JP2006162155A - Tube for heat exchanger and heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube for a heat exchanger and the heat exchanger, capable of increasing the heat transfer area, and capable of increasing heat transfer efficiency. <P>SOLUTION: This tube 2 for the heat exchanger has a plurality of fluid passages 10 for flowing fluid in the longitudinal direction; and is characterized by having a wall member 12 extended toward a central area of the fluid passages 10 from an inner wall surface 11 for forming the fluid passages 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger tube and a heat exchanger.

As a heat exchanger tube having a plurality of fluid passages through which a fluid (for example, a refrigerant) passes in a longitudinal direction, a tube perforated so that the cross-sectional shape of each fluid passage is circular (perfect circle) is known. (For example, see Patent Document 1).
Japanese Patent Laid-Open No. 2003-121086

However, in the heat exchanger tube described in Patent Document 1, since the cross-sectional shape of each fluid passage is perforated, a sufficient heat transfer area cannot be secured, and heat transfer is performed. There was a problem that efficiency was not so good.
Further, simply increasing the diameter of the fluid passage in order to increase the heat transfer area reduces the flow velocity of the fluid passing through the fluid passage, which in turn deteriorates the heat transfer efficiency. .

  The present invention has been made in view of the above circumstances, and has an object to provide a heat exchanger tube and a heat exchanger that can increase the heat transfer area and increase the heat transfer efficiency. Yes.

The present invention employs the following means in order to solve the above problems.
The heat exchanger tube according to claim 1 is a heat exchanger tube having a plurality of fluid passages through which a fluid flows along a longitudinal direction, from an inner wall surface forming the fluid passage to a central region of the fluid passage. It has the wall member extended towards, It is characterized by the above-mentioned.
According to such a heat exchange tube, the wall member increases the inner wall area of the fluid passage. As a result, the heat transfer area can be increased and the heat transfer efficiency can be improved.

The heat exchanger tube according to claim 2, wherein the fluid passage has a substantially circular cross section, and the wall member is a rib provided toward a radially inner side of the fluid passage. .
According to such a heat exchanger tube, since the rib is provided radially inward from the inner wall surface of the fluid passage, the contact area between the fluid passing through the fluid passage and the tube, that is, the heat transfer area And the heat transfer efficiency can be increased.

The tube for a heat exchanger according to a third aspect is characterized in that the wall member is provided so as to partition the fluid passage.
According to such a heat exchanger tube, since both ends of the wall member partitioning the fluid passage (both ends when a longitudinal section perpendicular to the longitudinal direction of the fluid passage is viewed) are connected to the inner wall surface, heat is reliably transferred. Configuration can be provided.

The tube for a heat exchanger according to a fourth aspect is characterized in that the wall member is provided so that both end portions extend from the inner wall surfaces facing the fluid passage.
According to such a heat exchanger tube, since the wall member is provided so as to connect the inner wall surface of the fluid passage and the inner wall surface at a position facing the inner wall surface, the strength of the tube is improved. In addition, the pressure resistance can be further improved. In addition, the heat transfer area can be increased and the heat transfer efficiency can be increased.

The tube for a heat exchanger according to claim 5 is characterized in that a convex portion is provided on the surface of the wall member.
According to such a heat exchanger tube, the convex portion is formed from the surface of the wall member into the fluid passage, whereby the contact area between the fluid passing through the fluid passage and the tube, that is, the heat transfer. The area can be further increased, and the heat transfer efficiency can be further increased.

A heat exchanger according to a sixth aspect is characterized by comprising the heat exchanger tube according to any one of the first to fifth aspects.
According to such a heat exchanger, the contact area between the fluid and the tube passing through the fluid passage, that is, the heat transfer area can be increased and the heat transfer efficiency can be increased. Therefore, heat exchange efficiency can be improved.

According to the heat exchanger tube of the present invention, the contact area between the fluid passing through the fluid passage and the tube, that is, the heat transfer area can be increased, and the heat transfer efficiency can be increased. Play.
Moreover, according to the heat exchanger by this invention, there exists an effect that the improvement of heat exchange efficiency can be aimed at.

Hereinafter, as an example of providing a wall member for increasing the area of the inner wall surface of a fluid passage provided in the heat exchanger tube, refer to the drawings for the heat exchanger having the first embodiment of the heat exchanger tube according to the present invention. While explaining.
FIG. 5 is a plan view showing a schematic configuration of the heat exchanger 1. As shown in FIG. 5, the heat exchanger 1 includes a plurality of heat exchanger tubes (hereinafter referred to as “tubes”) 2 and a plurality of (stacked) tubes disposed between the tubes 2 and 2. The main elements are the fins 3, the headers 4 disposed at both ends of the tube 2, and the frame 5 disposed between the headers 4 and 4.

