JP2009275967A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems on cut and raised pieces of a fin, wherein ventilating resistance of gas passing through a heat exchanger is increased though a heat transfer coefficient is improved by vertical vortex generated in the wake, and frost is easily attached, in particular, to the cut and raised pieces of high heat transfer coefficient, and rapidly grows up, when the heat exchanger as an evaporator is used below freezing point, which causes significant increase of ventilating resistance. <P>SOLUTION: The cuts and raised pieces 11 formed by making cutouts 15 of the bent shape or curved shape on the fin 10, folding them at a fundamental line 16, and roughly vertically raising them on a fin face, are disposed much at a leeward side where the gas flows out, and more in accordance with separating from a heat transfer tube, thus frost formation on a fin surface can be unified, and the increase of ventilating resistance in accompany with the growth of frost below the freezing point can be suppressed. Further by disposing a raised piece 47 higher than the fin collar 43, a distance to the adjacent fin can be increased, and the increase of ventilating resistance can be further suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is used in an air conditioner, a refrigerator, a heat pump type water heater, etc., and a gas such as air flowing between a plurality of laminated plate-like fins and a fluid such as water or a refrigerant flowing in a heat transfer tube It is related with the fin and tube type heat exchanger which transfers heat | fever between.

In general, a fin-and-tube heat exchanger composed of a large number of laminated flat fins and heat transfer tubes is laminated in parallel at a constant pitch as shown in FIG. A large number of plate-like fins 101 through which the gas W flows, and heat transfer tubes 104 inserted into these fins 101 at a predetermined pitch substantially at right angles and through which fluid R such as water or refrigerant flows, The heat transfer tube 104 is tightly joined to a cylindrical fin collar 102 that rises perpendicularly to the outer periphery of the through hole of the fin 101. Further, the fin 101 is provided with cut and raised pieces 111 and 112 as shown in FIGS. 10, 11, and 12 in the slit forming portion 103. Then, as shown in FIG. 12, the cut-and-raised piece 111 of the conventional heat exchanger is gradually narrowed from the base portion toward the tip portion, and the blade portion that generates the vertical vortex S in the passing air is cut and raised from the flat plate fin. Form. This vertical vortex improves the heat transfer coefficient (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2005-207688

  However, although the heat transfer coefficient is improved by the vertical vortex S generated in the wake of the cut and raised piece 111 in the conventional configuration, the ventilation resistance when the gas passes through the heat exchanger is increased. . For this reason, as the number of the cut-and-raised pieces 111 increases, the ventilation resistance greatly increases, which places a burden on the fan and increases the input of the fan motor.

  In addition, when the heat exchanger is used as an evaporator, condensed water adheres to the fin surface and usually drops along the fin surface. However, when the temperature of the refrigerant is 0 ° C. or lower, the condensed water becomes frost and becomes finned. The condensed water adheres to the surface and adheres to the fin surface without dripping, and the frost grows gradually, which may block the fins. The end of the cut-and-raised piece with a high heat transfer rate is prone to frost, and the frost grows abruptly. Therefore, the number of the cut-and-raised pieces 111 cannot be increased, and the performance improvement of the heat exchanger is suppressed. End up.

  Furthermore, when the cut-and-raised pieces are arranged uniformly, frost tends to adhere on the windward side, which is the gas inflow side of the heat exchanger, due to the large amount of moisture in the gas, and is concentrated on the cut-and-raised pieces on the windward side. Since frost adheres to the surface, the problem is that the gap between the fins is closed in a short time.

  The present invention solves the above-mentioned conventional problems, and provides a heat exchanger that improves heat transfer performance and improves heat exchange performance while suppressing increase in ventilation resistance when gas passes through the heat exchanger. The purpose is to do.

