JPH0752637A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide a heat exchanger for preventing air leakage so as to prevent deterioration of cooling ability regardless of the grade of scattering of the heat exchanger whose width direction baking size after it is compressed and integrally soldered is large. CONSTITUTION:There is a case in which an air path is formed and a recessed part 22 is formed on both inner wall surfaces. A heat exchanger in which a tube and a fin are arranged alternatively and plates 19 being provided on the both side faces in the direction the tube and the fin are arranged alternatively on which a packing joined from an upper end part to a lower end part of the heat exchanger in a longitudinal direction of the tube is stuck are provided. The heat exchanger is stored in the case by making the recessed part 22 and the plate 19 on which the packing is stuck come closely into contact. Air being sent is isolated at the plate 19 on which the packing is stuck and the air will not flow between the side plate and the case. Thereby, deterioration of cooling ability due to air leakage can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner used in a vehicle or the like, and more particularly to a structure for preventing air leakage of a heat exchanger.

[0002]

2. Description of the Related Art A resin case 21 for covering a heat exchanger 7 is
As shown in FIG. 9, it is shaped according to the shape of the heat exchange 7. On the side plate of the heat exchanger 7 shown in FIG. 7,
The ribs 28 are provided in the direction orthogonal to the air flow direction, and the packing 25 is attached to the inner surface side of the resin case 21. Further, as shown in FIG. 8, a packing may be further attached to the outer surface of the rib 28 of the heat exchanger 7 to bring the heat exchanger and the resin case into close contact with each other to prevent air leakage. .

[0003]

However, the heat exchanger is
Since the tubes and the fins are overlapped and integrally brazed in the process, there is a large variation in the dimension in the width direction after the integral brazing, and even if the packing is applied as described above, the width of the heat exchanger becomes smaller. There is a problem that the sealing performance is deteriorated and the cooling capacity is deteriorated due to air leakage.

Therefore, an object of the present invention is to provide an air conditioner capable of preventing the occurrence of air leakage between the case and the heat exchanger even if there are variations in the widthwise dimension after the integrated brazing. To do.

[0005]

In order to achieve the above-mentioned object, the present invention has the above-mentioned tube and fins arranged on both sides of the heat exchanger in the direction in which they are alternately arranged, in the same direction as the longitudinal direction of the tube. A technical means is adopted in which the heat exchanger is housed in the case in such a manner that a convex portion is erected from one end portion to the other end portion of both side surfaces and the convex portion and the concave portion of the case are brought into close contact with each other.

[0006]

According to the above-described structure of the present invention, one end to the other end of both side surfaces of the heat exchanger in the direction in which the tubes and the fins are alternately arranged are provided in the same direction as the longitudinal direction of the tube. The convex portion which is erected up to the portion comes into close contact with the concave portion formed in the case. Therefore, even if there is a variation in the widthwise dimension of the heat exchanger tube and fins after brazing, regardless of the variation, the air sent to the heat exchanger stands upright. The heat exchanger and the case can be sealed by closely contacting the recess formed in the case with the case.

[0007]

According to the configuration of the present invention described above, the heat exchanger is provided on both side surfaces of the heat exchanger in the direction in which the tubes and the fins are alternately arranged from one end of the both side surfaces in the same direction as the longitudinal direction of the tube. The convex portion standing up to the other end is in close contact with the concave portion formed in the case. Therefore, even if there is a variation in the widthwise dimension of the heat exchanger tube and fins after brazing, regardless of the variation, the air sent to the heat exchanger and the convex portion on which the air is erected are erected. The heat exchanger and the case can be sealed by closely contacting the recess formed in the case. As a result, it is possible to prevent air leakage and prevent the cooling capacity from decreasing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the basic layout of the air conditioner in the first embodiment. This air conditioner is provided with a case 1 forming an air passage, and an inside air introduction port 2 and an outside air introduction port 3 are formed at the most upstream side of the case 1. An inside / outside air switching damper 4 for selectively opening / closing the inside air inlet 2 and the outside air inlet 3 is provided. The blower motor 5 and the blower fan 6 each having a variable rotation capacity are connected to each other, and the blower fan 6 changes its blowing capacity in accordance with the rotation speed of the blower motor 5. Next, a laminated heat exchanger 7 forming an engine of a known refrigeration cycle and an air mix damper 8 for opening / closing and adjusting the amount of air sent to the heater core 10 are provided. And the heater core 10
A bypass passage 9 serving as an air passage that does not pass through the air mix damper 8 is formed. Defroster door 1 that opens and closes the ventilation port that blows air inside the windshield
1, a vent door 12 that opens and closes a ventilation port that blows air to the upper body of the boarding vehicle, and a floor door 13 that opens and closes a ventilation port that blows air to the lower body of the boarding vehicle.

