CN114072583A

CN114072583A - Compressor and refrigerating device

Info

Publication number: CN114072583A
Application number: CN202080049262.0A
Authority: CN
Inventors: 外山俊之
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2019-07-11
Filing date: 2020-06-01
Publication date: 2022-02-18
Also published as: EP3971420A1; WO2021005918A1; EP3971420A4; US20220128280A1; JP2021014812A

Abstract

The compressor (1) is provided with a compression mechanism (15) housed in the interior of a housing (10), a frame (18) in which a crank chamber (19) is formed, and a 1 st oil return passage (31) which guides downward lubricating oil which flows into the crank chamber (19). An oil return guide (32) for causing the lubricating oil to contract is provided in the 1 st oil return passage (31). The upper part of the casing (10) forms an oil separation space (S2) for separating lubricating oil from the high-pressure refrigerant discharged from the compression mechanism (15). The compressor (1) further has a 2 nd oil return passage (33) for guiding the lubricating oil separated in the oil separation space (S2) downward. The outlet of the 2 nd oil return passage (33) is disposed in the vicinity of the outlet of the oil return guide (32).

Description

Compressor and refrigerating device

Technical Field

The invention relates to a compressor and a refrigeration device.

Background

In the compressor disclosed in patent document 1, the centrifugal force generated by the swirling flow separates a mist-like lubricating oil contained in the compressed refrigerant gas discharged to the top space (the space inside the casing located above the compression mechanism) from the refrigerant gas into a liquid state, thereby reducing oil discharge (zhi hei り).

In the structure of this conventional compressor, the static pressure in the head space is lower than the static pressure in the motor upper space (the space inside the casing into which the high-pressure refrigerant gas discharged downward from the compression mechanism flows). Therefore, the lubricating oil separated in the head space is returned from the head space to the oil reservoir at the bottom of the casing through the motor upper space by the negative pressure generated by the contraction flow of the refrigerant gas flowing from the compression mechanism into the motor upper space.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2011/093385

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional compressor disclosed in patent document 1, the lubricating oil that has not been easily separated from the refrigerant gas in the head space is caused to flow into the refrigerant gas again in the flow in the upper space of the motor. As a result, the oil discharge suppressing effect is limited to the separation amount of the lubricating oil by the swirling flow (swirling flow) in the head space.

The purpose of the present invention is to suppress oil discharge in a compressor having a head space as an oil separation space.

Means for solving the problems

A 1 st aspect of the present invention is a compressor including: a casing 10 for storing lubricating oil at the bottom; a compression mechanism 15 housed inside the casing 10; a frame 18 supporting the compression mechanism 15 and formed with a crank chamber 19; and a 1 st oil return passage 31 for guiding the lubricating oil flowing into the crank chamber 19 downward, wherein the 1 st oil return passage 31 is provided with an oil return guide 32 for causing the lubricating oil to contract, an upper portion of the casing 10 forms an oil separation space S2, the oil separation space S2 separates the lubricating oil from the high-pressure refrigerant discharged from the compression mechanism 15, the compressor further includes a 2 nd oil return passage 33, the 2 nd oil return passage 33 guides the lubricating oil separated in the oil separation space S2 downward, and an outlet of the 2 nd oil return passage 33 is disposed in the vicinity of an outlet of the oil return guide 32.

In the 1 st aspect, since the outlet of the 2 nd oil return passage 33 of the lubricating oil separated in the oil separation space S2 is disposed in the vicinity of the outlet of the oil return guide 32, the separated oil is guided downward by the 2 nd oil return passage 33 due to the negative pressure generated by the contraction flow of the lubricating oil, and the oil discharge can be suppressed.

In the compressor according to claim 2 of the present invention, in claim 1, the 2 nd oil return passage 33 is formed by a pipe 34 penetrating the frame 18.

In the 2 nd embodiment, the 2 nd oil return passage 33 can be simply configured.

A compressor according to claim 3 of the present invention is characterized in that, in the compressor according to claim 1 or 2, the compressor further includes an oil return plate 35, and the oil return plate 35 is disposed so as to surround at least a lower portion of each of the 2 nd oil return passage 33 and the oil return guide 32 between the oil return plate 35 and an inner wall surface of the casing 10.

In the 3 rd aspect, scattering of the lubricating oil fed from the respective outlets of the 2 nd oil return passage 33 and the oil return guide 32 can be suppressed.

