JP2007239630A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor not causing the deterioration of reliability and performance of a compressor over long time operation even if a back pressure partition band is deformed by pressure. <P>SOLUTION: A cross section is formed in a shape having a chamfer part 19 on the outer circumference side of a surface touching the back surface 9 of a turning end plate 5 of a back pressure partition band 17. Consequently, deformation is absorbed by the chamfer part 19 even if the back pressure partition band 17 is deformed by pressure during the operation of the compressor, the back pressure partition band 17 is not pushed out of an outer circumference side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor used in an air conditioner, a heat pump type hot water heater, or the like.

  Conventionally, there is a scroll compressor as one of typical compressors, and the structure and principle thereof are widely known (for example, see Patent Document 1).

  Hereinafter, a conventional scroll compressor will be described with reference to FIGS. 5 and 6. The compression mechanism 1 includes a fixed scroll 2, a revolving scroll 6 in which a revolving spiral blade 4 that meshes with the fixed scroll 2 to form a plurality of compression spaces 3 is formed on a revolving end plate 5, and rotation of the revolving scroll 6 is prevented. The Oldham ring 7 that makes only the orbiting motion, the crankshaft 8 that drives the orbiting scroll 6, the crankshaft 8 is rotatably supported, and faces the back surface 9 of the orbiting mirror plate 5 opposite to the orbiting spiral blade 4. And a bearing member 12 provided with an axial support portion 11.

  Further, a minute gap 10 is provided between the back surface 9 and the axial support portion 11 so that the orbiting scroll 6 can be swiveled between the fixed scroll 2 and the bearing member 12 and compressed. When the pressure in the space 3 rises abnormally, the orbiting scroll 6 moves in the axial direction, so that a gap is formed between the orbiting scroll 6 and the fixed scroll 2 to release the pressure.

  When the rotational force of the electric motor unit (not shown) is transmitted through the crankshaft 8, the fluid sucked from the suction port 14 of the compression mechanism 1 is sequentially compressed in the plurality of compression spaces 3, and the discharge port 15 It is discharged from. At this time, the orbiting end plate 5 of the orbiting scroll 6 is subjected to a force to leave the fixed scroll 2 due to the pressure acting from the compression space 3.

  On the other hand, the axial support portion 11 is provided with an annular groove 16 in which a spring member 13, a washer 18 for equalizing the pressing force of the spring member, and a back pressure partition band 17 are installed. Yes. An intermediate pressure Pm that is higher than the suction pressure and lower than the discharge pressure acts on the outer peripheral side of the back pressure partition band 17, and the discharge pressure Pd acts on the inner peripheral side of the back pressure partition band 17. Thereby, these two types of pressures partitioned by the back pressure partition band 17 act on the back surface of the orbiting end plate 5, so that the orbiting scroll 6 acts to press against the fixed scroll 2.

With the above configuration, the axial force acting on the orbiting end plate 5 is moderately offset, the orbiting scroll 6 is brought into contact with the fixed scroll 2 with an appropriate force, and the sealing property of the compression space 3 is ensured and the sliding loss is reduced. It is made smaller and more efficient.
JP-A-8-61258

  However, in the above prior art, the back pressure partition band 17 is generally made of a relatively soft resin material such as PTFE in consideration of its sealing performance.

Therefore, during operation of the compressor, as shown in FIG. 7, a higher pressure acts on the inner peripheral side than the outer peripheral side of the back pressure partition band 17 (Pd> Pm), so that the back pressure partition band 17 becomes an annular groove. Although it protrudes to the outer peripheral side of 16, since the minute gap 10 is provided, it is deformed so as to be pushed into the minute gap 10.

  In particular, the working fluid is used in an alternative refrigerant R410A that does not contain chlorine and is used in recent years for heat pump water heaters, etc., compared to R22, which is a refrigerant that has been widely used in air-conditioning equipment. With the carbon dioxide refrigerant that is being produced, its operating pressure becomes very high and the deformation of the back pressure partition becomes larger.

  If the operation is continued for a long time in such a state, the sealing performance is lowered due to the deformation of the back pressure partition band 17 or the extruded portion is torn off to become a foreign object, and the compressor and the compressor are connected. There was a possibility of remaining and depositing during the cycle, leading to deterioration in performance and reliability.

  The present invention solves such a conventional problem, and even if the back pressure partition is deformed by pressure, the scroll does not cause deterioration in the performance and reliability of the compressor over a long period of operation. An object is to provide a compressor.

  In order to solve the above-described conventional problems, the present invention has a cross-sectional shape in which a chamfered portion is provided on the outer peripheral side of the surface of the back pressure partition band that contacts the back surface of the swivel end plate.

