JPH11118272A - Refrigeration cycle unit employing inflammable refrigerant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the quantity of lubricant being encapsulated in a compressor and the quantity of refrigerant being dissolved into the lubricant by employing an inflammable coolant and a high pressure compressor which delivers the coolant temporarily into the shell and then delivers the refrigerant from a coolant delivery tube provided for the shell. SOLUTION: Delivered from a compressor is supplied through a condenser, a restrictor, or the like, to an evaporator where heat is absorbed from the refrigerant and only gas refrigerant is sucked through an accumulator into the compressor. In such a refrigeration cycle, an HC based inflammable refrigerant principally comprising propane and isobutane is employed. Furthermore, a vertical high pressure compressor comprises a compression mechanism section 40 disposed under a substantially tubular shell 30 and a motor mechanism section 50 disposed above the shell 30 is employed. A refrigerant delivery tube 31 is disposed at the upper part of the shell 30 and an oil separation mechanism 80 is provided above the motor mechanism section 50. Furthermore, an oil reservoir 60 is provided under the compression mechanism section 40 and a delivery port 46 is provided above the compression mechanism section 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle apparatus using a flammable refrigerant as a refrigerant, and more particularly to a refrigeration cycle apparatus using an HC-based refrigerant such as propane or isobutane as a refrigerant among flammable refrigerants.

[0002]

2. Description of the Related Art It is said that an HCFC-based refrigerant represented by R22 currently used in a refrigeration cycle apparatus destroys an ozone layer due to the stability of its physical properties. In recent years, HFC-based refrigerants have begun to be used as alternative refrigerants to HCFC-based refrigerants, and these HFC-based refrigerants have a property of promoting a warming phenomenon. Therefore, recently, the use of an HC-based refrigerant that does not significantly affect the destruction of the ozone layer and the global warming phenomenon has begun to be studied. However, this HC
Since the system refrigerant is a flammable refrigerant, it is necessary to prevent explosion and ignition beforehand and to ensure safety. As a method of preventing explosion or ignition when using an HC-based refrigerant, it has been proposed to eliminate, isolate, or keep away the ignition source (for example, JP-A-7-55267, JP-A-8-85287). -61702). On the other hand, as another method of preventing explosion or ignition when using an HC-based refrigerant, a method of making the refrigerant itself nonflammable (Japanese Patent Laid-Open No. 9-5960).
No. 9) and a method for reducing the amount of refrigerant to be used (Japanese Patent Application Laid-Open Nos. 8-170859 and 8-170860) have been proposed. Here, the prior art about the method of reducing the amount of refrigerant to be used (Japanese Patent Application Laid-Open Nos. 8-170859 and 8-170860) will be described in more detail. Japanese Unexamined Patent Application Publication Nos. Hei 8-170589 and Hei 8-170860 relate to refrigerators, but in order to reduce the amount of refrigerant used, a dew-proof pipe is provided separately from the refrigeration cycle, The non-combustible refrigerant is used for the dew-proof pipe, and the refrigerant pipe for heat exchange in the refrigerator is provided separately from the refrigerant pipe of the evaporator, and the refrigerant pipe for heat exchange in the refrigerator uses an incombustible refrigerant. It is proposed to change the number of passes between the upstream side and the downstream side of the condenser.

[0003]

First, a method of preventing explosion or ignition by eliminating, isolating, or keeping away the ignition source is very effective when considering the refrigeration cycle apparatus alone. Many refrigeration cycle devices such as air conditioners, refrigerators, and dehumidifiers are used in a sealed room, and it cannot be said that there is no ignition source from other devices in this room. Therefore, although the safety of the refrigeration cycle device can be improved, it cannot be said that the safety is necessarily ensured depending on the use condition.
In addition, a method of preventing explosion or ignition by making the refrigerant itself nonflammable does not have the above-described problem and can be said to be safe in any use state. But,
It is not easy to make flammable refrigerants non-flammable under the constraints that they do not adversely affect the global environment, such as depletion of the ozone layer and global warming, and that a certain level of refrigeration capacity must be obtained. . On the other hand, as for the method of reducing the amount of the refrigerant to be used, the flammable refrigerant does not ignite or explode unless it reaches a certain concentration in the air.
By reducing the amount of the enclosed refrigerant, ignition and explosion can be prevented beforehand, and danger establishment can be greatly reduced. By the way, the flammable refrigerant is very soluble in the lubricating oil of the compressor. The refrigerant dissolved in the lubricating oil is not conveyed to the heat exchanger and can be said to be a useless refrigerant that does not exchange heat.

