JP7235855B2 - compressor - Google Patents

Description

The present invention relates to compressors.

As a vertical compressor, there is a compressor disclosed in Patent Document 1, for example.
A compressor disclosed in Patent Document 1 includes a housing, a rotary compression section, a scroll compression section, a motor, and an oil drain pipe.

The housing extends vertically. A rotary compression section is located at the bottom within the housing. The scroll compression section is located at the top within the housing.
The motor has a motor stator and a motor rotor. The motor stator is formed with stator cuts for returning oil downward.

The drain pipe is arranged above the motor stator. A drain pipe returns oil from the top of the housing to the bottom through the stator cut. The lower end of the drain pipe is positioned away from the upper end of the stator cut.

JP 2013-24153 A

As described above, the lower end of the oil drain pipe is positioned away from the upper end of the stator cut. Therefore, in the compressor disclosed in Patent Document 1, it is difficult to efficiently guide the oil from the lower end of the oil drain pipe to the upper end of the stator cut. This can make it difficult to efficiently return oil that has moved to the top of the housing back to the bottom of the housing.

Further, in the case of the compressor disclosed in Patent Document 1, since the rotary compression section immersed in oil is arranged below the motor, when the rotary compression section is driven, the compressed refrigerant and the oil flow into the housing. led to the top.
For this reason, the oil flowing out from the lower end of the oil drain pipe comes into contact with the refrigerant moving upward, and is less likely to move downward. This can make it more difficult to efficiently return oil that has migrated to the top of the housing back to the bottom of the housing.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a compressor capable of efficiently returning oil that has moved to the top of the housing to the bottom of the housing.

In order to solve the above-described problems, according to a compressor according to an aspect of the present invention, there is provided a housing in which an oil reservoir extending in the vertical direction and formed by accumulating oil at the bottom is arranged; a rotating shaft that extends in the vertical direction and rotates around the axis; a motor rotor that is provided on the outer peripheral surface of the rotating shaft and rotates together with the rotating shaft; and an inner periphery of the housing that surrounds the motor rotor from the outer peripheral side a motor having a motor stator provided on a surface; a compression mechanism housed in the housing and driven by the motor to compress refrigerant; 1 oil return path, wherein the first oil return path includes an oil return path main body provided in the housing and extending in the vertical direction, and a lower end of the oil return path main body formed in the housing. and an oil outlet for communicating with the bottom of the housing. The housing includes a tubular housing body extending in the vertical direction and having open ends at both ends, and an upper end side of the housing body. The housing body has an upper lid portion that closes the open end located thereon, and a lower lid portion that closes the open end located on the lower end side of the housing body. and the first oil return path is formed in the thick portion.

According to the present invention, an oil return path main body provided in the housing and extending in the vertical direction, and an oil outlet portion formed in the housing main body for communicating the lower end of the oil return path main body and the bottom portion in the housing, By providing the first oil return path that guides the oil that has moved to the upper part of the housing to the bottom part of the housing, contact between the oil flowing through the first oil return path and the oil flowing out from the oil outlet and the refrigerant is suppressed. becomes possible.
As a result, it is possible to prevent the refrigerant from interfering with the movement of the oil from the top to the bottom inside the housing, so that the oil collected from the top inside the housing can be efficiently returned to the bottom inside the housing.
In addition, by forming a thick portion extending in the vertical direction in the housing body and having a thickness that is greater in the radial direction than other portions, the oil return passage body can be provided inside the housing body and the oil outlet can be provided. A portion can be formed in the housing body.

Further, in the compressor according to the aspect of the present invention, the upper end of the oil return path main body is exposed from the upper end surface of the housing main body, and the upper lid portion is at least one of the upper ends of the oil return path main body. You may arrange|position so that a part may be exposed.

By arranging the upper cover portion so as to expose at least a portion of the upper end of the oil return path main body in this way, the oil that has moved to the upper part in the housing can be recovered from the upper end of the oil return path main body.

