JPH085199A - Air conditioner - Google Patents

Abstract

PURPOSE:To improve the reliability when HFC sole or mixed refrigerant as the refrigerant of an air conditioner. CONSTITUTION:The air conditioner comprises an evaporator 3 and a condenser 4 in which inlets are provided at the upper parts in a horizontal compressor 2, spiral discharge tube 15 and suction tube 16, and a capillary tube for connecting the compressor 2, the evaporator 3, the condenser 4 and a throttle unit 5 and in which an upward flowing part is thinner than a downward flowing part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner.

[0002]

2. Description of the Related Art Conventionally, CFC has been used as a refrigerant for air conditioners.
System or HCFC system is used, and various refrigerating machine oils such as mineral oil having high compatibility with CFC system or HCFC system refrigerant are used as refrigerating machine oil of the compressor.
However, these refrigerants will be totally abolished in the near future due to the problem of ozone layer destruction.

Therefore, in recent years, HFC type single or mixed refrigerants have been considered as alternatives to these refrigerants, and glycol compounds, ester compounds, etc. have been proposed as refrigerating machine oil for compressors (US Pat. No. 4,755,316). Japanese Patent Laid-Open No. 3-33193, etc.), both of which aim to completely dissolve the HFC-based refrigerant and the refrigerating machine oil, thereby ensuring oil return.

FIG. 5 is a cross-sectional view of an air conditioner using the HCFC 22, where 21 is the air conditioner main body, 22 is a compressor, and 23.
Is an evaporator, 24 is a condenser, 25 is a throttle device, 26 is a blower, 27 is a water tray for collecting condensed water, 28 is a drain port,
Reference numeral 29 is a drain tank, 30 is a suction grill, and 32 is an outlet. The refrigerant compressed by the compressor 22 is discharged to the condenser 24. At this time, the refrigerating machine oil used for lubrication of the compressor 22 is discharged together with the refrigerant to some extent. However, the compatibility with the refrigerant is so high that the condenser 2
4, passing through the expansion device 25 and the evaporator 23 and returning to the compressor 22.

[0005]

However, the glycol compound or ester compound refrigerating machine oil has insufficient abrasion resistance and low electrical resistivity as compared with the conventional mineral oil type oil, and is inferior in electric insulation. In addition, it has high hygroscopicity, and there are many problems during production such as moisture management not only for compressor components and finished products but also for moisture management during air conditioner assembly.When moisture enters the cycle, refrigerating machine oil is decomposed and compressed. There have been problems that the mechanical wear of the machine is promoted, and that the impurities block off the expansion device and cause cooling failure.

The present invention solves the above problems by using a mineral oil-based or synthetic oil-based refrigerating machine oil which is not completely compatible with a refrigerant but is excellent in electric insulation and hygroscopicity, and A highly reliable air conditioner can be realized by configuring a refrigeration system in which the discharged refrigeration oil is reliably returned to the compressor without being stagnant during the refrigeration cycle.

[0007]

In order to solve the above-mentioned problems, the present invention has a compressor, an evaporator, a condenser, a throttle device and a blower, and uses an HFC type single or mixed refrigerant as a refrigerant, An evaporator and a condenser configured such that refrigerating machine oil having a low compatibility with a refrigerant is used as refrigerating machine oil of the horizontal type compressor, and an upper part is an inlet and a lower part is an outlet above the horizontal type compressor. A spiral pipe is used as the suction pipe, and the discharge pipe that is directly connected to the horizontal compressor is used.The thin pipe is used for the part where the refrigerant flows upward, and the thick pipe is used for the part where the refrigerant flows downward. It was what I had.

The present invention also relates to a horizontal compressor, an evaporator,
Has a condenser, expansion device and blower, and uses HFC as a refrigerant
Using a single or mixed refrigerant of the system, using a refrigerating machine oil having low compatibility with the refrigerating machine oil of the horizontal compressor,
An evaporator and a condenser configured such that the upper part is an inlet and the lower part is an outlet are arranged above the horizontal compressor, and as a discharge pipe and a suction pipe directly connected to the horizontal compressor. A corrugated pipe is used, a thin pipe is used for the portion where the refrigerant flows upward, and a thick pipe is used for the portion where the refrigerant flows downward.