Accordingly, the present invention is to reduce the amount of the lubricating oil dissolved in the lubricating oil by reducing the amount of the lubricating oil discharged from the compressor during the refrigeration cycle to reduce the volume of the lubricating oil sealed in the compressor. It is an object of the present invention to prevent the risk of ignition or explosion at the time of refrigerant leakage by reducing the amount of refrigerant enclosed in the refrigeration cycle.

[0005]

According to a first aspect of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the present invention, wherein a compressor, a condenser, a throttle device, and an evaporator are connected in a ring through pipes. In the cycle device, a high-pressure type compressor that uses a flammable refrigerant as a refrigerant, discharges the refrigerant compressed by a compression mechanism once into a shell, and discharges the refrigerant from a refrigerant discharge pipe provided in the shell as the compressor. It is characterized by using a machine. A refrigeration cycle apparatus using a flammable refrigerant according to a second aspect of the present invention is the refrigeration cycle apparatus using a flammable refrigerant according to the first aspect, wherein the compressor includes the compression mechanism and the refrigerant discharge pipe. And a motor mechanism disposed between the two. According to a third aspect of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the second aspect, wherein the shell has a height dimension greater than a radial dimension. A large cylindrical shell having a compression mechanism at the lower part of the shell, a motor mechanism at the upper part, an oil reservoir at the lower part of the compression mechanism, and a discharge port for the compressed refrigerant at the upper part of the compression mechanism. It is characterized by being provided in. According to a fourth aspect of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the second aspect, wherein the compressor includes the motor mechanism and the refrigerant discharge pipe. And an oil separating mechanism is provided between them. A refrigeration cycle apparatus using a flammable refrigerant according to a fifth aspect of the present invention is the refrigeration cycle apparatus using a flammable refrigerant according to the second aspect, wherein the compressor comprises the motor mechanism and the refrigerant discharge pipe. An oil separation chamber is provided between
The height dimension of the oil separation chamber is larger than the inner diameter of the refrigerant discharge pipe. A refrigeration cycle apparatus using a flammable refrigerant according to a sixth aspect of the present invention is the refrigeration cycle apparatus using a flammable refrigerant according to any one of the first to fifth aspects, wherein the compressor and the condenser are provided. And a lubricating oil separated by the oil separator is returned into the compressor. A refrigeration cycle apparatus using a flammable refrigerant according to a seventh aspect of the present invention is the refrigeration cycle apparatus using a flammable refrigerant according to the sixth aspect, wherein an HC-based refrigerant is used as the flammable refrigerant. And

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigeration cycle apparatus using a flammable refrigerant according to a first embodiment of the present invention, as a compressor, temporarily discharges a refrigerant compressed by a compression mechanism into a shell. Using a high-pressure compressor that discharges a refrigerant from a refrigerant discharge pipe provided in the compressor. As described above, in the first embodiment of the present invention, by using the high-pressure compressor, the refrigerant containing the lubricating oil is once discharged into the shell and then discharged out of the shell. The lubricating oil is easily separated from the refrigerant, and the lubricating oil is less likely to be discharged outside the shell.

