JP2008039194A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which it is difficult to reduce the dimension and weight of a combustion device because conventionally a latent heat recovery heat exchanger improved in its heat transfer performance cannot be achieved. <P>SOLUTION: This combustion device is provided with a main heat exchanging device 19 heated by a burner 12 and mainly absorbing a sensible heat part and a sub-heat exchanging device 20 mainly absorbing a latent heat part, water pipes 35 penetrating through a plurality of fin portions 22 constituting the sub-heat exchanging device 20 are arranged in a reticular pattern at least in upper and lower two stages, and a turn-back portion 37 and a cut portion 36 are formed between the water pipes 35, thus the water pipes 35 can be efficiently arranged, heat transfer performance can be improved, and the compact combustion device of high efficiency can be provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an arrangement configuration of fins and water pipes of a latent heat recovery heat exchanger of a combustion apparatus having at least one of hot water supply, heating, and bath reheating functions.

A combustion apparatus equipped with a conventional latent heat recovery heat exchanger directly heats hot water and a bath with combustion gas, and the hot water can be recovered up to latent heat with a fin tube type latent heat recovery heat exchanger (see, for example, Patent Document 1). FIG. 4 shows a conventional combustion apparatus described in the publication. As shown in FIG. 4, a water supply pipe 1, a hot water pipe 2, a combustion burner 4, and a first heat exchanger 5 and a second heat exchanger 6 that recover sensible heat of combustion gas generated by the combustion burner 4 are arranged. In the combustion apparatus in which the latent heat recovery heat exchanger 7 that recovers the latent heat of the combustion gas is disposed downstream of the heat exchangers 5 and 6, the latent heat recovery heat exchanger 7 is a water channel to the first heat exchanger 5. Are connected to each other, and water supplied from the outside is sequentially heated by the latent heat recovery heat exchanger 7 and the first heat exchanger 5 to supply hot water, and a bypass passage 3 is provided to bypass the water passage of the heat exchanger. It is configured. With this configuration, it is possible to heat the hot water supply and bath reheating with a single can.
JP-A-2005-207687

  However, in the conventional combustion apparatus disclosed in Patent Document 1, it is clear that the latent heat recovery heat exchanger is of a fin tube type, but no measures for improving the heat transfer performance are disclosed. A high-performance latent heat recovery heat exchanger cannot be realized.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a combustion apparatus that efficiently recovers the latent heat of combustion gas and is small and lightweight.

  In order to solve the conventional problems, a combustion apparatus of the present invention includes a burner, a main heat exchange device that is heated by the burner and mainly absorbs sensible heat, and a secondary heat exchange device that mainly absorbs latent heat. The water pipes penetrating a plurality of fin parts constituting the auxiliary heat exchange device are arranged in a lattice form in at least two stages, and a folded part and a cutout part are provided between the water pipes.

  As a result, the water pipes can be arranged efficiently even with the same water pipe pitch between the left and right, and a small and highly efficient latent heat recovery heat exchanger can be realized.

  In the combustion apparatus of the present invention, the auxiliary heat exchanger that mainly absorbs the latent heat is a finned tube heat exchanger, and the water pipes are arranged in a lattice shape so that the water pipes are maximally provided in a limited volume. A small and highly efficient combustion apparatus can be realized by providing a folded portion and a cutout portion between them.

  According to a first aspect of the present invention, there is provided a burner having a function of at least one of hot water supply, heating, and bath reheating, a main heat exchange device that is heated by the burner and mainly absorbs sensible heat, and a latent heat component. A sub heat exchange device that absorbs heat and a water pipe that penetrates a plurality of fin portions constituting the sub heat exchange device are configured in at least a two-stage lattice arrangement, and a compact and highly efficient combustion apparatus can be realized.

  In the second aspect of the invention, in particular, the water pipes penetrating the plurality of fin portions constituting the auxiliary heat exchange device of the first aspect of the invention are arranged in at least two upper and lower grids, and the upper and lower stages are passed in parallel. With the configuration, it is possible to reduce the water pressure loss and realize a compact and highly efficient combustion apparatus.

  The third invention is particularly configured by providing a folded portion between adjacent upper, lower, left and right water pipes that pass through the plurality of fin portions constituting the auxiliary heat exchange device of the first invention. By inducing combustion gas to the lower end and disturbing the flow, the heat transfer coefficient can be improved and a compact and highly efficient combustion apparatus can be realized.

