JP2011047355A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor including an axial gap motor preventing shortage of lubricating oil in an oil sump. <P>SOLUTION: The compressor (10) includes: a casing (11) formed with the oil sump (18) at the bottom; a drive shaft (20) vertically extending in the casing (11); a motor (30) in which a disk-shaped rotor (32) fixed to the drive shaft (20) and a disk-shaped upper stator (31) fixed to the casing (11) are opposed in an axial direction of the drive shaft (20); and a compression mechanism (40) installed below the motor (30) of the drive shaft (20) in the casing (11) and compressing a refrigerant. A communication passage (70) is formed between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (11) for letting the refrigerant discharged from the compression mechanism (40) flow upward and an oil separator (80) is provided in the communication passage (70) for separating the lubricating oil contained in the refrigerant from the refrigerant. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a compressor, and particularly relates to a countermeasure for lack of lubricating oil in a compressor provided with an axial gap motor.

  Conventionally, a compressor in which a drive shaft extending in the vertical direction, a compression mechanism attached to the drive shaft, and a motor that rotationally drives the drive shaft are accommodated in a casing. In some of such compressors, the compression mechanism is disposed below the motor, and the discharge pipe is provided above the casing motor. In such a compressor, the refrigerant compressed in the compression mechanism is discharged into the casing, flows upward through the gap of the motor, and is discharged from the discharge pipe to the outside (for example, see Patent Document 1).

  By the way, normally, in the compressor as described above, an oil reservoir portion in which lubricating oil to be supplied to each sliding portion is stored is formed in the lower portion of the casing. The lubricating oil supplied from the oil reservoir to each sliding portion is configured to return to the oil reservoir by being discharged from the gap between the components and falling downward by gravity.

JP-A-10-141271

  However, some of the compressors use a so-called axial gap type motor in which a rotor and a stator are arranged so as to face each other in the axial direction. In such a compressor, the refrigerant discharged into the casing from the compression mechanism below the motor passes through the gap between the motor and the casing, reaches the upper space of the motor, and is discharged from the discharge pipe to the outside. At this time, a part of the lubricating oil supplied to the compression mechanism joins the flow of the discharged refrigerant and is blown up above the motor, while the lubricating oil supplied to the motor is also subjected to centrifugal force due to rotation of the rotor together with refrigerant near the rotor. In response, it is pushed out to the outer peripheral side of the rotor, merged with the flow of the discharged refrigerant, and blown up above the motor. As a result, there is a problem that the lubricating oil accumulates on the upper surface of the motor, and the lubricating oil in the oil reservoir becomes insufficient.

  This invention is made | formed in view of this point, The objective is to prevent lack of lubricating oil of an oil reservoir part in the compressor provided with the axial gap motor.

  A first invention is a casing (11) having an oil reservoir (18) for storing lubricating oil supplied to each sliding portion at the bottom, and a drive shaft extending in the vertical direction in the casing (11). (20), a disk-shaped rotor (32) fixed to the drive shaft (20), and a disk-shaped first stator (31) fixed to the casing (11) include the drive shaft (20). ) In the casing (11) and a compression mechanism (40) that is attached below the motor (30) of the drive shaft (20) and compresses the refrigerant. A refrigerant provided in which the refrigerant discharged from the compression mechanism (40) flows upward between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (11). While the passage (70) is formed, the refrigerant passage (70) receives the lubricating oil contained in the refrigerant as a refrigerant. Oil separating means (80) is provided to separate.

  In the first invention, a refrigerant passage (70) is formed between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (11), and an oil separating means (80) is provided in the refrigerant passage (70). It has been. Therefore, the lubricating oil supplied to the compression mechanism (40) provided below the motor (30) flows upward in the refrigerant passage (70) together with the refrigerant discharged from the compression mechanism (40). On the other hand, the lubricating oil supplied to the motor (30) is pushed to the outer peripheral side of the motor (30) by the centrifugal force generated by the rotation of the rotor (32) together with the refrigerant near the rotor (32), and flows through the refrigerant passage (70). It merges with the refrigerant discharged from the compression mechanism (40) and flows upward in the refrigerant passage (70). When the refrigerant containing lubricating oil reaches the oil separating means (80) in the refrigerant passage (70), the lubricating oil is separated from the refrigerant by the oil separating means (80). The separated lubricating oil falls along the side surface of the refrigerant passage (70) (the inner peripheral surface of the casing or the outer peripheral surface of the motor) and returns to the lower oil reservoir (18).

  In a second aspect based on the first aspect, the first stator (31) is provided above the rotor (32), and the oil separating means (80) includes the first stator (31) and the casing. (11) is provided with an oil capturing member (81) extending in a direction intersecting with the refrigerant passage (70) and capturing the lubricating oil in the refrigerant passage (70).

  In the second invention, the oil catching member (81) for catching the lubricating oil is provided between the first stator (31) and the casing (11) provided above the rotor (32). That is, the oil catching member (81) is provided above the rotor (32). Therefore, the lubricating oil supplied to the compression mechanism (40) and entered the refrigerant passage (70) and the centrifugal force generated by the rotation of the rotor (32) supplied to the motor (30) were pushed out to the refrigerant passage (70). Both the lubricating oil is captured by the oil capturing member (81).

  In a third aspect based on the second aspect, the oil catching member (81) has one end fixed to the first stator (31) and the other end welded to the casing (11). A welded portion of the first stator (31) that fixes the first stator (31) to the casing (11) is formed.

  In the third invention, the first stator (31) is also fixed to the casing (11) by providing the oil capturing member (81) by welding to the casing (11).

  In a fourth aspect based on the third aspect, the refrigerant passage (70) is formed over the entire circumference of the motor (30).

  In the fourth invention, as described above, since the first stator (31) is fixed to the casing (11) by the oil catching member (81), it is necessary to separately form a welded portion in the first stator (31) itself. There is no. Therefore, the refrigerant passage (70) can be formed over the entire circumference of the first stator (31) and the rotor (32). Thereby, since the passage cross-sectional area of the refrigerant passage (70) is increased, the flow velocity of the refrigerant is reduced, and the separated lubricating oil is difficult to flow backward (flow from the lower side of the motor (30) upward).

  According to a fifth invention, in any one of the second to fourth inventions, the first stator (31) is formed with a through hole (31a) penetrating vertically in a central portion, and an upper surface from an outer peripheral edge. It is formed in a mortar shape so as to incline downward toward the through hole (31a).

  In the fifth invention, even if a part of the lubricating oil contained in the refrigerant in the refrigerant passage (70) reaches the upper surface of the first stator (31) without being caught by the oil catching member (81), Since the upper surface of the stator (31) is formed in a mortar shape, the lubricating oil flows toward the center and falls from the through hole (31a) formed in the center toward the lower rotor (32). It will be. The lubricating oil that has reached the rotor (32) is subjected to the centrifugal force generated by the rotation of the rotor (32), and is pushed out together with the refrigerant in the vicinity of the rotor (32) to the outside in the radial direction. To do. That is, by forming the first stator (31) as described above, the lubricating oil that has not been captured by the oil capturing member (81) can be removed from the through hole (31a) of the first stator (31) and the refrigerant passage (70). ) And the oil trapping member (81) is contacted several times until it is separated from the refrigerant.

  In a sixth aspect based on the second aspect, the oil catching member (81) has a plate-like member (81a) that forms the upper surface of the refrigerant passage (70).

