JP2005121288A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger in which a fixed interval of a number of fins to be stacked can be easily and precisely held, and the sheet-like fins can be connected flattened heat exchanger tubes in a satisfactorily closed state. <P>SOLUTION: In this fin-and-tube type heat exchanger, substantially cylindrical fin collars with flanged top having a height equal to the fixed interval for the fins to be stacked are provided at both ends of each fin. According to such a structure, the fixed interval for the fins to be stacked can be easily and precisely held. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is used in an air conditioner, a refrigerator, and the like, and is composed of a gas such as air flowing between a plurality of stacked flat fins and a fluid such as water and refrigerant flowing in a flat heat transfer tube. The present invention relates to a fin-and-tube heat exchanger that transfers heat between the two.

  In general, a fin-and-tube heat exchanger composed of a large number of laminated flat fins and flat heat transfer tubes is laminated in parallel at regular intervals as shown in FIG. A large number of plate-like fins 1 through which a gas such as air flows, and inserted into these fins 1 at a predetermined pitch at a substantially right angle, a fluid such as water or refrigerant flows inside, and the outer periphery of the cross section is flat. The heat pipe 4 and both ends of the heat transfer pipe 4 are connected to each other, and the heat transfer pipe 4 and the header 5 forming a refrigerant flow path are configured.

As shown in FIGS. 22 and 23, the fin 1 of the conventional heat exchanger has an inverted trapezoidal shape in which the tip width of the fin 1 is wider than the root width in order to maintain a constant interval between the fins 1 to be stacked. The rising piece 12 is provided. In addition, in order to insert the heat exchanger tube 4 in the fin 1, the through-hole 13 is provided (for example, refer patent document 1 and patent document 2).
Japanese Utility Model Publication No. 60-60590 (first page, FIG. 2) Japanese Patent Laid-Open No. 3-63499 (page 2-3, FIG. 1)

  However, in the above-described conventional configuration, the rising piece 12 is cut off from the fin except for the root and is simply raised to the fin base so that the rising piece easily falls down. In addition, there has been a problem that the original purpose of accurately maintaining a predetermined interval between the fins 1 to be laminated cannot be achieved.

  The present invention solves such a conventional problem, and easily maintains a fixed interval between a large number of laminated fins, and satisfactorily closely bonds a flat fin and a flat heat transfer tube. An object of the present invention is to provide a heat exchanger that can be used.

  In order to solve the above-described problems, the heat exchanger of the present invention is configured such that fins are flanged at the tips thereof, and substantially cylindrical fin collars having the same interval and height between the stacked fins are provided at both ends of the fins. It is provided.

  As in the above configuration, the fins are laminated by providing the fins with flanges whose ends are flanged and having substantially cylindrical fin collars having the same interval and height as the laminated fins at both ends. The fixed interval can be easily and accurately maintained.

  In the heat exchanger according to the present invention, fins are provided with fins having substantially cylindrical fin collars having a height equal to a constant interval between fins, the tips of which are flanged at the tips. According to this structure, there exists an effect that the fixed space | interval of the said fin laminated | stacked can be hold | maintained correctly correctly.

  According to a first aspect of the present invention, a plurality of plate-like fins that are stacked in parallel at regular intervals and through which a gas such as air flows, and are inserted at a predetermined pitch substantially perpendicular to the fins, the fins In a fin-and-tube heat exchanger composed of a heat transfer tube having a flat cross-sectional outer periphery, in which a fluid such as water or refrigerant flows, the tip of the fin is flanged, By providing substantially cylindrical fin collars that are equal in height to the fixed intervals of the fins at both ends of the fins, the fixed intervals of the stacked fins can be easily and accurately maintained.

  In particular, in addition to the first invention, the second invention inserts both ends of the fin and the flat heat transfer tube into a substantially cylindrical fin collar having a height equal to the fixed interval between the fins, and is closely bonded. In order to do this, the tip of the fin around the substantially rectangular through-hole formed in the fin is flanged, and a substantially cylindrical fin collar having the same interval and height as the fins to be laminated is provided in the fin. By providing at least one other than the both end portions, it is possible to easily and accurately maintain a constant interval between the laminated fins.