Further, the compressor according to the aspect of the present invention includes a radial bearing portion that is housed in the housing and rotatably supports an upper portion of the rotating shaft, wherein the radial bearing portion supports the upper portion of the rotating shaft. A bearing main body rotatably supported, and a support portion supporting the bearing main body and arranged so as to block the upper end of the oil return path main body, and facing the upper lid portion of the support portion A concave portion recessed in a direction from the upper lid portion toward the lower lid portion is formed on the side facing the lower lid portion, and a portion of the rotating shaft is inserted into the side of the support portion facing the lower lid portion. A through hole communicating with the recess may be formed, and the support portion may be formed with a second oil return path communicating between the recess and an upper end of the oil return path main body.

In this way, by forming the second oil return path that communicates the recess with the upper end of the oil return path main body in the support portion, the oil present in the recess is discharged via the first and second oil return paths. can be efficiently returned to the bottom of the housing.

Further, in the compressor according to the aspect of the present invention, the second oil return path includes a first path portion radially penetrating the support portion, and the support portion in the vertical direction. a second path portion formed in a portion located between the first path portion and the upper end of the oil return path body, and communicating the first path portion and the upper end of the oil return path body; may have.

Since the second oil return path has the first and second path portions configured in this way, the oil present in the recess can be guided to the upper end of the oil return path main body.
Moreover, the first path portion can be easily formed by making the shape of the first path portion radially penetrating through the support portion.

Further, the compressor according to the aspect of the present invention may further include a lid portion that closes the radially outer end portion of the two end portions of the first path portion.

In this way, by having the cover portion that closes the radially outer end portion of the two ends of the first path portion, the radial bearing portion can be connected via the radially outer end portion. It is possible to suppress the oil from flowing out to the outside.

Further, in the compressor according to the aspect of the present invention, the oil outlet portion may be recessed radially outward from a position where the oil return path main body is formed.
Further, according to the compressor according to one aspect of the present invention, the housing extends in the vertical direction and is provided with an oil reservoir formed by accumulating oil at the bottom; a rotating shaft that extends and rotates around an axis; a motor rotor that is provided on the outer peripheral surface of the rotating shaft and rotates together with the rotating shaft; and a motor rotor that is provided on the inner peripheral surface of the housing so as to surround the motor rotor from the outer peripheral side. a motor having a motor stator; a compression mechanism housed in the housing and driven by the motor to compress refrigerant; and a first oil return path guiding the oil that has moved to the top of the housing to the bottom. and, the first oil return path includes: an oil return path main body provided in the housing and extending in the vertical direction; and an oil outlet portion communicating with the bottom portion, the oil outlet portion being recessed radially outward from a position where the oil return path main body is formed.

In this way, by forming the oil outlet so as to be recessed radially outward from the position where the oil return path main body is formed, it is possible to increase the volume of the oil outlet. As a result, the oil can be easily led from the oil outlet to the bottom inside the housing.

Further, in the compressor according to the aspect of the present invention, the compression mechanism includes a rotary compression section that is arranged below the motor and compresses the refrigerant while being immersed in the oil reservoir, and a rotary compression section that is arranged above the motor. a scroll compression section arranged to compress the refrigerant compressed by the rotary compression section, wherein the rotating shaft extends in the vertical direction and passes through the rotary compression section; and an eccentric shaft portion that is provided at the upper end of the rotating shaft main body and that orbits the orbiting scroll that constitutes the scroll compressing portion.

In this way, when the rotary compression section is arranged below the motor and the scroll compression section is arranged above the motor and further compresses the refrigerant compressed by the rotary compression section, the refrigerant compressed by the rotary compression section is provided. A flow of refrigerant is established in a direction from the bottom to the top of the housing to supply the scroll compression.

On the other hand, the oil return path main body is provided inside the housing main body, and the oil outlet portion is immersed in an oil reservoir arranged at the bottom of the housing. Therefore, it is possible to prevent the oil flowing through the first oil return path from coming into contact with the flow of the refrigerant.
As a result, it is possible to prevent the oil flowing through the first oil return path from moving in the direction toward the bottom of the housing due to the influence of the flow of the refrigerant. can be returned.

