JP2012067712A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor that has a back-pressure mechanism for pressing a back-pressure partition band to the back surface of a turning end plate right after starting, and requires no sprig member in a back-pressure partition mechanism.SOLUTION: The bottom of a back-pressure partition band storing groove and the inner side of a bearing are communicated with each other. The communication allows oil supplied to the inner side of a bearing right after starting to be supplied to the bottom surface of the back-pressure partition band through the communication path by centrifugal force. The back-pressure partition band therefore can float up, by oil pressure even without a spring member, from the back-pressure partition band storing groove and is pressed to the back surface of the turning end plate.

Description

  TECHNICAL FIELD The present invention relates to a scroll compressor used in a refrigeration air conditioner for business use, household use, or vehicle use, or a heat pump type hot water supply system.

  A conventional back pressure partition mechanism of a scroll compressor will be described with reference to the drawings.

  FIG. 5 is a longitudinal sectional view of a compression mechanism of a conventional scroll compressor, and FIG. 6 is a sectional view of the vicinity of a back pressure partition mechanism of the conventional scroll compressor.

  In order to relieve the axial thrust force applied from the compression work space 103 to the swivel mirror plate 102 shown in FIG. 5, the discharge pressure of the compression mechanism acts on the center side of the back surface of the swivel mirror plate 102, and the discharge pressure on the outside thereof. The minute gap 107 between the swivel mirror plate 102 and the axial support portion 106 of the bearing member 105 shown in FIG. 6 is slidable with the back surface of the swivel mirror plate 102 so that a pressure intermediate between the low discharge pressure and the suction pressure acts. It is partitioned by a back pressure partition 108 that contacts the surface.

  In the back pressure partition 108, a lubricating oil having a pressure equal to the discharge pressure of the compressor groove 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 pressure divider storage groove 109, it is pressed against the back surface of the swivel end plate 102.

  In addition, a spring member 114 is provided between the back pressure partition band 108 and the back pressure partition storage groove 109 in order to prevent the back pressure partition band 108 from being lifted from the back pressure partition storage groove 109 immediately after starting. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 3-149382

  In the prior art, a spring member has to be provided in order to bring the back pressure partition band into contact with the back surface of the swivel end plate immediately after starting, and there are problems such as an increase in cost and complication of assembly.

  SUMMARY OF THE INVENTION Accordingly, the present invention has been made to improve the above-described conventional problems, and an object of the present invention is to provide a scroll compressor in which a back pressure partition band can come into contact with the back surface of a swivel end plate immediately after starting without using a spring member. .

  In order to solve the above-mentioned conventional problems, the scroll compressor of the present invention communicates the bottom surface of the back pressure partition band and the inside of the bearing.

  According to the present embodiment, the oil supplied to the inside of the bearing immediately after starting is supplied to the bottom surface of the back pressure partition band through the communication path by centrifugal force. Therefore, even if there is no spring member, the back pressure partition band is generated by the oil pressure. Floats up from the back pressure partition housing groove and is pressed against the back of the swivel panel.

By employing the bottom surface of the back pressure partition band and the communication path inside the bearing of the present invention, a scroll compressor excluding the spring member can be provided.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention Cross-sectional view of compression mechanism section in Embodiment 1 of the present invention Cross-sectional view of the vicinity of the back pressure partition band in Embodiment 1 of the present invention Cross-sectional view of the vicinity of the back pressure partition band in Embodiment 2 of the present invention Sectional view of the compression mechanism of a conventional scroll compressor The figure which shows the cross section near the back pressure partition of the conventional scroll compressor

  According to a first aspect of the present invention, there is provided a compression mechanism in a sealed container, an electric motor for driving the compression mechanism provided below the compression mechanism, a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism, and a sealed An oil supply mechanism is provided that supplies oil in an oil reservoir provided in a lower portion in the container to a bearing portion of the crankshaft and a sliding movement portion of the compression mechanism through the crankshaft.

  The compression mechanism includes a fixed scroll formed on a fixed frame, a turning scroll disposed so as to mesh with the fixed scroll to form a plurality of compression spaces, and a rotation prevention mechanism for preventing the rotation of the turning scroll. It consists of.

  The peripheral plane of the fixed frame and the peripheral plane of the orbiting scroll's orbiting end plate are slidably contacted, and an axial support is provided on the rear surface of the orbiting end plate via a minute gap. A back pressure partition band having a rectangular cross section is provided to slidably seal and partition the minute gap so that two types of combined pressure in the radial direction and the axial direction can act, and this can be used as a bearing member or swivel. A back pressure partition band housing groove formed in the end plate is housed, and a passage is provided to communicate the bottom surface of the back pressure partition band housing groove with the inside of the bearing.

  As a result, the oil supplied to the inside of the bearing immediately after start-up is supplied to the bottom of the back pressure partition band by the centrifugal force without the need for a spring member, which has been required in the past. The partition band floats up from the back pressure partition band housing groove, and the back pressure partition band can be pressed against the revolving end plate.

  The second invention is provided with a plurality of communication passages in the first invention. By arranging the communication passages at equal intervals and according to the compression pressure, the back pressure partition band can be evenly and smoothly. It can be pressed against the swivel end plate.

  In the third invention, in particular, by providing an annular groove along the back pressure partition housing groove on the bottom surface of the back pressure partition housing groove of the first or second invention, the oil discharged from the communication passage is Since the back pressure partition band is evenly contacted, the back pressure partition band can be pressed evenly and smoothly onto the revolving end plate.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this Example.