[0009]

The operation of the above means is as follows.

The present invention has a horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, and uses an HFC type single or mixed refrigerant as a refrigerant, which is used as refrigerating machine oil for the horizontal compressor. Using a refrigerating machine oil having low compatibility with a refrigerant, an evaporator and a condenser arranged so that the upper part is an inlet and the lower part is an outlet are arranged above the horizontal type compressor, and the horizontal type compression is performed. Refrigerator oil discharged from the compressor uses a discharge pipe directly connected to the machine, a spiral pipe as the suction pipe, a thin pipe for the upward flow of the refrigerant, and a thick pipe for the downward flow of the refrigerant. Does not stagnate during the refrigeration cycle and reliably returns to the compressor.

Furthermore, it has a horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, and uses a single or mixed refrigerant of HFC type as a refrigerant, and uses it as refrigerating machine oil for the horizontal compressor. Using a refrigerating machine oil having low compatibility with a refrigerant, an evaporator and a condenser arranged such that the upper part is an inlet and the lower part is an outlet above the horizontal compressor.
A discharge pipe directly connected to the horizontal compressor, a corrugated pipe is used as a suction pipe, a portion where the refrigerant flows upward is a thin pipe, and a portion where the refrigerant flows downward is a thick pipe. The discharged refrigerating machine oil returns to the compressor reliably without stagnation during the refrigeration cycle.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of an air conditioner,
FIG. 2 is a side view of only the compressor and the pipes connected to it. In FIG. 1, an air conditioner main body 1 is provided with a horizontal compressor 2, an evaporator 3, a condenser 4, a throttle device 5 and a blower 6 which constitute a refrigeration cycle. Has a water tray 7 for receiving condensed water, and the condensed water is collected in a drain tank 8 through a drain port. Further, the air is sucked in from the suction grille 9, passes through the evaporator 3 and the condenser 4, and is blown out from the outlet 10. Further, as a refrigerating machine oil for the horizontal compressor 2, a conventional refrigerant CFC1 is used.
2 or mineral oil with a proven track record in HCFC22 is used. An evaporator 3 and a condenser 4 are provided above a horizontal compressor 2 provided inside the air conditioner main body 1, and in the evaporator 3, the refrigerant exits from an inlet portion 11 and exits from an outlet portion 12. The condenser 4 is configured to enter through the refrigerant inlet portion 13 and exit through the outlet portion 14. Further, among the pipes connecting the horizontal compressor 2, the evaporator 3, the condenser 4, and the expansion device 5, the pipes 15, 17 and 18 of the portion where the refrigerant flows upward are thinner than the pipe 16 of the portion where the refrigerant flows downward. It is configured to be. The discharge pipe 15 coming out of the horizontal compressor 2 is a spiral pipe to prevent vibration absorption and stagnation of refrigerating machine oil. The suction pipe 16 entering the horizontal compressor 2 is also a spiral pipe like the discharge pipe 15. By disposing the condenser 4 above the horizontal compressor 2 in this way, the discharge amount of the refrigerating machine oil to the condenser 4 can be reduced, and a small amount of the refrigerating machine oil discharged together with the refrigerant can enter the condenser 4 at the inlet. Is the upper part and the outlet is the lower part.
The refrigerating machine oil circulated without stagnation in the condenser 4 circulates by gravity in the downward pipe portion, circulates with the refrigerant whose flow rate is increased in the upward portion, and flows into the evaporator 3. . Refrigerating machine oil that has flowed into the evaporator 3 has the inlet of the evaporator 3 at the top and the outlet at the bottom.
Without stagnation, it passes through the spiral pipe to the horizontal compressor 2 provided below the evaporator 3, and surely returns without stagnation in the middle.

