JP3026515U - Heat exchanger - Google Patents

Abstract

(57) [PROBLEMS] To provide a heat exchanger that is easy to manufacture, inexpensive, and capable of improving thermal efficiency. SOLUTION: The inner tube 11 made of titanium having an inlet part and an outlet part, through which a fluid passes, and a material having good thermal conductivity and bonding property, and arranged closely to the outer side of the inner tube 11. The outer tube 12 and a fin tube 13 made of a material having good thermal conductivity and bonding properties, and a plurality of fin plates 15 whose tips are in contact with the outside of the outer tube 12 and which project radially inward in a cross section. And one end of each fin tube 13 is joined to each end of the fin tube 13 and the other end is joined to the protruding outer tube 12, and the connecting portions 16 to 1 are connected to the middle portion.
And joints 19, 20 with 8.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a heat exchanger in which a pressure loss of a fluid passing through the inside is small, a joint portion is easily connected, and the manufacturing cost is low.

[0002]

[Prior art]

 As a heat exchanger used for cooling seawater, the heat exchanger described in Japanese Utility Model Laid-Open No. 6-40666 is known, which has an inlet portion and an outlet portion, through which a fluid flows. An inner tube made of titanium, an outer tube made of a material made of copper or a copper alloy and closely arranged on the outer side of the inner tube, and an outer tube made of a material made of copper or a copper alloy on the outer side of the outer tube, and its tip A fin tube in which a large number of fin plates abutting against each other project radially inward, and one end of each fin tube is joined to each end of the fin tube and the other end is joined to the outer tube. A heat exchanger having a joint provided with a connection port is known.

[0003]

[Problems to be solved by the device]

 However, in the heat exchanger described in the above publication, titanium, which is the inner tube, is excellent in corrosion resistance and strength, but it is expensive as compared with other materials, and as a result, there is a problem that the price increases. . Further, titanium has good corrosion resistance, but its thermal conductivity is poor as compared with copper or copper alloy. Therefore, in the heat exchanger described in the above publication, since titanium is thick, there is a problem that thermal conductivity is deteriorated and thermal efficiency is reduced. 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 easy to manufacture, inexpensive, and capable of improving thermal efficiency.

[0004]

[Means for Solving the Problems]

The heat exchanger according to claim 1, which meets the above object, comprises an inner tube made of titanium having an inlet part and an outlet part, through which a fluid passes, and a material having good thermal conductivity and bonding property, An outer tube closely arranged on the outer side of the inner tube and a large number of fin plates whose tips contact the outer side of the outer tube in a radial cross section made of a material having good thermal conductivity and bonding properties. Made of a metal having good joining properties, and one end thereof is joined to each end of the fin pipe, the other end thereof is joined to the projecting outer pipe, and the middle portion is In a heat exchanger having a joint provided with a connecting portion, where the inner tube has a thickness of T ₁ and the outer tube has a thickness of T ₂ , these satisfy the following equation (1). There is. 0.05 ≦ T ₁ / (T ₁ + T ₂ ) ≦ 0.35 (1) The heat exchanger according to claim 2 is the heat exchanger according to claim 1, wherein the outer tube and the fins are the same. The pipe and the joint are made of copper or copper alloy, respectively, and the joint and the outer pipe and the fin pipe are connected by brazing. The heat exchanger according to claim 3 is the heat exchanger according to claim 1, wherein the outer pipe, the fin pipe, and the joint are made of copper or a copper alloy, and the joint, the outer pipe, and the fin. The connection with the pipe is made by welding. A heat exchanger according to a fourth aspect is the heat exchanger according to the first aspect, wherein the thickness T ₁ of the inner pipe is in the range of 0.2 to ₁ mm. Here, the thickness of the inner pipe being 0.2 mm or more means that it is difficult to manufacture a single inner pipe if the thickness of the inner pipe is less than 0.2 mm. It is necessary and there is no economic merit. The heat exchanger according to claim 5, which has an inlet part and an outlet part, is made of a titanium inner tube through which a fluid passes, and a material having a good thermal conductivity and a good joint property. A large number of fin plates, which are made of a material with good thermal conductivity and bonding properties, and whose tips are in contact with the outside of the outer tube, are made to project radially inward in cross section. In a heat exchanger having a fin tube, where the thickness of the inner tube is T ₁ and the thickness of the outer tube is T ₂ , these satisfy the formula (1). A heat exchanger according to a sixth aspect is the heat exchanger according to the fifth aspect, wherein the inner tube has a thickness T ₁ of 0.2 to ₁ mm. The heat exchanger according to claim 7 has an inner pipe made of titanium having an inlet part and an outlet part, through which a fluid passes, and a material having good thermal conductivity and bondability. An outer tube closely arranged on the outer side of the outer tube, an outer tube made of a material having good thermal conductivity and a good bonding property, and having a gap on the outer side of the outer tube, and a metal having a good bonding property. And a heat exchanger having one end joined to each end of the outer tube, the other end joined to the projecting outer tube, and a joint having a connection part in the middle part. However, when the thickness of the inner pipe is T ₁ and the thickness of the outer pipe is T ₂ , these satisfy the above equation (1). In the formula (1), T ₁ / (T ₁ + T ₂ ) is set to 0.05 or more because the thickness of the inner tube is small when T ₁ / (T ₁ + T ₂ ) is less than 0.05. The reason for this is that T ₁ / (T ₁ + T ₂ ) is set to 0.35 or less because T ₁ / (T ₁ + T ₂ ) exceeds 0.35. This is because if the thickness is too thick, the thermal conductivity when combined with the outer tube will deteriorate, and the efficiency of the heat exchanger will decrease.

