JPH10148492A - Heating medium flow pipe and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate inflow of a heating medium, to reduce flow resistance, and to improve heat transfer efficiency by a method wherein one end part of a heating medium flow pipe is obliquely opened. SOLUTION: A tube 2 being a heating medium flow pipe has a given length L, a heating medium flows through an inner hole 5, and air heat-exchanged with the heating medium flows through the outside. One end part 3 and the other end part 6 are obliquely opened and have opening surfaces 4 and 7. In this case, when the opening surface 4 is pointed obliquely downward, the opening surface 7 is pointed obliquely upward. The cross section of the tube 2 is a rectangular hollow section. A hollow part 5 is divided into a rectangular shape and a wave-form when occasion demands, and forms a plurality of flow passages. This constitution increases the sectional areas of the opening surfaces 4 and 7 and facilitates inflow of the heating medium, decreases flow resistance, and improves heat transfer efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat medium flow pipe through which a heat medium flows, and a parallel flow heat exchanger having a plurality of heat medium flow pipes provided in parallel.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing an example of a conventional heat exchanger. This heat exchanger 100 is a so-called parallel flow type having a plurality of tubes 104 (heat medium flow tubes) of a predetermined length provided in parallel at a constant interval from each other. Opening surfaces 104 at both ends of tube 104
a, 104b are perpendicular to the longitudinal direction.
The refrigerant (heat medium) 103 flows from the inlet pipe 101 to the inlet header tank 102, changes its flow direction, and is distributed and flows in only the pressure difference in the longitudinal direction of the tube 104. The refrigerant 103 flowing through the tube 104 gathers in the outlet header tank 105 and flows out of the outlet pipe 106. Fins 107 are provided between the plurality of tubes 104, and air passes between the tubes 104 and the fins 107. The refrigerant 103 and the air exchange heat via the tube 104 and the fin 107.

[0003]

However, the heat exchanger 100 has a function of distributing the heat medium 103 to the tubes 104 in the inlet header tank 102 and the outlet header tank 1.
If the collection of the heat medium 103 from the tubes 104 at 05 becomes non-uniform for each tube, the uniform flow of the heat medium in the heat exchanger as a whole is impaired, and the heat exchange capacity is reduced.
In order to improve the heat exchange capacity, it is necessary to distribute the heat medium uniformly throughout the tube.

FIG. 7 is an explanatory view showing a heat exchanger for solving the above problem. This heat exchanger 110
Is to reduce the number of tubes 115 to which the heat medium is distributed in the header tanks 111 to 113 gradually to make the tubes 115 uniform, and is a so-called multi-pass type. In FIG. 7, as indicated by the thick arrow 116, the heat medium 118 flows out between the header tanks 111 to 114 through three passes. However, since the heat exchanger 110 inevitably has a reduced heat medium flow cross-sectional area, the flow resistance increases accordingly, and the heat exchange efficiency is impaired as a whole.

FIG. 8 is a cross-sectional view of a principal part showing another heat exchanger for uniform distribution of the heat medium (Japanese Utility Model Laid-Open No. 3-21687). In the heat exchanger 120 shown here, the structure of the header tank 121 is devised,
Another distribution pipe 123 is provided between the inlet pipe 122 and the header tank 121, and a plurality of tubes 12
4 are provided, a plurality of distribution holes 125 are provided, and the diameter d of the holes is gradually reduced from the inlet side toward the front end, so that the distribution of the heat medium 127 is made uniform. However, these measures increase the number of parts of the heat exchanger and also complicate the assembly. 7 and 8, reference numeral 1
Reference numerals 17 and 126 indicate fins.

A first object of the present invention is to provide a heat medium flow pipe in which a heat medium flows inside and a fluid which exchanges heat with the heat medium passes outside, so that the heat medium can easily flow into the heat medium flow pipe and the flow resistance can be reduced. It is small and heat transfer efficiency is improved.

