JP2008095588A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a scroll compressor 1 which suppresses wear of a thrust bearing member 17 by improving lubricity of the thrust bearing member 17 and has superior reliability and durability. <P>SOLUTION: This scroll compressor 1 has, inside a pressure vessel: a compression mechanism 21 formed by meshing a fixed scroll 4 with a movable scroll 5 revolving with respect to the fixed scroll 4; a movable scroll supporting member 6 for supporting the movable scroll 5; plural thrust bearing members 17 arranged in a circumferential direction on the surface of the movable scroll supporting member 6 on the side of the movable scroll, stored in the movable scroll supporting member on the surface, and receiving thrust force of the movable scroll 5; an eccentric bearing 15 to which the main spindle 10 of the movable scroll 5 is fitted; and a crankshaft 12 applying rotation motion to the movable scroll 5 through eccentric fitting. The thrust bearing members 17 are formed with tapered grooves with groove width widened taperingly, and recessed parts communicated with the tapered grooves. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scroll compressor used for, for example, a vehicle air conditioner, and more particularly to a scroll compressor that improves the slidability and wear resistance of a thrust bearing portion and is suitable for using carbon dioxide as a fluid to be compressed.

  In the scroll compressor, the fluid (refrigerant) is compressed by the revolving motion of the movable scroll with respect to the fixed scroll. Further, when the movable scroll turns and compresses the fluid, a large force acts in the thrust direction on the movable scroll. For this reason, normally, a movable scroll support member is provided behind the movable scroll so that a thrust load applied to the movable scroll can be received. For example, a movable scroll support member that supports the movable scroll is provided behind the movable scroll, a concave portion is provided on the movable scroll side surface of the movable scroll support member, and a disc-shaped thrust bearing member is provided in the concave portion. A configuration that accommodates and receives the thrust force of the movable scroll is adopted.

  However, since the orbiting radius of the orbiting scroll is about several millimeters, the sliding speed becomes low, and there is a possibility that it is difficult to form and hold an oil film on the thrust bearing member. If the formation and holding of the oil film is insufficient, the sliding loss increases, and metal contact may occur between the movable scroll and the thrust bearing member, and the thrust bearing member may be worn. A clearance of 1 mm or less is provided between the concave portion of the movable scroll support member and the thrust bearing member accommodated in the concave portion in order to facilitate assembly and removal of the thrust bearing member. For this reason, since the thrust bearing member moves in the radial direction of the concave portion in accordance with the orbiting movement of the movable scroll, wear may occur between the sliding surface of the thrust bearing member on the non-movable scroll side and the movable scroll support member. There is.

For this reason, in order to improve the oil film formability and retainability of the thrust bearing member, a proposal has been made to improve the oil film formability and retainability of the thrust bearing member by forming a plurality of spiral grooves in the thrust bearing member. However, since the spiral groove is complicated in shape (for example, Patent Document 1), the number of processing steps increases, which may increase the cost of the thrust bearing member and the entire device.
Japanese Patent Laid-Open No. 8-319959

  Accordingly, an object of the present invention is to provide a scroll compressor having excellent reliability and durability at low cost by suppressing the wear of the thrust bearing member by improving the lubricity of the thrust bearing member. .

  In order to solve the above-described problems, a scroll compressor according to the present invention includes a compression mechanism in which a fixed scroll and a movable scroll revolving with respect to the fixed scroll are engaged with each other in a pressure vessel, and the movable scroll is supported. A plurality of movable scroll support members that are arranged in a circumferential direction on a surface of the movable scroll support member on the movable scroll side, and are accommodated in the movable scroll support member on the surface and receive a thrust force of the movable scroll In a scroll compressor having a bearing member, an eccentric bearing into which a main shaft of the movable scroll is fitted, and a crankshaft that imparts orbiting motion to the movable scroll via the eccentric bearing, a groove width is provided in each thrust bearing member. In addition to providing a tapered groove that expands in a tapered shape, a recessed portion that communicates with each tapered groove is provided. Consisting of those to be. In such a configuration, each thrust bearing member is provided with a tapered groove whose groove width expands in a taper shape, and a hollow portion communicating with each tapered groove is provided. Lubricating oil is taken into the tapered groove from the outer peripheral side of the member. And since the oil film surface is reliably formed and held by the lubricating oil on the entire sliding surface on the movable scroll side of the thrust bearing member, wear of the thrust bearing member is prevented and smooth slidability is secured. Therefore, the reliability and durability of the scroll compressor can be improved, and the coefficient of performance (COP) of the scroll compressor can be improved. Furthermore, since the required power during the operation of the scroll compressor is reduced by ensuring smooth slidability of the thrust bearing member, it can contribute to energy saving. In addition, since each tapered groove communicates with the recessed portion, when the lubricating oil in the tapered groove is insufficient, the lubricating oil accumulated in the recessed portion is supplied to each tapered groove as the movable scroll turns. Is done. Therefore, if the recess is provided at the substantially central portion of the thrust bearing member, the lubricating oil can be uniformly supplied to each tapered groove by the centrifugal force when the thrust bearing member slides. An oil film is formed on the entire sliding surface on the movable scroll side of the member, so that smoother slidability of the thrust bearing member can be ensured.

