JP2016121838A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of holding fins with a predetermined interval without providing a spacer formed by folding the surface of the fin.SOLUTION: A heat exchanger has a plurality of flat tubes 20, and a plurality of fins 40 laminated with a predetermined interval. The fin 40 has a cutout part 41 for inserting the flat tube 20, and a cut-and-raised part 42 formed at the end part of the cutout part 41 so as to have a portion having a height at least higher than the half length of a width L1 of the cutout part 41. The predetermined interval is held by the cut-and-raised part 42.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heat exchanger using a flat tube.

  In a heat exchanger having a flat tube and a fin, when a fin collar is formed in the flat tube insertion portion of the fin and the interval between the fins is maintained at a predetermined interval by the fin collar, when the thickness of the flat tube is thin, There is a problem that the width of the fin tube insertion portion becomes narrow, and a fin collar having a height corresponding to the fin interval cannot be formed. As a structure for solving this, Patent Document 1 discloses a heat exchanger in which a surface of a fin is cut and raised to form a spacer, and the space between the fins is held at a predetermined distance by this spacer. .

JP 2012-163318 A

  However, the surface of the fin is a part that exchanges heat with air, and if a structure like a spacer is provided on the surface of the fin as in Patent Document 1, the spacer becomes a ventilation resistance, so the heat exchange efficiency There is a problem that decreases.

  In addition, if spacers are formed on the surface of the fins, it is not possible to provide various cuts and slits for improving the heat transfer performance in the portions where the spacers are provided, so there is a degree of design freedom for improving heat transfer. There is also a problem that it falls.

  Accordingly, the present invention has been made in view of the above-described problems, and is a heat exchanger that can maintain a fin interval at a predetermined interval without providing a spacer that is formed by bending the surface of the fin. The purpose is to provide.

  The present invention has been proposed to achieve the above object.

(1) The heat exchanger of the present invention is a heat exchanger having a plurality of flat tubes and a plurality of fins stacked at a predetermined interval, and the fins are notched portions into which the flat tubes are inserted. And a cut-and-raised portion that is formed along the cut-out portion and has a height that is at least half the length of the width of the cut-out portion, and the predetermined interval is held by the cut-and-raised portion. The

(2) In the configuration of (1), the cut-and-raised portions formed at one end of the notch and the other end facing the one end are alternately formed.

(3) In the configuration of (1) or (2) above, the other end opposite to the cut-and-raised portion provided at one end of the notch is adjacent to the cut-and-raised portion. An appendage section is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the heat exchanger which can hold | maintain the space | interval of a fin at a predetermined space | interval can be provided, without providing the spacer which bends and forms the surface of a fin.

It is a figure at the time of using a heat exchanger for an air conditioner as an example of use of the heat exchanger which concerns on embodiment of this invention. It is a figure which shows the flat tube heat exchanger which is a heat exchanger which concerns on embodiment of this invention, (a) is a top view of a flat tube heat exchanger, (b) is a front view of a flat tube heat exchanger, c) is a side view of flat tube heat exchange, and (d) is a waist side cross-sectional view of the flat tube heat exchanger. It is a waist expansion side view of flat tube heat exchange which is a heat exchanger concerning an embodiment of the present invention. It is a figure for demonstrating the production method of the flat tube heat exchange fin which is a heat exchanger which concerns on embodiment of this invention. It is a figure which shows the state by which the cut-and-raised part was formed in the fin of the flat tube heat exchange which is a heat exchanger which concerns on embodiment of this invention. It is a figure explaining the effect of the cut and raised part of the flat tube heat exchange fin which is a heat exchanger which concerns on embodiment of this invention, (a) is a comparative example, (b) is a figure of this embodiment. . It is a figure for demonstrating the effect of the cut and raised part with the low height of the fin of the flat tube heat exchange which is a heat exchanger which concerns on embodiment of this invention. It is a figure which shows the modification of the raising part of the fin of the flat tube heat exchange which is a heat exchanger which concerns on embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. Note that the same reference numerals are given to the same elements throughout the description of the embodiment.

The heat exchanger which concerns on this invention is a heat exchanger which can be used for a general air conditioner etc. First, an example of the air conditioner using the heat exchanger which concerns on this invention is shown.
Drawing 1 is a figure showing the composition of the air harmony machine using the heat exchanger concerning the embodiment of the present invention.

