface of the plurality of burner bodies 10 corresponds to a combustible region 10a that can be individually driven to burn. The thermal power of the burner 1 can be changed to, for example, four stages of first thermal power to fourth thermal power. In the first thermal power, only the two combustible regions 10a closer to the center are combustion regions, and in the second thermal power, the case Only the three combustible regions 10a on the x-direction first end portion 4a side (regions with a halftone dot pattern in FIG. 4) are the combustion regions. In the third thermal power, only the five combustible regions 10a on the x-direction first end portion 4a side are the combustion regions, and in the fourth thermal power, all (for example, eight) combustible regions 10a are the combustion regions. In the state where the general hot water supply is stopped, when only bath hot water is executed, the burner 1 is driven and burned in the above-described second and third thermal power modes, and the case of the plurality of combustible regions 10a 4 is provided with a non-combustion region on the x-direction second end 4b side.

  Next, the operation of the hot water heater WH will be described.

First, when the hot water supply is performed in a state where the general hot water supply is stopped, not only the second heat transfer tube T2 for bath hot water supply but also the first heat transfer tube T1 for general hot water supply is heated. In this case, as shown in FIG. 4, the burner 1 has an area on the first end 4a side in the x direction of the case 4 as the combustion area Aa. Therefore, the burner 1 is located above the combustion area Aa in the first heat transfer tube T1. The portion is heated intensively, and the heating degree of the upper portion of the non-combustion region Ab on the x-direction second end portion 4b side is low. For this reason, when the bath hot water supply is finished and the general hot water supply is started thereafter, hot hot water can be prevented from immediately coming out from the hot water outlet 63a of the first heat transfer tube T1. From the hot water outlet 63a, hot water having a low heating level existing in the region (the region indicated by A2) on the second end 4b side in the x direction in the first heat transfer tube T1 is discharged first. Next, the hot water existing in the region on the x-direction first end portion 4a side (the region indicated by reference numeral A1) is discharged, but it takes a certain distance and time until the hot water reaches the outlet 63a. Thus, an effect of alleviating the high temperature state of the hot water is obtained. As a result, the hot water heated to a high temperature at the time of bath hot water supply can suppress the phenomenon of hot water coming out from the hot water outlet 63a at a high temperature immediately after the start of the general hot water supply, thereby improving the hot water discharge characteristics.

  On the other hand, in FIG.4 (b), the hot water outlet 63b of the 2nd heat exchanger tube T2 is provided in the x direction 1st end part 4a side, and exists in the position close | similar to the combustion area | region Aa of the burner 1 at the time of bath hot water supply doing. For this reason, when bath hot water supply is started, the hot water heated by the burner 1 immediately reaches the hot water outlet 63b, and the hot water heated to a predetermined temperature can be discharged quickly. Therefore, it is possible to appropriately perform bath hot water temperature control based on the hot water temperature detected using the temperature sensor Sb.

  The water inlets 62a and 62b of the first and second heat transfer tubes T1 and T2 are arranged at both ends in the y direction of the case 4 and are separated with large dimensions, so that a large amount of condensed water is contained in the heat exchanger HE. Generation | occurrence | production is also prevented suitably. More specifically, when the incoming water temperature to the heat exchanger HE is low, water vapor in the combustion gas supplied to the heat exchanger HE is condensed, and the lowest temperature among the heat exchangers HE is input. There is a possibility that strongly acidic condensed water may be generated in the vicinity of the water ports 62a and 62b. Such strongly acidic condensate causes corrosion of the heat exchanger HE and also causes clogging between the fins 5, so that it is desired to prevent it from occurring as much as possible. On the other hand, in the present embodiment, since the two water inlets 62a and 62b are arranged so as to be largely separated in the y direction, even if relatively low temperature hot water is supplied to the heat exchanger HE, Is distributed and supplied at positions where the distance of the heat exchanger HE is separated, and it is possible to prevent a region having a low temperature from occurring in a large area. Unlike the present embodiment, when the two water inlets 62a and 62b are arranged close to each other, a region having a low temperature is generated in a large area in the vicinity of the two water inlets 62a and 62b. . In this embodiment, such an advantage can be eliminated and the advantage that generation of condensed water in the heat exchanger HE can be suppressed can be obtained.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the hot water supply apparatus according to the present invention can be variously modified within the intended scope of the present invention.