In order to solve the above-mentioned conventional problems, the heat exchanger of the present invention has a fin-shaped surface in which a bent or curved cut is provided in a fin and a straight line connecting both ends of the cut is used as a basic line, and the fin is bent at the basic line. A cut-and-raised piece that is raised substantially vertically is provided, and the angle between the basic line and the main flow direction of the gas has an inclination and is arranged at 35 degrees or less. Further, the number of cut and raised pieces provided on the leeward side from which the gas flows out is more than the number of cut and raised pieces provided on the leeward side from which the gas flows in the center of the heat transfer tube. Furthermore, the number of cut and raised pieces is increased as the distance from the heat transfer tube increases. Further, the fin is provided with a notch obtained by cutting one side of the quadrilateral while leaving one side of the quadrilateral as a basic line, and is bent along the basic line to form a rising piece that is raised substantially perpendicular to the fin surface. The height of the rising piece is set so as to be higher than the height of the fin collar, and the predetermined interval when the fins are stacked is defined. Furthermore, the plane of the rising piece has an inclination with respect to the main flow direction of the gas and forms an angle of 35 degrees or less.

  The heat exchanger according to the present invention has a cut or raised piece provided with a bent or curved cut in the fin, a straight line connecting both ends of the cut as a basic line, bent at the basic line and raised substantially perpendicular to the fin surface The angle formed by the basic line and the main flow direction of the gas has an inclination and is arranged at 35 degrees or less. With this configuration, the heat transfer coefficient can be improved at the tip of the vertically raised piece, and the basic line and the main flow direction of the gas and the inclination should be inclined and the angle formed should be 35 degrees or less. Thus, the turbulent flow in the wake area of the cut and raised piece can be suppressed, and thereby the increase in ventilation resistance can be suppressed. Therefore, even if a large number of cut and raised pieces on the fin surface are provided, an increase in ventilation resistance can be suppressed and a heat transfer rate can be improved.

  In addition, the number of cut and raised pieces provided on the leeward side from which gas flows out relative to the center of the heat transfer tube is greater than the number of cut and raised pieces provided on the leeward side from which gas flows in, so that the inside of the heat transfer tube is When the temperature of the flowing refrigerant is 0 degrees or less, the water droplets attached to the fins become frost and freeze on the fin surface, but some of the moisture in the gas adheres on the windward side, and the gas with reduced moisture is leeward By flowing to the side, moisture, that is, frost attached to the leeward cut and raised is reduced. On the leeward side, the cut-and-raised pieces are arranged sparsely to secure a flow path that passes between the fins even if a lot of frost adheres to the cut-and-raised pieces. Since there is little moisture inside, the growth of frost can be suppressed. Thereby, it is possible to maintain a long time until the gap between the fins is blocked by frost.

  Furthermore, the number of cut and raised pieces is increased as the distance from the heat transfer tube increases. Since heat transfer due to heat conduction decreases as the distance from the heat transfer tube increases, the temperature of the refrigerant flowing in the heat transfer tube is less than 0 degrees by providing a large number of cut and raised pieces away from the heat transfer tube The amount attached to the cut and raised pieces can be suppressed, and the blockage between the fins due to frost can be suppressed.

  In addition, the fin is provided with a notch obtained by cutting one side of the quadrilateral, and the remaining one is defined as a basic line, and is bent at the basic line to form a rising piece that rises substantially perpendicular to the fin surface. The rising piece is configured to be higher than the height of the fin collar so as to define a predetermined interval when the fins are stacked. The fin collar is formed by pressing ironing, but as the height increases, the fin collar becomes thinner, causing cracks at the tip or uneven height. Trouble occurs. In the structure of this invention, the space | interval between fins can be enlarged by restrict | limiting the space | interval between fins with a starting piece. Thereby, when the temperature of the refrigerant flowing in the heat transfer tube is 0 ° C. or less, a rapid increase in ventilation resistance can be suppressed even if frost adheres to the fin surface or the rising piece.

  Furthermore, the plane of the rising piece has an inclination with respect to the main flow direction of the gas and forms an angle of 35 degrees or less. With this configuration, condensed water does not stay on the rising piece, and even if it adheres, it quickly drops and drains, and the ventilation resistance does not increase abnormally.

In the first invention, a bent or curved cut is provided in the fin, and a straight line connecting both ends of the cut is used as a basic line, and a cut-and-raised piece that is bent at the basic line and rises substantially perpendicular to the fin surface is provided. The basic line and the main flow direction of the gas are inclined, and the angle between them is arranged at 35 degrees or less. With this configuration, the heat transfer coefficient can be improved at the tip of the vertically raised piece, and the angle between the basic line and the gas main flow direction is set to 35 degrees or less, thereby Turbulent flow in the wake area can be suppressed, and thereby increase in ventilation resistance can be suppressed. Therefore, even if a large number of cut and raised pieces are provided, an increase in ventilation resistance can be suppressed, and an improvement in heat transfer coefficient can be achieved.