  In the sixth invention, the refrigerant flowing upward in the refrigerant passage (70) abuts on the plate-like member (81a) forming the upper surface of the refrigerant passage (70) and the flow direction is bent in the lateral direction, The lubricating oil contained in the refrigerant comes into contact with and adsorbs to the plate-like member (81a). Thereby, the lubricating oil is easily separated from the refrigerant.

  In a seventh aspect based on the sixth aspect, the plate member (81a) is constituted by a curved plate or a bent plate.

  In the seventh invention, since the plate-like member (81a) is constituted by a curved plate or a bent plate, the contact area between the refrigerant flowing through the refrigerant passage (70) and the plate-like member (81a) is expanded. Therefore, the lubricating oil in the refrigerant is easily adsorbed by the plate-like member (81a) and is easily captured.

  In an eighth aspect based on the sixth aspect, the oil separating means (80) includes a plurality of projecting members (82) projecting into the refrigerant passage (70) from the wall surface forming the refrigerant passage (70). I have.

  In the eighth aspect of the invention, since the plurality of protruding members (82) are formed on the wall surface forming the refrigerant passage (70), the lubricating oil contained in the refrigerant flowing through the refrigerant passage (70) and the wall surface are formed. The frictional force that occurs at Therefore, the lubricating oil contained in the refrigerant in the refrigerant passage (70) is easily adsorbed to the wall surface forming the refrigerant passage.

  According to a ninth invention, in any one of the second to eighth inventions, the motor (30) is a disc-shaped second stator (opposed to the rotor (32) below the rotor (32)). 33), and the oil separating means (80) extends in a direction intersecting the refrigerant passage (70) between the second stator (33) and the casing (11) to extend the refrigerant passage ( 70) A second oil catching member (91) for catching the lubricating oil inside is provided.

  In the ninth invention, the motor (30) includes a disk-shaped rotor (32) and two disk-shaped stators (31, 33) opposed to each other above and below the rotor (32). Yes. Further, between the stators (31, 33) and the casing (11), oil catching members (81, 91) for catching the lubricating oil in the refrigerant passage (70) are provided. As a result, the lubricating oil in the refrigerant flowing through the refrigerant passage (70) is captured by the two oil capturing members (81, 91).

  In a tenth aspect based on the ninth aspect, at least one of the first stator (31) and the second stator (33) has a plurality of magnetic fluxes formed in a direction parallel to the drive shaft (20). The casing (11) is provided with a winding (36), and the portion corresponding to the motor (30) is formed to have a larger diameter than at least the portion corresponding to the compression mechanism (40).

  In the tenth invention, the portion of the casing (11) corresponding to the motor (30) is formed with a larger diameter than the portion corresponding to the compression mechanism (40). Therefore, a wide refrigerant passage (70) is formed on the outer peripheral side of the motor (30) without reducing the diameter of the motor (30).

  According to the present invention, the oil separation means (80) is provided in the refrigerant passage (70) formed between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (11). Lubricating oil can be separated in the refrigerant passage (70). Therefore, accumulation of lubricating oil on the upper surface of the motor (30) can be prevented, and the separated lubricating oil can be quickly returned to the oil reservoir (18) at the bottom of the casing (11). Therefore, according to the present invention, in the compressor (10) including the axial gap motor (30), it is possible to prevent a shortage of lubricating oil in the oil reservoir (18).

  According to the second invention, the oil capturing member (81) is provided between the first stator (31) and the casing (11) provided above the rotor (32), whereby the compression mechanism ( Both the lubricating oil supplied to 40) and the lubricating oil supplied to the motor (30) can be easily separated.

  Further, according to the third invention, the welded portion for fixing the first stator (31) to the casing (11) and the oil catching member (81) can be constituted by one member. Therefore, they can be easily formed and can be easily attached to the casing (11).

  According to the fourth invention, the flow rate of the refrigerant flowing through the refrigerant passage (70) can be suppressed by forming the refrigerant passage (70) over the entire circumference of the motor (30). Thus, the lubricating oil captured by the oil capturing member (81) does not flow backward due to the flow of the refrigerant in the refrigerant passage (70), but is smoothly dropped downward by gravity and returned to the oil reservoir (18). be able to.

  According to the fifth aspect, the through hole (31a) is provided in the central portion of the first stator (31), and the upper surface of the first stator (31) is directed downward toward the through hole (31a) in the central portion. The lubricating oil not trapped by the oil trapping member (81) in the refrigerant passage (70) is removed from the through hole (31a) of the first stator (31) through the rotor (32 ) It can be dropped upward, pushed outward in the radial direction by the centrifugal force of the rotor (32), and joined again to the refrigerant passage (70). That is, the lubricating oil that has not been captured by the oil capturing member (81) is circulated between the through hole (31a) of the first stator (31) and the refrigerant passage (70), so that the oil capturing member ( 81) can be contacted. Therefore, the lubricating oil can be prevented from accumulating on the upper surface of the first stator (31), and the lubricating oil can be more reliably captured and returned to the oil reservoir (18).

  According to the sixth aspect of the invention, the lubricating oil in the refrigerant flowing through the refrigerant passage (70) can be easily separated with a simple configuration (plate member (81a)).

  According to the seventh invention, the contact area between the refrigerant in the refrigerant passage (70) and the plate member (81a) is increased by configuring the plate member (81a) with a curved plate or a bent plate. Therefore, the lubricating oil in the refrigerant can be reliably adsorbed and captured by the plate-like member (81a). Therefore, the lubricating oil in the refrigerant can be more reliably separated from the refrigerant.

  According to the eighth aspect of the invention, the plurality of protruding members (82) are provided on the wall surface forming the refrigerant passage (70), so that the lubricating oil contained in the refrigerant flowing through the refrigerant passage (70) and the wall surface are provided. The frictional force generated between the two can be increased. Thereby, the lubricating oil contained in the refrigerant in the refrigerant passage (70) is easily adsorbed to the wall surface forming the refrigerant passage (70). Therefore, the lubricating oil in the refrigerant can be captured not only by the oil capturing member (81) but also by the wall surface of the coolant passage (70). Therefore, the lubricating oil can be more reliably separated from the refrigerant in the refrigerant passage (70).

  Further, according to the ninth aspect, the lubricating oil in the refrigerant flowing through the refrigerant passage (70) can be effectively captured by the two oil capturing members (81, 91) and separated from the refrigerant.

  By the way, if the passage cross-sectional area of the refrigerant passage (70) is small, the flow velocity of the refrigerant flowing through the refrigerant passage (70) increases, and the lubricating oil separated by the oil separation means (80) goes against the refrigerant flow. It becomes difficult to return to the oil sump (18). However, in the axial gap motor (30), at least one of the plurality of windings (36) of the first stator (31) and the second stator (33) has a magnetic flux parallel to the drive shaft (20). It is provided so as to be formed in the direction. Therefore, if the diameter of the motor (30) is reduced in order to widen the passage width of the refrigerant passage (70), the winding area is reduced and the efficiency is reduced.

  Therefore, according to the tenth invention, the diameter of the motor (30) is reduced because the portion corresponding to the motor (30) of the casing (11) has a larger diameter than the portion corresponding to the compression mechanism (40). Without this, a wide refrigerant passage (70) can be formed on the outer peripheral side of the motor (30). Moreover, the enlargement of the whole compressor (10) can be suppressed by forming only the part corresponding to the motor (30) of the casing (11) with a large diameter. Therefore, it is possible to provide the compressor (10) that can more reliably separate the lubricating oil from the refrigerant and prevent the oil reservoir (18) from shortage of the lubricating oil without reducing the efficiency of the motor (30). .