According to a second embodiment of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the first embodiment, wherein the compressor comprises a motor mechanism between a compression mechanism and a refrigerant discharge pipe. Is arranged. As described above, according to the second embodiment of the present invention, the motor mechanism disposed between the compression mechanism and the refrigerant discharge pipe can lengthen the passage until the refrigerant is discharged out of the shell. The flow velocity can be changed before and after the passage through the mechanism, and an obstacle for promoting the lubricating oil separating action can be configured. Therefore, the lubricating oil is more easily separated from the refrigerant in the shell,
Lubricating oil is less likely to be discharged outside the shell.

According to a third embodiment of the present invention, there is provided a refrigeration cycle apparatus using a combustible refrigerant according to the second embodiment, wherein the shell has a cylindrical shape having a height dimension larger than a radial dimension. A shell is provided, a compression mechanism is provided below the shell, a motor mechanism is provided above, an oil reservoir is provided below the compression mechanism, and a discharge port for compressed refrigerant is provided above the compression mechanism. As described above, in the third embodiment of the present invention, in order to use a cylindrical shell having a dimension in the height direction larger than the dimension in the radial direction, the lubricating oil is stored in the lower portion inside the shell, and When arranging the compression mechanism, the space as the oil reservoir formed at the lower part of the shell becomes narrower,
Even if the amount of lubricating oil is small, the depth of lubricating oil can be ensured. That is, the lubricating oil level can be increased even with a small amount of lubricating oil due to the presence of the compression mechanism. Therefore, even if the lubricating oil slightly jumps out of the shell together with the refrigerant, the lubricating oil surface does not easily fall below the oil pump inlet, and the reliability due to insufficient lubricating oil is hardly affected. Further, by providing the refrigerant discharge pipe at the upper part of the shell, the discharge of lubricating oil to the outside of the shell can be reduced. Therefore, since it is not necessary to enclose extra lubricating oil in anticipation of lubricating oil flowing out of the shell, the amount of lubricating oil enclosed in the shell can be reduced.

According to a fourth embodiment of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the second embodiment, wherein the compressor comprises an oil separation mechanism between a motor mechanism and a refrigerant discharge pipe. Part is provided. As described above, in the fourth embodiment of the present invention, the lubricating oil is separated from the refrigerant before being discharged from the refrigerant discharge pipe by providing the oil separation mechanism between the motor mechanism and the refrigerant discharge pipe. can do. Therefore, since the discharge of the lubricating oil to the outside of the shell can be reduced, it is not necessary to additionally enclose the lubricating oil in anticipation of the lubricating oil flowing out of the shell.

According to a fifth embodiment of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the fourth embodiment, wherein the compressor comprises an oil separator between a motor mechanism and the refrigerant discharge pipe. A chamber is provided, and the dimension in the height direction of the oil separation chamber is larger than the inner diameter of the refrigerant discharge pipe. As described above, in the fifth embodiment of the present invention, since the flow rate of the refrigerant can be reduced by providing the oil separation chamber between the motor mechanism and the refrigerant discharge pipe, the oil is separated from the refrigerant discharge pipe. In addition, the lubricating oil can be separated from the refrigerant. Therefore, since the discharge of the lubricating oil to the outside of the shell can be reduced, it is not necessary to additionally enclose the lubricating oil in anticipation of the lubricating oil flowing out of the shell.

According to a sixth embodiment of the present invention, there is provided a refrigeration cycle apparatus using a flammable refrigerant according to the first to fifth embodiments, wherein an oil separator is connected between the compressor and the condenser. The lubricating oil separated by the oil separator is returned into the compressor. As described above, according to the sixth embodiment of the present invention, by connecting the oil separator between the compressor and the condenser, even if the lubricating oil is discharged from the refrigerant discharge pipe, the lubrication from the refrigerant is performed by the oil separator. The oil can be separated and returned to the compressor. Therefore, since the discharge of the lubricating oil into the refrigeration cycle can be reduced, it is not necessary to additionally enclose the lubricating oil in anticipation of the lubricating oil flowing out during the refrigeration cycle.