  The thrust bearing member has a simple structure and can be easily processed as compared with, for example, a conventional thrust bearing member in which a spiral groove is formed, so that the cost of the thrust bearing member and the scroll compressor can be reduced. Can do.

  The tapered groove and the recess are preferably provided on both surfaces of the thrust bearing member. However, if provided on at least the sliding surface of the thrust bearing member on the movable scroll side, the above-described effect is achieved and the object of the present invention is sufficiently achieved. Is possible.

  The thrust bearing member can be formed in a disc shape, but is not limited thereto, and can be formed in an elliptical shape or a polygonal shape, for example. If the thrust bearing member is formed in an elliptical shape or a polygonal shape, for example, it is possible to prevent the rotation of the thrust bearing member accommodated in the concave portion of the scroll support member.

  It is preferable to provide a crowning shape in a direction in which the surface is separated from the movable scroll on the outer peripheral portion of the thrust bearing member other than the tapered groove on the sliding surface on the movable scroll side. If such a crowning shape is provided, the contact of the movable scroll with the thrust bearing member can be weakened, so that the frictional force between the thrust bearing member and the movable scroll can be reduced. Further, in the configuration in which the recessed portion and the tapered groove are also provided on the sliding surface on the anti-movable scroll side of the thrust bearing member, the outer peripheral portion of the portion other than the tapered groove on the sliding surface on the anti-movable scroll side of the thrust bearing member, It is preferable to provide a crowning shape in which the surface is away from the movable scroll support member.

  The thrust bearing member is preferably made of a material different from that of the movable scroll and the movable scroll support member. In such a configuration, the frictional force on the contact surface between the thrust bearing member, the movable scroll, and the scroll support member can be reduced, so that galling can be effectively prevented.

  The tapered groove is preferably extended linearly from the center portion of the scroll support member toward the outer periphery in the radial direction of the scroll supporting member. According to such a configuration, for example, the taper grooves can be provided radially from the central portion of the thrust bearing member, so that an oil film can be formed on the entire sliding surface on the movable scroll side of the thrust bearing member.

  The driving source of the compression mechanism is not particularly limited, and examples thereof include a built-in motor. When the scroll compressor is used in a refrigeration system for a vehicle air conditioner, a vehicle prime mover, such as a vehicle drive motor, an engine, or the like can be used as a drive source.

  It is preferable that the movable scroll support member constitutes a part of the pressure vessel housing and is formed so that the outer diameter is substantially the same as that of the housing member located on both sides or one side thereof. In such a configuration, at least a part of the scroll support member is formed to be exposed to the outside of the scroll compressor, and the movable scroll support member is cooled by the outside air, etc., so that overheating of the scroll support member is effective. Can be prevented.

  The scroll compressor according to the present invention is particularly suitable for a scroll compressor using carbon dioxide compressed to a supercritical state as a fluid to be compressed, but uses other alternative refrigerants and lubricating oil for the alternative refrigerants. It can also be applied to scroll compressors.

  Further, the scroll compressor according to the present invention can be suitably used particularly for a refrigeration system using carbon dioxide as a refrigerant.

  According to such a scroll compressor according to the present invention, each thrust bearing member is provided with a taper groove whose groove width expands in a taper shape, and a hollow portion communicating with each taper groove is provided. An oil film surface can be reliably formed and held on the entire sliding surface on the movable scroll side of the member. Therefore, wear of the thrust bearing member is prevented and smooth slidability is ensured, so that the reliability and durability of the scroll compressor can be improved and the coefficient of performance (COP) of the scroll compressor can be improved. Furthermore, since the required power during the operation of the scroll compressor is reduced by ensuring smooth slidability of the thrust bearing member, it can contribute to energy saving. Furthermore, compared to a conventional thrust bearing member in which a spiral groove is formed, the structure is simplified and the machining is easy, which can contribute to the cost reduction of the entire apparatus.