In the compressor according to the aspect of the present invention, a sight glass may be provided in the housing for observing the state of the oil return path main body from the outside of the housing.

By having the sight glass configured in this manner, the operator can confirm whether or not the oil is flowing downward in the oil return path main body.
In addition, the operator can determine whether or not there is a problem with the oil return path main body located above the position where the sight glass is arranged.

According to the present invention, the oil that has moved to the upper part inside the housing can be efficiently returned to the bottom part inside the housing.

It is a sectional view showing typically a compressor concerning an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a portion surrounded by a region A in the compressor shown in FIG. 1; 2 is an enlarged cross-sectional view of a portion surrounded by a region B in the compressor shown in FIG. 1; FIG. FIG. 4 is a cross-sectional view showing another example of an oil outlet portion;

Embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

(embodiment)
A compressor 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.
In FIG. 1, _O1 indicates the axis of the rotary shaft main body 55 (hereinafter referred to as "axis _O1 "), and _O2 indicates the axis of the eccentric shaft portion 56 (hereinafter referred to as "axis _O2 ").
In FIG. 1, the X direction indicates the radial direction of the compressor 10, and the Z direction indicates the vertical direction perpendicular to the X direction.
In FIG. 1, a two-cylinder rotary compression section 78 is taken as an example of the rotary compression section.

The compressor 10 includes a housing 11, a rotating shaft 13, a lower bearing portion 15, an upper bearing portion 16, an oil pump 17, a radial bearing portion 21, a lid portion 22, a motor 23, and a compression mechanism 25. , a discharge valve 26 , a bushing assembly 27 , a thrust plate 29 , an Oldham ring 30 , a cover 31 , a discharge pipe 35 and a sight glass 36 .

The housing 11 has a semi-sealed structure. An oil reservoir 39 formed by accumulating oil 38 is arranged in the bottom portion 11A inside the housing 11 .
The housing 11 has a housing body 41 , a lower lid portion 42 and an upper lid portion 43 .

The housing body 41 is cylindrical and extends in the Z direction. The housing body 41 has open ends at both ends (upper end and lower end).
The housing body 41 has a thick portion 41A that extends in the Z direction and is thicker in the X direction (radial direction) than other portions. The housing body 41 can be manufactured by, for example, a casting method.
By manufacturing the housing body 41 using the casting method in this manner, the thick portion 41A can be easily formed.

A first oil return path 45 and a mounting hole 46 are formed in the thick portion 41A of the housing body 41 .
The first oil return path 45 is a path for guiding the oil that has moved to the upper part inside the housing 11 to the bottom part 11</b>A inside the housing 11 .

The first oil return path 45 has an oil return path body 51 and an oil outlet portion 52 .
The oil return path main body 51 is provided inside the thick portion 41A and extends in the Z direction. The oil return path main body 51 has an upper end 51A arranged on the upper lid portion 43 side and a lower end 51B arranged on the lower lid portion 42 side.

The upper end 51A is exposed from the upper end surface 41Aa of the thick portion 41A (part of the upper end surface 41a of the housing main body 41). The lower end 51B is arranged within the thick portion 41A.
The oil return path main body 51 configured as described above is a path for guiding the oil that has moved to the upper part in the housing 11 to the bottom part 11A in the housing 11 .

The oil outlet portion 52 is formed in the thick portion 41A located directly below the lower end 51B of the oil return path main body 51. As shown in FIG.
The oil outlet portion 52 is exposed from the inner peripheral surface of the thick portion 41A. The oil outlet portion 52 extends radially outward from the inner peripheral surface of the thick portion 41A. The oil outlet portion 52 allows the lower end 51B of the oil return path main body 51 and the bottom portion 11A in the housing 11 to communicate with each other.
The oil that has passed through the oil return path main body 51 is returned to the bottom portion 11A inside the housing 11 via the oil outlet portion 52 .

The oil outlet portion 52 constitutes the compression mechanism 25 and is arranged below the upper end surface of the two-cylinder rotary compression portion 78 arranged below the liquid surface 39 a of the oil reservoir 39 . As a result, the oil outlet portion 52 is covered with the oil 38 forming the oil reservoir 39 .