  Even if the back pressure partition band is deformed by pressure due to the chamfered portion of the back pressure partition band, the deformation is absorbed by the chamfered portion, so that it is possible to suppress the extrusion to the outer peripheral side of the minute gap.

  The first invention is a revolving scroll in which a revolving scroll blade is formed on a revolving end plate that has a compression mechanism and a revolving scroll blade that meshes with the fixed scroll to form a plurality of compression spaces, and prevents the revolving of the revolving scroll. An Oldham ring for driving, a crankshaft for driving the orbiting scroll, a main bearing for supporting the crankshaft, and a back surface of the orbiting mirror plate on the side opposite to the orbiting spiral blades, facing each other through a minute gap. A bearing member provided with an axial support portion and a back pressure partition band that slidably partitions pressure on the back surface of the revolving end plate so as to act on two kinds of pressure are provided, and an outer peripheral side of the back pressure partition band A higher pressure is applied to the inner peripheral side, and the back pressure partition band has a cross-sectional shape in which a chamfered portion is provided on the outer peripheral side of the surface in contact with the back surface of the swivel end plate. Thereby, even if the back pressure partition band is deformed by pressure, since the deformation is absorbed by the chamfered portion, it is possible to suppress the extrusion to the outer peripheral side of the minute gap.

  In the second invention, in particular, in the first invention, a cross-sectional shape is provided in which a rounded portion is provided on the outer peripheral side of the surface in contact with the back surface of the swivel mirror plate. As a result, as with the effect of the first invention, even if the back pressure partition band is deformed by the pressure acting on it, the deformation is absorbed by the rounded portion, so that it is possible to suppress the extrusion to the outer peripheral side of the minute gap. it can.

  According to a third invention, in the first invention, the axial height of the chamfered portion is made larger than that of the minute gap. Thereby, in addition to the effect by 1st invention, since the outer peripheral side edge part of an annular groove can weaken the contact to a back pressure partition band, it can suppress further pushing out to the outer peripheral side of a micro clearance gap. it can.

According to a fourth aspect, in the second aspect, the radius in the axial direction of the rounded portion is larger than that of the minute gap. Thereby, in addition to the effect by 2nd invention, since the outer peripheral side edge part of an annular groove can weaken the contact to a back pressure partition belt, it can suppress further pushing out to the outer peripheral side of a micro clearance gap. it can.

  According to a fifth invention, in any one of the first to fourth inventions, the working fluid of the compressor is carbon dioxide or a high pressure gas such as R410A, and the operating pressure becomes very high. Even if the deformation of the back pressure partition band is further increased, the deformation is absorbed by the chamfered portion, so that it is possible to suppress the extrusion to the outer peripheral side of the minute gap.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

The same reference numerals are used for the same components as those in the conventional example described in FIGS. 5 to 7, and the description of the operation is omitted.
(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of a scroll compressor according to a first embodiment of the present invention.

  In FIG. 1, an annular groove 16 is provided in the axial support portion 11 of the bearing member 12, and a spring member 13, a washer 18 for equalizing the pressing force of the spring member, and a back pressure partition band. 17 are installed. Further, it is installed so that the back surface 9 of the swivel end plate 5 faces through the axial support portion 11 and the minute gap 10. Further, the back pressure partition band 17 has a cross-sectional shape in which a chamfered portion 19 is provided on the outer peripheral side of the surface in contact with the turning back surface 9.

  When the compressor is operated, an intermediate pressure Pm that is higher than the suction pressure and lower than the discharge pressure is applied to the outer peripheral side of the back pressure partition band 17, and the discharge is applied to the inner peripheral side of the back pressure partition band 17. Pressure Pd acts.

  The back pressure partition band 17 is made of a relatively soft resin material mainly made of PTFE in consideration of its sealing performance, and the back pressure partition band 17 projects to the outer peripheral side of the annular groove 16. At this time, since the minute gap 10 is provided, an attempt is made to deform so as to be pushed out into the minute gap 10, but since the chamfered portion 19 is provided, the deformation is absorbed by the chamfered portion 19. It is possible to prevent the minute gap 10 from being pushed out to the outer peripheral side.

Therefore, the sealing performance of the back pressure partition band is not lowered or the extruded part is not torn off, and there is a concern that the performance and reliability may be lowered even in the long-term operation of the compressor. Absent.
(Embodiment 2)
FIG. 2 is a cross-sectional view of a main part of the scroll compressor according to the second embodiment of the present invention.