[0005]

[Action]

In the heat exchanger according to the present invention, the inner tube through which the fluid passes is a titanium tube, so that it has good corrosion resistance as before. Since the outer pipe is placed in close contact with the outside of the inner pipe, the outer pipe reinforces the inner pipe, and the outer pipe mainly bears the pressure when a high-pressure fluid is flown into the inner pipe or the fin pipe. . Therefore, since the outer tube bears the internal pressure, the thickness of the inner tube made of expensive titanium can be reduced. Next, if the fin plate of the fin tube is directly contacted with the inner tube without providing the outer tube, it is necessary to increase the thickness of the inner tube due to strength problems. Since titanium, which has poor heat conductivity, is used for the above, there is a problem in that the heat exchange efficiency decreases. In the case of the heat exchanger according to the present invention, the inner tube made of titanium is made thin and the outer tube with good thermal conductivity maintains strength, and the relative thermal conductivity is relatively improved to improve the heat exchange efficiency. are doing. When joining joints attached to both sides of a fin tube, the joint itself is made of a material with good jointability (for example, copper, copper alloy, etc.), and one end is made of a material with good jointability. Since the fin tube is joined to the outer tube whose other end is made of a material with good jointability, it can be joined without using expensive titanium copper clad, etc., which has good jointability. Further, when the thickness of the inner pipe is T ₁ and the thickness of the outer pipe is T ₂ , these satisfy the formula (1), and thus the inner pipe made of titanium can be thin. As a result, it can be manufactured at a lower cost, and since the thickness of titanium, which has low thermal conductivity, is small, the thermal conductivity is improved and the thermal efficiency is improved. And, in particular, when the fin tube and the joint are made of copper or copper alloy as described above, the outer tube is easily available and has good bonding property and thermal conductivity. Further, since they can be joined by brazing or welding, there is an advantage that they have good sealing property and workability.

[0006]

[Effect of device]

 In the heat exchanger according to the present invention, the expensive titanium copper clad is not used for the joint part, and the outer part of the inner tube is reinforced by the outer tube with good thermal conductivity, so the heat efficiency is improved. Besides, it can be manufactured at low cost. Since the inner tube made of titanium is made thin as shown in the above formula (1), the overall thermal conductivity is improved, the heat exchanger becomes efficient, and the expensive titanium is used. The heat exchanger can be manufactured at low cost because the amount of material used is reduced.

[0007]

[Embodiment of device]

 Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is an enlarged sectional view of a joint portion of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 4 and 5 are sectional views of a heat exchanger according to another embodiment of the present invention.

