JP2011085083A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that change of oil supply quantity is large according to pressure difference under operation conditions since always pressure difference exists, excessive oil is supplied and performance may get instable if pressure difference is large, and that productivity drops because the number of components increases in a former structure causing increase of material cost and increase of assembly man-hours, although there is a method for improving lubricity of a vane sliding surface by introducing oil in a high pressure atmosphere to a suction hole in a low pressure atmosphere by using pressure difference for improving a wear state of the vane sliding surface of a hermetic compressor. <P>SOLUTION: Oil 12 collected in a piston internal space 14 is supplied to a suction side of a compression mechanism through a groove 5a keeping communication with a groove 5 while lubricating the slide part of an end surface of a vane 4, with the groove 5 on the end surface of a lower bearing 1 as a flow path. Consequently an effect reliable and excellent in performance improvement is produced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used in refrigeration equipment such as an air conditioner and a refrigerator.

  Conventionally, with respect to hermetic compressors, in order to improve the wear state of the vane sliding surface, oil has been actively guided to the vane sliding surface to improve lubricity.

  FIG. 6 shows a conventional technique for improving lubricity described in Patent Document 1. The suction hole 109 and the oil reservoir 112 are connected by a filter 122, a supply pipe 126, a holder 124, and a hole 125.

Japanese Patent Application Laid-Open No. 07-063183

  However, in the conventional configuration, since the differential pressure is always applied, the oil supply amount changes greatly due to the pressure difference depending on the operating conditions. When the differential pressure is large, excessive oil is supplied and the performance becomes unstable. There was a case. Further, the conventional configuration has a problem that not only the number of parts is increased and the material cost is increased, but also man-hours for assembly are increased, so that productivity is lowered.

  The present invention solves the above-mentioned conventional problems, and controls the oil supply amount by intermittent lubrication while utilizing a pressure difference, and enables stabilization of performance while ensuring improvement in lubricity. Another object of the present invention is to provide a hermetic compressor that does not increase the number of parts and does not increase the man-hours for assembling so that the material cost is not increased and the productivity is not lowered.

  In order to solve the above-mentioned conventional problems, the hermetic compressor of the present invention is provided with a minute groove on the lower bearing end surface part in contact with the portion where the vane reciprocates, and one end of the groove communicates with the suction side. It is.

  As a result, the oil that accumulates in the space surrounded by the shaft, the inside of the piston, and the lower bearing end face has a high pressure around it, so that one end of the groove provided in the lower bearing end face portion is connected to another end that leads to the suction side that is the low pressure side. On the other hand, oil can flow due to differential pressure. At this time, since the groove is located on the vane end surface portion that performs reciprocating motion, the vane end surface portion can be lubricated. In addition, this method can prevent an increase in material costs and a decrease in productivity.

  The hermetic compressor of the present invention can improve the lubricity of the vane sliding surface and can bring about an effect of high reliability and excellent performance.

The figure of the compression mechanism part in Embodiment 1 of this invention The figure which shows the lower bearing groove shape in Embodiment 1 of this invention. The figure which shows the state at the time of the oil supply in Embodiment 1 of this invention The figure which shows the state at the time of the oil no supply in Embodiment 1 of this invention The figure which shows the lower bearing groove shape in Embodiment 2 of this invention. Configuration diagram of a conventional hermetic compressor

  In the first invention, a minute groove having a width smaller than the vane width is provided in the lower bearing end surface corresponding to the sliding surface with the portion where the vane reciprocates, and the communication from the groove to the suction side of the compression mechanism is provided. It is the structure which provided the groove | channel.

  With the above configuration, since the oil accumulated in the space surrounded by the shaft, the piston inner surface and the lower bearing end surface is at a high pressure, from one end of the groove provided in the lower bearing end surface portion to the other end leading to the suction side which is the low pressure side Therefore, the oil flows due to the differential pressure.At this time, the groove is located on the end surface of the vane where the reciprocating motion is performed. Therefore, the end surface of the vane can be lubricated, and the lubricity is improved and the reliability is high. The effect of performance improvement appears.

  In the second aspect of the invention, in particular, the flow rate can be adjusted by adopting a configuration in which the cross-sectional area of the communication groove leading to the suction side is reduced with respect to the groove shape of the first aspect of the invention. And an effect of improving the performance can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a compression mechanism portion of a hermetic compressor according to a first embodiment of the present invention.

