JP2020060122A - Scroll-type compressor - Google Patents

Abstract

To provide a scroll-type compressor suitable to be used for oil free or semi-oil free air cooling cycle and refrigerating cycle.SOLUTION: In a scroll-type compressor constituted of first and second drive scroll members 8 and 9 and a driven scroll member 11, a discharge hole 6a communicated with a delivery port 4a is formed in a first rotation shaft 6 provided in the first drive scroll member 8 for rotatably holding the drive scroll member 8, a check valve 17 is provided on the side of the first drive scroll member 8 of the discharge hole 6a, and a check valve hole 8d for opening and closing the check valve 17 communicates with the delivery port 4a, and is concentric with the rotation center line of the first rotation shaft 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a scroll compressor that includes a drive scroll member and a driven scroll member that rotates with the rotation of the drive scroll, and that sucks and compresses an oil-free or semi-oil-free refrigerant.

  Patent Document 1 (Japanese Patent Laid-Open No. 11-82333) includes a casing, a side cover, a drive scroll and a driven scroll, and the driven scroll rotates about a drive shaft center and the driven scroll is eccentric to the drive shaft center. A wrap portion that rotates around an axis and both of the scrolls rotate synchronously, and that is provided axially on each end plate of both the driving and driven scrolls and that functions as a compression chamber that compresses fluid from the outer circumference toward the center. The two scroll teeth forming the above are engaged and configured with a certain angle difference, and the scroll center of the drive scroll and the follower scroll is a space without engaging the scroll tooth wrap portion, and one scroll is configured. A cylindrical barrier is provided in the space, an outer region of the cylindrical portion of the cylindrical barrier is used as a final compression chamber, and a discharge hole is provided in a scroll end plate located in the final compression chamber. With keeping the engagement of the wrap portion in the configuration to the final compression chamber, the drive scroll and the driven scroll is disclosed a scroll fluid machine according to claim configured to rotate synchronously by a single driving source. As described above, in Patent Document 1, a cylindrical shielding wall is provided in the central space, the outer region of the cylindrical shielding wall is used as a final compression chamber, and after sealing, the inside of the cylindrical shielding wall is ventilated with the atmosphere. Therefore, the inside temperature can be set to a low temperature.

  In Patent Document 2 (Japanese Patent Laid-Open No. 11-210658), a rotating shaft that transmits a drive scroll is held by a bearing to a compression action portion (orbiting scroll) that compresses a fluid, and the fluid taken in from the suction port is compressed and discharged. Disclosed is an oil-free fluid machine that discharges from an outlet, in which at least one of the bearings arranged in the fluid machine is formed of a solid lubrication bearing.

  Patent Document 3 (Japanese Patent Laid-Open No. 2002-364559) discloses a drive scroll and a driven scroll that are arranged so as to face each other so that their centers of rotation are different from each other, and a crank that connects the outer peripheral portions of these drive scroll and driven scroll. A pin and a rolling bearing that rotatably supports both ends of the crank pin on the drive scroll and the driven scroll are provided, and the drive scroll and the driven scroll form a compression chamber by meshing respective spiral wraps with each other. A synchronous rotary scroll fluid machine that compresses fluid by reducing the internal volume of the compression chamber by synchronously rotating a scroll and a driven scroll via the crank pin, wherein the rolling bearing has a resin solid lubricant Disclosed is a synchronous rotating scroll fluid machine that is filled with an agent.

JP, 11-82333, A JP-A-11-210658 JP 2002-364559 A

  For example, a refrigerant used in a cooling cycle such as an air conditioner and a refrigeration cycle such as a refrigerator is inevitably changed to an alternative CFC due to a problem of ozone layer depletion due to CFC. However, this CFC alternative is incompatible with conventional mineral oil-based lubricating oils, and thus new lubrication methods are required for compressors used in oil-free or semi-oil-free cooling and refrigeration equipment, for example. .

  Therefore, the present invention provides a scroll compressor suitable for use in an oil-free or semi-oil-free cooling cycle and a refrigeration cycle.