  The third invention occurs particularly when the heat exchanger is used as an evaporator by providing the heat transfer tube of the first invention so as to have an inclination of approximately 5 ° to 60 ° with respect to the horizontal direction. Condensate around the fins and the heat transfer tubes flows smoothly due to gravity due to the inclination of the upper surface of the heat transfer tubes, preventing an increase in the ventilation resistance of the heat exchanger, resulting in improved evaporation performance and heat exchange with air The required power of the industrial fan can be reduced, and a high-performance heat exchanger can be realized.

  In particular, the fourth aspect of the present invention is a substantially constant interval of fins stacked in the region between the heat transfer tubes adjacent to each other in the direction perpendicular to the main flow of gas on the surface of the fin of any one of the first to third aspects of the invention. By providing a louver having a height of 1/2 and opening in the gas main flow direction, excellent ventilation characteristics and heat transfer performance can be obtained.

  In a fifth aspect of the present invention, in particular, a constant interval between the fins stacked in a region between the heat transfer tubes adjacent to each other in a direction perpendicular to the main flow of gas on the surface of the fin of any one of the first to third aspects. By providing a cut and raised opening in the direction of the gas main flow having a height of about 1/4 to about 3/4, excellent ventilation characteristics and heat transfer performance can be obtained.

  In the sixth aspect of the invention, in particular, by setting the width of the raised surface of the fin of the fifth aspect of the invention to about 2/5 to about 1/2 of the width of the fin base, excellent ventilation characteristics and heat transfer performance can be obtained. can get.

  In the seventh aspect of the invention, in particular, in a region between the heat transfer tubes adjacent in the direction perpendicular to the main flow of gas on the surface of the fin of any one of the first to third aspects, By providing the valleys alternately, excellent ventilation characteristics and heat transfer performance can be obtained.

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

(Embodiment 1)
1 is a cross-sectional view of a fin of the fin-and-tube heat exchanger according to the first embodiment, and FIG. 2 is a cross-sectional view of the fin of FIG.

1 and 2, a plurality of plate-like fins 1 that are stacked in parallel at regular intervals and through which a gas such as air flows are inserted into the fins 1 at a predetermined pitch substantially at right angles, and the fins. 1 is composed of a heat transfer tube 4 having a flat outer periphery, in which a fluid such as water or a refrigerant flows, and is further laminated on the fin 1 with its tip flanged. Two substantially cylindrical fin collars 2 having a height equal to the constant interval between the fins are provided at both ends of the fin 1.

  And according to this embodiment, the fixed interval Pf of the fins 1 to be stacked is equal to the fixed interval Pf of the fins 1 to be stacked, and the substantially cylindrical fin collar 2 having the tip flanged. Can be easily and accurately held.

(Embodiment 2)
3 is a cross-sectional view of the fin of the fin-and-tube heat exchanger according to the second embodiment, and FIG. 4 is a cross-sectional view of the fin of FIG.

  3-4, the flat fins 1 are stacked in parallel at regular intervals, and a plurality of plate-like fins 1 through which a gas such as air flows are inserted between the fins 1 at a substantially right angle at a predetermined pitch. 1 is composed of a heat transfer tube 4 having a flat outer periphery, in which a fluid such as water or a refrigerant flows, and is further laminated on the fin 1 with its tip flanged. Two substantially cylindrical fin collars 2 having a height equal to the fixed interval between the fins are provided inside the heat transfer tube 4 where both ends of the fin 1 are installed. Thus, by providing the fin collar 2 in the vicinity of both ends of the fin 1, the height of the fins 1 to be stacked is equal to the constant interval Pf, and the tip of the fin collar 2 has a substantially cylindrical fin collar 2 in which the tip is flanged. The constant interval Pf between the fins 1 to be stacked can be easily and accurately maintained.

(Embodiment 3)
5 is a cross-sectional view of the fin of the fin-and-tube heat exchanger according to the third embodiment, and FIG. 6 is a cross-sectional view of the fin of FIG.

