JP2005337545A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing the pressure loss of the flow of an air passing the heat exchanger while increasing a heat transfer area. <P>SOLUTION: This heat exchanger for performing heat exchange between the air and a refrigerant comprises a plurality of heat exchange sheets 46. The heat exchange sheets 46 are formed by crossing and integrating a plurality of hollow thin tubes 50 allowing the refrigerant to flow therein with a plurality of thin line members 60. The adjacent heat exchange sheets 46 are disposed so as to be overlapped with each other in a thickness direction, and tilted in the thickness direction relative to the flowing direction of the air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger provided with a sheet-like heat exchange part.

Conventionally, fin-and-tube metal heat exchangers using copper tubes, aluminum fins, and the like have been widely used in air conditioners.
As an alternative to such a heat exchanger, Patent Document 1 discloses a heat exchanger having a knitted body (heat exchanging portion) formed by weaving a plurality of hollow fibers having a small diameter. Here, while circulating the refrigerant in the hollow fiber of the knitted body, air is passed through the knitted body of the knitted body so that heat exchange is performed between the refrigerant and the air.
JP-A-3-67994

In the heat exchanger having the knitted body of Patent Document 1, since the knitted body can be bent relatively freely, it is designed as compared with a fin-and-tube type heat exchanger widely used in air conditioners. There are advantageous effects such as an improved degree of freedom.
When using a heat exchanger composed of such a knitted body, if it is considered to secure a sufficient heat transfer area, a method of increasing the narrow tube diameter and reducing the narrow tube pitch, A method of arranging in the direction (that is, arranging in the air flow direction) can be considered.

  However, whether the former method or the latter method is used, the pressure loss increases in the air flow passing through the heat exchanger, and the capacity of the blower or the like that generates the air flow is increased. There is a demerit that it must be. For this reason, when the cross-sectional area of an air flow path cannot be enlarged so much, it becomes difficult in terms of cost to secure a heat transfer area of the heat exchanger and obtain a necessary heat exchange amount.

  The subject of this invention is providing the heat exchanger which can suppress the pressure loss of the flow of the air (target fluid) passing through a heat exchanger small, enlarging a heat-transfer area.

  The heat exchanger according to the first aspect of the present invention is a heat exchanger that exchanges heat between the target fluid and the heat medium, and includes a plurality of sheet-like heat exchange units. Each heat exchanging unit is formed by integrating a plurality of hollow thin tubes through which the heat medium passes, or a plurality of hollow thin tubes through which the heat medium passes and a plurality of thin wire members intersect. Are integrated. And in this heat exchanger, it arrange | positions so that the adjacent heat exchange part may overlap in the thickness direction, and the thickness direction of a heat exchange part has an inclination with respect to the flow direction of object fluid. It is to be noted that adjacent heat exchange portions are arranged so as to overlap in the thickness direction means that each heat exchange portion is arranged so that a gap in the thickness direction is formed between the sheet-like heat exchange portions. In addition, a state in which the heat exchanging part and the heat exchanging part are arranged so as to be in contact with each other is also included.

  Here, the plurality of sheet-like heat exchange parts including the thin tubes are arranged so as to overlap in the thickness direction, and are arranged so that the thickness direction and the flow direction of the target fluid have an inclination. That is, the surface of the sheet-like heat exchange part is not in a state perpendicular to the flow direction of the target fluid, but is inclined with respect to a plane perpendicular to the flow direction of the target fluid. For this reason, compared with the case where a plurality of sheet-like heat exchange parts are arranged in parallel on a surface perpendicular to the flow direction of the target fluid, the target fluid passes through the plurality of heat exchange parts while ensuring a large heat transfer area. The pressure loss can be reduced.

The heat exchanger according to the second invention is the heat exchanger according to the first invention, wherein the outer diameter of the thin tube of the heat exchange section is 1 mm or less.
Here, since the outer diameter of the thin tube is 1 mm or less, the high flexibility of each heat exchange part can be maintained, and the degree of freedom of design in an apparatus such as an air conditioner to which the heat exchanger is applied can be improved. It is easy to absorb manufacturing errors of the heat exchanger.

In addition, although it is necessary to consider shaping | molding about the outer diameter of a thin tube, the smaller one is desirable and it is further desirable to make it smaller to 0.5 mm or less.
The heat exchanger according to the third invention is the heat exchanger according to the first invention or the second invention, wherein a gap between adjacent thin tubes of the heat exchange section is 3 mm or less.
Here, since the gap between adjacent thin tubes of the heat exchanging section is 3 mm or less, the amount of the target fluid that passes through the heat exchanging section with little heat exchange can be suppressed.

Although it depends on the outer diameter of the narrow tube, it is desirable that the gap between adjacent thin tubes is further reduced to 2 mm or less.
A heat exchanger according to a fourth aspect of the present invention is the heat exchanger according to any one of the first to third aspects, wherein each heat exchange section is folded so as to have a plurality of folds. Moreover, the thickness direction of at least one part of each heat exchange part has an inclination with respect to the flow direction of object fluid.

  Here, by folding each heat exchanging section, at least a part of the heat exchanging section is inclined with respect to the flow direction of the target fluid, and the flow direction of the target fluid is set while completely closing the flow path of the target fluid. It is easy to make the thickness direction of the heat exchange part have an inclination. In addition, since the heat exchange part is folded so as to have multiple creases, the heat transfer area is greatly increased compared to a structure in which the heat exchange part is slightly tilted with respect to a plane perpendicular to the flow direction of the target fluid. The heat exchange amount of the heat exchanger can be dramatically increased.

