JPH06304247A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the priming quantity and improve the heat exchange performance. CONSTITUTION:A heat exchanger 1A is equipped with a housing 2 having a blood inflow part 61, a blood effluence port 62, a heat exchange liquid inflow port 63, and a heat exchange liquid effluence port 66, and the inside of the housing 2 is partitioned into five spaces by partitioning walls 71-74. Further, inside the housing 2, a plurality of heat transfer pipes 8 are arranged parallel. Each heat transfer pipe 8 has a double pipe structure consisting of the outer and inner pipes 81 and 82, and both the edges of the outer pipe 81 are embedded and fixed on the partitioning walls 72 and 73, and both the edges of the inner pipe 82 are embedded and fixed on the partitioning walls 81 and 84. Blood flows in the first flow passage 92 between the outer and inner pipes 81 and 82, while the heat exchange liquid flows in the second flow passage 102 inside the inner pipe 82, and then flows in the third flow passage 105 outside the outer pipe 81, through circulation, and heat exchange is performed between these elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat between a first fluid and a second fluid, and more particularly to a heat exchanger for cooling or heating body fluids such as blood and plasma. .

[0002]

2. Description of the Related Art For example, an extracorporeal circulation circuit for extracorporeal circulation of blood during cardiac surgery has an artificial lung (gas exchanger) for oxygenating and decarbonating blood and a temperature of blood. A heat exchanger for adjusting the temperature is installed. After cooling or heating the blood introduced to the outside of the body by the heat exchanger, oxygenation and decarbonation are performed.

As a conventional heat exchanger installed in the blood extracorporeal circulation circuit, a heat exchanger having a plurality of metal heat transfer tubes (single tubes) arranged in parallel in a housing is known. Blood is flown outside the heat pipe and cooling water or warm water is flown inside to heat or heat the blood (Japanese Patent Laid-Open No. 64-76870, etc.). Further, in a heat exchanger having a similar structure, there is a heat exchanger that cools or heats blood by flowing blood inside each heat transfer tube and cooling water or hot water outside.

By the way, in such a heat exchanger, firstly, it is required that the heat exchange rate (heat exchange capacity) is high, and secondly that the priming amount of blood is smaller.

Of these, the heat exchange rate depends on the effective surface area of the heat transfer tube when the heat conductivity of the heat transfer tube material is constant,
The larger the effective surface area, the higher the heat exchange rate. However, in a conventional heat transfer tube having a single tube structure, if the design is made so as to increase the effective surface area, the priming amount will increase accordingly, and thus the above-described two performances cannot be compatible.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchanger capable of reducing the amount of priming and improving the heat exchange rate.

[0007]

Such an object is achieved by the present invention (1) described below. Also, the following (2)-
It is preferably (5).

(1) A housing, a first fluid inlet, a first fluid outlet, and a second fluid inlet,
It has an outlet for a second fluid and a plurality of heat transfer tubes installed in the housing, and performs heat exchange between the first fluid and the second fluid via the heat transfer tubes. In the heat exchanger, each of the heat transfer tubes has a double tube structure including an outer tube and an inner tube, and the first fluid is provided in a first flow path formed between the inner tube and the outer tube. And a second flow passage formed inside the inner pipe and a third flow passage formed outside the outer pipe, respectively. .

(2) The heat exchanger according to (1), wherein the second flow path and the third flow path communicate with each other through a fourth flow path.

(3) The heat exchanger according to (2), wherein the fourth flow path is formed in the housing.

(4) The heat exchanger according to (1), wherein the second fluid is supplied to the second flow path and the third flow path from independent systems.

(5) The heat exchanger according to any one of (1) to (4), wherein the first fluid is blood or plasma.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The heat exchanger of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is a vertical cross-sectional view showing a structural example when the heat exchanger of the present invention is applied to a heat exchanger installed in an extracorporeal blood circulation circuit. As shown in the figure, the heat exchanger 1A
Has a housing 2 including a tubular body 3 and cover members 4 and 5 liquid-tightly joined to both ends of the tubular body 3, respectively.

The side surface of the cylindrical main body 3 which is a main constituent member of the housing 2 is provided on the upper side and the lower side in FIG. 1, respectively.
An inflow port 61 and an outflow port 62 for blood, which is the first fluid, are formed to project.