As shown in FIG. 1, the air conditioner 1 includes an indoor unit 2 and an outdoor unit 3.
The outdoor unit 3 includes a compressor 6, an expansion valve 7, and a four-way valve in addition to the outdoor heat exchanger 5 including a heat exchanger (hereinafter referred to as a flat tube heat exchanger) 10 using a flat tube according to the present invention. 8 is provided, and the indoor unit 2 is provided with an indoor heat exchanger 4 configured using an arbitrary heat exchanger.

At the time of heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 6 of the outdoor unit 3 flows into the indoor heat exchanger 4 of the indoor unit 2 through the four-way valve 8, and air is passed through the indoor heat exchanger 4 (condenser). The refrigerant exchanged with the heat condenses and liquefies.
Thus, the indoor heat exchanger 4 functions as a condenser, and heat is exchanged with the refrigerant in the indoor heat exchanger 4 so that heated indoor air is blown out into the room, whereby the indoor unit 2 is installed. The heating is done.
Thereafter, the high-pressure liquid refrigerant is depressurized by passing through the expansion valve 7 of the outdoor unit 3, becomes a low-temperature low-pressure gas-liquid two-phase refrigerant, and flows into the outdoor heat exchanger 5. The refrigerant that has exchanged heat with the outside air in the outdoor heat exchanger 5 (evaporator) is gasified. Thereafter, the low-pressure gas refrigerant is sucked into the compressor 6 through the four-way valve 8.

During the cooling operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 6 of the outdoor unit 3 flows into the outdoor heat exchanger 5 through the four-way valve 8.
The refrigerant that has exchanged heat with the outside air in the outdoor heat exchanger 5 (condenser) is condensed and liquefied.
Thereafter, the high-pressure liquid refrigerant is decompressed by passing through the expansion valve 7 of the outdoor unit 3, becomes a low-temperature low-pressure gas-liquid two-phase refrigerant, and flows into the indoor heat exchanger 4 of the indoor unit 2.
The refrigerant that exchanges heat with air in the indoor heat exchanger 4 (evaporator) is gasified. Thus, the indoor heat exchanger 4 functions as an evaporator, the indoor heat exchanger 4 exchanges heat with the refrigerant, and the indoor air cooled is blown into the room, whereby the indoor unit 2 is installed. Cooling is performed. Thereafter, the low-pressure gas refrigerant is sucked into the compressor 6 through the four-way valve 8.

  FIG. 2 is a view of a flat tube heat exchanger (outdoor heat exchanger 5) as an example of the heat exchanger according to the present invention, (a) is a plan view of the flat tube heat exchanger, and (b) is a flat plate. (C) is a side view of the flat tube heat exchanger, (d) is a cross-sectional view of the flat tube heat exchanger of FIG. It is an expanded sectional view in cutting line X of a flat tube heat exchanger of).

As shown in FIGS. 2 and 3, the flat tube heat exchanger 10 intersects the flat tubes 20 with a plurality of flat tubes 20 through which refrigerant flows, a pair of headers 30 attached to both ends of the flat tubes 20, and the flat tubes 20. It is a parallel flow type heat exchanger comprising a plurality of fins 40 stacked with a gap for allowing air to pass therethrough.
In addition, the flat tube 20, the header 30, and the fin 40 of this embodiment are formed with aluminum or aluminum alloy.

The flat tube 20 has a flat shape with a cross section extending in the air circulation direction, and a plurality of refrigerant channels 21 arranged in the air circulation direction are formed in the inside thereof in parallel with the air circulation direction.
In addition, although the cross section of the flat tube 20 which has the refrigerant | coolant flow path 21 is shown in FIG. 3, the refrigerant | coolant flow path 21 is abbreviate | omitted and the cross section of the flat tube 20 in another figure is only hatching.

The flat tubes 20 are arranged in parallel vertically at a predetermined interval for air to pass through, and both ends thereof are connected to the pair of headers 30.
For example, in the flat tube heat exchanger 10 shown in FIG. 2 (b), a plurality of flat tubes 20 extending in the left-right direction connect a pair of headers 30.

  The header 30 has a cylindrical shape, in which refrigerant flowing from one connection pipe (not shown) connected to the header 30 is divided into a plurality of flat tubes 20 or from the plurality of flat tubes 20. A refrigerant flow path (not shown) is formed for causing the refrigerant flowing out to join and flow out to the other connection pipe (not shown) connected to the header 30.