The oil outlet portion 52 may be recessed radially outward from the position where the oil return path main body 51 is formed.

Thus, by forming the oil outlet portion 52 so as to be recessed radially outward from the position where the oil return path main body 51 is formed, it is possible to increase the volume of the oil outlet portion 52 . Thereby, the oil can be easily guided from the oil outlet portion 52 to the bottom portion 11</b>A inside the housing 11 .

The lower lid portion 42 is provided on the housing body 41 so as to close the open end located on the lower end side of the housing body 41 .

The upper lid portion 43 is provided on the housing body 41 so as to close the open end located on the upper end side of the housing body 41 .

The rotating shaft 13 is accommodated in the housing 11 while extending in the Z direction. The rotating shaft 13 has a rotating shaft main body 55 and an eccentric shaft portion 56 .
The rotary shaft main body 55 is cylindrical and rotates around the axis _O1 . The rotary shaft main body 55 has an upper end portion 55A and a lower end portion 55B. The lower end portion 55B penetrates the two-cylinder rotary compression portion 78 in the Z direction.
The rotating shaft main body 55 configured as described above is rotatably supported by the lower bearing portion 15 , the upper bearing portion 16 , and the radial bearing portion 21 .

The eccentric shaft portion 56 is provided at the upper end of the rotating shaft main body 55 . The eccentric shaft portion 56 has an axis line _O2 offset (eccentrically) with respect to the axis line _O1 as a central axis. The eccentric shaft portion 56 is a cylindrical shaft smaller than the outer diameter of the rotating shaft main body 55 .
The eccentric shaft portion 56 configured as described above revolves around the axis O ₁ when the rotary shaft main body 55 rotates around the axis O ₁ , thereby turning the orbiting scroll 86 constituting the scroll compression portion 79 .

The lower bearing portion 15 is arranged below the two-cylinder rotary compression portion 78 . The upper bearing portion 16 is arranged above the two-cylinder rotary compression portion 78 .
That is, the lower bearing portion 15 and the upper bearing portion 16 are arranged so as to sandwich the two-cylinder rotary compression portion 78 from above and below.

The oil supply pump 17 is provided inside the lower bearing portion 15 . The oil supply pump 17 supplies part of the oil 38 accumulated in the bottom portion 11</b>A inside the housing 11 to the scroll compression portion 79 through a through hole (not shown) formed in the rotating shaft 13 .

The motor 23 is contained within the housing 11 and has a motor rotor 58 and a motor stator 59 .
The motor rotor 58 is fixed to the outer peripheral surface located in the intermediate region of the rotary shaft main body 55 in the Z direction. The motor stator 59 is fixed to the inner peripheral surface of the housing body 41 .
The motor 23 configured as described above drives the two-cylinder rotary compression section 78 and the scroll compression section 79 via the rotary shaft 13 .

The radial bearing portion 21 has a support portion 61 and a bearing body 62 .
The support portion 61 is a member that supports the bearing main body 62 and is housed inside the housing 11 . The support portion 61 is fixed to the housing body 41 while being in contact with the inner portion of the upper end surface 41 a of the housing body 41 .
A concave portion 64 , a through hole 65 , and a second oil return path 66 are formed in the support portion 61 .

The recess 64 is formed in the central portion of the upper side of the support portion 61 facing the upper lid portion 43 . The concave portion 64 is recessed in a direction from the upper lid portion 43 toward the lower lid portion 42 . The recess 64 is a columnar space.

The through hole 65 is formed in the central portion of the lower side of the support portion 61 facing the lower lid portion 42 . The upper end side of the through hole 65 communicates with the recess 64 . The through hole 65 is a cylindrical hole. The opening diameter of the through hole 65 is smaller than the opening diameter of the recess 64 . An upper end portion 55A of the rotating shaft main body 55 is arranged in the through hole 65 .

The second oil return path 66 is provided inside the support portion 61 . The second oil return path 66 has a first path portion 71 and a second path portion 72 .

