JP2006029252A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability of support of a turning scroll and an eccentric shaft of a scroll compressor. <P>SOLUTION: Part of lubricating oil 7 supplied to an oil reservoir 22is supplied to an inner surface of a tube part 12b via an oil groove 12c to prevent wear of a sliding part of an eccentric bearing 43 and an outer wheel 43b and to improve reliability of the compressor by providing the oil groove 12c on the inner surface of the tube part 12b on a back surface side of the turning scroll 12 in which the eccentric bearing 43 is slidably stored with a gap held. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scroll compressor applied to an air conditioning and refrigeration apparatus.

Conventionally, this type of compressor has a movable scroll supported by an eccentric shaft via a bush so that it can revolve, and a ball bearing is interposed between the bush and the movable scroll (for example, see Patent Document 1). ). In Patent Document 1, a cylindrical boss portion for housing a ball bearing is provided on the back surface of the movable scroll substrate, and the bush is fitted to the inner ring of the ball bearing so as not to move relative to the movable scroll substrate. The outer ring of the ball bearing is fitted so as not to move relative to the movable scroll substrate so that the bush and the inner ring of the ball bearing do not come into contact with the movable scroll substrate.
JP 2002-371975 A

  By the way, as a method of fitting the ball bearing so as not to move as described above, generally, the inner diameter of the cylindrical portion is set to be press-fit fixed slightly smaller than the outer diameter of the outer ring of the ball bearing in consideration of the thermal expansion due to the material difference. Is used.

  However, during the press-fitting, the end portion of the orbiting scroll swells in the radial direction, so that the end plate is deformed, and further, a spiral wrap formed upright on the end plate is deformed.

  In order to secure the degree of sealing of the compression mechanism that affects the performance of the scroll compressor, the flatness of the orbiting scroll end plate and the fixed scroll end plate as the compression mechanism is ensured, and a spiral wrap is used with reference to the end plate. By controlling the height, the clearance when the orbiting scroll and the fixed scroll are combined can be maintained by keeping the clearance below a certain value. Therefore, it is expected that the deformation of the orbiting scroll will deteriorate the sealing performance of the compression mechanism part and reduce the performance.

  Therefore, in order to suppress the deformation, a method of setting the inner diameter of the cylindrical portion on the back surface of the end plate of the orbiting scroll to be larger than the outer diameter of the outer ring of the ball bearing and slidably fitting as a so-called loose is conceivable. However, in this case, the outer ring of the ball bearing rotates during operation of the compressor, and wear may occur on the inner surface of the cylindrical portion during long-time operation.

  In order to solve the above-described conventional problems, a compressor according to the present invention includes an electric motor housed in a container, and an orbiting scroll that is driven by the electric motor and has a spiral wrap formed upright on an end plate. And a compression mechanism portion composed of a fixed scroll that is combined with the orbiting scroll to form a spiral wrap upright on the end plate, and has a cylindrical portion that is formed on the rear surface of the end plate of the orbiting scroll and accommodates a bearing. In the compressor, the orbiting scroll and the bearing are slidably fitted, and an oil groove is formed on the inner surface of the cylindrical portion for guiding lubricating oil for lubrication between the inner surface of the cylindrical portion and the outer ring outer surface of the bearing.

As a result, when the inner diameter of the cylinder part on the back of the end plate of the orbiting scroll is set larger than the outer diameter of the outer ring of the ball bearing, when the bearing outer ring rotates during compressor operation, lubricating oil is supplied between the inner surface of the cylinder part and the outer surface of the bearing outer ring. Therefore, wear on the inner surface of the cylinder portion can be prevented. Further, since the orbiting scroll and the bearing are slidably fitted, deformation of the orbiting scroll at the time of fitting can be prevented, and the influence on performance can be reduced.

  The compressor of the present invention can prevent performance degradation without impairing reliability.

  According to a first aspect of the present invention, there is provided a compressor according to the present invention, an electric motor housed in a container, an orbiting scroll that is driven by the electric motor and that is formed with upright spiral wraps on an end plate, and an orbiting scroll In a scroll compressor provided with a compression mechanism composed of a fixed scroll formed in an upright form with a spiral wrap on the end plate, and a cylindrical portion formed on the back surface of the end plate of the orbiting scroll and containing a bearing, The orbiting scroll and the bearing are slidably fitted to each other, and an oil groove that guides lubricating oil for lubrication between the inner surface of the cylindrical portion and the outer ring outer surface of the bearing is formed on the inner surface of the cylindrical portion. Wear on the inner surface can be prevented. Further, since the orbiting scroll and the bearing are loosely fitted, deformation of the orbiting scroll at the time of fitting can be prevented and performance degradation can be prevented.

  In the second aspect of the invention, in particular, since the oil groove of the first aspect of the invention is formed in the circumferential direction of the inner surface of the cylindrical portion, the lubricating oil can be more effectively supplied to the entire inner circumference, further improving the reliability. Can be improved.

  In the third invention, in particular, the oil groove of the first invention is formed at the time of molding of the orbiting scroll, so that no special post-processing is required, and the processing cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a compressor in the first embodiment of the present invention.

