JP2005030700A - Tube fixing part structure of heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube fixing part structure of a heat exchanger that can prevent molten solder from flowing down to an end face of a tube fitted in an insertion groove in an inner member while ensuring soldering strength of the tube. <P>SOLUTION: An end 3a of the tube 3 inserted into an insertion hole 14 formed in an outer member 10 of a header tank 2 is fitted in the insertion groove 15 formed in an inner side of the inner member 11, and then soldered to the insertion hole 14. The insertion groove 15 is provided with a wide portion 16 having an inside width W2 larger than an inside width W1 of the insertion hole 14 to prevent molten solder R from developing capillarity in a gap δ2 against the tube 3 fitted, so that when the tube 3 is soldered to the insertion hole 14, the molten solder R stops in the wide portion 16 that prevents it from flowing down to the end face 3b of the tube 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tube mounting portion structure that is inserted into a header tank of a heat exchanger and brazed.

  The heat exchanger has a configuration in which a plurality of tubes arranged in parallel communicate with each other between a pair of opposed header tanks to circulate a heat exchange fluid, and fins for heat dissipation are interposed between the tubes.

  When carbon dioxide, which is a supercritical fluid, is used as the heat exchange fluid in the refrigeration cycle and heat pump cycle, the internal pressure is increased, so the pressure strength of the header tank must be ensured. As a multi-row hole structure in which a plurality of circular cylindrical portions are arranged side by side, stress concentration due to high pressure is avoided, and an extruded material or a pressed product is used as a component (for example, (See Patent Document 1).

In this case, the header tank is formed by joining the outer member and the inner member by caulking to form a hollow with a multi-row hole structure, and the end portion of the tube is inserted through the insertion hole formed in the outer member and brazed. It is like that.
Japanese Patent Laid-Open No. 11-351784 (pages 6, 7 and 9, 17)

  By the way, in such a conventional tube mounting structure, an insertion groove is formed in the inner member of the header tank at a position corresponding to the insertion hole of the outer member, and the tube inserted into the insertion hole of the outer member is inserted. By fitting the end portion into the insertion groove of the inner member, the tube can be positioned and stably fixed.

  In this case, if the inner widths of the insertion hole and the insertion groove are formed to be equal, the brazing material melted when brazing the tube enters the gap between the insertion groove and the tube from the gap between the insertion hole and the tube. The brazing material melted by the capillary phenomenon further penetrates into the insertion groove and reaches the distal end surface of the tube, and eventually clogs the distal end opening of the tube.

  Therefore, in view of such conventional problems, the present invention provides heat exchange that can prevent the molten brazing material from flowing around the distal end surface of the tube fitted in the insertion groove of the inner member while ensuring the brazing strength of the tube. It aims at providing the tube attachment part structure of a vessel.

  In order to achieve such an object, in the tube mounting portion structure of the heat exchanger of the present invention, a header tank having a hollow interior and an end portion inserted through an insertion hole formed in an outer member of the header tank are provided. A tube that fits into an insertion groove formed on the inner side of the inner member and brazes between the insertion hole and the insertion groove at a gap between the tube fitted into the insertion groove. An amplification portion having an inner width larger than the inner width of the insertion hole is formed so that the molten brazing material does not exhibit a capillary phenomenon.

  According to the present invention having such a configuration, the amplifying portion is formed in the insertion groove for fitting the end portion of the tube, and the molten brazing material is capillary action in the gap between the tube and the tube fitted in the insertion groove. Therefore, when brazing between the insertion hole of the outer member and the tube inserted into this, the molten brazing material stops at the amplification part where the inner width of the insertion groove is increased, and the tip of the tube Therefore, it is possible to prevent the tube from opening around the surface, and consequently, clogging the tip opening of the tube with the brazing material.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1 to 3 show a first embodiment of a tube mounting portion structure of a heat exchanger according to the present invention, FIG. 1 is an overall perspective view of the heat exchanger, and FIG. 2 is taken along line AA in FIG. FIG. 3 is an enlarged longitudinal sectional view of the header tank taken along line BB in FIG.

