JP2008014261A - Rotary electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve both of performance and reliability by supplying oil into a cylinder from a minute oil supply groove installed on a partition plate to eliminate shortage of oil quantity. <P>SOLUTION: This rotary electric compressor has a minute oil supply groove 14 installed on the partition plate 9. The oil supply groove provided on the partition plate 9 is installed to open to a compression chamber side in a cylinder. Also, the oil supply groove is established to be intermittently opened to and closed from an intake chamber or a compression chamber by a surface of a cylinder abutting on the partition plate 9. Depth, width and position of the oil supply groove are established to keep weight ratio of quantity of oil flowing in the intake chamber and the compression chamber from the oil supply groove, and quantity of intake refrigerant of the compressor at 0.3 or less. Consequently, quantity of oil flowing into the compression chamber is controlled by making the oil supply groove provided on the partition plate intermittently opened to and closed from the compression chamber by a contact surface with the cylinder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary electric compressor used in a cooling device such as an air conditioner or a refrigerator.

  Conventionally, rolling piston type rotary compressors have been used in cooling devices such as air conditioners or refrigerators.

  This type of compressor is shown in FIG. As shown in the figure, the hermetic container 101 includes a compression mechanism 102, a stator 104 constituting the electric motor 103, a rotor 105, and a crankshaft 106 that transmits the rotation of the electric motor 103 to the compression mechanism 102. . Further, the sealed container 101 is provided with a suction pipe 107 for sucking low-pressure refrigerant gas and a discharge pipe 108 for discharging high-pressure refrigerant gas.

  In the above configuration, when the rotor 105 constituting the electric motor 103 rotates, the rotation is transmitted to the compression mechanism unit 102 by the crankshaft 106. When the compression mechanism 102 rotates and a compression action is generated, the low-pressure refrigerant gas sucked from the suction pipe 107 is boosted to a high-pressure refrigerant gas by the compression mechanism 102 and discharged into the sealed container 101. Thereafter, the high-pressure refrigerant gas passes through the gap of the electric motor 103, cools the stator 104 and the rotor 105, and is then discharged from the discharge pipe 108 to the refrigeration cycle (not shown).

In such a compressor, a small amount of oil appropriately leaks into the compression chamber from the assembly gaps of the components, and these oils provide good lubrication in the compression mechanism 102 during normal operation. Some of them are used to seal gaps between components (see, for example, Patent Document 1).
Japanese Patent Application Laid-Open No. 07-174089

  In the conventional compressor described above, the amount of oil supplied to the compression chamber is arbitrarily oozed out of the gaps between the components into the compression chamber. At present, the amount of oil to be supplied is determined. For this reason, sometimes the lubrication oil does not reach the contact parts of each component due to insufficient supply and wear progresses, or the sufficient sealing performance due to oil cannot be obtained in each gap, leading to performance degradation due to leakage It has become.

  The present invention solves such a conventional problem, eliminates the shortage of the oil amount by supplying a sufficient amount of oil to the compression chamber, and provides a high-performance rotary electric compressor with high performance and reliability. The purpose is to provide.

  In order to solve the above problems, in the present invention, a fine oil supply groove is provided in the partition plate. Moreover, it installed so that the oil supply groove | channel provided in the partition plate might open to the compression chamber side in a cylinder. Further, the oil supply groove was set so that the oil supply groove of the partition plate intermittently opens and closes to the suction chamber or the compression chamber by the surface of the cylinder in contact with the partition plate. Further, the depth, width and position of the oil supply groove were set so that the mass ratio of the amount of oil flowing from the oil supply groove into the suction chamber or the compression chamber and the refrigerant suction amount of the compressor was 0.3 or less.

  Since the rotary electric compressor of the present invention can supply a sufficient and optimal amount to the compression chamber, it is possible to provide a high-performance rotary electric compressor having both high performance and reliability.

  According to the first aspect of the present invention, oil can be supplied into the cylinder from a fine oil supply groove installed in the partition plate.

  According to the second aspect of the present invention, since the oil supply groove provided in the partition plate is installed so as to open to the compression chamber side in the cylinder, heating of the suction refrigerant by the oil can be avoided.

