JP2007315366A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor capable of fully preventing oil from flowing outside. <P>SOLUTION: In the compressor 100 provided with a housing (a hermetic vessel) 110, an electric motor part 120 housed in the housing, a compression mechanism part 130 driven by the electric motor part to compress refrigerant and discharging the compressed refrigerant into the housing, and a discharge pipe 111a guiding the discharged refrigerant in the housing to an outside of the housing, an oil separating means 150 is provided which separates lubricating oil contained in the refrigerant discharged in the housing 110, and the refrigerant having passed through the oil separating means 150 is guided to the inlet 111ao of the discharge pipe 111a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a compressor, and is suitable for application to a compressor using carbon dioxide (CO ₂ ) as a heat exchange medium, for example.

  Conventionally, as a compressor, a compression mechanism section that compresses a medium such as a refrigerant, an electric motor section that drives the compression mechanism section, a high-pressure medium that accommodates the compression mechanism section and the electric motor section, and is discharged from the compression mechanism section There is known a so-called high pressure shell type compressor provided with a compressor housing having a discharge pressure atmosphere (see Patent Document 1, etc.). On the other hand, there is a so-called low-pressure shell type compressor in which the inside of the compressor housing is an intake pressure atmosphere. In both compressors, in order to supply lubricating oil to the compression mechanism unit and the motor unit, a small amount of oil is mixed into the medium and sucked into and discharged from the compression mechanism unit.

  In a high-pressure shell type compressor, the medium and oil compressed to a high pressure are once discharged into the compression housing, so oil outflow to the outside is suppressed compared to the low-pressure shell type compressor, and the medium discharged from the compressor The oil ratio (oil rate) is relatively low.

  In the technique disclosed in Patent Document 1, the shielding plate is provided in the external discharge pipe in the compressor housing. In this technique, oil with high viscosity contained in the medium is adhered to the shielding plate, thereby separating the medium and the oil and preventing oil outflow.

The external discharge pipe extends from the upper part of the compressor housing to the outside, and an electric motor part is disposed in the upper part of the compressor housing and a compression mechanism part is disposed in the lower part.
JP 2006-46099 A

In recent years, it has been desired to increase the efficiency of heat exchange of refrigerant sucked and compressed by a compressor. For example, since the heat transfer efficiency by the evaporator and the condenser oil adhering to the inner surface of which constitutes a refrigerant circulation system comprising a compressor is reduced, in particular CO ₂ based medium, further in order to improve the heat transfer coefficient Oil There is a need for rate reduction.

  However, even in the prior art disclosed in Patent Document 1, the motor part is swung up by the rotation of the electric motor part, and it is structurally difficult to sufficiently prevent oil outflow.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a compressor capable of sufficiently preventing oil from flowing out to the outside.

  In order to achieve the above object, the present invention comprises the following technical means.

That is, in the invention according to claims 1 to 12, a housing, an electric motor unit accommodated in the housing, a compression mechanism unit that is driven by the electric motor unit to compress the refrigerant, and discharges the compressed refrigerant into the housing, In a compressor comprising a discharge pipe that guides the refrigerant discharged in the housing to the outside of the housing,
Oil separation means for separating the lubricating oil contained in the refrigerant discharged into the housing is provided, and the refrigerant that has passed through the oil separation means is guided to the inlet of the discharge pipe.

  Thus, even when the high-pressure refrigerant discharged from the compression mechanism in the housing is swung up by the rotation of the electric motor, the lubricating oil contained in the refrigerant is separated from the refrigerant by the oil separation means, and the oil is separated. Since the refrigerant that has passed through the means can be guided to the inlet of the discharge pipe, it is possible to sufficiently prevent oil from flowing out of the housing. Therefore, in the refrigerant circulation system including the compressor, it is possible to further reduce the oil rate discharged from the compressor.

  In particular, the invention according to claim 3 is characterized in that the oil separation means is a centrifugal oil separator.

  According to this, in addition to the separation due to the difference in density between the refrigerant and the lubricating oil in the housing and the separation due to the difference in viscosity between the refrigerant and the lubricating oil (adhesion difference), the refrigerant and the lubricating oil are centrifuged effectively. Lubricating oil contained in the refrigerant can be separated from the refrigerant.

