JPH085200A - Air conditioner - Google Patents

Abstract

PURPOSE:To improve the reliability when HFC sole or mixed refrigerant is used as the refrigerant of an air conditioner. CONSTITUTION:The air conditioner comprises an evaporator 3 and a condenser 4 in which inlets are provided above a compressor 2, and a finer 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. 3 is a cross-sectional view of an air conditioner using an HCFC22, 19 is an air conditioner body, 20 is a compressor, and 21 is a compressor.
Is an evaporator, 22 is a condenser, 23 is a throttle device, 24 is a blower, 25 is a water tray for storing condensed water, 26 is a drain port,
27 is a drain tank, 28 is a suction grill, and 29 is an outlet. The refrigerant compressed by the compressor 20 is discharged to the condenser 22, and the refrigerating machine oil used for lubrication of the compressor 20 at this time is discharged together with the refrigerant to some extent. However, the compatibility with the refrigerant is so high that the condenser 2
2. Return to the compressor 20 through the expansion device 23 and the evaporator 21.

[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 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. A refrigerating machine oil having a low compatibility with a refrigerant is used as a refrigerating machine oil of the compressor, the evaporator and the condenser are arranged above the compressor, and an upper portion of each of the evaporator and the condenser is an inlet and a lower portion. The air conditioner is configured so that the outlet becomes the outlet.

The present invention also provides a compressor, an evaporator, a condenser,
It has a throttle device and an air blower, uses a single or mixed HFC refrigerant as a refrigerant, uses refrigerating machine oil having low compatibility with the refrigerant as the refrigerating machine oil of the compressor, and the portion in which the refrigerant flows upward is a thin pipe. A thick pipe is used for the portion in which the refrigerant flows downward.

The present invention also provides a compressor, an evaporator, a condenser,
A refrigerating machine oil having a throttle device and a blower, HFC type single or mixed refrigerant is used as a refrigerant, refrigerating machine oil having a low compatibility with the refrigerant is used as the refrigerating machine oil of the compressor, and an upper part of each of them is provided above the compressor. The evaporator and the condenser are arranged so that the refrigerant is an inlet and the lower portion is an outlet. 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.

[0010]

The operation of the above means is as follows.

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, and the refrigerating machine oil of the compressor is compatible with the refrigerant. By using a low refrigerating machine oil and arranging an evaporator and a condenser configured so that the upper part of each is an inlet and the lower part is an outlet above the compressor, the refrigerating machine oil does not stagnate in the heat exchanger and heat is generated. Not only can the reduction of exchange efficiency be reduced, but also the refrigerating machine oil can surely return from the evaporator to the compressor.

Furthermore, it 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, and the refrigerating machine oil of the compressor is compatible with the refrigerant. By using a low refrigerating machine oil and using a thin pipe in the portion where the refrigerant flows upward to increase the flow velocity of the refrigerant, and using a thick pipe in the portion where the refrigerant flows downward, the refrigerating machine oil can be prevented from stagnating in the pipe.

Furthermore, a compressor, an evaporator, a condenser, a throttle device and a blower are provided, and an HFC type single or mixed refrigerant is used as a refrigerant, and the refrigerating machine oil of the compressor has compatibility with the refrigerant. Using a low refrigerating machine oil, an evaporator and a condenser arranged so that the upper part is the inlet and the lower part is the outlet are arranged above the compressor, and the portion in which the refrigerant flows upward is a thin pipe, and the refrigerant is directed downward. By using a thick pipe in the flowing portion, the refrigerating machine oil reliably returns to the compressor without being stagnant during the cycle.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. Inside the air conditioner body 1, a compressor 2, an evaporator 3, a condenser 4, and a throttle device 5 that constitute a refrigeration cycle.
And a blower 6, and a condenser 4 and an evaporator 3 are provided above the compressor 2. In the evaporator 3, the refrigerant is configured to enter from the inlet portion 11 to the outlet portion 12, and similarly, in the condenser 4, the refrigerant is configured to enter from the inlet portion 13 and exit from the outlet portion 14. A water tray 7 for receiving condensed water is provided under the evaporator 3, and the condensed water is collected in a drainage tank 8 through a drain port. Also, air is sucked in through the intake grill 9 and the evaporator 3
It is blown out from the blow-out port 10 through the condenser 4. Further, as a refrigerating machine oil of the compressor 2, a conventional refrigerant CFC12 is used.
Alternatively, a mineral oil that has a proven record in HCFC22 is used. By disposing the condenser 4 above the compressor 2 in this manner, the discharge amount of the refrigerating machine oil to the condenser 4 can be reduced.
In addition, the refrigerating machine oil circulates in the heat exchanger without stagnation by making the inlets of the evaporator 3 and the condenser 4 upper and the outlets lower. Further, the refrigerating machine oil flowing into the evaporator 3 surely returns to the compressor provided in the lower part of the evaporator.

