JP2013174178A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of sufficiently supplying oil to a lip seal and a main bearing and easy in machining and assembling.SOLUTION: In a compressor 1 in which one end of a driving shaft 21 penetrates a housing 2 and externally protrudes, and a lip seal 31 sealing the outside and inside of the housing 2 at a penetrating portion through the housing 2, an inner end side of the driving shaft 21 is provided with a large diameter portion 24 supported via a bearing 19, the large diameter portion 24 has at least one through-hole 33 which axially penetrates it, and an outer end side facing the lip seal 31 of the large diameter portion 24 is provided with a blade member 34 which sucks refrigerant gas containing oil from a space of an inner end face side via the through-hole 33 and forcibly circulates the gas.

Description

  The present invention relates to a so-called open type compressor in which one end of a drive shaft protrudes outside through a housing and is driven by an external drive source.

  A so-called open type compressor in which one end of a drive shaft that drives a compression mechanism is protruded to the outside through a housing and driven by an external drive source in a compressor with a built-in compression mechanism inside the housing However, it is widely used as a compressor for air conditioners and refrigerators mounted on vehicles equipped with engines. In this type of compressor, a drive shaft connected to a compression mechanism is rotatably supported by a bearing installed in the housing, and one end side is penetrated to the outside of the housing. It is necessary to shaft seal the penetrating portion of the drive shaft so that gas does not leak to the outside, and a lip seal is used for this shaft seal.

  The lip seal is generally configured such that an annular main lip seal and a sub lip seal made of an elastically deformable rubber material or the like are provided on the inner and outer circumferences of a highly rigid metal annular shape retaining material. Then, press the outer peripheral part of the main lip seal corresponding to the shape retaining material into the lip seal housing part on the housing side, and press the lip ends of the main lip seal and sub lip seal against the outer periphery of the rotating shaft and assemble them. The shaft penetrating part of the rotating shaft is sealed.

  On the other hand, the open type compressor does not employ a forced oiling system using a pump from the viewpoint of miniaturization and compactness, and mist oiling using a refrigerant is generally used. Main bearings and lip seals are also lubricated with oil mist contained in the refrigerant gas by exposing them to the atmosphere of the intake refrigerant gas. However, in the housing, the flow of the refrigerant gas sucked from the suction port is not constant, so depending on the operating conditions, there may be insufficient oil supply to the lip seal and the main bearing, etc. This caused flaking of bearing balls and rollers.

  Therefore, an inclined through hole that gradually expands from the outer end surface side toward the inner end surface side is provided in the large diameter portion of the drive shaft (crankshaft) supported by the main bearing, and the outer end surface is utilized using centrifugal force. Patent Document 1 proposes that a refrigerant circulation flow from the space on the side to the space on the inner end face side is generated and the lip seal and the main bearing are lubricated with oil mist contained in the refrigerant gas.

Japanese Patent Laid-Open No. 11-30188

  However, what is proposed in Patent Document 1 is provided with an inclined through hole that expands from the outer end surface side toward the inner end surface side in the large-diameter portion of the drive shaft so as to generate a circulation flow of the refrigerant by centrifugal force. However, since a sufficient inclination cannot be obtained, it is difficult to generate a refrigerant flow sufficient to supply a necessary and sufficient amount of oil to the lip seal or the like. In addition, there is a problem that the through hole has to be formed obliquely with respect to the large diameter portion, which makes it difficult to process.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a compressor that can sufficiently supply oil to the lip seal and the main bearing, and that can be easily processed and assembled. .

In order to solve the above problems, the compressor of the present invention employs the following means.
That is, the compressor according to the present invention has a compression mechanism built in the housing, a drive shaft that drives the compression mechanism is rotatably supported by the housing via a bearing, and one end of the drive shaft is In the compressor, a lip seal that protrudes to the outside through the housing and that seals the inside and outside of the housing is provided at a portion that penetrates the housing, and on the inner end side of the drive shaft, the bearing is interposed. A large-diameter portion to be supported, and at least one through-hole penetrating in the axial direction is provided in the large-diameter portion, and the through-hole is provided on the outer end surface of the large-diameter portion facing the lip seal. A blade member is provided for sucking and forcibly circulating the refrigerant gas containing oil from the space on the inner end face side through the hole.