(Embodiment 1)
FIG. 1 is an example of a cross-sectional view of a scroll compressor according to Embodiment 1 of the present invention. FIG. 2 is an example of a cross-sectional view of the compression mechanism according to Embodiment 1 of the present invention. FIG. 3 shows the vicinity of the back pressure partition band of the scroll compressor according to the first embodiment of the present invention.

  A stator 3a of an electric motor that drives the compression mechanism 2 is shrink-fitted and fixed inside the sealed container 1, and a crankshaft 4 that drives the compression mechanism 2 is coupled to the rotor 3b of the electric motor.

  The compression mechanism 2 engages with the fixed scroll 117 to form a plurality of compression working spaces 103, and the orbiting scroll 101 having the orbiting scroll blades 118 formed on the orbiting end plate 102. The turning drive shaft 120 provided on the opposite side of the turning scroll blade 118 of the turning end plate 102 is provided inside the main shaft 121 formed at one end of the crankshaft 4. The crankshaft 4 is fitted in an eccentric bearing 122 and is supported by a bearing member 105 having a main bearing 123 that supports the main shaft 121.

  Further, 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 2 acts on the center side of the back surface of the swivel mirror plate 102, and the back of the swivel mirror plate 102. The pressure chamber 110 is provided with a back pressure partition band 108 having a rectangular ring shape that partitions the 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 in the present embodiment, FIG. 3 shows a back pressure partition band 108 neighborhood view of FIG. The back pressure partition 108 is housed in a ring-shaped back pressure partition housing groove 109 formed in the bearing member 105, and is provided with a communication path 111 that connects the bearing inner space 113 and the bottom surface of the back pressure partition housing housing groove.

  Next, the operation of the present invention will be described. The refrigerant sucked from the suction port 124 of the compression mechanism 2 is sequentially compressed in the compression work space 103 and discharged from the discharge port 125. The compression principle of the scroll compressor is already known and will not be described.

  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 lubricating oil that lubricates the compression mechanism 2 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, the back portion of the back pressure partition storage groove 109 formed in the bearing member 105 that stores the back pressure partition band 108 by the lubricating oil having a pressure acting on the center of the back surface of the swivel end plate 102 immediately after the start or depending on operating conditions or the like. 3, even if the back pressure partition 108 is difficult to move in the direction in which it is pressed against the swivel end plate 102, the bearing inner space 113 and the back pressure partition storage groove 109 are connected to the communication path as shown in FIG. 3. The oil obtained by centrifugal force due to the rotation of the crankshaft 4 immediately after starting by reaching the back pressure partition band housing groove 109 through the communication path 111 and pressing the back pressure partition band 108 against the swivel end plate 102.

  As a result, the inside and outside of the back pressure partition 108 are stably slidably sealed, and the lubricant close to the discharge pressure flows excessively into the back pressure chamber lower than the discharge pressure, so that the plane of the swivel end plate 102 slides. As a result, the power loss due to the increase in the efficiency of the compressor or the like, and the reduction in the efficiency of the compressor or the decrease in the reliability due to the decrease in the lubricating oil are eliminated.

(Embodiment 2)
FIG. 4 shows the vicinity of the back pressure partition band of the scroll compressor according to Embodiment 2 of the present invention.

  The lower oil groove 112 is provided in the ring-shaped back pressure partition housing groove on the bottom surface of the back pressure partition housing groove 109 of the first embodiment, so that the oil that has passed through the communication path 111 is located below the back pressure partition housing groove. It flows in along the oil groove 112, and the back pressure partition 108 can be uniformly pressed against the revolving end plate 102.

  As described above, the scroll compressor according to the present invention can reduce the cost by excluding the spring member from the configuration, improve the assemblability and the long-term reliability, and can be used for the HFC refrigerant, the HCFC refrigerant, and the natural refrigerant. Since it can be applied to applications such as a compressor for air conditioning using a certain carbon dioxide and a compressor for a heat pump type hot water heater, practical use can be expected from the viewpoint of energy saving.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3a Stator 3b Rotor 4 Crankshaft 101 Orbiting scroll 102 Orbiting end plate 103 Compression work space 105 Bearing member 106 Axial support part 107 Small space | gap 108 Back pressure partition band 109 Back pressure partition band accommodation groove 110 Back Pressure chamber 111 Communication path 112 Lower oil groove 113 Bearing inner space 114 Spring member 116 Fixed frame 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 (3)

A compression mechanism in the sealed container, an electric motor, a crankshaft that transmits the rotational force of the motor to the compression mechanism, and oil in the bottom portion of the sealed container through the oil supply hole that penetrates the crankshaft, An oil supply mechanism that supplies the mechanism sliding portion, and the compression mechanism includes a fixed scroll, a revolving scroll that meshes with the fixed scroll to form a plurality of compression spaces, and a rotation that prevents the revolving of the revolving scroll. A cross-section that is provided with an axial support portion on the back of the end plate of the orbiting scroll through a minute gap, and that slidably seals the minute gap to divide it into an inner high-pressure space and an outer intermediate-pressure space A rectangular ring-shaped back pressure partition band is provided, the back pressure partition band is stored in a back pressure partition band storage groove formed on a bearing member or a swivel end plate, and communicates with the bottom surface of the back pressure partition band storage groove and the high pressure space. axis Scroll compressor provided with a communication passage for communicating the interior space. The scroll compressor according to claim 1, comprising a plurality of the communication passages. The scroll compressor according to claim 1 or 2, wherein a lower oil groove along the back pressure partition housing groove is provided on the bottom surface of the back pressure partition housing groove.