As shown in FIGS. 1 to 3, a heat exchanger 10 according to an embodiment of the present invention is arranged in close contact with an inner pipe 11 made of titanium and the outer side of the inner pipe 11. It has an outer pipe 12, a fin pipe 13 arranged on the outer periphery of the outer pipe 12, and joints 14 arranged on both sides of the fin pipe 13. These will be described in detail below.

The inner pipe 11 is a well-known titanium pipe, but is thinner than a conventional titanium pipe having the same pressure specifications. An outer pipe 12 made of copper or a copper alloy is arranged on the outer side of the outer pipe 12 in close contact with each other, and the inner pipe 11 and the outer pipe 12 bear the internal and external loads. Here, the thickness (wall thickness) of the inner pipe 11 is T ₁ , The thickness (wall thickness) of the outer tube 12 is T₂In such a case, the thicknesses of the inner pipe 11 and the outer pipe 12 are determined within the range where they satisfy the above expression (1). The outer tube 12 is subjected to a drawing process so as to be in close contact with the inner tube 11.

The fin tube 13 is made of copper or a copper alloy, and is internally provided with a large number of fin plates 15 (in this example, 12 sheets) as shown in FIG. Close to twelve. The fin tube 13 is also drawn so that the fin plate 15 is pressed against the outer circumference of the outer tube 12.

The joint 14 is made of copper or a copper alloy, and as shown in FIG. 1, one of the T-shaped joint member 19 and the T-shaped joint member 19 in which the connecting portions 16 to 18 are formed in three directions. It is composed of a different-diameter joint member 20 joined to the straight-side connecting portion 18. The connecting portion 16 of the T-shaped joint member 19 is brazed to the fin tube 13, and the connecting portion 18 of the T-shaped joint member 19 is brazed to the large diameter portion 21 of the different diameter joint member 20. Further, the small-diameter portion 22 of the different-diameter joint member 20 is brazed to the outer pipe 12 protruding further outward from the end of the fin portion 13.

On the other hand, a joint such as a flange or a socket (not shown) is welded or brazed to the connecting portion 17 of the T-shaped joint member 19, and the inside of the fin pipe 13 is surrounded by the outer pipe 12 through this portion. The refrigerant can be supplied to. Further, a joint such as a flange or a socket (not shown) is welded to the inner pipe 11 so that the liquid to be cooled passes through.

In the above-described embodiment, copper or copper alloy is used as an example of a material having good heat conduction and bondability for the outer tube 12, the fin tube 13, and the joint 14, but, for example, aluminum or the like is also used. can do. Further, as the joint 14, the T-shaped joint member 19 and the different-diameter joint member 20 are used in combination, but it is also possible to use a T-shaped joint member having a different diameter integrated with these.

Next, the heat exchanger according to the present invention will be described in more detail based on specific dimensions. Table 1 shows that in the heat exchanger used for each pressure resistance (external pressure), the inner tube 11 is completely adhered to the outer tube 12, and the film heat transfer coefficient of the inner and outer surfaces is 5000 (kcal / m ² h ° C). And 6000 (kcal / m ² h ° C) and the temperature difference between the inner and outer surfaces was 10 ° C, the heat exchange amount per 1 m of heat transfer tube (kcal / h) was compared for each outer diameter. Shown with an example. The outer tube 12 (made of copper) had a thermal conductivity of 320 (kcal / mh ° C), and the inner tube 11 (made of titanium) had a thermal conductivity of 15 (kcal / mh ° C). In Table 1, Cu / Ti is copper for the outer tube and titanium for the inner tube, and the number in parentheses (for example, 5.2%) indicates the ratio of T ₁ / (T ₁ + T ₂ ).

[0015]

[Table 1]

Further, Tables 2 and 3 show the thickness of the copper / titanium (Cu / Ti) double pipe shown in Table 1 for each pressure resistance (external pressure), and Table 4 shows the thickness of the double pipe. Shows the thickness of single tubes of copper and titanium.

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

[Table 4]

As is clear from the above Tables 1 to 4, the use of thin titanium for the inner tube 11 makes it cheaper than the case of using all titanium. Therefore, it is more preferable to make the thickness of titanium as thin as possible and further to make the thickness of the inner tube 0.2 mm or more from the viewpoint of manufacturing problems.