Further, a liquid for heat exchange (hereinafter referred to as "heat exchange liquid"), which is a second fluid, is provided on each of the central portion of the cover member 4 and the side surface of the cylindrical main body 3 on the lower side in FIG. The inflow port 63 and the outflow port 66 are formed to project.

In the housing 2, four partition walls 71, 72, 73 and 74 are formed which partition the tubular body 3 along its axial direction (vertical direction in FIG. 1).

A blood inflow space 91 is provided between the partition walls 71 and 72.
And a blood outflow space 93 is formed between the partition walls 73 and 74.
Are formed. The inflow port 61 and the outflow port 62
Are blood inflow space 91 and blood outflow space 9 respectively.
It communicates with 3.

A heat exchange liquid inflow space 101 is formed between the partition wall 74 and the cover member 4, and a heat exchange liquid outflow space 103 is formed between the partition wall 71 and the cover member 5. . The inflow port 63 and the outflow port 66 communicate with the heat exchange liquid inflow space 101 and a third flow path 105 described later, respectively.

Further, in the housing 2, a plurality of heat transfer tubes 8 for exchanging heat between the first fluid and the second fluid.
Are arranged substantially parallel to each other along the axial direction of the cylindrical main body 3. Each of these heat transfer tubes 8 includes an outer tube 81 and an inner tube 82.
It has a double tube structure. Both ends of the outer tube 81 are
The inner pipe 82 is embedded and fixed in the partition walls 72 and 73, respectively, and both ends of the inner pipe 82 are projected and extended from both ends of the outer pipe 81, respectively, and embedded and fixed in the partition walls 71 and 74.

A first flow passage 92 through which blood flows is formed between the outer pipe 82 and the inner pipe 82, and a second flow passage 102 through which a heat exchange liquid flows is formed inside the inner pipe 82. . A third flow path 105 through which the heat exchange liquid flows is formed outside the outer tube 81 in the space between the partition walls 72 and 73. Further, the heat exchange liquid outflow space 103 and the third flow passage 105 are communicated with each other via a fourth flow passage 104 formed along the inner surface of the outer peripheral wall of the cylindrical main body 3.

The partition walls 71 to 74 are made of polyurethane, for example.
It is formed by injecting and curing a polymer potting material such as silicone or epoxy, the partition wall 71 liquid-tightly shields the blood inflow space 91 and the heat exchange liquid outflow space 103, and the partition wall 72 is Blood inflow space 91 and third flow path 1
05 is liquid-tightly shielded, the partition wall 73 is liquid-tightly shielded between the third flow path 105 and the blood outflow space 93, and the partition wall 74 is a liquidtight space between the blood outflow space 93 and the heat exchange liquid inflow space 101. Shield tightly.

The outer tube 81 and the inner tube 8 which constitute the heat transfer tube 8.
2 is preferably one having excellent thermal conductivity, such as stainless steel, aluminum, copper or a copper-based alloy,
A metal tube made of titanium or the like can be used. The constituent materials of the outer pipe 81 and the inner pipe 82 may be the same or different.

FIG. 4 is an enlarged cross-sectional view of the heat transfer tube 8.
In the heat exchanger 1A shown in FIG. 1, the outer tube 81 and the inner tube 82 shown in FIG. 4 are heat transfer tubes 8 each having a circular cross-sectional shape. For example, as shown in FIG. 81
The inner pipe 82 and the inner pipe 82 each have an elliptical cross-section, and the outer pipe 81 and the inner pipe 82 each have a rectangular cross-section as shown in FIG.
2 may have any cross-sectional shape, and the outer tube 8
1 and the inner tube 82 may have different cross-sectional shapes.

The conditions such as the size and the number of the outer pipe 81 and the inner pipe 82 to be installed are not particularly limited, but the following can be mentioned as an example of a suitable range.

The outer tube 81 has an effective length of about 20 to 200 mm, preferably about 40 to 100 mm, and the outer diameter (average) of the outer tube 81 is about 1.0 to 10.0 mm, particularly 1.5 to 10.
About 5.0 mm is preferable, and the inner diameter (average) of the outer tube 81 is
The thickness is preferably about 0.5 to 8.0 mm, particularly preferably about 0.8 to 4.0 mm.

The effective length of the inner tube 82 is preferably about 30 to 250 mm, particularly about 50 to 150 mm, and the outer diameter (average) of the inner tube 82 is about 0.5 to 8.0 mm, especially 0.8 to.
The inner diameter (average) of the inner tube 82 is preferably about 4.0 mm.
It is preferably about 0.2 to 7.0 mm, particularly about 0.4 to 3.0 mm.