A compressor according to claim 4 of the present invention is characterized in that, in claim 3, a space surrounded by the oil return plate 35 and an inner wall surface of the casing 10 is narrowed downward from the vicinity of an outlet of each of the 2 nd oil return passage 33 and the oil return guide 32.

In the 4 th aspect, the flow velocity of the lubricating oil increases as it travels downward, and therefore the lubricating oil can be efficiently guided downward.

A refrigeration apparatus according to claim 5 of the present invention is characterized by including any one of the compressors 1 of the 1 st to 4 th aspects.

In the 5 th aspect, since any one of the compressors 1 of the 1 st to 4 th aspects is provided, oil discharge can be further suppressed.

Drawings

Fig. 1 is a schematic diagram of a refrigerant circuit of a refrigeration apparatus including a compressor according to an embodiment.

Fig. 2 is a longitudinal sectional view of the compressor of the embodiment.

Fig. 3 is a detailed longitudinal sectional view of the upper portion of the compressor shown in fig. 2.

Fig. 4 (a) and (b) are perspective views of the oil return guide constituting the compressor shown in fig. 2, respectively, viewed from the drive shaft side and the casing side.

Fig. 5 (a) and (b) are perspective views of the oil return plate constituting the compressor shown in fig. 2, respectively, viewed from the drive shaft side and the casing side.

Fig. 6 is a perspective view of a compression mechanism, a frame, and their peripheries constituting the compressor shown in fig. 2 (before the 2 nd oil return passage is mounted).

Fig. 7 is a perspective view of a compression mechanism, a frame, and their peripheries constituting the compressor shown in fig. 2 (after the 2 nd oil return passage is installed).

Fig. 8 (a) and (b) are perspective views of modified examples of the internal refrigerant discharge pipe constituting the compressor shown in fig. 2, viewed from the drive shaft side and the casing side, respectively.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or its uses.

< construction of refrigerating apparatus >

Fig. 1 is a schematic diagram of a refrigerant circuit of a refrigeration apparatus 100 including a compressor 1 according to the present embodiment.

As shown in fig. 1, the refrigeration apparatus 100 includes a compressor 1, a condenser 2, an expansion mechanism 3, and an evaporator 4 according to the present embodiment. The refrigeration apparatus 100 performs an operation of a refrigeration cycle in which a refrigerant circulates, by using the refrigerant circuit shown in fig. 1. Specifically, the refrigerant discharged from the discharge pipe 51 of the compressor 1 is introduced into the suction pipe 52 of the compressor 1 via the condenser 2, the expansion mechanism 3, and the evaporator 4.

< Structure of compressor >

Fig. 2 is a longitudinal sectional view of the compressor 1 according to the present embodiment, and fig. 3 is a detailed longitudinal sectional view of an upper portion of the compressor 1 shown in fig. 2. The compressor 1 is a scroll compressor in which at least one of 2 scroll members engaged with each other is rotated to compress a refrigerant.

As shown in fig. 2 and 3, a casing 10 of the compressor 1 includes a substantially cylindrical body portion 11, a bowl-shaped upper wall portion 12 airtightly welded to an upper end portion of the body portion 11, and a bowl-shaped bottom wall portion 13 airtightly welded to a lower end portion of the body portion 11. The casing 10 is molded from a rigid member that is less likely to cause deformation and breakage when pressure and temperature change inside and outside the casing 10. The casing 10 is provided such that the substantially cylindrical axial direction of the body 11 is along the vertical direction. A compression mechanism 15 for compressing a refrigerant, a drive motor 21 disposed below the compression mechanism 15, a drive shaft 24 disposed to extend in the vertical direction in the casing 10, and the like are housed in the casing 10. The discharge pipe 51 and the suction pipe 52 of the refrigerant are joined to the casing 10 in an airtight manner. The refrigerant is introduced into the interior of the casing 10 through the suction pipe 52, compressed by the compression mechanism 15, and then discharged to the outside of the casing 10 through the discharge pipe 51.

In the compressor 1, a space between the compression mechanism 15 and the drive motor 21 inside the casing 10 is referred to as a motor upper space S1, and a space above the compression mechanism 15 inside the casing 10 is referred to as an oil separation space S2.