FIG. 1 is a longitudinal sectional view of a compressor according to the first embodiment. FIG. 2 is a cross-sectional view of the compression mechanism of the compressor according to the first embodiment. FIG. 3 is an exploded perspective view of the motor of the compressor according to the first embodiment. FIG. 4 is a longitudinal sectional view showing an oil separator of the compressor according to the second embodiment. FIG. 5 is a longitudinal sectional view showing an oil separator of a compressor according to the third embodiment. FIG. 6 is an exploded perspective view of the motor of the compressor according to the third embodiment. FIG. 7 is a longitudinal sectional view showing an oil separator of a compressor according to the fourth embodiment. FIG. 8 is a longitudinal sectional view showing an oil separator of a compressor according to the fifth embodiment. FIG. 9 is a longitudinal sectional view showing an oil separator of a compressor according to the sixth embodiment. FIG. 10 is a longitudinal sectional view showing an oil separator of a compressor according to the seventh embodiment. FIGS. 11A and 11B are longitudinal sectional views showing an oil separator of a compressor according to the eighth embodiment. FIG. 12 is a longitudinal sectional view showing an oil separator according to the first modification. FIG. 13 is a longitudinal sectional view showing an oil separator according to the second modification. FIG. 14 is a longitudinal sectional view showing an oil separator according to Modification 3. FIG. 15 is a longitudinal sectional view showing an oil separator according to Modification 4. FIG. 16 is a longitudinal sectional view showing an oil separator according to Modification 5. FIG. 17 is a longitudinal sectional view showing an oil separator according to Modification 6. FIG. 18 is a longitudinal sectional view showing an oil separator according to Modification 7. FIG. 19 is a longitudinal sectional view showing a compressor according to another embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1
As shown in FIG. 1, the compressor (10) according to the first embodiment is a rotary compressor and constitutes a so-called oscillating piston type compressor. The compressor (10) constitutes a so-called two-cylinder compressor that compresses refrigerant in two cylinder chambers.

  As shown in FIG. 1, the compressor (10) has a vertically long cylindrical hermetic dome-shaped casing (11). The casing (11) constitutes a pressure vessel having a hollow inside. The casing (11) is configured by integrally joining a body (12), an upper wall (13), and a lower wall (14). Two suction pipes (15, 16) pass through the outer peripheral wall of the body (12) of the casing (11), and the outflow end of the suction pipe (15, 16) is the internal space of the casing (11) (S1 ) Is open. Note that, at the inflow ends of these two suction pipes (15, 16), the low-pressure side pipe of the refrigerant circuit is branched into two and connected in parallel. Also, the discharge pipe (17) penetrates the top of the upper wall part (13) of the casing (11), and the inflow end of the discharge pipe (17) opens into the internal space (S1) of the casing (11). Yes. On the other hand, an oil reservoir (18) for storing lubricating oil is formed by the inner surface of the lower wall (14) at the lower part of the internal space (S1) of the casing (11).

  The inner space (S1) of the casing (11) accommodates a drive shaft (20), a motor (30) that rotationally drives the drive shaft (20), and a compression mechanism (40) that compresses the refrigerant. Yes. The compression mechanism (40) and the motor (30) are connected by a drive shaft (20) extending vertically, and the compression mechanism (40) is provided below the motor (30). Moreover, although mentioned later for details, the motor (30) is comprised by what is called an axial gap type motor.

  Two eccentric portions (26, 27) are provided at the lower portion of the drive shaft (20). These eccentric parts are composed of a first eccentric part (26) closer to the upper side and a second eccentric part (27) closer to the lower side. The eccentric positions of the first eccentric part (26) and the second eccentric part (27) are determined so that the phases in the rotational direction of the drive shaft (20) are shifted from each other by 180 °. Also, at the lower end of the drive shaft (20), the lubricating oil in the oil reservoir (18) is guided to an oil supply path (not shown) formed in the drive shaft (20) and connected to each sliding portion. A centrifugal pump (21) is provided.

  The compression mechanism (40) is a rotary compression mechanism, and constitutes a two-cylinder compression mechanism in which two rotary compression mechanism portions (41a, 41b) are connected coaxially. The two rotary compression mechanisms (41a, 41b) are so-called oscillating piston types in which the piston in the cylinder is integrally connected to the blade and performs eccentric rotational movement so that the piston oscillates in the cylinder. The compression mechanism is configured.

  The compression mechanism (40) includes, in order from the upper side to the lower side of the drive shaft (20), a front head (50), a first cylinder (42a), a middle plate (51), a second cylinder (42b), and A rear head (52) is provided. These members are integrally fixed by fastening members such as bolts and nuts.

  The front head (50) is welded and fixed to the inner peripheral surface of the body (12) of the casing (11). The drive shaft (20) is penetrated through the center of the front head (50), and the center of the front head (50) is configured as a bearing portion of the drive shaft (20).

  The middle plate (51) is interposed between the first cylinder (42a) and the second cylinder (42b). The middle plate (51) is formed of an annular plate member, and the drive shaft (20) passes through the middle plate (51).

  The rear head (52) is fixed to the lower surface of the second cylinder (42b). The drive shaft (20) is passed through the center of the second cylinder (42b), and the center portion of the rear head (52) is configured as a bearing portion of the drive shaft (20).

  The first rotary compression mechanism (41a) and the second rotary compression mechanism (41b) have substantially the same structure. That is, as shown in FIG. 2, each rotary compression mechanism (41a, 42b) includes a cylinder (42a, 42b), a piston (43a, 43b), a pair of bushes (44a, 44b), and a blade (45a, 45b). ) And each.

  Each cylinder (42a, 42b) is formed in a substantially cylindrical shape, and forms a cylinder chamber (46a, 46b) therein. That is, the first cylinder (42a) has an annular first cylinder chamber (46a) defined therein by the openings at both axial ends being closed by the front head (50) and the middle plate (51). ing. Further, the second cylinder (42b) has an annular second cylinder chamber (46b) formed therein by the openings at both axial ends being closed by the middle plate (51) and the rear head (52). Yes.

  A first suction pipe (15) is inserted through the first cylinder (42a) in the radial direction, and an outflow end of the first suction pipe (15) communicates with the first cylinder chamber (46a). The second suction pipe (16) is inserted through the second cylinder (42b) in the radial direction, and the outflow end of the second suction pipe (16) communicates with the second cylinder chamber (46b). The first cylinder chamber (46a) has an inflow end of the first discharge port (19a) that passes through the front head (50). In the second cylinder chamber (46b), the inflow end of the second discharge port (19b) penetrating the rear head (52) is opened. The first discharge port (19a) constitutes a discharge port through which the refrigerant compressed in the first cylinder chamber (46a) flows out, and the second discharge port (19b) is compressed in the second cylinder chamber (46b). A discharge port through which the refrigerant flows is configured.

  The first piston (43a) is formed in a cylindrical shape that is fitted around the first eccentric portion (26), and is accommodated in the first cylinder chamber (46a). The second piston (43b) is formed in a cylindrical shape that is fitted onto the second eccentric portion (27), and is accommodated in the second cylinder chamber (46b). Thereby, each piston (43a, 43b) is configured to perform an eccentric rotational motion together with the eccentric portion (26, 27) while being in sliding contact with the inner peripheral surface of the cylinder chamber (46a, 46b).

  The pair of first bushes (44a) are fitted in circular first bush grooves (47a) formed in the first cylinder (42a), and the pair of second bushes (44b) are fitted in the second cylinder (42b). Is fitted into a circular second bush groove (47b). The pair of bushes (44a, 44b) has an arcuate surface and a flat surface that are in sliding contact with the inner peripheral surface of the bush groove (47a, 47b), and the paired flat surfaces face each other. . The blades (45a, 45b) are inserted between the flat surfaces of the pair of bushes (44a, 44b).

