JP2009150249A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein an oil blade is deformed or dropped owing to biting of foreign matters etc., leading to shortage of oil supply and wear and seizing in a sliding part, in a rotary type hermetic compressor in which an electric motor and a rotary type compression mechanism part connected to the electric motor are stored within a closed container with an oil reservoir in the bottom part, and which discharges gas compressed by the compression mechanism part to inside the closed container once to achieve a high pressure inside the container, sucks oil by the oil blade mounted to a rotating shaft inner part connecting the electric motor to the compression mechanism part, and supplies oil from an oil filler bored in a rotating shaft intermediate part to a bearing part. <P>SOLUTION: A spiral oil groove is provided inside a shaft to supply oil without using an additional component such as an oil blade. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, an electric motor part and a compressor part are provided in a closed container having an oil reservoir at the bottom, and a rotary shaft that transmits the rotational force of the motor to the compressor part is housed, and one end of the rotary shaft is stored in the oil reservoir. The present invention relates to a structure of a hermetic compressor having oil supply holes that are immersed in oil and that supply oil to a sliding portion of the compressor from a communication hole provided in the middle of a rotating shaft.

Conventionally, the oil supply device of a general hermetic compressor is an oil pump member composed of a cylindrical oil blade formed by press drawing an iron plate or an iron pipe and a paddle formed by processing a thin plate. Is attached by press-fitting to the lower end of the rotating shaft, and oil is supplied to each sliding portion using centrifugal force generated by the rotation of the rotating shaft (see Patent Document 1). However, the oil blade is deformed or dropped out due to the biting of foreign matter, resulting in insufficient oil supply, causing problems such as abnormal wear and seizure of the sliding part. Therefore, an oil supply mechanism that does not require special parts such as an oil blade is required.
No. 1-330631

  In a conventional compressor, when a foreign object is caught in an oil blade that raises oil, the oil blade is deformed or dropped. For this reason, sufficient oil cannot be supplied to the sliding portion of the compression mechanism portion, leading to problems such as abnormal wear and seizure of the sliding portion.

  The present invention has been made based on the above circumstances, and an object thereof is to provide an oil supply mechanism that does not require special parts such as an oil blade, has high reliability, and can supply oil stably. A hermetic compressor is provided.

  In order to satisfy the above object, the hermetic compressor of the present invention is provided with a spiral oil groove for sucking up oil inside the rotary shaft.

  According to the present invention, since the oil supply mechanism is not deformed or dropped by foreign matter, oil can be stably supplied to the sliding portion.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is an explanatory view for explaining an embodiment of an oil supply device for a hermetic compressor according to the present invention, and FIG. 2 is a cross section of a rotating shaft and an oil supply hole of the oil supply device for the hermetic compressor shown in FIG. It is explanatory drawing which shows a structure. Reference numeral 1 denotes an airtight container in which an electric motor 2, a compression mechanism portion 3 disposed below the electric motor 2, and a rotating shaft 4 that transmits the rotational force of the electric motor 2 to the compression mechanism portion 3 are housed. ing. An oil 5 is provided in the bottom of the sealed container 1. The electric motor 2 includes a stator 7 having a winding 6 therein, and a rotor 8 disposed inside the stator and having a rotary shaft 4 inserted in the center thereof. The rotating shaft 4 is hollow, and a spiral oil groove 13 is provided along the inner wall. The compression mechanism unit 3 includes a cylinder 9, a piston 10 that rotates and slides in the cylinder by the rotation of the rotary shaft 4, an upper bearing 11 that is attached to an end surface of the cylinder 9, and a lower bearing 12.

  In the oil supply device of the hermetic compressor configured as described above, when the electric motor 2 is energized, the rotor 8 and the rotating shaft 4 rotate, and the rotational force of the electric motor 2 is transmitted to the compression mechanism unit 3. At this time, the oil 5 rises along the spiral oil groove 13 provided on the inner wall of the rotating shaft 4 due to the centrifugal force generated by the rotation of the rotating shaft 4 and the surface tension of the oil 5, and the oil holes 14a and 14b Then, it supplies to each sliding part of the upper bearing 11 and the compression mechanism part 3. FIG.

(Embodiment 2)
In recent years, a compressor using an HFC refrigerant not containing chlorine has been developed from the viewpoint of protecting the ozone layer. It is also possible to use a compressor having this mechanism for such an HFC refrigerant.

(Embodiment 3)
In recent years, compressors using natural refrigerants such as carbon dioxide, helium, and ammonia have been developed from the viewpoint of preventing global warming. The present invention can be applied to a compressor using such a natural refrigerant.

(Embodiment 4)
Normally, various types of oil are used in the compressor depending on the refrigerant used and the material used for the compression mechanism section 3. The present invention relates to natural products or oils derived from natural products such as naphthenic oil, paraffin oil and alkylbenzene oil, which are mainly used in compressors, and synthetic oils such as polyether oils and polyol ester oils, or the above natural oils. It is also possible to apply to mixed oils of oils derived from products or natural products and synthetic oils.

(Embodiment 5)
In order to improve mechanical properties, various additives may be added to the oil. The present invention comprises a copper deactivator such as benzotriazole, a sulfur-based extreme pressure additive, a halogen-based extreme pressure additive, a phosphorus-based extreme pressure additive, an organometallic compound-based extreme pressure additive, and combinations thereof. It can also be applied to a compressor containing an effective amount of an extreme pressure additive or the like.

  As described above, since the hermetic compressor according to the present invention does not cause deformation or dropout of the oil supply mechanism due to foreign matter, oil can be stably supplied to the sliding portion. It can be applied to refrigeration equipment such as dehumidifiers and dryers as well as heat pump water heaters.

Vertical section of hermetic compressor Longitudinal section of rotating shaft

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing case 2 Electric motor 3 Compression mechanism part 4 Rotating shaft 5 Oil 6 Winding 7 Stator 8 Rotor 9 Cylinder 10 Piston 11 Upper bearing 12 Lower bearing 13 Oil groove 14a Oiling hole 14b Oiling hole

Claims (5)

A sealed container having an oil reservoir at the bottom is provided with an electric motor and a compression mechanism, and a rotating shaft that transmits the rotational force of the electric motor to the compression mechanism is housed. One end of the rotating shaft is immersed in the oil in the oil reservoir. A hermetic compressor for supplying oil to a sliding portion of the compressor from an oil supply hole provided in the middle of the rotating shaft, wherein a helical oil groove is provided inside the rotating shaft. Mold compressor. 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, ammonia, or helium is used as a refrigerant. Natural products such as naphthenic oils, paraffin oils, alkylbenzene oils, or oils derived from natural products, and synthetic oils such as polyether oils and polyol ester oils, or mixed oils of the above natural products or natural products and oils The hermetic compressor according to claim 1, wherein An oil consisting of a copper deactivator such as benzotriazole, a sulfur-based extreme pressure additive, a halogen-based extreme pressure additive, a phosphorus-based extreme pressure additive, an organometallic compound-based extreme pressure additive, and a combination thereof. The hermetic compressor according to claim 1, wherein a pressure additive is blended.