  The thrust bearing member can be formed of a disk-shaped member, but can be formed in an elliptical shape or a polygonal shape, for example. If the thrust bearing member is formed in an elliptical shape or a polygonal shape, the thrust bearing member housed in the recess of the scroll support member can be prevented from rotating, so that the possibility of wear of the thrust bearing member can be more reliably eliminated. Can do.

  If a crowning shape is provided in the outer peripheral portion of the thrust bearing member other than the taper groove on the sliding surface on the movable scroll side, the contact of the movable scroll against the thrust bearing member is weakened. Therefore, wear of the thrust bearing member can be reliably prevented. In the present invention, a configuration in which a recess and a taper groove are also provided on the sliding surface of the thrust bearing member on the non-movable scroll side can be adopted. In this case, the thrust bearing member slides on the non-movable scroll side. If the outer peripheral portion of the surface other than the tapered groove is provided with a crowning shape in a direction in which the surface is separated from the movable scroll support member, the contact of the movable scroll support member with the thrust bearing member can be weakened. Can be reliably prevented.

  In addition, if the thrust bearing member is made of a material different from that of the movable scroll and the movable scroll support member, the frictional force on the contact surface between the thrust bearing member, the movable scroll and the scroll support member can be reduced, thereby effectively preventing galling. can do.

  Since the taper groove can be provided radially from the center portion of the thrust bearing member by extending the taper groove linearly from the center portion of the scroll support member toward the outer periphery in the radial direction thereof, the thrust bearing member An oil film can be formed on the entire sliding surface on the movable scroll side.

  If the movable scroll support member constitutes a part of the pressure vessel housing and the outer diameter of the housing member located on both sides or one side thereof is formed to be substantially the same diameter, at least a part of the scroll support member of the scroll compressor is formed. Since the movable scroll support member is formed to be exposed to the outside and cooled by outside air or the like, overheating of the scroll support member can be effectively prevented.

  The scroll compressor according to the present invention is particularly suitable for a scroll compressor using carbon dioxide compressed to a supercritical state as a fluid to be compressed, but uses other alternative refrigerants and lubricating oil for the alternative refrigerants. It can also be applied to scroll compressors. Further, the scroll compressor according to the present invention can be suitably used particularly for a refrigeration system using carbon dioxide as a refrigerant.

Hereinafter, preferred embodiments of a scroll compressor according to the present invention will be described with reference to the drawings.
1 to 4 show a scroll compressor according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a scroll compressor. In this embodiment, the scroll compressor 1 is configured as a scroll compressor using carbon dioxide as a fluid to be compressed, and is used in a refrigeration system using carbon dioxide as a refrigerant, for example, a refrigeration cycle of a vehicle air conditioner. It has become so.

  The scroll compressor 1 has a motor housing 2 and a rear housing 3. Between the motor housing 2 and the rear housing 3, there are provided a fixed scroll 4, a movable scroll 5 engaged with the fixed scroll 4 at an angle, and a movable scroll support member 6 that supports the movable scroll 5. ing. In this embodiment, the movable scroll support member 6 has an outer diameter substantially the same as that of the motor housing 2 and the rear housing 3 as shown in FIGS. 1 and 2, and the motor housing 2, the rear housing 3, A part of the pressure vessel housing 7 is configured together with the fixed scroll 4. A plurality of motor housings 2, rear housings 3, fixed scrolls 4 and movable scroll support members 6 are provided in the circumferential direction and fastened by fastening bolts 8.

  An electric motor 9 is built in the motor housing 2, and the main shaft 10 of the movable scroll 5 is connected to the electric motor 9. A crank mechanism 11 is integrally formed at one end of the main shaft 10, and a crank pin 12 of the crank mechanism 11 is fitted to an eccentric bush 13. The eccentric bush 13 is inserted into an eccentric bearing 15 provided in the protrusion 14 of the movable scroll 6.

  A plurality of concave portions 16 as shown in FIG. 3 are provided in the circumferential direction on the surface of the movable scroll support member 6 on the movable scroll side, and the thrust bearing member 17 that receives the thrust force of the movable scroll 5 is provided in the concave portion 16. Is housed. In FIG. 3, the thrust bearing member 17 does not display a cross section, but is hatched to clearly show the thrust bearing member 17 with respect to other parts.