Further, in the invention according to claim 4, the discharge pipe is provided with an external pipe that is attached to the housing and enables refrigerant circulation inside and outside the housing.
The pipe part inside the housing of the external piping is characterized by constituting a part of the oil separating means.

  As a result, the oil separation means can be easily accommodated with a relatively inexpensive structure.

Further, in the invention according to claim 5, the oil separating means is provided in the hollow body portion, which defines the inlet inside the housing of the discharge pipe and the inside of the housing, the hollow body portion inner periphery and the discharge pipe outer periphery A refrigerant inlet portion that forms a rotational flow between the oil outlet portion, an oil outlet portion that is provided in the hollow body portion and arranged vertically downward from the refrigerant inlet portion;
It is characterized by having.

  Thereby, the oil separation means can partition the inlet inside the housing of the discharge pipe and the inside of the housing, and can form a rotational flow of the refrigerant around the outer periphery of the discharge pipe. Therefore, the lubricating oil in the refrigerant can be centrifuged by the rotational flow of the refrigerant, and the separated lubricating oil can be recovered from the oil outlet.

  In the invention according to claim 6, the hollow body portion is formed in a cylindrical body surrounding the discharge pipe, and the refrigerant inlet portion is arranged in parallel to the tangential direction of the inner peripheral surface of the cylindrical body. It is characterized by being.

  According to this, it is preferable that the hollow body portion is formed in a cylindrical body that surrounds the discharge pipe, and the refrigerant inlet portion is disposed in parallel to the tangential direction of the inner peripheral surface of the cylindrical body. Thereby, the oil separation means can easily form a rotational flow of the refrigerant along the inner peripheral surface of the cylindrical hollow body portion. Therefore, since the lubricating oil centrifuged from the refrigerant can be efficiently attached to the inner peripheral surface, the separation efficiency of the refrigerant and the lubricating oil can be improved.

  In the invention according to claim 7, the oil outlet is provided at the bottom of the hollow body.

  Thus, the oil separator can return the lubricating oil separated from the refrigerant into the housing by dropping due to gravity.

  In the inventions according to claims 8 to 9, it is preferable that the oil outlet portion opens toward the side of the hollow body portion. Thereby, there is no possibility that the refrigerant discharged from the compression mechanism part directly flows into the oil outlet part of the hollow body part. Specifically, the invention according to claim 8 is characterized in that the oil outlet portion communicates the inner bottom portion of the hollow body portion of the oil outlet portion with the side surface of the hollow body portion. Further, the invention according to claim 9 is characterized in that the oil outlet portion is provided on a side wall of the hollow body portion.

  In the invention according to claim 10, the compression mechanism portion is formed with an intermediate pressure region that is an intermediate pressure between the discharge pressure and the suction pressure, and the oil outlet portion is connected to the intermediate pressure region. And

  As a result, the oil separating means can guide the lubricating oil separated from the refrigerant to an intermediate pressure region, which is a lower pressure than the internal pressure of the housing from which the refrigerant is discharged, using the differential pressure.

  In the invention according to claim 11, the compression mechanism section includes a fixed scroll member and a movable scroll member that form an operation space for sucking and compressing the refrigerant therein, and the intermediate pressure region is movable with the fixed scroll member. It is a back pressure region that acts on the movable scroll member so that the scroll member forms a mesh.

  This facilitates the supply of lubricating oil to the member that rotationally drives the movable scroll member with the lubricating oil separated from the refrigerant in order to reduce the oil rate. Therefore, the oil rate in the refrigerant circulation system can be further reduced, and the amount of oil required for the compression mechanism in the compressor can be secured.

The invention described in claim 12 is characterized in that the refrigerant used in the compressor according to any one of claims 1 to 11 is carbon dioxide (CO ₂ ).

  Hereinafter, embodiments in which the compressor of the present invention is applied to a high-pressure shell type hermetic compressor will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a compressor according to the present embodiment. FIG. 2 is a cross-sectional view of the oil separator in FIG. 1 as viewed from the II direction. FIG. 3 is a cross-sectional view of the bottom of the oil separator in FIG. 1 as viewed from the III direction. 2 and 3, the arrows in the drawings schematically show the flow of the refrigerant, and the direction of the arrow shows the flow of the refrigerant.

  As shown in FIG. 1, a compressor 100 includes a compression mechanism unit 130 that sucks and compresses a refrigerant, an electric motor unit (hereinafter referred to as a motor unit) 120 that rotationally drives the compression mechanism unit 130, a compression mechanism unit 130, and a motor unit. And a housing 110 as a sealed container for accommodating 120.