  Each blade (45a, 45b) extends in the radial direction of the cylinder (42a, 42b). The first blade (45a) is integrally connected to the outer peripheral surface of the first piston (43a). The second blade (45b) has one end engaged between the pair of second bushes (44b), and the other end connected to the outer peripheral surface of the second piston (43b). Each blade (45a, 45b) has a cylinder chamber (46a, 46b), a suction side (low pressure side) space communicating with the suction pipe (15, 16), and a discharge side communicating with the discharge port (19a, 19b) It is partitioned from the (high-pressure side) space.

  In each of the rotary compression mechanisms (41a, 41b) configured as described above, the piston (43a, 43b) rotates eccentrically in the cylinder chamber (46a, 46b) and the blade (45a, 45b) has a bush (44a, 44b), and the bushes (44a, 44b) swing in the bush groove (47). As a result, the refrigerant sucked into the cylinder chambers (46a, 46b) from the suction pipes (15, 16) is compressed, and the compressed refrigerant flows out to the discharge ports (19a, 19b).

  As shown in FIG. 1, a first muffler chamber (61) is formed on the above-described rear head (52) side. Specifically, a substantially annular groove is formed on the lower surface of the rear head (52), and an annular first cover plate (53) is attached so as to close the groove. Thus, the first muffler chamber (61) is formed between the groove on the lower surface of the rear head (52) and the first cover plate (53). In the first muffler chamber (61), the outflow end of the second discharge port (19b) is opened.

  Further, a second muffler chamber (62) is formed on the above-described front head (50) side. Specifically, a substantially annular groove is formed on the upper surface of the front head (50), and a substantially annular second cover plate (54) is attached so as to close the groove. The second cover plate (54) has an inclined portion formed on the radially inner side and a flat plate portion formed on the radially outer side. The inclined portion of the second cover plate (54) is formed in a tapered shape so as to descend from the radially inner side to the outer side, and the bearing portion of the front head (50) passes through the inside thereof. The flat plate portion of the second cover plate (54) has an inner edge portion connected to a lower end portion of the inclined portion, while an outer edge portion is fitted and held in a step portion formed on the front head (50). Thus, the second muffler chamber (62) is formed between the groove on the upper surface of the front head (50) and the second cover plate (54). In the second muffler chamber (62), the outflow end of the first discharge port (19a) is opened.

  A substantially annular third cover plate (55) is attached to the upper side of the second cover plate (54). The third cover plate (55) includes an inner flat plate portion formed radially inward, an intermediate inclined portion connected to the outer edge portion of the inner flat plate portion, and an outer flat plate connected to the outer edge portion of the intermediate inclined portion. Part. The bearing portion of the front head (50) passes through the inner flat plate portion of the third cover plate (55). Moreover, the intermediate | middle inclination part of the 3rd cover board (55) is formed in the taper shape which falls toward the outer side from radial inside. Further, the outer flat plate portion of the third cover plate (55) has the inner edge portion connected to the outer edge portion of the intermediate inclined portion, and the outer edge portion is fitted and held in the step portion of the front head (50). Thus, a third muffler chamber (63) is formed between the third cover plate (55) and the second cover plate (54).

  The second cover plate (54) has a first outlet (not shown) through which the refrigerant in the second muffler chamber (62) flows out to the third muffler chamber (63). The third cover plate (55) is formed with a second outlet (not shown) through which the refrigerant in the third muffler chamber (63) flows out to the internal space (S1) of the casing (11).

  Further, as shown in FIG. 2, the first muffler chamber (61) and the second muffler chamber (62) are connected by two refrigerant guide channels (C). That is, one end of these refrigerant guide channels (C) is connected to branch to the first muffler chamber (61). Moreover, the other end of these refrigerant | coolant guide flow paths (C) is connected with the internal space (S1) of the casing (11) through the 2nd muffler chamber (62) and the 3rd muffler chamber (63). Each refrigerant guide channel (C) passes through the rear head (52), the second cylinder (42b), the middle plate (51), the first cylinder (42a), and the front head (50) continuously in the axial direction. Is formed.

  As shown in FIG. 1, the motor (30) is attached to the top of the drive shaft (20). The motor (30) includes a disc-shaped rotor (32) fixed to the drive shaft (20), and an upper stator ( 31) and a lower stator (33). The upper stator (31) is disposed above the rotor (32), and the lower stator (33) is disposed below the rotor (32). Both the upper stator (31) and the lower stator (33) are fixed to the casing (11) by welding.

  The upper stator (31) includes a stator core (35), a plurality of axial coils (36), a plurality of magnetic plates (37), and a reinforcing plate (38) that reinforces the stator core (35).

  The stator core (35) includes a back yoke (35a) made of a magnetic body and formed of an annular plate member, and a plurality of (for example, 12) teeth (35b) made of a magnetic body. A plurality of planarly shaped trapezoidal grooves (35c) are formed on the lower surface of the back yoke (35a) at substantially equal intervals in the circumferential direction. On the other hand, each of the plurality of teeth (35b) is formed in a substantially trapezoidal columnar body having a planar shape substantially equal to the groove (35c) of the back yoke (35a). Each tooth (35b) is fitted in a groove (35c) of the back yoke (35a). With such a configuration, the plurality of teeth (35b) are magnetically connected to each other by the back yoke (35a).

  The axial coil (36) is wound around each of the plurality of teeth (35b) around a direction parallel to the drive shaft (20). The axial coil (36) is configured as a multiphase coil (for example, a three-phase coil), is star-connected, and current is supplied from the inverter.

  In addition, in this embodiment, an axial coil (36) points out the aspect by which the conducting wire was wound together. Further, in the present embodiment, a so-called concentrated winding in which each of the axial coils (36) is wound around one tooth (35b) is illustrated, but the axial coil (36) is not limited to this, for example, distributed winding. It may be.

  The magnetic plates (37) are respectively attached to the opposite sides (sides facing the rotor (32)) of the plurality of teeth (35b) from the back yoke (35a). Each magnetic plate (37) is formed in a trapezoidal shape whose planar shape is larger than that of the teeth (35b). Thereby, the area of the opposing surface which opposes the air gap of the magnetic body (tooth (35b)) which penetrates each axial coil (36) is expanded. That is, by providing such a magnetic body plate (37), the field magnetic flux from the permanent magnet (32a) of the rotor (32) described later is easily linked to each axial coil (36).

  The reinforcing plate (38) has the same outer shape as the back yoke (35a). The reinforcing plate (38) is fixed to the back yoke (35a) in contact with the upper surface of the back yoke (35a).

  A core cut (35d) configured as a through-hole penetrating in the vertical direction is provided on the outer edge of the back yoke (35a). Further, a cutout portion (38a) penetrating in the vertical direction in the same planar shape is formed at the outer edge portion of the reinforcing plate (38) at a position corresponding to the core cut (35d) of the back yoke (35a). . Due to the core cut (35d) of the back yoke (35a), the notch (38a) of the reinforcing plate (38), and the space outside the axial coil (36), both sides in the axial direction of the upper stator (31) A stator outer edge passage (71) communicating with the space is formed.

  The rotor (32) includes a plurality (eight in this embodiment) of plate-like permanent magnets (32a), the same number (eight) of magnetic bodies (32b), and these permanent magnets (32a) and magnetic bodies ( 32b) and a holder (32c).