  In the third aspect of the invention, the oil supply groove is set so that the oil supply groove of the partition plate intermittently opens and closes to the suction chamber or the compression chamber by the surface of the cylinder in contact with the partition plate. You can control the amount.

  According to a fourth aspect of the present invention, the depth, width and position of the oil supply groove are set so that the mass ratio of the amount of oil flowing into the compression chamber from the oil supply groove and the refrigerant suction amount of the compressor is 0.3 or less. The influence of the oil supply on the refrigeration cycle can be ignored.

  These effects are conspicuous in alternative refrigerants and natural refrigerants in which the pressure of the refrigeration cycle is high and the load on the compression mechanism is large.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, in a rotary electric compressor of the rotary type, a stator 4 of an electric motor 3 that drives a compression mechanism 2 is fixed inside a sealed container 1, and the compression mechanism 2 is attached to a rotor 5 of the electric motor 3. Is connected to a crankshaft 6.

  The compression mechanism 2 includes a roller 7 driven by a crankshaft 6, a cylinder 8 that is a cylindrical cylinder, and a partition plate 9 that abuts against the roller 7 and partitions the inside of the cylinder 8 into a suction chamber 8a and a compression chamber 8b. It is comprised by the end plate holding both end surfaces. Here, the end plate is disposed so as to be sandwiched from above and below by the main end plate 10 also serving as a bearing for holding the crankshaft 6 and the auxiliary end plate 11, and is fixed to the sealed container 1 by welding on the outer periphery of the main end plate 10. . The cylinder 8 is provided with a suction hole 12 and guides suction gas into the suction chamber 8a through a suction connection pipe 13 press-fitted into the suction hole 12.

  Here, FIG. 2 shows the first, second and third embodiments of the present invention. The partition plate 7 has a fine oil supply groove 14, and an oil reservoir and a compression chamber 8b on the outer periphery of the cylinder 8 are provided. It is in the form of communication. The oil flows into the compression chamber 8b from the groove, and at the same time, the oil supply groove 14 is installed at a position where the roller 7 is pivoted to intermittently open and close the compression chamber 8b on the contact surface with the cylinder 8. Therefore, the opening / closing timing can be adjusted according to the position of the oil supply groove 14, so that the oil supply amount can be controlled. Further, since the oil supply groove is installed so as to open to the compression chamber side in the cylinder, heating of the suction refrigerant by the oil can be avoided.

As described above, since the rotary electric compressor according to the present invention can supply a sufficient and optimum amount to the compression chamber, a high-performance rotary electric compressor having high performance and reliability is provided. Therefore, it can be applied to uses such as a dehumidifier, a dryer, and a heat pump type hot water heater.

The longitudinal cross-sectional view of the compressor which shows the Example of this invention Detailed view of Embodiment 1 of the present invention Vertical section of a conventional compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 3 Electric motor 7 Roller 8 Cylinder 8a Suction chamber 8b Compression chamber 9 Partition plate 10 Main end plate 14 Oil supply groove

Claims (6)

An electric motor in a sealed container, a crankshaft driven by the electric motor, a roller driven by the crankshaft, a cylinder for storing the roller, an abutment chamber and a compression chamber inside the cylinder in contact with the cylinder and the roller And a main end plate that serves as a bearing that contacts the both end surfaces of the cylinder and holds the crankshaft, and an auxiliary end plate, and the partition plate is provided with fine oil supply grooves. Rotary electric compressor. The rotary electric compressor according to claim 1, wherein the oil supply groove provided in the partition plate is installed so as to open to a compression chamber side in the cylinder. The rotary electric compressor according to claim 1 or 2, wherein the oil supply groove is set so that the oil supply groove of the partition plate intermittently opens and closes to the suction chamber or the compression chamber by the surface of the cylinder that abuts the partition plate. . The depth, width and position of the oil supply groove are set so that the mass ratio of the amount of oil flowing from the oil supply groove into the suction chamber or the compression chamber and the refrigerant suction amount of the compressor is 0.3 or less. The rotary electric compressor according to claim 3. The rotary electric compressor according to any one of claims 1 to 4, wherein the gas to be compressed is an alternative refrigerant that does not contain chlorine. The rotary electric compressor according to any one of claims 1 to 4, wherein the gas to be compressed is a natural refrigerant such as carbon dioxide.

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