A heat exchanger according to a fifth aspect is the heat exchanger according to the fourth aspect, wherein each heat exchanging part has a surface area larger than the cross-sectional area of the flow path through which the target fluid flows.
Here, by folding each heat exchange part, the surface area of each sheet-like heat exchange part is made larger than the cross-sectional area of the flow path of the target fluid. For this reason, the heat transfer area as a whole heat exchanger becomes very large, and the heat exchange amount of the heat exchanger can be dramatically increased while suppressing the pressure loss of the flow of the target fluid.

The heat exchanger according to a sixth aspect of the present invention is the heat exchanger according to the fourth or fifth aspect of the present invention, wherein the heat exchange part is folded at 20 ° or less at the fold.
Here, the heat exchange part is folded at a considerably acute angle, and a heat transfer area of the heat exchange part that is considerably larger than the cross-sectional area of the flow path of the target fluid can be secured.
A heat exchanger according to a seventh aspect of the present invention is the heat exchanger according to any one of the fourth to sixth aspects, wherein the heat exchange unit includes a plurality of hollow thin tubes and a plurality of thin wire members through which the heat medium passes. Are integrated so that the thin wire member is bent rather than the thin tube.

Here, since the heat exchange part is folded by folding the thin wire member instead of the thin tube, the thin tube has no bent portion and the flow of the heat medium through the thin tube even when the diameter of the thin tube is very small. Is less likely to be inhibited.
A heat exchanger according to an eighth aspect of the present invention is the heat exchanger according to any one of the first to third aspects of the present invention, wherein the plurality of heat exchange portions are spaced in a direction intersecting the flow direction of the target fluid. Are lined up.

  Here, since there is a gap between the heat exchange parts, the gas flows from the upstream side to the downstream side of the heat exchanger without passing between the narrow tubes of any heat exchange part through the gap. There is a risk that the target fluid will end up. However, since the pressure loss of the flow of the target fluid can be reduced by providing a gap between the heat exchange parts, a plurality of sheet-like heat exchange parts can be arranged at an incline or the surface area of each heat exchange part can be increased. If the expansion of the heat transfer area by increasing the size and the size of the gap are balanced, a heat exchange amount of a predetermined heat exchanger can be secured.

A heat exchanger according to a ninth aspect is the heat exchanger according to the eighth aspect, wherein the thickness direction of the heat exchanging portion has an inclination of 90 ° with respect to the flow direction of the target fluid.
Here, the surface of the sheet-like heat exchanging portion is shaped along the flow direction of the target fluid. Therefore, in a configuration in which a gap exists between the heat exchange units, there is no obstacle in the flow of the target fluid in the gap, and the pressure loss of the flow of the target fluid passing through the heat exchanger can be easily suppressed. On the other hand, the target fluid that flows to the downstream side of the heat exchanger without heat exchange in the heat exchange section is likely to be generated, but by adjusting the gap size and the area of the heat exchange section appropriately, the heat exchanger The heat exchange amount in the heat exchanger can be ensured by a predetermined amount while suppressing the pressure loss of the flow of the target fluid in.

  A heat exchanger according to a tenth aspect of the present invention is the heat exchanger according to the eighth aspect of the present invention, wherein the plurality of heat exchange parts are divided into a first heat exchange part group and a second heat exchange part group. Further, in each of the first heat exchange part group and the second heat exchange part group, the plurality of heat exchange parts are arranged in a direction intersecting the flow direction of the target fluid with a gap. The second heat exchange unit group is arranged on the downstream side in the flow direction of the target fluid with respect to the first heat exchange unit group. And the inclination with respect to the flow direction of the target fluid in the thickness direction of the heat exchange section in the heat exchanger of the first heat exchange section group, and the target fluid in the thickness direction of the heat exchange section in the heat exchanger of the second heat exchange section group The inclination with respect to the flow direction is different.

Here, the first heat exchange unit group and the second heat exchange unit group arranged in the flow direction of the target fluid have different heat exchange unit inclinations with respect to the flow direction of the target fluid. By adjusting the inclination of the heat exchange portions of these groups, the heat exchange amount of the heat exchanger and the pressure loss amount of the target fluid in the heat exchanger can be changed.
A heat exchanger according to an eleventh aspect of the present invention is the heat exchanger according to any one of the first to tenth aspects of the present invention, wherein the heat exchanging section is made by weaving intersecting narrow tubes, or intersecting narrow tubes and thin wire members. And weaving. The heat exchange part has a predetermined thickness.

Here, the heat exchange part is woven with a predetermined thickness and tends to cause a large pressure loss when the target fluid passes through, so that the thickness direction and the flow direction of the target fluid have an inclination. Since the heat exchange part is arranged, the pressure loss of the target fluid passing through the heat exchanger can be suppressed to a small value.
A heat exchanger according to a twelfth aspect of the present invention is the heat exchanger of the eleventh aspect of the present invention, wherein the thickness of the heat exchanging portion is such that the target fluid can pass through in the thickness direction even when overlapped with other heat exchanging portions. It is thick.

