JP2007017042A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately hold the pitch of fins in a fin-and-tube type heat exchanger comprising a number of sheet-like fins laminated in parallel at a fixed pitch and flat heat transfer tubes inserted substantially at right angles to the fins at a predetermined pitch and enhance falling property of condensed water. <P>SOLUTION: The flat heat transfer tubes 4 are inclined, and cut-up portions opened to the main flow direction of gas with a height equal to the fixed pitch of fins 201 and 20b alternately laminated are provided in an area between heat transfer tubes 4 adjacent in the stage direction of the fins 201a and 201b so as to be located in different positions between the adjacent fins 201 and 201b. Accordingly, the cut-up portions 220a and 220b can easily and accurately hold the fixed pitch of the fins 201a and 201b alternately laminated without being fitted to the fin 201a or fin 201b, and excellent falling property of condensed water adhered to the surface of fins in vaporization can be also ensured. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

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.

  Generally, 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 a constant pitch 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 substantially at right angles, the fluid such as water or refrigerant flows inside, and the outer periphery of the cross section is flat. The heat transfer tube 4 and both ends of the heat transfer tube 4 are connected to each other, and the header 5 that forms a refrigerant flow path together with the heat transfer tube 4 is manufactured.

The fins of the conventional heat exchanger are provided with an inverted trapezoidal rising piece whose tip width is wider than the width of the root of the fin in order to maintain a constant interval between the stacked fins. The fin is provided with a through hole for inserting a heat transfer tube (see, for example, 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 is cut off from the fin except for the root, and is a structure that is simply raised substantially vertically to the fin base, so the rising piece easily falls down, There has been a problem that the original purpose of accurately maintaining a fixed interval between a large number of laminated fins cannot be achieved.

  The present invention solves the above-mentioned conventional problem, and can easily maintain a fixed interval between a plurality of laminated fins easily and can make a close contact between 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 conventional problems, the heat exchanger according to the present invention is configured such that the fins are stacked in a region between the heat transfer tubes adjacent to each other in the direction perpendicular to the gas main flow direction, that is, the step direction, on the surface of the fins. Cuts and raises having a height equal to a constant pitch and opening in the main flow direction of the gas are provided at different positions in the adjacent fins.

  As in the above-described configuration, by providing a cut and raised opening in the main flow direction of the gas at a height equal to a certain pitch at which the fins are stacked, the adjacent fins are provided at different positions, thereby reducing ventilation resistance. The fixed interval of the fins to be stacked can be easily and accurately maintained with little increase.

The present invention is directed to the main flow direction of the gas having a height equal to a certain pitch at which the fins are stacked in a region perpendicular to the main flow direction of the gas, that is, between the adjacent heat transfer tubes, on the surface of the fin. A heat exchanger provided with a cut and raised opening at a position different between adjacent fins is provided. According to this configuration, it is possible to easily and accurately maintain a constant interval between the stacked fins. It can be done and hardly increases the draft resistance.

  According to a first aspect of the present invention, the gas has a height equal to a constant pitch at which the fins are stacked in a region between the heat transfer tubes adjacent to each other in the direction perpendicular to the gas main flow direction, that is, the step direction, on the surface of the fin. The height of the cut and raised is equal to the pitch of the fins to be stacked by providing the cut and raised to open in the main flow direction at different positions between adjacent fins. While being able to hold | maintain correctly correctly, since the said cut-raising opens in the mainstream direction of the said gas, it hardly increases ventilation resistance.

  A second invention is the heat exchanger according to the first invention, wherein the fins are stacked in a region between the heat transfer tubes adjacent to each other in a direction perpendicular to the main flow direction of the gas, that is, in the step direction, on the surface of the fin. Because of a plurality of cuts raised in the direction of the main gas flow at a height of about 1/4 to about 3/4 of a constant pitch, excellent ventilation due to the temperature boundary layer leading edge effect of the multiple cuts Characteristics and heat transfer performance can be obtained.