A seventh embodiment of the present invention is a refrigeration cycle apparatus using a flammable refrigerant according to the sixth embodiment, wherein an HC-based refrigerant is used as the flammable refrigerant. As described above, in the seventh embodiment of the present invention, by using a highly flammable refrigerant, the effect of reducing the amount of charged refrigerant is higher.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigeration cycle apparatus using an HC refrigerant according to one embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 4 is a refrigeration cycle diagram for explaining the embodiment.
As shown in the figure, a compressor 1, an oil separator 2, a condenser 3, a throttle device 4, an evaporator 5, and an accumulator 6 are connected in a ring shape through respective pipes. Here, the lubricating oil separated by the oil separator 2 is connected by piping so as to be returned into the compressor 1. The refrigerant used in the refrigeration cycle is an HC-based flammable refrigerant mainly containing propane, isobutane and the like. The refrigerant compressed by the compressor 1 is guided to the condenser 3 via the oil separator 2. Here, the lubricating oil contained in the discharged refrigerant is separated by the oil separator 2 and returned to the compressor 1. The refrigerant introduced into the condenser 3 is decompressed by the expansion device 4 after heat release, absorbs heat by the evaporator 5, and only the gas refrigerant is sucked into the compressor 1 via the accumulator 6.

Next, an embodiment of the oil separator 2 used in the refrigeration cycle will be described with reference to FIG. As shown in the figure, the oil separator 2 has a filter 2 inside.
And a suction port 2 connected to a discharge side pipe of the compressor 1
2, a discharge port 23 connected to the condenser 3 and an oil return port 24 for returning lubricating oil separated to the compressor 1
5 The suction port 22 is provided on a side of the main body 25, and the discharge port 23 is provided on an upper part of the main body 25. Here, the filter 21 is provided in a space between the suction port 22 and the discharge port 23. On the other hand, the oil return port 24 is provided at the bottom of the main body 25. With the above configuration, the refrigerant introduced into the main body 25 from the suction port 22 passes through the filter 21 and is discharged from the discharge port 23. At this time, the lubricating oil is separated from the refrigerant by the filter 21, It falls to the lower part of the main body 25. The separated lubricating oil is guided from the oil return port 24 to the compressor 1. By providing the oil separator 2 in the pipe on the discharge side of the compressor 1 in this manner, the condenser 3, the throttle device 4, and the evaporator 5
And the like, it is possible to prevent the lubricating oil from flowing into the refrigeration cycle. In the present embodiment, the amount of the lubricating oil discharged into the refrigeration cycle is reduced, thereby reducing the amount of the sealed oil and consequently the amount of the refrigerant dissolved in the lubricating oil. Note that the oil separator 2 described in the above embodiment is not necessarily provided in the refrigeration cycle.
Further, the configuration of the oil separator 2 is not necessarily limited to the configuration described in the above embodiment, and an oil separator having another configuration may be used.

An embodiment of the compressor used in the present invention will be described below. FIG. 3 is a sectional view of the compressor according to the first embodiment. The compressor shown in FIG. 1 is a vertical high-pressure compressor in which a compression mechanism 40 is provided below a substantially cylindrical shell 30 and a motor mechanism 50 is provided above. First, the shell 30 has a cylindrical shape whose dimension in the height direction is larger than the dimension in the radial direction, and a refrigerant discharge pipe 31 is provided at the upper part. The compression mechanism 40 includes a piston 41, a cylinder 4
2, having an upper bearing 43, a lower bearing 44, etc.
A connection pipe from the accumulator 6 is provided at the suction port 45 into the inside 2. The discharge port 46 of the compression mechanism 40 is provided in the upper bearing 43. The motor mechanism 50 includes a stator 51, a rotor 52, and the like. The rotor 52 and the piston 41 are connected to a crankshaft 53
Are linked by An oil reservoir 60 is formed at the bottom of the shell 30. Here, the lubricating oil is sealed so that the lubricating oil level is higher than the upper surface of the cylinder 42. The crankshaft 53 has an upper bearing 43, a piston 41, a lower bearing 4
4 is formed with an oil supply pump for supplying lubricating oil. On the other hand, above the motor mechanism 50, an oil separation chamber 70 is formed. The oil separation chamber 70 is a space sufficient for reducing the flow rate of the refrigerant gas before the refrigerant gas passing around the motor mechanism 50 is guided to the refrigerant discharge pipe 31. More specifically, the dimension in the height direction of the oil separation chamber 70 is larger than the dimension of the inner diameter of the refrigerant discharge pipe 31. The oil separation chamber 70 is provided with an oil separation mechanism 80. The oil separating mechanism 80 is provided with an oil separating plate that is connected to the crankshaft 53 and rotates so as to face the opening of the refrigerant discharge pipe 31. There is a gap through which the refrigerant gas passes between the stator 51 of the motor mechanism 50 and the shell 30, and a coolant passage 90 is formed in addition to this gap. This refrigerant passage 90 has a passage cross section sufficient to reduce the flow velocity of the passing refrigerant gas. That is, the refrigerant passage 90 has a passage cross section such that the lubricating oil does not rise along the inner surface of the passage as the refrigerant gas rises.

