JP2005164210A - Heat exchanger, multiple pipe for use in the device, and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an innovative multiple pipe type heat exchanger that can be installed in a limited space by ensuring low cost fixation of a multiple pipe, such as a double pipe, for the heat exchanger, and enabling a compact form, and can reduce a heating surface and heat exchanger scale by increasing heat exchanger efficiency; and a manufacturing method of a multiple pipe such as a double pipe. <P>SOLUTION: The heat exchanger uses the multiple pipe, such as a double pipe, comprising an inner pipe and an outer pipe, as a condenser, an evaporator or the like. Either of the inner pipe and outer pipe of the multiple pipe such as a double pipe is formed to a noncircular section such as an elliptical one. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchanger in which a conventional concept is changed by improving a structure and a manufacturing method, a multiple tube used in the apparatus, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, in a heat exchanger used for a condenser or an evaporator such as an air conditioner or a water heater, a double tube heat exchanger including an inner tube and an outer tube is widely used.

  However, the conventional double tube heat exchanger has problems such as lack of certainty of positioning and fixing between the inner tube and the outer tube, and a difficult processing method.

  For example, in the first example shown in FIG. 14, there is one in which a part of the outer cylinder is fixed by a concave portion 11 that is recessed in the inner cylindrical direction, but there is a risk of stress concentration in the concave portion 11.

  Further, in the second example shown in FIG. 15, there is one in which the outer wall of the inner cylinder is fixed to the inner wall of the outer cylinder by the brazing part 12, but there is a risk of damage to the brazing part 12 due to thermal stress.

  Further, in the third example shown in FIG. 16, there is one in which the fixing bracket 13 is inserted and fixed between the inner tube 4 and the outer tube 5, but there is a problem that the cost increases due to the necessity of the fixing bracket 13. It was.

  Furthermore, in the conventional example, there are problems such as complicated production, high cost, vibration of the heat exchanger, and difficulty in bending after the double pipe is manufactured.

  Further, in the fourth example shown in FIG. 17, a turbulent coil is provided in the annular portion in order to prevent local boiling of the fluid flowing through the annular portion formed between the inner tube 4 and the outer tube 5 and the rising noise. 14 are also provided, but other illustrations are omitted, but there are also those provided with an inner pipe or a net-like body. This causes a severe turbulence in the fluid, thereby improving the heat transfer coefficient. JP-A-58-33091 and JP-A-5-187787 have disclosed double-pipe heat exchangers for the purpose of saving heat and reducing the size of the heat exchanger and further improving the heat exchange efficiency. Seen in.

  However, with the arrangement of the turbulent coil, the inner pipe, and the net-like body, it has been difficult to reliably position the inner pipe within the outer pipe.

Further, as shown in FIGS. 18 and 19, as a heat exchanger of a refrigeration circuit, a method of arranging two pipes in parallel and joining them with silver solder or a method of joining by seam welding is disclosed in Japanese Patent Laid-Open No. 2001-2481979. Although proposed, there are problems such as poor heat exchange efficiency and high cost for welding for joining.
JP 58-33091 A Japanese Patent Laid-Open No. 5-187787 JP 2001-248979 A

  The present invention is to reliably fix a multi-pipe such as a double pipe of a heat exchanger at a low cost, and to make it possible to form a multi-pipe such as the double pipe in a compact manner. Innovative multi-tube heat exchangers and double pipes such as double pipes that can be installed in the volume, improve heat exchanger efficiency, save heat transfer surface, and reduce the size of heat exchangers To provide a manufacturing method.

  Furthermore, the present invention eliminates the need for an inner pipe, a turbulent coil, and a net for preventing local boiling and boiling noise of the fluid flowing through the annular portion, which has been a problem with conventional heat exchangers. The present invention is to provide a manufacturing method of a multi-pipe such as a multi-pipe heat exchanger and a double pipe.