  2nd invention arrange | positions more than the number of the cut-and-raised piece provided in the leeward side where gas flows out with respect to the center of a heat exchanger tube from the number of the cut-and-raised piece provided in the leeward side where gas flows in, When the heat exchanger is used as an evaporator, water drops adhering to the fin become frost and freeze on the fin surface especially when the temperature of the refrigerant flowing in the heat transfer tube is 0 degrees or less. After some of the water has condensed on the fin surface, the gas with less water flows to the leeward side, so there is less moisture or frost adhering to the cut and raised pieces on the leeward side, and there are more cut and raised pieces on the leeward side. Can also suppress the growth of frost. Thereby, it is possible to maintain a long time until the gap between the fins is blocked with frost. Further, by arranging a large number of cuts and raisings on the leeward side, the heat exchange performance can be improved without closing the gaps between the fins in a short time.

  In the third invention, the number of cut and raised pieces is increased as the distance from the heat transfer tube increases. Since heat transfer due to heat conduction decreases as the distance from the heat transfer tube increases, the temperature of the refrigerant flowing in the heat transfer tube is less than 0 degrees by providing a large number of cut and raised pieces away from the heat transfer tube In addition, the amount attached to the cut and raised pieces can be suppressed, and the blockage between the fins due to frost can be suppressed.

  According to a fourth aspect of the present invention, a notch is formed by cutting one side of the quadrilateral into the fin, and forming a rising piece that is raised substantially perpendicular to the fin surface by bending the remaining one side as a basic line along the basic line. Then, the height of the rising piece is set higher than the height of the fin collar so as to define a predetermined interval when the fins are stacked. The fin collar is formed by pressing ironing, but as the height increases, the fin collar becomes thinner, cracks at the tip, and uneven height, etc. Trouble occurs when doing so. In the configuration of the present invention, the spacing between the fins can be increased by regulating the spacing between the fins with the rising pieces. Thereby, when the temperature of the refrigerant flowing in the heat transfer tube is 0 degrees or less, even if frost adheres to the fin surface or the rising piece, the time until the fins are blocked by the frost can be lengthened, A rapid increase in ventilation resistance can be suppressed.

  In the fifth invention, the plane of the rising piece is inclined with respect to the main flow direction of the gas, and the angle is formed to an angle of 35 degrees or less. With this configuration, condensed water does not stay on the rising piece, and even if it adheres, it quickly drops and drains, and the ventilation resistance does not increase abnormally.

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

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. 1 to 3 show the first shape of the first embodiment, FIGS. 4 and 5 show the second shape of the first embodiment, and FIGS. 6 and 7 show the third shape of the first embodiment.

First, the 1st shape of Embodiment 1 is demonstrated according to FIGS. 1-3. 1 is a front view of a fin having a first shape, FIG. 2 is a bottom view thereof, and FIG. 3 is a perspective view thereof. 1 to 3, in the vicinity of the fin collar 13, a cut and raised piece 11 a is formed on the upstream side of the air flow 1 with respect to the longitudinal center line 13 a in the step direction, and a cut and raised piece 11 b is formed on the downstream side of the fin collar 13. It is provided above and below. On the surface of the fin 10 in the vicinity of each of the fin collars 13 provided in a plurality of stages, a triangle 2
Bending cuts 15a and 15b with cuts on the sides are provided, and a straight line connecting both ends of one end 12a and the other end 12b of the upstream cut 15a of the airflow 1 is defined as a basic line 16a. A cut-and-raised piece 11a which is bent and raised perpendicularly to the fin surface is provided, and a straight line connecting both ends of one end 12c and the other end 12d of the cut 15b on the downstream side of the airflow 1 is defined as a basic line 16b. A cut-and-raised piece 11b which is bent at the line 16b and rises perpendicularly to the fin surface is provided.

