JP2007182774A - Scroll type fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll type fluid machine capable of securing lubricity of a bearing and a rotation prevention mechanism. <P>SOLUTION: The rotation prevention mechanism 46 includes a fixed side plate 58 preventing rotation of a movable scroll without disturbing revolution motion of the movable scroll 32 and supported by a front housing 6, a movable side plate 48 supported by a back surface side of the movable scroll and including a mixing member 96 mixing lubricating oil from an oil storage chamber 86 at an outer circumference edge part near a suction chamber 74, and the spherical member 85 gripped between each plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll type fluid machine, for example, a scroll type fluid machine suitable as a compressor for a refrigeration circuit constituting an air conditioning system.

  This type of scroll type fluid machine, for example, a scroll type compressor, is provided with a scroll unit that performs a series of refrigerant suction, compression, and discharge processes. Specifically, this unit includes fixed and movable scrolls that mesh with each other, and the movable scroll revolves around the axis of the fixed scroll without rotating. Thereby, the volume of the space formed by each scroll is reduced, and the above-described series of processes is performed.

Here, in order to perform the orbiting movement of the movable scroll, it is necessary to prevent the rotation of the movable scroll without preventing the revolution of the movable scroll around the rotation axis. Therefore, a ball coupling is provided as a rotation blocking mechanism on the back side of the movable scroll (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-232286

  By the way, the refrigerant usually contains lubricating oil. Lubricating oil in the refrigerant not only lubricates the sliding surfaces and bearings in the compressor, but also functions as a seal for the sliding surfaces. When this lubricating oil circulates in the refrigeration circuit, cooling of the refrigeration circuit There is a compressor with a built-in lubricating oil separation device because it becomes a factor of reducing the capacity. In the apparatus, the lubricating oil is separated from the compressed refrigerant in the process until the refrigerant compressed in the compressor is guided from the discharge chamber to the discharge port, and the lubricating oil separated from the refrigerant is stored in the lower oil storage chamber. The lubricating oil in the oil storage chamber is supplied to the suction chamber via a return path.

However, this return path is formed on the outer peripheral side of the fixed scroll, specifically, on the bottom side of the suction chamber. In other words, the lubricating oil supplied from the oil storage chamber to the suction chamber tends to stay near the bottom side, and even if the movable scroll comes into contact with the lubricating oil staying with its turning, each bearing and rotation prevention There is a problem that effective lubrication of the mechanism is difficult.
The present invention has been made in view of such a problem, and an object of the present invention is to provide a scroll type fluid machine that can ensure lubricity of a bearing and a rotation prevention mechanism.

  In order to achieve the above object, a scroll type fluid machine according to claim 1 is connected to a front housing and a front housing, and is connected to a suction chamber for working fluid containing lubricating oil, a discharge chamber connected to the suction chamber, and a discharge chamber. A housing composed of a rear housing having a discharge port, a rotating shaft extending through the front housing and rotatably supported by a front housing via a bearing, and housed in the rear housing and driven by the rotating shaft to A scroll unit that performs a series of processes of suction, compression, and discharge, a separation chamber that is housed in the rear housing and positioned between the discharge chamber and the discharge port, and is separated below the separation chamber. An oil storage chamber for storing lubricating oil, a lubricating oil separation device for separating the lubricating oil from the working fluid in the separation chamber, and a scroll unit. The movable scroll is driven by a rotary shaft and revolves around the axis of the fixed scroll, a communication path that is drilled in the fixed scroll and supplies lubricating oil in the oil storage chamber to the suction chamber, and a movable scroll A rotation prevention mechanism that prevents the rotation of the movable scroll without interfering with the orbiting revolution, and the rotation prevention mechanism is supported on the fixed side plate supported by the front housing and on the back side of the movable scroll, and in the vicinity of the suction chamber. The outer peripheral edge portion includes a movable plate having a stirring member for stirring the lubricating oil from the oil storage chamber, and a spherical member sandwiched between the plates.

  Further, the invention described in claim 2 is characterized in that the stirring member is disposed at a predetermined angle that promotes stirring of the lubricating oil with respect to the outer peripheral edge of the movable side plate.

