JP2867880B2 - Air conditioner - Google Patents

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.
A variety of refrigerating machine oils, such as mineral oil having high compatibility with CFC-based or HCFC-based refrigerants, are used as refrigerating machine oils for compressors.
However, these refrigerants will be completely eliminated in the near future due to the problem of destruction of the ozone layer.

[0003] In recent years, HFC-based single or mixed refrigerants have been considered as alternatives to these refrigerants, and glycol compounds, ester compounds, and the like have been proposed as compressor refrigerating machine oil (US Pat. No. 4,755,316). All of them aim to completely dissolve the HFC-based refrigerant and the refrigerating machine oil, thereby ensuring oil return.

FIG. 5 is a sectional view of an air conditioner using the HCFC 22, in which 21 is an air conditioner main body, 22 is a compressor, and 23 is a compressor.
Is an evaporator, 24 is a condenser, 25 is a squeezing device, 26 is a blower, 27 is a water pan for storing condensed water, 28 is a drain port,
29 is a drainage 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 and the like is slightly discharged together with the refrigerant. However, since the compatibility with the refrigerant is very high, the condenser 2
4. Return to the compressor 22 through the expansion device 25 and the evaporator 23.

[0005]

However, refrigerating machine oils of glycol compounds or ester compounds have insufficient abrasion resistance and low electrical resistivity as compared with conventional mineral oils. In addition, it has high hygroscopicity, and there are many issues in production such as moisture management in the assembly of air conditioners as well as moisture management of compressor components and finished products. There were problems such as accelerating mechanical wear of the machine, and clogging of the expansion device by these impurities to cause poor cooling.

The present invention solves the above-mentioned problems, and uses a mineral oil or synthetic oil which is not completely compatible with a refrigerant but has excellent electric insulation and hygroscopicity as a refrigerating machine oil. By configuring a refrigeration system in which the discharged refrigeration oil returns to the compressor without stagnation during the refrigeration cycle, a highly reliable air conditioner can be realized.

[0007]

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

Further, the present invention provides a horizontal compressor, an evaporator,
It has a condenser, a throttle device, and a blower.
Using a single or mixed refrigerant of the system, using a refrigerating machine oil having low compatibility with the refrigerant for the refrigerating machine oil of the horizontal compressor,
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 the discharge pipe and the suction pipe are directly connected to the horizontal compressor. A corrugated pipe is used, and a portion in which the refrigerant flows upward uses thin piping, and a portion in which the refrigerant flows downward uses thick piping.

[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, uses a single or mixed HFC-based refrigerant as a refrigerant, and uses the refrigerant oil of the horizontal compressor as the refrigerant. Using a refrigerating machine oil having low compatibility with the refrigerant, an evaporator and a condenser configured so that an upper portion is an inlet and a lower portion is an outlet are arranged above the horizontal compressor, and the horizontal compressor is used. Refrigerant oil discharged from the compressor by using helical piping as the discharge pipe and suction pipe directly connected to the machine, using thin piping for the part where the refrigerant flows upward and thick piping for the part where the refrigerant flows downward Return to the compressor without stagnation during the refrigeration cycle.

