JPH0640667U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a heat exchanger that is inexpensive and has good heat conductivity. A metal outer tube (11) and a fin tube (1) provided with both end portions projecting from both ends of the outer tube (11) and having a large number of fin members (12) projecting outward in a radial cross section.
3, the outer pipe 11 and the fin pipe 13, both ends of which can be welded or brazed in a sealed state, and an inlet / outlet side joint 16 provided with an inlet portion 15 and an outlet portion 18 for the heat exchange medium, 17, 19 and 20 and an inner tube 14 made of titanium or titanium alloy, which is fitted in the fin tube 13 in a close contact state and is provided at both ends with an inlet portion 14a and an outlet portion 14b for heat exchange fluid. Prepared

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger, and more particularly, to a heat exchanger that is inexpensive and has good heat conductivity.

[0002]

[Prior art]

 Conventionally, as a double tube for a heat exchanger, for example, one described in the double tube end structure of Japanese Utility Model Laid-Open No. 64-22172 is known. In this heat exchanger, an inner tube made of titanium or a titanium alloy is inserted into a copper fin tube in which a number of fin members are provided in a state of projecting inward in a radial cross section. Is sealed and welded in a bag shape by a copper inlet-side joint having a heat exchange medium inlet and a copper outlet-side joint having a heat exchange medium outlet. By the way, the fin pipe and the inlet / outlet joint are both made of copper, so the weldability is good, but the inner pipe and inlet / outlet joint are made of different materials such as copper and titanium, so the weldability is poor. Therefore, the inner pipe and the joint on the inlet / outlet side are welded in the middle with a titanium copper clad. The titanium-copper clad is expensive because it is manufactured by a special manufacturing method.

[0003]

[Problems to be solved by the device]

 However, in the past, since the expensive titanium-copper clad was used for joining the inner pipe and the inlet / outlet side joint in this way, the use of this titanium-copper clad increased the price of the heat exchanger. The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat exchanger that is inexpensive and has good heat transfer properties.

[0004]

[Means for Solving the Problems]

 A heat exchanger according to claim 1, which is in accordance with the above object, in which a metal outer tube and both end portions of the outer tube project from both ends of the outer tube, and a plurality of fin members radially outwardly project in a cross section. The provided fin pipe and the inlet / outlet side joint in which both ends of the outer pipe and the fin pipe can be welded or brazed in a hermetically sealed state and the heat exchange medium inlet and outlet are respectively provided And an inner pipe made of titanium or titanium alloy, which is fitted in the fin pipe in a close contact state and has an inlet and an outlet for a fluid for heat exchange at both ends.

[0005]

[Action]

 In the heat exchanger according to claim 1, in joining the inner pipe and the inlet / outlet side joint, the outer pipe is fitted to the inner pipe and further joined to the inlet / outlet side joint via a fin pipe that can be welded or brazed. As a result, the inner pipe and the inlet / outlet side joint can be welded well without using an expensive titanium-copper clad as in the conventional means, and the cost of the heat exchanger can be reduced. The heat of the heat exchange medium flowing between the multiple fin members and the outer pipe reaches the inner pipe through the heat transfer path from the inner peripheral surface of the fin pipe to the inner pipe or through the fin member through the fin pipe. The heat is transferred from the heat transfer path to the fluid flowing in the inner tube, but since the inner tube is fitted in the fin tube in a close contact state, the heat of the heat exchange medium spreads evenly over 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]

【Example】

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is an enlarged cross-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 S1-S1 position in FIG. 1, and FIG. Fig. 4 (a) is a perspective view of the inner pipe and the fin pipe after press contact, and Fig. 4 (b) is a perspective view of the fin pipe in which the inner pipe is fitted and the outer pipe after press contact.