  5-6, the flat fins 1 are stacked in parallel at regular intervals, and a plurality of plate-like fins 1 through which a gas such as air flows are inserted into the fins 1 at a predetermined pitch substantially at right angles. 1 is composed of a heat transfer tube 4 having a flat outer periphery, in which a fluid such as water or a refrigerant flows, and is further laminated on the fin 1 with its tip flanged. In addition to two substantially cylindrical fin collars 2 having the same height as the constant interval of the fins provided at both ends of the fin 1, at least one fin collar 2 is provided at both ends of the fin 1.

  And according to this embodiment, the fixed interval Pf of the fins 1 to be stacked is equal to the fixed interval Pf of the fins 1 to be stacked, and the substantially cylindrical fin collar 2 having the tip flanged. Can be easily and accurately held in the first and second embodiments.

(Embodiment 4)
FIG. 7 is a cross-sectional view of the fins of the fin-and-tube heat exchanger according to the fourth embodiment, and FIG. 8 is a cross-sectional view of the fins of FIG.

  7 to 8, the difference from the first to third embodiments is that the heat transfer tube 4 is provided with an inclination of about 5 to 60 ° with respect to the horizontal direction.

  And according to this embodiment, the fixed interval Pf of the fins 1 to be stacked is equal to the fixed interval Pf of the fins 1 to be stacked, and the generally cylindrical fin collar 2 having the tip flanged. And the condensed water around the fins and heat transfer tubes generated when the heat exchanger is used as an evaporator flows down smoothly due to gravity due to the inclination of the upper surface of the heat transfer tubes, An increase in ventilation resistance of the heat exchanger can be prevented, resulting in an improvement in evaporation performance and a reduction in the required power of the blower for heat exchange with air, and a high performance heat exchanger can be realized.

(Embodiment 5)
9 is a cross-sectional view of the fin of the fin-and-tube heat exchanger according to the fifth embodiment, and FIG. 10 is a cross-sectional view of the fin of FIG.

  9 to 10, the plate-like fins 1 are stacked in parallel at regular intervals, and a plurality of plate-like fins 1 through which a gas such as air flows are inserted into the fins 1 at a predetermined pitch substantially at right angles. 1 is composed of a heat transfer tube 4 having a flat outer periphery, in which a fluid such as water or a refrigerant flows, and is further laminated on the fin 1 with its tip flanged. Two substantially cylindrical fin collars 2 having a height equal to the constant interval between the fins are provided at both ends of the fin 1.

  11 is a perspective view of a fin of the fin-and-tube heat exchanger according to the fifth embodiment, and FIG. 12 is an enlarged cross-sectional view of the fin of FIG. 11 taken along line AA, in which three fins are stacked.

  11 to 12, the through hole 13 formed in the fin 1 for inserting and closely bonding the heat transfer tube 4 has a shape substantially along the outer circumference of the flat heat transfer tube 4, that is, a substantially rectangular shape, and the substantially rectangular penetration From one of the two long sides of the hole 13, there is a fin collar 21 that rises substantially perpendicular to the fin 1 at a height equal to the fixed interval Pf of the laminated fins, and that the leading end of the fin 13 is bent outwardly of the through hole 13. Is provided. On the long side opposite to one long side of the substantially rectangular through-hole 13 provided with the fin collar 21 having a height equal to the fixed interval Pf of the fins 1 to be stacked, the fixed interval Pf of the fins 1 to be stacked is A fin collar 22 having a low height is provided. A louver 23 that opens in the gas main flow direction is provided in a region between the heat transfer tubes 4 adjacent to each other in the direction perpendicular to the gas main flow direction, that is, in the step direction, on the surface of the fin 1. The height Hl of the louver 23 is formed to be approximately equal to ½ of the constant interval Pf of the fins 1 to be laminated.

