JPH0510694A - Heat transfer tube for heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat transfer tube for a heat exchanger, which can be simply designed inexpensively by a composite tube in which two types of fluids can flow. CONSTITUTION:A plurality of inner fins 21a directed inward, protrude to an inner wall of an outer tube 21 made of aluminum extrusion molded material. Inner tubes 23 made of aluminum extrusion molded material are engaged between the ends of the fins 21a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer tube for a heat exchanger, and more particularly to a heat transfer tube for a heat exchanger formed by fitting an inner tube inside an outer tube.

[0002]

2. Description of the Related Art Generally, a heat exchanger in which a plurality of tubes and a plurality of fins are combined in a predetermined shape to form a core for heat exchange, and a header tank is joined to both ends of the core is known. (For example, Japanese Patent Laid-Open No. 61-20
2085).

This type of heat exchanger is used for automatic oil coolers, intercoolers and the like, and the fluid flowing from one header tank is meandered through the above-mentioned tube and discharged from the other header tank. Is configured.

[0004]

However, the tube used in the conventional heat exchanger may be formed integrally with an extruded mold member made of aluminum, or an inner fin for promoting heat transfer may be inserted inside the extruded mold member. Each of them has a problem that only one type of fluid can flow inside the tube.

In order to solve this, various composite tubes capable of flowing two kinds of fluids have been proposed. However, the conventional composite tube of this type has a complicated structure and its manufacturing cost is high. At the same time, there is a problem that the whole becomes larger.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a composite tube capable of flowing two kinds of fluids, which is a low cost and compact heat exchange. It is to provide a heat transfer tube for dexterity.

[0007]

In order to achieve the above object, the present invention provides a plurality of inner fins which project inwardly on the inner wall of an outer tube made of an extruded aluminum material, and each inner fin. It is characterized in that an inner tube made of an extruded aluminum material is fitted between the tips.

[0008]

According to the present invention, the outer tube made of the aluminum extruded material and the inner tube 23 made of the same aluminum extruded material are molded in advance, and the inner tube 23 is simply fitted inside the outer tube. Since it is sufficient, the manufacturing thereof is extremely simple, the manufacturing cost is significantly reduced, and the inner space of the outer tube is effectively used, so that the whole is compact.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heat exchanger tube for a heat exchanger according to the present invention will be described below with reference to the accompanying drawings. In this specification, the left and right are based on FIG. 1, and the left is the first.
The left side and the right side in the figure refer to the same right side.

In FIGS. 1 and 2, 1 is a heat exchanger made of aluminum, 2 is a pair of left and right header plates 4 and 4 arranged opposite to each other, and 10 aluminum extruded mold members are held in parallel with each other. Tubes 5 and 5 are first tank parts provided on the left side of the left header plate 4 and the right side of the right header plate 4, respectively, and 6 is the left half of the lower first tank part 5 and the right side of the right first header plate 4. The second tank section is provided on the right side of the lower half of the first tank section 5.

As shown in FIG. 3, each tube 2 is an outer tube 2 made of an aluminum extruded material.
1 and the inner tube 23, the inner wall of the outer tube 21 is integrally provided with a plurality of inner fins 21a, 21a ... An inner tube 23 is press-fitted between the respective tips of the inner fins 21a, 21a ... 21a. Inside the inner tube 23, a corrugated inner fin 23a is formed.
Are arranged.

That is, each tube 2 is a so-called composite tube, and is formed by press-fitting an inner tube 23 also made of an extruded material inside an outer tube 21 made of an extruded material and then so-called brazing joining them. The inside of the inner tube 23 forms the inner flow path 3a, and the inner tube 23 and the outer tube 21
The space between and forms the outer flow path 3b.

Since the outer tube 21 and the inner tube 23 are made of an aluminum extruded material, their shapes can be arbitrarily formed. For example, inside the inner tube 23, as shown in FIG.
3a can also be integrally molded. Further, the outer tube 21 and the inner tube 23 may be made of extruded material tubes each having a fin, as shown in FIG. Note that these are merely examples, and various modifications can be made.

Of the 10 tubes 2, the 5 tubes 2 above the heat exchanger 1 are the outer tubes 2
1 and the inner tube 23 have the same length, and both ends of the flow paths 3a and 3b of each tube 2 are opened in the first tank portions 5 and 5. Further, in the five tubes 2 below the heat exchanger 1, the length of the inner tube 23 is longer than the length of the outer tube 21, and both ends of the outer flow path 3b of the flow paths 3 of each tube 2 are the first. The inner tube 23 is opened in the first tank portions 5 and 5 and extends through the first tank portions 5 and 5, and both ends of the inner flow passage 3a are opened in the second tank portions 6 and 6. ing. here,
Each tube 2 is formed by fitting an inner tube 23 made of an aluminum extruded material into an outer tube 21 made of an aluminum extruded material.
It is easy to make both lengths equal or different.

