JPH0754237B2 - Air conditioner condenser - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser for an air conditioner, and is particularly effective when used for an air conditioner for an automobile. [0002] Conventionally, in this type of capacitor,
As disclosed in U.S. Pat. No. 4,615,385, a pair of left and right tanks made of pipes having a circular cross section are provided, a plurality of heat transfer tubes are arranged in the tanks, and the heat transfer tubes are thermally coupled to the plurality of heat transfer tubes. Corrugated fins were installed to do so. SUMMARY OF THE INVENTION It is an object of the present invention to increase the pressure resistance of the tank in such a type of capacitor. That is, in a condenser for an air conditioner, heat exchange of the high-temperature and high-pressure refrigerant discharged from the compressor is performed, so that 50 kg / cm ² is contained in the heat transfer tube or tank.
High pressure resistance up to this level is required. Here, in order to increase the pressure resistance, it is required to thicken the peripheral wall of the tank, but this increases the weight of the entire capacitor, and a capacitor used in an air conditioner for automobiles is not suitable. Therefore, it is desirable to make the wall of the tank as thin as possible. In this way, when the wall thickness of the tank portion is made as thin as possible so long as heat resistance strength is maintained, good action can be maintained during normal operation, but foreign matter or the like from the outside In the case of a collision, there is a risk of damage to the tank due to the scratches and the like that accompany the collision. According to the study by the present inventor, in the conventional condenser as disclosed in the above-mentioned US Pat. No. 4,615,385, the tank is located further outward than the fins, and therefore, the upper side or the upper side. When a foreign object collides from below or drops the condenser, it collides with the tank before hitting the outermost fin. On the other hand, the object of the present invention is to allow the outermost fin to act as a bumper so that the fin protects the tank portion. To achieve the above object, in the present invention, the fins are arranged between the plurality of flat tubes and further outside the flat tubes located at the outermost position. Then, the outermost fin is formed so as to extend further outward than the end portion of the tank. With the above construction, in the present invention, when the flat tubes are arranged so as to extend horizontally in the left-right direction, the outermost fins project further upward and downward from the end of the tank. It will be. Therefore, even if foreign matter falls from above the condenser, the foreign matter does not hit the fins first and collide directly with the tank. Conversely, when the condenser is dropped, the lowermost fin collides first. Therefore, the tank does not directly collide. Here, the fins are an important component for heat transfer, but the high-pressure refrigerant does not flow inside the fins, so even if the fins are damaged to some extent, the compressive strength of the capacitor will not be reduced. On the other hand, since the tank holds high-pressure refrigerant inside, if the tank is molded thinly and is damaged by collision etc., it may cause a fatal defect in the capacitor. Absent. As described above, in the present invention, since the fins that are not directly related to the pressure resistance against the internal refrigerant are used as bumpers to protect the tank holding the high pressure refrigerant, the thickness of the tank is reduced. Even in such a state, the pressure resistance can be reliably maintained. An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an example in which the present invention is applied to a capacitor used in a vehicle air conditioner. , This condenser is installed horizontally in parallel between the pair of tanks 10 and 10 (only the left side tank is shown in each figure) standing upright on the left and right in the engine room of the vehicle. , 20 and the fins 30 arranged in parallel to each of the heat transfer tubes 20. The left side tank 10 has a plurality of circular metal pipes P1, P2, ...
n, each of these metal pipes P1, P2, ...
., Pn-1 and Pn are made of aluminum alloy, and as shown in FIGS. 1 and 2, are laminated and fixed in the vertical direction with their respective axial directions being horizontal. The metal pipe P2 is attached to the circular opening P1a formed in the upper part of the peripheral wall of the metal pipe P1.
A burring hole processing portion P2a formed in the lower portion of the peripheral wall is fitted and communicates with the metal pipe P1. The metal pipe P2 has a longer axial length than each of the metal pipes P1, P3, ..., Pn-2, Pn having the same axial length, and heat exchange is performed at the tip of the metallic pipe P2. A joint member 40 required for inflow of fluid is coaxially attached. The metal pipe P3 is fitted into a circular opening P2b formed in the upper part of the peripheral wall of the metal pipe P2 at a burring hole processing part P3a formed in the lower part of the peripheral wall thereof so as to communicate with the metal pipe P2. The metal pipe P4 is welded to the upper part of the peripheral wall of the metal pipe P3 at the lower part of the peripheral wall. The metal pipe Pn-3 is fitted into a circular opening Pn-4a formed in the upper part of the peripheral wall of the metal pipe Pn-4 at a burring hole processing part Pn-3a formed in the lower part of the peripheral wall of the metal pipe Pn-3. -4 communicates with this metal pipe Pn-3
The lower part of the peripheral wall of the metal pipe Pn-2 is welded to the upper part of the peripheral wall. The metal pipe Pn-1 has the same axial length as the metal pipe P2, and the joint member 50 necessary for the outflow of the heat exchange fluid is provided at the tip of the metal pipe Pn-1.
