JP2011163655A - Method of manufacturing torsion pipe type heat exchanger and the torsion pipe type heat exchanger manufactured in the manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a torsion pipe type heat exchanger capable of suppressing decline in performance and quality caused by variation of the height of spiral mountains of a torsion pipe serving as an inner pipe and excessive torsion and of reducing labor, time and device cost for evaluation of performance and quality, and the torsion pipe type heat exchanger manufactured in the manufacturing method. <P>SOLUTION: The method of manufacturing the torsion pipe type heat exchanger includes: a process of forming a plurality of the spiral mountains 1b and grooves 1c on a pipe wall of the inner pipe 1 by applying torsion treatment to the inner pipe 1 serving as a water pipe; a process of contracting an outer pipe 2 so that tops of the spiral mountains 1b of the inner pipe 1 are brought into close contact with an inner wall of the outer pipe 2 after the inner pipe 1 is inserted to the outer pipe 2 serving as a refrigerant pipe and of forming a double pipe having a spiral refrigerant flow passage 2a between the inner pipe 1 and the outer pipe 2; and a process of bending the double pipe to a predetermined dimension. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a manufacturing method of a torsion tube heat exchanger for exchanging heat between water and a refrigerant, and in particular, a manufacturing method of a double tube heat exchanger including an inner tube serving as a water tube and an outer tube serving as a refrigerant tube, and its The present invention relates to a twisted tube heat exchanger manufactured by a manufacturing method.

  Conventionally, as a method for manufacturing a twisted tube heat exchanger, particularly a double-tube heat exchanger comprising an inner tube serving as a water tube and an outer tube serving as a refrigerant tube, two tubes having different diameters (inner tube) , An outer tube), and a method of twisting the inner tube with the inner tube inserted into the outer tube is known (for example, see Patent Document 1).

JP 2003-329376 A (Summary, FIG. 2)

  However, in the above-described conventional method, when the inner pipe is twisted, a refrigerant formed between the spiral groove of the inner pipe and the outer pipe depending on the completion of the twisting process, such as a variation in the height of the helix. There is a case where the flow path is integrated with the refrigerant flow path adjacent in the tube axis direction without being separated. In this case, since the refrigerant does not flow along the spiral groove but flows linearly in the tube axis direction, the heat exchange performance decreases. Furthermore, if the twisting process is excessively performed so that the spiral crest of the inner pipe is brought into close contact with the inner wall of the outer pipe, the inner pipe may be twisted too much and the flow path may be blocked, thereby reducing the performance and quality. Further, since the inner tube is covered with the outer tube, it cannot be confirmed from the appearance that the inner tube flow path is blocked. Means such as measuring the pressure loss of the inner pipe are effective for confirming whether or not the inner pipe flow path is blocked, but this requires apparatus costs and labor.

  The present invention has been made to solve the above-mentioned problems, and it has been found that the height of the spiral crest of the torsion pipe serving as the inner pipe varies, and the performance and quality deterioration due to over-torsion are suppressed. It is an object of the present invention to provide a method for manufacturing a twisted tube heat exchanger capable of reducing labor and apparatus costs for the manufacturing, and a twisted tube heat exchanger manufactured by the manufacturing method.

  A method for manufacturing a torsion tube heat exchanger according to the present invention includes a step of twisting an inner tube serving as a water tube to form a plurality of spiral ridges and grooves on a tube wall of the inner tube, After being inserted into the outer pipe that becomes the refrigerant pipe, the outer pipe is contracted so that the top of the spiral crest of the inner pipe is in close contact with the inner wall of the outer pipe, and the spiral refrigerant flow path between the inner pipe and the outer pipe And a step of bending the double tube into a predetermined dimension.

  According to the present invention, after the inner pipe serving as the water pipe is twisted to form a plurality of spiral ridges and grooves on the inner pipe wall, the inner pipe is inserted into the outer pipe serving as the refrigerant pipe. Because the outer tube is contracted so that the top of the spiral crest of the inner tube is in close contact with the inner wall of the outer tube, the height of the spiral crest of the torsion tube that becomes the inner tube varies, and the performance due to over-torsion It is possible to suppress the quality degradation and reduce the labor and equipment cost for performance and quality evaluation.

It is process drawing which shows the manufacturing method of the twisted-tube heat exchanger which concerns on one embodiment of this invention. It is sectional drawing at the time of giving the torsion process to the inner pipe used as a water pipe in the manufacturing method of the twisted tube type heat exchanger which concerns on one embodiment of this invention. It is sectional drawing of the state which inserted the inner pipe used as a water pipe in the outer pipe used as a refrigerant pipe in the manufacturing method of the twisted tube type heat exchanger which concerns on one embodiment of this invention. It is sectional drawing which showed a mode that the outer tube | pipe after inserting an inner tube | pipe in the manufacturing method of the twisted tube type heat exchanger which concerns on one embodiment of this invention was contracted. In the manufacturing method of the twisted tube heat exchanger according to one embodiment of the present invention, after inserting the inner tube into the outer tube, the outer tube is contracted, and the spiral crest of the inner tube and the inner wall of the outer tube are in close contact with each other. It is sectional drawing which shows a mode that the refrigerant | coolant flow path is formed.

