Heat exchanger

Abstract

A tube 2 is composed of a first plate 6 and a second plate 7 which are opposed and engaged with each other. In a region C on both end sides of the tube 2, the first plate 6 is formed into a shape in which an edge portion 6a of the first plate is laid along a bent portion 7b of the second plate so that an outer wall face of the tube will be composed of continuous face. In a region D except for both end sides of the tube 2, the first plate 6 is formed into a shape in which the edge portion 6a of the first plate 6 is laid between the edge portion 7a of the second plate 7 and the bent portion 7b.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a front view of a heat exchanger of the first embodiment of the present invention;

FIG. 2 is a sectional view taken on line II-II in FIG. 1;

FIG. 3 is a sectional view taken on line III-III in FIG. 1;

FIG. 4 is a perspective view showing the neighborhood of the tube edge portion shown in FIG. 1;

FIG. 5 is an enlarged view showing an engagement portion of the tube 6 and the header plate 4a in FIG. 1;

FIG. 6 is a view showing circumstances at the time of brazing the tube 6 to the header plate 4a in FIG. 1;

FIG. 7 is a view of a comparative example of the first embodiment showing circumstances in which the tube 6 and the header plate 4a are brazed mutually in the case where the outer fin 3 is packed even to a portion right below the header plate 4a;

FIG. 8 is a sectional view taken on line II-II in FIG. 1 in the comparative example of the first embodiment;

FIG. 9 is a lateral sectional view of the tube of the second embodiment of the present invention;

FIG. 10 is a lateral sectional view of the tube of the second embodiment of the present invention;

FIG. 11 is a lateral sectional view of the tube of the third embodiment of the present invention;

FIG. 12 is a lateral sectional view of the tube of the third embodiment of the present invention; and

FIG. 13 is a lateral sectional view of the tube into which the present inventors made investigation.

Claims

1. A heat exchanger comprising: a tube in which an inner fin is arranged;header plates, which are arranged on both end sides in a longitudinal direction of the tube, with an opening portion of which the tube is engaged; andan outer fin partially provided in an outer circumferential direction of the tube on an outer wall face of the tube, in a portion of the tube except for an engagement portion with the header plates, whereinthe tube is formed in such a manner that plates, which compose the tube, are brazed mutually in a portion where the plates are put on mutually while a first edge portion of the plate composing the tube is being located outside a second edge portion of the tube,a position of the first edge portion of the plate in an engagement portion of the tube with the header plates and a position of the first edge portion of the plate in a portion except for the engagement portion of the tube with the header plates are different mutually, andin the engagement portion, the first edge portion is located at a position so that an outer wall face of the tube will be composed of a continuous face, and in the portion except for the engagement portion, the first edge portion is located in a portion, the first edge portion is located in a portion on the outer wall face where the outer fin is not provided.

2. A heat exchanger according to claim 1, wherein a lateral cross-section of the tube is formed into a substantial rectangle,the outer fin is provided only on an outer wall face of the tube which is a long side of the rectangle,the tube is composed in such a manner that a first plate, the lateral cross-section of which is formed into a substantial C-shape, and a second plate, the lateral cross-section of which is also formed into a substantial C-shape, are opposed and engaged mutually so that a portion of the first plate, which becomes a short side of the rectangle, and a portion of the second plate, which becomes a short side of the rectangle, can be put on mutually, andthe first and the second plate are formed in such a manner that in the portion in which the tube and the header plate are engaged mutually, the edge portion of the plate located outside in the portion where the first and the second plate are put on mutually reaches a bent portion of the outer plate so that an outer wall face of the tube will be composed of a continuous face, and in the portion except for the portion in which the tube and the header plate are engaged mutually, the edge portion of one plate located outside in the portion where the first and the second plate are put on mutually is located between the edge portion of the other plate and the bent portion.

3. A heat exchanger according to claim 1, wherein a lateral cross-section of the tube is formed into a substantial rectangle,the outer fin is provided only on an outer wall face of the tube which is a long side of the substantial rectangle,the tube is composed in such a manner that one end side and the other end side of one plate are put on each other in a portion which becomes a short side of the rectangle of the tube while one end side is being set outside, andthe plate is formed into a shape in which in the engagement portion in which the tube and the header plate are engaged mutually, one end is located in the bent portion on the other end side so that an outer wall face of the tube will be composed of a continuous face, and in the portion except for the engagement portion in which the tube and the header plates are engaged mutually, one end is located between the other end and the bent portion.

4. A heat exchanger according to claim 1, wherein the outer fin is arranged on a side distant from the header plates with respect to the displacement portion in which a position of the edge portion of the header plate is changed in the longitudinal direction of the tube.

5. A heat exchanger according to claim 2, wherein the outer fin is arranged on a side distant from the header plates with respect to the displacement portion in which a position of the edge portion of the header plate is changed in the longitudinal direction of the tube.

6. A heat exchanger according to claim 3, wherein the outer fin is arranged on a side distant from the header plates with respect to the displacement portion in which a position of the edge portion of the header plate is changed in the longitudinal direction of the tube.