JP6236622B2 - Finned heat exchanger - Google Patents

Description

  The present invention relates to a finned heat exchanger mainly used for an air conditioner or the like.

  In general, as shown in FIG. 6, a conventional heat exchanger with fins is composed of a fin group 1 arranged at a predetermined interval and a heat transfer tube group 2 inserted through the fin group 1 at a substantially right angle. The gas X flows between the fins in the direction of the arrow to exchange heat with the fluid in the tubes of the heat transfer tube group 2.

  In such a heat exchanger with fins, in order to improve heat exchange performance while suppressing frost formation, a fin is bent into a mountain shape and a slit is provided on the leeward side of the fin (for example, a patent) Reference 1).

FIG. 7 shows the fins of the heat exchanger with fins described in the above-mentioned Patent Document 1, (a) is a partial plan view of the fins, (b) is a sectional view taken along line AA in (a), (c) is the figure which showed the frost form in the AA cross section of (a).

  In FIG. 7, the fin 111 has a plurality of holes 112 provided with a cylindrical collar portion 112a for inserting and fixing the heat transfer tube 112 at a predetermined interval. The fin 111 has an air flow for heat exchange indicated by arrows. On the other hand, a bent portion 113 having a gentle slope is provided on the leeward side with the central portion of the fin 111 as a boundary, and a slit 114 is provided in the central portion on the leeward side. As shown in FIG.

  The fin 111 has only the bent portion 113 on the windward side where frost formation is likely to occur, particularly during low-temperature heating operation, and air passages of almost equal intervals are created between the fins. Even if the edge portion 111a is frosted as shown in FIG. 7C, the frost layer 115 does not block the fins, and there is no risk of frost formation. Since there is a cut-and-raised slit 114 effective for improving the heat transfer to the air, the heat transfer is promoted, and as a result, the heat exchange performance is improved.

JP 2001-91101 A

  However, in the case of the fin configuration of Patent Document 1 described above, since the slit 114 is provided, unless the circulating air can be completely dehumidified on the windward side of the fin 111, It is difficult to avoid clogging between the fins 111 due to frost layer growth, and during normal heating operation in which condensed water tends to cover the entire fin surface, a condensed water bridge is generated at the slit 114 portion on the leeward side. Concerned.

  This invention is made in view of such a point, and provides the heat exchanger with a fin which can suppress the obstruction | occlusion between fins by condensed water or frost formation also at the time of heating operation, improving the heat transfer performance of a fin. Is.

In order to solve the above problems, the present invention provides a plurality of fins arranged in parallel so as to form a gas flow path, and a heat transfer tube in which a medium penetrating the fin and exchanging heat with the gas flows. The fin is provided with a substantially semicircular arc-shaped rising collar portion at the leeward edge of the heat transfer tube, and the rising collar portion is arranged in a staggered arrangement with the heat transfer tube in the gas flow direction. And arranging the fins in a plurality of rows in the gas flow direction, and further arranging the substantially semicircular arc-shaped collar portions so as to face each other, thereby forming one substantially circular collar. This is a heat exchanger with fins .

As a result, on the leeward side of the fin, the semi-arc-shaped rising collar portion is in a staggered arrangement with respect to the heat transfer tube, so that the accelerated wind immediately after passing through the heat transfer tube is in front of the windward side of the rising collar portion Colliding and generating a high heat transfer coefficient according to the front side of the heat transfer tube. Moreover, in addition to the heat transfer promotion by this, the rising collar part is configured in an arc shape to suppress collision loss, and the flow avoiding the rising collar part serves to reduce the dead water area on the back of the heat transfer tube. Thus, an increase in ventilation resistance can be suppressed. Further, the condensed water generated during the heating operation and the drain after the defrosting operation can smoothly slide on the arc surface of the start-up collar portion to the fin leeward edge and can be quickly drained. Further, even during frost formation, by providing the rising collar portion at the leeward edge portion, a sufficiently wide interval between the heat transfer tube and the rising collar portion can be secured, and early clogging due to frost can be avoided.

  INDUSTRIAL APPLICABILITY The present invention can provide a finned heat exchanger that exhibits high-level heat exchange performance while suppressing the effects of frost formation and condensed water regardless of the type of cooling / heating operation.