The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a process diagram showing a manufacturing method of a twisted tube heat exchanger according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the state where the inner pipe serving as the water pipe is twisted in the process of FIG. FIG. 3 is a cross-sectional view of the inner tube inserted into the outer tube. FIG. 4 is a cross-sectional view showing how the outer tube into which the inner tube is inserted is contracted. FIG. 5 is a cross-sectional view showing a state in which the spiral crest of the inner tube after the outer tube is contracted and the inner wall of the outer tube are in close contact with each other to form a spiral refrigerant flow path. 2 to 5 are sectional views cut along the tube axis of the inner tube.

  The double-pipe heat exchanger 4 using the torsion pipe according to the present embodiment is an inner pipe 1 serving as a water pipe and a refrigerant pipe disposed outside the inner pipe 1 as shown in FIGS. It has an outer tube 2 (circular tube). The inside of the inner tube 1 is a water flow path 1a, and the outer peripheral surface has a plurality of spiral peaks 1b and grooves 1c. The inner tube 1 thus configured is inserted into the outer tube 2, the outer tube 2 is contracted, and the top of the spiral crest 1 b of the inner tube 1 and the inner wall of the outer tube 2 are brought into close contact with each other. A spiral refrigerant flow path 2 a is formed between the outer pipe 2 and the outer pipe 2.

  Next, the manufacturing method of the twisted tube heat exchanger which concerns on this Embodiment is demonstrated, referring FIGS. 2-5 based on FIG. First, the inner tube 1 is twisted to produce an inner tube 1 that becomes a water tube having a plurality of spiral ridges 1b and spiral grooves 1c (FIGS. 1A and 2). Next, the twisted inner tube 1 is inserted into the outer tube 2 having an inner diameter larger than the outer diameter of the inner tube 1 (FIGS. 1B and 3). Thereafter, until the top of the spiral crest 1b of the inner tube 1 is in close contact with the inner wall of the outer tube 2, the outer tube 2 is subjected to contraction processing, for example, with a contraction die 3 to form a double tube 4a (FIG. 1 (c, d), FIG. 4, FIG. 5). Thereafter, the double pipe 4a is bent so as to have a predetermined dimension, and the double pipe heat exchanger 4 is produced (FIG. 1 (e)).

  Thus, by contracting the outer tube 2 into which the inner tube 1 is inserted, the top of the spiral mountain 1b of the inner tube 1 and the inner wall of the outer tube 2 are brought into close contact with each other, and the spiral groove 1c of the inner tube 1 and the outer tube 2 is formed (FIGS. 3 to 5). Further, by adopting a system in which the outer tube 2 is contracted, even if the peak height of the spiral mountain 1b of the inner tube 1 after the twisting process varies, the helical mountain is inserted before the inner tube 1 is inserted into the outer tube 2. If the variation in the peak height of 1b is measured in advance, the outer tube 2 can be contracted as much as necessary according to the top of the spiral mountain 1b having the shortest peak height. For this reason, it can suppress that the refrigerant flow path 2a becomes integral with the refrigerant flow path 2a adjacent to the axial direction of the double pipe 4a. As a result, the refrigerant does not flow linearly in the direction of the tube axis and can flow spirally, so that it is possible to suppress a decrease in heat exchange performance.

  In addition, in the present embodiment, the outer tube 2 is contracted when the top of the spiral crest 1b of the inner tube 1 is brought into close contact with the inner wall of the outer tube 2, so that excessive twisting is performed as in the prior art. It is impossible to do. For this reason, the inconvenience that the refrigerant flow path 2a is closed due to excessive twisting of the inner tube 1 can be prevented. Therefore, it is not necessary to take measures such as measuring pressure loss for confirming the presence or absence of blockage, and the apparatus cost and labor can be reduced.

  1 inner pipe (water pipe), 1a water flow path, 1b spiral mountain (twist mountain), 1c spiral groove, 2 outer pipe (refrigerant pipe), 2a refrigerant flow path, 3 contraction die, 4 double pipe heat exchanger, 4a Double tube.

Claims (2)

A step of twisting the inner pipe to be a water pipe to form a plurality of helical peaks and grooves on the pipe wall of the inner pipe;
After the inner tube is inserted into the outer tube serving as the refrigerant tube, the outer tube is contracted so that the spiral crest of the inner tube is in close contact with the inner wall of the outer tube, and between the inner tube and the outer tube. Forming a double pipe having a spiral refrigerant flow path;
And a step of bending the double pipe into a predetermined dimension.   A twisted tube heat exchanger manufactured by the manufacturing method according to claim 1.

Images