  In the above-described configuration, the fins 1 to be laminated are formed by the fin collar 21 that rises substantially perpendicular to the fin 1 at a height equal to the fixed interval Pf of the laminated fins and further bends the tip of the rising toward the outside of the through hole 13. The fixed interval Pf can be easily and accurately maintained, and the height is high over almost the entire circumference of the substantially rectangular through-hole 13 opened in the fin in order to insert and flatly join the flat heat transfer tube 4. Since the fin collar 21 or the fin collar 22 having a low height is provided, the adhesion between the flat fin 1 and the flat heat transfer tube 4 can be improved. In addition, the fin 1 that is provided in a region between the heat transfer tubes 4 adjacent in the direction perpendicular to the gas main flow direction, that is, in the step direction, on the surface of the fin 1 and in which the height Hl is laminated is fixed. The louver 23 which is approximately ½ of the distance Pf provides excellent ventilation characteristics and heat transfer performance, and has a substantially cylindrical shape in which the height of the laminated fins 1 is equal to the constant distance Pf and the tips thereof are flanged. With the fin collar 2, the fixed interval Pf of the fins 1 to be stacked can be easily and accurately maintained.

(Embodiment 6)
13 is a cross-sectional view of a fin of the fin-and-tube heat exchanger according to the sixth embodiment, and FIG. 14 is a cross-sectional view of the fin of FIG.

  13-14, while being laminated | stacked in parallel with a fixed space | interval, it inserts in the predetermined pitch substantially orthogonally to many flat fins 1 and the fins 1 in which gas, such as air, flows, between the said fins 1 is composed of a heat transfer tube 4 having a flat outer periphery, in which a fluid such as water or a refrigerant flows, and is further laminated on the fin 1 with its tip flanged. Two substantially cylindrical fin collars 2 having a height equal to the constant interval between the fins are provided at both ends of the fin 1.

  15 is a perspective view of a fin of the fin-and-tube heat exchanger according to the sixth embodiment, and FIG. 16 is an enlarged cross-sectional view of the fin of FIG. 15 taken along the line AA, in which three fins are stacked.

  15 to 16, the through hole 13 opened in the fin 1 for inserting and closely bonding the heat transfer tube 4 has a shape substantially along the outer circumference of the flat heat transfer tube 4, that is, a substantially rectangular shape, and the substantially rectangular penetration The two opposite long sides of the hole 13 are alternately raised with a predetermined width from a part of the long side of the through hole 13 so as to rise substantially perpendicular to the fin 1 at a height equal to the fixed interval Pf of the fins 1 to be stacked. A fin collar 31 is provided in which the leading end of the rising portion is bent toward the outside of the through hole 13. A fin having a height lower than the fixed interval Pf of the laminated fins 1 except that a fin collar 13 having a height equal to the fixed interval Pf of the laminated fins 1 is provided around the substantially rectangular through hole 13. A collar 32 is provided. In the region between the heat transfer tubes 4 adjacent to each other in the direction perpendicular to the gas main flow direction, that is, in the step direction, on the surface of the fin 1 is provided a cut and raised 33 that opens in the gas main flow direction. The height of the cut and raised is formed to be approximately ¼ to approximately ¾ of the constant interval Pf of the fins 1 to be stacked, and the width Ws of the cut and raised 33 is about 2 of the width Wb of the fin base. / 5 to about 1/2.

  And according to this embodiment, by the fin collar 31 which rises substantially perpendicular to the fin 1 at a height equal to the constant interval Pf of the laminated fins, and further, the leading end of the rise is bent toward the outside of the through hole 13. The fixed interval Pf of the fins 1 to be stacked can be easily and accurately maintained, and the substantially rectangular through hole 13 formed in the fin for inserting and attaching the flat heat transfer tube 4 in close contact with each other. Since the fin collar 31 having a high height or the fin collar 32 having a low height is provided, the adhesion between the flat fin 1 and the flat heat transfer tube 4 can be improved. . In addition, the fin 1 having a height Hs that is open in the gas main flow direction and provided in a region between the heat transfer tubes 4 adjacent to the surface of the fin 1 in a direction perpendicular to the gas main flow direction, that is, in the step direction, is stacked. With the cut-and-raised portion 33 having a distance Pf of about 1/4 to about 3/4 and a width Ws of about 2/5 to about 1/2 of the width Wb of the fin base, excellent ventilation characteristics and heat transfer performance can be obtained. The constant interval Pf of the laminated fins 1 can be easily and accurately maintained by the substantially cylindrical fin collar 2 having the same height as the constant interval Pf of the laminated fins 1 and flanging at the tip thereof. it can.

