JP2009121379A - Scroll compressor - Google Patents

Abstract

A high-efficiency, high-reliability, low-cost scroll compressor in which a back pressure partition band is stably sealed and slid on a swivel end plate, and is equalized over the entire sliding contact surface. To provide.
A ring member with a cut-and-raised portion is installed in an annular groove of a bearing member together with a back pressure partition band so that the back pressure partition band is stably slid and sealed by a spring effect of the cut and raised portion. In addition, since the back pressure partition band 14 is supported via the flat portion 21, the force pressed against the swivel end plate can be equalized, and the promotion of partial wear of the back pressure partition band 14 can be suppressed. Can do.
[Selection] Figure 3

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 its structure and principle are widely known. Hereinafter, the scroll compressor shown in FIGS. 4 to 6 will be described as an example with reference to the drawings (for example, see Patent Document 1).

  The compression mechanism 1 includes a fixed scroll 2, a turning scroll 4 disposed so as to mesh with the fixed scroll 2 to form a plurality of compression spaces 3, and an Oldham ring 6 that prevents the turning of the turning scroll 4. And a crankshaft 7 that drives the orbiting scroll 4 and a bearing member 8 that supports the crankshaft 7.

  An annular groove 10 is provided in the axial support portion 9 of the bearing member 8, and a spring member 12, a ring member 13, and a back pressure partition band 14 are installed in the annular groove 10. The back pressure partition band 14 is slidably in contact with the orbiting end plate 5 of the orbiting scroll 4 facing the axial support portion 9 through the minute gap 11.

  In addition, the swivel end plate 5 is provided with a diaphragm mechanism 15, and the lubricating oil in a high pressure atmosphere is reduced to an appropriate pressure between high pressure and low pressure and introduced into the intermediate pressure chamber 16.

  With the above configuration, when the rotational force of the electric motor unit (not shown) is transmitted via the crankshaft 7, the low-pressure fluid sucked from the suction port 17 of the compression mechanism 1 is sequentially supplied to the plurality of compression spaces 3. Compressed and discharged from the discharge port 18 as a high pressure fluid.

  Due to the operation of the compression mechanism 1, the pressure in the plurality of compression spaces 3 rises, and a separating force that causes the orbiting end plate 5 of the orbiting scroll 4 to move away from the fixed scroll 2 acts. On the other hand, on the opposite surface of the swivel end plate 5, there are two types of pressure (hereinafter referred to as back pressure): high pressure on the inner peripheral side of the back pressure partition 14 and intermediate pressure on the outer peripheral side of the back pressure partition 14. Act.

  Thereby, the separation force is canceled out by this back pressure, and the orbiting scroll 4 is always pressed against the fixed scroll 2 with an appropriate force, suppressing leakage loss in the compression space 3 and reducing sliding loss. High efficiency is achieved.

  The operation of the back pressure divider 14 is likely to become unstable especially immediately after starting or due to operating conditions. For this reason, a spring member 12 is installed between the back pressure partition band 14 and the annular groove 10 so that the back pressure partition band 14 is always properly biased to the swivel end panel 5, and the back pressure partition band 14 is stably sealed. Sliding.

  Further, the back pressure partition band 14 is made of a relatively soft resin material such as PTFE (tetrafluoroethylene resin) in consideration of its sealing performance. Therefore, the ring member 13 is installed between the spring member 12 and the back pressure partition band 14, and the force pressed against the swivel end plate 5 is equalized over the entire sliding contact surface. It suppresses the promotion of typical wear and realizes high efficiency and high reliability.

The spring member 12 and the ring member 13 are specifically shaped and assembled as shown in FIG. 6, and those materials are, for example, SUS301-CSP, SUS304-CSP (stainless steel strip for spring), SK5, A thin plate of S60C (cold rolled steel strip for spring) is used. Further, the spring member 12 has a corrugated shape in which the thin plate is given a spring force in the axial direction by bending.
JP-A-8-61258

  However, it is desirable that the number of parts is as small as possible, especially in recent years when severe cost reduction is desired. In particular, in the above-described prior art, the above-described materials used for the spring member and the ring member have a relatively high material unit price, which has been a factor in hindering cost reduction.

  Further, when assembling the compression mechanism, it is necessary to install a spring member and a ring member, which is a cause of an increase in the number of assembly steps.

  The present invention solves such a conventional problem, and by reducing the number of parts by integrating a spring member and a ring member that urge the back pressure partition band against the swivel end plate, the cost is reduced. Furthermore, it aims at providing the scroll compressor which improved the assembly property.

  In order to solve the conventional problems, the present invention uses a ring member with a cut and raised portion provided with a cut and raised portion.

  The cut-and-raised ring member can obtain the effects of both the spring member and the ring member, reduce the number of parts and the number of assembly steps, and reduce the cost.

  According to a first aspect of the present invention, there is provided a compression mechanism having a fixed scroll, a turning scroll disposed so as to mesh with the fixed scroll to form a plurality of compression spaces, and an Oldham ring for preventing the rotation of the turning scroll. A crankshaft that drives the orbiting scroll and a bearing member that supports the crankshaft, and in order to apply two types of pressure to the orbiting end plate of the orbiting scroll, an annular groove is provided in the bearing member, A back pressure partition band is installed in this annular groove via a ring member provided with a plurality of cuts and raiseds. Thereby, while being able to obtain the effect of both a spring member and a ring member, the number of parts and an assembly man-hour can be reduced, and cost can be reduced.

