JP2005156033A - Fin for heat exchanger of water heater, and heat exchanger for water heater provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fin for a heat exchanger of a water heater, and the heat exchanger for the water heater provided with the fin improving thermal efficiency by increasing the amount of heat transfer to the inside of heat transfer tubes on the lower stage side. <P>SOLUTION: This fin 11 for the heat exchanger is constituted to arrange a plurality of heat transfer tube insertion holes 21, 22 zigzag in two upper and lower stages and to provide both sides of the upper parts of the heat transfer tube insertion holes 21, 21, 21, 21 positioned on the lower stage side, with protrusions 41, 41 for guiding the flow of combustion gas rising from below, toward the upper face side of the heat transfer tubes inserted through the heat transfer tube insertion holes 21 on the lower stage side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchanger fin of a water heater and a heat exchanger for a water heater provided with the same.

As shown in FIG. 5, the water heater 6 is mainly composed of a heat exchanger 5, a combustion unit 62, a pipe (conduit) 52, and the like inside the heat exchanger 5 as shown in FIGS. 6 (a) and 6 (b). As shown, a plurality of heat exchanger fins 15 are arranged in alignment, and a plurality of heat transfer tubes 531 and 532 are inserted perpendicularly to the heat exchanger fins 15. Further, a burner 621 serving as a heat source is installed inside the combustion section 62 shown in FIG. 5, and water serving as a refrigerant is transferred from the pipe (conduit) 52 to the heat transfer tubes 531 and 532 in the heat exchanger 5 (FIG. ) And (b)), the water is heated by the combustion of the burner 621 and supplied as hot water.
The heat exchanger fin 15 is a plate fin type, and the heat exchanger 5 using this is referred to as a fin tube heat exchanger.

  FIG. 8 shows a conventional heat exchanger fin for a water heater, and the heat exchanger fin 15 has two upper and lower heat transfer tube insertion holes 21 and 22 for inserting the heat transfer tubes 531 and 532 shown in FIG. The lower heat transfer tube insertion holes 21 and the upper heat transfer tube insertion holes 22 are provided in a zigzag pattern, and the heat transfer tube insertion holes 21 and 21 on the lower side are adjacent to each other. A notch 33 is provided from the lower end of the exchanger fin 15 to the lower side of the upper heat transfer tube insertion hole 22.

On the other hand, as conventional heat exchanger fins, holes for inserting heat exchange water pipes (heat transfer tubes) are arranged in two stages in the same straight line in the vertical direction and constant in the same straight line in the horizontal direction. Arranged in multiple rows at intervals, with burring holes formed in the middle of the heat exchange water passage pipe insertion holes (see Patent Document 1) and water pipe (heat transfer pipe) insertion holes alternately above and below In addition, a burring is formed above the lower water pipe insertion hole and in the middle of the lower water pipe insertion hole and the adjacent upper water pipe insertion hole (see Patent Document 2). ing.
In the former, the rising hot air is diverted to the side by the resistance of the burring hole, and the heat absorption is promoted by hitting the upper-stage heat exchange pipe. The burring is sufficiently heated by this, and heat is uniformly transferred to the surrounding water pipe (heat transfer pipe) by heat conduction of the burring.
JP-A-6-109391 The full text of Japanese Utility Model Publication 3-93360

  In the square piping system as described in Patent Document 1 in which the heat transfer tubes provided in the heat exchanger fins are arranged at equal intervals in the vertical direction and the horizontal direction, combustion is performed between the lower heat transfer tubes. While the gas passes between the heat transfer tubes on the upper side, the heat transfer tubes are arranged in the same straight line in the horizontal direction at equal intervals, and alternately arranged in the vertical direction. In the staggered piping, the combustion gas that passes between the lower heat transfer tubes hits the upper heat transfer tubes and passes through the upper heat transfer tubes, so the staggered piping is more Heat transfer is good when the combustion gas hits the heat transfer tube on the side.

  Therefore, according to the present inventors' verification of the flow of the combustion gas passing through the inside of the heat exchanger using the heat exchanger fins 15 having the form shown in FIG. 9, the combustion gas hits the lower heat transfer tube 531, passes between adjacent lower heat transfer tubes 531, hits the upper heat transfer tube 532, and escapes upward. At this time, since the combustion gas does not pass through the upper surface side (a portion in the figure) of the lower heat transfer tube 531, the amount of heat transfer in the a portion of the combustion gas is small, and the heat exchanger fins 15 are not used effectively. I found out.

  And in what formed the burring hole in the intermediate part of the water exchange pipe for heat exchange of the upper stage side indicated by patent documents 1, the combustion pipe hits the heat exchanger pipe of the upper stage side, The amount of heat transfer into the lower heat transfer pipe is not improved because it does not hit much, and the lower water pipe insertion hole and the upper water pipe insertion hole are located above the lower water pipe insertion hole disclosed in Patent Document 2. In the case where the burring is formed approximately in the middle between the adjacent water pipe insertion holes, the combustion gas does not pass through the upper side of the lower heat transfer pipe as in the heat exchanger fin 15 shown in FIG. The amount of heat transfer in part a was small.