That is, the refrigerant flowing into one header 30 is divided into a plurality of flat tubes 20.
Then, the refrigerant flowing into the flat tube 20 flows through the internal refrigerant flow path 21, joins at the other header 30, and flows out.
At this time, in the flat tube 20, heat exchange is performed between the refrigerant flowing through the plurality of flat tubes 20 and the air passing through the gaps between the flat tubes 20.

The fins 40 have a flat plate shape and are arranged in parallel with a gap for air to pass therethrough.
For example, in the flat tube heat exchanger 10 shown in FIG. 2B, a plurality of fins 40 along the vertical direction are arranged with a predetermined gap in the horizontal direction.

  As shown in FIGS. 2D and 3, the fin 40 is unidirectional (here, the windward side in order to insert the flat tube 20 into the end on the windward side. A plurality of notches 41 that are open to the leeward side, and the flat tube 20 is located at the end of the notch 41 that is closer to the flat tube 20 than the dotted line indicating the notches 41. When the flat tube 20 is inserted into these notches 41, the cut and raised portion 42 comes into contact with the flat tube 20, and the flat tube 20 and the raised portion that are in contact with each other. By brazing 42, the fin 40 and the flat tube 20 are joined integrally.

  The heat of the refrigerant flowing through the plurality of flat tubes 20 is transferred from each flat tube 20 to the fins 40, and is transferred to the air passing through the gaps between the fins 40, thereby performing heat exchange.

  Hereinafter, as will be described in detail, a plurality of fins 40 are stacked by the cut and raised portions 42 so as to maintain a predetermined interval.

First, an example of a method for forming the cut-and-raised part 42 along the notch 41 will be described.
FIG. 4 is a diagram showing a state before the cut-and-raised portion 42 is formed on the fin 40.
More specifically, a state in which cutting is performed along a cutting line 42a for forming the cut-and-raised portion 42 in the plate material made of aluminum or aluminum alloy to be the fin 40 is shown. In addition, the surface of this board | plate material is coat | covered with the brazing material.

  Then, as shown by an arrow Y in FIG. 4, the portion that becomes the raised portion 42 is bent so as to rise from the position (dotted line portion) that becomes the notch portion 41, so that the notch portion is shown in FIG. 5. A cut and raised portion 42 is formed along 41.

  As can be seen from the cut line 42a in FIG. 4, a cut-and-raised portion 42 formed at the left end of the cut-out portion 41 and a cut-out portion 41 on the right-hand side of the cut-out portion 41 on the opposite side are formed. The cut-and-raised part 42 is a length L3 that is half the width L1 of the notch 41 when the fin 40 is bent along the insertion direction Z of the flat tube 20 (not shown). Height portions longer than the length L2 are formed alternately.

  Here, when the notch 41 is simply cut along the straight cutting line along the insertion direction Z of the flat tube 20 (not shown) at the center in the width direction of the notch 41 to form the cut-and-raised part 42 ′, The height of the cut-and-raised portion 42 ′ is half of the width L1 of the cut-out portion 41, that is, the cut-and-raised portion 42 ′ having a height of length L2.

  However, as described with reference to FIGS. 4 and 5, the portions where the height L3 of the cut-and-raised portion 42 is longer than the length L2 that is half the width L1 of the notch portion 41 are alternately formed. By doing so, the height of the cut-and-raised part 42 can be earned.

  FIG. 6 shows a cross-sectional view of one flat tube 20 ′ of FIG. 2 (b) when the area A is cut along the flat tube 20 ′, and FIG. 6 (a) is a comparison. As an example, the case where the cut-and-raised part 42 'is formed by cutting the center in the width direction of the above-described notch part 41 along the straight cutting line along the insertion direction Z of the flat tube 20' is shown. FIG. 6B shows the case of the cut-and-raised portion 42 of the present embodiment. More specifically, the cut-and-raised portion 42 has a length L2 that is half the width L1 of the cut-out portion 41. This also shows a case where the portions having the long height L3 are alternately formed.

As can be seen from FIG. 6 (a), the center of the cutout portion 41 in the width direction is cut along a straight cut line along the insertion direction Z of the flat tube 20 'to form a cut-up portion 42'. In this case, the height of the cut-and-raised portion 42 ′ becomes L2 corresponding to half the width L1 of the cut-out portion 41, and the cut-and-raised portion 42 ′ comes into contact with the adjacent fins 40 so that the fins 40 Is held at L2.
That is, the fins 40 are stacked at an interval of a width L2 that is half the width L1 of the notch 41.