  The holder (32c) includes a cylindrical boss portion through which the drive shaft (20) is inserted, a plurality of (8 in this embodiment) rod-like spoke portions extending radially from the boss portion, and an outer side of the spoke portion. And an annular rim portion connecting the end portions. The holder (32c) is fixed to the drive shaft (20) by the boss portion being fitted on the drive shaft (20). Eight slits (34) are formed by the boss portion, the spoke portion, and the rim portion. Each slit (34) is configured by a lower slit (34a) in which the permanent magnet (32a) is fitted and an upper slit (34b) in which the magnetic body (32b) is fitted. The upper slit (34b) is formed so that its planar shape is slightly larger than the lower slit (34a). The rim portion of the holder (32c) is formed to have a smaller diameter than the inner diameter of the trunk portion (12) of the casing (11), and an annular rotor is provided between the holder (32c) and the inner surface of the trunk portion (12). An outer edge passage (72) is formed.

  The eight permanent magnets (32a) have a planar shape that is substantially the same as the lower slit (34a) of the holder (32c), and are fitted into the lower slit (34a). Each permanent magnet (32a) is magnetized in the direction along the drive shaft (20) (thickness direction of the permanent magnet (32a)), and has N or S poles on both sides. . And each permanent magnet (32a) is arrange | positioned so that the polarity of the magnetic pole of an adjacent permanent magnet (32a) may differ.

  The eight magnetic bodies (32b) are formed in a shape substantially equal to the upper slit (34b) of the holder (32c) whose planar shape is slightly larger than that of the permanent magnet (32a), and is formed in the upper slit (34b). It is inserted. Each magnetic body (32b) is in contact with the upper surface of the permanent magnet (32a) fitted in the lower slit (34a). These magnetic bodies (32b) alleviate the influence of the demagnetizing field acting on each permanent magnet (32a) when the demagnetizing field acts on the rotor (32) by the external magnetic field of the excited upper stator (31). The permanent magnets (32a) are prevented from demagnetizing. Since the lower stator (33) described in detail below does not have a coil and is not excited, it is not necessary to consider the demagnetizing field from the lower stator (33). Therefore, no magnetic material is provided below the permanent magnet (32a), and the lower surface of the permanent magnet (32a) is exposed.

  The lower stator (33) has a stator core (33a) made of an annular plate member made of a magnetic material, and an annular magnetic material (33b). The stator core (33a) has an annular groove (33c) formed at a position corresponding to the permanent magnet (32a) of the rotor (32), and an annular magnetic body (33b) is embedded in the groove (33c). .

  The outer edge of the stator core (33a) is provided with a core cut formed in a through hole penetrating in the axial direction of the drive shaft (20), and both sides of the lower stator (33) in the axial direction are provided by the core cut. The stator outer edge passage (73) that communicates with each other is formed.

<Communication path>
On the outer peripheral side of the motor (30), the stator outer edge passage (71), the rotor outer edge passage (72), and the stator outer edge passage (73) continuously extend in the axial direction of the drive shaft (20). A communication path (70) that communicates the space (upper space and lower space) on both sides in the axial direction of (30) is configured. Although details will be described later, the refrigerant discharged from the compression mechanism (40) flows through the communication path (70) from below to above. The communication passage (70) is provided with an oil separator (80) for separating the lubricating oil from the refrigerant flowing through the communication passage (70). The oil separator (80) constitutes an oil separation means according to the present invention. The communication passage (70) is also used as an oil return passage for returning the lubricating oil separated from the refrigerant in the oil separator (80) to the oil reservoir (18) at the bottom of the casing (11).

<Oil separator>
The oil separator (80) is a plate-like member (81a) extending substantially parallel to the upper surface of the upper stator (31) (in this embodiment, the upper surface of the reinforcing plate (38)) above the upper stator (31). And an oil catching member (81) having a mesh-like mesh member (81b) provided between the plate-like member (81a) and the upper stator (31). The plate-like member (81a) is formed so that its outer shape is larger than that of the communication path (70) in plan view, and forms the upper surface of the communication path (70). On the other hand, the mesh member (81b) is provided so as to block between the plate-like member (81a) and the upper surface of the upper stator (31). In the first embodiment, the plate member (81a) and the mesh member (81b) are fixed, and the mesh member (81b) is welded to the upper surface of the upper stator (31) (the upper surface of the reinforcing plate (38)). Thus, the oil catching member (81) is fixed to the upper stator (31).

-Driving action-
Next, the operation of the compressor (10) according to the first embodiment will be described.

  When the motor (30) shown in FIG. 1 is energized, the rotor (32) rotates with respect to the upper stator (31), and the drive shaft (20) rotates accordingly. When the drive shaft (20) rotates, each eccentric part (26, 26) rotates eccentrically, and each piston (43a, 43b) rotates along the inner peripheral surface of each cylinder chamber (46a, 46b). .

  When the pistons (43a, 43b) rotate in this way, the refrigerant is sucked into the cylinder chambers (46a, 46b) from the suction pipes (15, 16). In each cylinder chamber (46a, 46b), the refrigerant is compressed by changing the volume of the space defined by the piston (43a, 43b) and the blade (45a, 45b). When the pressure of the refrigerant in the high-pressure side space exceeds a predetermined value, the reed valve (not shown) of each discharge port (19a, 19b) is opened, and the high-pressure refrigerant flows out from each discharge port (19a, 19b).

  The refrigerant flows out from the first discharge port (19a) to the second muffler chamber (62), while the refrigerant flows out from the second discharge port (19b) to the first muffler chamber (61). The refrigerant in the first muffler chamber (61) is divided into two refrigerant guide channels (C), and the refrigerant flowing through each refrigerant guide channel (C) is guided upward to be in the second muffler chamber (62). Flow into. In this way, in the second muffler chamber (62), the refrigerant discharged from the first rotary compression mechanism (41a) and the refrigerant discharged from the second rotary compression mechanism (41b) merge. The refrigerant combined in the second muffler chamber (62) is sent to the third muffler chamber (63) through the first outlet and flows out to the internal space (S1) through the second outlet. The refrigerant that has flowed into the internal space (S1) flows upward in the communication passage (70) that connects the upper space and the lower space of the motor (30), and then flows out of the casing (11) from the discharge pipe (17). Discharged.

  On the other hand, the lubricating oil in the oil reservoir (18) is pumped up to the oil supply passage (not shown) in the drive shaft (20) by the centrifugal pump (21) as the drive shaft (20) rotates, and the compression mechanism (40 ) And the sliding part of the motor (30).

  Here, a part of the lubricating oil supplied to the sliding portion of the compression mechanism (40) joins the flow of the discharged refrigerant without returning to the lower oil reservoir (18). On the other hand, the lubricating oil supplied to the motor (30) receives centrifugal force due to the rotation of the rotor (32), and is pushed out radially outward together with the refrigerant near the rotor (32) to flow through the communication path (70). Join the refrigerant. In this way, the refrigerant containing the lubricating oil enters the communication path (70).

  As described above, the refrigerant flowing upward in the communication path (70) contains the lubricating oil supplied to the sliding portions. Therefore, if no means for separating the lubricating oil from the refrigerant is taken, the lubricating oil is blown up together with the refrigerant from the communication path (70) above the motor (30) and discharged from the discharge pipe (17) together with the refrigerant, or It is separated from the refrigerant above the motor (30) and accumulates on the upper surface of the motor (30), making it difficult to return to the oil reservoir (18).