Are mounted coaxially. Also, the metal pipe Pn-1
Is a burring hole Pn-1a formed in the lower part of the peripheral wall.
At this time, the metal pipe Pn-2 is fitted to the metal pipe Pn-2.
The metal pipe Pn is connected to the circular opening Pn-1b which is in communication with the inside of the metal pipe 2 and is formed in the upper part of the peripheral wall of the metal pipe Pn-1.
A burring hole processing portion Pna formed in the lower portion of the peripheral wall is fitted and communicates with the metal pipe Pn-1. The metal pipes P4 to Pn-4 are also fitted, communicated or welded in substantially the same manner as described above. However,
The number of sets of mutually communicating metal pipes in each of the metal pipes P1 to Pn is determined by the use and size of the capacitor. Further, both end openings of the metal pipes P1, P3 to Pn-2, Pn are sealed by the lid pair 11, respectively, and one end openings of the metal pipes P2, Pn-1 are also sealed by the lid pair 11, respectively. . In addition, each metal pipe P2, Pn-
The right side tank 10 has substantially the same configuration as the left side tank 10 except for the metal pipes corresponding to 1. The plurality of heat transfer tubes 20-20 are shown in FIGS.
As shown in FIG. 3, each of the heat transfer tubes 20 to 20 is assembled between the two tanks 10 and 10 with their respective axial directions horizontal, and the left end openings 21 to 21 of the heat transfer tubes 20 to 20 are the left end openings. Each of the metal pipes P1 of the left tank 10 facing the
P2, P3, ..., Pn-1 and Pn, respectively, elongated holes P11, P21, P3 formed in the inner peripheral wall of the Pn in the axial direction, respectively.
1, ..., Pn-11, Pn1 are respectively fitted and opened in the respective metal pipes P1, P2, P3, ..., Pn-1, Pn. On the other hand, the right end opening (not shown) of each heat transfer tube 20 to 20 is an elongated hole formed in the inner peripheral wall of each metal pipe of the right tank 10 facing the respective right end openings in the axial direction. The metal pipes are fitted in the respective portions and opened in the respective metal pipes. In addition, the plurality of fins 30
The fins 30 located at the lowermost position of the heat transfer tubes 20 to 30 are brazed to the lower surface of the heat transfer tube 20 located at the lowermost position, and the fins 30 located at the lowermost position of the heat transfer tube 20 located at the uppermost position. It is brazed to the upper surface, and the remaining fins 30 to 30 are brazed between the heat transfer tubes 20 to 20. In this embodiment constructed as described above, the axial directions of the openings at both ends of the heat transfer tubes 20 to 20 coincide with the axial directions of the inner peripheral wall portions of the metal pipes of both tanks 10 and 10, respectively. Therefore, the diameter of each metal pipe can be reduced. Therefore, it is possible to increase the pressure resistance of each tank 10 while reducing the wall thickness of each metal pipe, and to reduce the weight of each tank 10. Further, since both joint members 40, 50 can be attached to both metal pipes P2, Pn-1 in various directions thereof, each joint member 40, 50
Installation work of 50 becomes easy. Further, since the longitudinal direction of each elongated hole portion formed in the inner peripheral wall portion of each metal pipe coincides with the axial direction of each inner peripheral wall portion, the work of drilling each elongated hole portion. Facilitates productivity and promotes productivity. In addition, since the axial length of each metal pipe is short and the axial direction of each metal pipe matches the longitudinal direction of each elongated hole portion, each end face of each metal pipe has high flatness with high accuracy. While maintaining
It can be easily processed. In addition, each heat transfer tube 20 to 20
The thickness variations of the fins 30 to 30 are absorbed by the burring holes of the metal pipes, so that the tolerances of the thickness of each heat transfer tube and the height of each fin can be increased. And promote cost reduction. When assembling the two tanks 10, 10, the heat transfer tubes 20-20, and the fins 30-30 with each other, the left and right end openings of the heat transfer tubes 20-20 are connected to the left and right tanks 10, 10. After fitting in each long hole part of
Since the fins 30 to 30 may be brazed along the heat transfer tubes 20 to 20, assembly work as a heat exchanger becomes easy. When a refrigerant, which is a heat exchange fluid, flows into the joint member 40, the heat exchange fluid is transferred to each fin 3
Based on the heat dissipation effect of 0 to 30, the communicating metal pipes of the left tank 10, the heat transfer tubes communicating with them, and the communicating metal pipes of the right tank 10 communicating therewith are alternately arranged from the bottom to the top. And flows out from the joint member 50. In such a case, an appropriate flow of the heat exchange fluid that matches the heat exchange characteristics can be created only by changing the number of communicating sets of metal pipes in each tank 10. Further, as is clear from FIGS. 1 and 2, in the heat exchanger of this example, the fins 30 located at the uppermost position are used.