  As shown in FIG. 1, a heat exchanger 1 to which the tube mounting portion structure of the present invention is applied communicates with a pair of header tanks 2, 2 having a hollow interior and straddling the header tanks 2, 2. A plurality of flat tubes 3 arranged in parallel and fins 4 attached between the plurality of tubes 3 are generally configured to cool from one header tank 2 to the other header tank 2 via the tube 3. A heat exchange fluid such as water is allowed to flow, and while the heat exchange fluid flows through the tube 3, heat exchange with other heat exchange fluid such as an air flow passing through the fins 4 is performed.

  As shown in FIG. 2, the header tank 2 includes a plate 10 as an outer member formed by bending an aluminum clad material into a U shape by pressing, and a block 11 as an inner member formed by extruding an aluminum material, The block 11 is fitted inside the U-shaped plate 10, and the crimped portions 10 a protruding like comb teeth on both sides of the plate 10 are crimped on both sides of the block 11 to be integrated. .

  The block 11 has a pair of grooves 11b, 11b having a substantially semicircular cross section on both sides provided with a boundary wall 11a at the center of the inner side (the inner side is the lower side in FIG. 2 on the side where the tube 3 is disposed). And a pair of cylindrical portions 12 and 12 hermetically sealed by covering the insides of the grooves 11b and 11b with the plate 10, and the cylindrical tanks 12 and 12 form a header tank having a multi-row hole structure. 2 is configured.

  Of course, both ends of the header tank 2 are closed by caps 13 as shown in FIG.

  As shown in FIG. 2, the plate 10 is formed with an insertion hole 14 into which the tube 3 is inserted, and the end 3 a of the tube 3 is fitted into the boundary wall 11 a provided inside the block 11. The insertion groove 15 is formed with a predetermined depth D, and the tube 3 is brazed to the periphery of the insertion hole 14 with the end 3a of the tube 3 inserted from the insertion hole 14 fitted into the insertion groove 15. In addition, the liquid-tightness is maintained.

  At this time, a gap δ1 is appropriately provided between the distal end surface 3b of the tube 3 and the bottom surface 15a of the insertion groove 15 in order to ensure the communication between the cylindrical portions 12 and 12 on both sides.

  Here, in the first embodiment, as shown in FIG. 3, the brazing material R melted in the gap δ2 between the insertion groove 15 and the tube 3 fitted in the insertion groove 15 exhibits a capillary phenomenon. In order to avoid this, an amplification portion 16 having an inner width W2 larger than the inner width W1 of the insertion hole 14 is formed (claim 1).

  In this embodiment, the amplification portion 16 is formed over the entire insertion groove 15 (Claim 2).

  With the above configuration, according to the tube mounting portion structure of the heat exchanger of the first embodiment, the insertion groove 15 into which the end portion 3a of the tube 3 is fitted has an inner width W2 that is greater than the inner width W1 of the insertion hole 14. By forming the amplifying portion 16 to be large and preventing the molten brazing material R from exhibiting the capillary phenomenon in the gap δ2 between the tube 3 fitted in the insertion groove 15, the insertion hole of the plate 10 When brazing between 14 and the tube 3 inserted into this, the molten brazing material R stops at the amplification portion of the insertion groove 15 where the inner width W2 is increased to form a fillet 17, and the brazing material R It is possible to prevent the tube 3 from wrapping around the distal end surface, and consequently to prevent the distal end opening of the tube 3 from being clogged with the brazing material R.

  In the first embodiment, since the amplification portion 16 is formed over the entire insertion groove 15, when the end portion 3 a of the tube 3 inserted from the insertion hole 14 is fitted into the insertion groove 15, these amplification portions 16 are formed. A dimensional allowance can be provided between the tube 3 and the insertion groove 15, and as a result, high accuracy is not required when the plate 10 and the block 11 are assembled, thereby improving productivity and reducing costs. can do.

(Second Embodiment)
4 and 5 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 5 is an enlarged vertical sectional view of a main part of the header tank.

  In the tube mounting portion structure of the second embodiment, the amplification portion 16 formed in the insertion groove 15 of the block 11 is limited to the bottom portion 15b of the insertion groove 15 (Claim 3).

  The inner width W 3 of the inlet portion 15 c of the insertion groove 15 is substantially equal to the inner width W 1 of the insertion hole 14 of the plate 10.