The tube 2 is an elongate plate-like member made of, for example, an aluminum alloy and formed so that the cross-sectional shape thereof has the flat shape shown in FIG. In the tube 2, a plurality (five in this embodiment) of fluid passages 10 along the longitudinal direction of the tube 2 (the direction perpendicular to the paper surface in FIG. 1; the left-right direction in FIG. 5) are, for example, extruded. It is formed by. And as a wall member provided in the inner wall surface of the fluid passage 10 over the longitudinal direction of this tube 2, in each fluid passage 10, the rib which protrudes toward inner radial direction from the inner wall surface 11 spaced apart at 90 degree intervals ( Four wall members 12 are provided.
Specifically, the ribs 12 are plate-like members formed along the longitudinal direction of the tube 2, that is, the direction in which the fluid passage 10 extends, and are continuously (or intermittently) from one end to the other end of the tube 2. In fact, it is made of the same material and has no change in thermal conductivity because it is formed by extrusion. Further, the end surfaces (end surfaces on the inner side in the radial direction) of these ribs 12 extending toward the central region of the fluid passage are separated from each other, and are configured so that the fluid can pass through the central portion of each fluid passage 10. Yes.

  The fin 3 is a thin plate-like member having substantially the same width as the width of the tube 2 (a direction orthogonal to the longitudinal direction of the tube 2), and is formed so that its planar view shape has a waveform as shown in FIG. It has been done. As for each fin 3, the outer surface of the peak part (end part located in the upper side in FIG. 5) abuts on the lower surface of the tube 2, and the valley part (end part located in the lower side in FIG. 5) The outer surface is configured to come into contact with the upper surface of the tube 2, and the heat of the tube 2 can be transmitted to the fins 3.

Each header 4 is provided with a tube insertion hole (not shown) into which one end or the other end of the tube 2 is inserted, and one end or the other end of the tube 2 inserted into the tube insertion hole is For example, it is fixed to each header 4 by brazing.
Further, one header 4 is provided with a fluid introduction pipe 7 that guides fluid (for example, refrigerant) into the header 4, and the other header 4 is guided into the header 4 through the fluid passage 10. A fluid outlet pipe 8 is provided for guiding the fluid from the header 4 to the outside.

  The frame 5 is a reinforcing member that is disposed at the upper end and the lower end of the heat exchanger 1, and has one end connected to one header 4 and the other end connected to the other header 4. Thereby, even if the force of the direction in which the header 4 and the header 4 approach is added to the heat exchanger 1, the tube 2 and the fin 3 do not buckle.

In the heat exchanger 1 configured as described above, the fluid (for example, refrigerant) that flows into the one header 4 from the fluid introduction pipe 7 passes through the fluid passage 10 formed in each tube 2 and the other. After being introduced into the header 4, the fluid flows out from the fluid outlet pipe 8.
Further, in the space formed between the tube 2 and the tube 2 and between the fin 3 and the fin 3, the direction perpendicular to the flow direction of the fluid passing through the fluid passage 10 (that is, on the paper surface in FIG. 5). Another fluid (for example, air: outside air) is allowed to pass through in the direction orthogonal to the fluid, so that the fluid passing through the fluid passage 10, between the tube 2 and the tube 2, and the fin 3 and the fin Heat exchange is performed with the fluid passing through the space formed between the two.

According to the tube 2 according to the present embodiment, the rib 12 functioning as a wall member extending from the inner wall surface 11 forming the fluid passage 10 toward the fluid passage central region is formed. As a result, the area of the inner wall surface of the fluid passage 10 increases, and as a result, the heat transfer area increases. In particular, in the present embodiment, a plurality of ribs 12 are provided radially inward from the inner wall surface 11 of the fluid passage 10, so that the contact area between the fluid that passes through the fluid passage 10 and the tube 2, that is, the transmission is transmitted. The heat area can be increased and the heat transfer efficiency can be increased.
Further, since the rib 12 is provided along the direction in which the fluid passage 10 extends so as to extend in the longitudinal direction of the tube 2, the rigidity of the tube 2 can be improved. Furthermore, in the present embodiment, although a substantially circular cross section may occur during the molding process, the cross-sectional shape of each fluid passage 10 is based on a circle (perfect circle), and therefore all the ribs 12 are assumed to be at the root. Even if it is damaged, the cross-sectional shape of the fluid passage 10 can be maintained (maintained) in a circular shape, and a significant decrease in pressure resistance can be prevented.
Furthermore, according to the heat exchanger 1 having such a tube 2, since the heat transfer area in each tube 2 is increased and the heat transfer efficiency is increased, the heat exchange efficiency is improved. Can do.