  In order to achieve the above-mentioned object, the multi-tube heat exchanger of the present invention has two or more concentrically arranged pipes in which an outer pipe is pressed against an inner pipe over a partial to full length. A multi-tubular heat exchanger can be obtained by deforming and fixing to a non-circular shape such as an elliptical cross section or an oval shape.

  Further, a compact multi-tube heat exchanger can be obtained in which the multi-tube is wound in an S shape or a spiral to reduce the size.

  In addition, since the present invention can be bent in an arc shape, a multiple tube heat exchanger in which heat exchange efficiency is improved by winding the multiple tubes in a spiral and double triple is obtained.

  As described above, according to the present invention, a multi-tube heat exchanger such as a double-tube type having a specific cross-sectional shape is formed. Therefore, a multi-tube type heat exchange such as a double-tube type that has improved the conventional problems. The device is obtained and has the following effects.

That is,
As described above, according to the present invention, the specific shape and the specific processing method are used, and therefore, the following excellent effects are obtained.
(1) According to the present invention, since the processing method is simple, not only can a multi-tube heat exchanger such as a double-tube type be manufactured easily, but the manufacturing cost can be greatly reduced. There is an effect that can be done.
(2) According to the present invention, since the processing method is simple, not only a simple multi-tube such as a straight line or a U-shape, but also a multi-tube heat exchanger having a complicated shape such as a spiral or spiral is easy. There is an effect that it can be manufactured.
(3) According to the present invention, a multi-tube having a complicated shape can be processed, so that a multi-tube shape such as a spiral shape or a spiral shape can be obtained, and a compact multi-tube heat exchanger is easily manufactured. There is an effect that can be.
(4) According to the present invention, since heat dissipation can be prevented, the heat transfer coefficient is improved to save the heat transfer surface and to reduce the size of the heat exchanger, and to further improve the heat exchange efficiency. There is an effect that a tubular heat exchanger can be obtained.
(5) According to the present invention, since the heat distribution of the inner pipe is excellent, a multiple pipe that prevents local boiling and boiling noise without requiring an insert such as an inner pipe, a turbulent coil, or a net-like body. There is an effect that a shape heat exchanger can be obtained.

  The present invention relates to a heat exchanger according to the present invention, a multiple tube used in the apparatus, and a method for manufacturing the same, and particularly to a heat exchanger used in a condenser, an evaporator, etc., and an inner tube widely used. A multi-pipe such as a double pipe composed of an outer pipe and an outer pipe is improved, and the cross section of either the inner pipe or the outer pipe of the multi-pipe such as the double pipe is non-circular such as an oval or an oval A heat exchanger using a multi-tube such as a double tube formed in a non-circular shape such as an oval or an oval, and a method for producing a multi-tube such as the double tube Is.

  In the present invention, the cross section of either the outer tube or the inner tube of the multiple tube such as the double tube is formed in a non-circular shape such as an elliptical shape or an oval shape.

  Furthermore, in the present invention, the cross section of the full length or a part of the length of the multiple tube such as the double tube is formed in a non-circular shape such as an elliptical shape or an oval shape.

  Further, according to the present invention, the cross section of the bent pipe portion such as the U-shaped tube, the S-shaped tube, or the bent tube is formed in a non-circular shape such as an oval shape or an oval shape, so that the cross section is an oval shape or an oval shape. A length of a part of a multiple tube such as a double tube formed in a non-circular shape is formed.

  Further, according to the present invention, these non-circular shapes such as an ellipse or an oval cross section are formed by holding the inner wall of the outer tube and the outer wall of the inner tube in pressure contact with each other.

  In addition, the inner tube or the outer tube of a multiple tube such as a double tube having an oval or oval cross section in the present invention is manufactured as follows.

  For example, in a multi-pipe such as a double pipe composed of an inner pipe and an outer pipe used in a heat exchanger, the outer side of the outer pipe of the multi-pipe such as the double pipe is directed inward from the opposite direction. By pressing with a pressure roller, the outer tube can be formed into a non-circular shape such as an elliptical shape or an oval shape.