The compression mechanism 15 is constituted by a fixed scroll member 16 and an orbiting scroll member 17. The fixed scroll member 16 and the orbiting scroll member 17 are each composed of an end plate and a spiral wrap formed upright on the end plate. The wraps of the fixed scroll member 16 and the movable scroll member 17 mesh with each other, thereby forming compression chambers surrounded by the wraps and the end plates. The cover 41 is fastened and fixed to the upper surface of the fixed scroll member 16 by bolts 41a (see fig. 6 and 7). The fixed scroll member 16 has an inner refrigerant discharge pipe 53 extending to an upper portion of the oil separation space S2. The internal refrigerant discharge pipe 53 is an L-shaped pipe: the fixed scroll member 16 extends vertically upward, is bent at an upper portion of the oil separation space S2, and extends horizontally along the top of the casing 10.

The frame 18 is disposed below the compression mechanism 15, and the outer peripheral surface of the frame 18 is engaged with the inner wall of the casing 10. The fixed scroll member 16 is mounted on the frame 18 by bolting or the like. The frame 18 holds the orbiting scroll member 17 together with the fixed scroll member 16 via the oldham coupling 42. The frame 18 is provided with a crank chamber 19. The frame 18 has a bearing portion 20 below the crank chamber 19 for supporting an upper portion of the drive shaft 24. The frame 18 is provided with a refrigerant passage 18a, and the refrigerant passage 18a is connected to the lower end of the inner refrigerant discharge pipe 53 and communicates with the motor upper space S1.

In the present embodiment, the refrigerant introduced into the compression mechanism 15 through the suction pipe 52 is compressed and sent to the motor upper space S1, and then discharged from the discharge pipe 51 to the outside of the casing 10 through the refrigerant passage 18a, the internal refrigerant discharge pipe 53, and the oil separation space S2 (see the hollow dashed arrows in fig. 2 and 3).

The drive motor 21 is, for example, a brushless DC motor, and is disposed below the chassis 18. The drive motor 21 includes a stator 22 fixed to an inner wall of the housing 10, and a rotor 23 rotatably housed inside the stator 22 with a slight gap provided therebetween. The rotor 23 is coupled to the orbiting scroll member 17 at its rotation center via a drive shaft 24. A frame 25 is provided below the drive motor 21, and the frame 25 is fixed to the main body 11 of the casing 10 and supports a lower portion of the drive shaft 24. An oil separation plate 25a is provided on the upper surface of the frame 25 to separate lubricating oil contained in the compressed refrigerant that has descended from the compression mechanism 15. The separated lubricating oil falls to the oil reservoir P at the bottom of the casing 10.

The drive shaft 24 connects the compression mechanism 15 and the drive motor 21, and is disposed to extend in the vertical direction in the casing 10. The lower end portion of the drive shaft 24 is located at the oil reservoir P. An oil supply passage (not shown) penetrating in the axial direction is formed inside the drive shaft 24. When the drive shaft 24 performs the axial rotation motion, the lubricating oil stored in the oil reservoir P flows upward in the oil supply passage by an oil pump (for example, a trochoid pump) disposed at the lower end of the drive shaft 24, and lubricates a sliding portion (a pin bearing or the like) of the compression mechanism 15. An oil supply lateral hole (not shown) for supplying lubricating oil to each sliding portion such as the bearing portion 20 is formed inside the drive shaft 24 so as to be connected to the oil supply passage. The lubricating oil rising in the oil supply passage is supplied to each oil supply lateral hole to lubricate each sliding portion of the drive shaft 24.

< Structure of mechanism for recovering lubricating oil >

Next, a mechanism for recovering the lubricating oil supplied to lubricate the sliding portions of the compression mechanism 15 and the drive shaft 24 will be described.

The lubricating oil used for lubricating the sliding portion of the compression mechanism 15 flows into the crank chamber 19, and then is guided downward through the 1 st oil return passage 31 (see the solid arrows in fig. 2 and 3) as shown in fig. 2 and 3. The 1 st oil return passage 31 is provided with an oil return guide 32 for causing the lubricating oil to flow back. At least the lower portion of the oil return guide 32 is surrounded by an inner wall surface of the casing 10 and an oil return plate 35 extending downward along the inner wall surface. The lubricating oil fed from the outlet of the oil return guide 32 descends in a space surrounded by the oil return plate 35 and the inner wall surface of the casing 10, and returns to the oil reservoir P at the bottom of the casing 10.