  Therefore, according to the scroll type fluid machine of the first aspect of the present invention, the stirring member is provided in the outer peripheral edge portion of the movable side plate near the suction chamber, and the lubricant that reaches the suction chamber from the oil storage chamber is moved to the movable scroll. Stirring with the turning of the. In other words, the lubricating oil in the suction chamber is positively agitated and supplied to the bearing and rotation prevention mechanism, so that the lubricity of the bearing and the like is ensured and the durability of the compressor is improved, and as a result, the reliability of the compressor It contributes to the improvement.

  According to the second aspect of the present invention, the lubricating oil in the suction chamber is more actively stirred as the movable scroll turns.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a scroll type fluid machine according to this embodiment. This fluid machine is a scroll compressor 2 and is incorporated in a refrigeration circuit of a vehicle air conditioning system. Specifically, the compressor 2 sucks the refrigerant from the evaporator, compresses the refrigerant, and discharges the refrigerant toward the condenser. The refrigerant contains lubricating oil, and this lubricating oil not only lubricates the bearings and various sliding surfaces in the compressor 2 but also functions to seal the sliding surfaces.

The compressor 2 includes a housing 4 arranged horizontally. The housing 4 is formed of a front housing 6 and a rear housing 8, and the housings 6 and 8 are flanged to each other via a plurality of connecting bolts 10.
A rotary shaft 12 is disposed in the front housing 6, and the rotary shaft 12 has a large-diameter end portion 14 located on the rear housing 8 side and a small-diameter shaft portion 16 protruding from the front housing 6 via a lip seal 22. And have. The large diameter end portion 14 is rotatably supported by the front housing 6 via a needle bearing 18 and the small diameter shaft portion 16 is rotatably supported by a front housing 6.

  A driving pulley 26 incorporating an electromagnetic clutch 24 is attached to the protruding end of the small diameter shaft portion 16, and this driving pulley 26 is rotatably supported by the front housing 6 via a bearing 28. The power of the engine of the vehicle is transmitted to the drive pulley 26 via a drive belt (not shown), and the rotation of the drive pulley 26 can be transmitted to the rotary shaft 12 via the electromagnetic clutch 24. Therefore, when the electromagnetic clutch 24 is turned on while the engine is being driven, the rotary shaft 12 rotates integrally with the drive pulley 26.

  On the other hand, the rear housing 8 has a cup shape having a bottomed portion, and a scroll unit 30 is accommodated in the rear housing 8. The scroll unit 30 includes a movable scroll 32 and a fixed scroll 34 that mesh with each other. The meshing of these scrolls 32, 34 forms a compression chamber 36 therein, and the volume of the compression chamber 36 is increased or decreased with the orbiting motion of the movable scroll 32 relative to the fixed scroll 34.

  In order to impart a turning motion to the movable scroll 32 described above, a boss 38 that protrudes toward the large-diameter shaft portion 14 is provided on the back side of the movable scroll 32, and this boss 38 is interposed via a needle bearing 44. The eccentric bush 42 is rotatably supported. The eccentric bush 42 is supported by the crank pin 40, and the crank pin 40 protrudes eccentrically from the large diameter shaft portion 14. Therefore, as the rotary shaft 12 rotates, the movable scroll 32 is swung through the crank pin 40 and the eccentric bush 42. A counterweight 66 is attached to the eccentric bush 42 and serves as a balance weight for the orbiting movement of the movable scroll 32.

  Further, the rotation of the movable scroll 32 is prevented by a ball coupling (rotation prevention mechanism) 46. That is, the ball coupling 46 includes a movable ring plate (movable plate) 48 supported on the back side of the movable scroll 32, a fixed ring plate (fixed plate) 58 supported by the front housing 6, The ball (spherical member) 65 is sandwiched between the plates 48 and 58 and prevents the movable scroll 32 from rotating about the axis of the needle bearing 44.

  The fixed scroll 34 is fixed in the rear housing 8 via a plurality of fixing bolts (not shown), and a discharge chamber 68 is formed between the fixed scroll 34 and the bottomed portion of the rear housing 8. Specifically, the space on the back side of the fixed scroll 34 and the bottomed portion of the rear housing 8 is vertically divided, and a discharge chamber 68 and an oil storage chamber 86 are formed, respectively. The fixed scroll 34 has a discharge hole 70 that allows the compression chamber 36 and the discharge chamber 68 to communicate with each other. The discharge hole 70 is opened and closed by a discharge valve 72 that is bolted to the fixed scroll 34.

