JP2001041679A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the assembling labor and the manufacturing cost by modifying an anti-shift structure provided for two flat plates constituting a refrigerant conduction part. SOLUTION: Plate type refrigerant conduction parts 11, formed by laying two flat plates 13, 14 subjected to drawing in layer and incorporating a refrigerant channel, and cooling fins are placed alternately in layers. Each flat plate 13, 14 is provided with a refrigerant inlet 15 for introducing refrigerant into the refrigerant channel and a refrigerant outlet 16 for delivering refrigerant passed through the refrigerant channel. Refrigerant flowing through the refrigerant inlet 15 into the refrigerant conduction part 11 is passed through the refrigerant channel and discharged from the refrigerant outlet 16. In such a heat exchanger, the flat plate 14 is provided with protrusions 21 and the flat plate 13 is provided with recesses 22 being fitted with the protrusions 21 when the flat plates 13, 14 are laid in layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger constituting a vehicle air conditioner.

[0002]

2. Description of the Related Art FIG. 8 shows an example of the structure of a heat exchanger used as an evaporator in a vehicle air conditioner. The heat exchanger shown in the drawing is a so-called Dron cup type, which has become mainstream in recent years, and is bent into a wave shape with a plate-like refrigerant flow portion 3 in which substantially rectangular flat plates 1 and 2 that have been subjected to a drawing process are overlapped. The cooling fins 4 are alternately stacked.

[0003] Inside the refrigerant flow part 3, the outer peripheral part and the central part of the flat plates 1 and 2 are brazed to reciprocate from the refrigerant inlet 5 provided at the upper part to the lower part and to be aligned with the refrigerant inlet 5 at the upper part. A U-shaped refrigerant flow path R is formed to pass through a refrigerant outlet 6 provided in the air conditioner.

[0004] In this heat exchanger, the refrigerant is distributed to each refrigerant distribution part 3 at the refrigerant inlet 5, is evaporated and vaporized in the course of flowing through the refrigerant flow path R, merges again at the refrigerant outlet 6 and flows out of the heat exchanger. It is supposed to.

[0005]

However, the following problems have been pointed out in the heat exchanger having the above structure. The refrigerant flow part 3 is formed by superimposing two drawn flat plates 1 and 2 and brazing after providing a refrigerant flow part R therein. If this occurs, the airtightness of the refrigerant flow path R is not ensured, or a sufficient pressure resistance cannot be obtained, causing a problem. Therefore, conventionally, a claw is provided on one of the flat plates as a measure for preventing the displacement of the flat plates 1 and 2, and when the other flat plate is overlapped, the claw is swaged to fix both.

However, in the conventional measures for preventing displacement,
There is a problem that a step of caulking the claws is required, which increases the number of assembling steps, and that an extra material is required for the claws, resulting in an increase in manufacturing cost when mass production is assumed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and aims at reducing the number of assembling man-hours and the manufacturing cost by revising a structure for preventing displacement provided on two flat plates constituting a refrigerant flow portion. It is an object.

[0008]

As means for solving the above-mentioned problems, a heat exchanger having the following structure is employed. That is, in the heat exchanger according to claim 1, two drawn flat plates are superimposed, and a plate-shaped refrigerant flow portion having a refrigerant flow path provided therein and cooling fins are alternately laminated. The two flat plates are formed with a refrigerant inlet for introducing a refrigerant into the refrigerant flow passage, and a refrigerant outlet for leading a refrigerant having passed through the refrigerant flow passage is formed. From the refrigerant outlet after flowing from the refrigerant outlet after flowing into the refrigerant flow portion from the refrigerant flow path, wherein any one of the two flat plates as an alignment portion of the two flat plates And a concave portion formed on the other of the two flat plates so as to fit with the protruding portion in a state where the two flat plates are overlapped with each other.

In this heat exchanger, two flat plates are overlapped, and the projections formed on one flat plate and the concave portions formed on the other flat plate are fitted to each other to align the flat plates. Is possible. If this alignment portion is employed, the step of caulking the nail as in the related art is omitted, and the material for the nail is not required.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the positioning portion has at least two positions.
It is characterized by being provided in more than one place.

In this heat exchanger, the positioning accuracy is improved by providing two or more positioning portions.

According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect, the protrusions and the recesses are formed on the two flat plates when drawing the flat plates. It is characterized by being constituted by irregularities.

In this heat exchanger, since the projections and the recesses are both formed when the two flat plates are subjected to the drawing process, not only does not require any extra material but also an extra step in the process. Is unnecessary, and no extra manufacturing cost is required even if the alignment portion is provided.