  However, the compressor (10) is provided with an oil separator (80). Therefore, the lubricating oil contained in the refrigerant flowing in the communication passage (70) collides with the plate-like member (81a) of the oil catching member (81) and is adsorbed on the plate-like member (81a) to be separated from the refrigerant. Is done. On the other hand, when the refrigerant collides with the plate-like member (81a), the flow direction is changed in the horizontal direction, passes through the mesh-like mesh member (81b), and reaches the space above the motor (30). In addition, also when a refrigerant | coolant passes a mesh member (81b), the lubricating oil in a refrigerant | coolant is isolate | separated from a refrigerant | coolant by adsorb | sucking to the structural part of a mesh member (81b).

  In this manner, the lubricating oil contained in the refrigerant flowing in the communication path (70) is separated from the refrigerant by the oil separator (80). Then, the separated lubricating oil falls along the inner surface of the casing and the outer peripheral surface of the motor (30) to the oil reservoir (18).

-Effect of Embodiment 1-
As described above, in this compressor (10), the oil separator (80) is provided in the communication path (70) formed between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (11). It has been. Thereby, the lubricating oil supplied to the compression mechanism (40) and the motor (30) can be separated from the discharged refrigerant in the communication path (70). Therefore, accumulation of lubricating oil on the upper surface of the motor (30) can be prevented, and the separated lubricating oil can be quickly returned to the oil reservoir (18) at the lower part of the casing (11). Therefore, in the compressor (10) provided with the axial gap motor, it is possible to prevent a shortage of lubricating oil in the oil reservoir (18).

  Further, according to the compressor (10), the oil capturing member (81) that captures the lubricating oil is disposed between the upper stator (31) and the casing (11) provided above the rotor (32). Is provided. That is, the oil catching member (81) is provided above the rotor (32). Therefore, not only the lubricating oil supplied to the compression mechanism (40) and entering the communication path (70), but also supplied to the motor (30) and pushed out to the communication path (70) by the centrifugal force generated by the rotation of the rotor (32). The obtained lubricating oil can also be captured by the oil capturing member (81).

  In the compressor (10), the oil catching member (81) has a plate-like member (81a) that forms the upper surface of the communication path (70). Therefore, the refrigerant flowing upward in the communication path (70) contacts the plate-like member (81a) that forms the upper surface of the communication path (70), and the distribution direction is horizontal (in this embodiment, the horizontal direction). On the other hand, the lubricating oil contained in the refrigerant contacts the plate-like member (81a) and is adsorbed. In this way, the lubricating oil can be easily separated from the refrigerant flowing through the communication path (70) with a simple configuration.

  Further, according to the compressor (10), the oil catching member (81) includes the mesh-like mesh member (81b) provided so as to close the space between the plate-like member (81a) and the upper stator (31). Have. Therefore, even when the refrigerant flowing through the communication path (70) passes through the mesh of the mesh member (81b), the lubricating oil in the refrigerant is adsorbed on the structural portion of the mesh member (81b) to capture the lubricating oil. be able to. Therefore, according to the compressor (10), the lubricating oil can be more reliably separated from the discharged refrigerant, so that the shortage of the lubricating oil in the oil reservoir (18) can be further prevented.

<< Embodiment 2 >>
The compressor (10) according to the second embodiment is obtained by modifying the oil capturing member (81) with respect to the compressor (10) of the first embodiment.

  Specifically, as shown in FIG. 4, the oil catching member (81) includes a horizontal portion (81ah) extending above the upper stator (31) and substantially parallel to the upper surface of the upper stator (31) and the horizontal portion. A plate-like member (81a) composed of a vertical portion (81av) extending vertically upward along the inner wall surface of the trunk portion (12) of the casing (11) from the outer edge of the portion (81ah); 81a) and a net-like mesh member (81b) provided between the horizontal portion (81ah) and the upper stator (31).

  The oil capturing member (81) is fixed to the upper stator (31) by welding and fixing the mesh member (81b) to the reinforcing plate (38). On the other hand, the oil catching member (81) is fixed to the casing (11) by welding and fixing the vertical portion (81av) of the plate-like member (81a) to the body portion (12) of the casing (11). In the second embodiment, the oil catching member (81) constitutes a welded portion for fixing the upper stator (31) to the casing (11). That is, the upper stator (31) is fixed to the casing (11) by welding the oil catching member (81) to the body (12) of the casing (11).

  Even with such a configuration, the same effects as those of the first embodiment can be obtained. Moreover, since the welding part and oil capture member (81) for fixing an upper stator (31) to a casing (11) can be comprised by one member, these can be formed easily, It can be easily attached to the casing (11).

  Further, the plate-like member (81a) of the oil catching member (81) of the compressor (10) has a vertical portion (81av) along the inner wall surface of the trunk portion (12) of the casing (11). The oil catching member (81) can be easily welded to the casing (11).

<< Embodiment 3 >>
The compressor (10) according to the third embodiment is different from the oil trapping member (81) in the communication passage (70) while deforming the oil trapping member (81) with respect to the compressor (10) of the second embodiment. An oil capturing member (91) is further provided.

  Specifically, as shown in FIG. 5, the plate-like member (81a) and the mesh member (81b) of the oil catching member (81) are both formed in an annular shape.

  Further, as shown in FIG. 6, the back yoke (35a) of the upper stator (31) is formed with a gap between the inner wall surface of the body (12) of the casing (11). It has a smaller diameter than the back yoke (35a). In the third embodiment, the core cut (35d) is not formed in the back yoke (35a). Further, the reinforcing plate (38) is formed so that the outer shape is equal to the back yoke (35a), and has a smaller diameter than that of the first embodiment.

  In Embodiment 3, the space between the outer peripheral surfaces of the back yoke (35a) and the reinforcing plate (38) and the inner wall surface of the body (12) of the casing (11), and the space outside the axial coil (36) Thus, a stator outer edge passage (71) that communicates the space on both sides in the axial direction of the upper stator (31) is formed.

  The point that the upper stator (31) is fixed to the casing (11) by welding the oil catching member (81) to the casing (11) is the same as in the second embodiment.

  In the third embodiment, the oil catching member (91) is also provided between the lower stator (33) and the body (12) of the casing (11).

  Specifically, the oil catching member (91) is provided between the stator core (33a) of the lower stator (33) and the casing (11). In the third embodiment, the stator core (33a) is formed so that the outer shape is equal to the back yoke (35a) of the upper stator (31), and has a smaller diameter than that of the first embodiment. Between the stator core (33a) and the inner wall surface of the body (12) of the casing (11), an annular stator outer edge passage (73) that communicates the space on both axial sides of the lower stator (33). The oil catching member (91) is provided in the stator outer edge passage (73).

  The oil catching member (91) includes a mesh member (92) formed in the same shape (donut plate shape) as the planar shape of the stator outer edge passage (73). The mesh member (92) is provided to span the stator outer edge passage (73).

  The mesh member (92) is welded and fixed to the stator core (33a) of the lower stator (33) and is also welded and fixed to the body (12) of the casing (11). Thereby, the oil capture member (91) constitutes a welded portion of the lower stator (33). That is, the lower stator (33) is attached to the casing (11) by welding the mesh member (92) of the oil catching member (91) to the body (12) of the casing (11).

  Even if comprised in this way, there can exist an effect similar to Embodiment 1. FIG.