The number of heat transfer tubes 8 (outer tube 81 and inner tube 82) to be installed is about 30 to 800, especially 50 to 50 when the dimensions of outer tube 81 and inner tube 82 are within the above range.
It is preferable that the number is zero.

The total effective surface area of the heat transfer tube 8 is 0.04 to
0.3 m ² about, particularly preferably in the 0.05～0.2M ² approximately.

Further, the tubular body 3, the cover members 4 and 5
As the constituent material of, for example, polycarbonate, acrylic resin, polyethylene terephthalate, polyethylene,
Examples thereof include polypropylene, polystyrene, polyvinyl chloride, acryl-styrene copolymer, acryl-butadiene-styrene copolymer and the like.

The liquid for heat exchange is not particularly limited, but water, aqueous solution, alcohol, etc. are preferably used.

In the heat exchanger 1A, the inlet 61
Inner surface, a surface forming the blood inflow space 91, an inner surface of the outer tube 81, an outer surface of the inner tube 82, a surface forming the blood inflow space 91,
An antithrombogenic substance may be coated on the inner surface of the outflow port 62 or the like that comes into contact with blood.

Next, the operation of the heat exchanger 1A will be described. Blood is introduced into the casing 2 through the inflow port 61, first flows into the blood inflow space 91, and then each heat transfer tube 8
The first flow path 92 flows from one end of the outer tube 81 into the first flow path 92 formed between the outer tube 81 and the inner tube 82.
The blood outflow space 9 from the other end of the outer tube 81.
3 to the outside of the casing 2 through the outlet 62.

On the other hand, the heat exchange liquid having a temperature different from that of blood is introduced into the casing 2 through the inflow port 63, first flows into the heat exchange liquid inflow space 101, and then each heat transfer tube 8 is introduced.
From one end of the inner pipe 82 into the second flow passage 102 formed inside the inner pipe 82, and flows in the second flow passage 102,
Further, from the other end of the inner pipe 82, the heat exchange liquid outflow space 103
Spill to. Next, this heat exchange liquid is used in the fourth flow path 10.
4 flows into the third flow passage 105 formed outside the outer pipe 81, flows in the third flow passage 105, and flows out of the casing 2 through the outlet 66.

While the blood flows in the first flow passage 92, the blood passes through the wall of the outer pipe 81 and the inner pipe 82, and the second flow passage 102.
And heat exchange is performed with the heat exchange liquid flowing through the third flow path 105. Thereby, the blood is cooled or heated to a desired temperature.

In the heat exchanger 1A having such a structure, the heat transfer tube 8 has a double tube structure composed of the outer tube 81 and the inner tube 82, and blood is allowed to flow through the first flow path 92 in the middle thereof (second flow path). Since the heat exchange liquid is caused to flow through both the passage 102) and the outside (third flow passage 105) to perform heat exchange, the heat transfer tube 8 is effective without increasing the volume of the first flow passage 92, that is, the priming amount of blood. The surface area can be increased and the heat exchange rate can be improved.

Further, in the heat exchanger 1A, the second flow path 10
The heat exchange liquid after passing through 2 is circulated to make the third flow path 1
05, the heat exchange liquid flow rate and pressure can be collectively controlled (adjusted), so that the heat exchange liquid can be easily controlled and the heat exchange liquid flow state can be controlled. The number of the heat exchange liquid inlets 63 and the outlets 66 can be minimized, and the structure can be simplified.

Particularly, in the heat exchanger 1A, the second flow path 102
Liquid exchange space 1 for heat exchange that communicates with the third flow path 105
03 and the fourth flow path 104 are both formed in the housing 2, the appearance of the heat exchanger is simple with as few protrusions as possible.

FIG. 2 is a vertical cross-sectional view showing another structural example of the heat exchanger of the present invention. The heat exchanger 1B shown in the same drawing is the same as the heat exchanger 1A except that the arrangement of the flow paths of the heat exchange liquid in the housing 2 is different. Hereinafter, only different points will be described, and description of similar matters will be omitted.

The housing 2 of the heat exchanger 1B has a heat exchange liquid outlet 6 at the center of the upper cover member 5 in FIG.
4 is formed to project, and an inflow port 65 for the heat exchange liquid is formed to project on the side surface of the tubular main body 3 opposite to the outflow port 66.