Actually, while the air conditioner is operating, the inside / outside air switching damper 4 opens and closes the range of the arrow as shown in FIG. 1 to select the inside air inlet 2 or the outside air inlet 3. By applying a voltage to the blower motor 5 from the selected inlet, the blower fan 6 rotates, and the selected inside air or outside air is sent to the laminated heat exchanger 7. And in the laminated heat exchanger 7,
The blown air is cooled as it passes through the fins cooled by the refrigerant. The cooled air is opened and closed by the air mix damper 8 in the range indicated by the arrow, so that the heater core 10 is cooled.
The amount of air sent to the heater is adjusted, and the air warmed by the heater core 10 and the cold air sent by the bypass passage 9 are mixed to perform air conditioning. The air-conditioned air is used in the defroster 11, the vent door 12, and the floor door 13.
The air is blown into the car from the outlet.

FIG. 2 shows a perspective view of the laminated heat exchanger 7, and FIG. 3 shows a front view of the laminated heat exchanger 7. Stacked heat exchanger 7
Is a side plate 14 made of aluminum alloy with a thickness of 0.8 mm.
23 flat tubes 15 and 24 corrugated fins 16 made of aluminum, which are formed by stacking two aluminum alloy plates press-formed on the
After that, the side plate 14 is overlaid on the tube 1
It is formed by being loaded into the furnace in a compressed state in which the space between 5 and the fins 16 is packed, and then thermally coupled by integral brazing. The tank 17 is connected to a plurality of tubes 15 and distributes the refrigerant of the refrigeration cycle supplied from an expansion valve (not shown) evenly.

Next, a plate 19 made of the same aluminum alloy as the side plate 14 is provided on the windward side of the side plate 14 in the direction orthogonal to the air flow direction, from the upper end portion B to the lower end portion C (FIG. 2) of the laminated heat exchanger. Refer to) and in the same direction as the longitudinal direction of the tube. The plate 19 has a thickness (width indicated by a in FIG. 2) of 0.8 mm. 2mm thickness
The plate-shaped polyethylene packing 20 (heat insulating material) is bent and attached to the entire surface except the upper and lower end surfaces of the plate 19 as shown in FIG. Further, the case 21 of FIG. 5 is formed of a resin material such as polypropylene, and properly stores and holds the laminated heat exchanger 7 of the refrigeration cycle. A recess 22 (see FIG. 5) is provided on the windward side of the case 21. Thus, in order to improve the sealing property, the laminated heat exchanger 7 provided with the plate 19 to which the packing 20 is attached and the case 21 provided with the concave portion 22 are inserted and combined. Also,
A packing 18 is attached to the tank 17 to prevent air leakage and to insulate the cooled refrigerant.

For example, assuming that the width dimension between both side plates 14 of the laminated heat exchanger 7 before the compression and integrated brazing steps is 300 mm, both sides of the laminated heat exchanger 14 after the compression and integrated brazing steps. The width between the side plates (width indicated by symbol A in Fig. 3) is 7mm at maximum in the process.
There is a variation of (2.3%). Up to now, the brazing surfaces of the plates forming the flat tubes 15 are brazed well, so that when the compression is performed, the corrugated fins 16 of the respective layers and the flat tubes 15 are stacked so that the laminated heat exchange after compression is performed. The width of the container 7 in the compression direction varies. Further, there is a difference in shrinkage in the same direction during the process of integral brazing, which also causes variation. Therefore, when the laminated heat exchanger 7 and the case 21 after compression and integrated brazing are assembled, the laminated heat exchanger 7 and the case 21 are assembled.
Even if a polyethylene packing or the like is sandwiched between the side plate 14 and the case 21, a gap is created between the side plate 14 and the case 21, which causes air leakage and lowers the cooling capacity. In order to deal with this, if the width of the plate 19 in the direction orthogonal to the air flow direction (width indicated by reference character b in FIG. 3) is 1/2 of the maximum variation, any variation can be accommodated. That is, it is 3.5 mm in this example. In addition, the width of the plate 19 to which the packing 20 is attached in the air flow direction (the width indicated by the symbol c in FIG. 4) is 4.8 mm. The width of the recess 22 in the direction orthogonal to the air flow direction (the width indicated by the symbol d in FIG. 5) is also 3.5 mm.
Becomes As a result, the inner wall width of the recess 22 (reference numeral e in FIG. 5)
Is smaller than the width c of the plate 19 to which the packing 20 is attached in the air flow direction, and press fit when the case 21 and the plate 19 to which the packing 20 is attached are press-fitted to form the plate 19. The recesses 22 are brought into close contact with each other and the sealing property is improved. Further, it is possible to abolish the entire circumference packing 23 (see FIG. 8) and the packing 25 and the like (see FIG. 9) on the inner surface of the case 21, which have been conventionally performed to prevent air leakage.
Thus, by providing the plate 19 with the packing 20 attached thereto and the concave portion 22, the air sent from the blower fan 6 stuck the packing 20 regardless of the variation in the width dimension A between the side plates 14. It is blocked by the plate 19 and air does not flow between the side plate 14 and the case 21. As a result, it is possible to prevent a reduction in the cooling capacity due to air leakage.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be explained. FIG. 10 is a top view showing the cooler unit in the second embodiment. In the second embodiment, the installation position of the recess 22 of the first embodiment is changed so that the recess 22 is replaced by the case 2.
1 does not project to the outer wall surface of the case 21 and is recessed on the inner wall surface of the case 21.
By installing the, the mountability when mounted in the engine room is improved. Similar to the above embodiment, the plate 19 is provided on the most windward side of the side plate 14 in the direction orthogonal to the air flow direction. Then, the packing 20 is attached to the plate 19. Also, the side plate 14
The ribs 26 (strike-out) are formed so as to project in a direction orthogonal to the air flow direction. At the same time, the concave portion 22 is formed by installing the convex portion 27a, the convex portion 27b, and the convex portion 27c on the inner wall surface of the case 21.

