JPH03211375A - Heat exchanger for air conditioner - Google Patents

Abstract

PURPOSE:To improve the durability of a compressor and the heat exchanging capacity of a heat exchanger with preventing refrigerating machine oil dissolved in working fluid from accumulating in header pipes, by a method wherein small holes are provided on partition plates by which the insides of the header pipes are respectively divided into two or more sections. CONSTITUTION:Small holes 5b are provided on partition plates 5a by which the insides of header pipes 3A and 3B are respectively divided into two or more sections. The low pressure working liquid flows down from the upper part to the lower part of a heat exchanger 4a as evaporating in oval heat transfer pipes 1. The refrigerating machine oil dissolved in the working liquid accumulates in the header pipes 3A and 3B between the partition plates 5a, by which the insides of the header pipes 3A and 3B are divided, and the oval heat transfer pipes 1, however, it passes through the small holes 5b provided on the partition plates 5a, reaches the lower parts of the header pipes 5A and 5B, and is recovered to a compressor 9 through a suction pipe 11 after passing through a gas pipe 7 and a four-way valve 8. Thereby, lubrication in the compressor 9 is improved, resulting in improvement of durability of the compressor and the heat exchanging capacity of the heat exchanger 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchanger for an air conditioner used in an evaporator, condenser, etc. in the field of air conditioning equipment.

BACKGROUND OF THE INVENTION In recent years, heat exchangers in which a pair of header tubes are provided at both ends of a flat heat exchanger tube have been increasingly used.

As shown in FIG. 2, an air conditioning system using this type of heat exchanger has flat heat exchanger tubes 1 and corrugated fins 2 stacked in an alternate arrangement, and both ends of the flat heat exchanger tube 1 are connected to a pair of header tubes 3A, 3B. The heat exchanger 4 connected with the header pipe 3A
, 3B is partitioned with a partition plate 5 to gradually increase the cross-sectional area of the working fluid flow from the top to the bottom, and the top of the header pipe 3A is connected to the liquid pipe 6, and the bottom of the header pipe 3A is connected to the gas pipe 7. has been done. The four-way valve 8 is connected to a gas pipe 7, a discharge pipe IO and a suction pipe 11 of the compressor 9, and an indoor heat exchanger 12. Further, the liquid pipe 6 and the indoor heat exchanger 12 are connected to the capillary tube 13 .

During cooling operation, the discharge pipe 10 and the gas pipe 7 are connected to the suction pipe 11 and the indoor heat exchanger 12 by switching the four-way valve 8 . During heating operation, the four-way valve 8 is switched so that the discharge pipe 10 and the indoor heat exchanger 12 are connected, and the suction pipe 11 and the gas pipe 7 are connected.

Problem to be Solved by the Invention However, in the above configuration, during heating operation, the high pressure working fluid gas discharged from the discharge pipe 10 of the compressor 9 is condensed and liquefied in the indoor heat exchanger 12, and the pressure is reduced in the cabillary tube 13. The liquid flows into the heat exchanger 4 through the liquid pipe 6. This low-pressure working fluid flows from the upper part of the heat exchanger 4 to the lower part while evaporating in the flat heat exchanger tube 1. The refrigerating machine oil dissolved in the working fluid is then removed from the header pipes 3A and 3 between the partition plate 5 that partitions the header pipes 3A and 3B and the flat heat exchanger tube l.
It remains in the compressor B and is not recovered by the compressor 9, causing problems with lubrication within the compressor 819 and deteriorating the durability of the compressor 9.

The present invention solves the above problems, and aims to provide a heat exchanger for an air conditioner in which the durability of the compressor does not deteriorate.

Means for Solving the Problems In order to achieve the above object, the present invention has a plurality of flat heat exchanger tubes and corrugated fins stacked in an alternate arrangement, and both ends of each flat heat exchanger tube are connected to a pair of header tubes. Small holes are provided in the partition plate that partitions the inside of the tube into multiple sections.

Effect of the present invention With the above-described configuration, when the heat exchanger is made to function as an evaporator by switching the four-way valve, the working fluid flowing in from the liquid pipe of the heat exchanger evaporates in the flat heat exchanger tube and evaporates into the heat exchanger. When flowing from the top to the bottom, even if the refrigeration oil dissolved in the working fluid accumulates at the top of the partition plate, it will flow down to the bottom of the header pipe through the small hole provided in the partition plate and pass through the gas pipe. is recovered from the suction pipe to the compressor, improving lubrication within the compressor and improving the durability of the compressor.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. In addition, in the present invention, a small hole through which refrigerating machine oil passes is provided in the partition plate of the conventional example, and the same parts as those of the conventional example are given the same numbers and explanations are omitted. As shown in the figure, there are small holes 5 in the partition plate 5a.
b is provided to constitute a heat exchanger 4a.

To explain the operation in the above configuration, during heating operation,
High-pressure working fluid gas discharged from the discharge pipe 10 of the compressor 9 is condensed and liquefied in the indoor heat exchanger 12, reduced in pressure by the capillary tube, and flows through the liquid pipe 6 into the heat exchanger 4a. This low-pressure working fluid flows from the upper part of the heat exchanger 4a to the lower part of the heat exchanger 4a while pulsating in the flat heat exchanger tube I.9 The refrigerating machine oil that was dissolved in the working fluid flows through the partition plate that partitions the header pipes 3A and 3B. 5a and the header tube 3A between the flat heat exchanger tube 1.

3B, it passes through the small hole 5b provided in the partition plate 5a, reaches the lower part of the header pipes 3A and 3B, and is collected from the gas pipe 7, through the four-way valve 8, and from the suction pipe 1] to the compressor 9. The lubrication inside the compressor 9 is improved, and the durability of the compressor 9 is improved.

Next, during cooling operation, the high pressure working fluid gas discharged from the discharge pipe 10 of the compressor 9 passes through the gas pipe 7 to the heat exchanger 4.
flows into a. This working fluid gas is condensed and liquefied in the flat heat transfer tube 1 and then flows from the lower part to the upper part of the heat exchanger 4a. The condensed and liquefied working fluid liquid accumulates in the header tubes 3A and 3B at the upper part of the partition plate 5a. Since the working fluid gas rises from the lower part of the small hole 5b provided in the partition plate 5a and lifts the working fluid liquid, it does not accumulate and the heat exchange ability of the heat exchanger 4a is improved.

Effects of the Invention As is clear from the above embodiments, according to the present invention, small holes are provided in the partition plate that divides the inside of the header pipe into a plurality of sections, so that the refrigerating machine oil dissolved in the working fluid is drained. It is possible to provide a heat exchanger for an air conditioner in which there is no accumulation inside the pipe, refrigerating machine oil is recovered by the compressor, the durability of the compressor is improved, and the heat exchange ability of the heat exchanger is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a refrigerant circuit of an air conditioner using a heat exchanger according to an embodiment of the present invention, and FIG. 2 is a block diagram of a refrigerant circuit of an air conditioner using a conventional heat exchanger. 1... Flat heat transfer tube, 2... Corrugated fin, 3A, 3B... Header tube, 4a...
...Heat exchanger, 5a...Partition plate, 5b...
...Small hole.

Claims (1)

[Claims] A plurality of flat heat exchanger tubes, corrugated fins stacked alternately with the flat heat exchanger tubes, a pair of header tubes connected to both ends of the flat heat exchanger tubes, and an interior of the header tubes partitioned into a plurality of sections. A heat exchanger for an air conditioner that has a partition plate with small holes through which refrigerating machine oil passes.