The flow of the refrigerant gas and the lubricating oil of the compressor will be described below. First, the refrigerant sucked into the cylinder 42 from the accumulator 6 through the suction port 45 is compressed with the rotation of the piston 41, and the compressed high-pressure refrigerant gas is discharged from the discharge port 46 into the shell 30. . Then, the refrigerant reaches the oil separation chamber 70 through the gap between the stator 51 and the shell 30 and the refrigerant passage 90, and is discharged from the refrigerant discharge pipe 31 to the outside of the shell 30. On the other hand, the lubricating oil stored in the oil storage section 60 is pumped up by an oil pump formed below the crankshaft 53 and supplied to the sliding surfaces of the upper bearing 43, the piston 41, and the lower bearing 44. Then, the lubricating oil supplied into the compression chamber is discharged from the discharge port 46 into the shell 30 together with the refrigerant, and moves similarly to the flow of the refrigerant gas. However, a part of the lubricating oil discharged together with the refrigerant is
When passing through, the refrigerant is separated from the refrigerant and falls to the compression mechanism 40. A part of the lubricating oil that has passed through the motor mechanism 50 together with the refrigerant gas is separated from the refrigerant in the oil separation chamber 70, and another part is separated from the refrigerant by the oil separation mechanism 80. Fall to 50. As described above, since the compression mechanism 40 is arranged below the shell 30, the space as the oil reservoir 60 formed below the shell 30 is narrowed, and the compression mechanism 40 is reduced with a small amount of lubricating oil. Can be satisfied. That is, due to the presence of the compression mechanism 40, the lubricating oil level can be increased even with a small amount of lubricating oil. Therefore, even if the lubricating oil slightly jumps out of the shell 30 together with the refrigerant, the lubricating oil surface is unlikely to be lower than the oil pump inlet formed at the lower portion of the crankshaft 53, which affects reliability due to insufficient lubricating oil. There are few things.

FIG. 4 is a sectional view of a compressor according to a second embodiment. Note that members having the same functions as those of the already described embodiment are given the same reference numerals and description thereof is omitted. The same applies to the following embodiments. Similarly to the first embodiment, the compressor shown in the figure is a vertical high-pressure compressor in which a compression mechanism 40 is provided below a substantially cylindrical shell 30 and a motor mechanism 50 is provided above. However, this second embodiment is a scroll type compressor, and has two scroll wraps 4.
7, 48, Oldham ring 49, etc.
0. The discharge port 46 of the compression mechanism 40 is provided with a fixed scroll wrap 48,
Is provided on the lower surface. The oil sump 60 includes the compression mechanism 4
0 and the motor mechanism 50. An oil supply groove for supplying lubricating oil from the oil reservoir 60 to the scroll wraps 47 and 48 is formed in the crankshaft 53 and the Oldham ring 49. Also in the present embodiment, between the stator 51 of the motor mechanism 50 and the shell 30, a gap through which the coolant gas passes and a coolant passage 90 other than this gap are formed. In the present embodiment, the compression mechanism 40 has a refrigerant communication hole 91 that communicates a space below the compression mechanism 40 with a space above the compression mechanism 40.

