JPH0639244Y2 - Heat exchanger pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pipe of a heat exchanger used for an air conditioner of an automobile or the like.

(Prior Art) In a heat exchanger of an air conditioner, as shown in FIG. 8, a refrigerant flows from one pipe A into a flat tubular tube B to another pipe C, and then from the pipe C to a tube B. It flows in a meandering manner through the pipe to the pipe A, and pressure is applied to the refrigerant during that time to forcibly dissipate the heat and the refrigerant becomes a low-temperature and high-pressure cooling liquid. The heat released at this time is transferred to the tubes B, transferred to the corrugated fins D provided between the tubes B, and dissipated by the air blown to the corrugated fins D.

The two pipes A and C of this heat exchanger have the same structure, and both have a partition plate E as shown in FIGS.
It is divided in the longitudinal direction by. The refrigerant sent out from the pipe A on the left side of FIG.
The refrigerant supplied to the pipes C on the right side from the tubes B is sent to the tubes B in the lower three stages, and the refrigerant sent back from the tubes B to the pipes A in the lower three stages. It is sent to the tubes B, and is made to flow while meandering in the many tubes B. Usually, the number of tubes B in each stage is decreased as it goes to the lower stage, so that the refrigerant that is liquefied and becomes harder to flow than gas becomes easier to flow toward the lower stage.

The conventional pipe A has a tube B on its peripheral wall as shown in FIG.
A tube insertion hole J into which the refrigerant partition plate E is inserted and a partition plate insertion hole K into which the refrigerant partition plate E is inserted are formed. However, since the pipe A has a perfect circular cross-sectional shape, if the tube insertion hole J is formed by pressing or the like, the same insertion hole J
There is a problem that the pipe A is deformed due to the depression of the peripheral part of the pipe A, the internal volume is changed and the flow rate of the refrigerant becomes unstable, and it becomes difficult to insert the tube B into the tube insertion hole J. .

Therefore, the present inventor previously devised a pipe A having an elliptical cross section as shown in FIG. 9 and applied for a utility model registration. In this pipe A, a tube insertion hole J and a partition plate insertion hole K are formed in a large curved surface portion H of the elliptical shape having a large curved surface,
The partition plate L is inserted into the partition plate insertion hole K as shown in FIG. 9, and the tube B is inserted into the tube insertion hole J as shown in FIG. In this way, even if the tube insertion hole J is formed by pressing or the like, the peripheral edge portion of the insertion hole J is unlikely to be dented, so that the tube B can be easily inserted into the tube insertion hole J.

(Problems to be solved by the invention) However, a pipe A having an elliptical cross section as shown in FIG. 9 is a continuous body (continuous pipe) in which a large curved surface portion H having a large curved surface and a small curved surface portion I having a small curved surface are formed in series. Therefore, when a high pressure is applied to the refrigerant flowing therein, the large curved surface portion H bulges outward and is easily deformed. Moreover, if such deformation occurs, the internal volume of the pipe A changes and the flow rate of the refrigerant becomes unstable, or a gap is formed between the tube insertion hole J and the tube B inserted therein due to the deformation, and from there, There is a problem that the refrigerant may leak.

(Object of the Invention) The object of the present invention is to provide a pipe for a heat exchanger in which a tube can be easily inserted, is not easily deformed even when a high-pressure refrigerant is flowed, its internal volume is not easily changed, and the refrigerant is not likely to leak. is there.

(Means for Solving the Problem) In the heat exchanger pipe of the present invention, as shown in FIG. 2, the tube B is inserted into each of the two or more tube insertion holes 3 formed in the two opposed pipes 1. Tube B that is inserted and adjacent
In the pipe of the heat exchanger in which the corrugated fins D are arranged and fixed between the pipes, the cross-sectional shape of the pipe 1 is an ellipse in which a large curved surface portion 5 and a small curved surface portion 8 are formed in series, and the pipe 1 is small. The curved portion 8 is formed with a deformed portion 4 formed by projecting the peripheral wall 2 outward or inward along the longitudinal direction of the pipe 1.

(Operation) As shown in FIG. 1, the pipe for heat exchanger of the present invention is a pipe 1
Has an elliptical shape in which a large curved surface portion 5 and a small curved surface portion 8 are formed in series, and a deformed portion 4 formed by projecting the peripheral wall 2 outward or inward is formed on the small curved surface portion 8 of the pipe 1. Since it is formed along the longitudinal direction of the pipe 1, the tensile and compressive strength of the peripheral wall in the vertical direction is higher than that of a pipe having the same inner volume and a perfect circular or elliptical cross section.
This is because the tensile and compressive stress concentrates on the portion having the largest strain, that is, the deformed portion 4, and the stress applied to other portions is reduced. Therefore, in the heat exchanger pipe of the present invention, the pipe 1 is not easily deformed even when a high-pressure refrigerant is flowed, and even if the tube insertion hole 3 and the partition plate insertion hole 4 are formed in the peripheral wall 2 of the pipe 1, the same insertion hole 3 is formed. The peripheral portion is less likely to be dented.