  The thrust bearing member 17 is composed of a disk-shaped member as shown in FIG. In this embodiment, the thrust bearing member 17 is made of a material different from that of the movable scroll 5 and the movable scroll support member 6. A hollow portion 19 is provided at a substantially central portion of the thrust bearing member 17, and a tapered groove 18 a is communicated with the hollow portion 19. The taper groove 18 a extends linearly from the central portion of the thrust bearing member 17 toward the radially outer side of the thrust bearing member 17. The taper groove 18a is formed in a taper groove whose groove width gradually increases in the radial direction, and in the present embodiment, the depth of the taper groove 18a is set to about 50 μm, while the depression portion The depth of 19 is set to about 100 μm. In the present embodiment, the tapered groove 18a and the hollow portion 19 as described above are formed on both surfaces of the sliding surface 17a on the movable scroll side and the sliding surface 17b on the counter-movable scroll side of the thrust bearing member 17. .

  As shown in FIGS. 4 and 5, the outer peripheral portion 18 c of the portion 18 b other than the tapered groove of the sliding surface 17 a on the movable scroll side of the thrust bearing member 17 is provided with a crowning shape in which the surface is away from the movable scroll 5. Has been. In FIG. 4, the outer peripheral portion 18 c to which the crowning shape is imparted does not display a cross section, but other portions are hatched to clearly indicate the crowning shape imparting portion. On the other hand, the outer peripheral portion 18 c of the portion 18 b other than the tapered groove of the sliding surface 17 b on the counter-movable scroll side of the thrust bearing member 17 is provided with a crowning shape in which the surface is away from the movable scroll support member 6. Thus, if the crowning shape is given to the outer peripheral portion 18c of the portion 18b other than the taper groove, the contact of the movable scroll 5 and the movable scroll support member 6 with the thrust bearing member 17 can be weakened. Can be more effectively prevented.

  In the scroll compressor 1 shown in FIG. 1, the carbon dioxide refrigerant taken into the pressure vessel from the suction port 20 is taken into the fluid pocket of the compression mechanism 21 including the fixed scroll 4 and the movable scroll 5. As the movable scroll 5 revolves, the fluid pocket moves toward the center of the compression mechanism 21 while gradually reducing its volume, and the carbon dioxide refrigerant is discharged into the discharge chamber 23 through the discharge hole 22. Further, it is sent to the outside through the discharge port 24.

  In the present embodiment, each thrust bearing member 17 is provided with a taper groove 18a whose groove width expands in a taper shape, and a hollow portion 19 communicating with each taper groove 18a is provided. Accordingly, the lubricating oil is taken into the tapered groove 18a from the outer peripheral side of the thrust bearing member 17. The lubricating oil reliably forms and holds the oil film surface on the entire sliding surface 17a on the movable scroll side of the thrust bearing member 17, so that wear of the thrust bearing member 17 is prevented and smooth slidability is ensured. The Therefore, the reliability and durability of the scroll compressor 1 can be improved, and the coefficient of performance (COP) of the scroll compressor 1 can be improved. Furthermore, by ensuring smooth slidability of the thrust bearing member 17, the required power during the operation of the scroll compressor is reduced, which can contribute to energy saving. Further, since each tapered groove 18a communicates with the recessed portion 19, when the lubricating oil in the tapered groove 18a is insufficient, the lubrication accumulated in the recessed portion 19 as the thrust bearing member 17 slides. Oil is supplied to each tapered groove 18a. For this reason, in this embodiment, the hollow portion 19 is provided in the substantially central portion of the thrust bearing member 17. Since the lubricating oil can be uniformly supplied to each tapered groove 18a by the centrifugal force when the thrust bearing member 17 slides, an oil film is formed on the entire sliding surface 17a on the movable scroll side of the thrust bearing member 17. Further, smoother slidability of the thrust bearing member 17 can be ensured. Further, the thrust bearing member 17 has a simple structure and can be easily processed as compared with, for example, a conventional thrust bearing member in which a spiral groove is formed. Can contribute to down.

  In the present embodiment, the tapered groove 18 and the recess 19 are formed on both the sliding surface 17 a and the sliding surface 17 b of the thrust bearing member 17, so that the thrust bearing member 17 slides. Wear can be reliably prevented. However, if the tapered groove 18 and the hollow portion 19 are provided at least on the sliding surface 17a on the movable scroll side of the thrust bearing member 17, the above-described effect can be obtained and the object of the present invention can be sufficiently achieved.

  Further, since the thrust bearing member 17 is formed of a material different from that of the movable scroll 5 and the movable scroll support member 6, the contact surface with the sliding surface 17 a and the movable scroll 5, the sliding surface 17 b, the scroll support member 6, and the like. Since the frictional force on the contact surface can be reduced, it is possible to effectively prevent galling.

