JP2007023956A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficiency-stable and highly reliable scroll compressor by operating so that a back pressure partition belt is quickly pressed to a turning end plate back face in a stable state just after starting. <P>SOLUTION: Lubricating oil of pressure equal to delivery pressure of a compression mechanism acting on the central side of a back face of a turning end plate, is made to act between abutting surfaces of an inner diameter side surface and a storage part bottom surface of the back pressure partition belt by storing the back pressure partition belt in a cylindrical storage part. The back pressure partition belt quickly floats from the storage part just after starting, and is pressed to the back face and a storage part outer peripheral side surface of the turning end plate, and sealing is secured, and back pressure is stabilized, and the highly reliable and efficiency stable scroll compressor can be provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor used in a commercial and home air conditioner (air conditioner) or the like.

  An example of a conventional scroll compressor will be described below with reference to the drawings.

  FIG. 3 is a longitudinal sectional view showing an internal structure of a compression mechanism of a conventional scroll compressor.

In order to relieve the axial thrust force applied from the compression work space 103 to the orbiting end plate 102 of the orbiting scroll 101 shown in FIG. 3, the discharge pressure of the compression mechanism 104 acts on the center side of the rear surface of the orbiting end plate 102, A minute gap 107 between the swivel mirror plate 102 and the axial support portion 106 of the bearing member 105 is formed on the back surface of the swivel mirror plate 102 so that a pressure intermediate between the discharge pressure and the suction pressure acts on the outside thereof. It partitions with the back pressure partition 108 which contact | connects slidably (FIG. 4). In the back pressure partition 108, lubricating oil having a pressure equal to the discharge pressure of the compressor groove 104 acting on the center side of the back surface of the swivel end plate 102 is formed on the bearing member 105 that houses the back pressure partition 108. By flowing into the back pressure partition band housing groove 109, it is pressed against the back surface of the swivel end plate 102 and the outer peripheral side surface of the housing groove 109. (For example, see Patent Document 1)
Japanese Patent Laid-Open No. 1-178785 (page 4, FIG. 3)

  However, the conventional back pressure partition 108 may remain in the back pressure partition storage groove 109 immediately after starting, and high-pressure lubricating oil flows into the back of the back pressure partition 108. Therefore, the back pressure partition 108 is not pressed against the back surface of the swivel end plate 102, and the lubricating oil close to the discharge pressure flows excessively into the back pressure chamber 110 lower than the discharge pressure. Further, there is a problem that power loss due to sliding of the swivel end plate 102 is increased, thereby reducing the efficiency of the compressor and lowering the reliability.

  The present invention solves these problems, and immediately after the start, the back pressure partition band 108 is operated in such a manner that it is pressed against the back surface of the swivel end plate 102 and the outer peripheral side surface of the storage groove 109. Accordingly, an object of the present invention is to provide a scroll compressor with high efficiency and high reliability.

  In order to solve the above-described conventional problems, the present invention provides an axial support portion on the back of a scroll compressor through a minute gap, and two types of combined pressures in the radial direction and the axial direction are provided on the swivel end plate. In order to act, a ring-shaped back pressure partition band that slidably seals and partitions the minute gap is provided, and this is stored in a back pressure partition band storage portion formed on the bearing member or the swivel end plate, Pressure is applied directly to the contact surface between the inner peripheral side surface of the back pressure partition band and the bottom surface of the storage unit.

  With this configuration, the back pressure partition band is a bottom surface of the storage section formed by the lubricating oil having a pressure equal to the discharge pressure of the compression mechanism acting on the center side of the back surface of the swivel end panel on the bearing member that stores the back pressure partition band. Immediately after starting, the back pressure partition band quickly rises from the storage part and is pressed against the back of the swivel end plate and the outer peripheral side surface of the storage part, so that the sealing is ensured and the back pressure is stabilized. Thus, a scroll compressor having high reliability and stable efficiency can be realized.

  According to the present invention, by adopting the storage portion configuration of the back pressure partition band such that two combined pressures in the radial direction and the axial direction are likely to act on the swivel end plate and the outer peripheral side surface of the storage portion, Immediately after the compressor is started, the back pressure partition is quickly pressed against the back of the swivel end panel and the outer peripheral side of the housing, so that sealing is ensured and the back pressure is stable and the discharge pressure is stable. Lubricating oil close to the discharge pressure does not flow excessively into the low back pressure chamber, thereby stabilizing the efficiency and providing a highly reliable scroll compressor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 is an example of a cross-sectional view of a hermetic electric vertical scroll compressor according to Embodiment 1 of the present invention.

  A stator 113 of an electric motor 112 that drives the compression mechanism 104 is shrink-fitted and fixed inside the sealed container 111, and a crankshaft 115 that drives the compression mechanism 104 is coupled to the rotor 114 of the electric motor 112. The compression mechanism 104 has a revolving scroll 101 formed on a revolving end plate 102 and a revolving scroll blade 118 that meshes with a fixed scroll 116 and a fixed scroll 117 to form a plurality of compression working spaces 103, and rotates the revolving scroll 101. And a turning drive shaft 120 provided on the opposite side of the orbiting scroll blade 118 from the orbiting scroll blade 118 of the orbiting end plate 102 of the main shaft 121 formed at one end of the crankshaft 115. The crankshaft 115 is fitted into an eccentric bearing 122 provided inward, and the crankshaft 115 is supported by a bearing member 105 having a main bearing 123 that supports the main shaft 121. In addition, the back surface of the swivel mirror plate 102 is slidable with respect to the back surface, and the minute gap 107 is cut off, and the discharge pressure of the compression mechanism 104 acts on the center side of the back surface of the swivel mirror plate 102, A ring-shaped back pressure partition band 108 having a rectangular cross section is arranged to partition the back pressure chamber 110 so that an appropriate intermediate pressure between the discharge pressure and the suction pressure acts.