  If the woven sheet-like heat exchange parts are stacked without any gaps, the weave of one heat exchange part will be clogged with thin tubes of other heat exchange parts, and the pressure loss of the target fluid passing through the heat exchanger will become extremely large. There is a risk that. In view of this, here, by devising a weaving method or providing a spacer in the heat exchange part, the thickness of the heat exchange part can be increased in the thickness direction even when it is overlapped with another heat exchange part. Thick enough to pass through. Thereby, even when a plurality of heat exchanging portions are overlapped with no gap, the pressure loss of the target fluid passing through the heat exchanger can be suppressed to a relatively small value.

In the heat exchanger according to the first aspect of the present invention, a plurality of target fluids can be obtained while ensuring a large heat transfer area as compared to a case where a plurality of sheet-like heat exchange parts are arranged in parallel on a surface perpendicular to the flow direction of the target fluid. The pressure loss when passing through the heat exchange section can be kept small.
In the heat exchanger according to the second invention, the high flexibility of each heat exchange part can be maintained, and the degree of freedom of design in an apparatus such as an air conditioner to which the heat exchanger is applied can be improved. It is easy to absorb manufacturing errors.

In the heat exchanger according to the third aspect of the present invention, the amount of the target fluid that passes through the heat exchanging portion without performing heat exchange can be kept small.
In the heat exchanger according to the fourth aspect of the present invention, it is easy to make the flow direction of the target fluid and the thickness direction of the heat exchange portion have an inclination while completely closing the flow path of the target fluid. In addition, it is easy to greatly increase the heat transfer area as compared to a structure in which the heat exchanging portion is slightly inclined with respect to a plane perpendicular to the flow direction of the target fluid.

In the heat exchanger according to the fifth invention, the heat transfer area as a whole heat exchanger becomes very large, and the heat exchange amount of the heat exchanger is dramatically increased while suppressing the pressure loss of the flow of the target fluid. Can do.
In the heat exchanger according to the sixth aspect of the invention, the heat exchange part is folded at a considerably acute angle, and a heat transfer area of the heat exchange part that is considerably larger than the cross-sectional area of the flow path of the target fluid can be ensured.

In the heat exchanger according to the seventh aspect of the present invention, there is no bent portion in the narrow tube, and the possibility that the flow of the heat medium passing through the narrow tube is obstructed even when the diameter of the narrow tube is very small is reduced.
In the heat exchanger according to the eighth aspect of the present invention, since a pressure loss in the flow of the target fluid can be reduced by providing a gap between the heat exchange parts, a plurality of sheet-like heat exchange parts are arranged to be inclined. If the expansion of the heat transfer area by increasing the surface area of each heat exchange part and the dimension of the gap are balanced, it is possible to secure a heat exchange amount of a predetermined heat exchanger.

In the heat exchanger according to the ninth aspect of the invention, a target fluid that flows to the downstream side of the heat exchanger without heat exchange in the heat exchange portion is likely to be generated, but the size of the gap between the heat exchange portions and heat exchange By appropriately adjusting the area of the part, it is possible to secure a predetermined amount of heat exchange in the heat exchanger while suppressing the pressure loss of the flow of the target fluid in the heat exchanger to be small.
In the heat exchanger according to the tenth invention, the heat exchange amount of the heat exchanger and the pressure loss of the target fluid in the heat exchanger can be changed by adjusting the inclination of the heat exchange section of each group.

In the heat exchanger according to the eleventh aspect of the invention, the heat exchanging portion is woven with a predetermined thickness and tends to cause a large pressure loss when the target fluid passes through, but the thickness direction and the flow direction of the target fluid Since the heat exchanging section is arranged so that the two have an inclination, the pressure loss of the target fluid passing through the heat exchanger can be reduced.
In the heat exchanger according to the twelfth aspect of the present invention, the pressure loss of the target fluid passing through the heat exchanger can be suppressed to a relatively small amount even when the plurality of heat exchange portions are overlapped without any gap.

<Outline of heat exchange system including heat exchanger>
A heat exchanger according to an embodiment of the present invention is disposed in a flow path of air (target fluid) and is used to cool or warm the air flowing through the flow path. As shown in FIG. 1, the heat exchanger 10 is arranged in a channel 90 having a rectangular cross section surrounded by walls 91 on all sides, and air flowing from the upstream side as indicated by an arrow A11. Perform heat exchange. The air that has exchanged heat with the heat exchanger 10 flows downstream as indicated by an arrow A19 and is supplied to the air-conditioning target space or the like. The air flowing as indicated by the arrow A11 may be outside air outside the building or air inside the building. The air flow in the flow path 90 is generated by a blower 95 or the like disposed on the downstream side or the upstream side of the heat exchanger 10.

  Further, the heat exchanger 10 takes in the refrigerant (heat medium) from the outside of the flow path 90 through the refrigerant inlet pipe 11 (see arrow A21 in FIG. 1), and discharges the refrigerant out of the flow path 90 through the refrigerant outlet pipe 12 (see FIG. (See arrow A24 in FIG. 1). When the air is cooled, low-temperature and low-pressure mist refrigerant enters the heat exchanger 10 from the refrigerant inlet pipe 11, and gaseous refrigerant that has been vaporized by removing heat from the air exits the refrigerant outlet pipe 12. On the other hand, when the air is warmed, the gaseous refrigerant that has been pressurized by a compressor or the like enters the heat exchanger 10 from the refrigerant inlet pipe 11, and the liquid refrigerant that is liquefied by releasing heat into the air is the refrigerant outlet pipe. Get out of 12.