The refrigerant compressed by the compressor 100 may be any of refrigerant gas (gas) such as Freon, carbon dioxide (CO ₂ ), and liquid. The refrigerant described in the following embodiment is carbon dioxide (CO ₂ ).

  The housing 110 is a pressure vessel that can withstand a high pressure caused by the refrigerant gas discharged from the compression mechanism unit 130. Specifically, the housing 110 includes, for example, an upper housing 111, a cylindrical cylindrical housing 112, and a lower housing 113, and a sealed container that accommodates the compression mechanism unit 130 and the motor unit 120 by welding them together. Is forming. The compression mechanism portion 130 is fixed in the middle housing 112 on one end side in the axial direction of the housing 110 (upper side in FIG. 1), and the motor portion 120 is on the other end side in the axial direction of the housing 110 (lower side in FIG. 1). The cylindrical housing 112 is fixed.

  Here, the sealed container (housing) 110 corresponds to the housing described in the claims.

  The motor unit 120 includes a rotor unit 121 and a stator unit 122. The rotor part 121 is a rotor that rotates in the stator part 122. The rotor part 8 includes a plurality of permanent magnets and a drive shaft 131 that is rotatably supported via a bearing (not shown). It is configured to include. The bearings are mounted on a middle housing 115 fixed to the cylindrical housing 112 by shrink fitting or the like, and a bearing frame 116 fixed to the cylindrical housing 112 by welding or the like.

  The stator part 122 is composed of a stator core (hereinafter referred to as a stator main body) formed of a magnetic member and a coil 123 wound around the stator main body.

  The compression mechanism unit 130 includes a fixed scroll member 136, a movable scroll member 135, and a working space (hereinafter referred to as a working chamber) in which refrigerant is sucked and compressed by forming a mesh between the fixed scroll member 136 and the movable scroll member 135. 142. Specifically, between the fixed scroll member 136 and the middle housing 115, spiral teeth (hereinafter referred to as a fixed scroll) 136s formed on the fixed scroll member 136 and spiral teeth that mesh with the fixed scroll. A movable scroll member 135 having a portion (hereinafter referred to as orbiting scroll) 135s is disposed. The orbiting scroll 135s revolves with respect to the fixed scroll 136s, thereby expanding and reducing the volume of the working chamber 142 to suck and compress the refrigerant.

  An eccentric portion 131a provided at the distal end portion of the drive shaft 131 is inserted through an unillustrated bearing on the side of the movable scroll member 135 opposite to the fixed scroll member 136. The movable scroll member 135 revolves with respect to the fixed scroll member 136 as the drive shaft 131 is driven to rotate by a rotation prevention mechanism (not shown).

  A suction chamber 141 is formed on the outer peripheral side between the scroll members 135 and 136, and a compression chamber 142 is formed on the center side. The compressed refrigerant is discharged into the discharge chamber 114 through a discharge port 136 a formed in the fixed scroll member 136. The discharge chamber 114 is partitioned into an upper housing 111 and a cylindrical housing 112 on the side of the fixed scroll member 136 opposite to the fixed scroll 136s. The discharge chamber 114 communicates with a motor chamber 124 in which the motor unit 120 is accommodated by a passage (not shown). As a result, the discharge chamber 114 and the motor chamber 124 are discharged refrigerant gas blown air compressed by the compression mechanism unit 130.

  The motor chamber 124 is defined by a middle housing 115 and a bearing frame 116 in the cylindrical housing 112. An oil storage chamber 117 defined by the lower housing 113 is formed on the side of the bearing frame 116 opposite to the motor chamber 124, and an oil reservoir for storing lubricating oil is formed in the oil storage chamber 117. The lubricating oil accumulated in the oil storage chamber 117 passes through an oil passage 132 provided in the drive shaft 131 and is sucked up to each bearing of the drive shaft 131 and the compression mechanism portion 130.

  In the above structure, for example, a communication hole (not shown) is provided in the bearing frame 116 so that the discharged refrigerant gas envelope acts on the lubricating oil accumulated in the oil storage chamber 117.

