JPH0640666U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a heat exchanger that is inexpensive and has good heat conductivity. A fin tube 12 is provided with a large number of fin members 11 protruding inward in a radial cross-section, and both ends thereof are projected from both ends of the fin tube 12 and are pressed against the tips of the fin members 11. The intermediate pipe 13 fitted in the fin pipe 12 in this state, the both ends of the fin pipe 12 and the end of the intermediate pipe 13 can be joined by welding or brazing, and the heat exchange medium inlet 15 and Inlet / outlet joints 16, 17, 19, 20 each provided with an outlet portion 18,
The inner pipe 14 is fitted in the intermediate pipe 13 in a close contact state, and the inner pipe 14 made of titanium or titanium alloy is provided with an inlet portion 14a and an outlet portion 14b for heat exchange at both ends.

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 of 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 large number of fin members are provided so as to project inward in a radial cross section, and both end portions of the fin tube and the inner tube are inserted. 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, although the fin pipe and inlet / outlet joint are both made of copper, 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]

 The heat exchanger according to claim 1, which is in accordance with the above object, has a fin tube provided with a large number of fin members protruding inward in a radial cross section, and both ends thereof protruding from both ends of the fin tube. An intermediate pipe that is fitted into the fin pipe in a pressure contact state with the tips of the fin members, and both ends of the fin pipe and the ends of the intermediate pipe can be joined together by welding or brazing. Part and outlet part, and a titanium or titanium alloy inner part that is fitted in the intermediate pipe in close contact with each other and has an inlet part and an outlet part for the fluid to be heat-exchanged at both ends. It has a structure with a pipe.

[0005]

[Action]

 In the heat exchanger according to claim 1, when the inner pipe and the inlet / outlet side joint are joined, the inlet / outlet side joint is joined via an intermediate pipe that can be joined by welding or brazing, so that the conventional means is realized. Even without using expensive titanium-copper clad, the inner tube and the inlet / outlet side joint can be joined well, and the cost of the heat exchanger can be reduced. Further, the heat of the heat exchange medium flowing between the multiple fin members and the inner pipe reaches the inner pipe through the heat transfer path from the outer peripheral surface of the intermediate pipe to the inner pipe, or from the fin member through the intermediate pipe to the inner pipe. The heat is transferred from the heat transfer passage to the fluid flowing in the inner pipe, but the tip of the fin member is pressed against the outer peripheral surface of the intermediate pipe, and the intermediate pipe is externally fitted in close contact with the inner pipe. The heat of the heat exchange medium thus transferred has little heat loss and spreads almost uniformly over the entire intermediate pipe, and is transferred to the fluid in the inner 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 intermediate pipe after pressure welding, and Fig. 4 (b) is a perspective view of the inner pipe to which the intermediate pipe is externally fitted and the fin pipe after pressure welding.

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 a copper fin tube 12 integrally formed with a large number of flat plate-like fin members 11 in a protruding state inward in a radial cross section. A thin, copper-made intermediate tube 13 is fitted in the tube 12, and a titanium-made inner tube 14 is fitted in the intermediate tube 13. The intermediate pipe 13 and the inner pipe 14 have the same length, and both ends of the inner pipe 14 expose the intermediate pipe 13 and project from both ends of the fin pipe 12. Further, the openings at both ends of the inner pipe 14 serve as an inlet portion 14a and an outlet portion 14b of seawater as an example of a fluid for heat exchange (see FIG. 3).

Next, referring to FIG. 4, a method of manufacturing the tubular body portion of the heat exchanger 10 including the fin tube 12, the intermediate tube 13, and the inner tube 14 will be described. First, as shown in FIG. Into the intermediate pipe 13, an inner pipe 14 having a diameter slightly smaller than that of the intermediate pipe 13 is inserted, and the intermediate pipe 13 is pressed from the outside by a die 1 (not shown) to reduce the inner diameter of the intermediate pipe 13. Closely attach to 14 and integrate both tubes. Next, as shown in FIG. 4 (b), the inner tube 14 with the intermediate tube 13 fitted therein is inserted into the fin tube 12 having an inner diameter slightly larger than that of the intermediate tube 13, and the fin is also applied to a fin not shown in the drawing. The tube 12 of the heat exchanger 10 is integrated by integrating the fin tube 12 and the intermediate tube 13 with the tip of the fin member 11 pressed against the outer peripheral surface of the intermediate tube 13 by pressurizing the tube 12 from the outside to reduce the diameter. The body is manufactured.