[0011] Further, it has a horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, and uses an HFC-based single or mixed refrigerant as a refrigerant, and converts the refrigerant into a refrigerating machine oil of the horizontal compressor. Using a refrigerating machine oil having a low compatibility with the refrigerant, an evaporator and a condenser configured so that the upper portion is an inlet and the lower portion is an outlet above the horizontal compressor,
The discharge pipe directly connected to the horizontal compressor, a corrugated pipe is used as a suction pipe, a part where the refrigerant flows upward is a thin pipe, and a part where the refrigerant flows downward is a thick pipe. The discharged refrigerating machine oil reliably returns to the compressor without stagnation during the refrigerating 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 cross-sectional view of the air conditioner,
FIG. 2 is a side view of only the compressor and piping connected thereto. In FIG. 1, a horizontal compressor 2, an evaporator 3, a condenser 4, a throttle device 5, and a blower 6 which constitute a refrigeration cycle are provided inside an air conditioner main body 1. Has a water receiving tray 7 for receiving condensed water, and the condensed water is stored in a drain tank 8 through a drain port. The air is sucked from the suction grill 9, passes through the evaporator 3 and the condenser 4, and is blown out from the outlet 10. The conventional refrigerant CFC1 is used as the refrigerating machine oil of the horizontal compressor 2.
2 or HCFC22 uses mineral oil that has a proven track record. 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 through an inlet 11 through an inlet 12. In the condenser 4, it is configured to exit from the refrigerant inlet 13 through the inlet / outlet 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. Further, the discharge pipe 15 that exits from the horizontal compressor 2 is formed as a spiral pipe in order to absorb vibration and prevent stagnation of refrigerating machine oil. The suction pipe 16 entering the horizontal compressor 2 also has a spiral pipe like the discharge pipe 15. By arranging the condenser 4 above the horizontal compressor 2, the amount of refrigerating machine oil discharged to the condenser 4 can be reduced, and a small amount of refrigerating machine oil discharged together with the refrigerant is supplied to the inlet of the condenser 4. The upper part and the lower part of the outlet make the condenser 4
The refrigerating machine oil discharged from the condenser 4 circulates without stagnation, the downward pipe portion circulates by gravity, and the upward portion circulates with the refrigerant having a thinner pipe and a higher flow rate, and flows into the evaporator 3. . The refrigerating machine oil that has flowed into the evaporator 3 is turned into an evaporator 3 by setting the inlet of the evaporator 3 to the upper part and the outlet to the lower part.
Without stagnation, passes through the helical piping to the horizontal compressor 2 provided below the evaporator 3 and reliably returns without stagnation on the way.

Next, a second embodiment will be described with reference to FIGS. FIG. 3 is a sectional view of the air conditioner, and FIG.
FIG. 2 is a side view of only the compressor and piping connected thereto.
In FIG. 3, a horizontal compressor 2, an evaporator 3, a condenser 4, a throttle device 5, and a blower 6 constituting a refrigeration cycle are provided inside the air conditioner main body 1. Has a water receiving tray 7 for receiving condensed water, and the condensed water is stored in a drain tank 8 through a drain port. The air is sucked from the suction grill 9, passes through the evaporator 3 and the condenser 4, and is blown out from the outlet 10. As the refrigerating machine oil of the horizontal compressor 2, a mineral oil which has been used in the conventional refrigerant CFC12 or 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. In the evaporator 3, the refrigerant flows from an inlet 11 to an inlet 12. The condenser 4 is configured to exit from the refrigerant inlet 13 through the inlet / outlet section 14. 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 part where the refrigerant flows upward are the pipes 20 of the part where the refrigerant flows downward.
It is configured to be thinner. The discharge pipe 19 which exits from the horizontal compressor 2 has a corrugated pipe in order to absorb vibration and prevent stagnation of refrigerating machine oil. The suction pipe 20 entering the horizontal compressor 2 is also connected to the discharge pipe 19.
It has a corrugated pipe as well. By arranging the condenser 4 above the horizontal compressor 2, 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 is supplied to the condenser 4. By setting the inlet to the upper part and the outlet to the lower part, the refrigerant circulates without stagnation in the condenser 4. The refrigerating machine oil flowing out of the condenser 4 circulates in the downward piping by gravity, and in the upward part, the piping becomes thinner and the flow rate decreases. Circulates together with the raised refrigerant and flows into the evaporator 3. Evaporator 3
The refrigerating machine oil flowing into the evaporator 3 has an inlet of the evaporator 3 at an upper portion and an outlet of the evaporator 3 at a lower portion, so that the evaporator 3 does not stay in the
It passes through the corrugated pipe to the horizontal compressor 2 provided below the evaporator 3 and reliably returns without stagnation on the way.