  In the fourth aspect of the invention, in particular, a cutout portion is provided in a portion that does not contribute much to heat transfer that exists between adjacent upper, lower, left, and right water pipes that penetrate the plurality of fin portions constituting the auxiliary heat exchange device of the first aspect of the invention. Provided and configured, a lightweight, compact and highly efficient combustion device can be realized without substantially reducing thermal efficiency.

  The fifth aspect of the invention is particularly configured by providing a folded portion and a cutout portion between adjacent upper, lower, left and right water pipes that pass through the plurality of fin portions constituting the auxiliary heat exchange device of the first aspect of the invention. A lightweight, compact and highly efficient combustion apparatus can be realized without substantially reducing the above.

  The sixth aspect of the invention is particularly configured by providing a protrusion at the lower end of the fin directly below the lowermost water pipe that penetrates the plurality of fins constituting the auxiliary heat exchange device of the first aspect of the invention. Stable combustion characteristics can be realized because of dropping without cross-linking and increasing the exhaust resistance of the combustion gas.

  The seventh aspect of the invention is particularly configured by providing a folded portion between the left and right water pipes at the lowermost stage of the plurality of fin portions constituting the auxiliary heat exchange device of the first invention, and the folded portion of the lower water pipe By inducing combustion gas to the lower end and disturbing the flow, the heat transfer coefficient can be improved and a compact and highly efficient combustion apparatus can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the conventional example and each embodiment, parts having the same configuration and the same operation are denoted by the same reference numerals, and detailed description thereof is omitted. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a main heat exchanger and a sub heat exchanger according to Embodiment 1 of the present invention, FIG. 2 is an overall configuration diagram of the combustion apparatus, and FIG. 3 is a front view of fin portions of the sub heat exchanger. It is a side view.

1, 2, and 3, a combustion apparatus 10 includes a combustion fan 11 that sends combustion air, a burner 12, a gas proportional valve 13 that proportionally controls the flow rate of gas supplied to the burner 12, and combustion of the burner 12. The gas solenoid valve 14 for switching the number, the heat exchange device 16 through which the hot water supply circuit 15 heated at the top of the burner 12 passes, the hot water supply circuit 15 has a water supply portion 17 and a hot water discharge portion 18, and the heat exchange device 16 is mainly used. A plurality of main heat exchanging units 19 are formed by a main heat exchanging unit 19 that is a main heat exchanging device that absorbs sensible heat and an auxiliary heat exchanging unit 20 that is an auxiliary heat exchanging device that mainly absorbs latent heat. The hot water supply circuit 15 passes through the main fin 21, a plurality of sub fins 22, a hot water supply / heating indirect heat exchanger 24 that transfers heat of the hot water supply circuit 15 to the heating circuit 23, and heat of the hot water supply circuit 15 to the bath circuit 25. A hot water bath indirect heat exchanger 26 for transferring heat, A small pressure-resistant circulation pump 27 that circulates water in the hot water circuit 15, a heating DC pump 28 that is a heating pump that circulates water in the heating circuit 23, and a mixing valve that controls the flow rate of the bypass pipe 29 that bypasses the heat exchange device 16. 30, a bath pump 31 that is a bath pump that circulates hot water in the bath circuit 25, a control device 32 that controls the rotation speed of the pressure-resistant circulation pump 27 and the heating pump 28, and instructions for hot water supply, heating, bath operation, and set temperature A remote controller 33 is provided. Furthermore, strong acid dew condensation water is generated by collecting latent heat in the auxiliary heat exchange unit 20, but the dew condensation water is neutralized with calcium carbonate or the like provided in the neutralizer 34 and discharged to the outside as drain water. .

  At this time, the hot water supply circuit 15 is provided with sub-water pipes 35, which are water pipes penetrating the sub-fins 22 of the sub-heat exchange unit 20, arranged in a lattice pattern. Further, the sub fin 22 is provided with a cutout portion 36 substantially at the center of four adjacent sub-water pipes 35 provided in a lattice shape in the vicinity of the upper, lower, left and right sides, and a folding portion 37 is provided immediately above the cutout portion 36. Furthermore, a protrusion 38 is provided at the lower end of the sub fin 22 on the downstream side of the lower sub water pipe 35.