(Embodiment 1) FIG. 1 is a first embodiment of a heat exchanger pipe of the present invention. The pipe 1 has a large curved surface portion 5 having a large curved surface and a small curved surface portion 8 having a small curved surface formed in series to form an elliptical cross section. Both small curved surface portions of the peripheral wall 2 of the pipe 1 at opposite positions. Deformation part 4 in which peripheral wall 2 is projected outward
Are formed. The deformed portion 4 is a small curved surface portion 8 of the peripheral wall 2.
It is formed by crushing the meat on the outside of the and projecting it to the outside. The deformed portion 4 is formed over the entire length of the pipe 1 in the longitudinal direction. Further, a tube insertion hole 3 is formed in one large curved surface portion 5 of the peripheral wall 2 of the pipe 1 facing each other, and a partition plate insertion hole 6 is formed in the other large curved surface portion 5 by press working or the like.

(Embodiment 2) FIG. 3 is a second embodiment of the heat exchanger pipe of the present invention. The pipe 1 has a deformed portion 4 formed by projecting the peripheral wall 2 to the outside on one small curved surface portion 8 of the two small curved surface portions 8 at opposite positions of the peripheral wall 2. The deformed portion 4 is also formed by crushing the meat on both outer sides of the peripheral wall 2 and projecting it outward. The deformed portion 4 is also formed over the entire length of the pipe 1 in the longitudinal direction.

(Embodiment 3) FIG. 4 shows a third embodiment of the heat exchanger pipe of the present invention. Of the two small curved surface portions 8 of the peripheral wall 2 facing each other, the pipe 1 has a deformed portion 4 formed on one of the small curved surface portions 8 with the peripheral wall 2 protruding outward. The deformed portion 4 is also formed by crushing the meat on both outer sides of the peripheral wall 2 and projecting it outward. In this case, the flesh of the peripheral wall 2 is crushed so as to be superposed and projected outward.

(Embodiment 4) FIG. 5 is a fourth embodiment of the heat exchanger pipe of the present invention. This pipe 1 is formed by pushing inwardly the meat of two small curved surface portions 8 at opposite positions on the peripheral wall 2 of the pipe 1 to form a deformed portion 4.

(Other Embodiments) The shape of the deformable portion 4 in the present invention may be other than that shown. The deformed portion 4 is not formed in series over the entire length in the longitudinal direction of the pipe 1 as shown in FIG. 1, but is not formed near the partition plate 7 where the internal pressure of the refrigerant is less likely to be applied, as shown in FIG. You may form intermittently only in the part of the insertion hole 3.

(Example of use) To use the pipe of the present invention, as shown in FIG.
The tube B is inserted into the tube insertion hole 3 and the partition plate 7 is inserted into the partition plate insertion hole 6, and the corrugated fins D are arranged and fixed between the adjacent tubes B to fix the pipe 1, the partition plate 7, the tube B and the corrugated gate. The fins D are brazed to form the heat exchanger. In this case, it is convenient to apply the brazing material to the brazing portions of the pipe 1, the partition plate 7 and the tube B in advance, and melt the brazing material by heating the pipe 1 so that the brazing material is brazed. is there.

(Effect of the Invention) In the pipe for heat exchanger of the present invention, the cross-sectional shape of the pipe 1 is an elliptical shape in which the large curved surface portion 5 and the small curved surface portion 8 are formed in series, and the peripheral wall of the small curved surface portion 8 of the pipe 1 is formed. Since the deformed portion 4 formed by projecting 2 toward the outside or inside is formed along the longitudinal direction of the pipe 1, the following various effects are obtained.

． Since the tensile and compressive strength of the peripheral wall 2 of the pipe 1 in the vertical direction is increased, the pipe 1 is unlikely to be deformed even when a high-pressure refrigerant is flown into the pipe 1, and the internal volume thereof is not changed. Further, there is no fear that the refrigerant will leak due to the deformation.

． When the tube insertion hole 3 and the partition plate insertion hole 6 are formed in the peripheral wall of the pipe 1, the peripheral edge portions thereof are less likely to be recessed, and the tube B is easily inserted into those insertion holes.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a heat exchanger pipe of the present invention, FIG. 2 is an explanatory view of an automobile heat exchanger using the pipe, and FIGS. 3 to 6 are heat exchangers of the present invention. Explanatory sectional views showing other various examples of the exchanger pipe, FIG. 7 is an assembly explanatory diagram of a heat exchanger using a conventional heat exchanger pipe, and FIG. 8 shows a refrigerant flow in the same heat exchanger. Explanatory drawing, FIG. 9 is an exploded view of a heat exchanger pipe developed prior to the pipe of the present application, and FIG. 10 is an assembly explanatory view of the same pipe. 1 is a pipe 2 is a peripheral wall 3 is a tube insertion hole 4 is a deformed portion

Claims (1)

[Scope of utility model registration request] 1. A heat exchange in which a tube B is inserted into each of two or more tube insertion holes 3 formed in two opposing pipes 1, and corrugated fins D are arranged and fixed between adjacent tubes B. In the pipe of the container, the cross-sectional shape of the pipe 1 is an ellipse in which a large curved surface portion 5 and a small curved surface portion 8 are formed in series, and the peripheral wall 2 is projected outward or inward from the small curved surface portion 8 of the pipe 1. A heat exchanger pipe, characterized in that the deformed portion 4 thus formed is formed along the longitudinal direction of the pipe 1.