  Therefore, according to the second embodiment, the distal end portion 3a of the tube 3 is positioned at the amplification portion 16, and the molten brazing material R goes around the distal end opening portion of the tube 3 as in the first embodiment. In particular, in this second embodiment, the inner width W3 of the inlet portion 15c of the insertion groove 15 can be made substantially equal to the inner width W1 of the insertion hole 14 of the plate 10, so that the brazing material R melted when brazing is used. Since it rotates around the inlet portion 15c of the insertion groove 15, the end 3a of the tube 3 can be fixed by the insertion hole 14 and the inlet portion 15c of the insertion groove 15, so that the coupling strength of the tube 3 can be increased.

(First Modification of Second Embodiment)
FIG. 6 shows a modification of the second embodiment, in which the same components as those in the second embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 6 is an enlarged vertical section of the main part of the header tank. FIG.

  In the tube mounting portion structure of this embodiment, a chamfer 15 d is formed at the entrance of the insertion groove 15 formed in the block 11.

  Therefore, according to this embodiment, even when the inner width W3 of the inlet portion 15c of the insertion groove 15 is substantially equal to the inner width W1 of the insertion hole 14, the chamfer 15d formed at the inlet of the insertion groove 15 is the guide portion. Thus, the insertion property of the tube 3 can be improved.

  In this embodiment, a circular arc surface can be formed instead of the chamfer 15d.

(Third embodiment)
FIG. 7 shows a third embodiment of the present invention, in which the same components as those in the above-described embodiments are denoted by the same reference numerals and redundant description is omitted. FIG. FIG.

  In the tube mounting portion structure of the second embodiment, as shown in FIG. 7, a gap forming means 18 that secures a gap between the bottom surface 15 a of the insertion groove 15 and the distal end surface 3 b of the tube 3 is formed. (Claim 4).

  In this embodiment, the gap forming means 18 is an inclined surface 18a in which the bottom surface 15a is inclined with respect to the distal end surface 3b of the tube 3 (Claim 5).

  In this embodiment, the inclined surface 18a is formed by inclining the bottom surface 15a of the insertion groove 15 in one direction as a whole.

  Therefore, according to the third embodiment, when the tube 3 is assembled, when the tube 3 is inserted from the insertion hole 14 of the plate 10 and fitted into the insertion groove 15 of the block 11, the distal end surface 3b of the tube 3 is inserted. Since the inclined surface 18a is formed on the bottom surface 15a even when it hits the bottom surface 15a of the insertion groove 15, it is possible to prevent the distal end opening of the tube 3 from being blocked by the bottom surface 15.

  For this reason, when assembling the tube 3, it is possible to braze the distal end surface 3 b of the tube 3 against the bottom surface 15 of the insertion groove 15, so that the assembling workability can be improved.

(First Modification of Third Embodiment)
FIG. 8 shows a modification of the third embodiment, in which the same components as those in the third embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 8 is an enlarged vertical section of the main part of the header tank. FIG.

  In the tube mounting portion structure of this embodiment, as shown in FIG. 8, the inclined surface 18 a formed on the bottom surface 15 a of the insertion groove 15 is arranged in a V shape with a position corresponding to the distal end surface 3 b of the tube 3. It is.

  Therefore, according to this embodiment, the distal end surface 3b of the tube 3 is abutted against the inclined surface 18a on the inclined surface 18a arranged in a V shape, and the same operations and effects as those of the third embodiment are naturally obtained. In other words, since both side corners of the distal end surface 3b of the tube 3 can be brought into contact with the inclined surface 18a, the tube 3 can be stabilized when assembled.

  In this embodiment, the inclined surface 18a is arranged in a V shape. However, a portion corresponding to the V-shaped valley portion may be flat or arcuate.

(Second Modification of Third Embodiment)
FIG. 9 shows a modification of the third embodiment. The same components as those in the third embodiment are denoted by the same reference numerals and redundant description is omitted. FIG. 9 is an enlarged vertical section of the main part of the header tank. FIG.

  In the tube mounting portion structure of this embodiment, as shown in FIG. 9, the inclined surface 18a formed on the bottom surface 15a of the insertion groove 15 is formed as an arc surface.

  Therefore, according to this embodiment, the distal end surface 3b of the tube 3 is abutted against the inclined surface 18a against the inclined surface 18a formed on the circular arc surface, so that the same operation and effect as the third embodiment can be obtained. In addition, as in the first modified example, both side corners of the distal end surface 3b of the tube 3 can be abutted against the inclined surface 18a, so that the tube 3 can be stabilized when assembled.