The first path portion 71 is a support portion positioned radially outward of the recess 64 so that a portion of the radially outer side of the first path portion 71 is arranged above the upper end 51A of the oil return path main body 51. It is formed by penetrating 61 in the radial direction.
In this way, the first path portion 71 can be easily formed by making the shape of the first path portion 71 radially penetrate through the support portion 61 .

The first path portion 71 has an end portion 71A arranged radially inward and communicating with the recess 64, and an end portion 71B arranged radially outward.
A female screw portion 71C is formed on the inner peripheral surface of the end portion 71B. The end portion 71B is closed by the lid portion 22 .
The first path portion 71 configured as described above guides the oil present in the recess 64 to the radially outer side of the support portion 61 .

The second path portion 72 is formed extending in the Z direction in a portion of the support portion 61 located between the first path portion 71 and the upper end 51A of the oil return path main body 51 in the Z direction. .
The second path portion 72 communicates the first path portion 71 and the upper end 51A of the oil return path main body 51 .

By providing the second oil return path 66 having the first and second path portions 71 and 72 configured as described above, the oil present in the recess 64 is guided to the upper end 51A of the oil return path main body 51. be able to.

By providing the oil return path main body 51 and the first oil return path 45 having the oil outlet 52, the oil flowing through the first oil return path 45 and the oil flowing out from the oil outlet 52 come into contact with the refrigerant. Since it is no longer necessary to do so, it is no longer adversely affected by the refrigerant. As a result, the oil collected from the upper portion inside the housing 11 can be efficiently returned to the bottom portion 11A inside the housing 11 .

In the case of the structure shown in FIG. 1, it is necessary to form the second oil return path 66 described above. (not shown) is formed to collect the oil located below the radial bearing portion 21, the second oil return path 66 need not be formed.
That is, the second oil return path 66 may be appropriately formed according to the structure of the compressor to which the first oil return path 45 is applied.

The bearing main body 62 is provided on the surface of the support portion 61 that defines the through hole 65 . The bearing main body 62 faces the outer peripheral surface of the upper end portion 55A of the rotating shaft main body 55 . The bearing main body 62 supports the rotating shaft main body 55 in the radial direction in a rotatable state.

The lid portion 22 is a set screw 75, which is fastened to the internal thread portion 71C formed at the end portion 71B. The lid portion 22 is a member for covering the end portion 71B.
Thus, by having the cover portion 22 that closes the radially outer end portion 71B of the two ends 71A and 71B of the first path portion 71, the radial bearing portion Oil can be suppressed from flowing out to the outside of 21 .

In FIG. 2, the set screw 75 has been described as an example of the lid portion 22, but instead of the set screw 75, another member (the lid portion ) may be used to close the end 71B.

The compression mechanism 25 has a two-cylinder rotary compression section 78 and a scroll compression section 79 .
The two-cylinder rotary compression section 78 is arranged at the bottom section 11A inside the housing 11 . The two-cylinder rotary compression section 78 is immersed in the oil reservoir 39 .

The two-cylinder rotary compression section 78 has a first rotary compression section 81 and a second rotary compression section 82 .

The first rotary compression section 81 and the second rotary compression section 82 are supplied with gas-phase refrigerant (hereinafter simply referred to as "refrigerant") from an accumulator (not shown) that separates refrigerant from gas and liquid. The 1st rotary compression part 81 and the 2nd rotary compression part 82 compress the refrigerant|coolant supplied from the accumulator.

The second rotary compression section 82 is stacked on the first rotary compression section 81 . The refrigerants compressed by the first rotary compression section 81 and the second rotary compression section 82 are supplied to the scroll compression section 79 arranged above the two-cylinder rotary compression section 78 .

The scroll compression part 79 is provided in the upper part inside the housing 11 and arranged between the cover 31 and the radial bearing part 21 .
The scroll compression section 79 has a fixed scroll 85 and an orbiting scroll 86 .