  According to a third aspect of the present invention, in the heat exchanger according to the second aspect, the width of the cut-and-raised portion having a height of about 1/4 to about 3/4 of the constant pitch of the fins to be stacked is equal to the width of the fin base. Since it is approximately 1/2 to approximately 1/3, the temperature boundary layer of the cut and raised is difficult to be buried in the temperature boundary layer of the wind up and cut immediately before, and further excellent ventilation characteristics and heat transfer performance are obtained. Can do.

  According to a fourth aspect of the present invention, in the heat exchanger according to the first aspect, a ridge line is formed in a step direction in a region between the heat transfer tubes adjacent to the surface of the fin in a direction perpendicular to the main flow direction of the gas, that is, in the step direction. An excellent heat transfer performance can be obtained by providing the undulations in which the extending peaks and valleys are alternately arranged. Further, when the heat exchanger of the fourth invention is used as an outdoor heat exchanger of an air conditioner, frost adheres to the surface of the fins when the outside air becomes low temperature during heating operation, but the temperature boundary layer leading edge effect The frost concentrates and adheres to the leading edge of the cut and raised with good performance, such as cutting and raising to obtain high performance with the above, and the fins clog due to the attached frost, and it is almost impossible to ventilate The problem that the heating performance decreases rapidly is less likely to occur.

  According to a fifth aspect of the present invention, in the heat exchanger according to any one of the first to fourth aspects, when the heat exchanger is used as an evaporator, the main flow direction of the gas, that is, the column direction, Installed perpendicularly to the main flow direction, that is, the step direction is vertical, and the longitudinal direction of the flat heat transfer tube is inclined with respect to the horizontal direction so that it adheres to the surface of the fin and the flat heat transfer tube. It is possible to smoothly drop the condensed water that does not stay.

  According to a sixth aspect of the present invention, in the heat exchanger of the fifth aspect, the flat heat transfer tube is inclined downward in the leeward direction of the gas, so that the fin and the flat heat transfer tube Condensed water adhering to the surface is smoothly dropped to the leeward side by the gas flow and along the flat heat transfer tube having a downward gradient in the gas leeward direction.

  According to a seventh aspect of the present invention, in the heat exchanger of the fifth or sixth aspect, the inclination angle of the flat heat transfer tube with respect to the horizontal direction is about 5 ° to about 30 °. The condensed water adhering to the surfaces of the fins and the flat heat transfer tubes can be dropped smoothly without stagnation.

According to an eighth aspect of the present invention, in the heat exchanger according to any one of the first to seventh aspects, when the fins are stacked, the shape of the adjacent fins is the fin surface without changing one side of the fins. When it is rotated 180 ° while maintaining the same shape, when using the fins of substantially only one shape, when laminating the fins, the adjacent fins alternately,
By rotating 180 ° while maintaining the fin surface, adjacent fins can be used in different shapes.

  According to a ninth invention, in the heat exchanger according to any one of the first to seventh inventions, when the fins are stacked, the shape of the adjacent fins is either one above or below the stepped direction of the fins. When the stage is shifted by one stage, the shape is the same except for the area where either the uppermost stage or the lowermost stage is shifted. Therefore, the fins are stacked substantially using only one type of fin. At this time, the adjacent fins can be used in different shapes by shifting the adjacent fins one step up or down in the fin step direction.

  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.

  In addition, the basic configuration and the basic manufacturing method of the heat exchanger according to the embodiment of the present invention are configured by the multi-layered flat fins and flat heat transfer tubes shown in FIG. 7 described in the prior art. Since it is the same as a general fin-and-tube heat exchanger, the description thereof will be omitted, and the fin shape, the processing of the fins, and the manufacturing method for laminating will be described in detail.