[0007] A second object of the present invention is to provide a heat exchanger having a plurality of the heat medium flow pipes, wherein the heat medium flows uniformly.
Flow resistance is small, heat exchange efficiency is improved, and assembly is easy and economical.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a heat medium flow pipe having a predetermined length through which a heat medium flows and a fluid which exchanges heat with the heat medium passes outside. That is, at least one end is opened obliquely. Since the end portion is opened obliquely, the opening surface becomes large, the inflow of the heat medium becomes easy, the flow resistance is small,
And the heat transfer efficiency is improved.

[0009] A plurality of heat medium flow pipes having a predetermined length and provided in parallel with each other, wherein the heat medium flows through the inside and the fluid which exchanges heat with the heat medium passes through the outside, and An inflow pipe provided on one end side of the plurality of heat medium flow pipes and distributing the inflowing heat medium to the plurality of heat medium flow pipes, and the other end side of the plurality of heat medium flow pipes; And a collecting outlet pipe for collecting and discharging the heat medium flowing through the plurality of heat medium flow pipes, wherein the heat medium flow pipe is the heat medium flow pipe, An obliquely open surface of one end of the heat medium flow pipe is directed to a direction facing a direction in which the heat medium flows into the inflow pipe.

[0010] By turning one opening surface of the heat medium flow pipe in a direction opposite to the flowing direction of the heat medium in the inflow pipe, the heat medium can collide with the opening surface and change the flow direction. It becomes easier, and the heat medium is even (equal) in a plurality of heat medium flow pipes due to both effects of pressure difference and collision.
Distributed to Therefore, this heat exchanger has a low flow resistance and improves heat exchange efficiency. Since one end of the heat medium flow pipe is inclined and pointed, the end of the heat medium flow pipe is easily inserted into the inflow pipe, so that assembly is easy and economical.

Further, in the above heat exchanger, the heat medium flow pipe has an open surface whose other end is obliquely opened,
The opening face is oriented in the same direction as the direction in which the heat medium in the collecting outlet pipe flows out. By directing the other opening surface of the heat medium flow pipe in the same direction as the direction in which the heat medium flows out, the heat medium flows out at the other end in addition to the effect of the opening at one end. The flow resistance is more reliably reduced, and the heat exchange efficiency is improved. In addition, assembly becomes easier.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a heat medium flow pipe according to the present invention and a heat exchanger provided with the same will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a heat medium flow pipe according to the present invention, wherein (A) is a front view, (B) is a bottom view,
(C) is a sectional view taken along line II of (A). The tube 2 which is the heat medium flow pipe of the present embodiment has a predetermined length L, and the heat medium flows through the inner hole 5, and air (fluid) that exchanges heat with the heat medium passes outside. . The one end 3 and the other end 6 open diagonally, and open surfaces 4 and 7 are formed.
Having. Here, the opening surface 4 and the opening surface 7 are opposite to each other, that is, if the opening surface 4 is obliquely downward in the drawing, the opening surface 7 is obliquely upward.

The tube 2 of the present embodiment has an oblique opening surface at both ends, but may have only one end 3 at one end. Further, as shown in FIG. 1 (A), the directions of the opening surfaces are obliquely provided on one side and the other side so as to be opposite to each other. There may be a case where it is provided obliquely on the same side, or a case where the opening surface of one end and the opening surface of the other end are twisted at a certain angle. In short, the direction of the opening surface is optimally set according to the direction in which the heat medium flows.

The cross section of the tube 2 is a rectangular hollow cross section as shown in FIG. The hollow portion 5 is divided into a rectangular shape, a wavy shape, or the like as necessary, and forms a plurality of flow passages.
The cross-sectional shape is not limited to a rectangular hollow cross section, but may be a square hollow cross section, a circular hollow cross section, or another cross section.

The tube 2 having such a structure has its open end faces 4, 6 formed by opening its ends 3, 6 at an angle.
By increasing the cross-sectional area of 7, the inflow of the heat medium becomes easier, the flow resistance is reduced, and the heat transfer efficiency is improved.