  The multi-pipe such as the double pipe thus manufactured is formed into a non-circular shape such as an ellipse or an oval shape by pressing the inner wall of the outer pipe and the outer wall of the inner pipe by the roller pressurization or the like. As a result, even if an external force such as vibration or swinging is applied, they are held and formed without moving.

  Next, the heat exchanger according to the present invention, the multiple tube used in the apparatus, and the manufacturing method thereof will be described in detail by the following examples.

1 and 2 show a first example of a multiple tube used in the heat exchanger of the present invention,
As shown in FIG. 1, of the two tubes in which the outer tube 5 is concentrically disposed outside the inner tube 4, the outer tube 5 is pressed by means such as pressure contact, and the cross section thereof is as shown in FIG. 2. The inner wall of the outer tube 5 and the outer wall of the inner tube 4 are in pressure contact with each other by deforming them into a non-circular shape such as an ellipse or an oval shape to form a pressure contact portion 3 in which the two are in pressure contact with each other. By being formed, the double pipe 2 used for the heat exchanger is formed.

3-5 shows the 1st example of the manufacturing method of the heat exchanger and multiple tube | pipe of this invention,
Two pipes in which the outer pipe 5 is concentrically arranged outside the inner pipe 4 are parallel straight straight pipe sections 6 (FIGS. 3 and 5) in which the inner pipe 4 and the outer pipe 5 are circular pipes. A heat exchanger 1 is formed which is formed in a double pipe 2 having a continuous U-shape or S-shape composed of a curved pipe section 7 (FIGS. 3 and 4) for connecting the straight pipe section 6. Here, a is a heat medium or refrigerant, and b is a heat exchange medium.

  The double pipe 2 has a parallel straight pipe section 6 formed in a circular pipe (FIGS. 3 and 5), and a curved pipe section 7 for connecting the straight pipe section 6 to the outer pipe 5 by means such as pressure welding. The cross section is deformed into a non-circular shape such as an ellipse or an oval shape as shown in the cross section of FIG. 4 (FIGS. 3 and 4), and the inner wall of the outer tube 5 and the outer wall of the inner tube 4 are in pressure contact with each other. 3 and forming a double pipe 2 in which both are held together, a heat exchanger 1 having the double pipe 2 is formed (FIGS. 3 to 5).

The manufacturing method of the above-mentioned double pipe 2 is that the inner pipe 4 is inserted into the outer pipe 5 and is pressed against the inner cylinder 4 by pressing the outer pipe 5 with two mechanical rollers or hydraulic rollers. At the same time, using a bending roller, it is wound around a cylindrical roller in a cylindrical shape, and the cross-section is deformed into a non-circular shape such as an oval or an oval as shown in the cross-sectional view of FIG.
The straight pipe portion 6 is fed in a cylindrical shape without applying hydraulic pressure, the cross-section is kept circular as shown in the cross-sectional view of FIG. 5, and the next curved pipe portion 7 is again pressed in the same manner as the outer pipe 5. While being rolled into a cylindrical shape, the cross section is deformed into a non-circular shape such as an ellipse or an oval as shown in the cross-sectional view of FIG.
By repeating this process, the heat exchanger 1 having the double pipe 2 is formed by forming and processing the double pipe 2 having a continuous U-shape or S-shape.

6-8 shows the 2nd example of the manufacturing method of the heat exchanger of this invention, and a multiple tube,
While the outer tube 5 is concentrically disposed on the outer side of the inner tube 4, the outer tube 5 is pressed against the inner tube 4 by pressing with two rollers such as a mechanical roller and a hydraulic roller, and simultaneously bending is performed. It consists of a series of curved pipe parts 7 whose cross section is deformed into a non-circular shape such as an oval or an oval as shown in the cross-sectional view of FIG. The double pipe 2 of the spiral shape 8 is formed by machining, and the heat exchanger 1 having the double pipe 2 is formed.