  About the combustion apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  Water flows into the combustion apparatus 10 from the water supply unit 17, passes through the hot water supply circuit 15, absorbs mainly the latent heat of the combustion heat at the auxiliary heat exchange unit 20, and then absorbs mainly the sensible heat at the main heat exchange unit 19. Hot water is discharged from the part 18. The combustion gas first passes through the main heat exchange unit 19, then passes through the sub heat exchange unit 20, and is discharged from the exhaust port 39. In the auxiliary heat exchanging unit 20, condensed water is generated on the surface of the auxiliary fin 22 mainly by absorbing the latent heat. The generated condensed water drops to the lower side of the sub fin 22 due to the influence of gravity and combustion gas passing through. Here, the auxiliary fins 22 are provided with the auxiliary water pipes 35 in a lattice pattern, but by making the auxiliary fins 22 in a lattice form, the auxiliary fins 22 can be arranged in the shortest distance on the side of the water pipe row, and thus can be made compact. In addition, by providing the cutout portion 36 at substantially the center of the adjacent four sub-water pipes 35 in the up, down, left, and right directions, a portion that hardly affects the heat absorption is cut out, so that the weight of the sub heat exchange portion 20 is reduced without lowering the thermal efficiency. I can do it. Further, by providing the folded portion 37 immediately above the cutout portion 36, it is possible to disturb the flow of the combustion gas and improve the heat transfer coefficient. Further, the combustion gas is supplied to the upper portion of the lower sub-water pipe 35 provided in a lattice shape. Therefore, thermal efficiency can be improved. Further, by providing the folded portion 37 between the left and right sub-water pipes 35 at the lowermost stage of the sub-fin 22, the combustion gas can be introduced to the lower side of the lower-side sub-water pipe 35, thereby improving the thermal efficiency. Is possible.

  Condensed water generated on the surface of the sub fin 22 is dripped to the lower stage side of the sub fin 22 due to the effect of gravity and combustion gas passing through, but it is easy for the condensed water to drip from the protrusion 38 provided at the lower end of the sub fin 22. Since the condensed water does not stay between the plurality of sub fins 22 and the exhaust resistance of the combustion gas does not increase, stable combustion characteristics can be realized.

  As described above, since the combustion apparatus according to the present invention can realize a compact heat source having at least one of hot water supply or heating or bath reheating functions, of course, a hot water heater in a general house, It can be installed even in places where apartments such as apartments and apartments are installed. Further, the present invention can be applied to an oil boiler using kerosene as a heat source as well as gas as a heat source.

Sectional drawing of the main heat exchanger and sub heat exchanger in Embodiment 1 of this invention Overall configuration diagram of combustion apparatus in same embodiment (A) Top view of sub fin of sub heat exchanger in same embodiment (b) Side view of same Heat exchanger configuration diagram of conventional combustion equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Combustion apparatus 12 Burner 19 Main heat exchange apparatus 20 Sub heat exchange apparatus 22 Fin part 35 Water pipe 36 Cutout part 37 Folding part 38 Protrusion part

Claims (7)

A burner in a combustion apparatus having at least one of hot water supply, heating, and bath reheating functions, a main heat exchange apparatus that is heated by the burner and mainly absorbs sensible heat, and a secondary heat exchange that mainly absorbs latent heat. The combustion apparatus which made the apparatus and the water pipe which penetrates the several fin part which comprises the said auxiliary heat exchange apparatus at least the grid | lattice-like arrangement | sequence of two steps. The combustion apparatus according to claim 1, wherein water pipes penetrating a plurality of fin portions constituting the auxiliary heat exchanger are arranged in at least two upper and lower grids, and the upper stage and the lower stage are passed in parallel. The combustion apparatus according to claim 1, wherein a folded portion is provided between left and right water pipes adjacent to each other between adjacent upper and lower water pipes penetrating a plurality of fin portions constituting the auxiliary heat exchange device. The combustion apparatus according to claim 1, wherein a cutout portion is provided in a portion that does not contribute much to heat transfer existing between the upper, lower, left, and right water pipes that pass through and are close to the plurality of fin portions constituting the auxiliary heat exchange device. The combustion apparatus according to claim 1, wherein a folded portion and a cutout portion are provided between upper, lower, left and right water pipes penetrating through a plurality of fin portions constituting the auxiliary heat exchange device. The combustion apparatus according to claim 1, wherein a protrusion is provided at a lower end of the fin directly below a lowermost water pipe that penetrates the plurality of fins constituting the auxiliary heat exchange device. The combustion apparatus according to claim 1, wherein a folded portion is provided between the left and right water pipes below the plurality of fin portions constituting the auxiliary heat exchange device.

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