Fig. 4 (a) and (b) are perspective views of the oil return guide 32 viewed from the drive shaft 24 side and the housing 10 side, respectively. As shown in fig. 4 (a) and (b), the oil return guide 32 includes a connection hole 32a connected to the crank chamber 19, and a constricted flow portion 32b extending downward along the inner wall surface of the casing 10 (main body portion 11). The constricted portion 32b may have a shape expanding in the circumferential direction in comparison with the radial direction of the cylindrical housing 10. The radial dimension of the constricted portion 32b is, for example, about 2 to 3mm, and the circumferential dimension of the constricted portion 32b may be, for example, about 10 mm.

Fig. 5 (a) and (b) are perspective views of the oil return plate 35 viewed from the drive shaft 24 side and the housing 10 side, respectively. As shown in fig. 5 (a) and (b), the oil return plate 35 includes a surrounding portion 35a surrounding at least a lower portion (the constricted portion 32b) of the oil return guide 32 from the drive shaft 24 side, and a fixing portion 35b fixed to an inner wall surface of the housing 10. The surrounding portion 35a may have a shape such that a space with the inner wall surface of the casing 10 is narrowed downward from the vicinity of the outlet of the oil return guide 32. The fixing portion 35b may have a shape corresponding to the inner wall surface of the housing 10.

Oil used for lubricating the tooth tips of the fixed scroll member 16 and the end plate portion of the orbiting scroll 17 (so-called thrust bearing portion) leaks into the compression chamber during the compression stroke, joins the lubricating oil that originally circulates in the system, and is discharged from the compression chamber to the motor upper space S1 together with the compressed refrigerant. The lubricant oil in the compressed refrigerant exists in a mist form.

Here, as described above, part of the lubricating oil included in the descending compressed refrigerant is separated by the oil separation plate 25a and returned to the oil reservoir P at the bottom of the casing 10, but the remaining lubricating oil is discharged together with the compressed refrigerant to the oil separation space S2 via the refrigerant passage 18a and the internal refrigerant discharge pipe 53 (see the hollow dashed arrow in fig. 2 and 3). The compressed refrigerant is discharged into the oil separation space S2 along the tangential direction of the inner wall surface of the casing 10 (upper wall portion 12), and the discharged compressed refrigerant swirls along the inner wall surface of the upper wall portion 12 in the oil separation space S2 (see the broken-line arrow F in fig. 3). At this time, the lubricant oil contained in the compressed refrigerant is scattered toward the inner wall surface of the upper wall portion 12 by the centrifugal force generated by the swirling flow, and collides with the inner wall surface of the upper wall portion 12. The lubricating oil that has collided and formed into a liquid film falls along the inner wall surface of the upper wall portion 12, and is discharged from the upper oil discharge hole 16a provided in the fixed scroll member 16 to the motor upper space S1 through the 2 nd oil return passage 33 (see the solid arrows in fig. 2 and 3). On the other hand, the compressed refrigerant from which the lubricating oil has been separated in the oil separation space S2 is discharged to the outside of the casing 10 through the discharge pipe 51.

In the present embodiment, the 2 nd oil return passage 33 is formed by a pipe 34 penetrating the fixed scroll member 16 and the frame 18. The inner diameter of the tube 34 is, for example, about 2 mm.

Fig. 6 and 7 are perspective views of the compression mechanism 15, the frame 18, and the periphery thereof before and after the 2 nd oil return passage 33 (pipe 34) is attached.

As shown in fig. 2, 3, 6, and 7, the fixed scroll member 16 is provided with an upper oil discharge hole 16a penetrating vertically, and the frame 18 is provided with a lower oil discharge hole 18b penetrating vertically so as to be connected to the upper oil discharge hole 16 a. A pipe 34 serving as the 2 nd oil return passage 33 is inserted into the upper oil discharge hole 16a and the lower oil discharge hole 18 b. The lower portion of the pipe 34 protrudes into the motor upper space S1 below the frame 18, and the lower end of the pipe 34, that is, the outlet of the 2 nd oil return passage 33 is disposed near the outlet of the oil return guide 32. The oil return plate 35 is disposed between the oil return plate 35 and the inner wall surface of the casing 10 so as to surround at least a lower portion of the pipe 34 together with the oil return guide 32. Thereby, the lubricating oil fed from the lower end of the pipe 34, i.e., the outlet of the 2 nd oil return passage 33, descends in the space surrounded by the oil return plate 35 and the inner wall surface of the casing 10, and returns to the oil reservoir P at the bottom of the casing 10.