9 and 10 show a third example of the heat exchanger and multi-tube manufacturing method of the present invention,
While the outer tube 5 is concentrically disposed outside the inner tube 4, the outer tube 5 is pressed against the inner tube 4 by pressing with two rollers such as a mechanical roller and a hydraulic roller, and simultaneously bending is performed. Using a roller, a cylindrical roller is wound into a spiral shape 8 consisting of a continuous bent tube portion 7, and processed.
Furthermore, by similarly winding and processing the spiral shape 8, the cross section is deformed into a non-circular shape such as an elliptical shape or an oval shape as shown in the sectional view of FIG.
By forming and processing the double spiral double tube 2, the heat exchanger 1 having the double spiral 8 double tube 2 is formed.

FIGS. 11-13 shows the 4th example of the manufacturing method of the heat exchanger and multiple tube | pipe of this invention,
With the outer tube 5 outside the inner tube 4 and the cylindrical heat insulating material 9 concentrically disposed outside the outer tube 5, the heat insulating material 9 and the outer tube 5 are connected to two mechanical rollers, Insulating material by being pressed into the inner cylinder 4 by pressing with a roller such as a hydraulic roller and simultaneously wound into a spiral shape 8 consisting of a continuous bent tube portion 7 with a cylindrical roller using a bending roller. The cross section of the outer tube 5 and the outer tube 5 are deformed into a non-circular shape such as an ellipse or an oval shape as shown in the cross-sectional view of FIG. 13 to form a triple tube 10 having a spiral shape 8 and covered with a heat insulating material 9. A heat exchanger 1 having a triple tube 10 is formed.

  As the heat insulating material 9, glass fiber, foamed polyurethane, foamed silicone, foamed polyethylene, foamed polystyrene or the like is used.

  According to the present invention, the heat transfer coefficient can be improved by preventing heat dissipation and the heat exchange efficiency can be improved by reducing the heat transfer surface, so that the heat exchanger can be reduced in size, so that a household water heater, water heater, air conditioner, etc. Therefore, the heat exchanger can be made compact.

  Furthermore, according to the present invention, since the heat distribution of the inner tube is excellent, a multi-tube type that prevents local boiling and boiling noise without requiring an insert such as an inner pipe, a turbulent coil, or a net-like body. A heat exchanger can be obtained.

  Further, according to the present invention, it is possible to simultaneously perform the bending process of the outer tube 5 and the inner tube 4 and the deformation process of making the cross section of the outer tube 5 and the inner tube 4 non-circular such as an ellipse or an oval shape. The multiple tubes for heat exchangers can be made compact, the application range of the heat exchangers can be widened, and it can be used for floor heating and cooling / heating devices.

It is a perspective view which shows the multiple tube of this invention. (Example 1) It is sectional drawing of the multiple tube of FIG. It is a front view which shows the heat exchanger using the multiple tube of this invention, and a multiple tube manufacturing method. (Example 2) It is BB sectional drawing of the multiple tube of FIG. It is AA sectional drawing of the multiple tube of FIG. It is a front view which shows the heat exchanger using the multiple tube of this invention, and a multiple tube manufacturing method. Example 3 FIG. 7 is a plan view of FIG. 6. It is CC sectional drawing of the multiple tube of FIG. It is a front view which shows the heat exchanger using the multiple tube of this invention, and a multiple tube manufacturing method. (Example 4) FIG. 10 is a plan view of FIG. 9. It is a front view which shows the manufacturing method of the heat exchanger which uses the multiple tube of this invention, and a multiple tube. (Example 5) It is a top view of FIG. It is DD sectional drawing of the multiple tube of FIG. It is a perspective view which shows the multiple tube which carried out the concave fixing of a part of conventional outer tube | pipe. It is a perspective view which shows the multiple tube which brazed the conventional outer tube and the inner tube. It is a perspective view which shows the multiple tube fixed with the conventional fixing metal fitting. It is a perspective view which shows the multiple tube | pipe which inserted the conventional special coil. It is a front view which shows the conventional helical multiple tube. FIG. 20 is a side view of FIG. 19.