The fixed scroll 85 is arranged between the cover 31 and the orbiting scroll 86 . The fixed scroll 85 has an end plate 85A and a fixed wrap 85B.

The end plate 85A is disc-shaped. The end plate 85A is fixed on the radial bearing portion 21. As shown in FIG.
The end plate 85A has an upper surface, a lower surface, and a discharge port 85C. The discharge port 85C is formed extending in the Z direction so as to penetrate through the center of the end plate 85A.
The discharge port 85</b>C is a through hole for discharging the refrigerant compressed by the scroll compression portion 79 to the outside of the scroll compression portion 79 .
The fixing wrap 85B protrudes downward from the lower surface of the end plate 85A. The fixed wrap 85B is a wall formed in a spiral shape when viewed from the direction of the axis _O1 .

The orbiting scroll 86 is arranged between the fixed scroll 85 and the radial bearing portion 21 . The orbiting scroll 86 has an end plate 86A, an orbiting wrap 86B, and a boss portion 86C.

The end plate 86A is disc-shaped. The end plate 86A is arranged on the support portion 61 with the thrust plate 29 interposed therebetween. The end plate 86A is arranged to face the end plate 85A in the Z direction. The end plate 86A has an upper surface and a lower surface facing the upper surface of the end plate 85A.

The turning wrap 86B is provided on the upper surface of the end plate 86A and protrudes upward. The turning wrap 86B is a spirally formed wall body when viewed from the direction of the axis _O1 .
The orbiting wrap 86B configured as described above is arranged so as to mesh with the stationary wrap 85B. Thereby, a compression chamber for compressing the refrigerant is formed between the orbiting wrap 86B and the fixed wrap 85B. As the orbiting wrap 86B orbits with respect to the fixed scroll 85, the volume of the compression chamber changes and the refrigerant in the compression chamber is compressed.

The boss portion 86C is provided on the lower surface of the end plate 86A and protrudes downward. The boss portion 86</b>C is a member having a cylindrical shape, and the bottom side thereof is arranged inside the recess portion 64 .

As described above, the two-cylinder rotary compression section 78 arranged below the motor 23, and the scroll compression section 79 arranged above the motor 23 for further compressing the refrigerant compressed by the two-cylinder rotary compression section 78. , so that the refrigerant compressed by the two-cylinder rotary compressor 78 is supplied to the scroll compressor 79, a refrigerant flow is formed in the direction from the bottom 11A in the housing 11 toward the top.

As described above, the oil return path main body 51 is provided inside the thick wall portion 41A, and the oil outlet portion 52 is immersed in the oil reservoir 39 arranged at the bottom portion 11A inside the housing 11 . A second oil return path 66 that communicates with the oil return path main body 51 is provided inside the support portion 61 that constitutes the radial bearing portion 21 .

Therefore, the oil flowing through the first and second oil return paths 45 and 66 is suppressed from coming into contact with the flow of the refrigerant, and the oil flowing through the first and second oil return paths 45 and 66 is prevented from flowing into the housing 11. It is possible to suppress the difficulty of moving in the direction toward the bottom portion 11A. As a result, the oil that has moved to the upper portion within the housing 11 can be efficiently returned to the bottom portion 11A within the housing 11 .

The discharge valve 26 is provided on the upper surface of the end plate 86A. The discharge valve 26 is arranged at a position capable of opening and closing the discharge port 85C.

The bushing assembly 27 is provided between the orbiting scroll 86 and the rotating shaft 13 . The bushing assembly 27 connects the orbiting scroll 86 and the rotating shaft 13 . The bushing assembly 27 has a bushing 27A provided between the eccentric shaft portion 56 and the boss portion 86C.

Thrust plate 29 is provided between end plate 86A and radial bearing portion 21 . The thrust plate 29 is a member for holding a thrust load generated on the orbiting scroll 86 .

The Oldham ring 30 is provided between the end plate 86A and the end plate 85A. The Oldham ring 30 has projections that are fitted into grooves (not shown) formed in the end plates 86A and 85A. The Oldham ring 30 is a member for suppressing the rotation of the orbiting scroll 86 (rotation about the axis O2) and for converting the rotational motion of the rotating shaft main body 55 into orbital motion.