  The basic line 16a is arranged such that the angle βa between the main flow direction 1a of the gas and the main flow direction 1a is 35 degrees or less, and the inclination direction of the basic line 16a is inclined in a direction in which the main flow 1 is guided toward the fin collar 13. ing. In other words, the inclination direction of the basic line 16a is inclined in the direction of guiding the main stream 1 toward the lateral center line 13b orthogonal to the longitudinal center line 13a of the fin collar 13. Similarly to the basic line 16a, the basic line 16b is arranged such that the angle βb formed with the main flow direction 1b of the gas main flow 1 is 35 degrees or less, and the inclination direction of the basic line 16b is the direction of the horizontal center line 13b. It is inclined in the direction of guiding the main stream 1 to.

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

  In the present embodiment, the heat transfer coefficient can be improved by the boundary layer leading edge effect at the front ends of the cut and raised pieces 11a and 11b that are vertically raised, and further, the portions of the cuts 15a and 15b on the surface of the fin 10 However, the effect of the boundary layer leading edge effect can improve the heat transfer coefficient and improve the heat exchange performance. Further, by arranging the angles βa and βb formed by the basic lines 16a and 16b and the main flow direction 1a of the gas main flow 1 to be 35 degrees or less, turbulence in the wake of the cut and raised pieces 11a and 11b is suppressed. This can suppress an increase in ventilation resistance. Thereby, even if it provides many cut-and-raised pieces, while being able to suppress the increase in ventilation resistance, the improvement of a heat transfer rate can be aimed at.

  In addition to the first shape described above, various polygonal bent shapes, circular arcs, free curved shapes, and the like are conceivable as the cut shape, but as an example, the following second shape and second shape 2 Indicates one.

  FIG. 4 is a front view of the second shape of the first embodiment, and FIG. 5 is a bottom view thereof. 4 and 5, the surface of the fin 20 is provided with bent cuts 25a and 25b with cuts on four sides of a pentagon, and a straight line connecting both ends of one end 22a and the other end 22b of the cut 25a. Is a basic line 26a, and a straight line connecting both ends of one end 22c and the other end 22d of the cut 25b is defined as a basic line 26b. 21a, a cut-and-raised piece 21b which is bent at the basic line 26b and rises perpendicularly to the fin surface is provided. The basic line 26a is arranged such that the angle βa formed by the main flow direction 1a of the gas main flow 1 is 35 degrees or less, and the inclination direction of the basic line 26a is the direction in which the main flow 1 leads toward the fin collar 23, in other words. The fin collar 23 is inclined in a direction leading the main stream 1 toward the lateral center line 23b orthogonal to the longitudinal center line 23a. Similarly to the basic line 26a, the basic line 26b is arranged such that the angle βb formed with the main flow direction 1b of the gas main flow 1 is 35 degrees or less, and the inclination direction of the basic line 26b is the direction of the horizontal center line 23b. It is inclined in the direction of guiding the main stream 1 to.

Furthermore, FIG. 6 shows a front view of the third shape of the first embodiment, and FIG. 7 shows a bottom view thereof. 6 and 7, arc-shaped cuts 35a and 35b are provided on the surface of the fin 30, a straight line connecting both ends 32a and 32b of the cut 35a is a basic line 36a, and one end 32c and the other end of the cut 35b. A straight line connecting the part 32d is a basic line 36b, a cut and raised piece 31a that is bent at the basic line 36a and raised vertically to the surface of the fin 30, and a cut that is bent at the basic line 36b and raised vertically to the surface of the fin 30 A raising piece 31b is provided. The basic line 36a is arranged such that the angle βa between the main flow direction 1a of the gas and the main flow direction 1a is 35 degrees or less, and the inclination direction of the basic line 36a is the direction in which the main flow 1 leads toward the fin collar 33, in other words. The fin collar 33 is inclined in the direction of guiding the main flow 1 toward the lateral center line 33b orthogonal to the longitudinal center line 33a. Similarly to the basic line 36a, the basic line 36b is arranged such that the angle βb formed with the main flow direction 1b of the gas main flow 1 is 35 degrees or less, and the inclination direction of the basic line 36b is the direction of the horizontal center line 33b. It is inclined in the direction of guiding the main stream 1 to.