(Embodiment 1)
1 (a) and 1 (b) are front views of fins 101a and 101b adjacent to each other in the heat exchanger according to Embodiment 1 of the present invention, and FIG. 2 is the present invention of FIGS. 1 (a) and 1 (b). FIG. 1A and FIG. 1B are enlarged views of FIGS. 1A and 1B in a state where the fins 101a and the fins 101b of the heat exchanger according to the first embodiment are alternately stacked. It is the expanded side view which looked at the state which laminated | stacked alternately the fin 101a and the fin 101b of the heat exchanger in Embodiment 1 of this invention of b) from the windward side.

  In FIGS. 1A, 1B, 2 and 3, the heat transfer tubes 4 having a flat cross-sectional outer periphery are inserted into the fins 101a and 101b at a predetermined pitch substantially perpendicular to the fins 101a and 101b. A through hole 13 is provided for this purpose. A height equal to a certain fin pitch Pf when the fins 101a and the fins 101b are alternately stacked in a region between the through holes 13 into which the heat transfer tubes 4 adjacent to the gas in the direction perpendicular to the main flow direction, that is, in the step direction, are inserted. Further, the cut-and-raised 120a and the cut-and-raised 120b that are opened in a semicircular shape in the gas main flow direction and are convex on the surface side of the fin 101a and the fin 101b are arranged in the vicinity of the windward leading edge and the windward trailing edge. The cut and raised portion 120a is provided near the lower side in the step direction of the through hole 13 into which the heat transfer tube 4 is inserted, and the cut and raised portion 120b of the fin 101b is provided near the upper side in the step direction of the through hole 13 into which the heat transfer tube 4 is inserted. Yes.

  Further, in the region between the fins 101a and the fins 101b between the through holes 13 into which the heat transfer tubes 4 adjacent in the step direction are inserted, the heat transfer tubes 4 that are open in the gas main flow direction and are adjacent in the step direction are inserted. A plurality of cut and raised portions 17 having a symmetrical shape with respect to the center point of the region between the through holes 13 having a height Hs of about 1/4 to about 3/4 of the constant pitch Pf of the fins to be stacked. The width Ws is approximately 1/2 to approximately 1/3 of the width Wf of the fin base.

  The fin 101a is shaped so as to have the shape of the fin 101b when the fin 101a is rotated 180 ° while maintaining the fin surface without changing the front and back, and the fin 101a and the fin 101b are substantially one type of fin. .

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

As described above, in the present embodiment, first, the fin 101a and the fin 101b are stacked in the region between the through holes 13 into which the heat transfer tubes 4 adjacent in the step direction of the fins 101a and 101b are inserted. By providing the cut-and-raised portions 120a and 120b having a height equal to the constant pitch Pf and opening in the gas main flow direction at different positions in the adjacent fins 101a and 101b, a large number of fins 101a and 101b are stacked alternately. In this case, the cut-and-raised 120a and the cut-and-raised 120b do not fit into the fin 101a or the fin 101b. The raising 120a and the cutting and raising 120b are in the main flow direction of the gas. Since it is open in a circular shape and is not easily deformed, it is possible to easily and accurately maintain a fixed interval between the laminated fins 101a and 101b, and the cut-and-raised 120a and the cut-and-raised 120b are made of gas. Since the opening is in the mainstream direction, the heat transfer performance can be slightly improved by the leading edge effect of the temperature boundary layer without substantially increasing the ventilation resistance.

  Further, in the present embodiment, the fixed surfaces of the fins 101a and fins 101b stacked 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, the step direction, on the surfaces of the fins 101a and 101b. Since the plurality of cuts 17 having a height Hs of about 1/4 to about 3/4 of the pitch Pf and opening in the gas main flow direction are provided, the temperature boundary layer leading edge effect of the plurality of cuts 17 is excellent. Ventilation characteristics and heat transfer performance can be obtained.