In FIG. 2, the back pressure partition band 17 has a cross-sectional shape in which a rounded portion 20 is provided on the outer peripheral side of the surface in contact with the swivel end plate 9. Thereby, since the deformation | transformation of the back pressure partition band 17 by a pressure can be absorbed by the round part 20 similarly to the effect | action and effect in Embodiment 1, it can suppress pushing out to the outer peripheral side of the micro clearance gap 10. FIG. .
(Embodiment 3)
FIG. 3 is a cross-sectional view of a main part of a scroll compressor according to the third embodiment of the present invention.

In FIG. 3, in addition to the first embodiment, the axial height b of the chamfered portion 19 is made larger than the axial dimension a of the minute gap 10. As a result, in addition to the effects of the first invention, it is possible to further suppress the extrusion to the outer peripheral side of the minute gap 10, and even when the back pressure partition band 17 is about to be pushed to the outer peripheral side of the minute gap 10. The contact with the outer peripheral side edge portion 21 of the annular groove 16 can be weakened, and even if the back pressure partition band 17 is pushed out, the possibility of tearing can be further suppressed. .
(Embodiment 4)
FIG. 4 is a cross-sectional view of a main part of a scroll compressor according to the fourth embodiment of the present invention.

  In FIG. 4, in addition to the second embodiment, the radius b of the radius portion 20 is made larger than the axial dimension a of the minute gap 10. As a result, in addition to the effects of the second invention, it is possible to further suppress the extrusion to the outer peripheral side of the minute gap 10, and even when the back pressure partition band 17 is about to be pushed to the outer peripheral side of the minute gap 10. The contact with the outer peripheral side edge portion 21 of the annular groove 16 can be weakened, and even if the back pressure partition band 17 is pushed out, the possibility of tearing can be further suppressed. .

  In the first to fourth embodiments, the cross-sectional shape in which the chamfered portion or the rounded portion is provided in the back pressure partition band has been described. However, if the shape conforms to this, the same operation and effect can be obtained. it can.

  In the first to fourth embodiments described above, the annular groove in which the back pressure partition band, the washer, and the spring member are installed is described as being provided in the axial support portion of the bearing member. It is good also as a structure which provides an annular groove in the turning mirror board which faces a part, and installs a back pressure partition band, a washer, and a spring member.

  In the first to fourth embodiments, the main material of the back pressure partition band is PTFE (tetrafluoroethylene resin). However, it may be a relatively soft material such as a resin.

  As described above, the scroll compressor according to the present invention does not cause deterioration in the performance or reliability of the compressor over a long period of operation even if the back pressure partition is deformed by pressure. The present invention can also be applied when the working fluid is R410A or a high-pressure fluid other than carbon dioxide.

Sectional drawing of the principal part of the scroll compressor in Embodiment 1 of this invention Sectional drawing of the principal part of the scroll compressor in Embodiment 2 of this invention Sectional drawing of the principal part of the scroll compressor in Embodiment 3 of this invention Sectional drawing of the principal part of the scroll compressor in Embodiment 4 of this invention Sectional view around the compression mechanism of a conventional scroll compressor Sectional drawing of the principal part of the scroll compressor in the conventional scroll compressor Cross-sectional view of the main part showing the deformation of the back pressure divider in a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Revolving end plate 9 Back surface 10 Minute clearance 11 Axial support part 12 Bearing member 13 Spring member 16 Annular groove 17 Back pressure partition band 18 Washer 19 Chamfered part 20 Round part 21 Annular groove outer peripheral edge part

Claims (5)

A revolving scroll in which a revolving scroll blade is formed on a revolving end plate, and an Oldham ring for preventing rotation of the revolving scroll; A crankshaft for driving the orbiting scroll, a main bearing for supporting the crankshaft, and an axial support portion facing the back surface of the orbiting mirror plate on the side opposite to the orbiting spiral blade through a minute gap. And a back pressure partition band that slidably divides the pressure so that two types of pressure are applied to the back surface of the swivel end panel, and is higher on the inner peripheral side than the outer peripheral side of the back pressure partition band A scroll compressor in which a pressure is applied and the back pressure partition band has a cross-sectional shape in which a chamfered portion is provided on an outer peripheral side of a surface in contact with a back surface of the revolving end plate. The scroll compressor according to claim 1, wherein the back pressure partition band has a cross-sectional shape in which a rounded portion is provided on an outer peripheral side of a surface in contact with the back surface of the swivel end plate. The scroll compressor according to claim 1, wherein the height of the chamfered portion in the axial direction is larger than that of the minute gap. The scroll compressor according to claim 2, wherein the radius of the radius portion is larger than that of the minute gap. The scroll compressor according to any one of claims 1 to 4, wherein the working fluid of the compressor is carbon dioxide or a high-pressure gas such as R410A.

Images