The outflow port 64 and the inflow port 65 are respectively the heat exchange liquid outflow space 103 and the third flow path 105.
Is in communication with.

The outlet 64 and the inlet 6 are also provided.
5 are connected in a liquid-tight manner by a pipe 11 such as a flexible tube.

In the heat exchanger 1B, blood flows into the inflow port 6
1 is introduced into the casing 2, and then, similarly to the heat exchanger 1A, is sequentially passed through the blood inflow space 91, the first flow path 92, and the blood outflow space 93, and then flows out of the casing 2 through the outflow port 62.

On the other hand, the heat exchange liquid having a temperature different from that of blood is introduced into the casing 2 through the inflow port 63, first flows into the heat exchange liquid inflow space 101, and then each heat transfer tube 8 is introduced.
The inner pipe 82 flows into the second flow passage 102 from one end, flows in the second flow passage 102, and further flows out from the other end of the inner pipe 82 into the heat exchange liquid outflow space 103. Next, the heat exchange liquid is once discharged from the outflow port 64 to the outside of the casing 2, passes through the fourth flow path 12 formed in the pipe 11, and again flows into the third flow path 105 from the inflow port 65. Then, it flows in the third flow path 105 and flows out of the casing 2 through the outlet 66.

While the blood flows in the first flow passage 92, the blood passes through the wall of the outer pipe 81 and the inner pipe 82 and the second flow passage 102.
And heat exchange is performed with the heat exchange liquid flowing through the third flow path 105. Thereby, the blood is cooled or heated to a desired temperature.

Also in the heat exchanger 1B having such a structure, the heat exchange rate can be improved without increasing the priming amount of blood, as in the heat exchanger 1A. Moreover, the flow rate and pressure of the heat exchange liquid can be collectively controlled (adjusted), and thus the management can be easily performed and the flow state of the heat exchange liquid can be made more appropriate. be able to.

FIG. 3 is a vertical cross-sectional view showing another structural example of the heat exchanger of the present invention. The heat exchanger 1C shown in the figure has the same configuration as the heat exchanger 1B except that the pipe 11 connecting the outflow port 64 and the inflow port 65 is not provided.

That is, this heat exchanger 1C has an inner tube 82
The heat exchange liquids flowing through the second flow passage 102 on the inner side and the third flow passage 105 on the outer side of the outer tube 81 are supplied in independent systems, respectively, with respect to the heat exchangers 1A and 1B. different.

In the heat exchanger 1C, blood flows into the inflow port 6
1 is introduced into the casing 2 and, similarly to the heat exchanger 1B, sequentially flows through the blood inflow space 91, the first flow path 92 and the blood outflow space 93, and then flows out of the casing 2 through the outflow port 62.

On the other hand, the heat exchange liquid introduced into the casing 2 through the inlet 63 is the heat exchange liquid inflow space 10
1. In the second flow path 102 of each heat transfer tube 8, the heat exchange liquid outflow space 103 is sequentially passed, the heat flows out of the casing 2 through the outflow port 64, and is introduced into the casing 2 through the inflow port 65. The replacement liquid passes through the third flow path 105 and flows out of the casing 2 through the outlet 66.

While the blood flows in the first flow passage 92, it passes through the wall of the outer pipe 81 and the inner pipe 82, and the second flow passage 102.
And heat exchange is performed with the heat exchange liquid flowing through the third flow path 105. Thereby, the blood is cooled or heated to a desired temperature.

Also in the heat exchanger 1C having such a structure, the heat exchange rate can be improved without increasing the priming amount of blood, as in the heat exchanger 1A.

Further, in the heat exchanger 1C, the system for supplying the heat exchange liquid to the second flow path 102 and the system for supplying the third flow path 105 are independent of each other.
The conditions such as the type (composition) of the heat exchange liquid flowing through the third flow path 105, the temperature, and the flow rate may be different from each other.

In the construction shown in FIGS. 1 to 3, the heat transfer tube 8
Is a straight tube, but it may be a tube bent into a desired shape such as a U shape or a spiral shape.

In the heat exchangers 1A and 1B, the inflow port 61 and the outflow port 62 are reversed and the inflow port 63 and the outflow port 6 are replaced.
6 may be used in reverse, and in the heat exchanger 1C,
The inflow port 61 and the outflow port 62 may be reversed, the inflow port 63 and the outflow port 64 may be reversed, and the inflow port 65 and the outflow port 66 may be reversed.