  Further, in the present embodiment, the width Ws of the cut-and-raised portion 17 having a height Hs of approximately ¼ to approximately ¾ of the constant pitch Pf of the fins 101a and 101b to be stacked is substantially equal to the width Wf of the fin base. Since it is set to 1/2 to approximately 1/3, the temperature boundary layer of the cut-and-raised 17 is not easily embedded in the temperature boundary layer of the wind-up and raised immediately before it, and further excellent ventilation characteristics and heat transfer performance can be obtained. it can.

  In the present embodiment, when the fins 101a and the fins 101b are alternately stacked, the shapes of the adjacent fins 101a and 101b are rotated by 180 ° while maintaining the fin surface without changing the front and back of the fins. Since the same shape is used, when the fins 101a and the fins 101b are alternately laminated using the fin 101a having only one type of shape, the fin surface is kept every other fin 101a. By rotating 180 degrees, the adjacent ones can be used as fins 101a and 101b having different shapes. Further, since the fins 101a and 101b have substantially the same shape, they can be molded with only one type of mold, and the investment amount and repair cost of the mold can be suppressed, and the productivity is good.

(Embodiment 2)
4 (a) and 4 (b) are front views of the fins 201a and 201b adjacent to each other in the heat exchanger according to Embodiment 2 of the present invention, and FIG. 5 is the present invention of FIGS. 4 (a) and 4 (b). FIG. 4A and FIG. 4B are enlarged views of the cross section taken along the line B-B in FIG. 4A and FIG. 4B in a state where the fins 201a and the fins 201b of the heat exchanger in the second embodiment are alternately stacked. (B) It is the expanded side view which looked at the state which laminated | stacked the fin 201a and the fin 201b of the heat exchanger in Embodiment 2 of this invention alternately from the windward side.

4 (a), 4 (b), 5 and 6, the heat transfer tubes 4 having a flat cross-sectional outer periphery are inserted into the fins 201a and 201b at a predetermined pitch substantially perpendicular to the fins 201a and 201b. For this purpose, a through hole 13 is provided. A height equal to a certain fin pitch Pf when the fins 201a and fins 201b are alternately stacked in a region between the through-holes 13 into which 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, are inserted. Further, the cut-and-raised portion 220a and the cut-and-raised portion 220b, which are opened in a semicircular shape in the gas main flow direction and are convex on the surface side of the fin 201a and the fin 201b,
The cut-and-raised portion 220a of the la 1a is formed in both the vicinity of the upper side and the lower side of the even-numbered through-holes 13 of the through-holes 13 into which the heat transfer tubes 4 are inserted. The raising 220b is provided in the vicinity of the upper side and the lower side of the odd-numbered through holes 13 of the through holes 13 into which the heat transfer tubes 4 are inserted.

  Further, in the region between the through holes 13 into which the heat transfer tubes 4 adjacent to each other in the step direction of the fins 201a and the fins 201b are inserted, the undulating portions 18 in which peaks and valleys in which ridge lines extend in the step direction are alternately arranged. Is provided.

  When the heat exchanger according to Embodiment 2 of the present invention is used as an evaporator, the main flow direction of gas, that is, the column direction is set in the horizontal direction, the perpendicular direction to the main flow direction of gas, that is, the step direction is set in the vertical direction, The through-hole 13 is inclined and provided so that the longitudinal direction of the flat heat transfer tube 4 is inclined downward at an angle θ of about 5 ° to about 30 ° with respect to the horizontal direction. .

  In addition, the fin 201a is formed in the same shape for each region C of two steps of the through hole 13, the undulating portion 18, and the cut and raised 220a, and the fin 201b is also one step in the step direction from the fin 201a. The shapes of the through holes 13 and the undulating portions 18 and the cut and raised portions 220b for each of the two consecutive steps D shifted are formed in the same shape as the through holes 13 and the undulated portions 18 and the cut and raised portions 220a of the fin 201a. Yes.

