JP2590250Y2 - Heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly, to a heat exchanger which is inexpensive and has good heat conductivity.

[0002]

2. Description of the Related Art Conventionally, as a double tube of a heat exchanger, for example, a double tube described in Japanese Utility Model Laid-Open No. 64-22172 is described. In this heat exchanger, an inner tube made of titanium and a titanium alloy is fitted into a copper fin tube provided with a large number of fin members projecting radially inward in cross section, and both end portions of the fin tube and the inner tube are joined together. And a copper inlet joint having an inlet for the heat exchange medium and a copper outlet joint having an outlet for the heat exchange medium, each of which is welded and sealed in a bag shape. By the way, since the fin tube and the inlet / outlet side joint are both made of copper, the jointability by welding is good, but the inner tube and the inlet / outlet side joint are made of different materials of copper and titanium, so that the jointability is not good. Therefore, the inner pipe and the inlet / outlet side joint are welded to each other through a titanium copper clad. The titanium copper clad is expensive because it is manufactured by a special manufacturing method.

[0003]

However, conventionally, expensive titanium copper clad was used for joining the inner pipe and the inlet / outlet side joint as described above, and thus the use of this titanium copper clad is not suitable for the heat exchanger. Price was rising. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a heat exchanger that is inexpensive and has good heat conductivity.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The heat exchanger according to the present invention has a metal outer tube, a fin tube having both ends protruding from both ends of the outer tube, and a plurality of fin members provided in a radially cross-sectionally outwardly protruding state, An inlet / outlet side joint in which both ends of the outer tube and the fin tube can be welded or brazed in a sealed state, and further provided with an inlet portion and an outlet portion of a heat exchange medium, respectively;
An inner tube made of titanium or a titanium alloy provided with an inlet portion and an outlet portion of a fluid to be heat-exchanged at both ends, which are fitted in the fin tube in a tightly contacted state, and the outer tube, the fin tube, and The material of the entrance-side joint is one of copper and aluminum.

[0005]

In the heat exchanger according to the first aspect of the present invention, when the inner tube and the inlet / outlet side joint are joined to each other, the inner tube and the inlet / outlet side joint are connected to each other through a fin tube which can be welded or brazed because of the same material. By joining in close contact,
The inner tube and the inlet / outlet side joint can be satisfactorily joined without using an expensive titanium copper clad as in the conventional means, and the cost of the heat exchanger can be reduced. Further, the heat of the heat exchange medium flowing between the plurality of fin members and the outer tube reaches a heat transfer path from the inner peripheral surface of the fin tube to the inner tube, and reaches the inner tube from the fin member through the fin tube. The heat is transferred from the heat transfer path to the fluid flowing in the inner tube, but since the inner tube is tightly fitted inside the fin tube, the heat of the heat exchange medium spreads almost uniformly to the fin tube with little heat loss. It is transmitted to the fluid in the pipe. Therefore, good heat conductivity can be obtained, and effective heat exchange can be performed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings to facilitate understanding of the present invention. Here, FIG. 1 is an enlarged sectional view of a main part of the heat exchanger according to one embodiment of the present invention, FIG. 2 is an enlarged sectional view of the heat exchanger at a position S1-S1 in FIG. 1, and FIG. FIG. 4
(A) is a perspective view of the inner tube and the fin tube after pressure welding, FIG. 4 (b)
FIG. 3 is a perspective view of the fin tube in which the inner tube is fitted and the outer tube after pressure contact.