The second heat transfer tube can be used for heating hot water supply instead of bath hot water supply.
The specific arrangement of the first and second heat transfer tubes (such as the number of tubes in the vertical direction) may be different from the above-described embodiment. The burner should just have a several combustible area | region, and the specific number is not limited. Moreover, at the time of bath hot water supply or heating hot water supply, the area | region of the x direction 1st edge part side of the case of a heat exchanger should just be made into a combustion area, The specific size or area ratio etc. are not limited. As the burner, for example, an oil burner can be used instead of the gas burner. Further, as the burner, a plate-like one can be adopted instead of a plurality of flat burner bodies arranged side by side.

WH Water heater T1, T2 First and second heat transfer tubes HE Heat exchanger 1 Burner 10a Combustible region 4 Case 4a Case x-direction first end 4b Case x-direction second step portion 5 Fin 6 Tube portion (Of the first heat transfer tube)
60a, 60b Straight pipe parts 61a, 61b Curved pipe parts 62a, 62b Water inlets 63a, 63b Hot water outlets

Claims (4)

A burner having a plurality of combustible regions that can be individually driven to burn, and a heat exchanger for performing hot water heating by recovering heat from the combustion gas generated by the burner,
The heat exchanger is
A case in which the combustion gas flows into the interior and passes in the vertical direction;
A first heat transfer tube arranged in the case and for performing hot water heating for general hot water supply;
A second heat transfer pipe disposed in the case so as to be displaced in the vertical height direction from the first heat transfer pipe, and for performing hot water heating for bath hot water supply or heating hot water supply;
With
As the width direction of the case, there are an x direction and a y direction intersecting each other,
Each of the first and second heat transfer tubes has a plurality of straight tube portions extending in the x direction arranged in the y direction and connected in series via the plurality of bent tube portions, It is a hot water supply device configured as a heat transfer tube with fins, one end side being a water inlet and the other end being a hot water outlet,
In the burner, when the hot water supply or the hot water supply is performed in a state where the plurality of combustible regions are arranged in the x direction and the general hot water supply is stopped, the region on the first end side in the x direction of the case is the combustion region. The x-direction second end side region opposite to this is configured as a non-combustion region,
The hot water supply apparatus according to claim 1, wherein a hot water outlet of the first heat transfer pipe is provided on the second end side in the x direction of the case. The hot water supply device according to claim 1,
The hot water supply apparatus, wherein the outlet of the second heat transfer tube is provided on the first end side in the x direction of the case. The hot water supply device according to claim 1 or 2,
Of the first and second heat transfer tubes, one water inlet is provided on one end side in the y direction of the case, and the other water inlet is provided on the other end side in the y direction of the case. There is a water heater. A hot water supply apparatus according to any one of claims 1 to 3,
The first heat transfer tube has two sets of meandering tube body portions in plan view in which the plurality of straight tube body portions are connected in series via the plurality of curved tube body portions. A set of tube parts is provided in two upper and lower stages, and one end part thereof is connected to each other.
The second heat transfer tube has only one set of meandering tube portions in plan view in which the plurality of straight tube portions are connected in series via the plurality of curved tube portions, and One set of tube parts has a configuration provided between the two sets of tube parts,
As the fins, a plurality of fins having a plate-like shape extending in the y direction and arranged at intervals in the x direction are provided, and the plurality of fins are provided with the first and second heat transfer tubes. A hot water supply apparatus in which the respective straight tubular body portions are penetrated and joined.

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