  According to the present invention, a large-diameter portion supported via a bearing is provided on the inner end side of the drive shaft, and the large-diameter portion is provided with at least one or more through holes penetrating in the axial direction. Since the outer end surface facing the lip seal of the large diameter portion is provided with a blade member that sucks and forcibly circulates the refrigerant gas containing oil from the space on the inner end surface side through the through hole, the housing A part of the low-pressure refrigerant gas containing the oil sucked into the inner suction camber is provided on the outer end surface side of the large-diameter portion of the drive shaft, and the inside of the large-diameter portion is sucked by the blade member that rotates together with the drive shaft. The lip seal and the bearing can be lubricated with the oil mist contained in the refrigerant gas by forcibly circulating from the space on the end surface side to the space on the outer end surface side of the large diameter portion through the through hole and further to the bearing gap. Therefore, sufficient oil supply to the lip seal and bearing can be secured, temperature rise due to wear can be suppressed to prevent abnormal wear of the lip tip, and flaking of bearing balls, rollers, etc. can be prevented. Can extend the life of lip seals and bearings. In addition, when the compressor is stopped, the effect of preventing or reducing the reverse rotation due to the resistance of the blade member, or the effect of preventing the suction of air from the lip seal portion due to the negative pressure in the housing may be expected. it can. Furthermore, it is only necessary to provide a through hole in the large-diameter portion of the drive shaft and attach a blade member to the outer end surface thereof, thereby facilitating processing and assembly.

  Furthermore, the compressor according to the present invention is the above-described compressor, wherein the blade member includes a communication hole communicating with the through hole, and a plurality of constricted portions lacking in a concave curved surface shape are provided on an outer peripheral portion. It is characterized by being a disc.

  According to the present invention, the blade member has a communication hole that communicates with the through hole, and the outer peripheral portion is provided with a plurality of constricted portions that are lacking in a concave curved surface shape on the outer peripheral portion. A portion of the low-pressure refrigerant gas containing oil is removed on the inner end face side of the large-diameter portion by a suction action when a disk provided with a plurality of constricted portions lacking in a concave curved surface is rotated together with the drive shaft. Forcibly circulate from the space through the through hole and the communication hole communicating with the hole to the space on the outer end face side of the large-diameter portion, and apply centrifugal force to the lip seal and bearing installed facing the space. Can also be used to splash oil mist contained in the refrigerant gas. Therefore, a necessary and sufficient amount of oil can be supplied to the lip seal and the bearing, and abnormal wear of the lip seal and flaking of the bearing balls and rollers can be surely prevented.

  Furthermore, the compressor of the present invention is the above-described compressor, wherein the blade member includes a communication hole that communicates with the through-hole, and a plurality of grooves having a bottom surface inclined to form a blade shape on the outer surface side. It is set as the disc provided.

  According to the present invention, the blade member has a communication hole that communicates with the through-hole, and the outer surface is a disc having a plurality of strips with inclined bottom surfaces that form a blade shape. A part of the low-pressure refrigerant gas containing oil is largely absorbed by a suction action when a disk provided with a concave groove with inclined bottom surfaces of a plurality of strips forming a blade shape on the outer surface side is rotated together with the drive shaft. A lip seal that is forced to circulate from the space on the inner end surface side of the diameter portion to the space on the outer end surface side of the large diameter portion through the through hole and the communication hole that communicates with the hole, and faces the space Also, oil mist contained in the refrigerant gas can be splashed against the bearing using centrifugal force. Therefore, a necessary and sufficient amount of oil can be supplied to the lip seal and the bearing, and abnormal wear of the lip seal and flaking of the bearing balls and rollers can be surely prevented.

  Furthermore, the compressor of the present invention is characterized in that, in the above compressor, the blade member is a plurality of blade-shaped plates installed on the outer end surface of the large-diameter portion.

  According to the present invention, since the blade member is a plurality of blade-shaped plates installed on the outer end surface of the large-diameter portion, the plurality of blade-shaped plates installed on the outer end surface of the large-diameter portion are driven. A part of the low-pressure refrigerant gas containing oil is forcibly circulated from the space on the inner end surface side of the large diameter portion to the space on the outer end surface side of the large diameter portion through the through hole by the suction action when rotating together with the shaft. Then, oil mist contained in the refrigerant gas can be splashed against the lip seal and the bearing installed facing the space by utilizing centrifugal force. Therefore, a necessary and sufficient amount of oil can be supplied to the lip seal and the bearing, and abnormal wear of the lip seal and flaking of the bearing balls and rollers can be surely prevented.