In addition, although the heat exchanger 10 comprises the refrigerating cycle with a compressor, another heat exchanger, an expansion mechanism, a switching valve, etc., since such a refrigerating cycle is well-known, description is abbreviate | omitted.
<Detailed configuration of heat exchanger>
Next, a detailed configuration of the heat exchanger 10 will be described with reference to FIGS. 2, 3, and 4 (A).

The heat exchanger 10 mainly includes a header 20, an intermediate portion 30, and a heat exchange sheet group 40 including six heat exchange sheets (heat exchange portions) 41 to 46.
The header 20 collects the refrigerant coming out of the heat exchange sheets 44, 45, 46 and the distribution unit 21 that plays a role of distributing the refrigerant entering from the refrigerant inlet pipe 11 to the heat exchange sheets 41, 42, 43. It is divided into a collecting portion 22 that plays a role of flowing to the outlet pipe 12. The refrigerant that has flowed into the distribution unit 21 from the refrigerant inlet pipe 11 flows through the thin tubes 50 (to be described later) of the heat exchange sheets 41, 42, and 43 and flows into the intermediate unit 30. The intermediate portion 30 is disposed so as to face the header 20 with the heat exchange sheet group 40 interposed therebetween, and communicates with the lower ends of the thin tubes 50 of the heat exchange sheets 41 to 46. The refrigerant that has flowed from the thin tubes 50 of the heat exchange sheets 41, 42, 43 into the intermediate portion 30 flows through the thin tubes 50 of the heat exchange sheets 44, 45, 46 to the collecting portion 22 of the header 20. It flows from the part 22 through the refrigerant outlet pipe 12 to the downstream of the refrigeration cycle.

The heat exchange sheets 41 to 46 of the heat exchange sheet group 40 have the same structure. Here, the heat exchange sheet 46 will be described as an example.
The heat exchange sheet 46 is composed of a large number of thin tubes 50 extending in a direction connecting the header 20 and the intermediate portion 30, and a large number of thin wire members 60 intersecting the thin tubes 50 so as to be substantially orthogonal thereto. Specifically, a large number of thin tubes 50 and a large number of thin wire members 60 are woven together to form a heat exchange sheet 46 having flexibility. As shown in the partially enlarged view of FIG. 3A and the cross-sectional view of FIG. 3B, here, the thin tubes 50 and the thin wire members 60 are interwoven.

  The thin tube 50 is a hollow tube having an outer diameter of 0.5 mm or less (here, 0.3 mm), and is formed from a super engineering plastic (super engineering plastic) excellent in long-term heat resistance and corrosion resistance. The upper end of each thin tube 50 communicates with the header 20 and the lower end communicates with the intermediate portion 30. Further, the gap between adjacent thin tubes 50 is set to 2 mm or less (here, 0.5 to 1.0 mm) on average.

  The thin wire member 60 is a solid linear member having an outer diameter equal to or smaller than that of the thin tube 50, and is formed of a metal or carbon fiber having high heat transfer characteristics. The maximum width of the cross section of the thin wire member 60 is 0.5 mm or less (here, 0.3 mm or less, which is the outer diameter of the thin tube 50). These thin wire members 60 sew a large number of thin tubes 50 and maintain a state in which the large number of thin tubes 50 are arranged at a predetermined pitch. That is, the thin wire member 60 is formed by integrating a large number of thin tubes 50 into one heat exchange sheet 46. Moreover, the clearance gap between adjacent thin wire | line members 60 is set to 0.5-1.0 mm.

  Heat exchange sheets 41 to 46 having a very thin thickness are formed by weaving such thin tubes 50 and thin wire members 60. Further, in the details of the heat exchange sheets 41 to 46, as shown in FIGS. 3A and 3B, the thin tubes 50 and the thin wire members 60 are alternately woven, and the whole is shown in FIG. Thus, it is woven so as to have a gentle unevenness in the thickness direction. Since there are irregularities formed by such weaving, there are many gaps between adjacent sheets when the heat exchange sheets 41 to 46 are stacked, and the stacked heat exchange sheets 41 to 46 ( The pressure loss experienced when air passes through the heat exchange sheet group 40) is reduced. Specifically, when the heat exchange sheets 41 to 46 are overlapped, and the stitches of a certain heat exchange sheet are blocked by the thin tube 50 or the thin wire member 60 of another heat exchange sheet, Since there is a gap in the thickness direction between the sheets, the air resistance is reduced.

A plurality of such heat exchange sheets 41 to 46 are folded back and overlapped in the air flow direction, whereby a compact heat exchange sheet group 40 is formed. As shown in FIG. 3A, each of the heat exchange sheets 41 to 46 is folded back many times at an acute angle of 20 ° or less, and each has a surface area several times the cross-sectional area of the flow path 90. Yes.
And each site | part of the heat exchange sheets 41-46 has an inclination with respect to the air flow direction (direction shown by arrow A11, A19). Therefore, the heat exchange sheet 41 will be described as an example. As shown in FIG. 5, the air flowing from the upstream side of the heat exchanger 10 as indicated by the arrow A <b> 11 once changes the direction of the flow. The direction of the heat exchange sheet 41 is changed to a direction perpendicular to the direction of the heat exchange sheet 41, and then flows downstream as indicated by an arrow A13. When passing through the stitches of the heat exchange sheet 41, the resistance seems to be large because it passes through the fine stitches, but the heat exchange sheet 41 has an inclination with respect to the air flow direction (direction indicated by arrow A11 etc.), so The amount of air passing through per unit area of the sheet 41 is not so large, and the pressure loss of the air flow by the heat exchange sheet 41 as a whole is small.