(Third Modification of Third Embodiment)
FIG. 10 shows a modification of the third embodiment, and the same components as those in the third embodiment are denoted by the same reference numerals and redundant description is omitted. FIG. 10 is an enlarged vertical section of the main part of the header tank. FIG.

  In the tube mounting portion structure of this embodiment, as shown in FIG. 10, the gap forming means 18 is formed as a recess 18b formed in a portion where the bottom surface 15a corresponds to the distal end surface 3b of the tube 3 (Claim 6).

  The recess 18b passes through the boundary wall 11a and communicates with the cylindrical portions 12 and 12 on both sides of the header tank 2, and the width thereof is smaller than the width of the flat tube 3 in the short axis direction. Thus, the tube 3 is prevented from entering.

  Therefore, according to this embodiment, similarly to the inclined surface 18a of the above-described embodiment, the distal end surface 3b of the tube 3 is abutted against the bottom surface 15b of the insertion groove 15 while the distal end surface 3b of the tube 3 is brought into contact with the bottom surface 15b by the recess 18b. The blockage by 15a can be prevented.

  By the way, although the tube attachment part structure of the heat exchanger of this invention was demonstrated taking the example in the said 1st-3rd embodiment, in the range which does not deviate from the summary of this invention, it is not restricted to these embodiments, other implementations. Various forms can be taken.

1 is an overall perspective view of a heat exchanger showing a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the header tank along the line AA in FIG. 1. FIG. 3 is an enlarged longitudinal sectional view of a header tank taken along line BB in FIG. 2. It is a principal part expanded horizontal sectional view of the header tank which shows 2nd Embodiment of this invention. It is a principal part expanded vertical sectional view of the header tank which shows 2nd Embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view of the header tank which shows the 1st modification of 2nd Embodiment of this invention. It is a principal part expanded vertical sectional view of the header tank which shows 3rd Embodiment of this invention. It is a principal part expanded vertical sectional view of the header tank which shows the 1st modification of 3rd Embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view of the header tank which shows the 2nd modification of 3rd Embodiment of this invention. It is a principal part expanded vertical sectional view of the header tank which shows the 3rd modification of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Header tank 3 Tube 3a End of tube 3b End face of tube 10 Plate (outer member)
11 blocks (inner member)
14 Insertion hole 15 Insertion groove 15a Bottom surface 15b Bottom portion 16 Amplifying portion 18 Gap forming means 18a Inclined surface 18b Recessed portion

Claims (6)

A header tank (2) having a hollow interior;
The end (3a) inserted from the insertion hole (14) formed in the outer member (10) of the header tank (2) is fitted into the insertion groove (15) formed inside the inner member (11), A tube (3) brazed with the insertion hole (14),
A heat exchanger for flowing heat exchange fluid in the header tank (2) to the tube (3) and exchanging heat with other heat exchange fluid while flowing through the tube (3),
The insertion hole (14) is arranged so that the brazing material melted in the gap (δ2) between the insertion groove (15) and the tube (3) fitted in the insertion groove (15) does not exhibit capillary action. A tube mounting portion structure for a heat exchanger, wherein an amplification portion (16) having an inner width (W2) larger than the inner width (W1) of the heat exchanger is formed. The tube mounting portion structure for a heat exchanger according to claim 1, wherein the amplifying portion (16) is formed over the entire insertion groove (15). The tube mounting portion structure for a heat exchanger according to claim 1, wherein the amplification portion (16) is limited to the bottom portion (15b) of the insertion groove (15). The gap forming means (18) for securing a gap between the bottom surface (15a) of the insertion groove (15) and the distal end surface (3b) of the tube (3) is formed. The tube attachment part structure of the heat exchanger in any one. The heat exchange according to claim 4, wherein the gap forming means (18) is an inclined surface (18a) in which the bottom surface (15a) is inclined with respect to the distal end surface (3b) of the tube (3). Tube mounting part structure. The tube mounting portion structure for a heat exchanger according to claim 4, wherein the gap forming means (18) is a recess (18b) formed in a portion corresponding to the tip end surface (3b) of the tube (3). .

Images