  About operation | movement and an effect | action about said 2 shape, it has an operation | movement and an effect | action equivalent to the 1st shape of Embodiment 1, and abbreviate | omits description especially.

  As for the shape of the cut, in addition to those described above, the same effect can be obtained if the arc shape is an elliptical shape, a combination of an arc and a bend, or a combination of a curve and a straight line. Further, the plurality of cut and raised pieces may have different sizes and shapes, or may have different angles with the main stream of the airflow.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the effect of the operation and action of the first embodiment is further effectively utilized by increasing the number of cut and raised pieces and optimally arranging them. The explanation of one cut and raised piece is as follows. Since the operation is the same as that of the first embodiment, the description is omitted.

  FIG. 8 is a front view of the fin according to the second embodiment, and FIG. 9 is a bottom view thereof. 8 and 9, the fin surface region between the two fin collars 43 is divided horizontally into a horizontal center line 50 a in the horizontal direction of the fin collar 43 and an intermediate line 50 c that equally divides between the fin collars 43. The area is divided by a dividing line 50b that equally divides the center line 50a and the intermediate line 50c into two, and is divided into an area A near the fin collar 43 and an area B far from the fin collar. On the surface of the fin 40, a cut-and-raised piece 41 (41a, 41b, 41c, 41d, 41e, 41f, 41g, 41h, 41h, 41h, 41h, 41h, 41h, 41h, 41b, 41h, 41h, 41h, 41h, 41h, 41h, 41h, 41h, 41h 41i). The cut and raised pieces 41 are arranged on the surface of the fin 40 with the intermediate line 50 c being line symmetric. A cut-and-raised piece 41 that is not line-symmetric from another configuration is denoted by reference numeral 41j. Each of the cut and raised pieces 41 is inclined in the direction of guiding the main flow 1 toward the lateral center line of the fin collar 43.

  The operation and operation of the heat exchanger configured as described above will be described below. However, the effect of the cut and raised piece described in the first embodiment has the same effect, and the description thereof is omitted. Further, the description will mainly describe the elements arranged in the areas A and B, and the cut and raised pieces 41 symmetrical to the intermediate line 50c have the same effect, and the description thereof will be omitted.

  In the present embodiment, with respect to the vertical center line 51 in the vertical direction in the drawing of the fin collar 43, three cut-and-raised pieces 41a, 41b, 41c are provided on the windward side where gas flows, and one is provided on the vertical center line 51. A cut and raised piece 41d and five cut and raised pieces 41e, 41f, 41g, 41h, and 41i are arranged on the leeward side. When the temperature of the refrigerant that is inserted into the fin collar 43 and flows through the heat transfer tubes 44 that are in close contact with the fin collar 43 is 0 ° C. or less, moisture in the airflow condenses on the surface of the fin 40 and becomes frost on the surface of the fin 40. However, the frost is a portion having a high heat transfer rate, and is particularly concentrated on the cut and raised piece 41 portion. By reducing the number of cut and raised pieces 41 on the windward side, a part of the moisture in the airflow is condensed on the surface of the fin 40 on the windward side, so that the amount of water in the airflow on the leeward side decreases and adheres on the leeward side. The amount of frost to be reduced is also reduced. In this way, the cut and raised piece 41 having a high heat transfer rate is reduced on the windward side from the leeward side, so that on the windward side where the amount of moisture contained in the airflow is large, the number of cut and raised pieces 41 to which frost easily adheres is small. On the leeward side where the amount of water contained in the airflow is reduced, the amount of frost that adheres to the surface of the fins 40 can be evenly adhered by providing a large number of cut and raised pieces 41 having a high heat transfer coefficient. The increase in ventilation resistance when passing between the fins 40 that have been made can be suppressed, and the decrease in capacity due to a decrease in the air volume can be suppressed.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. The third embodiment has the same effect as the operation and action of the first embodiment and the second embodiment. By further optimizing the arrangement of the cut and raised pieces, the cut and raised pieces are effectively used. The operation similar to that of the first embodiment and the second embodiment is omitted.

  8 and 9, cut and raised pieces 41a and 41g near the lateral center line 50a of the fin collar 43, 41c, 41e and 41h are arranged at the next closest positions, and 41b, 41d, 41f and 41i are arranged at the separated positions.