  A scroll compressor according to the present invention includes a housing, a pair of drive scroll members rotatably held in the housing, and a pair of drive scroll members that are sandwiched by the pair of drive scroll members. A driven scroll member that makes an orbiting motion relative to the drive scroll member, a driven scroll receiver for rotatably holding the driven scroll member with respect to the housing, the drive scroll member side, and the driven scroll member. And a rotation prevention mechanism including a rotation prevention ring that is provided on the driven scroll member side and that is provided on the driven scroll member side and that rotates along the inner surface of the rotation prevention ring. However, a compression chamber is defined by the driving scroll member and the driven scroll member, and the compression chamber is driven by the driven scroll member. And a discharge port formed in one central portion of the drive scroll member at the same time as communicating with a suction port formed in an outer peripheral portion of the drive scroll member, and the volume of the compression chamber is changed as the drive scroll member rotates. A scroll type compressor, which is reduced from the suction port toward the discharge port, compresses the fluid sucked from the suction port and discharges the fluid from the discharge port, is provided on one of the drive scroll members, A discharge hole communicating with the discharge port is formed on a rotating shaft that rotatably holds the drive scroll member, and a check valve is provided on the drive scroll member side of the discharge hole. The check valve hole that opens and closes the valve communicates with the discharge port and is concentric with the rotation center line of the rotation shaft.

  As described above, according to the above-described invention, the centrifugal force due to the rotation of the drive scroll member does not act on the check valve, so that the life of the check valve can be extended.

  Further, it is preferable that a suction port is formed in the housing at a position facing the suction port, and a urethane grease reservoir is formed at a peripheral edge of the regulation pin.

  In the case of a scroll compressor for an oil-free refrigerator, since the refrigerant does not contain oil, the urethane grease can be exuded by the centrifugal force applied to the regulation pin by providing a urethane grease reservoir. With this refrigerant, it is possible to maintain good lubrication of the rotation prevention mechanism. Further, in order to rotatably support each of the rotary shaft and the driven scroll receiver in the housing, it is desirable to provide a ceramic bearing having grease for a refrigerant resistant bearing. As a result, even in the case of an oil-free refrigerant, the bearing is reliably lubricated, so that the rotating shaft can be held smoothly.

  Further, the housing is provided with suction ports at two positions facing the driven scroll receiver, and the oil dissolved in the refrigerant sucked from the suction port is made to collide with the end portion of the driven scroll receiver to cause oil. It is desirable to separate

  In the present invention, in the case of the scroll compressor for the semi-oil-free refrigerator, the oil can be separated by colliding the semi-oil-free refrigerant sucked from the suction port with the end of the driven scroll receiver. The oil can lubricate the bearings and the like. Further, the oil is scattered by the centrifugal force and is not sucked into the compression space, so that the discharged refrigerant does not contain oil.

  Furthermore, it is desirable that the rotation prevention ring be formed of an oil-containing sintered metal. As a result, the regulation pin of the rotation preventing mechanism can be swung smoothly along the inner peripheral surface of the rotation preventing ring, so that the driven scroll member is prevented from rotating with respect to the drive scroll member and is smoothly swung. Is something that can be done.

  Further, it is preferable that a cylindrical heat insulating material is press-fitted into the inner peripheral surface of the discharge port formed on the rotating shaft to hold one end of a spring that presses the check valve. As a result, it is possible to prevent the compression heat from escaping and prevent the heat transfer to the bearing, so that the durability of the bearing can be improved.

  Further, on the back surface of the drive scroll member, there is provided a flange portion that expands in the radial direction from the base portion of the rotary shaft, and this flange portion is preferably formed of a material having low thermal conductivity, particularly stainless steel. As a result, it is possible to prevent the compression heat of the refrigerant compressed thereby from being released from the rotating drive scroll member.

  The scroll compressor having the above structure can smoothly lubricate each part such as the bearing, and can reliably prevent heat transfer of the compression heat of the compressed refrigerant, so that smooth driving and durability and It is possible to improve the performance.

1 is a cross-sectional view of a scroll compressor for an oil-free refrigerator according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a scroll compressor for a semi-oil-free refrigerator according to a second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  The scroll compressor 1 according to the first embodiment of the present invention includes a cylindrical housing body 2a and first and second lid-shaped housings 2b and 2c that close the housing body 2a at both ends. It comprises a configured housing 2. Thereby, the housing 2 defines the working space 3 therein. A cap portion 4 having a discharge port 4a for a fluid such as a refrigerant is fixed to the first lid-shaped housing 2b. The cap portion 4 has a first rotating shaft 6 and a first rotating shaft 6 described below. A face seal portion 16 that rotatably holds the end portion of the heat insulating member 18 disposed inside the rotating shaft 6 is provided to prevent leakage of high-pressure refrigerant. Further, a shaft seal holding plate portion 5 for fixing a shaft seal 5a for axially sealing the periphery of the second rotary shaft 10 with an oil seal is fixed to the second lid-shaped housing 2c.