The fin of the heat exchanger with a fin in Embodiment 1 of this invention is shown, (a) is a fragmentary top view of a fin, (b) is sectional drawing in the AA of (a). It is a figure explaining the effect | action of the heat exchanger with a fin in Embodiment 1 of this invention and the heat exchanger with a conventional fin, (a) is the figure which showed the wind flow and dead water area on a conventional fin, (b) The figure which showed the wind flow and dead water area on the fin in Embodiment 1 of this invention The figure which showed the condensed water drainage state on the fin of the heat exchanger with a fin in Embodiment 1 of this invention It is a figure explaining the effect | action of the heat exchanger with a fin in the reference example 1 of this invention, and the conventional heat exchanger with a fin, (a) showed the wind flow and dead water area on the conventional multi-row heat exchanger fin. The figure which showed the wind flow and dead water area on the multi-row heat exchanger fin in the reference example 1 of this invention, (b) The figure which showed the wind flow and dead water area on the heat exchanger fin of the heat exchanger with a fin in Embodiment 2 of this invention A perspective view of a conventional finned heat exchanger A conventional finned heat exchanger is shown, (a) is a partial plan view of the fin, (b) is a sectional view taken along the line AA of (a), and (c) is a sectional view taken along the line AA of (a). Of frost formation

A first invention includes a plurality of fins arranged in parallel so as to form a gas flow path, and a heat transfer tube through which the medium passing through the fin and exchanging heat with the gas flows, The fin is provided with a substantially semi-circular rising collar portion at the leeward edge of the heat transfer tube, and the rising collar portion is arranged in a staggered arrangement with the heat transfer tube in the gas flow direction. The fins are arranged in a plurality of rows in the gas flow direction, and the substantially semicircular arc-shaped rising collar portions are arranged so as to face each other, thereby constituting one substantially circular collar. It is a heat exchanger with a fin .

  As a result, on the leeward side of the fin, the semi-arc-shaped rising collar portion is positioned so as to form a staggered arrangement with respect to the heat transfer tube, so that the accelerated wind immediately after passing through the heat transfer tube is raised. It is possible to generate a high heat transfer coefficient according to the windward front side of the heat transfer tube.

  Moreover, in addition to the heat transfer promotion by this, the rising collar part is configured in an arc shape to suppress collision loss, and the flow avoiding the rising collar part serves to reduce the dead water area on the back of the heat transfer tube. Thus, an increase in ventilation resistance can be suppressed.

  Further, the condensed water generated during the heating operation and the drain after the defrosting operation can smoothly slide on the arc surface of the start-up collar portion to the fin leeward edge and can be quickly drained.

Further, even during frost formation, by providing the rising collar portion at the leeward edge portion, a sufficiently wide interval between the heat transfer tube and the rising collar portion can be secured, and early clogging due to frost can be avoided. With these effects, it is possible to maintain a high level of heat exchange performance while suppressing the influence of frost formation regardless of the operation type of cooling / heating .

Moreover, since the substantially circular collar formed by the substantially semicircular arc-shaped rising collar portions is positioned like the heat transfer tubes arranged in a staggered manner, when assuming a heat exchanger with two rows of fins, Heat exchange performance can be improved without increasing the size of the heat exchanger and the number of heat transfer tubes, and a high heat transfer effect can be obtained as in a heat exchanger of a three-row fin row.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows fins of a heat exchanger with fins according to Embodiment 1 of the present invention, (a) is a partial plan view of the fins, (b) is a cross-sectional view taken along line AA of (a), FIG. These are the figures explaining the effect | action of the heat exchanger with a fin in the same Embodiment 1, and the conventional heat exchanger with a fin, (a) is the figure which showed the wind flow and dead water area on the conventional fin, (b) The figure which showed the wind flow and dead water area on the fin in Embodiment 1 of this invention, FIG. 3: is the figure which showed the condensed water drainage state on the fin of the heat exchanger with a fin in Embodiment 1. FIG.

  1 to 3, the heat exchanger with fins according to the first embodiment of the present invention includes a plurality of fins 1 arranged in parallel to form a flow path for the gas X, and the fin 1 is made of the gas X. It is arranged and penetrated substantially perpendicular to the flow direction, and includes a heat transfer tube 2 through which a medium that exchanges heat with the gas X flows.

  The fin 1 has a substantially semicircular arc-shaped rising collar portion 5 formed so as to be connected to the leeward edge 4 located on the leeward side of the heat transfer tube 2, and the substantially semicircular shape. The arc-shaped rising collar portion 5 is arranged in a staggered arrangement with the heat transfer tubes 2 with respect to the flow direction of the gas X.

  Below, the effect of Embodiment 1 is demonstrated.