FIG. 2 shows a first embodiment having a plurality of tubes 2.
It is a sectional view showing the heat exchanger of an embodiment. The heat exchanger 1 according to the first embodiment includes a plurality of tubes 2, an inlet header tank 9 serving as an inflow pipe provided on one end 3 side of the tubes 2, and the other end of the tubes 2. An outlet header tank 13 which is a collective outflow pipe provided on the 6th side is provided. The inlet header tank 9 distributes the incoming refrigerant 19 to the plurality of tubes 2, and the outlet header tank 13
The refrigerant 19 flowing through the plurality of tubes 2 is collected and discharged.

Further, the plurality of tubes 2 each have a predetermined length L, and a heat medium, for example, a refrigerant 19 circulates inside, and is provided in parallel at a fixed interval D to each other. Tube 2
Fins 17 are provided between them, and air (fluid) passes through a space formed by the tube 2 and the fins 17, and the refrigerant 19 and the heat exchange heat through the tubes 2 and the fins 17.

Further, in the heat exchanger 1 of the first embodiment, the opening surface 4 at one end of the tube 2 is oriented in a direction facing the direction in which the refrigerant 19 in the inlet header tank 9 flows. . The other end 6 also has an obliquely open opening surface 7, which is directed in the same direction as the direction in which the refrigerant 19 in the outlet header tank 13 flows out.

The header tanks 9 and 13, the tubes 2, the fins 17 and the like constituting the heat exchanger 1 are made of aluminum or aluminum alloy. In particular, the header tanks 9 and 13 and the tube 2 are extruded members, and the fins 17 are formed from a plate member. In addition, it is usual that the components are assembled by brazing after assembly, but in this case, it is convenient to attach a brazing material to at least one of the joining members.

The heat exchanger 1 of the first embodiment having the above structure operates as follows. That is, the refrigerant 19 flows into the inlet header tank 9 from the inlet pipe 11. here,
By turning the opening surface 4 at one end of the plurality of tubes 2 in a direction facing the direction in which the refrigerant 19 flows,
The refrigerant 19 collides with the opening surface 4 to easily change the flow direction thereof, and the refrigerant 19 is uniformly (uniformly) applied to each of the plurality of tubes 2 by the effects of both the pressure difference and the collision.
Distributed to As described in the description of the related art, when the refrigerant 19 is distributed solely based on the pressure difference, the distribution of the refrigerant is uneven if there is an uneven distribution of the pressure. And the effect of the collision allows for a more even distribution.

Further, by directing the opening surface 7 at the other end in the same direction as the direction in which the refrigerant 19 in the outlet header tank 13 flows out, the refrigerant 19 can easily flow out also at the other end 6, and the flow of the refrigerant 19 can be improved. Resistance is more reliably reduced. Then, the refrigerant 19 collected in the outlet header tank 13 flows out of the outlet pipe 15. As described above, in the heat exchanger 1 of the first embodiment, the refrigerant 19 flows uniformly in each tube 2, and therefore, the flow resistance of each tube 2 itself and the heat exchanger as a whole is reduced, and the heat exchange is performed. Efficiency is improved.
Moreover, it is easy to assemble and economical.

In FIG. 2, the heat exchanger 1 is shown with the tubes 2 arranged in the vertical direction in the drawing, but the heat exchanger of the present embodiment is arranged vertically or horizontally. It can be applied also in the form.

FIG. 3 is a sectional view showing a second embodiment similar to FIG. The heat exchanger 1 of the second embodiment has an opening surface 7 in which the other end 6 of each tube 2 is opened obliquely.
The opening surface 7 is oriented in a direction opposite to a direction in which the refrigerant 19 in the outlet header tank 13 flows out.
Even in such an orientation, the heat exchanger 1 has an improved heat exchange capability as described later. 3 that have the same structure and operation as those of FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 is a sectional view showing a third embodiment similar to FIG. In the heat exchanger 1 according to the third embodiment, the other end 6 of each tube 2 has an opening surface 7 a perpendicular to the longitudinal direction of the tube 2. This heat exchanger 1
Also, similarly to the heat exchanger of the second embodiment, the heat exchange capacity is improved. 4, the same reference numerals are given to the same portions having the same structure and operation as those in FIG. 2, and the description thereof will be omitted.