  Further, a back pressure chamber 143 for applying a back pressure to the movable scroll member 135 is formed between the movable scroll member 135 and the middle housing 115 so that the fixed scroll 136s and the orbiting scroll 135s are engaged with each other. The back pressure chamber 143 corresponds to an intermediate pressure region that is an intermediate pressure between the discharge pressure and the suction pressure.

  An external pipe (hereinafter referred to as a discharge pipe) 111 a that allows the high-pressure refrigerant in the discharge chamber 114 to flow out is provided in the upper housing 111. In addition, a suction pipe 112 a through which an external low-pressure refrigerant flows into the suction chamber 141 is provided in the cylindrical housing 112. The refrigerant introduced into the suction pipe 112a is sucked into the working chamber 142 when the working chamber 142 opens toward the suction chamber 141 on the outer periphery of each scroll 135s, 136s of the compression mechanism section 130. Then, while the orbiting scroll 135s revolves, the working chamber 142 shrinks while moving in the radial direction toward the center, whereby the refrigerant is compressed to a high pressure. In the working chamber 142 that has moved to the center, the refrigerant that has reached the discharge pressure is discharged to the discharge chamber 114 via the discharge port 136a.

  Here, the discharge pipe 111 corresponds to the discharge pipe described in the claims, and the opening ao of the opening a of the discharge pipe 111 corresponds to the inlet of the discharge pipe.

  The high-pressure refrigerant compressed by the compression mechanism unit 130 is once discharged into the discharge chamber 114 through the discharge port 136a, and then from the discharge pipe 111a that opens into the discharge chamber 114 via the discharge chamber 114 or the motor chamber 124. It is supplied to the outside (for example, a condenser (not shown) of the refrigerant circulation system). Note that the opening 111ao on the discharge chamber 114 side of the discharge pipe 111a is provided in the sealed container 110 and corresponds to a terminal portion of the discharge path that discharges outside the sealed container 110 of the compressor 100.

  In the present embodiment, an oil separator 150 as oil separating means for separating the lubricating oil contained in the refrigerant is provided between the motor unit 120 and the discharge pipe 111a, particularly in the opening 111ao of the discharge pipe 111a. Yes. The oil separator 150 is a centrifugal type that at least centrifuges the lubricating oil contained in the refrigerant on the discharge chamber 114 side, and forms a separation chamber 152 as shown in FIGS. 1, 2, and 3. A hollow body portion 151, a refrigerant inlet portion 153 into which a fluid mixed with refrigerant and lubricating oil can flow, and an oil outlet portion 154 from which at least a liquid such as lubricating oil can be discharged.

  The hollow body 151 is disposed so as to partition the opening 111ao of the discharge pipe 111a and the inside of the discharge chamber 114. The discharge pipe 111 a is disposed in the hollow body portion 151 so as to be inserted into the separation chamber 152, and constitutes a part of the oil separator 150.

  As shown in FIGS. 1 and 2, the refrigerant inlet portion 153 is provided on the upper side of the hollow body portion 151 so that the refrigerant flows into the separation chamber 152 toward the radially outer side of the discharge pipe 111a. Has been placed. Thereby, the refrigerant flowing in through the discharge pipe 111 a forms a rotational flow between the outer periphery of the discharge pipe 111 a and the inner periphery 151 a of the hollow body portion 151.

  Moreover, in this embodiment, the hollow body part 151 is formed in the cylindrical shape, The cylindrical inner peripheral surface is formed in the inner periphery 151a. It is preferable that the axis | shaft of the refrigerant | coolant inlet part 153 is arrange | positioned so that the internal peripheral surface (tangential direction of an internal peripheral surface) of the cylindrical hollow body part 151 may be followed. Thereby, a rotational flow can be easily given to the refrigerant flowing into the separation chamber 152 of the hollow body portion 151 through the refrigerant inlet portion 153.

  Moreover, in this embodiment, the oil outlet part 154 is arrange | positioned in the position of the vertically downward side rather than the refrigerant | coolant inlet part 153, as shown in FIG. 1 and FIG. Furthermore, the oil outlet portion 154 is arranged at the bottom portion of the hollow body portion 151 and in the radial direction. Thereby, the lubricating oil separated from the refrigerant in the separation chamber 152 can be returned to the discharge chamber 114 through the oil outlet portion 154 by dripping due to centrifugal force and gravity. Therefore, the lubricating oil separated from the refrigerant by the oil separator 150 is recirculated into the sealed container 110, and the refrigerant whose oil rate is reduced by the oil separation by the oil separator 150 is supplied to the outside from the discharge pipe 111a. it can.