The flow of the refrigerant gas and the lubricating oil of the compressor will be described below. First, the refrigerant drawn into the scroll wraps 47 and 48 from the accumulator via the suction port 45 is compressed by the orbital movement of the movable scroll wrap 47, and the compressed high-pressure refrigerant gas is compressed from the discharge port 46. The liquid is discharged into a space below the mechanism section 40. The refrigerant discharged into the lower space is guided to the space above the compression mechanism 40 through the refrigerant communication hole 91, and the gap between the stator 51 and the shell 30 and the refrigerant passage 9 are formed.
Then, the refrigerant reaches the oil separation chamber 70 through the coolant discharge pipe 31 and is discharged from the refrigerant discharge pipe 31 to the outside of the shell 30. On the other hand, the lubricating oil stored in the oil storage section 60 is supplied to the sliding surfaces of the scroll wraps 47 and 48 and the Oldham ring 49 by oil supply grooves formed in the crankshaft 53 and the Oldham ring 49 and the like. Then, the lubricating oil supplied into the compression chamber is discharged from the discharge port 46 into the shell 30 together with the refrigerant, and moves similarly to the flow of the refrigerant gas. However, a part of the lubricating oil discharged together with the refrigerant separates from the refrigerant when passing through the motor mechanism 50. Further, part of the lubricating oil that has passed through the motor mechanism 50 together with the refrigerant gas is supplied to the oil separation chamber 7.
At 0, it is separated from the refrigerant. Then, the lubricating oil separated from the refrigerant in this manner falls to the oil reservoir 60. As described above, since the oil reservoir 60 is disposed above the compression mechanism 40 that requires lubrication, the lubricant can always be supplied to the compression mechanism 40 even with a small amount of lubricant. Therefore, even if the lubricating oil slightly jumps out of the shell 30 together with the refrigerant, there is little effect on the reliability due to insufficient lubricating oil.

FIG. 5 is a sectional view of a compressor according to a third embodiment. The compressor shown in FIG.
Two scroll wraps 47 and 48, Oldham ring 4
9 is a scroll type compressor in which a compression mechanism section 40 is constituted by 9 or the like. However, unlike the first and second embodiments, the third embodiment is a horizontal high-pressure compressor in which a compression mechanism 40, a motor mechanism 50, and a pump 65 are sequentially arranged in the horizontal direction. is there. The discharge port 46 of the compression mechanism 40
Is provided on the fixed scroll wrap 48. The oil reservoir 60 is provided below the shell 30 on the motor mechanism 50 side of the compression mechanism 40. An oil partition 66 is provided between the motor mechanism 50 and the pump 65. The crankshaft 53 and the Oldham ring 49 are provided with oil supply grooves for supplying the lubricating oil pumped from the oil reservoir 60 by the pump unit 65 to the scroll wraps 47 and 48. Also in the present embodiment, a gap through which the refrigerant gas passes is formed between the stator 51 of the motor mechanism 50 and the shell 30. Further, a refrigerant communication hole 91 is formed in the compression mechanism 40 to communicate a space on the discharge port 46 side of the compression mechanism 40 with a space on the motor mechanism 50 side. The refrigerant discharge pipe 31 is provided closer to the pump section 65 than the oil partition section 66 is.