  Furthermore, the compressor according to the present invention is the compressor according to any one of the above-described compressors, wherein the blade member has an axial dimension protruding at least outward from an outer end surface of the bearing supporting the large-diameter portion. It is characterized by having a size.

  According to the present invention, since the axial dimension of the blade member is at least a dimension that projects outward from the outer end surface of the bearing that supports the large-diameter portion, the blade member is rotated together with the drive shaft. The oil mist splashed in the centrifugal direction by the centrifugal force is not blocked by the inner ring of the bearing and can be sufficiently scattered to the space on the outer end face side of the large diameter portion. Therefore, a necessary and sufficient amount of oil can be supplied to the lip seal and the bearing installed facing the outer end side space of the large diameter portion, and abnormal wear of the lip seal and bearing balls and rollers can be provided. It is possible to reliably prevent such flaking.

  According to the present invention, a part of the low-pressure refrigerant gas including oil sucked into the suction camber in the housing is provided on the outer end surface side of the large-diameter portion of the drive shaft, and by the suction action of the blade member that rotates together with the drive shaft. The lip seal and the bearing are lubricated with oil mist contained in the refrigerant gas by forced circulation from the space on the inner end surface side of the large diameter portion through the through hole to the space on the outer end surface side of the large diameter portion and further to the bearing gap. Therefore, it is possible to secure a sufficient amount of oil supply to the lip seal and the bearing, to suppress the temperature rise due to wear and to prevent abnormal wear of the lip tip, and to flake the bearing balls, rollers, etc. Can be prevented, and the life of the lip seal and the bearing can be extended. In addition, when the compressor is stopped, the effect of preventing or reducing the reverse rotation due to the resistance of the blade member, or the effect of preventing the suction of air from the lip seal portion due to the negative pressure in the housing may be expected. it can. Furthermore, it is only necessary to provide a through hole in the large-diameter portion of the drive shaft and attach a blade member to the outer end surface thereof, thereby facilitating processing and assembly.

It is the longitudinal cross-sectional view (A) of the compressor which concerns on 1st Embodiment of this invention, and the front and sectional drawing (B) of the member for a circulation. It is the longitudinal cross-sectional view (A) of the compressor which concerns on 2nd Embodiment of this invention, and the front and sectional drawing (B) of the member for a circulation. It is the longitudinal cross-sectional view (A) of the compressor which concerns on 3rd Embodiment of this invention, and the front, plane, and side view (B) of the member for a circulation.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 shows a longitudinal sectional view (A) of a compressor according to a first embodiment of the present invention, and a front view and a sectional view (B) of the circulating member. In addition, although the example applied to the scroll compressor is demonstrated here, this invention is not limited to a scroll compressor.
A scroll compressor (compressor) 1 includes a die-cast housing 2 constituting an outer shell. The housing 2 includes a rear housing 3 having a bottomed cylindrical cup shape in which one end side forming a housing space of the compression mechanism is opened, and bearing housing portions 5 and 6 for installing bearings. And a front housing 4 fitted and mounted on each other via a plurality of bolts (not shown).

  In the housing 2, a scroll compression mechanism (compression mechanism) 7 including a pair of fixed scrolls 8 and a turning scroll 9 is incorporated. As is well known, the scroll compression mechanism 7 separates a pair of the fixed scroll 8 and the orbiting scroll 9 each having a spiral wrap standing on one surface of the end plate from the center by an amount corresponding to the orbiting radius, and the phase of the spiral wrap is 180 degrees. A pair of compression chambers 10 is formed with the scroll center point-symmetrical by shifting and meshing. The fixed scroll 8 is fixedly installed on the inner surface of the rear housing 3 via a plurality of bolts 11. On the other hand, the orbiting scroll 9 is installed so that the back surface of the end plate is supported by the thrust bearing portion 12 of the front housing 4 and is driven to revolve around the fixed scroll 8 via a drive mechanism and a rotation prevention mechanism described later. ing.

  The interior of the housing 2 is partitioned by a seal member 15 on the suction chamber 13 side surrounding the fixed scroll 8 and the orbiting scroll 9 and on the discharge chamber 14 side formed on the back surface of the end plate of the fixed scroll 8. A suction port 16 provided in the rear housing 3 is opened on the suction chamber 13 side, and a discharge port 17 provided on an end plate of the fixed scroll 8 is opened on the discharge chamber 14 side. A configuration in which the refrigerant gas in the suction chamber 13 is sucked into the compression chamber 10 by driving the compression mechanism 7, compressed into a high pressure gas, and then discharged into the discharge chamber 14 from the discharge port 17 through the discharge valve 18. Has been. The high-pressure gas discharged into the discharge chamber 14 is sent to the outside through a discharge pipe (not shown).