  Further, according to the third embodiment, since both the stators (31, 33) are fixed to the casing (11) by the oil catching members (81, 91), a welded portion is separately formed on the stator (31, 33) itself. There is no need to do. Therefore, the stator outer edge passage (71), the rotor outer edge passage (72), and the stator outer edge passage (73) can be formed over the entire circumference, and are formed across these passages (71, 72, 73). A communication path (70) for communicating the upper space and the lower space of the motor (30) can be formed on the outer peripheral side of the motor (30) over the entire circumference. Thereby, the passage cross-sectional area of the communication passage (70) can be enlarged, and the flow rate of the refrigerant flowing through the communication passage (70) can be suppressed. Therefore, the lubricating oil trapped by the oil trapping member (81, 91) does not flow backward due to the refrigerant flow in the communication passage (70), but smoothly falls downward due to gravity to the oil reservoir (18). Can be returned.

<< Embodiment 4 >>
The compressor (10) according to the fourth embodiment is the same as the compressor (10) of the third embodiment except that the plate-like member of the oil catching member (81) provided between the upper stator (31) and the casing (11) ( 81a) and the shape of the mesh member (81b) are changed.

  Specifically, as shown in FIG. 7, the plate-like member (81a) of the oil catching member (81) of the fourth embodiment is configured by an annular curved plate. On the other hand, the mesh member (81b) is configured to cover the opening of the communication passage (70) formed above the upper stator (31) by the plate-like member (81a).

  According to the compressor (10) of the fourth embodiment, since the plate-like member (81a) is formed of a curved plate, the contact area between the refrigerant flowing through the communication path (70) and the plate-like member (81a) is small. It becomes larger than the case of the third embodiment. Therefore, the lubricating oil in the refrigerant is easily adsorbed by the plate-like member (81a) and is easily captured. Therefore, according to the fourth embodiment, the lubricating oil in the refrigerant can be more reliably separated from the refrigerant in the communication path (70).

<< Embodiment 5 >>
The compressor (10) according to the fifth embodiment is the same as the compressor (10) according to the fourth embodiment except that the plate-like member of the oil catching member (81) provided between the upper stator (31) and the casing (11) ( 81a) and the shape of the mesh member (81b) are changed.

  Specifically, as shown in FIG. 8, the plate-like member (81a) of the oil catching member (81) of Embodiment 5 is configured by an annular bent plate. On the other hand, the mesh member (81b) is configured to cover the opening of the communication passage (70) formed above the upper stator (31) by the plate-like member (81a).

  Even with such a configuration, the same effects as in the fourth embodiment can be obtained.

Embodiment 6
The compressor (10) according to the sixth embodiment is the same as the compressor (10) of the fourth embodiment except that the plate-like member of the oil catching member (81) provided between the upper stator (31) and the casing (11) ( 81a) and the shape of the mesh member (81b) are changed.

  Specifically, as shown in FIG. 9, the plate-like member (81a) of the oil catching member (81) of Embodiment 6 is constituted by a plurality of plate-like pieces provided on the outer peripheral portion of the upper stator (31). Has been. On the other hand, the mesh member (81b) is formed in a cylindrical shape, and is welded and fixed to the upper surface of the reinforcing plate (38). The plurality of plate-like pieces constituting the plate-like member (81a) have one end portion in the circumferential direction positioned above the other end portion, and adjacent plate-like pieces as viewed from the axial direction of the drive shaft (20). Each is provided to overlap. The plurality of plate-like pieces are respectively fixed to the outer peripheral surface of the cylindrical mesh member (81b) and connected by the mesh member (81b).

  With such a configuration, when the refrigerant flowing upward through the communication path (70) collides with the plurality of plate-like pieces constituting the plate-like member (81a), the lubricating oil in the refrigerant is removed from the plate-like piece. The lubricating oil is separated from the refrigerant by adsorbing to the refrigerant. Therefore, the compressor (10) of the sixth embodiment can achieve the same effects as those of the fourth embodiment.

<< Embodiment 7 >>
In the compressor (10) according to the seventh embodiment, the through hole (31a) is formed in the center portion of the upper stator (31) with respect to the compressor (10) of the fourth embodiment, and is separated from the refrigerant by the oil separator (80). The lubricating oil that could not be separated is returned from the through hole (31a) to the communication path (70).

  Specifically, as shown in FIG. 10, a through hole (38b) having a planar shape equal to the hole in the central portion of the back yoke (35a) is formed in the central portion of the reinforcing plate (38) of the upper stator (31). Has been. As a result, a through hole (31a) that penetrates the upper stator (31) in the vertical direction is formed in the central portion of the upper stator (31) by the through hole (38b) of the reinforcing plate (38) and the central hole of the back yoke (35a). ) Is formed. Further, the upper surface of the reinforcing plate (38) constituting the upper surface of the upper stator (31) is formed in a mortar shape so as to incline downward from the outer peripheral edge toward the through hole (38b) in the central portion.

  With such a configuration, a part of the lubricating oil contained in the refrigerant in the communication passage (70) is not captured by the oil capturing member (81), and the upper surface of the upper stator (31) (the upper surface of the reinforcing plate (38)). Since the upper surface of the upper stator (31) is formed in a mortar shape, the lubricating oil flows toward the center, and from the through hole (31a) formed in the center, the lower rotor ( It will fall toward 32). The lubricating oil that has reached the rotor (32) is subjected to the centrifugal force generated by the rotation of the rotor (32), and is pushed out radially together with the refrigerant in the vicinity of the rotor (32), and joins the refrigerant in the communication passage (70) again. To do.

  As described above, according to the compressor (10) of the seventh embodiment, by configuring the upper stator (31) as described above, lubricating oil that has not been captured by the oil capturing member (81) can be removed. ) Through the through hole (31a). That is, the lubricating oil not captured by the oil capturing member (81) is circulated between the through hole (31a) of the upper stator (31) and the communication path (70), so that the oil capturing member (81 ). Thereby, it is possible to prevent the lubricating oil from accumulating on the upper surface of the upper stator (31) and to capture the lubricating oil more reliably and return it to the oil reservoir (18).

  In the seventh embodiment, an example in which the upper stator (31) of the compressor (10) of the fourth embodiment is modified has been described as an example. However, embodiments other than the fourth embodiment (the first to third and fifth to sixth embodiments) are described. Of course, the same effect can be obtained even if the upper stator (31) of the compressor (10) of the following embodiment 8) is modified in this way.

Embodiment 8
In the compressor (10) according to the eighth embodiment, the oil separator (80) includes the oil catching member (81) and the plurality of projecting members (82) with respect to the compressor (10) of the first embodiment. is there.

  Specifically, as shown in FIG. 11A, the oil separator (80) includes a plurality of projecting members (82) projecting from the wall surface forming the communication path (70) to the communication path (70). ing. More specifically, each projecting member (82) is constituted by a plate-like piece, and is perpendicular to the inner wall surface of the body (12) of the casing (11) and the lower surface of the plate-like member (81a). It is provided to extend in any direction.

  With such a configuration, the lubricating oil contained in the refrigerant flowing in the communication passage (70) and the wall surface (the inner wall surface of the trunk portion (12) of the casing (11) and the plate member (81a) forming the communication passage (70). The frictional force generated between the lower surface and the lower surface is increased. Therefore, the lubricating oil contained in the refrigerant in the communication path (70) is easily adsorbed to the wall surface forming the communication path (70). Thereby, the lubricating oil in the refrigerant can be captured not only by the oil capturing member (81) but also by the wall surface of the communication path (70). Therefore, the lubricating oil can be more reliably separated from the refrigerant in the communication path (70), and can be quickly returned to the oil reservoir (18).

  In addition, the said protrusion member (82) may be comprised not only the above-mentioned plate-shaped piece but by the needle-shaped member, and may be comprised by the hemisphere as shown in FIG.11 (B). .