  Specifically, as shown in FIG. 3, the oil outlet portion 154 disposed at the bottom of the hollow body portion 151 is disposed in parallel along the bottom surface on the inner circumference 151a side in the radial direction, and the discharge pipe 111a. Two are provided on the inner circumference 151a on both sides of the side. In addition, the number of the oil outlet parts 154 provided in the hollow body part 151 is not limited to two (see FIG. 3), and may be one or a plurality such as three.

  With the above-described configuration, the oil outlet portion 154 is not arranged in parallel to the discharge port 136a, so that the refrigerant discharged from the discharge port 136a is prevented from flowing into the oil outlet portion 154.

  In the present embodiment described above, the oil separator 150 that separates the lubricating oil contained in the refrigerant in the sealed container 110 is provided between the motor unit 120 and the discharge pipe 111a. As a result, even if the high-pressure refrigerant discharged from the compression mechanism unit 130 into the sealed container 110 is swung up by the rotation of the motor unit 120, the oil separator 150 removes the lubricating oil contained in the refrigerant. Since the refrigerant separated from the refrigerant and passed through the oil separator 150 can be guided to the opening (inlet) 111ao of the discharge pipe 111a, oil can be sufficiently prevented from flowing out of the sealed container 110. Therefore, in the refrigerant circulation system including the compressor 100, the oil rate discharged from the compressor 100 can be further reduced.

  Further, in the present embodiment described above, the oil separator 150 is of a centrifugal type that at least centrifuges as a method of separating the lubricating oil from the refrigerant. According to this, in addition to the separation due to the density difference between the refrigerant and the lubricating oil in the sealed container 110 and the separation due to the viscosity difference (adhesion difference) between the refrigerant and the lubricating oil, the refrigerant and the lubricating oil are centrifuged. In particular, the lubricating oil contained in the refrigerant can be separated from the refrigerant.

  Further, in the present embodiment described above, the discharge chamber 114 side of the sealed container 110 has the discharge pipe 111a capable of circulating the refrigerant into and out of the sealed container 110. The discharge pipe 111a is provided with the oil separator 150. Part of. Thereby, the oil separator 150 can be easily accommodated with a relatively inexpensive structure.

  Further, in the present embodiment described above, the oil separator 150 is provided in the hollow body 151 and the hollow body 151 that partitions the opening 111ao inside the sealed container 110 of the discharge pipe 111a and the inside of the sealed container 110. A refrigerant inlet portion 153 that forms a rotational flow between the inner periphery 151a and the outer periphery of the discharge pipe 111a, and an oil outlet portion 154 that is provided in the hollow body portion 151a and disposed vertically downward from the refrigerant inlet portion 153. It has.

  Accordingly, the oil separator partitions the opening 111ao of the discharge pipe 111a at the end of the discharge path in the sealed container 110 and the inside of the sealed container 110, and forms a rotational flow of the refrigerant around the outer periphery of the discharge pipe 111a. be able to. Therefore, the lubricating oil in the refrigerant can be centrifuged by the rotational flow of the refrigerant, and the separated lubricating oil can be recovered from the oil outlet 154.

  Further, in the present embodiment described above, the hollow body portion 151 is formed in a cylindrical body that surrounds the discharge pipe 111a inside, and the refrigerant inlet portion 153 is parallel to the tangential direction of the cylindrical inner peripheral surface 151a. It is preferable to arrange | position. Thereby, the oil separator 150 can easily form a rotational flow of the refrigerant along the inner peripheral surface 151 a of the cylindrical hollow body portion 151. Accordingly, since the lubricating oil centrifuged from the refrigerant is efficiently attached to the inner peripheral surface 151a, the separation efficiency between the refrigerant and the lubricating oil can be improved.

  Moreover, in this embodiment demonstrated above, the oil outlet part 154 is provided in the bottom part of the hollow body part 151, and radial direction. Thereby, the oil separator 150 can recirculate the lubricating oil separated from the refrigerant into the sealed container 110 by the dripping due to centrifugal force and gravity.