  In the present embodiment, the tapered groove 18 is linearly extended from the central portion of the scroll support member 17 toward the outer periphery in the radial direction of the scroll support member 17. According to such a configuration, for example, the tapered groove 18a can be provided radially from the central portion of the thrust bearing member 17, so that an oil film is formed on the entire sliding surface 17a on the movable scroll side of the thrust bearing member 17. Can do.

  In addition, the movable scroll support member 6 in this embodiment constitutes a part of the pressure vessel housing 7, and the outer diameters of both the side housings 2 and 3 are formed to be substantially the same. The part is formed in a state exposed to the outside of the scroll compressor 1. For this reason, since the movable scroll support member 6 is effectively cooled by outside air or the like, the scroll support member 6 can be effectively prevented from being overheated, thereby contributing to improvement in durability and reliability of the apparatus.

  The scroll compressor according to the present invention is particularly suitable for a scroll compressor that uses carbon dioxide that is compressed to a critical state as a fluid to be compressed. However, the scroll that uses other alternative refrigerant and lubricating oil for the alternative refrigerant is used. It can also be applied to a compressor. The scroll compressor according to the present invention is particularly suitable for a refrigeration system using carbon dioxide as a refrigerant, for example, a scroll compressor of a refrigeration system for a vehicle air conditioner.

It is a longitudinal cross-sectional view of the scroll compressor which concerns on one embodiment of this invention. It is a partial expanded longitudinal cross-sectional view of the scroll compressor of FIG. FIG. 3 is a III arrow view of the scroll compressor of FIG. 1. It is a front view of the thrust bearing member used for the scroll compressor of FIG. It is a partial expanded sectional view of the outer peripheral part of the thrust bearing member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Motor housing 3 Rear housing 4 Fixed scroll 5 Movable scroll 6 Movable scroll support member 7 Pressure vessel housing 8 Fastening bolt 9 Electric motor 10 Main shaft 11 Crank mechanism 12 Crank pin 13 Eccentric bush 14 Protrusion 15 Eccentric bearing 16 Concave 17 Thrust bearing member 17a Sliding surface on the movable scroll side 17b Sliding surface on the non-movable scroll side 18a Tapered groove 18b Parts other than the tapered groove 18c Outer peripheral portion 19 Depressed portion 20 Suction port 21 Compression mechanism 22 Discharge hole 23 Discharge chamber 24 Discharge port

Claims (10)

  A compression mechanism in which a fixed scroll and a movable scroll that orbits with respect to the fixed scroll are engaged with each other inside the pressure vessel, a movable scroll support member that supports the movable scroll, and a movable scroll side of the movable scroll support member. A plurality of circumferentially arranged on the surface, accommodated in the movable scroll support member on the surface and receiving a thrust force of the movable scroll; an eccentric bearing to which the main shaft of the movable scroll is fitted; In the scroll compressor having a crankshaft that imparts orbiting motion to the movable scroll via the eccentric bearing, each thrust bearing member is provided with a taper groove whose groove width expands in a taper shape and communicates with each taper groove. A scroll compressor provided with a recess.   The scroll compressor according to claim 1, wherein the thrust bearing member is a disk-shaped member.   The scroll compression according to claim 1 or 2, wherein a crowning shape in which the surface is separated from the movable scroll is provided on an outer peripheral portion of the thrust bearing member other than the tapered groove on the sliding surface on the movable scroll side. Machine.   The scroll compressor according to claim 1, wherein the thrust bearing member is made of a material different from that of the movable scroll and the movable scroll support member.   The scroll compressor according to any one of claims 1 to 4, wherein the hollow portion is provided at a substantially central portion of the thrust bearing member.   The scroll compressor according to any one of claims 1 to 5, wherein the tapered groove is linearly extended from the central portion of the thrust bearing member toward the outside in the radial direction of the thrust bearing member.   The scroll compressor according to claim 1, wherein a driving source of the compression mechanism is a built-in motor.   The movable scroll support member constitutes a part of the housing of the pressure vessel, and the outer diameter of the housing member located on both sides or one side thereof is formed to be substantially the same. The scroll compressor in any one of 1-7.   The scroll compressor according to any one of claims 1 to 8, wherein the fluid to be compressed is made of carbon dioxide. The scroll compressor according to claim 9, wherein the compressor is used in a refrigeration system using carbon dioxide as a refrigerant.

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