FIG. 4 shows a cross section of a heat exchanger 25 according to another embodiment of the present invention. The same components as those of the heat exchanger according to the above embodiment are designated by the same reference numerals. The detailed description is omitted. As shown in FIG. 4, a heat exchanger 25 according to another embodiment of the present invention includes an outer tube 26 having no fins inside instead of the fin tubes 13 of the heat exchanger 10 according to the above embodiment. Is used. The outer tube 26 is made of copper or a copper alloy and is arranged with a certain gap. The joint 14 described above is provided on both sides of the joint 14. The thicknesses of the inner pipe 11 and the outer pipe 12 are the same as those in the above embodiment. When this heat exchanger 25 is used, a refrigerant or a heat medium is passed between the outer tube 12 and the outer tube 26 so that a liquid or a gas to be heat-exchanged flows in the inner tube 11. used.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an overall side view of a heat exchanger.

FIG. 4 is a partial cross-sectional view of a heat exchanger according to another embodiment of the present invention.

[Explanation of symbols]

10 heat exchanger 11 inner pipe 12 outer pipe 13 fin pipe 14 joint 15 fin plate 16 connection portion 17 connection portion 18 connection portion 19 T-shaped joint member 20 different diameter joint member 21 large diameter portion 22 small diameter portion 25 heat exchanger 26 outside Tube

Claims (7)

[Scope of utility model registration request] 1. An inner pipe made of titanium having an inlet part and an outlet part, through which a fluid passes, and a material having good thermal conductivity and bonding property, and arranged closely to the outside of the inner pipe. And a fin tube made of a material having a good thermal conductivity and a good joint property, and a plurality of fin plates whose tips are in contact with the outside of the outer tube and which are radially inwardly projected in a cross-section. Made of a metal having good properties, one end of which is joined to each end of the fin pipe, the other end of which is joined to the projecting outer pipe, and which has a joint with a connecting portion in the middle part A heat exchanger, characterized in that, when the thickness of the inner tube is T ₁ and the thickness of the outer tube is T ₂ , they satisfy the following formula. 0.05 ≦ T ₁ / (T ₁ + T ₂ ) ≦ 0.35 2. The outer pipe, the fin pipe, and the joint are each made of copper or a copper alloy, and the joint and the outer pipe and the fin pipe are connected by brazing. Heat exchanger. 3. The heat exchange according to claim 1, wherein the outer pipe, the fin pipe, and the joint are made of copper or a copper alloy, and the joint and the outer pipe and the fin pipe are connected by welding. vessel. 4. The thickness T _{1 of the} inner tube is 0.2 to ₁ mm.
The heat exchanger according to claim 1, which is in the range of. 5. An inner pipe made of titanium having an inlet part and an outlet part, through which a fluid passes, and a material having good thermal conductivity and bonding property, and arranged in close contact with the outer side of the inner pipe. Outer tube and a fin tube made of a material having good thermal conductivity and bonding property and having a large number of fin plates whose tips contact the outside of the outer tube and which project radially inward in a cross section. A heat exchanger, characterized in that, when the thickness of the inner pipe is T ₁ and the thickness of the outer pipe is T ₂ , these satisfy the following equations. 0.05 ≦ T ₁ / (T ₁ + T ₂ ) ≦ 0.35 6. The thickness T _{1 of the} inner tube is 0.2 to ₁ mm
The heat exchanger according to claim 5, which is in the range of. 7. An inner pipe made of titanium having an inlet part and an outlet part, through which a fluid passes, and a material having good thermal conductivity and bonding property, and arranged in close contact with the outer side of the inner pipe. The outer tube, which is made of a material having good thermal conductivity and bonding properties, and is arranged outside the outer tube with a gap, and the outer tube, which is made of metal having good bonding properties. A heat exchanger having one end joined to each end of the pipe, the other end joined to the projecting outer pipe, and a joint having a connecting part in the middle, A heat exchanger characterized by satisfying the following equations, where T ₁ is the thickness and T ₂ is the thickness of the outer tube. 0.05 ≦ T ₁ / (T ₁ + T ₂ ) ≦ 0.35