JPH116U - Heat exchanger pipes - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Because the push-in portion is pushed inward from the top of the curved surface of the pipe and the cross-sectional shape between the tube insertion holes 3 is a dome shape, the deformation length of the push-in portion becomes long, and the push-in portion becomes large. It is easily pushed back by the high-pressure refrigerant flowing in the pipe. SOLUTION: The pipe 1 is a pipe in which an outer peripheral surface is formed into an arc surface in a circumferential direction by combining two half pipes, or a pipe in which an outer peripheral surface is formed into an arc surface in a circumferential direction in advance, and the peripheral wall of the arc surface Of the tube insertion holes, the long side edge of the tube insertion hole is pressed into the inside of the pipe to form an insertion guide portion that projects inward, and the top portion that is a circular arc surface in the circumferential direction between the insertion guide portions of the adjacent tube insertion holes is It was kept flat in the axial direction of the pipe without being pushed inside the pipe.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pipe for a heat exchanger used in an air conditioner of a car or the like.

[0002]

[Prior art]

 As shown in FIG. 3, the refrigerant condenser (heat exchanger) of the air conditioner passes the refrigerant from one pipe A through the flat tube B to the other pipe C, and further from the pipe C into the tube B. And flows longitudinally to the pipe A through which the refrigerant is pressurized to radiate heat by forcing the refrigerant into a low-temperature and high-pressure coolant. The heat released at this time is transmitted to the tube B, transmitted to the long corrugated fins (hereinafter referred to as fins) D disposed between the adjacent tubes B, and radiated by the air sent to the fins D. It is to be done. As shown in FIG. 4, a number of tube insertion holes E for inserting a tube B are formed in the pipe A by pressing, and after the tube B is inserted into the tube insertion hole E, the tube is inserted into the tube A. B and the periphery of the insertion hole E and the fin D are soldered and fixed, and the refrigerant does not leak from the insertion hole E. As shown in FIG. 4, this pipe A is so formed that its peripheral edge is greatly depressed during the press working of the insertion hole E so that the peripheral wall between the adjacent tube insertion holes E becomes a dome shape (arc shape). The tube B was easily inserted into the insertion hole E.

[0003]

[Problems to be solved by the invention]

 However, in the conventional heat exchanger pipe, as shown in FIG. 4, the space between adjacent tube insertion holes E in the peripheral wall is of a dome shape (arc shape). The surface is supported at one point on the arc surface of the peripheral wall of the pipe A. For this reason, the fin D is likely to be displaced between the time when the fin D is disposed between the tubes B and when the fin is brazed, or the heat transfer coefficient from the pipe A to the fin D is poor, so that the heat exchanger There is a problem that the overall heat radiation efficiency is low.

[0004]

[Means for Solving the Problems]

 An object of the present invention is to provide a pipe for a heat exchanger in which tubes can be easily inserted, fins disposed between the tubes are not easily displaced before brazing, and heat radiation efficiency is high.

[0005] In the heat exchanger pipe of the present invention, the tubes B are inserted into and adjacent to the tube insertion holes 3 formed at arbitrary intervals in the longitudinal direction of the peripheral wall 2 of the pipe 1 as shown in FIG. In the pipe 1 of the heat exchanger in which the meandering fins D are arranged between the tubes B, as shown in FIG. 1B, on the peripheral edge of the tube insertion hole 3 of the peripheral wall 2, on the side of the tube insertion hole 3. A curved insertion guide portion 8 is formed, and the top 4 between the insertion guide portions 8 of the adjacent tube insertion holes 3 is formed flat so that the longitudinal end face d of the fin D can make surface contact. .

In the heat exchanger pipe of the present invention, as shown in FIG. 1, an insertion guide portion 8 that curves toward the tube insertion hole 3 is formed at the peripheral edge of the tube insertion hole 3 in the peripheral wall 2. The tube B is easily guided into the tube insertion hole 3 by being guided by the insertion guide portion 8. Further, since the top portions 4 between the insertion guide portions 8 of the adjacent tube insertion holes 3 are formed flat so that the longitudinal end surfaces d of the fins D can make surface contact, the fins D between the adjacent tubes B are formed. Are arranged, both end faces d in the longitudinal direction of each fin D come into surface contact with the top 4. Therefore, the fins D arranged between the tubes B are stabilized, and the fins D are less likely to be displaced before being brazed to the pipe 1. Further, since each fin D comes into surface contact with the top portion 4, the heat transfer coefficient from the pipe 1 to the fin D is improved.