As shown in FIG. 3, a heat exchanger 10 according to an embodiment of the present invention is a long tube body curved in an elongated hole shape in plan view. As shown in FIGS. 1 and 2, the heat exchanger 10 has an outer pipe 11 made of copper, and a large number of flat plate-shaped fin members 12 project outward in a radial cross section in the outer pipe 11. The fin tube 13 made of aluminum and relatively thin, which is integrally molded with, is fitted inside. Both ends of the fin tube 13 protrude from both ends of the outer tube 11 as a cylindrical portion 13a in which the fin member 12 is cut out, and the outer tube 11 is slightly longer than the fin member 12 and both ends thereof are fin members. 12 project from both ends in the length direction. In this way, the outer pipe 11 is made slightly longer than the fin member 12 because the aluminum fin member 12 having a low melting point is used when welding both ends of the outer pipe 11 and T joints 16 and 19 described later. This is to prevent it from being melted and deformed by heat during welding. 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 serve as an inlet for seawater as an example of a fluid for heat exchange. It is a portion 14a and an outlet portion 14b (see FIG. 3).

Next, referring to FIG. 4, 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. As shown in FIG. The inner pipe 14 having a diameter slightly smaller than that of the fin pipe 13 is inserted into the fin pipe 13, and the fin pipe 13 is pressed from the outside by a die (not shown) to reduce the diameter, thereby integrating the fin pipe 13 and the inner pipe 14. Next, as shown in FIG. 4B, the fin tube 13 integrated with the inner tube 14 is inserted into the outer tube 11 having an inner diameter slightly larger than the diameter of the circle connecting the tips of the fin members 12. Similarly, the outer pipe 11 is pressed from the outside by a die (not shown) to reduce the diameter, and the inner pipe surface of the outer pipe 11 is pressed against the tip of the fin member 12 so that the two pipes 11 and 13 are integrated and heat-treated. The tube portion of the exchanger 10 is manufactured.

Referring back to FIGS. 1 and 3, one end of a copper T-joint 16 is provided with an inlet portion 15 for a refrigerant such as fluorocarbon, which is an example of a heat exchange medium, at the end portion of the outer tube 11 on one side. The T-joint 16 and one cylindrical portion 13a of the fin tube 13 exposed to the outside are connected by a reducer 17 made of copper. The T-joint 16 and the reducer 17 constitute an inlet-side joint that welds the end of the outer pipe 11 on one side and the end of the fin pipe 13 in a sealed state. One end of a copper T-joint 19 having a refrigerant outlet portion 18 protruding upward is externally fitted to the end portion of the outer pipe 11 on the other side. The one cylindrical portion 13a is connected by a reducer 20 made of copper. These T-joint 19 and reducer 20 constitute an outlet-side joint that welds the end portion of the outer pipe 11 on the other side and the end portion of the fin pipe 13 in a sealed state. The joints of the outer pipe 11, the T joints 16, 19 and the reducers 17, 20 are welded in a sealed state by a welding material 21 such as solder (see FIG. 1). Both materials may be joined by attachment. Further, when the T-joints 17 and 20 are welded, the fin tube 13 made of aluminum having a low melting point is more difficult to melt, so that the fin tube 13 is welded while being cooled by a predetermined cooling means.

Since the inner pipe 14 made of titanium and the reducers 17, 20 made of copper constituting the inlet / outlet side joint are different materials, the joining property is poor, but the inner pipe 14 is thus weldable with the reducers 17, 20. Since the fin tube 13 made of good aluminum is externally fitted and these members are welded to indirectly join the inner tube 14 and the reducers 17 and 20, the expensive titanium as in the conventional means is used. Even if the copper clad is not used, the inner tube 14 made of different materials and the reducers 17, 20 can be joined well, 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 pipe 11 and each fin member 12 of the manufactured heat exchanger 10, the cooling heat of the refrigerant is reduced. It is transmitted from the outer peripheral surface of the inner pipe 13 to the inner pipe 14, or from the fin member 12 to the inner pipe 14 via the fin pipe 13 and then to the seawater flowing into the inner pipe 14 from the inlet portion 14a. . At this time, since the fin tubes 13 are made of aluminum having good heat conductivity and the inner tubes 14 are fitted in the fin tubes 13 in a close contact state, the cooling heat of the refrigerant is small in heat loss and the fin tubes 13 as a whole. Spreads almost uniformly over the water and is transmitted to the seawater in the inner pipe 14. Therefore, good heat conductivity can be obtained, and the seawater can be effectively cooled.