(Embodiment 7)
17 is a cross-sectional view of the fin of the fin-and-tube heat exchanger according to the seventh embodiment, and FIG. 18 is a cross-sectional view of the fin of FIG.

  In FIGS. 17-18, while being laminated | stacked in parallel with a fixed space | interval, it inserts in the predetermined pitch substantially orthogonally to many flat fins 1 and fins 1 in which gas, such as air, flows, between the said fins 1 is composed of a heat transfer tube 4 having a flat outer periphery, in which a fluid such as water or a refrigerant flows, and is further laminated on the fin 1 with its tip flanged. Two substantially cylindrical fin collars 2 having a height equal to the constant interval between the fins are provided at both ends of the fin 1.

    19 is a perspective view of a fin of the fin-and-tube heat exchanger according to the seventh embodiment, and FIG. 20 is an enlarged cross-sectional view of the fin of FIG. 19 taken along line AA, in which three fins are stacked.

19 to 20, the through hole 13 opened in the fin 1 for inserting and closely bonding the heat transfer tube 4 has a shape substantially along the outer circumference of the flat heat transfer tube 4, that is, a substantially rectangular shape. A fin collar 41 is provided from each of the two short sides of the hole 13 so as to rise substantially perpendicular to the fin at a height equal to the fixed interval Pf of the laminated fins, and the rising tip is bent outwardly of the through hole 13. It has been. On the other hand, two long sides of the substantially rectangular through-hole 13 are provided with fin collars 42 that are lower than the fin collars 41 that are provided on the short sides and have a height equal to the fixed interval Pf of the fins to be stacked. Yes. In the region between the heat transfer tubes 4 adjacent to the surface of the fin 1 in the direction perpendicular to the gas main flow direction, that is, in the step direction, ridges 43 and valleys 44 whose ridge lines extend in the step direction are provided alternately.

  In the above-described configuration, from the two short sides of the substantially rectangular through hole 13, the fin rises substantially perpendicularly to the fin 1 at a height equal to the fixed interval Pf of the laminated fins, and the leading end of the rise is directed outward of the through hole 13. The bent fin collar 41 makes it possible to easily and accurately hold the fixed interval Pf of the laminated fins 1, and to the two long sides of the substantially rectangular through hole 13, the fixed interval Pf of the laminated fins Although the fin collar 42 is provided though the height is lower, the substantially rectangular through hole 13 is provided with the fin collar 41 having a high height or the fin collar 42 having a low height over substantially the entire circumference. It is possible to improve the adhesion between the fin 1 and the flat heat transfer tube 4. Further, in the region between the heat transfer tubes 4 adjacent to each other in the direction perpendicular to the gas main flow direction, that is, in the step direction, on the surface of the fin 1, ridges 43 and valleys 44 whose ridgelines extend in the step direction are alternately provided. As a result, excellent heat transfer performance can be obtained. In addition, when the heat exchanger configured as described above is used in an outdoor heat exchanger of an air conditioner and the outside air becomes cold during heating operation, it frosts on the surface of the fin, but the high performance is achieved by the temperature boundary layer leading edge effect. Like louvers and cuts that can be obtained, clogging is quick due to frost formation, and it is difficult for heating performance to drop rapidly. Further, the constant interval Pf of the laminated fins 1 can be easily and accurately held by the substantially cylindrical fin collar 2 having the same height as the constant interval Pf of the laminated fins 1 and flanged at the tips thereof. Can do.

  In each of the above embodiments, since a flat heat transfer tube is used, even if the tube thickness is the same, the tube diameter is small, so the pressure resistance increases, and particularly when using a high pressure carbon dioxide refrigerant, The heat exchanger of each embodiment is effective.