[0007]

First Embodiment of the Invention FIG. 1 is an embodiment of a heat exchanger pipe of the present invention. In FIG. 1, reference numeral 1 denotes a pipe, and a laterally long tube insertion hole 3 into which a flat tubular tube B is inserted is formed in a peripheral wall 2 of the pipe 1 at an arbitrary interval in a longitudinal direction thereof by press working or the like. It becomes. The peripheral edge of the insertion hole 3 is largely depressed during press working of the insertion hole 3 to form an insertion guide portion 8 for guiding the tube B inserted into the insertion hole 3. 1 (a) and 1 (b) are top portions 4 between the insertion guide portions 8 of the adjacent tube insertion holes 3 in the peripheral wall 2, and the top portions 4 are clearly shown in FIG. 1 (b). It is formed flat. The flat top portion 4 is for supporting the both ends d in the longitudinal direction of each fin D arranged between the adjacent tubes B in surface contact. In order to flatten the top 4, for example, when the tube insertion hole 3 is pressed, pressing can be performed at the same time as pressing the tube insertion hole 3. It can also be formed by pressing. Although the top 4 shown in FIGS. 1 (a) and 1 (b) is narrower than the width of the horizontally long tube insertion hole 3, it can be wider. The shape of the insertion hole 3, the insertion guide portion 8 and the top portion 4 is formed into an assembly type pipe 1 composed of a half-shaped main body 6 and a lid 7 as shown in FIG. (Japanese Utility Model Application No. 63-171253). In the present invention, the tube B is inserted into the tube insertion hole 3, the fin D is arranged between the adjacent tubes B, and the pipe 1, the tube B and the fin D are soldered to form a heat exchanger. In this case, if a brazing material is applied in advance to each of the brazing portions of the pipe 1, the tube B, and the fin D, and when the pipe 1 is heated, the brazing material is melted and brazed. It is convenient.

[0008]

[Effect of the invention]

 The heat exchanger pipe of the present invention has the following effects. . Since the insertion guide portion 8 that curves toward the tube insertion hole 3 is formed at the periphery of the tube insertion hole 3, the tube B is easily guided into the tube insertion hole 3 by being guided by the insertion guide portion 8. . . Since the tops 4 between the insertion guide portions 8 of the adjacent tube insertion holes 3 are formed flat so that the longitudinal end faces d of the fins D can make surface contact, the fins D are arranged between the adjacent tubes B. Then, both end faces d in the longitudinal direction of the fins D come into surface contact with the apex 4, and the fins D arranged between the tubes B are stabilized, and the fins D are displaced before being joined to the pipe 1. It becomes difficult to do. . Since the fins D are in surface contact with the tops 4, the heat transfer coefficient from the pipe 1 to the fins D is improved, and the cooling efficiency of the entire heat exchanger is improved. . Although the tops 4 of the pipes 1 are formed flat, the strength of the pipes 1 due to the pressure of the refrigerant flowing through the pipes 1 is less deteriorated than the case where the tops 4 are simply flattened due to the insertion guide 8.

[Submission date] April 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents] [Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pipe for a heat exchanger used in an air conditioner of a car or the like.

[0002]

[Prior art]

As shown in FIG. 4 , the refrigerant condenser (heat exchanger) of the air conditioner passes the refrigerant from one pipe A through the flat tubular tube B to the other pipe C, and further from the pipe C into the tube B. And flows longitudinally to the pipe A through which the refrigerant is pressurized to radiate heat by forcing the refrigerant into a low-temperature and high-pressure coolant. The heat released at this time is transmitted to the tube B, transmitted to a long corrugated fin (hereinafter referred to as a fin) D disposed between the adjacent tubes B, and radiated by the air sent to the fin D. It is so. As shown in FIG. 5, a plurality of tube insertion holes E for inserting a tube B are formed in the pipe A by press working. After the tube B is inserted into the tube insertion hole E, the tube B is inserted. B and the periphery of the insertion hole E and the fin D are soldered and fixed, and the refrigerant is prevented from leaking from the insertion hole E. As shown in FIG. 4 , this pipe A is so formed that the peripheral edge thereof is greatly depressed at the time of press working of the insertion hole E so that the peripheral wall between the adjacent tube insertion holes E has a dome shape (arc shape). The tube B was easily inserted into the insertion hole E.