  FIG. 1 shows an example of a horizontal scroll compressor installed sideways by means of mounting legs 2 around the body of the scroll compressor 1, and the scroll compressor 1 is compressed into its main casing 3. A mechanism part 4 and an electric motor 5 that drives the mechanism part 4 are built in, and a liquid storage part 6 that stores liquid used for lubrication of each sliding part including the compression mechanism part 4 is provided. It is made to drive by a circuit part. The refrigerant to be handled is a gas refrigerant, and a liquid such as a lubricating oil 7 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 7 is compatible with the refrigerant. However, the present invention is not limited to these. Basically, a compression mechanism portion 4 that sucks, compresses and discharges liquid, an electric motor 5 that drives the compression mechanism portion 4, and a liquid that is used for lubrication of each sliding portion including the compression mechanism portion 4. The storage unit 6 that stores the liquid is stored in the main body casing 3 and the electric motor 5 is driven by the motor drive circuit unit as long as it is a scroll compressor 1. The following description is not intended to limit the description of the scope of claims. Absent.

  The compression mechanism section 4 of the scroll compressor 1 according to the present embodiment is configured such that the compression space 10 formed by meshing the fixed scroll 11 and the orbiting scroll 12 drives the orbiting scroll 12 by the electric motor 5 as shown in FIG. The sub casing 80 is provided with suction, compression, and discharge to the external cycle of refrigerant returning from the external cycle by changing the volume accompanying the movement when the fixed scroll 11 is swung through the shaft 14. This is done through the suction port 8 and the discharge port 9 provided in the main casing 3.

At the same time, the lubricating oil 7 stored in the liquid storage part 6 of the main casing 3 is replaced with the positive displacement pump 1.
3 or the like is driven by the drive shaft 14, or the differential pressure in the main body casing 3 is used, and the liquid pool on the back surface of the orbiting scroll 12 is driven by the orbiting scroll 12 through the oil supply passage 15 of the drive shaft 14. 21 and the liquid reservoir 22 are supplied to the liquid reservoir 21 in the example shown in the figure. A part of the lubricating oil 7 supplied to the liquid reservoir 21 is supplied to the rear side of the outer peripheral portion of the orbiting scroll 12 through the orbiting scroll end plate 12a based on a predetermined restriction by the diaphragm 23 or the like to back up the orbiting scroll 12. Meanwhile, the lubricating oil 7 is supplied through the orbiting scroll 12 to the holding groove 25 that holds the tip seal 24 that is an example of the sealing member between the spiral scroll of the orbiting scroll 12 and the fixed scroll 11 at the tip, and is fixed. Sealing and lubrication between the orbiting scrolls 11 and 12 are achieved. Further, another part of the lubricating oil 7 supplied to the liquid reservoir 21 flows out to the electric motor 5 side after lubricating the bearings 42 and 43 through the eccentric bearing 43, the liquid reservoir 22 and the main bearing 42. Then, the liquid is collected into the liquid storage unit 6.

  Further, a main bearing member 51 having a pump 13, a secondary bearing 41, an electric motor 5, and a main bearing 42 is disposed in this order from the one end wall 3 a side in the axial direction in the main body casing 3. The pump 13 is housed from the outer surface of the end wall 3a and is held between the lid body 52 and the pump body 53 that is fitted thereafter, and a pump chamber 53 that communicates with the liquid storage section 6 is formed inside the lid body 52 to form a suction passage. 54 is connected to the liquid storage section 6 through 54. The auxiliary bearing 41 is supported by the end wall 3a, and the side connected to the pump 13 of the drive shaft 14 is supported.

  The electric motor 5 fixes the stator 5a to the inner periphery of the main body casing 3 by shrink fitting, and the drive shaft 14 can be rotationally driven by the rotor 5b fixed around the drive shaft 14. The main bearing member 51 is fixed to the inner periphery of the sub casing 80 with bolts 17 or the like, and the compression mechanism portion 4 side of the drive shaft 14 is supported by the main bearing 42.

  The fixed scroll 11 is attached to the outer surface of the main bearing member 51 with a bolt or the like (not shown), and the orbiting scroll 12 is sandwiched between the main bearing member 51 and the fixed scroll 11 to constitute a scroll compressor. Between the main bearing member 51 and the orbiting scroll 12, a rotation restraining portion 57 for preventing the orbiting scroll 12 such as an Oldham ring from rotating and causing a circular movement is provided. An eccentric shaft 14a is integrally formed on the end surface of the drive shaft 14, and a bush 30 is fitted and supported on the eccentric shaft 14a.

  The orbiting scroll 12 is supported by the bush 30 via an eccentric bearing 43 so as to be capable of orbiting movement so as to face the fixed scroll 11. A cylindrical portion 12b projects from the rear surface of the orbiting scroll end plate 12a of the orbiting scroll 12, and the eccentric bearing 43 is accommodated in the cylindrical portion 12b. An inner ring 43a of the eccentric bearing 43 is fitted to the bush 30 and an outer ring 43b of the eccentric bearing 43 is fitted to the cylindrical portion 12b so as to be slidable with a gap.