As shown in FIG. 3, the heat exchanger 10 according to one embodiment of the present invention is a long tube which is curved in a long hole shape in plan view. As shown in FIGS. 1 and 2, the heat exchanger 10 has an outer tube 11 made of copper. In the outer tube 11, a large number of flat fin members 12 project radially outward in cross section. A relatively thin aluminum fin tube 13 integrally molded is fitted inside. Both ends of the fin tube 13 project from both ends of the outer tube 11 as cylindrical portions 13a in which the fin member 12 is cut out.
It is slightly longer, and both ends protrude from both ends in the length direction of the fin member 12. The reason why the outer tube 11 is made slightly longer than the fin member 12 is that the aluminum fin member 12 having a low melting point is welded when welding both ends of the outer tube 11 and T joints 16 and 19 described later. This is to prevent melting and deformation due to heat at the time. Also,
An inner pipe 14 made of titanium, which is slightly longer than the fin pipe 13, is fitted in the fin pipe 13, and the openings at both ends of the inner pipe 14 have a seawater inlet 1 as an example of a fluid with which heat is exchanged.
4a and an outlet 14b (see FIG. 3).

Next, a method of manufacturing the tube portion of the heat exchanger 10 including the fin tube 13 and the inner tube 14 will be described with reference to FIG. 4. As shown in FIG. The inner tube 14 having a diameter slightly smaller than that of the fin tube 13 is inserted into the fin tube 13, and the fin tube 13 is pressed from the outside with a die (not shown) to reduce the diameter, thereby integrating the fin tube 13 and the inner tube 14. Next, as shown in FIG. 4B, the fin tube 13 integrated with the inner tube 14 is inserted into the outer tube 11 whose inner diameter is slightly larger than the diameter of a circle connecting the tips of the fin members 12. Similarly, the outer tube 11 is pressed from the outside with a die (not shown) to reduce the diameter, and the two tubes 11 and 13 are integrated while the inner peripheral surface of the outer tube 11 is pressed against the tip of the fin member 12 to heat the outer tube 11. The tube of the exchanger 10 is manufactured.

Returning to FIGS. 1 and 3, one end of a copper T-joint 16 provided with an inlet 15 for a refrigerant such as Freon gas as an example of a heat exchange medium is provided at one end of the outer tube 11 on one side. Are externally fitted, and the fin tube 1 is exposed to the T-joint 16 to the outside.
3 is connected to one cylindrical portion 13a by a reducer 17 made of copper. The end of the outer tube 11 on one side and the fin tube 13 are formed by the T joint 16 and the reducer 17.
The inlet side joint which welds the end part of this in a sealed state is comprised.
One end of a copper T-joint 19 from which the refrigerant outlet 18 protrudes upward is fitted to the end of the outer tube 11 on the other side, and the other end of the T-joint 19 and the fin tube 13 that is exposed to the outside. The cylindrical portion 13a is connected by a reducer 20 made of copper. The T-joint 19 and the reducer 20 constitute an outlet-side joint for welding the other end of the outer tube 11 and the end of the fin tube 13 in a sealed state. The outer tube 11, the T-joints 16, 19, and the reducers 17, 20 are welded in a sealed state with a welding material 21 such as solder (see FIG. 1). The two materials may be joined together. In addition, T joint 16, 1
9 when welding aluminum fin tube 1 with low melting point
In order to make the 3 harder to melt, the fin tube 13 is welded while being cooled by a predetermined cooling means.

The inner tube 14 made of titanium and the copper reducers 17 and 20 constituting the inlet / outlet side joint are made of different materials, so that the joining property is poor.
Aluminum fin tube 1 with good weldability to 7, 20
3 and these members are welded to each other to indirectly join the inner tube 14 and the reducers 17 and 20, so that expensive titanium copper clad is not required as in the conventional means. Inner tube 14 and reducer 17 of different materials,
20 can be satisfactorily joined, and the cost of the heat exchanger 10 can be reduced. As shown in FIGS. 1 and 3, when the refrigerant flows from the inlet portion 15 into the refrigerant passage formed between the outer tube 11 of the manufactured heat exchanger 10 and each fin member 12, the cooling heat of the refrigerant is changed to the fin tube. 13 from the outer peripheral surface to the inner pipe 14,
The water is transmitted from the fin member 12 to the inner pipe 14 via the fin pipe 13, and then transmitted to the seawater flowing into the inner pipe 14 from the inlet 14 a. At this time, the fin tube 13 is made of aluminum having good heat conductivity, and
Since 4 is tightly fitted inside, the cooling heat of the refrigerant spreads almost uniformly throughout the fin tube 13 with little heat loss and is transmitted to the seawater in the inner tube 14. Therefore, good heat conductivity can be obtained, and seawater can be effectively cooled.