Next, a second embodiment will be described with reference to FIGS. FIG. 3 is a sectional view of the air conditioner, and FIG.
[Fig. 3] is a side view of only a compressor and piping connected to it.
In FIG. 3, the air conditioner main body 1 is equipped with a horizontal compressor 2, an evaporator 3, a condenser 4, a throttle device 5 and a blower 6 that constitute a refrigeration cycle. Has a water tray 7 for receiving condensed water, and the condensed water is collected in a drain tank 8 through a drain port. Further, the air is sucked in from the suction grille 9, passes through the evaporator 3 and the condenser 4, and is blown out from the outlet 10. Further, as the refrigerating machine oil of the horizontal compressor 2, mineral oil that has a proven record in the conventional refrigerant CFC12 or HCFC22 is used. An evaporator 3 and a condenser 4 are provided above the horizontal compressor 2 provided inside the air conditioner body 1, and in the evaporator 3, the refrigerant enters from the inlet 11 and enters from the outlet 12. The condenser 4 is configured so that it exits, and the condenser 4 enters through the refrigerant inlet 13 and exits through the outlet 14. Further, among the pipes connecting the horizontal compressor 2, the evaporator 3, the condenser 4 and the expansion device 5, the pipes 17, 18 and 19 of the portion where the refrigerant flows upward are the pipes 20 of the portion where the refrigerant flows downward.
It is designed to be thinner. Further, the discharge pipe 19 coming out of the horizontal compressor 2 has a corrugated pipe in order to absorb vibration and prevent stagnation of refrigerating machine oil. Further, the suction pipe 20 coming into the horizontal compressor 2 is also the discharge pipe 19.
Like the corrugated pipe. By disposing the condenser 4 above the horizontal compressor 2 in this manner, the discharge amount of the refrigerating machine oil to the condenser 4 can be reduced, and a small amount of the refrigerating machine oil discharged together with the refrigerant can be discharged to the condenser 4. With the inlet at the top and the outlet at the bottom, it circulates in the condenser 4 without stagnation, and the refrigerating machine oil flowing out of the condenser 4 circulates by gravity in the downward pipe portion and narrows the pipe in the upward portion to make the flow velocity. Circulates with the increased refrigerant and flows into the evaporator 3. Evaporator 3
The refrigerating machine oil that has flowed into the evaporator 3 has the inlet at the upper part and the outlet at the lower part, so that it does not stagnate in the evaporator 3,
It passes through the corrugated pipe to the horizontal compressor 2 provided below the evaporator 3 and surely returns without being stagnant on the way.

[0014]

As can be seen from the above description, the present invention has a horizontal compressor, an evaporator, a condenser, a throttle device and a blower, and uses an HFC type single or mixed refrigerant as the refrigerant. Although the compatibility of the refrigerating machine oil of the horizontal type compressor with the refrigerant is low, CFC12 or HCFC22 has a track record,
Mineral oil, which has better wear resistance, electrical insulation, less hygroscopicity and is easier to use than glycol compound or ester compound refrigerating machine oil, which has high compatibility with HFC refrigerants, is used above the horizontal compressor. Arrange an evaporator and a condenser configured so that the upper part of each is an inlet and the lower part is an outlet, using a discharge pipe directly connected to the horizontal compressor, a spiral pipe as a suction pipe, and a refrigerant. By using a thin pipe for the portion where the refrigerant flows upward and a thick pipe for the portion where the refrigerant flows downward, the discharge amount of the refrigerating machine oil to the condenser can be reduced, and the amount of the refrigerating machine oil discharged from the compressor together with the refrigerant can be reduced. Since the condenser has an inlet at the top and an outlet at the bottom, it circulates without stagnation in the middle, and the refrigerating machine oil coming out of the condenser circulates by gravity in the downward pipe part and narrows the pipe in the upward part. It circulated together with the refrigerant raising the flow rate, and flows into the evaporator. In the evaporator, the refrigerating machine oil that has flowed into the evaporator has an inlet at the top and an outlet at the bottom, so the horizontal compressor installed below the evaporator without stagnation on the way,
It surely returns without stagnation on the way through the spiral pipe. By constructing such a system, it is possible to solve problems such as water content management in the manufacturing process, use the same manufacturing equipment as the conventional one, and improve the reliability of the system. Further, this time, the effect of the mineral oil type has been described, but the same effect can be obtained also with the synthetic oil type having a low compatibility with the HFC type refrigerant.