And the fins 30 located at the bottom are respectively the tanks 10.
Is arranged so as to project further outward than the upper and lower ends of the. Furthermore, on the uppermost and lowermost fins 30,
The side plate 60 is brazed. This rhino
The plate 60 is connected only to the fin 30. Therefore, when the foreign object from above the heat exchanger which is dropped accidentally and or heat exchanger when has dropped, the side plates 60 of the first outermost fin 30 collide, the rhino
It is possible to prevent a large impact from being applied to the tank 10 due to the deformation of the plate 60 and the fins 30. As described above, in the heat exchanger of this example, since the tank 10 is formed of a relatively thin metal pipe, the side plate is
Reducing the impact applied to the tank 10 by the port 60 and the fins 30 is extremely suitable for maintaining the pressure resistance of the tank 10. Furthermore, in the heat exchanger of this example, the lowermost fin 30 extends further outward than the lower surface of the tank 10, and as a result, the distance between the lower surface of the tank 10 and the tube 20 located at the lowermost position is increased. Can be made smaller. That is, if the tank 10 extends further below the lowermost fin 30, a space having a space larger than the width of the fin 30 is provided between the lowermost tube 20 and the lower surface of the tank 10. As will be appreciated, by arranging the lower surface of the tank 10 above the fins 30 as in the present invention, the space generated below the tube 20 maintained at the lowermost position can be made smaller. Here, in an automobile air conditioner, a lubricating oil is mixed with a refrigerant to circulate in a refrigeration cycle in order to lubricate a compressor. In this case, if the lubricating oil does not return favorably to the compressor, seizure of the compressor may occur, which is not desirable in the operation of the refrigeration cycle. Here, the lubricating oil discharged from the compressor is separated from the refrigerant as the internal volume of the condenser rapidly increases, and tends to accumulate below the condenser. In particular, the lower surface of the tank 10 is likely to accumulate lubricating oil separated from the gaseous refrigerant. However, in the case of the present invention, the space below the lowermost tube is set to be relatively small as described above. Therefore, even if the lubricating oil is separated from the refrigerant in the tank 10, The separated lubricating oil again flows into the lowermost tube 20 and circulates in the refrigeration cycle together with the refrigerant. Therefore, the condenser of the present invention can reduce the retention of the separated lubricating oil when it is used in the automobile air conditioner. In implementing the present invention, each joint member 4 is provided on the right side tank 10 instead of the left side tank 10.
0 or 50 may be attached, or only one of the joint members 40 and 50 may be attached to the right tank 10. Further, in the practice of the present invention, the metal pipes in each tank 10 may be laminated and fixed to each other by spot welding, existing brackets, or the like, instead of burring holes. Further, in carrying out the present invention, the present invention is not limited to a capacitor mounted on a vehicle, but the present invention may be applied to a capacitor for a general household air conditioner, for example.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway sectional view of a heat exchanger according to the present invention taken along line 1-1 of FIG. FIG. 2 is a partially cutaway sectional view of the heat exchanger taken along line 2-2 of FIG. FIG. 3 is a partially cutaway perspective view of the heat exchanger. [Explanation of Codes] 10 Tank 11 Lid 20 Heat Transfer Tube 21 Left End Opening 30 Fins P1, Pn Sealed Metal Pipes P11, Pn1 Long Holes

Claims (1)

What is claimed is: 1. A plurality of flat heat transfer tubes having a flat cross section through which a refrigerant passes, fins that are thermally coupled to the heat transfer tubes to promote heat dissipation of the refrigerant, and end portions of the heat transfer tubes are inserted. The fins are disposed between the plurality of heat transfer tubes and outside the heat transfer tubes located at the outermost side, and further to the outer side of the outermost fins.
Is provided with a side plate, the fin located at the outermost side of the fin is located outside the end of the tank, and the side plate is connected only to the fin.
A condenser for an air conditioner characterized by being combined .