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

  The heat transfer tube 44 is inserted into the fin collar 43 and fixed in close contact therewith. The difference between the temperature of the refrigerant flowing in the heat transfer tube 44 and the temperature of the fin increases as the distance from the heat transfer tube 44 increases, and conversely, the temperature difference between the temperature of the fin 40 and air decreases. The exchange amount becomes smaller. That is, as the distance from the fin collar 43 increases, the surface temperature of the fin 40 becomes closer to the air temperature and the temperature difference becomes smaller, so that the local heat exchange capability becomes smaller. Here, when the heat exchanger is used as an evaporator and the temperature of the refrigerant flowing in the heat transfer tube 44 is 0 ° C. or less, the cut and raised pieces 41a and 41g close to the fin collar 43 have a low temperature and a large heat exchange amount. Therefore, the amount of frost attached is also large. On the other hand, the temperature of the cut and raised pieces 41b, 41d, 41f, and 41i that are separated from the fin collar 43 is increased, the difference from the air temperature is reduced, the amount of heat exchange is small, and the amount of frost is reduced. . Thus, by increasing the number of the cut and raised pieces 41 as the distance from the fin collar 43 increases, the heat exchange performance can be enhanced and a rapid increase in ventilation resistance due to frost adhesion can be suppressed, and the heat exchange capability can be enhanced.

  In FIG. 8, the cut-and-raised pieces 41b, 41d, 41f, and 41i are arranged in the same straight line in the same direction as the main stream 1 of the airflow, but at least in a zigzag shape that does not overlap with the cut-and-raised pieces immediately behind. By arranging, it is possible to achieve higher performance without being buried in the boundary layer generated by the cut-and-raised piece on the windward side.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIGS. The fourth embodiment has the same effect as the operation and action of the first to third embodiments. By providing a rising piece, the space between the fins is widened, so that the heat exchanger is When used as an evaporator and the temperature of the refrigerant flowing in the heat transfer tube is 0 ° C. or less, it is possible to suppress a rapid increase in ventilation resistance due to frost adhesion.

  In FIGS. 8 and 9, incisions 48a and 48b are provided in the vicinity of the fin collar 43, leaving one side of the quadrilateral, and three sides are cut, and the remaining side is bent at the basic lines 49a and 49b as the basic lines 49a and 49b. Thus, rising pieces 47 a and 47 b are formed on the surface of the fin 40 substantially vertically. The heights ha of the rising pieces 47 a and 47 b are formed higher than the height hf of the fin collar 43. Further, the angle βc formed between the basic lines 49a and 49b and the main flow direction 1c of the gas main flow 1 is set to 35 degrees or less, and the inclination directions of the basic lines 49a and 49b are the same as those described in the third embodiment. Similar to the raising piece 41, the main flow 1 is inclined in a direction leading to the lateral center line 50 a of the fin collar 43.

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

The interval between adjacent fins 40 is defined by the height of the fin collar 43 from the height hf.
Since the fin interval is regulated by increasing the height ha of a and 47b, the distance between adjacent fins can be defined depending on the shape of the cuts 48a and 48b, and the fin interval can be increased. Thereby, when the temperature of the refrigerant flowing in the heat transfer tube 44 is 0 degrees or less, even if frost adheres to the surface of the fin 40 or the cut and raised pieces 41a to 41j, the airflow passing between the stacked fins 40 The rapid increase in ventilation resistance can be suppressed.

  Further, the basic lines 49a and 49b of the rising pieces 47a and 47b are inclined with respect to the main flow direction 1c of the gas, and the angle βc is formed at an angle of 35 degrees or less, whereby the rising pieces 47a and 47b are formed. Since the flat surface is not horizontal, condensed water does not stay on the rising pieces 47a and 48b, and even if it adheres, it quickly drops and drains, and the ventilation resistance does not increase abnormally. Further, by setting the angle formed with the main flow direction 1c to be 35 degrees or less, it is possible to suppress the occurrence of turbulent flow in the wake portion of the rising piece 47a, and to suppress increase in ventilation resistance.