[0014] The heat exchanger according to the fourth aspect is the first or second aspect.
Or in the heat exchanger according to 3, wherein the refrigerant circulating section includes:
At least one of the two flat plates is depressed from the outside to form a swelling portion protruding toward the refrigerant flow path, and the top of the swelling portion is brought into contact with the other, so that the swelling portion in the flow direction of the refrigerant. It is characterized in that a plurality of elliptical or elliptical columnar parts having a longer diameter are provided between the two flat plates.

[0015] In this heat exchanger, the refrigerant collides with the columnar part in the course of flowing through the refrigerant flow path, and the flow of the refrigerant is disturbed. The turbulence effect improves the heat transfer coefficient. In addition, by joining the bulging portions to form a columnar portion, the joining strength of the two flat plates forming the coolant channel is increased.

According to a fifth aspect of the present invention, there is provided the heat exchanger according to the fourth aspect, wherein the columnar portions are partially obliquely adjacent to the flowing direction of the refrigerant in the flowing direction. It is characterized by being arranged so as to overlap.

In this heat exchanger, the front end of the column located downstream from the rear end of the column located upstream of the flow between the column adjoining obliquely to the refrigerant flow direction. Is located upstream, the local heat transfer coefficient, which tends to decrease at the rear end of the column located on the upstream side, is compensated for by the front end of the column located on the downstream side.

According to a sixth aspect of the present invention, there is provided a heat exchanger, wherein two drawn flat plates are overlapped with each other, and a plate-shaped refrigerant flow portion having a refrigerant flow path provided therein and cooling fins are alternately laminated. The two flat plates are formed with a refrigerant inlet for introducing a refrigerant into the refrigerant channel and a refrigerant outlet for leading a refrigerant that has passed through the refrigerant channel, and the refrigerant is formed of the refrigerant. A heat exchanger that flows into the refrigerant flow section from an inlet, flows through the refrigerant flow path, and is then discharged from the refrigerant outlet, and includes two flat plates as a positioning unit that positions the two flat plates. And a hole formed in the other of the two flat plates so that the two flat plates can be fitted to the protruding portion in a state where the two flat plates are overlapped.

In this heat exchanger, the two flat plates can be overlapped and aligned by fitting the projection formed on one of the two flat plates with the hole formed on the other. It is. If this alignment portion is employed, the step of caulking the nail as in the related art is omitted, and the material for the nail is not required.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a heat exchanger according to the present invention will be described with reference to FIGS. The heat exchanger shown in FIG. 1 is configured by alternately stacking plate-shaped refrigerant circulation portions 11 and corrugated cooling fins 12.

As shown in FIG. 2, the refrigerant flow portion 11 is formed by laminating substantially rectangular flat plates 13 and 14 which have been drawn and brazing the outer peripheral portion and the central portion. 15 and a refrigerant outlet 16 are provided side by side. Inside the refrigerant flow portion 11, the outer peripheral portions and the central portions of the flat plates 13 and 14 are brazed to advance downward from the refrigerant inlet 15 provided at the upper portion, turn back at the lower portion, and pass through the refrigerant outlet 16. A refrigerant passage R having a U-shape is formed.

A plurality of dimples 1 are formed in the refrigerant flow section 11 by flattening the flat plates 13 and 14 forming the refrigerant flow path R from the outside.
7 are formed, and a plurality of bulging portions 18 are formed in the refrigerant flow path R by these dimples 17. As shown in FIG. 3, these bulging portions 18 have an elliptical shape whose major axis is the flow direction of the refrigerant when viewed in a plan view, and the top portions 18 a are further brazed by opposing bulging portions 18.
It is provided between the flat plates 13 and 14 to form a columnar portion 19 having an elliptical cross-sectional shape. The shape of the columnar body 19 is not limited to an ellipse, but may be an ellipse.

As shown in FIG. 4, each of the bulging portions 18 is arranged in a staggered manner such that the bulging portions 18 which are obliquely adjacent to the flow direction of the refrigerant partially overlap each other in the flow direction. The columnar portion 19 is also arranged according to this.

The refrigerant inlet 15 comprises openings 13a and 14a formed in the flat plates 13 and 14, and the refrigerant inlet 15 provided in each of the refrigerant flow portions 11 projects without sandwiching the cooling fins 12, as shown in FIG. Combined and continuous entrance space S
forming in. Similarly, the refrigerant outlet 16 is connected to the flat plates 13, 1
4, the refrigerant outlets 16 provided in each of the refrigerant flow portions 11 are abutted without sandwiching the cooling fins 12 to form a continuous outlet side space Sout as shown in FIG. are doing.