  A main bearing (bearing) 19 and a sub-bearing 20 are accommodated and installed in the bearing accommodating portions 5 and 6 of the front housing 4, and the crankshaft (driving shaft) 21 is rotatable around its axis L by both bearings 19 and 20. It is supported. One end of the crankshaft 21 penetrates the shaft hole 22 of the front housing 4 and protrudes to the outside. A pulley 23 with an electromagnetic clutch is coupled to the protruding end, and external driving is performed by turning on and off the electromagnetic clutch. Power from the source can be input. Further, on the other end side of the crankshaft 21, there are provided a large diameter portion 24 supported by the main bearing 19 and a crankpin 25 which is eccentric by an amount corresponding to the turning radius of the orbiting scroll 9.

  A drive bush 27, in which a balance weight 26 is integrally provided, is fitted to the crank pin 25 so as to be swingable around the crank pin 25, and further, an orbiting scroll is provided on the outer periphery of the drive bush 27 via an orbiting bearing 28. A swivel boss 29 provided on the back surface of the 12 end plates is fitted. As a result, a driven crank mechanism in which the turning radius of the orbiting scroll 9 is variable is configured, and the orbiting scroll 9 is orbitally driven with a specific radius via the crankshaft 21.

  Further, a key groove provided on the back surface of the end plate of the orbiting scroll 9 and the bearing surface of the thrust bearing portion 12 is fitted between the back surface of the end plate of the orbiting scroll 9 and the thrust bearing portion 12 of the front housing 4. An anti-rotation mechanism 30 comprising an Oldham ring is provided to prevent the orbiting scroll 9 from rotating. In addition, a lip seal 31 is provided between the main bearing 19 and the sub-bearing 20 to seal the inner side and the outside air side of the housing 2. The lip seal 31 is press-fitted into the lip seal housing portion 32 provided between the bearing housing portions 5 and 6 from the outside and is fixed by a snap ring or the like, and the lip tip is pressed against the outer periphery of the crankshaft 21. Thus, the inner side and the outside air side of the housing 2 are sealed.

  Each component such as the orbiting scroll 9, the main bearing 19, the drive shaft 21, the drive bush 27, the orbiting bearing 28, the rotation preventing mechanism 30 and the lip seal 31 installed in the space on the suction chamber 13 side in the housing 2 and its slide. The moving part is lubricated by oil mist contained in the refrigerant gas sucked into the suction chamber 13. However, the installation site of the lip seal 31 is blocked by the main bearing 19 and the large-diameter portion 24 of the drive shaft 21, and the refrigerant gas only passes through the bearing gap of the main bearing 19. It was not possible to sufficiently lubricate the outer surface side of 19.

  Therefore, in the present embodiment, a plurality of through holes 33 are provided in the large diameter portion 24 of the drive shaft 21, and a space (intake on the inner end surface side through the through holes 33 is formed on the outer end surface side of the large diameter portion 24. A blade member 34 for sucking a part of the refrigerant gas containing oil from the chamber 13) and forcibly circulating it is provided. The blade member 34 is fastened and fixed to the outer end surface of the large-diameter portion 24 via a plurality of bolts 35. As shown in FIG. 1B, the blade member 34 communicates with the through hole 33. A hole 36 is provided, and a plurality of constricted portions 37 lacking in a concave curved surface shape are provided in the outer peripheral portion, and the outer ring side of the outer peripheral portion other than the constricted portion 37 is engaged with the inner ring of the main bearing 19. It is comprised by the disc 39 provided with the collar part 38 to match.

  The thickness of the disc 39, that is, the thickness dimension in the axial direction is set so as to protrude outward from the outer surface of the main bearing 19 by an amount corresponding to the thickness dimension of the flange portion 38. The oil mist can be splashed in the tangential direction by centrifugal force.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The compressor 1 is operated by receiving power from an external drive source and rotating the drive shaft 21. When the drive shaft 21 is rotated, the orbiting scroll 9 of the scroll compression mechanism 7 is driven to revolve around the fixed scroll 8, and the pair of compression chambers 10 are moved from the outer peripheral side toward the center side while decreasing in volume. The As a result, the low-pressure refrigerant gas sucked into the compression chamber 10 from the suction chamber 13 is compressed, becomes a high-temperature high-pressure gas and is discharged from the discharge port 17 into the discharge chamber 14, and then the compressor via the discharge pipe. Sent to the outside.