  As described above, the heat exchanger according to the present invention is effective when used in a device used as a gas cooler, particularly when the temperature of the refrigerant flowing in the heat transfer tube is 0 ° C. or less, and adheres to the fin surface. Even if the developed frost grows, a rapid increase in ventilation resistance can be suppressed, and a decrease in the amount of air passing through the heat exchanger is suppressed, thereby providing a high heat exchange performance. Therefore, it is used in air conditioners and refrigerators, and transfers heat between a gas such as air that flows between a large number of stacked flat fins and a fluid such as water and refrigerant that flows in the heat transfer tube. It can be widely applied to fin-and-tube heat exchangers.

The front view of the fin of the 1st shape of Embodiment 1 of this invention The bottom view of the 1st shape fin of Embodiment 1 of the present invention The perspective view of the 1st shape fin of Embodiment 1 of this invention Front view of fin of second shape according to embodiment 1 of the present invention The bottom view of the 2nd shape fin of Embodiment 1 of the present invention Front view of third shape fin of embodiment 1 of the present invention The bottom view of the fin of the 3rd shape of Embodiment 1 of the present invention Front view of fins of embodiments 2 to 4 of the present invention The bottom view of the fin of Embodiment 2-4 of this invention Front view of conventional fin Bottom view of conventional fin The perspective view of the fin of a prior art example Fin and tube heat exchanger perspective view

Explanation of symbols

1 Gas main flow 1a, 1b, 1c Gas main flow direction 10, 20, 30, 40 Fins 11a, 11b Cut and raised pieces 21a and 21b Cut and raised pieces 31a and 31b Cut and raised pieces 41, 41a, 41b, 41c, 41d and 41e 41f, 41g, 41h, 41i, 41j Cut and raised pieces 12a, 12c, 22a, 22c, 32a, 32c One end of the cut 12b, 12d, 22b, 22d, 32b, 32d The other end of the cut 13, 23, 33, 43 Fin collar 13a, 23a, 33a Fin collar horizontal center line 13b, 23b, 33b Fin collar vertical center line 15a, 15b, 25a, 25b, 35a, 35b Cut-and-raised cut 16a, 16b, 26a, 26b, 36a , 36b Basic lines of cut and raised pieces 47a, 47b Rising pieces 48a, 48b Incision in flange 49a, 49b Basic line of rising piece 50a Horizontal center line of fin collar 50b Dividing line 50c Intermediate line 51 Vertical center line of fin collar βa, βb Angle between basic line of cut and raised piece and main flow direction βc Cutting Angle between the base line of the wake-up piece and the main flow direction ha Height of the rising piece hf Height of the fin collar

Claims (5)

A plurality of plate-like fins that are stacked in parallel at a constant pitch and through which a gas such as air flows, and inserted into circular through holes provided at a predetermined pitch in the fin, In a fin-and-tube heat exchanger comprising a heat transfer tube through which a fluid such as water or a refrigerant flows, the heat transfer tube being tightly joined to a cylindrical fin collar vertically raised up to the outer periphery of the through hole The fin is provided with a bent or curved cut and a straight line connecting both ends of the cut is used as a basic line, and a cut-and-raised piece that is bent at the basic line and rises substantially perpendicular to the fin surface is provided. The heat exchanger is characterized in that an angle formed between the line and the main flow direction of the gas has an inclination and is arranged at 35 degrees or less. 2. The heat exchanger according to claim 1, wherein the cut-and-raised pieces on the leeward side from which the gas flows out are arranged more than the windward side from which the gas flows into the central axis of the heat transfer tube. The heat exchanger according to claim 1 or 2, wherein the number of cut and raised pieces is increased as the distance from the heat transfer tube increases. The fin is provided with a cut in which three sides are cut, leaving one side of the quadrilateral, and the rising side is bent up at the basic line with the remaining side as a basic line to form a rising piece that is raised substantially perpendicular to the fin surface. The heat exchange according to any one of claims 1 to 3, wherein a piece is higher than a height of a fin collar so as to define a predetermined interval when the fins are stacked. vessel. 5. The heat exchanger according to claim 4, wherein the plane of the rising piece has an inclination with respect to a main flow direction of the gas and is formed at an angle of 35 degrees or less.

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