On the other hand, a suction chamber 74 is secured between the peripheral wall of the rear housing 8 and the scroll unit 30, and the suction chamber 74 is connected to the above-described evaporator. Further, a discharge port 76 is formed above the bottomed portion of the rear housing 8, and this discharge port 76 is connected to a condenser, and is also connected to a discharge chamber 68 via a lubricating oil separating device 78. .
Specifically, the lubricating oil separation device 78 is disposed in the rear housing 8 between the discharge chamber 68 and the discharge port 76. A separation chamber 80 is formed in the bottomed portion of the rear housing 8, and a separation tube 82 is press-fitted into the upper portion of the separation chamber 80. An annular space is formed between the inner peripheral surface of the separation chamber 80 and the outer peripheral surface of the separation tube 82, and the bottom portion of the rear housing 8 communicates the discharge chamber 58 with this annular space 2. Two refrigerant ejection holes 84 are formed vertically.

The oil storage chamber 86 communicates with the separation chamber 80 through an oil hole 88. A return path (communication path) 90 that communicates between the oil storage chamber 86 and the suction chamber 74 is secured on the outer peripheral side of the fixed scroll 34, and an orifice 94 having a filter 92 is inserted into the return path 90. Yes.
Here, in the present embodiment, the ball coupling 46 described above agitates the lubricating oil in the suction chamber 74 as the movable scroll 32 turns. More specifically, as shown in FIG. 2, the movable ring plate 48 has a disk-shaped plate body 49, and the engagement of the plate body 49 is engaged with the outer peripheral side of the boss 38 on the inner peripheral side. A joint portion 50 is formed. The plate body 49 is formed with 14 annular race grooves 51, and these race grooves 51 are arranged at equal intervals in the circumferential direction of the plate body 49. Each race groove 51 is provided with a recess 52 for rolling the ball 65, and is recessed toward the movable scroll 32 except for the central portion of the race groove 51.

  Three ribs (stirring members) 96 are disposed along the outer peripheral edge of the outer peripheral edge of the movable-side ring plate 48 in the vicinity of the suction chamber 74. These ribs 96 are integrally formed with the movable ring plate 48 as shown in FIG. 5B, and are extended along the axial direction of the rotary shaft 12 so as not to contact the fixed ring plate 58. ing.

In the plate main body 49, three pin holes 53 are formed between the race groove 51 and the engaging portion 50, and the pins 54 are inserted into the pin holes 53 so that the movable ring plate 48 is formed. It is fixed to the movable scroll 32 (FIG. 1). Further, the fixed side ring plate 58 is also fixed to the front housing 6 via pins 64.
According to the compressor 2 described above, the ball 65 rolls along the recess 52 in the race groove 51 as the rotary shaft 12 rotates, and the movable scroll 32 performs a turning motion without rotating. This orbiting movement of the movable scroll 32 performs steps of sucking, compressing and discharging the refrigerant from the suction chamber 74 into the compression chamber 36, and the high-pressure refrigerant is discharged from the compression chamber 36 through the discharge valve 72 to the discharge chamber 68. It is discharged inside. Here, since the refrigerant contains lubricating oil, the lubricating oil lubricates the needle bearings 18 and 44 in the front housing 6, the sliding surface in the scroll unit 30, and the like. Also useful for sealing.

  The compressed refrigerant in the discharge chamber 68 passes through the refrigerant ejection hole 84 and flows into the separation chamber 80, and descends while turning around the outer peripheral surface of the separation pipe 82. In this process, the compressed refrigerant rises through the separation pipe 82 and reaches the discharge port 76, and is sent from the discharge port 76 toward the condenser. On the other hand, the lubricating oil in the compressed refrigerant is separated from the refrigerant based on the principle of centrifugal separation, and flows down along the inner peripheral surface of the separation chamber 80. The lubricating oil is guided and stored in the oil storage chamber 86 through the oil hole 88.