  The first rotary shaft 6 having a discharge hole 6a communicating with the discharge port 4a formed in the cap portion 4 is rotatably held by the first lid-shaped housing 2b via a bearing 7a. It Further, a flange portion 6b that expands in the radial direction is formed at the base end portion of the first rotary shaft 6, and the first drive scroll member 8 is fixed to this flange portion 6b.

  The second drive scroll member 9 that is fixed to the first drive scroll member 8 so as to face the first drive scroll member 8 is connected to an external power, and a second rotary shaft 10 that rotates by the external power. It is fixed to the flange portion 10a that expands in the radial direction at the base end portion, and is rotatably supported by the second lid-shaped housing 2c via a bearing 7b. The first and second rotary shafts 6 and 10, and particularly the flange portions 6b and 10a thereof, are formed of a heat insulating material such as stainless steel, and thus have a structure that does not release the compression heat. There is.

  Further, the first and second drive scroll members 8 and 9 rotatably sandwich the driven scroll member 11, and the first and second end plates 8b and 8b of the first and second drive scroll members 8 and 9, 9b includes first and second drive scroll wraps 8a and 9a extending in the axial direction and first and second driven scroll wraps extending from the end plate 11c of the driven scroll member 11 in both the axial directions. 11a and 11b define compression spaces 12a and 12b on both sides of the end plate 11c of the driven scroll member 11. Further, the outermost peripheral ends of the compression spaces 12a and 12b open into the working space 3, and the working space 3 is provided with a predetermined outer peripheral portion of the end plate 11c of the driven scroll member 11 of the housing body 2a. It communicates with the suction port 15 formed at the location.

  Further, the driven scroll member 11 is supported at its outer peripheral side in both axial directions by the first and second driven scroll receivers 13a and 13b, and the first and second driven scroll receivers 13a and 13b are respectively bearings 7c and It is rotatably held by the first and second lid-shaped housings 2b and 2c via 7d. The bearings 7a, 7b, 7c, 7d are ceramic bearings containing grease for a refrigerant resistant bearing.

  Further, the driven scroll member 11 rotates between the first and second driven scroll receivers 13a and 13b and the flange portions 6b and 10a fixed to the first and second drive scroll members 8 and 9, respectively. A prevention mechanism 14 is provided. The rotation preventing mechanism 14 is fitted into the restriction pin 14a fixed to the collar portions 6b and 10a and the first and second driven scroll receivers 13a and 13b, and the restriction pin 14a extends along the inner peripheral surface. It is composed of three or more places by the rotating anti-rotation ring 14b.

  Further, the compression spaces 12a and 12b are connected to the center side by a through hole 11d formed in the center of the driven scroll member 11, and a discharge port 8c formed in the center of the first drive scroll member 8 is formed. It The discharge port 8c communicates with a discharge hole 6a formed in the first rotating shaft 6 through a check valve hole 8d formed concentric with the rotation center line of the first rotating shaft 6. The check valve hole 8d is opened and closed by the check valve 17 including the spring 17a and the valve body 17b. The end of the spring 17a is held by a heat insulating member 18 made of a cylindrical heat insulating material (ceramics) press-fitted into the discharge hole 6a, and the end of the heat insulating member 18 is held by the face seal portion 16. It is rotatably held. As a result, it is possible to prevent the heat of compression from moving to the bearings, so that the durability can be improved.

  Further, in the first embodiment, the urethane grease reservoir 14c is formed inside the regulation pin 14a, and the urethane grease is exuded by the centrifugal force generated by the turning of the regulation pin 14a. Further, since the rotation prevention ring 14b is made of an oil-containing sintered metal, the regulation pin 14a can smoothly rotate along the inner peripheral surface of the rotation prevention ring 14b. As a result, the driven scroll member 11 also rotates with the rotation of the first and second drive scroll members 8 and 9, but the driven scroll member 11 is prevented from rotating by the rotation preventing mechanism 14, so that the driven scroll member 11 is prevented from rotating. Since the member 11 orbits relative to the first and second drive scroll members 8 and 9, the compression spaces 12a and 12b decrease in volume from the outer peripheral portion toward the center, so that the suction port 15 The refrigerant sucked from the compressor can be compressed and discharged from the discharge port 4a.