[0014]

As can be seen from the above description, the present invention has a horizontal compressor, an evaporator, a condenser, a throttling device and a blower, and uses a single or mixed HFC-based refrigerant as a refrigerant. Low compatibility with refrigerant in refrigerating machine oil for horizontal compressors, but proven in CFC12 or HCFC22,
Use mineral oil, which has higher compatibility with HFC-based refrigerants and higher abrasion resistance, better electrical insulation and less hygroscopicity than glycerol or ester compound-based refrigerating machine oil, and is easy to use. An evaporator and a condenser configured so that each has an inlet at the upper part and an outlet at the lower part are arranged, and a discharge pipe connected directly to the horizontal compressor and a spiral pipe as a suction pipe are used as refrigerants. By using thin piping for the part where upward flows and thick piping for the part where the refrigerant flows downward, the amount of refrigerant oil discharged to the condenser can be reduced, and a small amount of refrigerant oil discharged from the compressor together with the refrigerant In the condenser, the inlet is up and the outlet is down, so it circulates without stagnation on the way, and the refrigerating machine oil coming out of the condenser circulates by gravity in the downward piping section and narrows the piping in the upward section. It circulated together with the refrigerant raising the flow rate, and flows into the evaporator. The refrigerating machine oil that has flowed into the evaporator is located at a lower part of the evaporator at a position below the evaporator without stagnation in the evaporator because the inlet is upward and the outlet is downward.
It returns reliably without stagnation on the way through the spiral pipe. By configuring such a system, it is possible to solve problems such as moisture control in the manufacturing process, and to use not only the same manufacturing equipment as before, but also to improve the reliability of the system. In addition, this time, the effect in the mineral oil system is described, but the same effect is also obtained in the synthetic oil system having low compatibility with the HFC-based refrigerant.

[0015] Furthermore, it has a horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, and uses an HFC-based single or mixed refrigerant as a refrigerant. It has low compatibility with refrigerants but has a good track record with CFC12 or HCFC22, and is more abrasion-resistant, more electrically insulating and less hygroscopic than glycol-based or ester-based refrigeration oils that are more compatible with HFC-based refrigerants. Using a good mineral oil, an evaporator and a condenser are arranged above the horizontal compressor, each having an upper portion as an inlet and a lower portion as an outlet, and are directly connected to the horizontal compressor. By using corrugated pipes for the discharge pipe and the suction pipe, thin pipes are used for the part where the refrigerant flows upward, and thick pipes are used for the part where the refrigerant flows downward, so that the refrigerating machine oil is discharged to the condenser. A small amount of refrigerating machine oil that can be reduced and 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. The pipe part circulates by gravity, and the upward part circulates together with the refrigerant whose flow rate has been increased by making the pipe thinner, and flows into the evaporator. The refrigerating machine oil that has flowed into the evaporator passes through the corrugated pipe to the horizontal compressor installed below the evaporator without stagnation on the way because the inlet is up and the outlet is down on the evaporator, and stagnates on the way Return without fail. By configuring such a system, it is possible to solve problems such as moisture control in the manufacturing process, and to use not only the same manufacturing equipment as before, but also to improve the reliability of the system. In addition, this time, the effect in the mineral oil system is described, but the same effect is also obtained in the synthetic oil system having low compatibility with the HFC-based refrigerant.

[Brief description of the 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 a compressor and piping according to 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.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

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

Continuation of the front page (56) References JP-A-5-157379 (JP, A) JP-A 62-192188 (JP, U) JP-A 60-7532 (JP, U) JP-A 4-50368 (JP , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 41/00 F24F 1/02 F25B 1/00

Claims (2)

(57) [Claims] 1. A horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, wherein a single or mixed HFC-based refrigerant is used as a refrigerant, and the refrigerant is used as a refrigerant in the refrigerating machine oil of the horizontal compressor. Using a refrigerating machine oil having a low compatibility with the evaporator and a condenser configured so that an upper portion is an inlet and a lower portion is an outlet above the horizontal compressor, An air conditioner that uses helical pipes as the discharge pipe and suction pipe that are directly connected to the air conditioner, the pipes where the refrigerant flows upward are thin, and the pipes where the refrigerant flows downward are thick. 2. It has a horizontal compressor, an evaporator, a condenser, a throttle device, and a blower, and uses a single or mixed HFC-based refrigerant as a refrigerant. Using a refrigerating machine oil having a low compatibility with the evaporator and a condenser configured so that an upper portion is an inlet and a lower portion is an outlet above the horizontal compressor, An air conditioner that uses corrugated piping as a discharge pipe and a suction pipe that is directly connected to the air conditioner, and has a narrow pipe where a refrigerant flows upward and a thick pipe where a refrigerant flows downward.