Contrary to the construction shown in FIGS. 1 to 3, the heat exchange liquid is caused to flow through the first flow passage 92 and the blood is caused to flow through the second flow passage 102 and the third flow passage 105. Good.

The heat exchanger of the present invention is not limited to the case of being applied to a heat exchanger for cooling or heating blood as shown in FIGS. May be for

Further, in the present invention, the first fluid is not limited to the above-mentioned blood, but may be any other body fluid such as plasma, liquid other than body fluid, gas, etc., and the same applies to the second fluid. is there.

Next, the heat exchanger of the present invention will be described in more detail with reference to specific examples.

Example 1 A heat exchanger having the structure shown in FIG. 1 was manufactured. 55 heat transfer tubes having a double-tube structure were arranged in parallel in the housing of this heat exchanger. The conditions such as the constituent materials, shapes, and dimensions of the outer tube and the inner tube in each heat transfer tube are as follows.

Outer tube and inner tube constituent materials: Stainless steel Outer tube and inner tube cross-sectional shape: circular Outer tube effective length: 60 mm Outer tube outer diameter: 3.10 mm Outer tube inner diameter: 2.80 mm Effective length of tube: 96mm Inner diameter of inner tube: 2.38mm Inner diameter of inner tube: 2.14mm Total effective surface area: 0.062m ² Priming amount in first flow path: 7.0ml

Example 2 A heat exchanger having the structure shown in FIG. 1 was manufactured. Eighty-five heat transfer tubes having a double tube structure were arranged in parallel in the housing of this heat exchanger. The conditions such as the constituent materials, shapes, and dimensions of the outer tube and the inner tube in each heat transfer tube are as follows.

Outer tube and inner tube material: Stainless steel Cross section shape of outer tube and inner tube: circular Effective length of outer tube: 60 mm Outer diameter of outer tube: 3.10 mm Inner diameter of outer tube: 2.85 mm Effective length of tube: 96mm Inner diameter of inner tube: 2.38mm Inner diameter of inner tube: 2.14mm Total effective surface area: 0.100m ² Priming amount in first channel: 13.9ml

Example 3 A heat exchanger having the structure shown in FIG. 2 was manufactured. The conditions of each heat transfer tube were the same as in Example 1.

Example 4 A heat exchanger having the structure shown in FIG. 2 was manufactured. The conditions of each heat transfer tube were the same as in Example 2.

Example 5 A heat exchanger having the structure shown in FIG. 3 was manufactured. The conditions of each heat transfer tube were the same as in Example 1.

Example 6 A heat exchanger having the structure shown in FIG. 3 was manufactured. The conditions of each heat transfer tube were the same as in Example 2.

Comparative Example A conventional heat exchanger having the structure shown in FIG. 7 was manufactured. This heat exchanger has a blood inlet 2 on the side.
1 and an outlet 22, an inlet 23 for a liquid for heat exchange at both ends
And outlets 24 have a housing 20 formed so as to face each other, and 313 heat transfer tubes 25 having a single-tube structure are arranged in the housing by embedding and fixing both ends thereof in partition walls 26 and 27, respectively. Was set up,
Blood flows inside each heat transfer tube 25, and a heat exchange liquid flows outside.

In this heat exchanger, the conditions such as the constituent material, shape and size of each heat transfer tube are as follows.

Material of heat transfer tube: Stainless steel Cross section shape of heat transfer tube: Circular Effective length of heat transfer tube: 95 mm Outer diameter of heat transfer tube: 1.11 mm Inner diameter of heat transfer tube: 0.84 mm Total effective surface area: 0.062 m ² (same as Example 1) Priming amount in heat transfer tube: 14.0 ml (2 of Example 1)
Times)

The following experiments were carried out using the heat exchangers of Examples 1, 2, 3, 4 and the comparative example.

[Experiment 1] Hot water of 37 ° C. was supplied to the inlet of the heat exchange liquid (second fluid) at a flow rate of 15000 ml / min, and cattle of 20 ° C. was supplied to the inlet of blood (first fluid). Blood (Hb = 12 g / dl) was supplied at a flow rate of 2000 ml / min to heat the bovine blood. The temperature of bovine blood flowing out from the blood outlet was measured, and the heat exchange capacity (heat exchange coefficient) of each heat exchanger was obtained from this measurement data. The results are shown in Table 1 below.