As described above, the air blown by the blower fan 4 is supplied to the packing 2 by pressing and combining the recess 22 and the plate 19 to which the packing 20 is attached.
0 is blocked by the plate 19 attached, and the air does not flow between the side plate 14 and the case 21. Further, by combining the ribs 26 between the convex portions 27b and the convex portions 27c shown in FIG. 11, the case 21 and the laminated heat exchanger 7 are more closely fixed to each other. As a result, even if there is a variation in the width between the side plates 14 in the process, it is possible to prevent the cooling capacity from being deteriorated due to air leakage. It also improves the ease of installation in the engine room.

Next, a third embodiment of the present invention will be described. The plate 19 and the side plate 14 are integrally formed, and the convex portions are provided in the direction orthogonal to the air flow direction. As a result, the step of attaching the plate 19 can be omitted, and by making the concave portion 22 and the convex portion formed by integrally forming the plate 19 on the side plate 22 in close contact with each other, it is possible to prevent the cooling capacity from decreasing due to air leakage.

Next, a fourth embodiment of the present invention will be described. Although it is almost the same as each of the above-mentioned embodiments, the width e of the recess of the case 21 is not required even if the packing 20 is attached to the plate 19.
And the side plates 14 have the same width. Then, by bringing the plate 19 into close contact with the concave portion of the case 21, it is possible to prevent a decrease in cooling capacity due to air leakage. In each of the above embodiments, both side plates 14 of the laminated heat exchanger 7 are
The width between them was 300 mm, and there was a maximum dimensional variation of 7 mm. However, if the width between both side plates 14 is large, the dimensional variation is large, and if the width between both side plates 14 is small, the dimensional variation is small. Therefore, the width d of the plate 19 in the direction orthogonal to the air flow direction has a value corresponding to each.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a basic layout of an air conditioner in a first embodiment of the present invention.

FIG. 2 is a perspective view of the laminated heat exchanger in the first embodiment.

FIG. 3 is a side view of the laminated heat exchanger in the first embodiment.

FIG. 4 is a perspective view of the laminated heat exchanger after the packing is attached in the first embodiment.

FIG. 5 is a top view of the laminated heat exchanger in the first embodiment.

FIG. 6 is a cross-sectional view of the laminated heat exchanger in the first embodiment.

FIG. 7 is a perspective view of a conventional laminated heat exchanger.

FIG. 8 is a perspective view of a conventional laminated heat exchanger provided with packing around the entire circumference.

FIG. 9 is a top view of a conventional laminated heat exchanger.

FIG. 10 is a top view of the laminated heat exchanger according to the second embodiment of the present invention.

11 is an enlarged view of D in FIG.

[Explanation of symbols]

 7 Laminated heat exchanger 15 Tube 16 Fin 19 Plate (projection) 22 Recess

Claims (1)

[Claims] 1. A case in which an air passage is formed and recesses are formed on both inner wall surfaces, a heat exchanger in which tubes and fins are arranged alternately in the case, and the tubes and fins alternate. On both side surfaces of the heat exchanger in the direction aligned with, the convex portion of the heat exchanger provided with a convex portion standing from one end to the other end of the both side surfaces in the same direction as the longitudinal direction of the tube. When. An air conditioner characterized by being brought into close contact with the recess of the case.