The flow of the refrigerant gas and the lubricating oil of the compressor will be described below. First, the refrigerant drawn into the scroll wraps 47 and 48 from the accumulator via the suction port 45 is compressed by the orbital movement of the movable scroll wrap 47, and the compressed high-pressure refrigerant gas is compressed from the discharge port 46. The liquid is discharged into the space on the discharge port 46 side of the mechanism section 40. Then, the refrigerant discharged into this space passes through the refrigerant communication hole 91, and the compression mechanism 40 and the motor mechanism 5
0, the stator 51 and the shell 30
Through the oil partition, reaches the oil separation chamber 70, and is discharged from the refrigerant discharge pipe 31 to the outside of the shell 30. On the other hand, the lubricating oil stored in the oil storage section 60 is pumped up by the pump section 65 and
The scroll wraps 47 and 48 and the Oldham ring 49 are provided by oil supply grooves formed in the 3 and Oldham ring 49 and the like.
Is supplied to the sliding surface. Then, the lubricating oil supplied into the compression chamber is discharged from the discharge port 46 into the shell 30 together with the refrigerant, and moves similarly to the flow of the refrigerant gas. However, a part of the lubricating oil discharged together with the refrigerant separates from the refrigerant when passing through the motor mechanism 50. A part of the lubricating oil that has passed through the motor mechanism 50 together with the refrigerant gas is:
The oil is separated from the refrigerant in the oil separation chamber 70. Then, the lubricating oil separated from the refrigerant in this manner falls to the oil reservoir 60. Although many lubricating oils are guided toward the pump section 65 by the flow of the refrigerant, since the oil partitioning section 66 is provided, a large amount of the lubricating oil is stored in the oil reservoir 60 in the oil separation chamber 70. become. As described above, most lubricating oil separated in the oil separation chamber 70 is supplied to the oil partition 66
The lubricating oil can be effectively used because the oil accumulates in the oil sump 60 in the oil separation chamber 70 partitioned by the above. Further, by reducing the amount of the lubricating oil flowing out of the shell 30, the lubricating oil can be effectively used. In this embodiment, the oil partition 66 is provided between the motor mechanism 50 and the pump 65. However, the oil partition may be formed by the motor mechanism 50. In this embodiment, an oil partition 66 is provided, and a large amount of lubricating oil is stored in the pump 65 using the flow of the refrigerant.
By disposing the compressor so that the pump section 65 is at a lower position than the compression mechanism section 40 without providing the
A large amount of lubricating oil can be stored on the side.

FIG. 6 is a sectional view of a compressor according to a fourth embodiment. The compressor shown in the figure is a vertical intermediate-pressure compressor in which two compression mechanisms 40A and 40B are provided below a substantially cylindrical shell 30 and a motor mechanism 50 is provided above. The two compression mechanisms 40A and 40B have pistons 41A and 41B and cylinders 42A and 42B, respectively, and one compression mechanism 40A has a suction port 45A into the cylinder 42A. Is provided with a connection pipe from the accumulator 6.
The discharge port 46 of the compression mechanism 40A is provided in the lower bearing 44. On the other hand, the compression mechanism 40B has a suction port 45B into the cylinder 42B in the upper bearing 43, and the discharge port 46B of the compression mechanism 40B has a refrigerant discharge pipe 31B.
Is provided. The rotor 52 and the piston 41A and the piston 41B are connected by a crankshaft 53. The oil reservoir 6 is provided at the bottom of the shell 30.
0 is formed. The crankshaft 53 has
An oil supply pump for supplying lubricating oil from the oil reservoir 60 to the upper bearing 43, the piston 41, and the lower bearing 44 is formed.

The flow of the refrigerant gas and the lubricating oil of the compressor will be described below. First, the refrigerant sucked into the cylinder 42A from the accumulator 6 through the suction port 45 is compressed with the rotation of the piston 41A, and the compressed refrigerant gas is discharged from the discharge port 46 into the shell 30. The refrigerant gas discharged into the shell 30 is drawn into the cylinder 42B from the suction port 45B,
The compressed refrigerant gas is compressed along with the rotation of the piston 41B, and the compressed refrigerant gas is discharged out of the shell 30 through the discharge port 46B and the refrigerant discharge pipe 31. On the other hand, the lubricating oil stored in the oil reservoir 60 is pumped up by an oil pump formed below the crankshaft 53 and
3. It is supplied to the sliding surfaces of the pistons 41A and 41B and the lower bearing 44. Then, the lubricating oil supplied into the cylinder 42A is discharged into the shell 30 from the discharge port 46 together with the refrigerant. On the other hand, the lubricating oil supplied into the cylinder 42B is discharged out of the shell 30 from the discharge port 46B together with the refrigerant. In this embodiment, by setting the inside of the shell 30 to the intermediate pressure as described above, the amount of the refrigerant dissolved into the lubricating oil can be reduced as compared with the high-pressure type. Therefore, the amount of lubricating oil to be enclosed can be reduced.