On the other hand, in the case of the present embodiment, as shown in FIG. 4, the cut-and-raised portion 42 has a portion having a height (L3) that is longer than the length of the width L2 that is half the width L1 of the notch portion 41 by α. Therefore, as shown in FIG. 6B, the interval at which the cut-and-raised part 42 is held in contact with the adjacent fins 40 is L2 + α (= L3), and is equal to the length of α between the stacked fins 40. You can earn an interval between.
For this reason, even if the width of the flat tube 20 is reduced and the width L1 of the cutout portion 41 is reduced accordingly, the predetermined interval required between the fins 40 can be maintained by the cut-and-raised portion 42. become.

Therefore, as in the prior art, the spacing between the fins 40 can be maintained at a predetermined interval without bending the surface of the fin 40 to form a spacer, so that the airflow resistance such as a spacer on the surface of the fin 40 can be maintained. It is not necessary to provide such a structure, and a decrease in heat exchange efficiency can be suppressed.
Further, since it is not necessary to form a spacer structure on the surface of the fin 40, various cuts and slits for improving the heat transfer performance can be provided, and the degree of freedom in design for improving the heat transfer is reduced. I don't have to.

  By the way, for example, cutting is performed along the cutting line 42a shown in FIG. 7, and the cut-and-raised portion 42 is formed so as to rise from the position (dotted line portion) that becomes the end portion of the cut-out portion 41 by performing press working or the like. By doing so, the height L3 of the cut-and-raised portion 42 can be increased to a height substantially equal to the width L1 of the cut-out portion 41.

Such a cut-and-raised portion 42 may be used, but as can be seen from FIG. 7, when the cut-and-raised portion 42 having a height substantially equal to the width L1 of the cut-out portion 41 is formed, Where the cut-and-raised portion 42L on the left side of the drawing is located, the cut-and-raised portion 42 does not exist at the end portion on the right-hand side of the cut-out portion 41 on the opposite side.
Further, where the cut-and-raised portion 42R on the right end of the notch 41 is located, the cut-and-raised portion 42 does not exist at the end on the left-hand side of the notch 41 opposite to the cut-out 41.

Since the cut-and-raised part 42 is also a part that is brazed between the flat tube 20 by heating after the flat tube 20 (not shown) is inserted into the cut-out part 41, the cut-and-raised part In the part where 42 does not exist, high adhesiveness with the flat tube 20 may not be obtained, and thus heat exchange efficiency may be reduced.
In addition, the integrated strength between the flat tube 20 and the fins 40 may be reduced.

Therefore, as shown in FIG. 4 and FIG. 5, even when the raised portion 42 </ b> L having a high height is formed at the left end of the notched portion 41 in the drawing, the notched portion 41 on the opposite side is illustrated. A small amount of brazing allowance 42F is also present at the right end, and similarly, a cut and raised portion 42R having a high height is formed at the right end of the notch 41 in the figure. It is preferable that the brazing allowance portion 42F is slightly present at the left end of the cutout portion 41 in the figure.
By doing in this way, since the fin 40 can closely_contact | adhere to the perimeter of the flat tube 20, favorable heat exchange efficiency can be obtained and high integrated strength can be obtained.

  The height of the portion to be the brazing allowance portion 42F is not particularly limited, but considering the gain between the fins 40 and the adhesion, 1 of the width L1 of the notch portion 41 It is preferable that the brazing margin 42F has a height selected from a range of / 4 or less.

On the other hand, as shown by a dotted circle B in FIG. 5, the open end side of the cutout portion 41 opens wider than the width L1 of the cutout portion 41 so that the flat tube 20 (not shown). By forming a flat tube insertion guide comprising an inclined portion 43 whose opening width is gradually reduced so that the opening width approaches the width L1 in the insertion direction Z of the fin 40, the fin 40 is formed into a flat tube. The flat tube 20 can be smoothly inserted into the notch 41 during the work of attaching to the notch 20.
Therefore, it is preferable to provide a flat tube insertion guide on the open end side of the notch 41.