The present invention is not limited to this embodiment, and the present invention is included even if there is a design change within the scope not departing from the gist. For example, in the embodiment, the fin member of the fin tube has a flat plate shape, but may have any other shape such as a corrugated plate shape. Further, in the embodiment, the inlet / outlet side joint is composed of two members, that is, the T joint and the reducer, but the present invention is not necessarily limited to this. For example, a single joint such as a T joint and a reducer may be combined. It may be provided from a member or from three or more members.

Further, in the embodiment, copper is shown as the material of the inlet / outlet side joint, but the material is not limited to this, and other good materials such as aluminum or an alloy of copper and aluminum can be used. . Further, in the embodiment, titanium is shown as the material of the inner tube, but the material is not limited to this and may be a titanium alloy. Further, the manufacturing method of the tubular body portion of the heat exchanger is not limited to the manufacturing method of the embodiment, and for example, after inserting the inner pipe into the fin pipe, the inner diameter pipe is pressed into the inner pipe to insert the inner pipe. The fin tube and the inner tube are integrated by expanding the diameter, or after inserting the fin tube and the inner tube into the outer tube in order, press the expansion member into the inner tube to expand the fin tube and the inner tube at once. Therefore, various methods such as providing a tube portion can be adopted. Further, in the embodiment, the outer pipe is made slightly longer than the fin pipe, but the present invention is not limited to this. For example, the outer pipe and the fin pipe may have substantially the same length. However, in this case, unless the melting point of the material of the outer tube is higher than or substantially equal to that of the material of the outer tube, the fin tube may melt during welding of the outer tube and the inlet / outlet side joint.

[0013]

[Effect of device]

 In the heat exchanger according to the first aspect of the present invention, in joining the inner pipe and the inlet / outlet side joint in this manner, the heat exchanger is fitted onto the inner pipe, and the inlet / outlet side joint is welded or brazable via a fin tube. By joining the inner pipe and the inlet / outlet side joint well without using an expensive titanium-copper clad unlike the conventional means, the cost of the heat exchanger can be reduced. The heat of the heat exchange medium flowing between the multiple fin members and the outer pipe reaches the inner pipe through the heat transfer path from the inner peripheral surface of the fin pipe to the inner pipe or through the fin member through the fin pipe. The heat is transferred from the heat transfer path to the fluid flowing in the inner tube, but since the inner tube is fitted in the fin tube in a close contact state, the heat of the heat exchange medium spreads evenly over 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 drawings]

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

FIG. 2 is an enlarged sectional view of the heat exchanger at S1-S1 position 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 pressure welding. (B) It is a perspective view after the pressure contact of the fin pipe in which the inner pipe was fitted and the outer pipe.

[Explanation of symbols]

 10 heat exchanger 11 outer pipe 12 fin member 13 fin pipe 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

Claims (1)

[Scope of utility model registration request] 1. An outer pipe made of metal, a fin pipe having both end portions projecting from both ends of the outer pipe, and a plurality of fin members provided radially outward in a projecting state, and the outer pipe. And, both ends of the fin tube can be welded or brazed in a sealed state, and the inlet and outlet side joints provided with the inlet and outlet of the heat exchange medium are fitted in the fin tube in a close contact state. A heat exchanger comprising: an inner tube made of titanium or a titanium alloy, the inner tube being provided with an inlet and an outlet for a fluid to be heat-exchanged at both ends.