FIG. 5 is a comparison curve diagram of the cooling capacity of the heat exchanger 1 of the first to third embodiments and the heat exchanger 100 of the prior art. The horizontal axis indicates the ventilation volume (m ³ / h), and the vertical axis indicates the cooling capacity (kcal / h). The curve 21 plotted with the symbol △ is the heat exchanger 1 of the first embodiment in FIG. 2, and the curve 22 plotted with the symbol ◇ is the heat exchanger 1 of the second embodiment in FIG. Curve 23 corresponds to the third curve in FIG.
Heat exchanger 1 of the embodiment, curve 2 plotted with symbol □
4 shows each cooling capacity (kcal / h) of the heat exchanger 100 of the prior art of FIG.

The cooling capacity (curves 21, 22, 23) of the heat exchanger 1 of the first to third embodiments is higher than the cooling capacity (curve 24) of the heat exchanger 100 of the prior art. As in the heat exchanger 1 of the first embodiment, the opening surface 4 of the tube 2 faces the direction of the refrigerant, and the opening surface 7 faces the direction of the refrigerant. I can do it. Like the heat exchanger 1 of the second embodiment, even if the opening surface 7 is oriented in the direction opposite to the direction of the refrigerant, the cooling capacity can be considerably improved as shown by a curve 22, and the third embodiment is further improved. Even if the opening surface 7a is made the same as the heat exchanger 100 of the prior art as in the heat exchanger 1 in the
As shown in (2), the cooling capacity can be considerably improved.

[0028]

According to the heat medium flow pipe of the present invention, the flow of the heat medium is easy, the flow resistance is small, and the heat transfer efficiency is improved.

Further, according to the heat exchanger of the present invention, the heat medium flows uniformly in each heat medium flow pipe, the flow resistance is small, the heat exchange efficiency is improved, and the heat exchanger is easy to assemble and is economical.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a heat medium flow pipe according to the present invention, wherein (A) is a front view, (B) is a bottom view, and (C) is (A).
FIG. 2 is a sectional view taken along line II of FIG.

FIG. 2 is a sectional view showing a first embodiment of the heat exchanger according to the present invention.

FIG. 3 is a sectional view showing a second embodiment similar to FIG. 2;

FIG. 4 is a sectional view showing a third embodiment similar to FIG. 2;

FIG. 5 is a comparison curve diagram of the cooling capacity of the heat exchanger.

FIG. 6 is a cross-sectional view showing one example of a heat exchanger according to the related art.

FIG. 7 is an explanatory diagram showing another example similar to FIG. 6;

8 is a cross-sectional view of a principal part showing still another example similar to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube (heat medium flow pipe) 3 One end 4 Opening surface 6 The other end 7 Opening surface 9 Inlet header tank (inflow piping) 13 Outlet header tank (collective outflow pipe) 19 Refrigerant (heat) Medium) 20 Air (fluid)

Claims (3)

[Claims] 1. A heat medium flow pipe having a predetermined length through which a heat medium flows inside and a fluid that exchanges heat with the heat medium passes outside, at least one end of the heat medium flow pipe is obliquely opened. Heat medium flow pipe. 2. A heat medium flows through the inside, a fluid that exchanges heat with the heat medium passes through the outside, and has a predetermined length.
A plurality of heat medium flow pipes provided in parallel with each other, and an inflow pipe provided on one end side of the plurality of heat medium flow pipes for distributing the flowing heat medium to the plurality of heat medium flow pipes And, a heat exchanger provided with a collective outflow pipe provided on the other end side of the plurality of heat medium flow pipes and collecting and flowing out the heat medium flowing through the plurality of heat medium flow pipes, The heat medium flow pipe is according to claim 1,
A heat exchanger, characterized in that an obliquely open surface of one end of the heat medium flow pipe is oriented in a direction facing a flow direction of the heat medium in the inflow pipe. 3. The heat medium flow pipe according to claim 2, wherein the other end of the heat medium flow pipe has an obliquely open opening surface, and the opening surface has the same direction as the direction in which the heat medium flows out of the collective outflow pipe. A heat exchanger characterized by being directed to