In the heat exchanger having the above-described structure, the refrigerant is distributed to the respective refrigerant distribution sections 11 in the process of traveling in the direction of the arrow in the inlet side space Sin, and is evaporated and vaporized in the process of flowing through the refrigerant flow path R. In the outlet side space Sout, they merge again and flow out.

In the process in which the refrigerant flows through the refrigerant flow path R, the refrigerant collides with the columnar portions 19 provided in the refrigerant flow path R to cause a disturbance in the flow of the refrigerant, and the turbulence effect improves the heat transfer coefficient. . Moreover, between the columnar portions 19 obliquely adjacent to the flow direction of the refrigerant, the columnar portions 1 located on the upstream side of the flow are arranged.
Since the front end of the columnar portion 19 located downstream of the rear end of the column 9 is located on the upstream side, the local heat transfer coefficient, which tends to decrease at the rear end of the columnar portion 19 located on the upstream side, is reduced to the downstream side. Supplemented by the front end of the columnar portion 19 located,
The heat transfer coefficient is improved as a whole.

Further, since the columnar portions 19 are regularly arranged along the flow direction of the refrigerant, and the joints between the top portions 18a are widely secured, the refrigerant flow portion 11 has any cross section in the flow direction of the refrigerant. The two flat plates 13 and 14 are bonded to each other by the bulging portions 18 to increase the bonding strength. Thereby, even if the thickness of the flat plates 13 and 14 is thin, sufficient pressure resistance can be obtained in the refrigerant flow portion 11.

By the way, the refrigerant flow section 11 is formed by superposing and brazing substantially rectangular flat plates 13 and 14.
When actually manufacturing the heat exchanger, instead of laminating a plurality of brazed refrigerant flowing portions 11 and brazing again to join them, the flat plates 13, 14, The cooling fins 12 are sequentially arranged and stacked, and other components are assembled, and then the heating fin (not shown) is assembled.
And heat to braze each part.

What is important is the positioning of the flat plates 13 and 14, and the flat plates 13 and 14 are provided with positioning portions 20 at a plurality of spaced locations on the outer peripheral portion to be brazed as shown in FIG. Have been. As shown in FIG. 7, the positioning unit 20 includes a projection 21 formed on the flat plate 14 and a flat plate 1.
A recess 22 is formed in the flat plate 13 so as to be fitted to the projection 21 in a state in which the projections 3 and 14 are overlapped. Both the projection 21 and the recess 22 are formed when the flat plates 13 and 14 are subjected to drawing.

In this heat exchanger, the flat plates 13, 14
Are superimposed on each other, and the projections 21 and the recesses 22 are fitted to each other so that the flat plates 13 and 14 can be aligned with each other. If this positioning unit 20 is employed, the step of caulking the nail as in the related art is omitted, and the material for the nail is not required, so that the number of assembling steps and the manufacturing cost can be reduced.

The positioning unit 20 includes flat plates 13 and 14.
Since a plurality of peripheral portions are provided on the outer peripheral portion to be brazed, the accuracy of positioning is improved, and the manufacturing error of the heat exchanger can be suppressed to a small value.

Further, since the projections 21 and the recesses 22 are both formed when the flat plates 13 and 14 are drawn, not only no extra material is required but also no extra steps are required in the processing. Even if the alignment unit 20 is provided, no extra manufacturing cost is required.

By the way, in this embodiment, the protrusion 2
Although 1 is formed on the flat plate 14 and the concave portion 22 is formed on the flat plate 13, there is no problem if the projection 21 is formed on the flat plate 13 and the concave portion 22 is formed on the flat plate 14. Alternatively, both the projection 21 and the recess 22 may be provided on the flat plate 13, and the flat plates 13 and 14 may be overlapped and fitted together.

Further, in the present embodiment, the positioning portion 20 is constituted by combining the protrusion 21 and the recess 22. However, it goes without saying that the same effect can be obtained even if the recess 22 is formed as a hole. If the holes are formed when the flat plate 14 is die-cut, no extra manufacturing cost is required.

[0035]

As described above, according to the heat exchanger according to the first aspect of the present invention, two flat plates are overlapped with each other, and the protrusion formed on one flat plate and the other flat plate are formed. The flat plates can be aligned with each other by fitting the recessed portions. If this alignment portion is employed, the step of caulking the nail as in the related art is omitted and the material for the nail is not required, so that the number of assembling steps and the manufacturing cost can be reduced.

According to the heat exchanger of the second aspect, since the positioning accuracy is improved by providing the positioning portion at two or more locations, the manufacturing error of the heat exchanger can be reduced.