Further, it has a horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, and uses a single or mixed refrigerant of HFC type as a refrigerant, and uses it as refrigerating machine oil for the horizontal compressor. CFC12 or HCFC22, which has low compatibility with refrigerants, has a proven track record, and is superior in wear resistance, electrical insulation and hygroscopicity to glycol compound or ester compound refrigerating machine oil, which has high compatibility with HFC refrigerants. A good mineral oil is used, and an evaporator and a condenser configured so that the upper part is an inlet and the lower part is an outlet are arranged above the horizontal compressor, and are directly connected to the horizontal compressor. By using corrugated pipes as the discharge pipe and the suction pipe, and using thin pipes for the part in which the refrigerant flows upward and thick pipes for the part in which the refrigerant flows downward, discharge the refrigeration oil to the condenser. The amount of refrigerating machine oil that can be reduced and that is discharged from the compressor together with the refrigerant circulates without stagnation on the way because the inlet is up and the outlet is down in the condenser, and the refrigerating machine oil that emerges from the condenser is downward. The pipe part of circulates by gravity, and the upward part circulates together with the refrigerant having a narrowed pipe and increased flow velocity, and flows into the evaporator. Refrigerator oil flowing into the evaporator has an inlet at the top and an outlet at the bottom in the evaporator, so it does not stagnate in the middle, passes through a corrugated pipe to a horizontal compressor installed below the evaporator, and stagnates in the middle. Will definitely return without doing. By constructing such a system, it is possible to solve problems such as water content management in the manufacturing process, use the same manufacturing equipment as the conventional one, and improve the reliability of the system. Further, this time, the effect of the mineral oil type has been described, but the same effect can be obtained also with the synthetic oil type having a low compatibility with the HFC type refrigerant.

[Brief description of drawings]

FIG. 1 is a sectional view of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a side view of the compressor and piping in the first embodiment of the present invention.

FIG. 3 is a sectional view of an air conditioner according to a second embodiment of the present invention.

FIG. 4 is a side view of a compressor and piping according to a second embodiment of the present invention.

5 is a sectional view of a conventional example.

[Explanation of symbols]

 2 Horizontal compressor 3 Evaporator 4 Condenser 5 Throttling device 6 Blower 15 Spiral discharge pipe 16 Spiral suction pipe 19 Wavy discharge pipe 20 Wavy suction pipe

Claims (2)

[Claims] 1. A horizontal type compressor, an evaporator, a condenser, a throttle device and a blower, wherein a single or mixed refrigerant of HFC type is used as a refrigerant, and a refrigerant is used as refrigerating machine oil of the horizontal type compressor. Using a refrigerating machine oil having a low compatibility with, an evaporator and a condenser configured such that the upper portion is an inlet and the lower portion is an outlet are arranged above the horizontal type compressor, and the horizontal type compressor is arranged. An air conditioner in which spiral pipes are used as the discharge pipe and the suction pipe that are directly connected to the pipe, and the pipe in which the refrigerant flows upward is thin and the pipe in which the refrigerant flows downward is thick. 2. A horizontal type compressor, an evaporator, a condenser, a throttle device and a blower, wherein a single or mixed refrigerant of HFC type is used as a refrigerant, and a refrigerant is used as refrigerating machine oil of the horizontal type compressor. Using a refrigerating machine oil having a low compatibility with, an evaporator and a condenser configured such that the upper portion is an inlet and the lower portion is an outlet are arranged above the horizontal type compressor, and the horizontal type compressor is arranged. An air conditioner in which corrugated pipes are used as the discharge pipe and the suction pipe that are directly connected to the pipe, and the pipe in which the refrigerant flows upward is thin and the pipe in which the refrigerant flows downward is thick.