Next, a second embodiment will be described with reference to FIG. Reference numerals 15, 16, 17, and 18 denote pipes that connect the compressor 2, the evaporator 3, the condenser 4, and the expansion device 5 provided inside the air conditioner main body 1, and refrigerant flows upward in the pipes 15, 17, and 18. Pipes and 16 are pipes in which the refrigerant flows downward, and pipes 15, 16 and 17 flowing in the upward direction are thinner than those in the downward direction in order to increase the flow velocity of the refrigerant. As a result, the refrigerating machine oil discharged together with the refrigerant circulates due to gravity in the downward pipe portion, and circulates with the refrigerant whose upward flow portion has a narrowed pipe to increase the flow velocity, so that the refrigerating machine oil does not stay during the cycle. The refrigerating machine oil is the same as in the first embodiment.

Next, a third embodiment will be described with reference to FIG. A compressor 2 is provided inside the air conditioner body 1, and an evaporator 3 and a condenser 4 are provided above the compressor 2, and in the evaporator 3, the refrigerant enters and exits through an inlet 11. It is configured so as to exit from the portion 12, and the refrigerant in the condenser 4 is configured to enter through the inlet portion 13 and exit through the outlet portion 14. Of the pipes connecting the compressor 2, the evaporator 3, the condenser 4 and the expansion device 5, the pipes 15, 17 and 18 in the portion in which the refrigerant flows upward are made thinner than the pipe 16 in the portion that flows downward. Has been done. By arranging the condenser 4 above the 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 has an upper part at the inlet of the condenser 4,
With the outlet at the bottom, it circulates in the condenser 4 without stagnation, and the refrigerating machine oil flowing out from the condenser 4 circulates by gravity in the downward pipe portion, and the upward portion makes the pipe thinner and the flow velocity is higher. It circulates with and flows into the evaporator 3. The refrigerating machine oil that has flowed into the evaporator 3 is surely returned to the compressor provided below the evaporator without the stagnant refrigerating machine oil in the evaporator 3 by setting the inlet of the evaporator 3 to the upper side and the outlet to the lower side. . The refrigerating machine oil is the same as in the first embodiment.

[0017]

As can be seen from the above description, 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, Refrigerator oil has a low compatibility with the refrigerant, but has a proven track record with CFC12 or HCFC22, and it has better wear resistance, electrical insulation and hygroscopicity than glycol compound or ester compound type refrigerating machine oil that has a high compatibility with HFC refrigerants. Discharge amount of refrigeration oil to the condenser by arranging an evaporator and a condenser configured so that the upper part is the inlet and the lower part is the outlet using the mineral oil which is few and easy to use. In addition, the refrigerating machine oil discharged together with the refrigerant can circulate in the heat exchanger without stagnation, and returns to the compressor provided in the lower part of the evaporator. By configuring such a system, it is possible not only to solve problems such as moisture management in the manufacturing process but also to use the same manufacturing equipment as before.
The reliability of the system can be improved and the decrease in heat exchange efficiency can be reduced. Also, this time, the effect of mineral oil type is described, but the same effect can be obtained with synthetic oil type which has low compatibility with HFC type refrigerant.