The cover 31 is accommodated in the housing 11 and provided on the upper surface of the end plate 85A. The cover 31 forms a discharge space 31A between the inner surface of the cover 31 and the upper surface of the end plate 85A.
When the discharge port 85C is opened by the discharge valve 26, the refrigerant compressed by the scroll compressor 79 is discharged into the discharge space 31A.

The discharge pipe 35 is provided in the housing 11 in communication with the discharge space 31A. The discharge pipe 35 discharges the refrigerant compressed by the compressor 10 to the outside of the compressor 10 .

The sight glass 36 is fixed to the thick portion 41</b>A while being mounted in the mounting hole 46 . The sight glass 36 is for observing the state of the oil return path main body 51 from the outside of the housing 11 .

By having the sight glass 36 configured as described above, the operator can confirm whether or not the oil is flowing downward in the oil return path main body 51 .
In addition, the operator can determine whether or not there is a problem with the oil return path main body 51 located above the position where the sight glass 36 is arranged.

According to the compressor 10 of the present embodiment, by having the above-described first and second oil return paths 45 and 66, via the second oil return path 66 and the first oil return path 45, Since the oil flowing out from the oil outlet portion 52 of the first oil return path 45 to the bottom portion 11A in the housing 11 does not come into contact with the refrigerant, it is possible to prevent the refrigerant from adversely affecting the recovery of the oil. As a result, the oil collected from the upper portion inside the housing 11 can be efficiently returned to the bottom portion 11A inside the housing 11 .

Here, another example of the first oil return path (first oil return path 91) will be described with reference to FIG. In FIG. 4, the same components as those of the structure shown in FIG. 3 are denoted by the same reference numerals.

The first oil return path 91 is configured in the same manner as the first oil return path 45 except that it has an oil outlet portion 92 instead of the oil outlet portion 52 that constitutes the first oil return path 45. there is
The oil outlet portion 92 is a flow path formed so as to be inclined obliquely downward from the lower end 51B of the oil return path main body 51 toward the oil reservoir 39 . The diameter of the oil outlet portion 92 can be, for example, greater than or equal to the diameter of the oil return path main body 51 .
The oil outlet portion 92 having such a configuration can obtain the same effect as the oil outlet portion 52 described above.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the invention described in the scope of the claims. Transformation and change are possible.

In the present embodiment, the two-cylinder rotary compression section 78 is used as an example of the rotary compression section, but a single-cylinder rotary compression section may be used instead. .
The first oil return paths 45 and 91 and the second oil return path 66 are also applicable to a compressor having either one of the two-cylinder rotary compression section 78 and the scroll compression section 79. It is possible.

The present invention is applicable to compressors.

REFERENCE SIGNS LIST 10 compressor 11 housing 11A bottom 13 rotating shaft 15 lower bearing 16 upper bearing 17 lubrication pump 21 radial bearing 22 lid 23 motor 25 compression mechanism 26 discharge valve 27 bush assembly 27A bush 29 thrust plate 30 Oldham ring 31 cover 31A Discharge space 35 Discharge pipe 36 Sight glass 38 Oil 39 Oil reservoir 41 Housing main body 41a, 41Aa Upper end surface 41A Thick portion 42 Lower lid portion 43 Upper lid portion 45, 91 First oil return path 46 Mounting hole 51 Oil return path main body 51A Upper end 51B Lower ends 52, 92 Oil outlet portion 55 Rotating shaft main body 55A Upper end portion 55B Lower end portion 56 Eccentric shaft portion 58 Motor rotor 59 Motor stator 61 Support portion 62 Bearing main body 64 Recessed portion 65 Through hole 66 Second oil return path 71 First Passage portion 71A, 71B End portion 71C Female screw portion 72 Second passage portion 75 Set screw 78 Two-stage rotary compression portion 79 Scroll compression portion 81 First rotary compression portion 82 Second rotary compression portion 85 Fixed scroll 85A, 86A End plate 85B Fixed wrap 85C Discharge port 86 Orbiting scroll 86B Orbiting wrap 86C Boss A, B Area _O1 , _O2 axes