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

  As described above, in the present embodiment, first, the fin 201a and the fin 201b are laminated in the region between the through holes 13 into which the heat transfer tubes 4 adjacent to each other in the step direction are inserted between the fins 201a and 201b. By providing the cut-and-raised portions 220a and 220b having a height equal to the constant pitch Pf and opening in the gas main flow direction at different positions in the adjacent fins 201a and 201b, the fins 201a and 201b are alternately arranged. When a large number of layers are stacked, the cut-and-raised 220a and the cut-and-raised 220b do not fit into the fin 201a or the fin 201b, and the height of the cut-and-raised 220a and the cut-and-raised 220b is equal to the pitch Pf between the fins 201a and 201b to be stacked. The cut-and-raised 220a and the cut-and-raised 220b are gas mainstreams. Since it is semicircularly open and is not easily deformed, it is possible to easily and accurately maintain a fixed interval between the fins 201a and 201b to be stacked, and to cut and raise the cuts 220a and 220 Since 220b is opened in the gas main flow direction, the heat transfer performance can be slightly improved by the effect of the leading edge of the temperature boundary layer without substantially increasing the ventilation resistance.

  Moreover, in this Embodiment, a ridgeline is extended in the step direction in the area | region between the through-hole 13 into which the heat transfer tube 4 adjacent to the direction orthogonal to a gas main flow direction, ie, a step direction, of the fin 201a and the fin 201b is inserted. An excellent heat transfer performance can be obtained by providing the undulations 18 in which peaks and valleys are alternately arranged. Further, when the heat exchanger of the present embodiment is used as an outdoor heat exchanger of an air conditioner, frost adheres to the surfaces of the fins 201a and the fins 201b when the outside air becomes a low temperature during heating operation. Frost concentrates and adheres to the leading edge of the cut and raised with good performance, such as cutting and raising to obtain high performance with the leading edge effect, and the fins clog due to the attached frost and almost no ventilation is possible The problem is that the heating performance is rapidly lowered and the heating performance is rapidly lowered.

Further, in the present embodiment, when the heat exchanger of the present embodiment is used as an evaporator, the main flow direction of gas, that is, the column direction, is set to the horizontal direction, and the perpendicular direction to the gas main flow direction, that is, the step direction, is set to the vertical direction. The condensed water adhering to the surfaces of the fins 201a and 201b and the flat heat transfer tube 4 by installing and inclining the longitudinal direction of the flat heat transfer tube 4 with respect to the horizontal direction,
It can be dropped smoothly without staying.

  In the present embodiment, the flat heat transfer tube 4 is inclined downward in the gas leeward direction, so the condensed water adhering to the surfaces of the fins 201a and 201b and the flat heat transfer tube 4 is used. Falls smoothly along the flat heat transfer tube 4 having a downward slope toward the leeward side by the gas flow and toward the leeward direction of the gas.

  In the present embodiment, the inclination angle of the flat heat transfer tube 4 with respect to the horizontal direction is set to approximately 5 ° to approximately 30 °, so that the ventilation resistance is not increased so much and the fins 201a and 201b are not increased. And the condensed water adhering to the surface of the flat heat transfer tube 4 can be dropped smoothly without staying.

  In the present embodiment, since the fin 201a is formed by shifting the fin 201a one step up or down in the step direction, the shape of the fin 201b is substantially used. When alternately laminating the fins 201a and the fins 201b, the adjacent fins 201a and fins 201b may be used as the fins 201a and 201b having different shapes by laminating every other fin 201a in the step direction. Can do. Moreover, since the fin 201a and the fin 201b have substantially the same shape, the fin 201a and the fin 201b can be molded with only one type of mold, and the investment amount and repair cost of the mold can be suppressed, and the productivity is good.

  In the first and second embodiments, the cut-and-raised portions 120a, 120b, 220a, and 220b having the same height as the fin pitch Pf have been described as shapes that open in a semicircular shape in the gas main flow direction. Although it is slightly inferior in terms of the strength and effective heat transfer area, even a shape that opens in a trapezoidal shape in the mainstream direction of gas has substantially the same effect.

