JPH10332294A - Tube for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube for a heat exchanger used for a heat exchanger of a condenser, a radiator or the like which can be assuredly brazed by a simple means and has a high pressure resistant strength. SOLUTION: A plurality of protrusions 21a protruding inward are opposed to each other on the inner surface of a long size tube main body 21 and the ends of the protrusions 21a abut mutually on others. In this case, protruding parts 21d abutting on the peripheral edge of the tube hole 25a of a header pipe 25 or a header plate are formed on the outer peripheries of the opened ends 21c of the tube main body 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger tube used for a heat exchanger such as a condenser or a radiator.

[0002]

2. Description of the Related Art Generally, in a heat exchanger such as a condenser,
A heat exchanger tube for circulating a high-pressure heat exchange fluid in the heat exchange section is provided. Conventionally, such a heat exchanger tube is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-15998.
No. 6 is known.

FIG. 6 shows a heat exchanger using a heat exchanger tube of this type, in which a tube body 3 and a radiating fin 5 are laminated between header pipes 1 arranged opposite to each other. The open end 3a of the tube body 3 is inserted into the tube hole 1a of the header pipe 1 and brazed.

[0004] Side plates 7 are arranged on both sides of the tube body 3 and the radiation fins 5 in the stacking direction.
Are brazed to each other. As shown in FIGS. 7 and 8, a plurality of protrusions 3 b protruding inward are arranged on the tube main body 3 so as to face each other.

[0005] The tips of the projections 3b are in contact with each other,
Be brazed. On one side of the tube body 3, an edge 3c is formed along the longitudinal direction, and the edge 3c is brazed to each other. As shown in FIG. 9, this type of heat exchanger tube is formed by bending a long plate material 9 made of a clad material such as aluminum having a brazing material layer from the center, and forming a tip of the projection 3b and an edge 3c. Are formed by abutting each other.

[0006] Then, a heat exchanger is manufactured by using the heat exchanger tube thus formed as described below. That is, first, as shown in FIG. 10, the tube bodies 3 and the radiation fins 5 are alternately stacked and arranged, and the side plates 7 are arranged on both sides in the stacking direction. Next, the open end 3a of the tube body 3 and the end 7a of the side plate 7 are inserted into the tube hole 1a of the header pipe 1.

Further, a heat treatment jig 9 is arranged outside the side plate 7 and heat treatment is performed while the tube body 3 and the radiation fins 5 are pressed from both sides in the laminating direction. By this heat treatment, the distal end of the projection 3b and the edge 3c of the tube body 3 are brazed in a state where they are pressed against each other. At the same time, the open end 3a and the tube hole 1a, the tube body 3, the radiating fins 5 and the side plate 7 are brazed to each other to manufacture a heat exchanger.

The projections 3b brazed to each other improve the pressure resistance of the tube body 3 and allow a high-pressure heat exchange fluid to flow through the tube body 3. Further, since the heat exchange fluid flows while being stirred by these projections 3b, the heat exchange efficiency is improved.

[0009]

However, in such a conventional tube for a heat exchanger, since the pressing at the time of brazing is performed only by the baking jig 9, the pressing force is reduced.
Not sufficiently transmitted to the vicinity of the opening end 3a of the tube body 3,
There is a possibility that the tips of the protrusions 3b located on the side of the opening end 3a do not sufficiently contact each other, so that brazing cannot be performed.

If the tip of the projection 3b is not brazed, the flow pressure of the heat exchange fluid concentrates on the edge 3c.
There is a possibility that the pressure resistance of the tube body 3 is reduced. The present invention has been made to solve such a conventional problem, and it is possible to reliably perform brazing by simple means,
An object of the present invention is to provide a heat exchanger tube having high pressure resistance.

[0011]

According to a first aspect of the present invention, there is provided a heat exchanger tube in which a plurality of inwardly projecting protrusions are formed on the inner surface of a long tube body and opposed to each other. Are formed on the outer periphery of the opening end of the tube main body, and a projection is formed on the outer periphery of the opening end of the tube main body to abut on the periphery of the tube hole of the header pipe or the header plate.

According to a second aspect of the present invention, in the heat exchanger tube according to the first aspect, the projecting portion is formed along an outer periphery of the tube main body. A heat exchanger tube according to a third aspect of the present invention is the heat exchanger tube according to the second aspect, wherein an outer periphery of the header pipe or the header plate has an arc shape in cross section, and the protrusion has a shape corresponding to the arc shape. (21d)
Is formed.