The present invention is not limited to this embodiment, and is included in the present invention even if there is a design change without departing from the gist. For example, in the embodiment, the fin member of the fin tube has a flat plate shape, but any other shape such as a corrugated plate can be used. In addition, in the embodiment, the entrance / exit-side joint is constituted by two members, a T joint and a reducer, respectively.
The present invention is not necessarily limited to this. For example, the T-joint and the reducer may be provided from a single member such as a joint, or may be provided from three or more members.

Furthermore, in the embodiment, copper is shown as a material of the entrance-side joint, but the material is not limited to this, and other materials such as aluminum having good weldability can be adopted. In the embodiment, titanium is shown as the material of the inner tube,
The present invention is not limited to this, and may be a titanium alloy. Further, the manufacturing method of the tube portion of the heat exchanger is not limited to the manufacturing method of the embodiment, for example, after inserting the inner tube into the fin tube, press-fitting the expanding member into the inner tube to insert the inner tube. After expanding the diameter, the fin tube and the inner tube are integrated, or after the fin tube and the inner tube are sequentially inserted into the outer tube, the expanding member is pressed into the inner tube to expand the fin tube and the inner tube at once. Accordingly, various methods such as providing a tube portion can be adopted.

[0013]

In the heat exchanger according to the first aspect of the present invention, when the inner pipe and the inlet / outlet side joint are joined in this manner, the heat exchanger can be welded or brazed to the inlet / outlet side joint because of the same material. By joining via a fin tube, the inner tube and the inlet / outlet side joint can be favorably joined without using expensive titanium copper clad unlike conventional means, and the cost of the heat exchanger can be reduced. Can also be planned. Further, the heat of the heat exchange medium flowing between the plurality of fin members and the outer tube reaches a heat transfer path from the inner peripheral surface of the fin tube to the inner tube, and reaches the inner tube from the fin member through the fin tube. The heat is transferred from the heat transfer path to the fluid flowing in the inner tube, but since the inner tube is tightly fitted inside the fin tube, the heat of the heat exchange medium spreads almost uniformly to the fin tube with little heat loss. It is transmitted to the fluid in the pipe. Therefore, good heat conductivity can be obtained, and effective heat exchange can be performed.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the heat exchanger at a position S1-S1 in FIG.

FIG. 3 is an overall plan view of the same.

FIG. 4 (a) is a perspective view of the inner tube and the fin tube after press-contact. (B) It is a perspective view after pressure contact of the fin tube in which the inner tube was internally fitted, and the outer tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Heat exchanger 11 Outer tube 12 Fin member 13 Fin tube 13a Cylindrical part 14 Inner pipe 14a Inlet part 14b Outlet part 15 Inlet part 16 T joint 17 Reducer 18 Outlet part 19 T joint 20 Reducer 21 Welding material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F28D 7/10 F28F 21/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal outer tube, a fin tube having both ends protruding from both ends of the outer tube, and a plurality of fin members provided radially outward in cross section in a protruding state; The fin tube is welded or brazed in a sealed state at both ends thereof, and furthermore, an inlet / outlet side joint provided with an inlet portion and an outlet portion of a heat exchange medium, respectively, and is fitted inside the fin tube in a tight contact state. An inner tube made of titanium or a titanium alloy provided with an inlet portion and an outlet portion of a fluid to be heat-exchanged at both ends, the outer tube, the fin tube,
And a material of the entrance-side joint is one of copper and aluminum, the same material.