JP2004347162A - Condenser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condenser for efficiently supplying lubricating oil to a compressor without causing the residence of lubricating oil components. <P>SOLUTION: The condenser comprises upper and lower header pipes 12 connected together via a plurality of heat exchanging tubes 21 and partition walls 20 for sectioning the header pipes 12 at their insides in the directions of their major axes, the header pipes 12 and the heat exchanging tubes 21 being sectioned into a plurality of condensation parts corresponding to the partition walls 20. A communication hole 31 is formed in the lower end of the partition wall 20 in the lower header pipe 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a so-called longitudinal flow condenser in which a heat exchange medium flows in a vertical direction.
[0002]
[Prior art]
Normally, automobiles are provided with a number of heat exchangers such as a radiator for cooling an engine, a condenser for air conditioning, an oil cooler for cooling transmission oil for automatic vehicles (ATF cooler) and an oil cooler for cooling engine oil. ing. As the condenser, a vertical flow condenser in which a heat exchange medium flows in a vertical direction (longitudinal direction) is employed. This vertical flow condenser is built in series between the compressor and the evaporator, compresses the heat exchange medium with the compressor, radiates and condenses it with the vertical flow condenser, and sends it out to the evaporator via the liquid tank. I have.
[0003]
Here, lubricating oil is mixed in the heat exchange medium to lubricate the compressor, and inserted into the upper header pipe to prevent the lubrication oil from remaining in the heat exchange medium in the upper header pipe of the condenser. A notch is formed at the upper end of the heat exchange tube (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-10-185361
[Problems to be solved by the invention]
However, in the conventional condenser, since the lubricating oil retained in the upper header pipe is configured to flow to the lower header pipe, the lubricating oil remains in the lower header pipe and requires lubrication. Lubricating oil may not be sufficiently supplied to the compressor, and the driving torque of the compressor may increase to lower the fuel efficiency.
[0006]
Therefore, an object of the present invention is to provide a condenser that can efficiently supply lubricating oil to a compressor without retaining lubricating oil components.
[0007]
[Means for Solving the Problems]
The condenser according to claim 1, wherein an upper header pipe and a lower header pipe are arranged at intervals in a vertical direction, and these header pipes are connected to each other by a plurality of heat exchange tubes, while the heat exchange pipes are connected to each other. A condenser in which a partition wall that defines the inside of the tube in the longitudinal direction is provided, and the header pipe and the heat exchange tube are defined in a plurality of condensing sections corresponding to the partition wall, wherein the lower header is provided. A communication hole is formed in a partition wall provided in the pipe.
[0008]
The capacitor described in claim 2 is the capacitor according to claim 1, wherein the communication hole is arranged at a lower end portion of a partition wall.
[0009]
【The invention's effect】
According to the condenser described in the first aspect, since the communication hole is formed in the partition wall provided in the lower header pipe, the lubricating oil component separated from the heat exchange medium is condensed to the adjacent condensation via the communication hole. After being sent to the lower header pipe of the section, it is discharged outside the condenser together with the heat exchange medium. Therefore, the circulation amount of the lubricating oil in the heat exchange system including the condenser can be sufficiently ensured.
[0010]
According to the capacitor described in the second aspect, since the communication hole is disposed at the lower end of the partition wall, the effect according to the first aspect can be further enhanced. The heat exchange medium contained in the header pipe of the condenser contains lubricating oil. When the lubricating oil is separated, the lubricating oil has a higher density and accumulates on the lower side. Therefore, by providing the communication hole at the lower end of the partition wall, the lubricating oil can be more efficiently moved to the adjacent condensing section via the communication hole.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a perspective view showing a capacitor 10 according to an embodiment of the present invention. As shown in FIG. 1, the condenser 10 includes a cylindrical upper header pipe 11 disposed above, a cylindrical lower header pipe 12 disposed below, the upper header pipe 11 and the lower header pipe 11. And a core portion 13 for connecting the header pipe 12 up and down.
[0013]
An inlet block 14 is attached to the inlet side (the right side in FIG. 1) of the upper header pipe 11 by brazing, and the inlet block 14 is provided with an inlet port 15 therethrough. The inlet port 15 is provided in communication with the inside of the upper header pipe 11. On the outlet side (left side in FIG. 1) of the upper header pipe 11, an outlet block 17 provided with an outlet port 16 therethrough is attached by brazing. In the upper header pipe 11, two partition walls 18 and 19 are disposed at intervals in the longitudinal direction, and the upper header pipe 11 is divided into three chambers in the longitudinal direction by these partition walls 18 and 19. Is defined.
[0014]
Further, the lower header pipe 12 is arranged as a pair with the upper header pipe 11, and one partition wall 20 is provided at a position corresponding to an intermediate portion between the two partition walls 18 and 19 in the upper header pipe 11. Are arranged. The partition wall 20 defines the lower header pipe 12 as two chambers in the longitudinal direction.
[0015]
The core portion 13 includes a plurality of heat exchange tubes 21 extending in the vertical direction and fins 22 disposed between the heat exchange tubes 21 and extending left and right. Side plates 23 and 24 are attached to both ends. The core portion 13 is formed by the partition walls 18, 19, 20 along the longitudinal direction of the header pipes 11, 12 from the inlet block 14 side to the outlet block 17 side, along the first to fourth condensing portions 25, 26,. 27, 28. In addition, in order to make the structure of the core part 13 clear, FIG. 1 illustrates only a part of each of the heat exchange tubes 21 and the fins 22.