[0023]

As described above, the present invention reduces the amount of lubricating oil discharged from the compressor during the refrigeration cycle,
The amount of lubricating oil to be enclosed can be reduced. Then, by reducing the amount of the refrigerant dissolved in the lubricating oil of the compressor, the refrigerant sealed in the refrigeration cycle can be effectively used. Therefore, the amount of refrigerant to be charged can be reduced,
Even if the refrigerant leaks, the probability that the mixing ratio with the atmosphere exceeds the ignition limit is reduced, and the danger of ignition and explosion can be prevented beforehand, and a safe refrigeration cycle device can be provided.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram according to one embodiment of the present invention.

FIG. 2 is a side sectional view of an oil separator according to an embodiment of the present invention.

FIG. 3 is a side sectional view of a compressor according to one embodiment of the present invention.

FIG. 4 is a side sectional view of a compressor according to another embodiment of the present invention.

FIG. 5 is a side sectional view of a compressor according to another embodiment of the present invention.

FIG. 6 is a side sectional view of a compressor according to another embodiment of the present invention.

[Description of Signs] 1 Compressor 3 Condenser 4 Throttling device 5 Evaporator 30 Shell 31 Refrigerant discharge pipe 40 Compression mechanism 46 Discharge port 50 Motor mechanism 60 Oil reservoir 65 Pump 66 Oil partition

Continued on the front page (72) Inventor Riko Shukue 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A refrigeration cycle device in which a compressor, a condenser, a throttle device, and an evaporator are connected in a ring via pipes, respectively, wherein a combustible refrigerant is used as a refrigerant, and the compressor is compressed by a compression mechanism. A refrigeration cycle apparatus using a flammable refrigerant, wherein a high-pressure compressor is used to discharge the refrigerant once into a shell and discharge the refrigerant from a refrigerant discharge pipe provided in the shell. 2. The refrigeration system using a flammable refrigerant according to claim 1, wherein the compressor has a motor mechanism disposed between the compression mechanism and the refrigerant discharge pipe. Cycle equipment. 3. The shell is a cylindrical shell having a dimension in a height direction larger than a dimension in a radial direction, a compression mechanism is provided at a lower part of the shell, and a motor mechanism is provided at an upper part, and a lower part of the compression mechanism is provided. 3. The refrigeration cycle apparatus using a flammable refrigerant according to claim 2, wherein an oil reservoir is provided at the upper portion, and a discharge port of the compressed refrigerant is provided at an upper portion of the compression mechanism. 4. The refrigeration cycle apparatus using a flammable refrigerant according to claim 2, wherein the compressor has an oil separation mechanism provided between the motor mechanism and the refrigerant discharge pipe. . 5. The compressor, wherein an oil separation chamber is provided between the motor mechanism and the refrigerant discharge pipe, and a height dimension of the oil separation chamber is larger than an inner diameter of the refrigerant discharge pipe. A refrigeration cycle apparatus using the flammable refrigerant according to claim 2, characterized in that: 6. The compressor according to claim 1, wherein an oil separator is connected between the compressor and the condenser, and lubricating oil separated by the oil separator is returned into the compressor. A refrigeration cycle apparatus using the flammable refrigerant according to any of the above items. 7. The refrigeration cycle apparatus using a flammable refrigerant according to claim 6, wherein an HC-based refrigerant is used as the flammable refrigerant.