Explanation of symbols

1 Heat exchanger 2 Double pipe (Multiple pipe)
3 pressure contact part 4 inner pipe 5 outer pipe 6 straight pipe part 7 curved pipe part 8 spiral 9 heat insulating material 10 triple pipe (multiple pipe)
11 Concave portion 12 Brazed portion 13 Fixing bracket 14 Turbulent coil a Heating medium or refrigerant b Heat exchange medium

Claims (12)

In multiple tubes such as double tubes consisting of inner and outer tubes used in heat exchangers,
The cross section of either the inner tube or the outer tube of the multiple tube such as the double tube is formed in a non-circular shape such as an elliptical shape or an oval shape.
A multiple tube used for a heat exchanger characterized by that. The cross section is formed into a non-circular shape such as an ellipse or an oval.
It is an outer tube of a multiple tube such as the double tube,
The multiple pipe used for the heat exchanger of Claim 1 characterized by the above-mentioned. The cross section is formed into a non-circular shape such as an ellipse or an oval.
It is an inner tube of a multiple tube such as the double tube,
The multiple pipe used for the heat exchanger of Claim 1 characterized by the above-mentioned. The cross section is formed into a non-circular shape such as an ellipse or an oval.
The total length of multiple tubes such as the double tube,
The multiple pipe used for the heat exchanger of Claim 1 characterized by the above-mentioned. The cross section is formed into a non-circular shape such as an ellipse or an oval.
A length of a part of a multiple tube such as the double tube,
The multiple pipe used for the heat exchanger of Claim 1 characterized by the above-mentioned. The length of a part of a multiple tube such as a double tube formed in a non-circular shape such as an ellipse or an oval in cross section is a bent tube part such as a U-shaped tube, an S-shaped tube, or a bent tube.
The multiple pipe used for the heat exchanger of Claim 5 characterized by the above-mentioned. The multiple pipes such as double pipes whose cross section is formed in a non-circular shape such as an ellipse or an oval are formed by holding the inner wall of the outer pipe and the outer wall of the inner pipe in pressure contact with each other.
The multiple tube used for the heat exchanger in any one of Claims 1-6 characterized by the above-mentioned. In heat exchangers where multiple pipes such as double pipes consisting of inner and outer pipes are used in condensers and evaporators,
Multiple pipes such as double pipes in which the cross section of either the inner pipe or the outer pipe is formed in a non-circular shape such as an ellipse or an oval are used in condensers, evaporators, etc.
A heat exchanger characterized by that. A multiple tube such as a double tube in which the cross section of either the inner tube or the outer tube is formed into a non-circular shape such as an oval or an oval,
It is used for multiple pipes such as double pipes with U-shaped and S-shaped continuous pipes and curved pipes.
The heat exchanger according to claim 8. A multiple tube such as a double tube in which the cross section of either the inner tube or the outer tube is formed in a non-circular shape such as an oval or an oval,
Used for multiple pipes such as a spiral double pipe consisting of a series of curved pipe parts,
The heat exchanger according to claim 8. In a multiple tube such as a double tube composed of an inner tube and an outer tube used in a heat exchanger, from the opposite direction of the outer tube of the multiple tube such as the double tube toward the inside, By pressing with a pressure roller or the like, the outer tube is formed into a non-circular shape such as an oval or an oval,
For manufacturing a multi-tube used in a heat exchanger In a multiple tube such as a double tube made up of an inner tube and an outer tube used in a heat exchanger, a pressure roller from the opposite direction of the outer tube of the multiple tube such as a double tube toward the inside Pressing with a roller such as to deform the cross section into a non-circular shape such as an ellipse or oval,
At the same time, it is wound into a cylindrical shape using a bending roller and formed into a double tube 2 with a continuous U-shape, S-shape, etc.
For manufacturing a multi-tube used in a heat exchanger

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