  During this time, the refrigerant gas containing the oil mist sucked into the suction chamber 13 of the housing 2 from the suction port 16 appropriately flows in the suction chamber 13, and at this time, the oil mist contacts the internal drive part and the sliding part. Lubricate those parts by adhering. On the other hand, the refrigerant gas is prevented from leaking to the atmosphere by the lip seal 31. In other words, the lip seal 31 in which the drive shaft 21 is incorporated in the portion passing through the housing 2 is sealed around the drive shaft 21 by the lip tip being pressed against the outer periphery of the drive shaft 21, so that the drive shaft 21 The penetration part of the shaft completely seals from the atmosphere.

  On the lip seal 31 side, the large diameter portion 24 of the main bearing 19 and the drive shaft 21 serves as a wall, so that the refrigerant gas hardly flows. In the present embodiment, a plurality of through holes 33 are provided in the large diameter portion 24. In addition, a disc 39 as a blade member 34 is provided on the outer end surface side of the large diameter portion 24, and the disc 39 flows in the suction camber 13 by a suction action when rotating with the drive shaft 21. A part of the refrigerant gas containing oil is passed from the inner end surface side space of the large diameter portion 24 through the through hole 33, the communication hole 36 communicating with the through hole 33, the space on the outer end surface side of the large diameter portion 24, and Can be forced to circulate through the bearing gap of the main bearing 19, and the lip seal 31 and the main bearing 19 can be lubricated by the oil mist contained in the refrigerant gas.

  For this reason, it is possible to secure a sufficient amount of oil supply to the lip seal 31 and the main bearing 19, to suppress a temperature rise due to wear and to prevent abnormal wear of the lip tip, and to flake the bearing balls, rollers, etc. Can be prevented, and the lifetime of the lip seal 31 and the main bearing 19 can be extended. Further, when the compressor 1 is stopped, the effect of preventing or reducing the reverse rotation due to the resistance of the disc 39 which is the blade member 34, or the suction of air from the lip seal 31 due to the negative pressure in the housing 2 A prevention effect can also be expected. Furthermore, it is only necessary to provide the through hole 33 in the large diameter portion 24 of the drive shaft 21 and attach the disk 39 as a blade member to the outer end surface thereof, thereby facilitating processing and assembly.

  In addition, the axial dimension, ie, the thickness dimension of the disc 39 that is the blade member 34 is at least a dimension that projects outward from the outer end surface of the main bearing 19 that supports the large diameter portion 24. The oil mist splashed in the centrifugal direction by the centrifugal force when the disc 39 as the blade member 34 is rotated together with the drive shaft 21 is not blocked by the inner ring of the main bearing 19 and It can be sufficiently scattered with respect to the space on the end face side. Therefore, a necessary and sufficient amount of oil can be supplied to the lip seal 31 and the main bearing 19 that are installed facing the outer end surface side space of the large diameter portion 24, and abnormal lip seal 31 wear or Flaking of the balls and rollers of the main bearing 19 can be reliably prevented.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
This embodiment differs from the first embodiment described above in the configuration of the disk 43 that is the blade member 34. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, as shown in FIG. 2B, the blade member 34 installed on the outer end surface of the large-diameter portion 24 of the drive shaft 21 has a plurality of communication holes 40 that communicate with the through holes 33. In addition, a plurality of strips forming a blade shape 41 on the outer surface side are constituted by a disc 43 provided with a concave groove 42 having inclined bottom surfaces. The thickness of the disc 43, that is, the thickness dimension in the axial direction is also set so as to protrude outward from the outer surface of the main bearing 19.

  As described above, the blade member 34 includes the communication hole 40 that communicates with the through hole, and is configured by a disk 43 that is provided with a plurality of strip-shaped bottom grooves 42 that form a blade shape 41 on the outer surface side. The low pressure containing oil by the suction action when the disk 43 provided with the concave grooves 42 having inclined bottom surfaces of the plurality of strips forming the blade shape 41 on the outer surface side is rotated together with the drive shaft 21. A part of the refrigerant gas is forcibly circulated from the space on the inner end face side of the large diameter portion 24 to the space on the outer end face side of the large diameter portion 24 through the through hole 33 and the communication hole 40 communicating with the hole 33. The oil mist contained in the refrigerant gas can be splashed against the lip seal 31 and the main bearing 19 installed facing the space by utilizing the centrifugal force.