  As described above, in the scroll compressor 1 disclosed in the first embodiment, even when the refrigerant sucked from the suction port 15 is oil-free, the rotation preventing mechanism 14 and the bearings 7a, 7b, 7c, 7d. Is sufficiently lubricated and the conduction of compression heat can be prevented, so that smooth driving and improvement of durability can be achieved.

  A scroll type compressor 1A according to a second embodiment of the present invention includes a cylindrical housing body 2a and first and second lid-shaped housings 2b and 2c that close the housing body 2a at both ends. It comprises a configured housing 2. Thereby, the housing 2 defines the working space 3 therein. A cap portion 4 having a discharge port 4a for a fluid such as a refrigerant is fixed to the first lid-shaped housing 2b. The cap portion 4 has a first rotating shaft 6 and a first rotating shaft 6 described below. A face seal portion 16 that rotatably holds the end portion of the heat insulating member 18 disposed inside the rotating shaft 6 is provided to prevent leakage of high-pressure refrigerant. Further, a shaft seal holding plate portion 5 for fixing a shaft seal 5a for axially sealing the periphery of the second rotary shaft 10 with an oil seal is fixed to the second lid-shaped housing 2c.

  The first rotary shaft 6 having a discharge hole 6a communicating with the discharge port 4a formed in the cap portion 4 is rotatably held by the first lid-shaped housing 2b via a bearing 7a. It Further, a flange portion 6b that expands in the radial direction is formed at the base end portion of the first rotary shaft 6, and the first drive scroll member 8 is fixed to this flange portion 6b.

  The second drive scroll member 9 that is fixed to the first drive scroll member 8 so as to face the first drive scroll member 8 is connected to an external power, and a second rotary shaft 10 that rotates by the external power. It is fixed to the flange portion 10a that expands in the radial direction at the base end portion, and is rotatably supported by the second lid-shaped housing 2c via a bearing 7b. The first and second rotary shafts 6 and 10, and particularly the flange portions 6b and 10a thereof, are formed of a heat insulating material such as stainless steel, and thus have a structure that does not release the compression heat. There is.

  Further, the first and second drive scroll members 8 and 9 rotatably sandwich the driven scroll member 11, and the first and second end plates 8b and 8b of the first and second drive scroll members 8 and 9, 9b includes first and second drive scroll wraps 8a and 9a extending in the axial direction and first and second driven scroll wraps extending from the end plate 11c of the driven scroll member 11 in both the axial directions. 11a and 11b define compression spaces 12a and 12b on both sides of the end plate 11c of the driven scroll member 11. Further, the outermost peripheral ends of the compression spaces 12a and 12b open to the working space 3, and the working space 3 faces the housing main body portion 2 where first and second driven scroll receivers 13a and 13b described below face each other. To communicate with the suction ports 15A and 15B formed at predetermined locations.

  Further, the driven scroll member 11 is supported at its outer peripheral side in both axial directions by the first and second driven scroll receivers 13a and 13b, and the first and second driven scroll receivers 13a and 13b are respectively bearings 7c and It is rotatably held by the first and second lid-shaped housings 2b and 2c via 7d. The bearings 7a, 7b, 7c, 7d are ceramic bearings containing grease for a refrigerant resistant bearing.

  Further, the driven scroll member 11 rotates between the first and second driven scroll receivers 13a and 13b and the flange portions 6b and 10a fixed to the first and second drive scroll members 8 and 9, respectively. A prevention mechanism 14 is provided. The rotation preventing mechanism 14 is fitted into the restriction pin 14a fixed to the collar portions 6b and 10a and the first and second driven scroll receivers 13a and 13b, and the restriction pin 14a extends along the inner peripheral surface. It is composed of three or more places by the rotating anti-rotation ring 14b.

  Further, the compression spaces 12a and 12b are connected to the center side by a through hole 11d formed in the center of the driven scroll member 11, and a discharge port 8c formed in the center of the first drive scroll member 8 is formed. It The discharge port 8c communicates with a discharge hole 6a formed in the first rotating shaft 6 through a check valve hole 8d formed concentric with the rotation center line of the first rotating shaft 6. The check valve hole 8d is opened and closed by the check valve 17 including the spring 17a and the valve body 17b. The end of the spring 17a is held by a heat insulating member 18 made of a cylindrical heat insulating material (ceramics) press-fitted into the discharge hole 6a, and the end of the heat insulating member 18 is held by the face seal portion 16. It is rotatably held. As a result, it is possible to prevent the heat of compression from moving to the bearings, so that the durability can be improved.