The following experiments were conducted using the heat exchangers of Examples 5 and 6 above.

[Experiment 2] Hot water of 37 ° C. was introduced into each of two inlets of the heat exchange liquid (second fluid) at a flow rate of 1500.
Supply at 0 ml / min and 15000 ml / min,
At the inlet of blood (first fluid), bovine blood at 20 ℃ (Hb = 12g /
dl) was supplied at a flow rate of 2000 ml / min to heat bovine blood. Measure the temperature of bovine blood flowing out of the blood outlet,
From this measurement data, the heat exchange capacity (heat exchange coefficient) of each heat exchanger was obtained. The results are shown in Table 1 below.

[0075]

[Table 1]

The heat exchange coefficient K in Table 1 is expressed by the following equation (1).

[0077]

[Equation 1]

As shown in Table 1 above, the heat exchangers of Examples 1, 3 and 5 all had the same total effective surface area of the heat transfer tubes as the heat exchanger of Comparative Example, The priming amount is as small as 1/2, and the heat exchange capacity is also improved.

The heat exchangers of Examples 2, 4 and 6 all had a total effective surface area of the heat transfer tube of about 1.6 while maintaining the same amount of blood priming as the heat exchanger of the comparative example. Can be doubled, resulting in significantly improved heat exchange capacity.

[Experiment 3] Experiment 1 except that each heat exchanger of Examples 1 to 4 was used and cold water at 20 ° C. was used instead of hot water.
Bovine blood (37 ° C.) was cooled in the same manner as in. Also,
Using each heat exchanger of Examples 5 and 6, 20
Except that cold water at ℃ was used, in the same manner as in Experiment 2, cow blood (3
(7 ° C.) was performed.

As a result, each of the heat exchangers of Examples 1 to 6 showed the same heat exchange capacity as in Table 1 above.

[0082]

As described above, according to the heat exchanger of the present invention, it is possible to reduce the priming amount of the first fluid and improve the heat exchange capacity.

Further, the heat exchanger of the present invention has a simple structure and is easy to assemble and handle a circuit. Also,
In the heat exchanger of the present invention, it is easy to set and adjust the conditions of the first and second fluids to be supplied, and it is possible to easily perform proper temperature management.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a configuration example of a heat exchanger of the present invention.

FIG. 2 is a vertical cross-sectional view showing another configuration example of the heat exchanger of the present invention.

FIG. 3 is a vertical cross-sectional view showing another configuration example of the heat exchanger of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a configuration example of a heat transfer tube in the present invention.

FIG. 5 is an enlarged cross-sectional view showing another example of the configuration of the heat transfer tube in the present invention.

FIG. 6 is an enlarged cross-sectional view showing another configuration example of the heat transfer tube in the present invention.

FIG. 7 is a vertical cross-sectional view showing a configuration example of a heat exchanger of a comparative example.

[Explanation of symbols]

 1A, 1B, 1C Heat exchanger 2 Housing 3 Cylindrical body 4, 5 Cover member 61 Inflow port 62 Outflow port 63 Inflow port 64 Outflow port 65 Inflow port 66 Outflow port 71, 72, 73, 74 Partition wall 8 Heat transfer tube 81 Outside Tube 82 Inner tube 91 Blood inflow space 92 First flow path 93 Blood outflow space 101 Heat exchange liquid inflow space 102 Second flow path 103 Heat exchange liquid outflow space 104 Fourth flow path 105 Third flow path 11 Tube 12 Fourth Flow path 20 Housing 21 Inlet 22 Outlet 23 Inlet 24 Outlet 25 Heat transfer tube 26, 27 Partition wall

Claims (1)

[Claims] 1. A housing, a first fluid inlet,
A first fluid outlet, a second fluid inlet, a second fluid outlet, and a plurality of heat transfer tubes installed in the housing, and the heat transfer tubes are used to A heat exchanger for exchanging heat between a first fluid and the second fluid, wherein each of the heat transfer tubes has a double tube structure including an outer tube and an inner tube, and the inner tube and the The first fluid is caused to flow through a first flow path formed between the outer pipe and a second flow path formed inside the inner pipe and a third flow path formed outside the outer pipe, respectively. A heat exchanger configured to flow the second fluid.