Claims (9)

a housing extending in the vertical direction and having an oil reservoir formed by accumulating oil at the bottom;
a rotating shaft housed in the housing, extending in the vertical direction, and rotating about an axis;
a motor having a motor rotor provided on the outer peripheral surface of the rotating shaft and rotating together with the rotating shaft, and a motor stator provided on the inner peripheral surface of the housing so as to surround the motor rotor from the outer peripheral side;
a compression mechanism housed in the housing and driven by the motor to compress refrigerant;
a first oil return path that guides the oil that has moved to the upper part in the housing to the bottom part;
with
The first oil return path includes: an oil return path main body provided in the housing and extending in the vertical direction; and an oil outlet ,
The housing includes a cylindrical housing body that extends in the vertical direction and has open ends at both ends, an upper cover that closes the open ends located on the upper end side of the housing body, and a lower end side of the housing body. and a lower lid portion that closes the open end,
The housing body includes a thick portion extending in the vertical direction and having a thickness in a radial direction that is thicker than other portions,
The compressor , wherein the first oil return path is formed in the thick portion . The upper end of the oil return path main body is exposed from the upper end surface of the housing main body,
2. The compressor according to claim 1 , wherein the upper lid portion is arranged to expose at least a portion of the upper end of the oil return path main body. A radial bearing portion that is housed in the housing and rotatably supports the upper portion of the rotating shaft;
The radial bearing portion has a bearing body that rotatably supports an upper portion of the rotating shaft, and a support portion that supports the bearing body and is arranged to block the upper end of the oil return path body. and
A concave portion recessed in a direction from the upper lid portion toward the lower lid portion is formed on a side of the support portion facing the upper lid portion,
A through hole is formed in a side of the support portion facing the lower lid portion, into which a part of the rotating shaft is inserted and which communicates with the recess,
3. The compressor according to claim 2 , wherein the supporting portion is formed with a second oil return path that communicates between the recess and an upper end of the oil return path main body. The second oil return path includes a first path portion radially penetrating the support portion;
The support portion is formed in a portion positioned between the first path portion and the upper end of the oil return path body in the vertical direction, and is formed between the first path portion and the upper end of the oil return path body. a second path portion that communicates with
4. The compressor of claim 3 , comprising: 5. The compressor according to claim 4 , further comprising a lid portion that closes the radially outer end portion of the two end portions of the first path portion. 6. The compressor according to any one of claims 1 to 5 , wherein the oil outlet portion is recessed radially outward from a position where the oil return path main body is formed. a housing extending in the vertical direction and having an oil reservoir formed by accumulating oil at the bottom;
a rotating shaft housed in the housing, extending in the vertical direction, and rotating about an axis;
a motor having a motor rotor provided on the outer peripheral surface of the rotating shaft and rotating together with the rotating shaft, and a motor stator provided on the inner peripheral surface of the housing so as to surround the motor rotor from the outer peripheral side;
a compression mechanism housed in the housing and driven by the motor to compress refrigerant;
a first oil return path that guides the oil that has moved to the upper part in the housing to the bottom part;
with
The first oil return path includes: an oil return path main body provided in the housing and extending in the vertical direction; and an oil outlet,
The compressor, wherein the oil outlet portion is recessed radially outward from a position where the oil return path main body is formed. The compression mechanism includes a rotary compression section that is arranged below the motor and compresses the refrigerant while being immersed in the oil reservoir;
a scroll compression section disposed above the motor for compressing the refrigerant compressed by the rotary compression section;
and
The rotating shaft extends in the vertical direction and passes through the rotary compression section; an eccentric shaft section provided at an upper end of the rotating shaft body for rotating an orbiting scroll that constitutes the scroll compression section; 8. A compressor according to any one of claims 1 to 7, comprising: 9. The compressor according to any one of claims 1 to 8, further comprising a sight glass provided in said housing for observing the state of said oil return path main body from outside said housing.

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