Moreover, each heat exchange sheet | seat 41-46 is return | folded by the part of the thin wire | line member 60 instead of the thin tube 50, and the refrigerant | coolant which flows through the thin tube 50 is hardly received by the return.
The heat exchange sheets 41 to 46 folded back in this way are arranged so that adjacent heat exchange sheets are in contact with each other in the thickness direction and overlap each other. Specifically, as shown in FIGS. 3A and 4, the heat exchange sheets 41 to 46 are overlapped with a naturally occurring gap. The naturally occurring gap here is the gap described with reference to FIG. In FIG. 4, the gaps described with reference to FIG. 6 are averaged to simply show the gaps.

<Characteristics of heat exchanger>
(1)
In the heat exchanger 10, the plurality of heat exchange sheets 41 to 46 including the thin tubes 50 are disposed so as to overlap in the thickness direction, and the thickness direction and the air flow direction (directions indicated by arrows A11 and A19) Are arranged so as to be inclined. That is, the surfaces of the heat exchange sheets 41 to 46 are not perpendicular to the air flow direction (see arrow A11) as shown in FIG. 4B, but are perpendicular to the air flow direction. It is inclined with respect to the correct surface. Therefore, the heat exchange sheet group 40 including the six heat exchange sheets 41 to 46 shown in FIG. 4A is a heat exchange sheet in which a plurality of heat exchange sheets are arranged in parallel on a plane perpendicular to the air flow direction. Compared to the group 100 (see FIG. 4B), the pressure loss when the air passes through the heat exchange sheet group 40 can be reduced while ensuring a large heat transfer area.

  The heat exchange sheet 41 will be described in more detail using the example. As described above, the air flowing from the upstream side of the heat exchanger 10 as indicated by the arrow A11 is changed to a direction perpendicular to the heat exchange sheet 41 as shown in FIG. It passes through the stitch of the exchange sheet 41 and then flows downstream as indicated by an arrow A13. When passing through the stitches of the heat exchange sheet 41, the resistance seems to be large because it passes through the fine stitches, but the heat exchange sheet 41 has an inclination with respect to the air flow direction (direction indicated by the arrow A11 etc.), so heat exchange is performed. The amount of air passing through per unit area of the seat 41 is not so large, and the pressure loss of the air flow due to the heat exchange sheet 41 is reduced as a whole. Specifically, in order to increase the area of the heat exchange sheet, a case where a plurality of heat exchange sheets are arranged on a surface perpendicular to the direction of air flow as shown in FIG. When the structure shown in FIG. 4 (A) in which the area of the heat exchange sheet is increased is compared with the case where the equivalent heat exchange amount can be secured, the pressure in the latter case of the structure in FIG. 4 (A) The loss is about one tenth of the pressure loss in the former case of the structure of FIG. This comparison also takes into account that in the case of the structure of FIG. 4A, pressure loss occurs due to the rapid deceleration and acceleration of the air flow as shown in FIG.

Thus, here, the heat exchanger which can suppress the pressure loss at the time of air passing through the heat exchange sheet group 40 small, ensuring a large heat transfer area using the plurality of heat exchange sheets 41 to 46. 10 is realized.
(2)
In the heat exchanger 10, since the outer diameter of the thin tube 50 of each heat exchange sheet 41-46 is reduced to 0.3 mm and 0.5 mm or less, the high flexibility of each heat exchange sheet 41-46 is maintained. Is done. Moreover, since the clearance gap between adjacent thin tubes 50 is reduced to 2 mm or less in each heat exchange sheet 41 to 46, the amount of air that passes through the heat exchange sheets 41 to 46 with little heat exchange. It can be kept small.

(3)
In the heat exchanger 10, each part of the heat exchange sheets 41 to 46 is inclined with respect to the air flow direction by turning back each of the heat exchange sheets 41 to 46 a plurality of times. Thereby, it is possible to easily realize that the air flow direction and the thickness direction of the heat exchange sheets 41 to 46 are inclined while the entire flow path 90 is covered with the heat exchange sheets 41 to 46.

  In addition, since the heat exchange sheets 41 to 46 are diffracted so that a plurality of creases are formed, the heat exchange sheet is transmitted in comparison with a structure in which the heat exchange sheet is slightly inclined with respect to a plane perpendicular to the air flow direction. The thermal area can be greatly expanded. In particular, here, since the heat exchange sheets 41 to 46 are bent at a considerably acute angle at the portion of the thin wire member 60, the area of each of the heat exchange sheets 41 to 46 reaches a dozen times the cross-sectional area of the flow path 90. The amount of heat exchange in the heat exchanger 10 has also increased dramatically.

(4)
In each of the heat exchange sheets 41 to 46 of the heat exchanger 10, since the thin wire member 60 is folded instead of the thin tube 50, there is no bent portion in the thin tube 50, and the outer diameter of the thin tube 50 is as very large as 0.3 mm. Despite being small, the flow of the refrigerant passing through the narrow tube 50 is hardly obstructed. In particular, the heat exchange sheets 41 to 46 are bent at an acute angle, but the thin tube 50 is not bent, and the refrigerant flow in the thin tube 50 is hardly adversely affected.