The oil return plate 35 may be configured such that a space between the oil return guide 32 and the inner wall surface of the casing 10 is narrowed downward from the vicinity of each outlet of the pipe 34.

Effects of the embodiment

According to the compressor 1 of the present embodiment described above, the outlet of the 2 nd oil return passage 33 of the lubricating oil separated in the oil separation space S2 in the upper portion of the casing 10 is disposed in the vicinity of the outlet of the oil return guide 32 that contracts the lubricating oil discharged downward from the crank chamber 19. Therefore, the lubricating oil separated in the oil separation space S2 can be guided downward through the 2 nd oil return passage 33 not by the contraction flow of the refrigerant gas but by the negative pressure generated by the contraction flow of the lubricating oil. Therefore, the lubricating oil separated in the oil separation space S2 does not flow into the refrigerant gas again, and therefore, oil discharge can be further suppressed.

More specifically, the oil lubricated in the sliding portions (pin bearings, upper main bearings, and the like) of the compression mechanism 15 and the drive shaft 24 once flows into the crank chamber 19, and then returns to the oil reservoir P through the oil return guide 32 and the oil return plate 35. When the lubricating oil is guided from the crank chamber 19 to the return oil guide 32, the oil flows in a contracted manner. Therefore, in particular, the static pressure in the oil return plate 35 in the space near the outlet of the oil return guide 32 becomes a negative pressure compared with the static pressures in the motor upper space S1 and the oil separation space S2. Therefore, by disposing the outlet of the 2 nd oil return passage 33 near the outlet of the oil return guide 32, the liquid oil separated in the head space that becomes the oil separation space S2 is discharged into the oil return plate 35 via the pipe 34 that is the 2 nd oil return passage 33, and is directly returned to the oil reservoir P.

That is, in the compressor 1 having the head space as the oil separation space S2, since the discharged oil from the crank chamber 19 is contracted and the contracted flow region and the oil separation space S2 are communicated with each other through the 2 nd oil return passage 33, the separated oil can flow along the discharged oil and return to the oil reservoir P, and therefore, the compressor 1 having more excellent oil discharge is obtained.

As described above, according to the compressor 1 of the present embodiment, the discharge of oil can be further reduced as compared with the conventional specification (the discharge of liquid oil separated in the head space into the discharged refrigerant gas). Further, since the head space serving as the oil separation space S2 exhibits substantially the same oil separation effect as that of a conventional oil separator provided separately, a structure in which the oil separator is not required can be realized, and therefore, cost reduction and downsizing of an air conditioning system such as a refrigeration apparatus can be realized.

In the compressor 1 of the present embodiment, the 2 nd oil return passage 33 is formed by the pipe 34 penetrating the frame 18, and thus the 2 nd oil return passage 33 can be easily formed.

Further, in the compressor 1 of the present embodiment, the oil return plate 35 is further provided, and the oil return plate 35 is disposed so as to surround at least the lower portions of the 2 nd oil return passage 33 and the oil return guide 32 between the oil return plate 35 and the inner wall surface of the casing 10, whereby scattering of the lubricating oil sent from the outlets of the 2 nd oil return passage 33 and the oil return guide 32 can be suppressed. In this case, the space surrounded by the oil return plate 35 and the inner wall surface of the casing 10 is narrowed downward from the vicinity of the outlet of each of the 2 nd oil return passage 33 and the oil return guide 32, and the flow velocity of the lubricating oil increases as it goes downward, so that the lubricating oil can be efficiently guided downward.

(other embodiments)

In the above-described embodiment, the compressor 1 having the configuration shown in fig. 2 is used, but the configuration is not particularly limited as long as the compressor has a head space as an oil separation space and lubricating oil is reserved in the bottom portion in the present invention. For example, the shape of the oil return guide 32 shown in fig. 4 (a) and (b), the shape of the oil return plate 35 shown in fig. 5 (a) and (b), and the like are merely examples, and are not limited thereto.

In the above embodiment, the 2 nd oil return passage 33 is entirely formed of the pipe 34, but the upper oil discharge hole 16a and the lower oil discharge hole 18b may be used as part of the 2 nd oil return passage 33 as they are. Further, the second oil return passage 33 having no upper oil discharge hole 16a may be configured by not providing the fixed scroll member 16 above the lower oil discharge hole 18b of the frame 18.