  In the above-described embodiment, the separation chamber 152 and the discharge chamber 114 of the oil separator 150 are configured such that fluid (refrigerant, lubricating oil, etc.) can flow only through the refrigerant inlet 153 and the oil outlet 154. Therefore, the separation chamber 152 may be slightly reduced with respect to the discharge chamber 114 due to pressure loss at the refrigerant inlet portion 153 and the oil outlet portion 154. On the other hand, since the rotational flow (centrifugal force) acts on the refrigerant flow by the arrangement of at least the refrigerant inlet portion 153, the reverse flow of the separated lubricating oil is prevented.

  Moreover, in this embodiment demonstrated above, the oil exit part 154 is provided in the bottom part of the hollow body part 151, and is opening toward the side. Thereby, there is no possibility that the refrigerant discharged from the compression mechanism part 130 flows directly into the oil outlet part 154 of the hollow body part 150.

(Second Embodiment)
Hereinafter, other embodiments to which the present invention is applied will be described. In the following embodiments, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated.

  In 2nd Embodiment, as shown in FIG. 4, the oil exit part 254 is arrange | positioned so that the internal peripheral surface 151a of the hollow body part 151 may be followed. FIG. 4 is a cross-sectional view showing the bottom of the oil separator according to this embodiment.

  The oil separator 250 has a hollow body portion 151, a refrigerant inlet portion 153, and an oil outlet portion 254, and the oil outlet portion 254 is arranged in parallel to the tangential direction of the inner peripheral surface 151a. Yes.

  Accordingly, the opening of the oil outlet portion 254 is opened in parallel to the tangential direction of the inner peripheral surface 151a, so that the fluid such as the separated lubricating oil easily flows out of the oil separator 250.

(Third embodiment)
In the third embodiment, as shown in FIG. 5, the opening 354 a on the separation chamber 152 side of the oil outlet 254 is opened on the bottom surface of the bottom of the hollow body 151. FIG. 5 is a cross-sectional view showing a part of the oil separator according to this embodiment.

  The oil separator 350 has a hollow body portion 151, a refrigerant inlet portion 153, and an oil outlet portion 354, and the oil outlet portion 354 has an opening 354a on the side of the separation chamber 152 opened on the bottom surface. At the same time, an opening 354 b on the discharge chamber 114 side is parallel to the bottom surface and opened on the side surface of the hollow body 151. Thereby, the lubricating oil collected at the bottom of the separation chamber 152 can be easily collected into the sealed container 110.

(Fourth embodiment)
In the fourth embodiment, as shown in FIG. 6, the oil outlet portion 254 is connected to a portion lower in pressure than the discharge pressure in the sealed container 110. FIG. 6 is a cross-sectional view showing the compressor according to the present embodiment. FIG. 7 is a cross-sectional view of the bottom of the oil separator in FIG. 6 as viewed from the VII direction. FIG. 8 is a cross-sectional view of the bottom of the oil separator in FIG. 6 as viewed from the VIII direction.

  As shown in FIG. 6, the oil separator 450 includes a recovery pipe 455 having a hollow body part 151, a refrigerant inlet part 153, an oil outlet part 154, and an oil recovery path 456 connected to the oil outlet part 154. Yes. 6 and 8, the recovery pipe 455 is connected to a recovery hole 437 formed in the fixed scroll member 136 so that the oil outlet 154 and the back pressure chamber 443 communicate with each other.

  The recovery hole 437 has a throttle portion 437a that adjusts the flow rate of the separated lubricating oil. The throttle portion 437a may be formed using a capillary tube formed by piping or the like.

  In the present embodiment described above, the oil outlet portion 154 of the oil separator 450 is connected to the back pressure chamber 443 corresponding to an intermediate pressure region that is an intermediate pressure between the discharge pressure and the suction pressure. Thereby, the oil separator 450 can guide the lubricating oil separated from the refrigerant to the intermediate pressure region, which is a lower pressure portion than the internal pressure of the sealed container 110 from which the refrigerant is discharged, using the differential pressure.

  In particular, in this embodiment, the intermediate pressure region for recovering the lubricating oil separated from the refrigerant is the back pressure chamber 443 of the compression mechanism unit 130. Therefore, the lubricating oil is supplied to the member that rotationally drives the movable scroll member 135. In order to reduce the oil rate, it becomes easy with the lubricating oil separated from the refrigerant. Therefore, the oil rate in the refrigerant circulation system can be further reduced, and the amount of oil required for the compression mechanism 130 in the compressor 100 can be secured.