  Moreover, in the heat exchanger 10, what consists of a metal or carbon fiber is employ | adopted as the thin wire member 60 which plays the role which integrates many thin tubes 50. FIG. That is, a material having high heat transfer characteristics is used for the thin wire member 60 that integrates a large number of thin tubes 50. For this reason, these thin wire members 60 serve not only to integrate the thin tubes 50 but also to serve as heat transfer members that assist heat exchange between the thin tubes 50 and the air. The air flowing between the thin tubes 50 exchanges more heat with the thin tubes 50 through the thin wire member 60 excellent in heat transfer characteristics connecting the thin tubes 50. Thus, in the heat exchanger 10, the heat exchange efficiency is very high.

(5)
As shown in FIGS. 3 (A) and 3 (B), the heat exchange sheets 41 to 46 of the heat exchanger 10 are woven alternately with the thin tubes 50 and the thin wire members 60, and as a whole, As shown in FIG. 6, it is woven so as to have a gentle unevenness in the thickness direction. Since there is unevenness formed as a whole by such weaving, each of the heat exchange sheets 41 to 46 has a thickness as a whole even when the heat exchange sheets 41 to 46 are overlapped with other heat exchange sheets. It's like being able to go through.

  Thereby, when the heat exchange sheets 41 to 46 are overlapped, even when the thin tube 50 or the thin wire member 60 of the other heat exchange sheet is planarly closed, the stitches of a certain heat exchange sheet can be closed between the sheets. Air passes through the gap in the thickness direction. In other words, it is possible to suppress the pressure loss due to the heat exchanger 10 from being unexpectedly increased by weaving the heat exchange sheets 41 to 46 so that a natural gap is formed between the heat exchange sheets 41 to 46 to be overlapped. ing.

  In addition, in the heat exchanger 10, the heat exchange sheet when forming the wavy heat exchange sheets 41-46 with the unevenness | corrugations as a whole by devising the weaving method of the thin tube 50 and the thin wire | line member 60, and piling up them A gap is secured between the spacers, but the spacer may be formed between the heat exchange sheets more reliably. Moreover, you may make it ensure the clearance gap between heat exchange sheets by making a spacer adhere to the flat heat exchange sheet which does not wave.

(6)
In the heat exchanger 10, a large number of thin tubes 50 are integrated by weaving the thin tubes 50 and the thin wire members 60, and are integrated as compared to a structure in which the intersecting thin tubes 50 and the thin wire members 60 are bonded. Is less likely to collapse.
Further, since the thin tube 50 and the thin wire member 60 are woven as shown in FIGS. 3A and 3B, when the air is passed through the heat exchanger 10, the air flow is moderately disturbed. Due to this disturbance, the amount of heat exchange between the air and the thin tube 50 is further increased.

<First Modification>
In the above-described embodiment, the heat exchange sheet group 40 is configured by folding back each of the heat exchange sheets 41 to 46 in the air flow direction, and the heat exchange sheet group 40 is formed in the heat exchanger 10. Alternatively, the heat exchange sheet group 110 shown in FIG. 7 can be employed.
The heat exchange sheet group 110 is composed of a plurality of heat exchange sheets that are similar to the heat exchange sheets 41 to 46 and are not folded back. As shown in FIG. 7, the thickness direction of these heat exchange sheets is inclined with respect to the air flow direction (see arrow A11). In the heat exchange sheet group 110, the heat exchange sheets are orthogonal to the air flow direction. A plurality of heat exchange sheets are arranged with a gap between each other in the direction in which they are made.

  In the heat exchanger that employs the heat exchange sheet group 110 instead of the heat exchange sheet group 40, there is a passage between the heat exchange sheets that connects the upstream side and the downstream side of the heat exchanger without the heat exchange sheet. Therefore, there is air that flows from the upstream side to the downstream side of the heat exchanger without passing between the narrow tubes 50 of any heat exchange sheet through the passage. However, since the gap between the heat exchange sheets is reduced to some extent and the heat exchange sheet is inclined with respect to the air flow direction, the heat exchanger employing the heat exchange sheet group 110 shown in FIG. The exchange amount can be secured.

<Second Modification>
As a heat exchanger further developed from the first modification, the heat exchange sheet group 120 including the first heat exchange sheet group 121 and the second heat exchange sheet group 122 shown in FIG. What can be used instead is considered.
Here, the first heat exchange sheet group 121 and the second heat exchange sheet group 122 having the same configuration as the above-described heat exchange sheet group 110 are arranged in the air flow direction (see arrow A11) with a slight gap therebetween. ing. And the inclination with respect to the air flow direction of each heat exchange sheet in the first heat exchange sheet group 121 and the inclination with respect to the air flow direction of each heat exchange sheet in the second heat exchange sheet group 122 are set to different inclinations. doing. Thus, since the inclination of the heat exchange sheet is different between the first heat exchange sheet group 121 and the second heat exchange sheet group 122, the air passing through these heat exchange sheet groups 121 and 122 causes complicated disturbances in various places. The amount of heat exchange with the thin tube 50 increases.

In this heat exchanger, the amount of air pressure loss in the heat exchanger can be changed or the amount of heat exchange can be adjusted by changing the inclination of the heat exchange sheet in each of the heat exchange sheet groups 121 and 122. Is possible.
<Third Modification>
As one form of the first modified example, a heat exchange sheet group 130 in which the thickness direction of the plurality of heat exchange sheets is inclined by 90 ° with respect to the air flow direction (see arrow A11) is referred to as the heat exchange sheet group 40 described above. A heat exchanger to be used instead can be mentioned.