  The exposed portion of the compression mechanism section 4 from the sub casing 80 is covered with the main casing 3 which is fixed to the sub casing 80 and the opening by abutting the openings, and the end wall 80a opposite to the end wall 3a in the axial direction. Is forming. The compression mechanism unit 4 is located between the suction port 8 of the sub casing 80 and the discharge port 9 of the main casing 3, and its own suction port 16 is connected to the suction port 8 of the sub casing 80, and its own discharge port 31 is A discharge chamber 62 is formed between the reed valve 31a and the end wall 80a. The discharge chamber 62 is an electric type having a discharge port 9 between the compression mechanism portion 4 and the end wall 3a through the fixed scroll 11 and the main bearing member 51 or a communication passage 63 formed between them and the main body casing 3. It leads to the motor 5 side.

As described above, the electric motor 5 is driven by the motor drive circuit unit, and the compression mechanism unit 4 is swung through the drive shaft 14 and the pump 13 is driven. At this time, the compression mechanism section 4 is supplied with the lubricating oil 7 of the liquid storage section 6 by the pump 13 and is subjected to lubrication and sealing action, while passing through the suction port 8 of the subcasing 80 and the suction port 16 provided in its fixed scroll 11. The return refrigerant from the refrigeration cycle is sucked and compressed, and discharged from its own discharge port 31 to the discharge chamber 62. The refrigerant discharged into the discharge chamber 62 enters the electric motor 5 side through the communication passage 63, and in the process until the electric motor 5 is cooled and discharged from the discharge port 9 of the main body casing 3, the refrigerant collides and throttles. The sub-bearing 41 is also lubricated by the accompanying part of the lubricating oil 7 while undergoing separation of the lubricating oil 7 by performing gas-liquid separation.

  Here, in this embodiment, as shown in FIG. 1 and FIG. 2 when the orbiting scroll 12 is viewed from the back of the end plate, an oil groove 12c that guides the lubricating oil 7 to the inner surface of the cylindrical portion 12b of the orbiting scroll 12 in particular. The basic configuration is that Here, the oil groove 12c is formed in the axial direction.

  According to the above configuration, a part of the lubricating oil 7 supplied to the liquid reservoir 22 is supplied to the oil groove 12c, and on the inner surface of the cylindrical portion 12b of the orbiting scroll 12 as the outer ring 43b of the eccentric bearing 43 rotates. Supplied. Therefore, even when the outer ring 43b of the eccentric bearing 43 is fitted to the cylindrical portion 12b with a gap in order to prevent the turning scroll 12 from being deformed and prevent the performance from being deteriorated, the inner surface of the cylindrical portion 12b can be prevented from being worn. In addition, as shown in FIG. 3, lubrication of the inner surface of the cylinder part 12b is further promoted by providing a plurality of oil grooves 12c on the inner surface of the cylinder part 12b.

(Embodiment 2)
FIG. 4 shows a cross-sectional view of the orbiting scroll 12 according to the second embodiment of the present invention.

  Here, in the present embodiment, the oil groove 12c is formed in the circumferential direction in addition to the axial direction of the inner surface of the cylindrical portion 12b. Thereby, the lubricating oil 7 can be more effectively supplied to the entire inner periphery, and the reliability of the sliding portion can be further improved.

  In the third embodiment of the present invention, the oil groove 12c is formed when the orbiting scroll is molded, so that no special post-processing is required, and the processing cost can be reduced.

  As described above, the scroll compressor according to the present invention can prevent deformation of the orbiting scroll and improve the reliability of the sliding portion with the bearing, and thus can be applied to a compressor without a built-in electric motor. .

Sectional drawing of the compressor in Embodiment 1 of this invention The rear view of the turning scroll end plate of the compressor in Embodiment 1 of this invention The rear view of the orbiting scroll end plate which shows other embodiment in Embodiment 1. FIG. Sectional drawing of the turning scroll of the compressor in Embodiment 2 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll compressor 3 Main body casing 4 Compression mechanism part 5 Electric motor 7 Lubricating oil 11 Fixed scroll 12 Orbiting scroll 12a Orbiting scroll end plate 12b Cylindrical part 12c Oil groove 43 Eccentric bearing 43a Inner ring 43b Outer ring 80 Sub casing

Claims (3)

An electric motor housed in a container, an orbiting scroll driven by the electric motor and formed with a spiral wrap upright on the end plate, and a spiral wrap upright on the end plate combined with the orbiting scroll A scroll mechanism including a compression mechanism portion formed of a fixed scroll formed as described above, and a cylinder portion formed on the back surface of the end plate of the orbiting scroll and containing a bearing, wherein the cylinder portion and the bearing slide A scroll compressor that is formed in the inner surface of the cylinder portion so that it can be fitted and an oil groove for guiding lubricating oil used for lubrication between the inner surface of the cylinder portion and the outer surface of the outer ring of the bearing is formed. The scroll compressor according to claim 1, wherein the oil groove is formed in a circumferential direction of the inner surface of the cylindrical portion. The scroll compressor according to claim 1, wherein the oil groove is formed in a concave shape in a casting material of the orbiting scroll.

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