  Here, since the oil storage chamber 86 is always in communication with the separation chamber 80, its internal pressure is higher than the pressure of the suction chamber 74. Therefore, the lubricating oil in the oil storage chamber 86 is returned toward the suction chamber 74 through the orifice 94 based on the pressure difference between the oil storage chamber 86 and the suction chamber 74. When the lubricating oil is returned from the orifice 94 into the suction chamber 74, the lubricating oil is atomized and jetted into the suction chamber 74. In this case, the movable side ring plate 48 also turns along with the turning of the movable scroll 32 in which the rotation is restricted, so that the lubricating oil in the suction chamber 74 is agitated by the rib 96 and the needle bearings 18, 44 and the ball coupling 46. In addition, it is supplied toward the compression chamber 36.

  As described above, according to the present embodiment, the rib 96 is provided on the outer peripheral edge of the movable ring plate 48 in the vicinity of the suction chamber 74, and in particular, lubricating oil that tends to stay at the bottom of the suction chamber 74 is movable scroll. Stirring is accompanied by 32 turns. That is, the lubricating oil in the suction chamber 74 is positively stirred, and this lubricating oil is forcibly supplied to the needle bearings 18 and 44, the ball coupling 46 and the compression chamber 36. As a result, the durability of the compressor can be improved.

The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the rib 96 is disposed along the outer peripheral edge of the movable ring plate 48. However, as shown in FIG. 3, the rib 96 is inclined with respect to the outer peripheral edge of the movable ring plate 48A. May be. Specifically, the rib (stirring member) 96A in the figure is disposed outside the race groove 51A, and is disposed at a predetermined angle that promotes the stirring of the lubricating oil with respect to the turning in the arrow direction. As a result, the lubricating oil in the suction chamber 74 is more actively stirred. The number of ribs described above is not limited to three, and may be one as long as the lubricating oil can be stirred.

  Moreover, although the example embodied in the vehicle air conditioner was shown in the said embodiment, the fluid machine of this invention is applicable to the whole air_conditioning | cooling / refrigeration system.

It is the longitudinal section showing the scroll type compressor concerning one embodiment of the present invention. (A) is a front view of the movable side plate of FIG. 1, (b) is a BB arrow directional cross-sectional view. It is a front view of the movable side plate in another Example.

Explanation of symbols

2 Scroll type compressor (scroll type fluid machine)
4 Housing 6 Front Housing 8 Rear Housing 12 Rotating Shaft 18, 20 Bearing 30 Scroll Unit 32 Movable Scroll 34 Fixed Scroll 46 Ball Coupling (Rotation Prevention Mechanism)
48 Movable side ring plate (movable side plate)
58 Fixed ring plate (fixed plate)
65 balls (spherical member)
68 Discharge chamber 74 Suction chamber 76 Discharge port 78 Lubricating oil separator 80 Separation chamber 86 Oil storage chamber 90 Return path (communication path)
96, 96A Rib (stirring member)

Claims (2)

A housing comprising a front housing and a rear housing connected to the front housing and having a suction chamber for working fluid containing lubricating oil, a discharge chamber connected to the suction chamber, and a discharge port connected to the discharge chamber;
A rotating shaft extending through the front housing and rotatably supported by the front housing via a bearing;
A scroll unit housed in the rear housing and driven by the rotating shaft to perform a series of processes of suction, compression and discharge of working fluid;
A separation chamber housed in the rear housing and positioned between the discharge chamber and the discharge port; and an oil storage chamber for storing the separated lubricating oil positioned below the separation chamber; And a lubricating oil separation device for separating the lubricating oil from the working fluid.
The scroll unit is driven by the rotating shaft and revolves around the axis of the fixed scroll. The scroll unit is provided in the fixed scroll and feeds lubricating oil in the oil storage chamber to the suction chamber. A passage and a rotation prevention mechanism for preventing the rotation of the movable scroll without hindering the revolving orbiting motion of the movable scroll,
The rotation prevention mechanism includes a fixed side plate supported by the front housing, and a stirring member supported on the back side of the movable scroll and stirring the lubricating oil from the oil storage chamber at an outer peripheral portion near the suction chamber. A scroll type fluid machine, comprising: a movable side plate having a spherical member sandwiched between the plates.   2. The scroll type fluid machine according to claim 1, wherein the stirring member is disposed at a predetermined angle that promotes stirring of the lubricating oil with respect to an outer peripheral edge of the movable side plate.

Images