[0013] The heat exchanger tube according to claim 4 is the heat exchanger tube according to any one of claims 1 to 3,
The tube body is formed by bending a long aluminum clad material having a brazing material layer.

(Operation) In the tube for a heat exchanger according to the first aspect, a protruding portion is formed on the outer periphery of the open end of the tube main body so as to be in contact with the peripheral edge of the tube hole of the header pipe or the header plate. When the open end is inserted into the tube hole, the protruding portion is pressed by the peripheral edge of the tube hole, and by this pressing force, the tips of the protruding portions on the open end side of the tube main body are sufficiently pressed against each other. Brazed.

In the heat exchanger tube according to the second aspect, the projecting portion is formed along the outer periphery of the tube main body, and the projecting portion contacts the tube hole with the projecting portion closing the peripheral edge of the tube hole. . In addition, when the tube body is inserted into the tube hole, the protrusion functions as a stopper, so that the tube body is fitted to a predetermined position of the header pipe without using a positioning jig.

In the heat exchanger tube according to the third aspect, the protruding portion is formed in an arc shape in accordance with the outer peripheral shape of the arc-shaped header pipe or the header plate, and the tube body is easily and reliably formed on the header pipe or the header plate. Inserted and abutted.

In the tube for a heat exchanger according to the fourth aspect, the tube body is easily formed by bending an aluminum clad material having a brazing material layer.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment (corresponding to claims 1 to 4) of a heat exchanger tube according to the present invention. In FIG. 1, reference numeral 21 is made of, for example, an aluminum clad material. Tube body. The tube main body 21 has a long flat tube shape, and a plurality of protrusions 21a protruding inward are formed on the tube main body 21 so as to face each other.

An edge 21b is formed on one side of the tube body 21 along the longitudinal direction. These projections 21a
And the edge 21b are in contact with each other and brazed. On the outer periphery of the open end 21c of the tube main body 21, a protruding portion 21d that protrudes in an arc shape is formed.

The shape of the protruding portion 21d is formed corresponding to the outer peripheral shape of the header pipe described later. As shown in FIG. 2, the above-mentioned tube main body 21 forms a projection 21a, an edge 21b, and a projection 21d on a cladding material 23 having a brazing material layer, and then bends the cladding material 23 from the center to project the projection. The tip of the portion 21a and the edge 21b are formed by abutting each other.

Then, a heat exchanger is manufactured using the tube body 21 formed as described above, as described below. That is, first, as shown in FIG. 3, the tube bodies 21 and the radiation fins 27 are alternately stacked between the header pipes 25 that are arranged opposite to each other, and the side plates 29 are arranged on both sides in the stacking direction.

Next, a printing jig 31 is arranged outside the side plate 29, and the tube body 21 and the radiation fins 27 are pressed from both sides in the stacking direction. As shown in FIG. 4, the open end 21c of the tube main body 21 is inserted into the tube hole 25a of the header pipe 25, and the protruding portion 21d is brought into contact with the tube hole 25a in a state where the peripheral edge of the tube hole 25a is closed. Positioning of the header 21 and the header pipe 25 is completed.

At this time, as shown in FIG.
, A pressing force P is generated toward the inside of the tube main body 21, and the tips of the protrusions 21 a located on the header pipe 25 side where the pressing force of the printing jig 31 is not easily applied are sufficiently pressed to each other. In this state, heat treatment is performed, and the projection 21a and the edge 21b of the tube main body 21 are brazed to each other, and at the same time, the tube main body 21, the header pipe 25, the radiation fins 27, and the side plates 29 are integrally brazed. , A heat exchanger is manufactured.

In the heat exchanger tube configured as described above, a protrusion 21d is formed on the outer periphery of the open end 21c of the tube body 21, and the open end 21
c is inserted into the tube hole 25a of the header pipe 25, the tube body 2
1, the pressing portion P presses the protruding portion 21d inward.
Can be sufficiently pressed against each other, and the tube main body 21 can be reliably brazed by simple means. For this reason, the tube body 21 having high pressure resistance is provided.
Can be formed.

Further, since the projecting portion 21d is formed in a shape corresponding to the outer peripheral shape of the tube main body 21, the projecting portion 2d is formed.
By 1d, the tube hole 25a of the header pipe 25 can be closed, and the open end 21c of the tube main body 21 can reliably contact the tube hole 25a.
When the tube main body 21 is inserted into the tube hole 25a, the protrusion 21d functions as a stopper.
Tube body 2 easily without using positioning jig
1 and the header pipe 25 can be aligned.