Reference numeral 7 is a first fluid introduction pipe connected to the upper end of the side surface of the left first tank portion 5, and 8 is a first fluid discharge pipe connected to the upper end of the side surface of the right first tank portion 5. , 9 is a second fluid introduction pipe connected to the lower surface of the right second tank portion 6, 10 is a second fluid discharge pipe connected to the lower surface of the left second tank portion 6, and 11 and 12 are left and right Upper and lower both side plates fixed to both upper and lower end portions of both header plates 4 and 4, and 13 is interposed between vertically adjacent tubes 2 and 2 and between upper and lower both side plates 11 and 12 and tube 2. Corrugated fins.

In the heat exchanger 1, for example, water is used as the first fluid and oil is used as the second fluid, whereby one heat exchanger 1 serves as two heat exchangers, a radiator and an oil cooler. Can be achieved.

That is, water is introduced from the first fluid introducing pipe 7 of the heat exchanger 1 into the left first tank portion 5, and oil is introduced from the second fluid introducing pipe 9 into the right second tank portion 6. . Here, the water introduced into the left first tank unit 5 is the heat exchanger 1
It passes through all the flow passages 3a and 3b of the upper five tubes to reach the inside of the right first tank portion 5, and passes through the inside flow passages 3a of the five tubes 2 below the heat exchanger 1 to the right. It reaches the inside of the first tank unit 5. During this time, the water is cooled by exchanging heat with the air through the pipe wall and the corrugated fins 13, and the cooled water is discharged from the first fluid discharge pipe 8. On the other hand, the oil introduced into the right second tank portion 6 passes through the outer flow passages 3b of the five tubes 2 below the heat exchanger 1 and reaches the left second tank portion 6, during which the pipe wall and corrugate It is cooled by exchanging heat with air via the fins 13. Therefore, one heat exchanger 1 can serve as two types of heat exchangers, a radiator and an oil cooler.

When the heat exchanger 1 is used, for example, as a radiator, water is used as the first fluid and the second fluid is used as the second fluid.
When a refrigerant from another heat exchanger (not shown) is used as the fluid, the water is cooled by the air as well as the refrigerant, so that the water can be cooled rapidly in a short time, and the heat exchange efficiency can be improved. Can be significantly improved and can be made compact.

However, according to this embodiment, a heat transfer tube for a heat exchanger suitable for use in this type of heat exchanger is provided, in which the inner wall of the outer tube 21 made of aluminum extruded material is provided. , A plurality of inner fins 21a, 21a, ..., 21a directed inward are integrally projected, and an inner tube 23 also made of an aluminum extruded material is fitted between the respective tips of the inner fins 21a, 21a, ... 21a. Therefore, the manufacturing thereof is extremely simple, the manufacturing cost is significantly reduced, and the inner space of the outer tube 21 can be utilized very effectively, so that the whole can be designed compact.

[0020]

As is apparent from the above description, according to the present invention, the inner tube made of the aluminum extruded material is fitted inside the outer tube made of the aluminum extruded material. The tube is extremely simple, the manufacturing cost of the tube is significantly reduced, and the inner space of the outer tube can be used very effectively, so that the overall size can be made compact.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an example of a heat exchanger to which the present invention is applied.

FIG. 2 is a perspective view of the same.

FIG. 3 is a transverse sectional view showing an embodiment of a heat transfer tube for a heat exchanger of the same.

FIG. 4 is a transverse sectional view showing another embodiment of the inner tube.

FIG. 5 is a transverse cross-sectional view showing another embodiment of the heat transfer tube for the heat exchanger of the same.

[Explanation of symbols]

 1 Heat Exchanger 2 Tube 3a Inner Channel 3b Outer Channel 4 Header Plate 5 First Tank Section 6 Second Tank Section 21 Inner Tube 23 Outer Tube

Claims (1)

Claims: 1. A plurality of inner fins directed inward are integrally provided on an inner wall of an outer tube made of an aluminum extruded shape material, and the inner fin made of the aluminum extruded shape material is provided between respective tips of the inner fin. A heat transfer tube for a heat exchanger, characterized by being fitted with the inner tube of.