  The present invention includes a fin for a heat exchanger of a water heater that increases the amount of heat transfer to the inside of the lower heat transfer tube and improves the thermal efficiency by guiding the combustion gas toward the upper surface side of the lower heat transfer tube, and the same. An object is to provide a heat exchanger for a water heater.

(1) A heat exchanger fin in which a plurality of heat transfer tube insertion holes are arranged in a staggered manner in two upper and lower stages, and the flow of combustion gas rising from below is lowered on both sides of the upper portion of the lower heat transfer tube insertion holes. A heat exchanger fin of a water heater provided with a projection that leads in a direction toward the upper surface side of the heat transfer tube inserted into the heat transfer tube insertion hole on the side.
(2) The fin for a heat exchanger of a water heater as described in (1) above, wherein the protrusion is provided on an extension line at both ends of the lower heat transfer tube insertion hole.
(3) The heat exchange according to (1) or (2) above, wherein a notch extending from the lower end of the fin to the lower side of the upper heat transfer tube insertion hole is provided between adjacent lower heat transfer tube insertion holes. Dexterous fins.
(4) A hot water supply in which a plurality of heat exchanger fins according to any one of (1) to (3) are arranged in parallel at predetermined intervals, and the heat transfer tubes are inserted and fixed in the heat transfer tube insertion holes of the heat exchanger fins. Heat exchanger.
(Function)

As shown in FIG. 1 (a), the heat transfer tube insertion holes 21, 21, 21, which are positioned on the lower side of the heat exchanger fins 11 in which a plurality of heat transfer tube insertion holes 21, 22 are arranged in a staggered manner in two upper and lower stages. Protrusions 41 such as a round burring hole, an elliptical burring hole, a circular dowel shape, or an elliptic dowel shape as shown in FIG.
When the flow of the combustion gas passing through the inside of the heat exchanger using the heat exchanger fin provided with the projections 41, 41 will be described with reference to FIG. 4, the combustion gas flowing from below the heat exchanger fin 11 is shown in FIG. a) The lower heat transfer tubes 531 and 531 which are adjacent to the lower heat transfer tubes 531 respectively inserted in the heat transfer tube insertion holes 21 and 22 shown in FIG. It hits 532. Then, one of the combustion gases that hit the projection 41 passes through the side of the upper heat transfer tube 532, the other passes through the upper side of the lower heat transfer tube 531 (a portion shown in the drawing), and passes through the a portion. Heat is transferred from the combustion gas to the refrigerant in the lower heat transfer tube 531.

  The heat exchanger fin according to the present invention guides the flow of the combustion gas rising from below to the upper side of the heat transfer tube inserted into the lower heat transfer tube insertion hole on both sides of the upper portion of the lower heat transfer tube insertion hole. A projection is provided, and the combustion gas that flows upward from below the heat exchanger fins passes through the vicinity of the upper surface side (upper side) of the lower heat transfer tube, so that the amount of heat transferred to the refrigerant in the lower heat transfer tube Will increase.

  According to the heat exchanger fin of the water heater of the present invention, the amount of heat transferred to the refrigerant inside the heat transfer tube inserted into the heat transfer tube insertion hole on the lower side of the heat exchanger fin is increased, and the size of the heat exchanger fin is increased. The heat efficiency of the heat exchanger can be increased without doing so.

  The protrusions provided on the upper both sides of the lower heat transfer tube insertion hole in the heat exchanger fin described in the present invention are arranged at both ends of the lower heat transfer tube insertion hole so that the combustion gas passes near the upper surface side of the lower heat transfer tube. It is preferable to provide near the center of the lower side, the heat transfer tube insertion hole, and the upper side heat transfer tube insertion hole.

  It is preferable that a notch extending from the lower end of the fin to the lower side of the upper heat transfer tube insertion hole is provided between adjacent lower heat transfer tube insertion holes of the heat exchange fin described in the present invention.

  The heat exchanger fin according to the present invention includes a plurality of heat exchanger fins arranged in parallel, and penetrates the lower heat transfer tube insertion hole and the upper heat transfer tube insertion hole perpendicularly to the front surface of the heat exchanger fin. Thus, the heat exchanger is configured by inserting the heat transfer tubes respectively.