  As described above, since the heat exchanger according to the present invention can easily and accurately maintain a predetermined interval between a plurality of laminated fins, the heat exchanger is used in an air conditioner, a refrigerator, a refrigerator, and the like. Widely used in fin-and-tube heat exchangers that transfer heat between a gas such as air that flows between stacked flat fins and a fluid such as water or refrigerant that flows in a flat heat transfer tube. Applicable.

(A) Front view of adjacent fins of heat exchanger in embodiment 1 of the present invention (b) Front view of adjacent fins of other heat exchanger 1A and 1B are enlarged views of the AA cross section in FIG. 1 in a state where the two types of fins in FIGS. The enlarged side view which looked at the state which laminated | stacked two types of fin of FIG.1 (a) (b) alternately from upwind (A) Front view of adjacent fins of heat exchanger in embodiment 2 of the present invention (b) Front view of adjacent fins of other heat exchanger 4B is an enlarged view of the BB cross section in FIG. 4 in a state where the two types of fins of FIGS. 4A and 4B are alternately stacked. Enlarged side view of the state in which the two types of fins shown in FIGS. The perspective view which shows the basic composition of the conventional fin and tube heat exchanger

Explanation of symbols

4 Heat transfer tube 13 Through hole 17 Cut and raise height 1/3 to 2/3 of fin pitch 18 Unraveling parts 101a, 101b, 201a, 201b Fin 120a, 120b, 220a, 220b Cut height of fin pitch

Claims (9)

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 are inserted at a predetermined pitch substantially perpendicular to the fins and closely bonded 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, when the heat exchanger is used as an evaporator, the main flow direction of the gas That is, the row direction is set in the horizontal direction, the gas flow direction perpendicular to the gas, that is, the step direction is set in the vertical direction, and the heat transfer tubes are connected to the front edge portion of the fin on the gas windward side and the gas leeward side. A heat exchanger, wherein the fins are inserted in a staggered manner from both sides of the rear edge of the fin in a downward gradient toward the central portion of the fin in the main flow direction. In the region between the heat transfer tubes 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, the height of about 1/4 to about 3/4 of the constant pitch of the fins stacked. The heat exchanger according to claim 1, wherein a plurality of cut-and-raised portions that open in the gas main flow direction are provided. The width of the cut-and-raised portion having a height of about 1/4 to about 3/4 of the fixed pitch of the fins to be stacked is set to about 1/2 to about 1/3 of the width of the fin base. Item 3. The heat exchanger according to Item 2. In the fin surface, in the region between the heat transfer tubes adjacent in the direction perpendicular to the gas main flow direction, that is, in the step direction, undulations in which peaks and valleys in which the ridge lines extend in the step direction are arranged alternately are provided. The heat exchanger according to claim 1. When the heat exchanger is used as an evaporator, the main flow direction of the gas, that is, the column direction is set in the horizontal direction, the perpendicular direction to the main flow direction of the gas, that is, the step direction is set in the vertical direction, and the longitudinal direction of the flat heat transfer tube The heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger is inclined with respect to a horizontal direction. The heat exchanger according to claim 5, wherein the flat heat transfer tube is inclined downward in the leeward direction of the gas. The heat exchanger according to claim 5 or 6, wherein an inclination angle of the flat heat transfer tube with respect to a horizontal direction is set to approximately 5 ° to approximately 30 °. When laminating fins, the shape of adjacent fins becomes the same shape when one side is rotated 180 ° while maintaining the fin surface without changing the front and back sides of the fins. The described heat exchanger. When laminating fins, the shape of adjacent fins is the same except that one of the fins is shifted one step up or down in the step direction of the fin, except for the region where one of the uppermost and lowermost steps is displaced. The heat exchanger according to any one of claims 1 to 7.

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