[0003]

[Problems to be solved by the invention]

However, in the conventional heat exchanger pipe, since inter among adjacent tubing insertion hole E of the wall as shown in FIG. 5 is a domed (arcuate), longitudinal both end surfaces of the fins D disposed between the tube B is The contact area of the peripheral wall of the pipe A with the arc surface is reduced. For this reason, the fin D is likely to be displaced between the time of placing the fin D between the tubes B and brazing, or the heat transfer coefficient from the pipe A to the fin D is poor, and the heat of the entire heat exchanger is radiated. There was a problem of low efficiency. Further, as shown in FIG. 6 for a domed wall pipe A immediately becomes inwardly pushed Rukoto from the curved top part H of the pipe A, the pushing length of the push portion M, i.e., from the curved top H deformation length L (FIG. 6) is long, easily pushing portion M is pushed back by the high-pressure refrigerant flowing in the pipe a, it is easy cracks enters the brazed portions due to vibration or the like, pushing portion M is deformed It will be easier.

[0004]

[Means for Solving the Problems]

 An object of the present invention is to provide a heat exchanger pipe in which tubes can be easily inserted, fins arranged between the tubes are not easily displaced before brazing, brazing is reliable and strong, and heat radiation efficiency is high. is there.

In order to achieve the above object, the pipe for a heat exchanger of the present invention is provided with a plurality of horizontally long tube insertion holes 3 formed at arbitrary intervals in the longitudinal direction of the peripheral wall 2 of the pipe 1 as shown in FIG. The pipe 1 for a heat exchanger in which the tubes B are inserted and the meandering fins D are arranged between the adjacent tubes B, a pipe having an outer peripheral surface formed into a circular arc surface in a circumferential direction by combining two half pipes, or a pipes in advance the outer peripheral surface is formed in a circular arc face in the circumferential direction, the inner long sides periphery 10 of the oblong tube insertion hole 3 of the wall 2 of the circular arc face in I pushed inside the pipe 1 The top portion 4 which is a circular arc surface in the circumferential direction between the insertion guide portions 8 of the adjacent tube insertion holes 3 is formed to be flat in the axial direction of the pipe 1 without being pushed into the inside of the pipe 1. As it is.

In the heat exchanger pipe of the present invention, as shown in FIG. 1, the long side edge 10 of the tube insertion hole 3 of the peripheral wall 2 is pushed into the tube insertion hole 3 side (inside) so as to be curved. Since the insertion guide portion 8 protruding inward is formed, the tube B is easily guided into the tube insertion hole 3 by being guided by the insertion guide portion 8. Further, since the circumferential direction between the insertion guide portion 8 of the tube insertion hole 3 to fit adjacent the top 4 is an arc face are to remain flat in the axial direction of the push First, the pipe 1 inside the pipe 1, adjacent fit tube B fins D have contact area wider than the longitudinal If the opposite end faces d Ru into contact with Doitadaki 4 5 fins D to place is stabilized between, until the pipe 1 and the brazing Each fin D is less likely to be displaced . Further, when each fin D is brought into contact with the top 4, the heat transfer coefficient from the pipe 1 to the fin D is improved.

[0007]

FIG. 1 shows an embodiment of a heat exchanger pipe according to the present invention. The pipe 1 has an arcuate outer circumferential surface in a circumferential direction, and a laterally long tube insertion hole 3 into which a flat tubular tube B is inserted at an arbitrary interval in the longitudinal direction is formed on the circumferential wall 2 of the arcuate surface by press working. formed by more formed. The long side peripheral portion 10 of the arc surface of the tube insertion hole 3 is pushed into the inside of the pipe 1 at the time of press working of the tube insertion hole 3 to form an insertion guide portion 8 which is largely recessed and protrudes inward. Become. The insertion guide portion 8 is for guiding the tube B inserted into the tube insertion hole 3 and for forming a low pool. The top 4 which is a circular arc surface in the circumferential direction between the insertion guide portions 8 of the adjacent tube insertion holes 3 is not pushed into the inside of the pipe 1 but is pushed in the axial direction of the pipe 1 as clearly shown in FIG. It remains flat. For FIG. 1 (a), are shorter than the length of the tube insertion hole 3 a length in the circumferential direction of the flat top 4, but can in the practice of wider than, for example, peripheral it can be formed over the direction the entire length. The pipe 1 of the present invention is constructed by assembling a half-shaped main body 6 and a lid 7 as shown in FIG. 2 filed by the inventor of the present invention (Japanese Utility Model Application No. 63-171253), and forming an outer peripheral surface in a circular arc in the circumferential direction. It may be a prefabricated pipe with a surface. In this case, the tube insertion hole 3, the insertion guide 8, and the top 4 are formed in the lid 7 . To use the heat exchanger pipe of the present invention is inserted a tube B into the tube insertion hole 3 of the pipe 1, after placing the fins D between the upper and lower of the adjacent tube B, pipes 1 and tube B and the fins D To form a heat exchanger. In this case, it is convenient to apply a brazing material to the brazing portions of the pipe 1, the tube B and the fin D in advance, and to heat the pipe 1 so that the brazing material is melted and brazed.