Hereinafter, the fins for heat exchangers of the present invention will be specifically described with reference to FIGS.
1A is a front view of a fin for a heat exchanger according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. It is BB expanded sectional drawing shown in a).
In FIG. 1 (a), the heat exchanger fins 11 are arranged in a zigzag manner with four heat transfer tube insertion holes 21 in the lower horizontal direction and three heat transfer tube insertion holes in the upper horizontal direction. Arc-shaped cuts 31 and 31 are formed at two places on the upper part of the heat exchanger fin 11, and 32 and 32 are cut and raised on both left and right ends of the heat exchanger fin 11. Notches 33, 33, 33 extending from the lower end of the tube to the lower side of the heat transfer tube insertion hole 22 on the upper stage side are provided. The positions of the arc-shaped cuts and protrusions 31 were set on the center line of the lower heat transfer tube insertion hole 21.

  On the upper both sides of each of the lower heat transfer tube insertion holes 21, 21, 21, 21, 21 in the vicinity of the center of the lower heat transfer tube insertion hole 21 and the upper heat transfer tube insertion hole 22, FIG. The protrusion 41 (diameter 6 mm) which consists of a round burring hole of the cross-sectional shape shown in FIG.

In addition to the shape shown in FIG. 1, the protrusion 41 is a combustion gas such as an elliptic burring hole shown in FIG. 2A, a circular dowel shape shown in FIG. 2B, or an elliptic dowel shape shown in FIG. May be of any shape that guides the heat transfer tube through the lower heat transfer tube insertion hole 21 toward the upper surface of the heat transfer tube.
In addition, the expanded sectional view by the BB cross section in Fig.2 (a)-(c) is shown to Fig.3 (a)-(c).

  In the embodiment, the heat exchanger fin 11 is formed to have an outer shape with a plate thickness of 0.3 mm, a height dimension of 54 mm, and a width dimension of 126 mm, and the lower heat transfer tube insertion holes 21 and the upper heat transfer tube insertion holes 22. The pitch of each was 33 mm, and the hole diameters of the heat transfer tube insertion holes 21 and 22 were 16.2 mm.

  77 heat exchanger fins 11 shown in FIG. 1 are juxtaposed in a fin pitch of 2.6 mm, and pass through the lower heat transfer tube insertion hole 21 and the upper heat transfer tube insertion hole 22 of each heat exchanger fin 11. Thus, the heat exchanger tube shown in FIG.

  When the thermal efficiency of the water heater provided with the heat exchanger fins described above was measured, the thermal efficiency was improved by about 3% compared to the heat exchanger fins 15 having no protrusions shown in FIG.

The heat exchanger fin by one Example of this invention is shown, (a) is a front view, (b) is AA sectional drawing in (a), (c) is BB expanded cross section in (a). FIG. (A)-(c) is a front view of the fin for heat exchangers by FIG. 1 and another Example, respectively. 2A is an enlarged sectional view taken along the line BB in FIG. 2A, FIG. 2B is an enlarged sectional view taken along the line BB in FIG. 2B, and FIG. 2C is a sectional view taken along the line BB in FIG. It is an expanded sectional view. It is explanatory drawing which shows the flow of the combustion gas inside the heat exchanger using the fin for heat exchangers of this invention. It is explanatory sectional drawing which shows the structure of a water heater. (A) is AA sectional drawing of the heat exchanger shown in FIG. 7, (b) is BB sectional drawing of the heat exchanger shown in FIG. It is a perspective view of a heat exchanger. It is a front view of the fin for heat exchangers by a prior art example. It is explanatory drawing which shows the flow of the combustion gas inside the heat exchanger using the fin for heat exchangers shown in FIG.

Explanation of symbols

11 Fins for heat exchanger 15 Fins for heat exchanger (conventional example)
21 Heat transfer tube insertion hole (lower side) 22 Heat transfer tube insertion hole (upper side)
31 Cut and Raised 32 Cut and Raised 33 Notched 41 Projection 5 Heat Exchanger 51 Outer Body 52 Snake Tube 531 Heat Transfer Tube (Lower Side)
532 Heat Transfer Tube (Upper Side) 6 Water Heater 61 Exterior 62 Combustion Unit 621 Burner 63 Exhaust Chamber 70 Water Flow 71 Combustion Gas Flow

Claims (4)

A plurality of heat transfer tube insertion holes are heat exchanger fins arranged in a staggered manner in two upper and lower stages, and the flow of combustion gas rising from below is transferred to the lower side of the heat transfer tube insertion holes on the lower side. A heat exchanger fin for a water heater provided with a protrusion that leads in a direction toward the upper surface side of the heat transfer tube inserted through the heat tube insertion hole. The fin for a heat exchanger of a hot water heater according to claim 1, wherein the protrusion is provided on an extended line at both ends of the lower heat transfer tube insertion hole. The heat exchanger fin according to claim 1 or 2, wherein a notch extending from the lower end of the fin to the lower side of the upper heat transfer tube insertion hole is provided between adjacent lower heat transfer tube insertion holes. A plurality of heat exchanger fins according to any one of claims 1 to 3 are arranged in parallel at predetermined intervals, and heat exchange for a water heater is formed by inserting and fixing a heat transfer tube into a heat transfer tube insertion hole of each heat exchanger fin. vessel.

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