  The gas X flows between the fins 1 and exchanges heat with the medium in the heat transfer tube 2. However, since the accelerated wind immediately after passing through the heat transfer tube 2 collides with the windward front side of the collar portion 5, the heat transfer tube The high heat transfer coefficient according to the windward front of 2 can be generated. In addition to the heat transfer promotion, the rising collar portion 5 is formed in an arc shape to suppress a collision loss. Further, as shown in FIG. 2B, a flow 6 that avoids the rising collar portion 5 is a heat transfer tube. 2 Since it functions to reduce the dead water area 7 on the back, compared with the case of the conventional fin shown in FIG. 2A, the heat transfer effective area can be expanded and the increase in ventilation resistance can be suppressed. Also, for condensed water generated during heating operation and drain after defrosting operation, as shown in FIG. 3, condensed water 8 smoothly rises up to the leeward edge 4 on the arc surface of the collar portion 5. It can slide and drain quickly. Even in the case of frost formation, by providing the rising collar portion 5 at the leeward edge 4 portion, a sufficiently wide space between the heat transfer tube 2 and the rising collar portion 5 can be secured, and early clogging due to frost can be avoided. it can. With these effects, it is possible to maintain a high level of performance regardless of the type of cooling / heating operation.

( Reference Example 1 )
FIG. 4 is a diagram for explaining the operation of the finned heat exchanger and the conventional finned heat exchanger in Reference Example 1 of the present invention, and (a) shows the wind flow and dead water area on the conventional multi-row heat exchanger fins. (B) It is the figure which showed the wind flow and dead water area on the multi-row heat exchanger fin in the reference example 1 of this invention.

The heat exchanger of the reference example 1 is configured by arranging a plurality of rows of fins in the flow direction of the gas X as shown in FIG. Of the fins, the fin on the windward side is the conventional fin 1a, that is, the mountain-shaped fin 1a that does not have the substantially semi-arc-shaped rising collar portion 5, and the fin on the leeward side is the first embodiment. As the fin 1 provided with the rising collar portion 5 described above in the leeward edge 4 portion, the substantially semicircular arc-shaped rising collar portion 5 is positioned on the most leeward side in the gas flow direction.

Next, effects of the finned heat exchanger having the above-described configuration will be described. First, when only a plurality of conventional fins 1a are arranged, as shown in FIG. 4 (a), in the fin 1a located on the most downstream side, the heat transfer tubes 2 arranged in a staggered manner having the function of reducing the dead water area 7 are leeward. Therefore, a large dead water area 7 is generated on the back side of the heat transfer tube 2. However, when the fin 1 provided with the rising collar portion 5 at the leeward edge 4 portion is arranged on the most downstream side as in the reference example 1, the rising collar portion 5 is windward as shown in FIG. The function of reducing the dead water area 7 of the upper fin 1a is exhibited, and the dead water area of the entire heat exchanger can be kept small. Thereby, expansion of an effective heat transfer area and suppression of ventilation resistance are attained, and heat exchange performance can be improved.

In the reference example 1 , the fins are arranged in two rows with respect to the gas flow direction. However, more fins may be arranged, and in that case, the leeward edge 4 of the fins in the leeward row. It is only necessary to provide a start-up collar portion 5.

( Embodiment 2 )
FIG. 5 shows the fins of the heat exchanger with fins according to the second embodiment of the present invention, and shows the wind flow and dead water area on the heat exchanger fins.

  The heat exchanger of the second embodiment is also configured by arranging a plurality of rows of fins in the gas X flow direction. Each of the fins has a configuration in which the substantially semi-arc-shaped rising collar portion 5 is provided on the leeward edge 4 described in the first embodiment, and each of the fins 1 has a substantially semi-arc-shaped rising. The collar portions 5 are arranged so as to face each other to form one substantially circular collar.

  In the finned heat exchanger configured as described above, the substantially semicircular arc-shaped rising collar portions 5 face each other to form one substantially circular collar. For example, when assuming a heat exchanger with a two-row fin array as shown in FIG. 5 without increasing the size of the heat exchanger or the number of heat transfer tubes, for example, as shown in FIG. A heat transfer effect equivalent to that of a heat exchanger can be obtained.

  INDUSTRIAL APPLICABILITY The present invention can provide a finned heat exchanger that exhibits a high level of heat exchange performance while suppressing the effects of frost formation and condensed water, and is used for heat pump devices such as water heaters and refrigeration / air conditioning equipment. It can be widely used as an attached heat exchanger.

DESCRIPTION OF SYMBOLS 1,111 Fin 2,112 Heat transfer tube 4 Downward edge 5 Startup collar part 6 Wind flow 7 Dead water area 8 Condensed water X Gas (direction)

Claims (1)

A plurality of fins arranged in parallel so as to form a gas flow path; and a heat transfer tube penetrating the fin and through which a medium that exchanges heat with the gas flows, wherein the fin includes the heat transfer tube. A rising collar portion having a substantially semicircular arc shape is provided at the leeward side edge of the gas, and the rising collar portion is arranged so as to be in a staggered arrangement with the heat transfer tubes with respect to the gas flow direction. The fins are arranged in a plurality of rows, and the substantially semicircular arc-shaped rising collar portions are arranged so as to face each other, thereby forming one substantially circular collar. vessel.

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