  Here, the surface of each heat exchange sheet has a shape along the air flow direction. Therefore, in the configuration in which a gap exists between the heat exchange sheets, there is no obstacle in the air flow in the gap, and the pressure loss of the air flow flowing from the upstream side to the downstream side of the heat exchanger is reduced. It becomes easy to do. On the other hand, in the heat exchange sheet group 130, air that flows downstream without heat exchange tends to increase, but the size of the gap between the heat exchange sheets and the area of the heat exchange sheet are adjusted to appropriate values. Thus, it is possible to secure a predetermined amount of heat exchange in the heat exchanger while suppressing the pressure loss of the air flow in the heat exchanger to be small.

<Fourth Modification>
In the said embodiment, although the solid cylindrical thin wire member 60 formed from a metal or carbon fiber is woven with the thin tube 50 and the heat exchange sheets 41-46 are made, it replaces with such a thin wire member 60, You may use the thin wire | line member 62 shown in FIG.
Whereas the cross section of the thin wire member 60 is circular, the cross section of the thin wire member 62 has a flat shape, which is a shape close to an ellipse. The thin wire member 62 has a large contact area with the thin tube 50 due to the flat cross section. The maximum width W of the cross section of the thin wire member 62 is set to about 0.3 mm which is the outer diameter of the thin tube 50.

Thus, since the contact area of the thin wire member 62 with the thin tube 50 is large, the heat exchanged between the thin wire member 62 and the air is easily transmitted to the thin tube 50. For this reason, the amount of heat exchange between the air and the refrigerant in the narrow tube 50 increases.
<Fifth Modification>
In the above embodiment, the solid single wire member 60 made of metal or carbon fiber is woven with the thin tube 50 to make the heat exchange sheets 41 to 46. However, instead of such a thin member 60, FIG. 11 may be used.

Whereas the thin wire member 60 is a single wire, the thin wire member 63 is formed by twisting a plurality of single wires 63a made of metal (detailed illustration is omitted in FIG. 11A, see FIG. 11B). ). For this reason, in addition to the improvement in strength stability, the thin wire member 63 plays a role of causing local disturbance of the air flow and contributes to the improvement of the heat exchange efficiency of the heat exchanger.
<Sixth Modification>
In the above embodiment, the solid thin wire member 60 formed of metal or carbon fiber is woven with the thin tube 50 to make the heat exchange sheets 41 to 46, but instead of such a thin wire member 60, FIG. The thin wire member 64 shown may be used.

The thin wire member 64 has a non-circular cross section so that the area of the outer surface is larger than when the cross section is circular as in the thin wire member 60. Specifically, as shown in FIG. 12, the fine particles 64a are fixed and integrated around the thin wire member 64, and when a cross section is viewed, many small protrusions are attached around the circle. It can be seen (see FIG. 12B).
As described above, the fine wire member 64 has a non-circular cross section due to the adhering of the fine particles 64a, and the area of the outer surface of the fine wire member 64 is increased, so that heat exchange between the thin tube 50 and the air is assisted. The effect | action of the thin wire | line member 64 as a heat-transfer member is improving. In addition, the presence of the fine particles 64a causes local disturbance of the air flow and improves the heat exchange efficiency of the heat exchanger.

<Seventh Modification>
In the above embodiment, the heat exchange sheets 41 to 46 are made by weaving the thin wire member 60 with the thin tube 50, but heat exchange is performed by the thin wire member 65 that contacts the thin tube 50 but is not woven into the thin tube 50 instead of the thin wire member 60. It is also possible to form a sheet.
As shown in FIG. 13, the thin wire member 65 is orthogonal to the thin tubes 50 and is in contact with the thin tubes 50, but is not woven into the thin tubes 50. These thin wire members 65 are made of metal or carbon fiber, and are fixed to the thin tube 50 by an adhesive, or are fixed to the thin tube 50 by heat treatment.

When the thin wire member 65 is fixed to the thin tube 50 by heat treatment, the surface of the resin thin tube 50 is partially dissolved, and the thin tube 50 and the thin wire member 65 are fixed by subsequent cooling.
<Eighth Modification>
In the said embodiment, although the heat exchange sheets 41-46 are made by weaving the thin wire member 60 and the thin tube 50, it heat-processes further to the heat exchange sheets 41-46 so that the arrangement | positioning pitch etc. of the thin tube 50 may not collapse. May be applied. If the heat treatment is performed in this manner to increase the integrity of the thin tube 50 and the thin wire member 60, the relative positional relationship between the thin tubes 50 and the thin tube 50 and the thin wire member 60 may change, resulting in a decrease in heat exchange efficiency. It can be avoided.

<Ninth Modification>
The heat exchanger 10 is disposed in the air flow path 90 and is used to cool or warm the air flowing through the flow path 90, but the target fluid is not limited to air. Absent. Further, the flow path is not limited to the flow path 90 described above. For example, the heat exchanger according to the present invention can be used as a heat exchanger in an indoor unit or an outdoor unit of an air conditioner.

<10th modification>
In the above embodiment, the heat exchange sheets 41 to 46 are made by weaving the thin wire member 60 and the thin tube 50, but the heat exchange sheet is formed using only the thin tube 50 through which the refrigerant passes without using the thin wire member 60. It can also be made. In this case, depending on the size of the thin tube 50, it may be assumed that the degree of bending of the heat exchange sheet is limited, but since an improvement in heat exchange efficiency can be expected by configuring the heat exchange sheet with only the thin tube 50, It is possible to realize a heat exchanger having a sufficiently high heat exchange efficiency.