(Fifth embodiment)
In the first embodiment, the compression mechanism unit 130 includes a spiral fixed scroll 136a and a turning scroll 135a, and the fixed scroll 136a and the turning scroll 135a form an engagement, so that suction and compression are performed in the internal working chamber 142. The scroll type compressor structure is explained.

  On the other hand, in the fifth embodiment, as shown in FIG. 9, the compression mechanism 530 has a rotary compressor structure having a rotor 534 and a vane (not shown) in a cylinder 533. . FIG. 9 is a cross-sectional view illustrating the compressor according to the present embodiment.

  The compressor 500 includes a compression mechanism unit 530, a motor unit 120, and an oil separator 150.

  The compression mechanism portion 530 is housed in the cylinder 533 and the cylinder 533, and has a known rotary structure including a rotor 534, an eccentric portion (hereinafter referred to as a crank pin) 531a of the drive shaft 531 and a vane. The cylinder 533 is fixed to the inner wall of the sealed container 510. A cylinder chamber 153 a is formed by the inner wall of the cylinder 533 and the outer periphery of the rotor 534. The cylinder chamber 153a is divided into a suction chamber 153b and a compression chamber 153c by a vane pressed against the rotor 154 by a biasing member such as a vane spring (not shown).

  The rotor 534 revolves by the drive shaft 531 of the upper motor unit 120 to suck and compress the refrigerant. In the present embodiment, the compressor 500 includes two compression mechanism sections 530 (hereinafter referred to as two cylinders). Each compression mechanism section 530 sucks the refrigerant through the suction pipe 512a, and discharges the refrigerant having a discharge pressure in the compression chamber 153c from a discharge port (not shown) to a discharge chamber 514 that also serves as a motor chamber. In the compression mechanism 530, the lubricating oil stored in the storage chamber 517 is supplied to the sliding portions of the rotor 534, the cylinder 533, and the vane through the oil flow path 532.

  Even if it is such a structure, the effect similar to 1st Embodiment can be acquired.

(Other embodiments)
As mentioned above, although one Embodiment of this invention was described, this invention is limited to this embodiment and is not interpreted and can be applied to various embodiment in the range which does not deviate from the summary.

  (1) For example, in this embodiment described above, in the oil separators 150, 250, 350, and 450, the hollow body portion 151 has a cylindrical shape. The shape of the hollow body portion 151 is not limited to this, and may be a polygonal shape such as a triangle or a square, or a spherical shape.

  (2) In the present embodiment described above, the discharge pipe 111 a is provided in the upper housing 111 in the sealed container 110. The attachment site of the discharge pipe 111a in the sealed container 110 is not limited to this and may be attached to the cylindrical housing 112. Therefore, in the sealed container 110, for example, the centrifuge may be arranged in an oblique state.

  (3) In the present embodiment described above, in the compressors 100, 200, 300, 400, and 500, the compression mechanism units 130 and 530 and the motor unit 120 are arranged in the vertical direction (top and bottom direction) in the drawing. The structure is explained. Not only this but the structure in which the compression mechanism parts 130 and 530 and the motor part 120 are located in the left-right direction (horizontal direction) in a figure may be sufficient.

  (4) In the fourth embodiment, the oil outlet 154 of the sealed container 110 is connected to the back pressure chamber 443 corresponding to the intermediate pressure region via the oil recovery path 456. Not limited to this, the oil outlet 154 and the suction chamber 141 may be configured to be connected by an oil recovery path, and the lubricating oil separated from the refrigerant is guided to a lower pressure portion than the discharge pressure. Any may be used.

  (5) In the present embodiment described above, the centrifugal oil separator 150 is employed as the oil separating means, but the present invention is not limited to this, and the oil separating means is disposed around the discharge pipe. The structure which arrange | positions a collision wall and isolate | separates lubricating oil by this collision wall may be sufficient.

  (6) In the present embodiment described above, an example of a hermetic compressor in which the compression mechanism unit 130 and the electric machine unit 120 are housed in the housing has been described. However, the present invention is not limited to this example. A so-called open type compressor may be used in which the drive shaft is disposed outside the housing and is driven by a pulley or the like.