<Modification of oil catching member>
The oil catching member (81) is not limited to those in the above embodiments, and may be in the following forms.

  For example, as shown as Modification 1 in FIG. 12, the plate-like member (81a) of the oil capturing member (81) may be provided so as to be inclined with respect to the upper surface of the reinforcing plate (38). Moreover, as shown as a modified example 2 in FIG. 13, the plate-like member (81a) may be formed of a curved plate. Moreover, as shown as the modification 3 in FIG. 14, you may form a plate-shaped member (81a) in the shape of a folded plate whose longitudinal section is L-shaped.

  Further, as shown in FIG. 15 as a fourth modification, the oil capturing member (81) includes a plate-like member (81a) and a mesh member (81b) configured by curved plates, and the plate-like member (81a) The mesh member (81b) may be configured to form a part of the upper surface of the communication path (70) while being fixed to the reinforcing plate (38). Even in such a configuration, the lubricating oil in the refrigerant flowing through the communication path (70) contacts the plate member (81a) together with the refrigerant and is adsorbed on the plate member (81a). The refrigerant flowing through the communication path (70) passes through the mesh portion of the mesh member (81b), while the lubricating oil is adsorbed on the structure portion of the mesh member (81b) and separated from the refrigerant. Therefore, the lubricating oil can be separated from the refrigerant in the communication path (70) even in such a form.

  In addition, as shown as Modification 5 in FIG. 16, the oil catching member (81) includes a plate-like member (81a) and a mesh member (81b) connected to the plate-like member (81a). A plurality of passages (70) may be provided.

  Further, as shown as a sixth modification in FIG. 17 and as a seventh modification in FIG. 18, the oil capturing member (81) may be configured only by the mesh member (81b). Even in such a configuration, the lubricating oil in the communication path (70) is separated from the refrigerant by adsorbing to the structural portion of the mesh member (81b), and returns to the oil reservoir (18).

<Other embodiments>
In each of the above embodiments, as shown in FIG. 19, the body (12) of the casing (11) may be formed such that the portion corresponding to the motor (30) has a larger diameter than the other portions.

  In this way, by forming a portion corresponding to the motor (30) of the casing (11) with a large diameter, a wide communication path (on the outer peripheral side of the motor (30) (without reducing the diameter of the motor (30)) 70) can be formed.

  By the way, if the passage cross-sectional area of the communication passage (70) is small, the flow velocity of the refrigerant flowing through the communication passage (70) increases, and the lubricating oil separated by the oil separator (80) goes against the refrigerant flow. It becomes difficult to return to the oil sump (18). However, in the motor (30) of the compressor (10), the plurality of windings included in the upper stator (31) are configured by an axial coil (36) in which magnetic flux is formed in the direction of the drive shaft (20). . Therefore, if the diameter of the motor (30) is reduced in order to widen the passage width of the communication passage (70), the winding area is reduced and the efficiency is lowered.

  Therefore, as described above, the portion of the casing (11) corresponding to the motor (30) is formed to have a larger diameter than the other portions, thereby reducing the diameter of the motor (30) without reducing the diameter of the motor (30). A wide communication path (70) can be formed on the outer peripheral side. Moreover, the enlargement of the whole compressor (10) can be suppressed by forming only the part corresponding to the motor (30) of the casing (11) with a large diameter. Therefore, it is possible to provide a compressor that can more reliably separate the lubricating oil from the refrigerant and prevent a shortage of the lubricating oil in the oil reservoir (18) without reducing the efficiency of the motor (30).

  Further, in each of the above embodiments, in the case where the oil catching member (81) is constituted by the plate-like member (81a) and the mesh member (81b), the mesh member (81b) is omitted and a simple refrigerant flows. You may comprise so that it may become an opening which carries out. Even in such a case, the lubricating oil can be separated from the refrigerant by the lubricating oil colliding with and adsorbing on the plate-like member (81a).

  Moreover, in each said embodiment, the motor (30) was provided with the two stators (31, 33). However, the motor (30) may have only one stator. In each of the above embodiments, the motor (30) is configured as a winding stator in which only the upper stator (31) includes a plurality of axial coils (36), but the lower stator (33) is also wound in the same manner. The wire stator may be configured. Further, only the lower stator (33) may be configured as a wound stator.

  In each of the above embodiments, the compression mechanism (40) is not limited to a rotary compression mechanism, and may be another rotary compression mechanism such as a scroll type.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention relates to a compressor, and is particularly useful for a compressor provided with an axial gap motor.

10 Compressor
11 Casing
18 Oil reservoir
20 Drive shaft
30 motor
31 Upper stator (first stator)
31a Through hole
32 rotor
33 Lower stator (second stator)
36 Axial coil (winding)
40 Compression mechanism
70 communication path (refrigerant path)
80 Oil separator (oil separation means)
81 Oil capture member
81a Plate member
82 Protruding member
91 Oil catching member (second oil catching member)

Claims (10)

A casing (11) having an oil reservoir (18) for storing lubricating oil supplied to each sliding portion at the bottom, a drive shaft (20) extending vertically in the casing (11), A disk-shaped rotor (32) fixed to the drive shaft (20) and a disk-shaped first stator (31) fixed to the casing (11) face each other in the axial direction of the drive shaft (20). And a compression mechanism (40) that is attached below the motor (30) of the drive shaft (20) in the casing (11) and compresses the refrigerant. And
A refrigerant passage (70) through which the refrigerant discharged from the compression mechanism (40) flows upward is formed between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (11). on the other hand,
The compressor characterized in that the refrigerant passage (70) is provided with oil separation means (80) for separating the lubricating oil contained in the refrigerant from the refrigerant. In claim 1,
The first stator (31) is provided above the rotor (32),
The oil separating means (80) extends between the first stator (31) and the casing (11) in a direction intersecting the refrigerant passage (70) to remove lubricating oil in the refrigerant passage (70). A compressor comprising an oil catching member (81) for catching. In claim 2,
One end of the oil catching member (81) is fixed to the first stator (31), and the other end is welded to the casing (11) to attach the first stator (31) to the casing (11). And a welded portion of the first stator (31) to be fixed to the compressor. In claim 3,
The compressor characterized in that the refrigerant passage (70) is formed over the entire circumference of the motor (30). In any one of Claims 2 thru | or 4,
The first stator (31) is formed in a mortar shape so that a through-hole (31a) penetrating vertically is formed at the center, and an upper surface is inclined downward from the outer peripheral edge toward the through-hole (31a). The compressor characterized by being made. In claim 2,
The compressor, wherein the oil catching member (81) has a plate-like member (81a) that forms an upper surface of the refrigerant passage (70). In claim 6,
The compressor characterized in that the plate-like member (81a) is constituted by a curved plate or a bent plate. In claim 6,
The compressor characterized in that the oil separating means (80) includes a plurality of projecting members (82) projecting into the refrigerant passage (70) from a wall surface forming the refrigerant passage (70). Any one of claims 2 to 8,
The motor (30) further includes a disk-shaped second stator (33) facing the rotor (32) below the rotor (32),
The oil separating means (80) extends between the second stator (33) and the casing (11) in a direction intersecting the refrigerant passage (70) to remove lubricating oil in the refrigerant passage (70). A compressor comprising a second oil capturing member (91) for capturing. In claim 9,
At least one of the first stator (31) and the second stator (33) includes a plurality of windings (36) in which magnetic flux is formed in a direction parallel to the drive shaft (20),
The compressor according to claim 1, wherein the casing (11) is formed such that a portion corresponding to the motor (30) has a larger diameter than at least a portion corresponding to the compression mechanism (40).

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