Returning 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 CFC gas, which is an example of a heat exchange medium, at the end portion of the fin tube 12 on one side. The portion is externally fitted, and the T-joint 16 and one end of the intermediate pipe 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 capable of joining the end portion of the fin pipe 12 and the end portion of the intermediate pipe 13 on one side by welding or brazing. 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 fin tube 12 on the other side, and the T-joint 19 and one end portion of the intermediate pipe 13 exposed to the outside. And are connected by a reducer 20 made of copper. These T-joint 19 and reducer 20 constitute an outlet-side joint capable of joining the end of the fin tube 12 on the other side and the end of the intermediate tube 13 by welding or brazing. The joints of the fin tube 12, the T joints 16 and 19, and the reducers 17 and 20 are liquid-tightly sealed and welded by a welding material 21 such as solder (see FIG. 1). Instead of this welding, brazing may be used for joining.

The inner pipe 14 made of titanium and the reducers 17, 20 made of copper constituting the inlet / outlet side joint are different materials, so the joining property is poor, but in this way, the inner pipe 14 is made of the same material as the reducers 17, 20. Since the intermediate tube 13 made of copper, which is the one described above, is externally fitted to join both members, the welding material 21 fits well to the welded portion and is solid without using expensive titanium copper clad unlike the conventional means. Fix both members to. As a result, good bondability can be obtained, and the cost of the heat exchanger 10 can be reduced. As shown in FIGS. 1 to 3, when the refrigerant is made to flow from the inlet portion 15 to the refrigerant passage formed between each fin member 11 and the inner pipe 14 of the heat exchanger 10 thus manufactured, the cooling heat of the refrigerant is It is transmitted from the outer peripheral surface of the intermediate pipe 13 to the inner pipe 14, or from the fin member 11 to the inner pipe 14 through the intermediate pipe 13 and then to the seawater flowing into the inner pipe 14 from the inlet portion 14a. At this time, the intermediate pipe 13 is made of copper having a good heat transfer property, only the tip of the fin member 11 is pressed against the outer peripheral surface of the intermediate pipe 13, and the intermediate pipe 13 is externally fitted onto the inner pipe 14 in a close contact state. Therefore, the cooling heat of the refrigerant transferred from the fin tube 12 side has little heat loss and spreads almost uniformly over the entire intermediate tube 13, and is transferred to the seawater in the inner tube 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, an outer tube made of any material may be fitted onto the fin tube.

Furthermore, in the embodiment, copper is shown as a material for the fin pipe including the fin member, the intermediate pipe, and the inlet / outlet side joint, but the present invention is not limited to this, and other aluminum or an alloy of copper and aluminum can be used. Any metal such as 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 intermediate pipe, the inner pipe is inserted by press-fitting the expanding member into the inner pipe. By expanding the diameter of the intermediate pipe and the inner pipe, or inserting the intermediate pipe and the inner pipe into the fin pipe, and then press-fitting a diameter expansion member into the inner pipe to expand the diameter of the intermediate pipe and the inner pipe at once. Depending on the method, various methods such as providing a tubular part can be considered. Furthermore, in the embodiment, the length of the intermediate pipe is the same as that of the inner pipe, but without being limited to this, at least the tips of the fin tubes project from both ends, and the protruding tips are at the inlet and outlet side joints. It suffices to have a length that reaches the connection position with.

[0013]

[Effect of device]

 In the heat exchanger according to claim 1, in joining the inner pipe and the inlet / outlet side joint in this manner, the heat exchanger according to the first aspect is joined to the inlet / outlet side joint through an intermediate pipe that can be joined by welding or brazing. However, the inner pipe and the inlet / outlet side joint can be satisfactorily joined without using an expensive titanium-copper clad unlike 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 inner pipe is transferred from the outer peripheral surface of the intermediate pipe to the inner pipe, or from the heat transfer path from the fin member to the inner pipe through the intermediate pipe. Transmitted to the fluid flowing in the inner pipe, but the tip of the fin member was pressed against the outer peripheral surface of the intermediate pipe, and the intermediate pipe was externally fitted in close contact with the inner pipe, so it was transmitted from the fin pipe side. The heat of the heat exchange medium has little heat loss and spreads almost uniformly over the entire intermediate pipe, and is transferred to the fluid in the inner 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 pipe and the intermediate pipe after pressure contact. (B) It is a perspective view after press-contacting the inner tube and the fin tube on which the intermediate tube is fitted.

[Explanation of symbols]

 10 heat exchanger 11 fin member 12 fin tube 13 intermediate tube 14 inner tube 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. A fin tube provided with a large number of fin members protruding inward in a radial cross-section, and both ends thereof protruding from both ends of the fin tube, and in a state of being pressed against the tips of the fin members. An intermediate pipe to be fitted in the fin pipe, both ends of the fin pipe, and ends of the intermediate pipe can be joined by welding or brazing, and an inlet portion and an outlet portion of the heat exchange medium are provided respectively. An inlet / outlet joint, and an inner pipe made of titanium or a titanium alloy, which is fitted in the intermediate pipe in a close contact state and has an inlet and an outlet for a fluid to be heat-exchanged at both ends. Heat exchanger.