It is sectional drawing which shows the compressor by the 1st Embodiment of this invention. It is sectional drawing which looked at the oil separator in FIG. 1 from the II direction. It is sectional drawing which looked at the bottom part of the oil separator in FIG. 1 from the III direction. It is sectional drawing which shows the bottom part of the oil separator concerning 2nd Embodiment. It is sectional drawing which shows a part of oil separator concerning 3rd Embodiment. It is sectional drawing which shows the compressor by 4th Embodiment. It is sectional drawing which looked at the bottom part of the oil separator in FIG. 6 from the VII direction. It is sectional drawing which looked at the bottom part of the oil separator in FIG. 6 from the VIII direction. It is sectional drawing which shows the compressor by 5th Embodiment.

Explanation of symbols

100 compressor (sealed compressor)
110 Housing (closed container)
111 Upper housing 111a Discharge pipe (discharge pipe, external pipe)
111ao opening (entrance)
112 cylindrical housing 112a suction pipe 114 discharge chamber 115 middle housing 117 oil storage chamber 120 motor part (motor part)
DESCRIPTION OF SYMBOLS 130 Compression mechanism part 131 Drive shaft 131a Eccentric part 132 Oil flow path 135 Movable scroll member 135s Orbiting scroll 136 Fixed scroll member 136a Discharge port 136s Fixed scroll 141 Suction chamber 142 Working chamber 143 Back pressure chamber 150 Oil separator 151 Hollow body part 151 Inner circumference 152 Separation chamber 153 Refrigerant inlet 154 Oil outlet

Claims (12)

A housing;
An electric motor unit housed in the housing;
A compression mechanism that is driven by the electric motor unit to compress the refrigerant, and discharges the compressed refrigerant into the housing;
In the compressor comprising a discharge pipe for guiding the refrigerant discharged in the housing to the outside of the housing,
Comprising oil separating means for separating lubricating oil contained in the refrigerant discharged into the housing;
The compressor, wherein the refrigerant that has passed through the oil separation means is guided to an inlet of the discharge pipe. A compression mechanism that compresses the refrigerant; an electric motor that drives the compression mechanism; and a housing that houses the compression mechanism and the electric motor.
In the compressor that discharges the refrigerant compressed by the compression mechanism portion into the housing, and then discharges the refrigerant outside the housing through a discharge pipe provided in a portion where the electric motor portion is disposed in the housing.
The compressor characterized in that an oil separating means for separating the lubricating oil contained in the refrigerant in the housing is provided at the inlet of the discharge pipe.   The compressor according to claim 1 or 2, wherein the oil separation means is a centrifugal oil separator. The discharge pipe is attached to the housing, and includes an external pipe that enables refrigerant flow inside and outside the housing,
The compressor according to any one of claims 1 to 3, wherein a pipe portion inside the housing of the external pipe constitutes a part of the oil separation means. The oil separating means includes
A hollow body portion defining an inlet inside the housing of the discharge pipe and the inside of the housing;
A refrigerant inlet that is provided in the hollow body and forms a rotational flow between the inner periphery of the hollow body and the outer periphery of the discharge pipe;
An oil outlet provided in the hollow body portion and disposed vertically downward from the refrigerant inlet;
The compressor according to claim 4, further comprising: The hollow body portion is formed in a cylindrical body surrounding the discharge pipe inside,
The compressor according to claim 5, wherein the refrigerant inlet portion is disposed in parallel to a tangential direction of an inner peripheral surface of the cylindrical body.   The compressor according to claim 5 or 6, wherein the oil outlet portion is provided at a bottom portion of the hollow body portion.   The compressor according to claim 7, wherein the oil outlet portion communicates an inner bottom portion of the hollow body portion of the oil outlet portion with a side surface of the hollow body portion.   The compressor according to any one of claims 5 to 7, wherein the oil outlet portion is provided on a side wall of the hollow body portion. The compression mechanism portion is formed with an intermediate pressure region that is an intermediate pressure between the discharge pressure and the suction pressure,
The compressor according to any one of claims 4 to 9, wherein the oil outlet portion is connected to the intermediate pressure region. The compression mechanism unit includes a fixed scroll member and a movable scroll member that form a working space for sucking and compressing refrigerant therein,
The compressor according to claim 10, wherein the intermediate pressure region is a back pressure region that acts on the movable scroll member so that the fixed scroll member and the movable scroll member are engaged with each other. Compressor, wherein the refrigerant used in the compressor according to any one of claims 1 to 11 is carbon dioxide (CO _2).

Images