  Further, in the second embodiment, the lubricating oil-containing refrigerant sucked from the suction ports 15A and 15B collides with the rotating first and second driven scroll receivers 13a and 13b and is agitated, whereby the refrigerant and the lubricating oil. The control pin 14a and the like can be lubricated. Further, since the rotation prevention ring 14b is made of an oil-containing sintered metal, the regulation pin 14a can smoothly rotate along the inner peripheral surface of the rotation prevention ring 14b. As a result, the driven scroll member 11 also rotates with the rotation of the first and second drive scroll members 8 and 9, but the driven scroll member 11 is prevented from rotating by the rotation preventing mechanism 14, so that the driven scroll member 11 is prevented from rotating. Since the member 11 orbits relative to the first and second drive scroll members 8 and 9, the compression spaces 12a and 12b decrease in volume from the outer peripheral portion toward the center, so that the suction port 15 The refrigerant sucked from the compressor can be compressed and discharged from the discharge port 4a.

  As described above, in the scroll compressor 1 disclosed in the second embodiment, the lubricating oil-containing refrigerant sucked from the suction ports 15A and 15B has the rotating first and second driven scroll receivers 13a and 13b. Since the lubricating oil is separated from the refrigerant by being agitated at the same time of colliding with the end portion, the rotation preventing mechanism 14 and the bearings 7a, 7b, 7c, 7d are sufficiently lubricated, and the conduction of compression heat can be further prevented. Therefore, smooth driving and improvement in durability can be achieved.

1, 1A Scroll type compressor 2 Housing 3 Working space 4 Cap part 4a Discharge port 5 Plate part 6 First rotating shaft 7a, 7b, 7c, 7d Bearing 8 First drive scroll member 8d Check valve hole 9th 2 drive scroll member 10 2nd rotating shaft 11 driven scroll member 12a, 12b compression space 13a, 13b driven scroll receiver 14 rotation prevention mechanism 15, 15A, 15B suction port 16 face seal part 17 check valve

Claims (7)

A housing, a pair of drive scroll members that are rotatably held in the housing, and a pair of drive scroll members that are sandwiched between the drive scroll members and swivel relative to the drive scroll members as the drive scroll members rotate. A driven scroll member that performs a movement, a driven scroll receiver that holds the driven scroll member rotatably with respect to the housing, and a driven scroll member that is provided between the drive scroll member side and the driven scroll member side. A drive pin and a follower scroll member, which are provided with a regulating pin fixed to the scroll member side and a rotation preventing mechanism provided on the side of the driven scroll member, the rotation preventing ring being a rotation preventing ring that rotates along the inner surface of the regulating pin. Defines a compression chamber, and the compression chamber is formed on the outer peripheral portion of the driven scroll member. And the discharge port formed in one central portion of the drive scroll member, and the volume of the compression chamber decreases from the suction port toward the discharge port as the drive scroll member rotates. In the scroll compressor, the fluid sucked from the suction port is compressed and discharged from the discharge port.
A discharge hole that is provided in one of the drive scroll members and that rotatably holds the drive scroll member is formed with a discharge hole that communicates with the discharge port, and the discharge hole is provided on the drive scroll member side. A scroll compressor provided with a check valve, wherein a check valve hole for opening and closing the check valve communicates with the discharge port, and at the same time, is concentric with a rotation center line of the rotary shaft.   The scroll compressor according to claim 1, wherein a suction port is formed in the housing at a position facing the suction port, and a urethane grease reservoir is formed at a peripheral edge of the regulation pin.   3. The scroll compressor according to claim 2, wherein a ceramic bearing having grease for a refrigerant bearing is provided to rotatably support each of the rotary shaft and the driven scroll receiver in the housing.   Suction ports are formed in the housing at two locations facing the driven scroll receiver, and oil dissolved in the refrigerant sucked from the suction port collides with the end of the driven scroll receiver to separate the oil. The scroll type compressor according to claim 1, wherein:   The scroll compressor according to any one of claims 2 to 3, wherein the rotation prevention ring is formed of an oil-containing sintered metal.   The scroll type compressor according to claim 5, wherein a cylindrical heat insulating material is press-fitted into an inner peripheral surface of a discharge port formed on the rotating shaft to hold one end of a spring for pressing the check valve. . 7. The back surface of the drive scroll member is provided with a collar portion that expands in a radial direction from a base portion of the rotating shaft, and the collar portion is formed of a material having low thermal conductivity. Scroll compressor.

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