[0008]

[Effect of the invention]

The heat exchanger pipe of the present invention has the following effects. . Since the insertion guide portion 8 that curves toward the tube insertion hole 3 is formed at the periphery of the tube insertion hole 3, the tube B is easily guided into the tube insertion hole 3 by being guided by the insertion guide portion 8. . . Since the tops 4 of the arc surfaces between the insertion guide portions 8 of the adjacent tube insertion holes 3 are flat, the contact area between the longitudinal end surfaces d of the fins D arranged between the adjacent tubes B and the same tops 4 is large. As a result, the fins D arranged between the tubes B are stabilized, and the fins D are less likely to be displaced before being brazed to the pipe 1. Further , the heat transfer coefficient from the pipe 1 to the fins D is improved, and the cooling efficiency of the entire heat exchanger is improved. . The flat top 4 of the insertion guide portion 8 formed on the long side peripheral portion 10 of the horizontally long tube insertion hole 3 so as to protrude inside the pipe 1 has both ends of the top 4 as shown in FIG. a, the pressing length, that is, the deformation length L (FIG. 3) from the both ends a of the top 4 becomes shorter. Even Thus insertion guide portion 8 shed 50~60Kg as high refrigerant into pipes 1, whereby the difficulty pushed back no longer becomes difficult to deform. Moreover, because of the short deformation length L of the insertion guide portion 8, the depression (low reservoir between when brazing the tube B plugged into tubing insertion hole 3, a tube B and the insertion guide portion 8 as shown in FIG. 3 row R flowing into) the reservoir to the extent that substantially flush with the flat top 4, become firmly brazing injury the tube B and the pipe 1, insertion guide portion 8 of the pipe 1 to be deformed by the high-pressure refrigerant Ku Kunar.

[Brief description of the drawings]

1A is a front view showing an embodiment of a heat exchanger pipe of the present invention, and FIG. 1B is a longitudinal sectional view of FIG.

FIG. 2 is an assembly explanatory view showing another embodiment of the heat exchanger pipe of the present invention.

FIG. 3 is an explanatory diagram of a heat exchanger.

FIG. 4 is an explanatory sectional view showing a conventional heat exchanger pipe.

[Explanation of symbols]

 1 is a pipe 2 is a peripheral wall 3 is a tube insertion hole 4 is a top

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[Procedure amendment]

[Submission date] April 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Name of device] Pipe for heat exchanger

[Utility model registration claims]

[Brief description of the drawings]

1 (a) is a front view showing an embodiment of a heat exchanger pipe of the present invention, and FIG. 1 (b) is a longitudinal sectional view of FIG. 1 (a).

FIG. 2 is an assembly explanatory view showing another embodiment of the heat exchanger pipe of the present invention.

FIG. 3 is a view showing a brazed state of the heat exchanger pipe of the present invention .
Clear view.

FIG. 4 is an explanatory diagram of a heat exchanger .

FIG. 5 is an explanatory sectional view showing a conventional heat exchanger pipe.
You .

FIG. 6 is an explanation of a brazed state of the heat exchanger pipe of FIG . 5;
FIG .

[Description of Signs] 1 Pipe 2 Perimeter wall 3 Tube insertion hole 4 Top 8 Insertion guide section 10 Long side edge of tube insertion hole

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

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FIG. 2

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

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FIG. 3

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

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FIG. 4

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Added

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FIG. 5

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Added

[Correction contents]

FIG. 6

Claims (1)

[Utility model registration claims] A tube (B) is inserted into each of tube insertion holes (3) formed at arbitrary intervals in a longitudinal direction of a peripheral wall (2) of a pipe (1), and adjacent tubes (B) are inserted. In the pipe (1) of the heat exchanger in which meandering fins (D) are arranged between the tube insertion holes (3) in the peripheral wall (2) at the periphery of the tube insertion hole (3).
An insertion guide portion (8) that curves to the side is formed, and the top end (4) between the insertion guide portions (8) of the adjacent tube insertion holes (3) faces the longitudinal end surface (d) of the fin (D). A heat exchanger pipe characterized by being formed flat so as to be able to contact.