  Therefore, according to this embodiment as well, a necessary and sufficient amount of oil can be supplied to the lip seal 31 and the main bearing 19, and abnormal wear of the lip seal 31 and flaking of the balls, rollers, etc. of the main bearing 19. The effect similar to 1st Embodiment can be acquired, such as being able to prevent reliably.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The present embodiment differs from the first and second embodiments described above in the configuration of the blade-shaped plate 46 that is the blade member 34. Since other points are the same as those in the first and second embodiments, description thereof will be omitted.
In the present embodiment, as shown in FIG. 3B, the blade member 34 installed on the outer end surface of the large-diameter portion 24 of the drive shaft 21 is bent into an L shape having a mounting flange 44 and a blade 45. The blade-shaped plate 46 is made of a thin plate, and a plurality of blade-shaped plates 46 are installed on the outer end surface of the large-diameter portion 24 via screws or the like. The height of the blade-shaped plate 46, that is, the height dimension in the axial direction is also set so as to protrude outward from the outer surface of the main bearing 19.

  As described above, even when the plurality of blade-shaped plates 46 are installed on the outer end surface of the large-diameter portion 24 of the drive shaft 21, the plurality of blade-shaped plates 46 are rotated together with the drive shaft 21. As a result of the suction action, a part of the low-pressure refrigerant gas containing oil is forcibly circulated from the space on the inner end face side of the large diameter portion 24 to the space on the outer end face side of the large diameter portion 24 through the through hole 33, The oil mist contained in the refrigerant gas can be splashed against the lip seal 31 and the main bearing 19 that are installed facing the space by utilizing centrifugal force. Accordingly, a necessary and sufficient amount of oil can be supplied to the lip seal 31 and the main bearing 19, and abnormal wear of the lip seal 31 and flaking of balls, rollers, etc. of the main bearing 19 can be reliably prevented. The same effects as those of the first and second embodiments can be obtained.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above embodiment, an example in which the present invention is applied to the scroll compressor 1 has been described, but it is needless to say that the present invention can also be applied to other types of compressors. Also, the blade member 34 has been described as an embodiment configured by the disks 39 and 43 and the blade-shaped plate 46, but other configurations may be used as long as the blade member sucks the refrigerant gas.

1 Scroll compressor (compressor)
2 Housing 7 Scroll compression mechanism (compression mechanism)
19 Main bearing (bearing)
21 Drive shaft 24 Large diameter portion 31 Lip seal 33 Through hole 34 Blade member 36 Communication hole 37 Constricted portion 39 Disk 40 Communication hole 41 Blade shape 42 Concave groove 43 Disk 46 Blade shape plate

Claims (5)

A compression mechanism is built in the housing, and a drive shaft that drives the compression mechanism is rotatably supported by the housing via a bearing, and one end of the drive shaft protrudes outside through the housing, In the compressor provided with a lip seal that seals the inside and outside of the housing at a portion penetrating the housing,
On the inner end side of the drive shaft, a large diameter portion supported via the bearing is provided, and at least one or more through holes penetrating in the axial direction are provided in the large diameter portion,
A blade member that sucks and forcibly circulates a refrigerant gas containing oil from the space on the inner end face side through the through hole is provided on the outer end face side of the large diameter portion facing the lip seal. Compressor characterized by.   2. The blade member according to claim 1, wherein the blade member includes a communication hole that communicates with the through-hole, and is a disc having a plurality of constricted portions that are lacking in a concave curved surface at an outer peripheral portion. The compressor described in 1.   The blade member includes a communication hole that communicates with the through-hole, and is a disc having a plurality of strips that have a slanted bottom surface that forms a blade shape on the outer surface side. The compressor according to claim 1.   The compressor according to claim 1, wherein the blade member is a plurality of blade-shaped plates installed on the outer end surface of the large-diameter portion. 4. The blade member according to claim 1, wherein an axial dimension of the blade member is a dimension that protrudes outward from an outer end surface of the bearing supporting at least the large-diameter portion. The compressor according to crab.

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