  Here, in order to explain the detailed configuration of the present embodiment, FIG. 2 shows an enlarged cross-sectional view of the vicinity of the back pressure partition band 108 of FIG. The back pressure partition 108 is housed in a cylindrical housing 109 </ b> A formed in the bearing member 105.

  Next, the operation of the present invention will be described. The refrigerant sucked from the suction port 124 of the compression mechanism 104 is sequentially compressed in the compression work space 103 and discharged from the discharge port 125. The compression principle of the scroll compressor is omitted because it is already known.

At this time, an axial thrust force is applied from the compression work space 103 to the orbiting end plate 102 of the orbiting scroll 101, so that the rear surface of the orbiting end plate 102 tends to be pressed against the axial support portion 106 of the bearing member 105. However, the minute gap 107 on the back surface of the swivel end plate 102 is partitioned by a back pressure partition band 108, and the center side thereof is filled with a lubricating oil that lubricates the compression mechanism 104 having the same pressure as the discharge pressure. Since an appropriate intermediate pressure between the discharge pressure and the suction pressure acts on the outside, the axial thrust force applied from the compression work space 103 side is offset with the pressure inside the back pressure partition 108, The contact force with the fixed frame body 116 can be reduced to reduce sliding loss. Further, conventionally, the lubricating oil having a pressure acting on the center of the back surface of the swivel end plate 102 is difficult to flow into the back surface of the storage groove formed in the bearing member 105 that stores the back pressure partition band 108 immediately after starting or due to operating conditions. Even if it is difficult to operate in the direction in which the back pressure partition 108 is pressed against the swivel end plate 102 (that is, the direction of rising from the groove), according to the shape of the storage portion 109A in this embodiment, as shown in FIG. Since the high pressure lubricating oil is directly filled between the inner peripheral side surface of the back pressure partition band 108 and the contact surface of the storage portion 109A, the swivel end plate 10 is promptly provided after the compressor is started.
2 is pressed against the back surface 122 and the outer peripheral side surface of the storage portion 109A, thereby stably sealing the inside and outside of the back pressure partition 108 so that the back pressure chamber is lower than the discharge pressure and close to the discharge pressure. That the lubricating oil flows in excessively, the power loss due to the sliding of the plane of the revolving end plate 102 increases, and the efficiency of the compressor is lowered, or the lubricating oil is reduced and the reliability is lowered. Disappears.

  In the present embodiment, the case where the storage portion 109A of the back pressure partition band 108 is provided in the bearing member 105 of the scroll compressor is used as a representative example, but the same applies even if the storage portion 109A is provided on the revolving end plate 105 side. Can be implemented.

  As described above, in the scroll compressor according to the present invention, the back pressure partition band is immediately pressed against the back surface of the swivel end plate and the outer peripheral side surface of the storage portion immediately after the compressor is started. In addition, the back pressure is stable and the lubricant close to the discharge pressure does not flow into the back pressure chamber lower than the discharge pressure, so that the efficiency is stabilized and a highly reliable scroll compressor is provided. Therefore, in addition to refrigeration equipment such as an air conditioner and a refrigerator, it can be applied to a heat pump hot water supply device and the like.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention FIG. 3 is an enlarged cross-sectional view of the vicinity of a back pressure partition band in Embodiment 1 of the present invention. Sectional view of the compression mechanism of a conventional scroll compressor Expanded cross-sectional view of the vicinity of the back pressure partition of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Orbiting scroll 102 Orbiting end plate 103 Compression work space 104 Compression mechanism 105 Bearing member 106 Axial support part 107 Minute gap 108 Back pressure partition band 109 Back pressure partition band accommodation groove (conventional)
109A Back pressure partition housing part 110 Back pressure chamber 111 Sealed container 112 Electric motor 113 Stator 114 Rotor 115 Crankshaft 116 Fixed frame body 117 Fixed scroll 118 Orbiting scroll blade 119 Rotation prevention mechanism 120 Orbiting drive shaft 121 Main shaft 122 Eccentric bearing 123 Main bearing 124 Suction port 125 Discharge port

Claims (1)

A refrigeration and air conditioning compressor comprising a compression mechanism portion that performs a compression operation via a crankshaft supported by a bearing in a container, and an electric motor that drives the compression mechanism portion. In the scroll compressor comprising the orbiting scroll disposed so as to mesh with the fixed scroll to form a plurality of compression spaces, and the rotation prevention mechanism for preventing the rotation of the orbiting scroll, the fixed frame body Slidably contact the peripheral plane of the orbiting scroll and the peripheral plane of the orbiting scroll, and an axial support portion is provided on the back of the orbiting end panel via a minute gap, and the orbiting end plate is provided with a radial direction, and A ring-shaped back pressure partition band having a rectangular cross section for slidably sealing and partitioning the minute gap is provided so that two types of combined pressure in the axial direction act, and this is provided as a bearing portion. Alternatively, it is housed in a cylindrical back pressure partition housing portion formed on the swivel end plate, and pressure is applied to the side and back of the back pressure partition strip from the center direction to stretch the back pressure partition strip in the outer peripheral direction and the swivel end plate A scroll compressor characterized by performing a sealing operation.

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