[0016]
In the condenser 10, as described later, a heat exchange medium 29 sent from a compressor (not shown) enters the upper header pipe 11 from the inlet port 15 of the inlet block 14 and passes through the first condenser 25 of the core 13. And flows into the lower header pipe 12 to make a U-turn (first turn) in the lower header pipe 12 to ascend in the second condensing section 26. Next, it flows into the upper header pipe 11, makes a U-turn (second turn) again in this upper header pipe 11, flows downward in the third condensing section 27, and makes a U-turn (third turn) in the lower header pipe 12. ), The liquid rises in the fourth condenser section 28, and flows from the outlet block 17 to a liquid tank (not shown).
[0017]
Here, as shown in FIG. 2 which is an enlarged view of the portion A in FIG. 1, in the vicinity of the partition wall 20 of the lower header pipe 12, the lubricating oil 30 separated from the heat exchange medium 29 flows upstream of the partition wall 20 in the flow direction. It is easy to stay. Hereinafter, a brief description will be given.
[0018]
The heat exchange medium 29 and the lubricating oil 30 have a two-layer separation temperature at which the lubricating oil 30 does not dissolve in the heat exchange medium 29 depending on the temperature of the heat exchange medium 29 due to the difference in their physical property values. For example, when HFC134a is used as the heat exchange medium 29 and rotary compressor oil is used as the lubricating oil 30, the two-layer separation temperature is about 60 ° C. This is a temperature at which two layers are sufficiently separated even when the air conditioner is operated at a normal outside air temperature. Since the heat exchange medium 29 immediately after entering the condenser 10 is in a gaseous state, the density of the lubricating oil 30 is higher, and when separated into two layers, the lubricating oil 30 having a higher density than the heat exchange medium 29 Stay on the lower side. Further, as shown in FIG. 2, the vicinity of the partition wall 20 is a portion where the flow of the heat exchange medium 29 changes upward, so that the stagnation inherently tends to occur.
[0019]
In the present embodiment, as shown in FIGS. 2 and 3, a communication hole 31 having a perfect circular shape is formed in the partition wall 20. The communication hole 31 is provided to penetrate the partition wall 20 in the thickness direction of the partition wall 20, and is arranged at a lower end portion of the partition wall 20 in the height direction. In the present embodiment, the number of the communication holes 31 is one. However, the number of the communication holes 31 is not limited to two, and may be two or more.
[0020]
Next, the flow of the heat exchange medium 29 according to the present embodiment will be described with reference to FIG.
[0021]
FIG. 4 is a schematic diagram illustrating a flow of the heat exchange medium 29 in the heat exchanger system including the condenser 10 according to the present embodiment.
[0022]
First, the heat exchange medium 29 contains a lubricating oil 30 for lubricating the compressor 32. The heat exchange medium 29 is compressed by the compressor 32 and then sent to the condenser 10. In the condenser 10, as described with reference to FIG. 2, the lubricating oil 30 separated via the communication hole 31 formed at the lower end of the partition wall 20 flows to the adjacent third condensing section 27. The heat exchange medium 29 of the third condenser 27 is cooled by the heat radiation of the condenser 10 and has a temperature at which the lubricating oil 30 is sufficiently dissolved in the heat exchange medium 29. Therefore, the flowing lubricating oil 30 is dissolved in the heat exchange medium 29 and flows as it is from the outlet port 16 to the liquid tank 33 together with the heat exchange medium 29. Further, the heat exchange medium 29 flows to the compressor 32 via the expansion valve 34 and the evaporator 35, and repeats the flow described above.
[0023]
As described above, according to the present embodiment, even when the lubricating oil 30 for the compressor is mixed in the heat exchange medium 29, the lubricating oil 30 flows without remaining in the lower header pipe 12 of the condenser 10. Therefore, the lubricating oil is sufficiently supplied to the compressor 32 that requires lubrication, so that an increase in the driving torque of the compressor 32 can be avoided.
[0024]
The capacitor according to the present invention can be variously modified and modified without being limited to the embodiments described above.
[0025]
For example, in the above embodiment, the liquid tank 33 is described as a separate capacitor, but the present invention can be applied to various types of capacitors, such as a liquid tank integrated type and a capacitor with a subcooler, as long as it is a vertical flow type capacitor. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing a capacitor according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a portion A in FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 2;
FIG. 4 is a schematic diagram showing a flow of a heat exchange medium in a heat exchanger system according to an embodiment of the present invention.
[Explanation of symbols]
11 Upper header pipe 12 Lower header pipes 18, 19, 20 Partition wall 21 Heat exchange tube 25 First condenser 26 Second condenser 27 Third condenser 28 Fourth condenser 31 Communication hole

Claims (2)

An upper header pipe (11) and a lower header pipe (12) are arranged at intervals in the vertical direction, and these header pipes (11, 12) are connected to each other by a plurality of heat exchange tubes (21). Partition walls (18 to 20) which define the inside of the header pipes (11, 12) in the longitudinal direction are provided, and the header pipes (11, 12) and the heat pipes (11, 12) correspond to the partition walls (18 to 20). A condenser in which a replacement tube (21) is defined in a plurality of condensing sections (25 to 28),
A communication hole (31) is formed in a partition wall (20) provided in said lower header pipe (12). The capacitor according to claim 1, wherein the communication hole (31) is arranged at a lower end of the partition wall (20).

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