Although the oil return plate 35 is disposed in the above embodiment, the oil return plate 35 may not be disposed instead, for example, by extending the oil return guide 32 and the pipe 34 downward.

In the above embodiment, the circular tube extending in the L shape is disposed as the internal refrigerant discharge pipe 53, but instead, for example, the internal refrigerant discharge pipe may be configured by attaching the sheet metal member 54 shown in (a) and (b) of fig. 8 to the inner wall of the upper wall portion 12. Here, fig. 8 (a) and (b) are perspective views of the sheet metal member 54 viewed from the drive shaft side and the housing side, respectively. As shown in fig. 8 (a) and (b), the sheet metal member 54 includes a pipe wall portion 54a that forms a pipe line serving as an internal refrigerant discharge pipe between the inner wall of the upper wall portion 12 and the sheet metal member, and a fixing portion 54b that is fixed to the inner wall surface of the upper wall portion 12. The pipe wall portion 54a may extend vertically upward from the fixed scroll member 16, be bent at an upper portion of the oil separation space S2, and extend horizontally. The fixing portion 54b may have a shape corresponding to the inner wall surface of the upper wall portion 12.

While the embodiments have been described above, it should be understood that various changes in form and details may be made therein without departing from the spirit and scope of the claims. The above embodiments and other embodiments may be combined or substituted as appropriate as long as the functions of the objects of the present invention are not impaired. Further, the above-mentioned descriptions such as "1 st", "2 nd", and … are used for distinguishing the words to which the descriptions are given, and the number and order of the words are not limited.

Industrial applicability

The present invention is useful for compressors and refrigeration units.

Description of the reference symbols

1 compressor

2 condenser

3 expansion mechanism

4 evaporator

10 casing

11 body part

12 upper wall part

13 bottom wall part

15 compression mechanism

16 fixed scroll part

16a upper oil discharge hole

17 orbiting scroll member

18 frame

18a refrigerant passage

18b lower oil discharge hole

19 crank chamber

20 bearing part

21 drive motor

22 stator

23 rotor

24 drive shaft

25 frame

25a oil separating plate

31 st oil return passage

32 oil return guide

32a connecting hole

32b flow reduction part

33 nd 2 oil return passage

34 pipe

35 oil return plate

35a surrounding part

35b fixed part

41 cover body

41a bolt

51 blow out pipe

52 suction pipe

53 internal refrigerant discharge pipe

54 sheet metal parts

54a pipe wall part

54b fixed part

100 refrigeration device

S1 Upper space of Motor

S2 oil separation space

P oil storage part

Claims

1. A compressor, characterized in that the compressor has:

a casing (10) for storing lubricating oil at the bottom;

a compression mechanism (15) housed inside the casing (10);

a frame (18) that supports the compression mechanism (15) and has a crank chamber (19) formed therein; and

a 1 st oil return passage (31) for guiding the lubricating oil flowing into the crank chamber (19) downward,

an oil return guide (32) for causing the lubricating oil to contract is provided in the 1 st oil return passage (31),

an upper portion of the casing (10) constitutes an oil separation space (S2), the oil separation space (S2) separating the lubricating oil from the high-pressure refrigerant discharged from the compression mechanism (15),

the compressor further includes a 2 nd oil return passage (33), the 2 nd oil return passage (33) guiding the lubricating oil separated in the oil separation space (S2) downward,

an outlet of the 2 nd oil return passage (33) is disposed in the vicinity of an outlet of the oil return guide (32).

2. The compressor of claim 1,

the 2 nd oil return passage (33) is formed by a pipe (34) penetrating the frame (18).

3. Compressor according to claim 1 or 2,

the compressor further has an oil return plate (35), and the oil return plate (35) is configured to surround at least lower portions of each of the 2 nd oil return passage (33) and the oil return guide (32) between the oil return plate (35) and an inner wall surface of the casing (10).

4. The compressor of claim 3,

a space surrounded by the oil return plate (35) and the inner wall surface of the casing (10) is narrowed downward from the vicinity of the outlet of each of the 2 nd oil return passage (33) and the oil return guide (32).

5. A refrigeration device, characterized in that it has a compressor (1) according to any one of claims 1 to 4.