Further, it has a compressor, an evaporator, a condenser, a throttle device and a blower, and uses an HFC type single or mixed refrigerant as the refrigerant, and the refrigerating machine oil of the compressor has a low compatibility with the refrigerant. CFC12 or HCFC22 has a proven track record, and is a refrigerant that uses a mineral oil that is more compatible with HFC-based refrigerants and that has better wear resistance, electrical insulation, and less hygroscopicity than a glycol compound or ester compound-based refrigerating machine oil. , The thin pipe is used for the part that flows upward, and the thick pipe is used for the part that flows downward. It circulates with the refrigerant, and the refrigerating machine oil circulates without stagnation during the cycle. By constructing such a system, it is possible to solve problems such as water content management in the manufacturing process, to use the same manufacturing equipment as the conventional one, and to improve the reliability of the system. Also, this time, the effect of mineral oil type is described, but the same effect can be obtained with synthetic oil type which has low compatibility with HFC type refrigerant.

Further, it has a compressor, an evaporator, a condenser, a throttle device and a blower, and uses an HFC type single or mixed refrigerant as the refrigerant, and the refrigerating machine oil of the compressor has a low compatibility with the refrigerant. Has a track record of CFC12 or HCFC22, and uses mineral oil that is more wear-resistant and electric insulating, has less hygroscopicity and is more user-friendly than glycol compound or ester compound-based refrigerating machine oil, which is highly compatible with HFC-based refrigerants, and compresses it. An evaporator and a condenser arranged so that the upper part is the inlet and the lower part is the outlet are arranged above the machine,
By using a thin pipe for the part where the refrigerant flows upward and a thick pipe for the part where the refrigerant flows downward, the discharge amount of the refrigerating machine oil to the condenser can be reduced, and some refrigerating machine oil discharged with the refrigerant is condensed. Since the inlet is on the top and the outlet is on the bottom, the condenser circulates without stagnation in the condenser, the refrigerating machine oil flowing out from the condenser circulates due to the gravity of the downward pipe portion, and the upward pipe portion becomes thin. Then, it circulates together with the refrigerant whose flow rate has been increased and flows into the evaporator. Like the condenser, the refrigerating machine oil flowing into the evaporator has an inlet on the upper side and an outlet on the lower side. Therefore, the refrigerating machine oil flows out from the evaporator without stagnation and surely returns to the compressor provided below the evaporator. By configuring 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. Also, this time, the effect of mineral oil type is described, but the same effect can be obtained with synthetic oil type which has low compatibility with 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 sectional view of an air conditioner according to second and third embodiments of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 2 Compressor 3 Evaporator 4 Condenser 5 Throttling device 6 Blower

Claims (3)

[Claims] 1. A compressor, an evaporator, a condenser, a throttle device, and a blower, which uses a single or mixed HFC refrigerant as a refrigerant, and has low compatibility with refrigerant in refrigerating machine oil of the compressor. An air conditioner in which refrigerating machine oil is used, the evaporator and the condenser are arranged above the compressor, and an upper portion of each of the evaporator and the condenser is an inlet and a lower portion is an outlet. 2. A compressor, an evaporator, a condenser, a throttle device, and a blower, which uses a single or mixed HFC refrigerant as a refrigerant, and has low compatibility with refrigerant in refrigerating machine oil of the compressor. An air conditioner that uses refrigeration oil and has thin pipes for the upward flow of refrigerant and thick pipes for the downward flow of refrigerant. 3. A compressor, an evaporator, a condenser, a throttling device and a blower, wherein a single or mixed HFC refrigerant is used as a refrigerant, and refrigerating machine oil of the compressor has low compatibility with the refrigerant. Refrigerator oil is used, and an evaporator and a condenser arranged so that the upper part is the inlet and the lower part is the outlet are arranged above the compressor, and the pipe of the part in which the refrigerant flows upward is thin, and the refrigerant flows downward. An air conditioner with thick piping in the flowing part.