<Eleventh Modification>
In the above embodiment, the heat exchange sheets 41 to 46 are made by weaving the thin wire member 60 formed of metal or carbon fiber with the thin tube 50, but it may be better to use a resin thin wire member. Although the heat exchange efficiency of the heat exchanger is improved by making a thin wire member from metal or carbon fiber, it is also conceivable to adopt a resin thin wire member with emphasis on corrosion resistance, heat resistance and the like.

  Since the heat exchanger according to the present invention can suppress a pressure loss when the target fluid passes through a plurality of heat exchange portions while ensuring a large heat transfer area, the heat exchange efficiency is increased and the target fluid is increased. It is also useful as a heat exchanger used in air conditioning equipment and refrigeration equipment.

The figure which has arrange | positioned the heat exchanger which concerns on one Embodiment of this invention in the flow path of the air which is a target fluid of heat exchange. The schematic perspective view of a heat exchanger. The figure which extracted the part of the heat exchange sheet | seat of a heat exchanger. (A) is a perspective view and a partially enlarged view. (B) is sectional drawing of the B arrow of FIG. 3 (A). (A) ... IV-IV arrow sectional drawing of FIG. (B)... Sectional view of a comparative structure corresponding to FIG. The figure which shows the detailed flow of the air at the time of passing a heat exchange sheet | seat. The figure which shows the detailed overlap condition of a heat exchange sheet. Sectional drawing equivalent to FIG. 4 (A) of the heat exchanger which concerns on a 1st modification. Sectional drawing equivalent to FIG. 4 (A) of the heat exchanger which concerns on a 2nd modification. Sectional drawing equivalent to FIG. 4 (A) of the heat exchanger which concerns on a 3rd modification. (A) ... Partial enlarged view of the heat exchange sheet of the fourth modification. (B) ... BB arrow sectional drawing of FIG. 10 (A). (A) ... Partial enlarged view of the heat exchange sheet of the fifth modification. (B) ... BB arrow sectional drawing of Drawing 11 (A). (A) ... Partial enlargement of the heat exchange sheet of the sixth modification. (B) ... BB arrow sectional drawing of FIG. 12 (A). (A) ... Partial enlarged view of the heat exchange sheet of the seventh modification. (B) ... BB arrow sectional drawing of FIG. 13 (A).

Explanation of symbols

10 heat exchanger 40 heat exchange sheet group 41-46 heat exchange sheet (heat exchange part)
50 thin tube 60 thin wire member 90 flow path 121 first heat exchange sheet group 122 second heat exchange sheet group

Claims (12)

A heat exchanger (10) for performing heat exchange between a target fluid and a heat medium,
A plurality of hollow thin tubes through which the heat medium passes are integrated with each other, or a plurality of hollow thin tubes (50) and a plurality of thin wire members (60) through which the heat medium passes. It is provided with a plurality of sheet-like heat exchange parts (41 to 46) integrated so as to intersect with each other.
The adjacent heat exchange parts are arranged so as to overlap in the thickness direction,
The thickness direction of the heat exchange part has an inclination with respect to the flow direction of the target fluid.
Heat exchanger. The thin tube (50) has an outer diameter of 1 mm or less.
The heat exchanger according to claim 1. The gap between the adjacent thin tubes (50) is 3 mm or less,
The heat exchanger according to claim 1 or 2. Each of the heat exchange units (41 to 46) is folded so as to have a plurality of creases, and at least a part of the thickness direction has an inclination with respect to the flow direction of the target fluid.
The heat exchanger according to any one of claims 1 to 3. Each of the heat exchange parts (41 to 46) has a surface area larger than a cross-sectional area of a flow path (90) through which the target fluid flows.
The heat exchanger according to claim 4. The heat exchange part (41 to 46) is folded at 20 ° or less at the fold line,
The heat exchanger according to claim 4 or 5. The heat exchanging portions (41 to 46) are formed by integrating a plurality of hollow thin tubes (50) through which the heat medium passes and a plurality of thin wire members (60). Rather than being folded so that the thin wire member is bent,
The heat exchanger according to any one of claims 4 to 6. The plurality of heat exchange units are arranged in a direction intersecting the flow direction of the target fluid with a gap therebetween,
The heat exchanger according to any one of claims 1 to 3. The thickness direction of the heat exchange part has an inclination of 90 ° with respect to the flow direction of the target fluid.
The heat exchanger according to claim 8. The plurality of heat exchange parts are divided into a first heat exchange part group (121) and a second heat exchange part group (122), and are arranged in a direction intersecting the flow direction of the target fluid with a gap in each group. And
The second heat exchange unit group is disposed on the downstream side in the flow direction of the target fluid of the first heat exchange unit group,
The inclination of the heat exchanger of the first heat exchange section group is different from the inclination of the heat exchanger of the second heat exchange section group.
The heat exchanger according to claim 8. The heat exchanging portion is a heat exchanging portion having a predetermined thickness in which the thin tubes intersecting each other, or in which the thin tubes intersecting with the thin wire members are woven.
The heat exchanger according to any one of claims 1 to 10. The thickness of the heat exchange part is a thickness that allows the target fluid to pass through in the thickness direction even when overlapped with other heat exchange parts.
The heat exchanger according to claim 11.

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