(Modification)
In the above-described embodiment, as shown in FIG. 5, as the cut-and-raised portion 42 formed at the end portion of the notch portion 41 of the fin 40, the end portion on one side (left side in the drawing) of the notch portion 41 is illustrated in FIG. As described with reference to FIG. 4, a rectangular raised portion 42L having a height L3 that is longer than a width L2 that is half the width L1 of the notch 41, and a height L4 that is shorter than L2. The cut-and-raised portions 42F having a low height are alternately formed, and the other end (right side in the figure) of the notch 41 is also longer than the width L2 that is half the width L1 of the notch 41. The rectangular high cut-and-raised portions 42R having the height L3 and the cut-and-raised portions 42F having a low height are alternately formed, and the height of the raised portions 42L and 42R is opposite to the height of the raised portions 42L and 42R. In the case of the cut-and-raised part 42 having a shape in which the lower cut-and-raised part 42F is located. Although the shape of the cut and raised portion 42 is not limited to such a shape.

FIG. 8 shows another shape as a modified example of the cut and raised portion 42.
As shown in FIG. 8, the boundary between the raised parts 42L, 42R having a high height and the raised part 42F having a low height does not need to be vertical as shown in FIG. As shown in FIG.

Further, in the example shown in FIG. 5, a plurality of high raised portions 42L are formed at one end (left side in the figure) of the notch 41, and also at the other end (right side in the figure). Although a plurality of high raised portions 42R are formed, as shown in FIG. 8, there may be one high raised portion 42L, 42R.
Of course, in FIG. 8, there is one high raised portion 42L, 42R, but a plurality of similar raised portions 42L, 42R may be provided.

Furthermore, it is not limited to providing the cut-and-raised part 42 having a high height at both ends (left and right end parts) of the notch 41.
As long as the cut-and-raised portion 42 having a high height is formed at least at a part of the peripheral edge of the cut-out portion 41, the cut-and-raised portion 42 having a high height hits the adjacent fin 40. The fins 40 can be held in contact with each other at a predetermined interval.
Accordingly, at least the height of the cut-and-raised portion 42 at the end of the cut-out portion 41, that is, the portion of the cut-and-raised portion 42 having a height longer than the length of the width L 2 that is half the width L 1 of the cut-out portion 41. What is necessary is just to be made to have.

Although the present invention has been described based on the specific embodiments, the present invention is not limited to the above embodiments.
For example, in the above description, when the fin 40 is manufactured, the case where the brazing material provided on the both surfaces of the plate material made of aluminum or aluminum alloy constituting the fin 40 is used is described. There is no need to be limited.

  A plate material made of aluminum or an aluminum alloy constituting the fin 40 is first processed into a state of the fin 40 in which the cut-and-raised portion 42 is formed, and then a brazing material is provided in a portion where the brazing material needs to be provided. You may do it.

Moreover, although the said embodiment demonstrated the case where the flat tube heat exchanger 10 which is a heat exchanger of this invention was used as an indoor heat exchanger, the specific usage form of the heat exchanger which concerns on this invention is arbitrary. Yes, it is not limited to indoor heat exchangers.
Furthermore, in the said embodiment, although shown about the case where there is one flat tube heat exchanger 10 as a heat exchanger of this invention, it is good also as a heat exchanger using multiple flat tube heat exchangers 10. Needless to say.

  As described above, the present invention is not limited to the above-described embodiment, and modifications and improvements may be made as appropriate. The technical scope of the present invention includes such modifications and improvements. It is apparent to those skilled in the art from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 3 Outdoor unit 4 Indoor heat exchanger 5 Outdoor heat exchanger 6 Compressor 7 Expansion valve 8 Four-way valve 10 Flat tube heat exchange 20 Flat tube 21 Refrigerant flow path 30 Header 40 Fin 41 Notch part 42 Cut and raised parts 42L, 42R High raised and raised parts 42F Low raised and raised parts 43 Inclined parts

Claims (3)

A heat exchanger having a plurality of flat tubes and a plurality of fins laminated at predetermined intervals,
The fin has a notch part for inserting the flat tube, and a cut-and-raised part formed along the notch part,
The cut-and-raised part has a portion whose length in the direction perpendicular to the plane of the fin is at least longer than half the width of the notch,
The heat exchanger is characterized in that the predetermined interval is held by the cut and raised portion.   2. The heat exchange according to claim 1, wherein the cut-and-raised portions formed at one end portion of the cutout portion and the other end portion facing the one end portion are alternately formed. vessel. The brazing allowance part adjacent to the cut-and-raised part is provided at the other end that is opposite to the cut-and-raised part provided at one end of the cut-out part. The heat exchanger according to 1 or 2.

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