  In FIG. 1, the refrigerant that has entered the compression chamber 8 surrounded by the upper bearing 7, the cylinder 6, the piston 3, the lower bearing 1, and the vane 2 is rotated by the rotation of the shaft 2 and the outer peripheral portion of the piston 3 fitted on the outer peripheral portion of the shaft 2. Is compressed by rotating along the inner periphery of the cylinder 6 and discharged from a discharge port (not shown). Further, the end surface of the lower bearing 1 is provided with a groove 5 provided on the sliding surface with the vane and a groove 5a that communicates the groove 5 with the compression mechanism suction side.

  The operation of the hermetic compressor configured as described above will be described below.

  The groove 5 provided in the lower bearing 1 is arranged on the vane end face that reciprocates by the rotation of the shaft 2, and the details thereof are shown in FIG. 2. One end of the groove 5 a is on the suction hole 9 side of the cylinder 6. Are arranged.

  When the hermetic compressor is in operation, the oil 12 accumulated in the lower portion of the pressure vessel 13 is provided inside the shaft 2 by the rotation of the shaft 2 in order to lubricate the sliding portion of the compressor mechanism. The oil is sucked up from the oil suction hole 11 and ejected from the oil hole 10 in the shaft 2 to lubricate the inner peripheral part of the upper bearing 7, the inner peripheral part of the lower bearing 1, and the inner peripheral part of the piston 3. At this time, the piston internal space 14 surrounded by the shaft 2 and the piston 3 is filled with oil 12, and this piston internal space 14 is connected to one end of the groove 5 in a high pressure state. One end of the groove 5a communicating with the groove 5 is disposed on the suction hole 9 side of the cylinder 6 and the periphery is on the low pressure side, so that the oil 12 passes through the groove 5 and the groove 5a and is supplied to the suction side 9 of the cylinder 6 by differential pressure. Will be. At this time, since the vane 4 passes through the groove 5 by reciprocating motion, the lubricity can be improved.

  Further, in the present embodiment, the state in which oil is supplied as shown in FIG. 3 and the state in which one end of the groove 5 is closed at the end surface portion of the piston 3 as shown in FIG. Therefore, it becomes intermittent lubrication, and it is easier to ensure lubrication of the inner peripheral part of the upper bearing 7, the inner peripheral part of the lower bearing 1, and the inner peripheral part of the piston 3 than in the normal oiling method, and the suction holes passing through the grooves 5 and 5a Since the flow rate to the side 9 can also be suppressed, refrigerant overheating on the suction side can be suppressed, and performance can be stabilized. Moreover, it is possible to prevent an increase in material costs and an increase in the number of assembly steps without increasing the number of parts compared to the prior art.

(Embodiment 2)
FIG. 5 also shows a shape in which the cross-sectional area of the groove 5 a disposed on the suction hole 9 side of the cylinder 6 is made smaller than the cross-sectional area on the side connected to the groove 5, that is, the piston internal space 14.

  The effect is the same as in the first embodiment, but the supply flow rate can be adjusted by reducing the cross-sectional area, so that it is possible to improve lubricity and improve performance according to the purpose. .

  As described above, since the hermetic compressor according to the present invention improves the lubricity of the vane sliding surface and enables high reliability and performance improvement, the hermetic compressor used in refrigeration equipment such as an air conditioner and a refrigerator. Applicable to mold compressor applications.

DESCRIPTION OF SYMBOLS 1 Lower bearing 2 Shaft 3 Piston 4 Vane 5 Groove 5a Groove 6 Cylinder 7 Upper bearing 8 Compression chamber 9 Suction hole 10 Oil hole 11 Oil suction hole 12 Oil 13 Pressure vessel 14 Piston internal space 109 Suction hole 112 Oil reservoir 122 Filter 123 Supply Tube 124 Holder 125 Hole

Claims (6)

A hermetic compression with a groove having a width smaller than the vane width on the sliding surface of the lower bearing end face with the vane reciprocating in the cylinder, and a communication groove extending from the groove to the suction side of the compression mechanism. Machine. The hermetic compressor according to claim 1, wherein HCFC, HFC or the like not containing chlorine is used as a refrigerant. The hermetic compressor according to claim 1, wherein a natural refrigerant such as carbon dioxide or ammonia is used as a refrigerant. 2. The hermetic compressor according to claim 1, wherein a cross-sectional area of the communication groove leading to the suction side is smaller than a cross-sectional area of the groove provided on the sliding surface with the reciprocating vane. The hermetic compressor according to claim 4, wherein HCFC, HFC or the like not containing chlorine is used as a refrigerant. The hermetic compressor according to claim 4, wherein a natural refrigerant such as carbon dioxide or ammonia is used as a refrigerant.