JP2001239316A - Pipe and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide pipes having good heat transfer performances and hardly causing out-of-contact phenomena. SOLUTION: In pipes used in the heat transfer among fluids preparing prural passeges divided with walls, element pipes forming prural passeges, are characterized by close contact in a state of being twisted together like a spiral and covered on the outer surface of these pipes by reinforcing pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe provided with a plurality of flow paths divided by walls and having improved heat transfer performance between fluids flowing through the plurality of flow paths, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in the field of heat exchangers, a heat transfer tube having a plurality of flow paths divided by walls has been known. Such a heat transfer tube was used for heat exchange between the refrigerant and the water, for example, by flowing a refrigerant through a certain flow path and flowing water through a flow path adjacent to the flow path of the refrigerant. .

[0003] As a conventional pipe of this type, for example, a pipe described in Japanese Patent Application Laid-Open No. 11-221615 has been proposed.

[0004] The pipes described in the above publications are in close contact with each other in a state where a plurality of element pipes are helically twisted, and the outer surface has a circular cross-sectional shape.

[0005]

According to the above-described method of manufacturing a pipe, a plurality of raw pipes are prepared, these raw pipes are twisted, and the twisted raw pipes are drawn so as to have a circular outer shape. I was

However, since the above-mentioned pipe has a structure in which two pipes are twisted, the close contact between the two pipes may be deteriorated due to thermal expansion and contraction or pressure change.

Therefore, the present invention has been made in consideration of the above points,
An object of the present invention is to provide a tube having good heat transfer performance and in which poor adhesion is unlikely to occur.

[0008]

In order to solve the above-mentioned problems, the present invention according to claim 1 is directed to a pipe for heat transfer between fluids having a plurality of flow paths divided by a wall. It is characterized in that the pipes forming the passage are closely attached to each other in a spirally twisted state, and the outer surfaces of these pipes are covered with a reinforcing pipe.

The invention according to claim 2 is characterized in that a groove for assisting heat transfer is formed on the inner surface of the raw tube.

The invention according to claim 3 is characterized in that the cross-sectional shape of the outer surface of the twisted tube is circular.

According to a fourth aspect of the present invention, at least two raw tubes are prepared, these raw tubes are twisted, and the twisted raw tubes are drawn to make the raw tubes adhere to each other. It is characterized in that a reinforcing pipe is brought into close contact with the outer surface of these twisted element pipes by drawing.

According to a fifth aspect of the present invention, at least two raw pipes are prepared, these raw pipes are twisted, and the twisted raw pipes are drawn to make the raw pipes adhere to each other. The outer surface of the twisted element pipe is coated with a reinforcement pipe, and the element pipe is brought into close contact with the reinforcement pipe by hydraulic expansion.

According to a sixth aspect of the present invention, at least two raw pipes are prepared, these raw pipes are twisted, and the outer surface of the twisted raw pipes is coated with a reinforcing pipe. It is characterized in that it is brought into close contact with the reinforcing pipe by hydraulic expansion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory perspective view of a tube showing an embodiment of the present invention.

FIG. 1 shows a tube 1 having a structure in which two element tubes 3 are helically twisted, the outer surface of which is covered with a reinforcing tube 4, and these element tubes 3 and the reinforcing tube 4 are brought into close contact with each other. It is.

These pipes 3 form two helical flow paths divided by a wall, and the fluid flowing through the two flow paths becomes turbulent, thereby giving good heat transfer characteristics between the fluids. Can be done.

Further, even if a high pressure is applied to the fluid flowing through the inside of the raw tube 3, since the outer surface thereof is reinforced by the reinforcing tube which is coated and adhered to the outer surface, the pressure can be sufficiently withstood.

The base tube 3 may have a groove (not shown) formed on its inner surface to promote heat transfer of a fluid flowing inside.

The material of the raw tube 3 is a metal such as copper or a soft resin which resists deformation after processing.

Next, a method of manufacturing the pipe 1 having the above-described configuration will be described.

FIG. 2 is an explanatory perspective view of a tube 2 in which two raw tubes 3 are twisted, showing an embodiment of the present invention. FIG. 3 is a perspective explanatory view of a pipe 2A obtained by twisting two raw pipes 3 and drawing out the pipes according to the embodiment of the present invention.

In the first embodiment of the method of manufacturing the tube 1, first, two raw tubes 3 are prepared. In this case, two pipes 3
Can use an ordinary cylindrical tube.

Then, as shown in FIG. 2, the raw tubes 3 are twisted with each other to form the tubes 2. At this point, the adhesion between the base tubes 3 may not be so strong.

Further, the twisted tube 2 is drawn using a die. This drawing is performed, for example, such that the cross-sectional shape of the outer surface of the drawn tube 2A is substantially circular as shown in FIG.

At this point, the base tube 3 has been deformed into a base tube 3A having a substantially semicircular cross section as shown in FIG. 3, and is firmly adhered to each other through the wall portions 3AA that abut against each other. .

Further, the outer surface of the drawn tube 2A is covered with a reinforcing tube 4, and the reinforcing tube 4 is brought into close contact with the base tube 3 by drawing to complete the tube 1.

As a second embodiment of the method of manufacturing the tube 1, first, two raw tubes 3 are prepared.

Then, as shown in FIG. 2, the raw tubes 3 are twisted with each other to form the tubes 2.