  Further, since the volume of the flat heat transfer tube is small, the amount of refrigerant can be reduced, and the heat exchanger of each of the above embodiments is effective when using HC refrigerant or the like that is a combustible refrigerant.

  It is possible to provide a heat exchanger that can easily and accurately maintain a fixed interval between a large number of laminated fins, realize a high-performance and low-cost heat exchanger, and save energy not only for air conditioners but also for energy-related equipment It can also be applied to applications such as conversion.

Sectional drawing of the fin which shows the 1st Embodiment of this invention AA sectional view in FIG. Sectional drawing of the fin which shows the 2nd Embodiment of this invention AA sectional view in FIG. Sectional drawing of the fin which shows the 3rd Embodiment of this invention AA sectional view in FIG. Sectional drawing of the fin which shows the 4th Embodiment of this invention AA sectional view in FIG. Sectional drawing of the fin which shows the 5th Embodiment of this invention AA sectional view in FIG. The perspective view of the fin which shows the 5th Embodiment of this invention AA cross-sectional enlarged view in FIG. 11 (lamination of three fins) Sectional drawing of the fin which shows the 6th Embodiment of this invention AA sectional view in FIG. The perspective view of the fin which shows the 6th Embodiment of this invention BB cross section enlarged view in FIG. 15 (lamination of 3 fins) Sectional drawing of the fin which shows the 7th Embodiment of this invention AA sectional view in FIG. The perspective view of the fin 1 which shows the 7th Embodiment of this invention CC cross-sectional enlarged view in FIG. 19 (lamination of three fins) A perspective view showing a basic configuration of a general fin and tube heat exchanger The top view of the fin of the 1st prior art example The top view of the fin of the 2nd prior art example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fin 2 Fin collar 4 Heat exchanger tube 13 Through-hole 21, 31, 41, 52 Fin collar 22, 32, 42, 51 with the height equal to the predetermined space | interval of the laminated fin Fin collar with low height 23 Louver 33 Cut and raise 43 Yamabe 44 Valley

Claims (7)

A plurality of plate-like fins that are stacked in parallel at regular intervals and through which a gas such as air flows, and are inserted at a predetermined pitch substantially perpendicular to the fins and closely joined to the fins. In a fin-and-tube heat exchanger composed of a heat transfer tube having a flat cross-sectional outer periphery through which a fluid such as water or a refrigerant flows, the fins are flanged at the tips, and the fins are spaced at constant intervals and heights. A heat exchanger characterized in that substantially cylindrical fin collars having the same length are provided at both ends of the fin. Around a substantially rectangular through-hole opened in the fin for tightly joining a generally cylindrical fin collar having a height equal to a constant interval between the fins by inserting both ends of the fin and the flat heat transfer tube The fins according to claim 1, wherein the fins are flanged, and at least one fin collar having a substantially cylindrical shape having a constant interval and a height equal to each other is provided at both ends of the fins. The heat exchanger according to 1. The heat exchanger according to claim 1 or 2, wherein the heat transfer tube is provided so as to have an inclination of approximately 5 ° to 60 ° with respect to a horizontal direction. In the region between the heat transfer tubes adjacent in the direction perpendicular to the main gas flow on the surface of the fin, a louver opening in the main gas flow direction at a height of approximately ½ of the fixed interval between the fins is provided. The heat exchanger according to any one of claims 1 to 3. Opened in the gas main flow direction at a height of about 1/4 to about 3/4 of the fixed interval of the fins to be stacked in a region between the heat transfer tubes adjacent to the main flow of gas on the surface of the fin in a direction perpendicular to the gas flow. The heat exchanger according to any one of claims 1 to 3, wherein a cut-and-raised portion is provided. 6. The heat exchanger according to claim 5, wherein the width of the cut and raised is about 2/5 to about 1/2 of the width of the fin base. The ridges and troughs whose ridgelines extend in a perpendicular direction are alternately provided in a region between the heat transfer tubes adjacent to the main flow of gas on the surface of the fin in a perpendicular direction. The heat exchanger in any one.

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