A second embodiment of the tube according to the present invention will be described with reference to FIG.
The tube 2a in the present embodiment employs a configuration in which wall members are provided so as to partition the fluid passage, and in particular, both ends of the wall member (both ends when viewing a longitudinal section perpendicular to the longitudinal direction of the fluid passage) are internal. It differs from the thing of 1st Embodiment mentioned above by the point that the partition wall (wall member) 22 is provided instead of the rib 12 mentioned above so that it may connect with a wall surface. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

The partition wall 22 is, for example, a partition plate that bisects the fluid passage 10 vertically as shown in FIG. 2, and is formed continuously from one end of the tube 2 to the other end. The portion is provided so as to extend from the opposing inner wall surface of the fluid passage 10.
By adopting a configuration in which the partition wall 22 is provided so as to partition the fluid passage 10, heat is reliably transferred through both ends of the partition wall 22 regardless of how the refrigerant in the fluid passage 10 flows. . In particular, by providing the partition wall 22 so as to connect the opposed inner wall surfaces, the strength of the tube 2 can be improved, and the pressure resistance can be improved accordingly.
In addition, since the partition wall 22 that is a wall member that partitions the fluid passage 10 reaches the central region of the fluid passage 10, heat transfer can be reliably achieved even if the flow rate of the refrigerant flowing through the fluid passage changes.
The other operational effects of the tube 2a according to the present embodiment are the same as those of the first embodiment described above, so the description thereof is omitted here.

A third embodiment of the tube according to the present invention will be described with reference to FIG.
The tube 2b in the present embodiment is different from that in the first embodiment described above in that a partition wall (wall member) 32 is provided as a wall member in place of the rib 12 described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

The partition wall 32 is, for example, a partition plate that divides the fluid passage 10 into four parts vertically and horizontally, and is continuously formed from one end of the tube 2 to the other end.
Since the partition wall 32 that partitions the fluid passage 10 into four parts is provided, the strength of the tube 2 can be further improved, and the pressure resistance can be improved accordingly.
In addition, since the partition wall 32 that is a wall member that partitions the fluid passage 10 reaches the central region of the fluid passage 10, heat transfer can be reliably achieved even if the flow rate of the refrigerant flowing through the fluid passage changes.
Other functions and effects of the tube 2b according to the present embodiment are the same as those of the first embodiment described above, and a description thereof will be omitted here.

A fourth embodiment of the tube according to the present invention will be described with reference to FIG.
The tube 2c in the present embodiment is different from that in the first embodiment described above in that a partition wall (wall member) 42 is provided instead of the rib 12 described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

The partition wall 42 is, for example, a partition plate that bisects the fluid passage 10 vertically, and is continuously formed from one end of the tube 2 to the other end. Thereby, while being able to improve the intensity | strength of the tube 2, pressure resistance can be improved in connection with this.
In addition, a plurality of (three in this embodiment) projections (convex portions) 42a having a mountain shape in sectional view from each surface of the partition wall 42 toward the opposing inner wall surface 11 are provided. The heat transfer area in 2 is further improved.
The other operational effects of the tube 2c according to the present embodiment are the same as those of the first embodiment described above, and therefore description thereof is omitted here.

The present embodiment is not limited to the above-described embodiment. For example, the rib 12 described in the first embodiment may be two ribs spaced apart by 180 degrees. , Six ribs spaced at intervals of 60 degrees may be used, and can be selected as necessary.
Further, the planar view shape of the protrusion 42a described in the fourth embodiment is not limited to the mountain shape (saw blade shape) as shown in FIG. 4, and can be appropriately selected as necessary.

It is a longitudinal cross-sectional view which shows 1st Embodiment of the tube for heat exchangers by this invention. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the tube for heat exchangers by this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the tube for heat exchangers by this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of the tube for heat exchangers by this invention. It is a top view which shows schematic structure of the heat exchanger which comprises the tube for heat exchangers by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube for heat exchanger 2a Tube for heat exchanger 2b Tube for heat exchanger 2c Tube for heat exchanger 10 Fluid passage 11 Inner wall surface 12 Rib (wall member)
22 Partition wall (wall member)
32 Partition wall (wall member)
42 Partition wall (wall member)
42a Protrusion (convex part)

Claims (6)

A heat exchanger tube having a plurality of fluid passages through which a fluid flows along the longitudinal direction,
A heat exchanger tube, comprising: a wall member extending from an inner wall surface forming the fluid passage toward a central region of the fluid passage. The fluid passage has a substantially circular cross section;
The heat exchanger tube according to claim 1, wherein the wall member is a rib provided toward a radially inner side of the fluid passage. The heat exchanger tube according to claim 1, wherein the wall member is provided so as to partition the fluid passage. The heat exchanger tube according to claim 3, wherein the wall member is provided so that both end portions thereof extend from inner wall surfaces opposed to the fluid passage. The tube for a heat exchanger according to any one of claims 1 to 4, wherein a convex portion is provided on a surface of the wall member.   A heat exchanger comprising the heat exchanger tube according to any one of claims 1 to 5.

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