  In the second invention, in particular, in the first invention, the plurality of cut and raised directions provided on the ring member are paired with each other. Thereby, in addition to the effects in the first invention, the forces acting in the circumferential direction out of the spring force by the cut-and-raised portion cancel each other, so that the circumferential stability of the ring member is improved, and the back pressure The operation of the divider can be further stabilized.

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

  Further, the same reference numerals are used for the same components as those of the conventional example described in FIGS. 4 to 6, and the description of the operation is omitted.

(Embodiment 1)
FIG. 1 is a perspective view of a ring member with a cut and raised portion used in the scroll compressor according to the first embodiment of the present invention. FIG. 2 is a perspective view of the scroll compressor according to the first embodiment of the present invention. It is a perspective view which shows the assembly | attachment state of a ring member with a cut and raised and a back pressure partition band.

  In FIG. 1, the ring member 19 with cut and raised has a plurality of cut and raised portions 20 and a flat portion 21. 2, the cut-and-raised portion 20 of the ring member 19 with a cut-and-raised portion is formed in the annular groove 10 provided in the axial support portion 9 of the bearing member 8 and the plan view 21 is the back. It is installed so as to be on the pressure partition 14 side, and a back pressure partition 14 is further installed.

  In order to obtain the spring force of the cut-and-raised portion 20, the ring member 19 with the cut-and-raised portion uses, for example, a stainless steel strip for springs or a thin plate of a cold-rolled steel strip for springs.

  The operation of the back pressure partition band 14 is likely to be unstable, particularly immediately after starting or due to operating conditions, but the back pressure partition band 14 is stably sealed with the revolving end plate 5 by the spring force of the cut and raised portion 20. Can be moved.

  Further, even if the back pressure partition band 14 is a resin material that is relatively soft due to its sealing property or the like, the back pressure partition band 14 is supported via the flat portion 21 and is therefore pressed against the swivel end plate 5. The force can be equalized over the entire sliding contact surface, and the promotion of partial wear of the back pressure partition 14 can be suppressed.

  As a result, it is possible to obtain a scroll compressor with high efficiency and high reliability in which the number of parts is reduced as compared with the prior art and the cost is reduced and the assemblability is improved.

(Embodiment 2)
FIG. 3 is a perspective view of a ring member with a cut-and-raised part used in the scroll compressor according to the second embodiment of the present invention.

  In FIG. 3, the plurality of cut-and-raised portions 20 of the ring member 19 with cut-and-raised are made to be paired with each other on the same surface side.

  Thereby, similarly to the operation and effect in the first embodiment, the back pressure partition band 14 is stably sealed and slid on the swivel end panel 5, and the promotion of partial wear of the back pressure partition band 14 is suppressed. Since the force acting in the circumferential direction out of the spring force generated by the cut-and-raised portion cancels each other, the circumferential stability of the ring member is improved and the operation of the back pressure partition band can be further stabilized. it can.

  Further, in the above embodiment, an annular groove is provided in the axial support portion of the bearing member, and a ring member with a cut-and-raised portion and a back pressure partition band are installed in the annular groove. It is good also as a structure which provides an annular groove in the turning mirror board which faces a direction support part, and installs a ring member and a back pressure partition band with a cut and raised in this annular groove.

  Moreover, in the said embodiment, the material of the ring member with a cut and raised was demonstrated in the case where the stainless steel strip for springs, the thin plate of the cold-rolled steel strip for springs, and the back pressure partition strip are resin-based materials However, it is not limited to these.

  As described above, the scroll compressor according to the present invention can realize high efficiency, high reliability, and low cost, and can be widely applied not only to the scroll compressor but also to a configuration in which two types of pressure are applied. .

The perspective view of the ring member with a cut and raised used for the scroll compressor in Embodiment 1 of this invention The perspective view which shows the assembly | attachment state of the ring member with a cut-and-raised part and back pressure partition band of the scroll compressor in the 1st Embodiment of this invention. The perspective view of the ring member with a cut and raised used for the scroll compressor in Embodiment 2 of this invention Sectional view of the main part of a conventional scroll compressor Sectional view of the main part of the back pressure divider in a conventional scroll compressor The perspective view which shows the assembly | attachment state of the spring member in a conventional scroll compressor, a ring member, and a back pressure partition band.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compression mechanism 2 Fixed scroll 3 Compression space 4 Orbiting scroll 5 Orbiting end plate 8 Bearing member 9 Axial support part 10 Annular groove 11 Micro gap 12 Spring member 13 Ring member 14 Back pressure partition band 19 Ring member 20 with cut and raised part 21 Plane section

Claims (2)

The compression mechanism has a fixed scroll, a orbiting scroll arranged to mesh with the fixed scroll to form a plurality of compression spaces, an Oldham ring that prevents the orbiting scroll from rotating, and the orbiting scroll is driven. And a bearing member that supports the crankshaft. In order to apply two types of pressure to the orbiting end plate of the orbiting scroll, an annular groove is provided in the bearing member, and a plurality of annular grooves are provided in the annular groove. The scroll compressor which installed the back pressure partition through the ring member which provided the cut and raised part. The scroll compressor according to claim 1, wherein the plurality of cut and raised directions provided on the ring member are paired with each other.