According to the heat exchanger of the third aspect, since the projections and the recesses are both formed when the two flat plates are drawn, not only does not require any extra material. No extra steps are required for the processing, and even if the alignment portion is provided, no extra production cost is required. For this reason, it is possible to reduce the manufacturing cost of the refrigerant distribution unit as compared with the related art.

According to the heat exchanger of the fourth aspect, since the refrigerant collides with the columnar part in the course of flowing through the refrigerant flow path, the flow of the refrigerant is disturbed, and the turbulence effect improves the heat transfer coefficient. In addition, the heat exchange capacity of the heat exchanger can be improved.
In addition, the joint strength between the two flat plates forming the coolant flow channel is increased by joining the bulging portions to form the columnar portion, so that the pressure resistance of the coolant circulation portion can be increased.

According to the heat exchanger of the fifth aspect, between the columnar portions that are obliquely adjacent to the flow direction of the refrigerant, the columnar portions are located downstream of the rear end of the columnar portion located on the upstream side of the flow. The front end of the columnar portion is arranged on the upstream side, and the local heat transfer coefficient, which tends to decrease at the rear end of the columnar portion located on the upstream side, is supplemented by the front end of the columnar portion located on the downstream side. The heat transfer coefficient can be improved as a whole.

According to the heat exchanger of the sixth aspect, the two flat plates are overlapped with each other, and the projections formed on one flat plate and the holes formed on the other flat plate are fitted to each other so that the flat plates are joined to each other. Can be aligned. If this alignment portion is employed, the step of caulking the nail as in the related art is omitted and the material for the nail is not required, so that the number of assembling steps and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a heat exchanger according to the present invention.

FIG. 2 is an exploded perspective view showing a refrigerant flow section constituting the heat exchanger of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of the refrigerant flow section as viewed from the side.

FIG. 5 is a cross-sectional view showing an inlet side space and a refrigerant flow path connected thereto.

FIG. 6 is a cross-sectional view showing an outlet side space and a refrigerant flow path connected thereto.

FIG. 7 is a state explanatory view showing a positioning operation of two flat plates by a positioning unit.

FIG. 8 is a perspective view showing an example of a conventional evaporator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Refrigerant distribution part 12 Cooling fin 13, 14 Flat plate 13a, 14a Opening 15 Refrigerant inlet 16 Refrigerant outlet 17 Dimple 18 Swelling part 19 Columnar part 20 Positioning part 21 Projection part 22 Recess R Refrigerant flow path

Claims (6)

[Claims] 1. A two-plate drawing machine comprising: two drawn flat plates which are superimposed on each other and a cooling fin and a plate-shaped cooling medium circulating portion provided with a cooling medium passage therein are alternately stacked; The flat plate has a refrigerant inlet for introducing a refrigerant into the refrigerant flow passage, and a refrigerant outlet for guiding the refrigerant passing through the refrigerant flow passage. The refrigerant flows from the refrigerant inlet to the refrigerant distribution portion. And
A heat exchanger that is discharged from the refrigerant outlet after flowing through the refrigerant flow path, wherein a projection formed on one of the two flat plates as an alignment portion for the two flat plates; A heat exchanger, comprising: a recess formed in the other of the two flat plates so as to fit with the projection in a state where the two flat plates are overlapped. 2. The heat exchanger according to claim 1, wherein the positioning unit is provided at at least two places. 3. The heat exchange according to claim 1, wherein the projections and the recesses are formed by irregularities formed on the two flat plates when drawing the flat plates. vessel. 4. A swelling portion that protrudes toward the coolant flow channel by depressing at least one of the two flat plates from the outside in the coolant circulating portion, and a top portion of the swelling portion is connected to the other side. A plurality of elliptical or elliptical columnar portions having a major axis directed in the flow direction of the refrigerant by being brought into contact with the flat plate are provided between the two flat plates. The heat exchanger as described. 5. The columnar portion, wherein ones obliquely adjacent to a flow direction of the refrigerant are arranged so as to partially overlap each other in the flow direction.
The heat exchanger as described. 6. A plate-shaped refrigerant flow section having a refrigerant flow path provided therein and cooling fins laminated alternately on two drawn flat plates, and said two sheets are formed. The flat plate has a refrigerant inlet for introducing a refrigerant into the refrigerant flow passage, and a refrigerant outlet for guiding the refrigerant passing through the refrigerant flow passage. The refrigerant flows from the refrigerant inlet to the refrigerant distribution portion. And
A heat exchanger that is discharged from the refrigerant outlet after flowing through the refrigerant flow path, as a positioning unit that positions the two flat plates,
A projection formed on one of the two flat plates; and a hole formed on the other of the two flat plates so as to fit with the projection in a state where the two flat plates are overlapped. Characterized heat exchanger.