Further, since the arc-shaped projecting portion 21d is formed so as to conform to the outer peripheral shape of the cylindrical header pipe 25, the tube body 21 can be easily and reliably inserted into and abutted on the header pipe 25. Furthermore, since the tube main body 21 is formed by bending the aluminum clad material 23, the tube main body 21 can be easily formed, and the brazing material layer on the surface of the clad material 23 ensures the formation of the tube main body 21. The protrusion 21a and the edge 21b can be brazed to each other.

In the above-described embodiment, an example has been described in which the heat exchanger is formed by inserting the tube main body 21 into the tube hole 25a of the header pipe 25. However, the present invention is limited to this embodiment. Instead, for example, a heat exchanger may be formed by using a header plate having an arcuate cross section and inserting the tube body 21 into the tube hole of the header plate.

Further, in the above-described embodiment, an example is described in which the arc-shaped protruding portion 21d is formed on the tube main body 21 in correspondence with the outer peripheral shape of the cylindrical header pipe 25, but the present invention relates to such an embodiment. However, the present invention is not limited to this. For example, a linear protrusion 21d may be formed on the tube body 21 corresponding to the outer peripheral shape of the header pipe 25 having a rectangular cross section.

[0030]

According to the heat exchanger tube of the first aspect, a projecting portion is formed on the outer periphery of the open end of the tube main body, and when the open end of the tube main body is inserted into the tube hole of the header pipe or the header plate. Since the peripheral portion of the tube hole pressed the protruding portion into the tube body,
With this pressing force, the tips of the protrusions located on the header pipe side or the header plate side can be sufficiently pressed against each other, and brazing can be surely performed by simple means.

Therefore, a tube main body having high pressure resistance can be formed. In the heat exchanger tube according to the second aspect, since the projecting portion is formed along the outer periphery of the tube main body, the tube hole can be closed by this projecting portion, and the open end of the tube main body can be securely connected to the tube hole. You can abut. In addition, when the tube body is inserted into the tube hole, the protrusion functions as a stopper, so that the tube body can be easily aligned with the header pipe or the header plate without using a positioning jig.

In the heat exchanger tube according to the third aspect, since the arc-shaped projection is formed so as to conform to the outer peripheral shape of the header pipe or the header plate having an arc-shaped cross section, the tube body can be easily attached to the header pipe or the header plate. Can be inserted and contacted. In the tube for a heat exchanger according to the fourth aspect, since the tube main body is formed by bending the aluminum clad material, the tube main body can be easily formed, and the brazing material layer on the surface of the clad material ensures the formation. The projections of the tube body can be brazed together.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a heat exchanger tube of the present invention.

FIG. 2 is a perspective view showing a state in which a tube main body is formed using a clad material.

FIG. 3 is a front view showing an assembled state of the heat exchanger.

FIG. 4 is a sectional view showing details of a main part of FIG. 3;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a front view showing a heat exchanger using a conventional heat exchanger tube.

FIG. 7 is a sectional view showing details of a main part of FIG. 6;

8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a perspective view showing a state in which a conventional tube main body is formed using a clad material.

FIG. 10 is a front view showing an assembled state of a heat exchanger using a conventional heat exchanger tube.

[Explanation of symbols]

 21 Tube Main Body 21a Projection 21c Open End 21d Projection 25 Header Pipe (Header Plate) 25a Tube Hole

Claims (4)

[Claims] 1. A plurality of projecting portions (21a) projecting inwardly are formed on the inner surface of a long tube body (21), and the tips of these projecting portions (21a) abut each other. In the heat exchanger tube, a protrusion (21) abutting on the outer periphery of the open end (21c) of the tube body (21) and the peripheral edge of the tube hole (25a) of the header pipe (25) or header plate.
A tube for a heat exchanger obtained by forming d). 2. The heat exchanger tube according to claim 1, wherein the projecting portion (21d) is formed along an outer periphery of the tube body (21). 3. The heat exchanger tube according to claim 2, wherein an outer periphery of the header pipe (25) or the header plate has an arc shape in cross section, and the protrusion (21d) has a shape corresponding to the arc shape. ) Is formed. 4. The heat exchanger tube according to claim 1, wherein the tube body (21) is made of a long aluminum clad material (23) having a brazing material layer. A tube for a heat exchanger, which is formed by bending.