Further, the twisted tube 2 is drawn using a die. This drawing is performed, for example, such that the cross-sectional shape of the outer surface of the drawn tube 2A is substantially circular as shown in FIG.

Further, the outer surface of the pipe 2A, which has been twisted and drawn, is covered with a reinforcing pipe 4, and the raw pipe 3A of the pipe 2A is coated.
Is brought into close contact with the reinforcing pipe 4 by hydraulic expansion, whereby the pipe 1 is completed.

At this time, the jig is placed on the outer surface of the reinforcing tube 4 or an external pressure is applied, so that the reinforcing tube 4 becomes substantially circular.

As a third embodiment of the method of manufacturing the tube 1, first, two raw tubes 3 are prepared.

Then, as shown in FIG. 2, the raw tubes 3 are twisted with each other to form the tubes 2.

Further, the pipe 1 is completed by bringing the twisted pipes 3 into close contact with the reinforcing pipe 4 by hydraulic expansion.

At this time, the jig is placed on the outer surface of the reinforcing tube 4 or an external pressure is applied, so that the reinforcing tube 4 becomes substantially circular.

The above three methods can be appropriately selected and carried out according to various conditions such as material and thickness.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, by increasing the number of pipes 3,
The heat transfer area can be increased.

[0039]

As described above, according to the first aspect of the present invention, a plurality of flow paths are formed in a pipe which is provided with a plurality of flow paths divided by a wall and is involved in heat transfer between fluids. Pipes are closely attached to each other in a spirally twisted state,
In addition, since the outer surfaces of these base tubes are covered with the reinforcing tubes, it is possible to provide a tube that has good heat transfer performance and hardly causes poor adhesion.

According to the second aspect of the present invention, since a groove for assisting heat transfer is formed on the inner surface of the raw tube, a tube having good heat transfer performance and less occurrence of poor adhesion can be provided.

According to the third aspect of the present invention, the cross section of the outer surface of the twisted tube is circular,
A tube having good heat transfer performance and less likely to cause poor adhesion can be provided.

According to the fourth aspect of the present invention, at least two raw tubes are prepared, these raw tubes are twisted, and the twisted raw tubes are drawn together to bring the raw tubes into close contact with each other. In addition, by bringing the reinforcing tube into close contact with the outer surface of the twisted element tube by drawing, it is possible to provide a tube having good heat transfer performance and less likely to cause poor adhesion.

According to the fifth aspect of the present invention, at least two raw pipes are prepared, these raw pipes are twisted, and the twisted raw pipes are drawn to bring the raw pipes into close contact with each other. In addition, by covering the outer surface of the twisted tube with a reinforcing tube and bringing the tube into close contact with the reinforcing tube by hydraulic expansion, a method for producing a tube having good heat transfer performance and less occurrence of poor adhesion is provided. Can be provided.

According to the invention of claim 6, at least two raw tubes are prepared, these raw tubes are twisted, and the outer surface of the twisted raw tubes is covered with a reinforcing tube, and By bringing the pipe into close contact with the reinforcing pipe by hydraulic expansion, it is possible to provide a method of manufacturing a pipe that has good heat transfer performance and does not easily cause poor adhesion.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a tube showing an embodiment of the present invention.

FIG. 2 is a perspective explanatory view of a pipe obtained by twisting two element pipes according to the embodiment of the present invention.

FIG. 3 is a perspective explanatory view of a pipe obtained by twisting two element pipes and further drawing out the same according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 pipe 2 pipe 2A pipe (after processing) 3 raw pipe 3A raw pipe (after processing) 3AA wall part 4 reinforcement pipe

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Yoshinori Toya 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Hideaki Mukaida 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Masahiro Kobayashi 2-5-5, Keihanhondori, Moriguchi-shi, Osaka 2-5 Sanyo Electric Co., Ltd. (72) Shigeya Ishigaki 2, Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. F term (reference) 4E028 EA01 EA04 4E096 EA19 FA01

Claims (6)

[Claims] 1. A pipe having a plurality of flow paths divided by a wall, the pipe being involved in heat transfer between fluids flowing through the plurality of flow paths,
A pipe, wherein the pipes forming the plurality of flow paths are helically twisted and closely adhered to each other, and a reinforcing pipe is coated and adhered to the outer surface of the pipes. 2. The tube according to claim 1, wherein a groove for assisting heat transfer between the fluids is formed on an inner surface of the tube. 3. The pipe according to claim 1, wherein a cross-sectional shape of an outer surface of the reinforcing pipe is substantially circular. 4. A method of twisting a plurality of base tubes, drawing the twisted base tubes together so that the base tubes are in close contact with each other, and covering an outer surface of the base tubes with a reinforcing tube by drawing. A method for producing a pipe, comprising bringing the pipe into close contact. 5. A method of twisting a plurality of base tubes and drawing the twisted base tubes so as to bring the base tubes into close contact with each other, and covering an outer surface of the base tubes with a reinforcing pipe, A method for manufacturing a pipe, wherein the pipe is brought into close contact with the reinforcing pipe by hydraulic expansion. 6. A method for preparing a plurality of base tubes, twisting the base tubes, and coating a reinforcing tube on an outer surface of the base tubes,
A method for manufacturing a pipe, comprising: bringing these raw pipes into close contact with each other by hydraulic expansion, and also making close contact with the reinforcing pipe.