JP2006070779A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate installation of an oil pumping up means such as a paddle by enlarging a centrifugal force generated by rotation of a rotational shaft and to reduce costs. <P>SOLUTION: In this compressor, inside a closed vessel having an oil reservoir 7 on the bottom part, a compression element 3, an electric element 4, and the rotational shaft 5 having an oil supply hole 17 for supplying oil in the oil reservoir 7 to a sliding part of the compression element 3 and transmitting rotation of the electric element 4 to the compression element 3 are stored. A center 30 of an oil supply hole 17A in the lower part side of the oil supply hole 17 is provided, so as to be deviated by 1.6 mm from an axial center 50 of the rotational shaft 5 and be inclined to the axial center 50 at 1.2° in the approximately deviated direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor that compresses a refrigerant in a refrigerating apparatus such as an air conditioner, a water heater, a car air conditioner, a showcase, a freezer / refrigerator, and a vending machine.

  Conventionally, oil supply means in a general compressor rotates an oil pump member composed of a cylindrical oil pickup formed by press-drawing an iron plate or an iron pipe and a paddle formed by processing a thin plate. The lower end of the shaft is press-fitted and attached, and oil is supplied to each sliding portion using centrifugal force generated by the rotation of the rotating shaft (see, for example, Patent Document 1).

  However, since the conventional oil supply means is formed by pressing an iron plate, an iron pipe, or the like, there is a problem in that the oil pump performance is difficult to obtain and the oil pump characteristics may be impaired.

  Therefore, in order to increase the processing accuracy, a) the oil pump is integrally formed of resin (see Patent Document 2), b) it is integrally formed by metal injection molding (see Patent Document 3), and c) plastic. Proposals have been made such that the formed oil pickup is locked to a rotating shaft with a gas venting part that also serves as a mounting pin (see Patent Document 4).

  FIG. 3 is an explanatory view showing a cross-sectional structure of a rotating shaft of a conventional compressor. The rotary shaft 5 is provided with an oil supply hole 17 for supplying oil to sliding portions such as a compression element and a bearing (not shown) at the center. An oil pickup 21 is attached to the lower end of the rotating shaft 5 and communicates with the oil supply hole 17 and is attached so that the lower end is hidden in oil in an oil reservoir (not shown). The oil pickup 21 is formed integrally with a paddle 24 that improves oil supply capability.

  In the compressor in which the oil supply means is configured as described above, when the electric element (not shown) is energized, the rotating shaft 5 rotates, and the piston of the compressing element (not shown) reciprocally slides in the cylinder by the crank pin 12 of the rotating shaft 5. Then, the refrigerant is compressed.

  Then, the oil in the oil reservoir (not shown) passes through the oil supply hole 17 from the oil pickup 21 attached to the lower end of the rotary shaft 5 due to the centrifugal force generated by the rotation of the rotary shaft 5, and the sliding portions of the bearings and compression elements (not shown). To be supplied. 17A indicates an oil supply hole on the oil pickup 21 side, and 17B indicates an oil supply hole on the oil outlet 22 side. Reference numeral 23 denotes a vent hole.

However, the center of the oil supply hole 17 </ b> A on the oil pickup 21 side is provided so as to coincide with the axis of the rotary shaft 5, and the oil supply hole 17 is provided so that both center lines thereof are aligned with and parallel to the rotary shaft 5. Therefore, the centrifugal force generated by the rotation of the rotary shaft 5 is small, and it is essential to install oil pumping means such as the paddle 24, which is an obstacle to cost reduction. It was.
No. 1-330631 Japanese Patent Publication No. 63-38553 JP-A-2-86971 JP-A-6-17755

  It is an object to increase the centrifugal force generated by the rotation of the rotating shaft, thereby eliminating the need for installing an oil pumping means such as a paddle and reducing the cost.

  The present invention includes an electric element, a compression element, and an oil supply hole that supplies oil in the oil reservoir to a sliding portion of the compression element in a sealed container having an oil reservoir at the bottom, and transmits the rotation of the electric element to the compression element. In the compressor in which the rotary shaft is housed, the center of the lower opening of the oil supply hole that is hidden in the oil reservoir is provided to be shifted from the axis of the rotary shaft, and the oil supply hole is substantially displaced with respect to the rotary shaft. Compressor characterized by being inclined at an angle of 1 degree or more

The center of the lower opening which is hidden in the oil reservoir of the oil supply hole is shifted from the axis of the rotary shaft, and the oil supply hole is inclined at an angle of 1 degree or more with respect to the rotary shaft in the substantially shifted direction. Therefore, the centrifugal force with respect to the oil generated by the rotation of the rotating shaft is increased.
Therefore, it is not necessary to install oil pumping means such as paddles, and the cost can be reduced.

  An electric element in a sealed container having an oil reservoir at the bottom, a compression element, and a rotation shaft that includes an oil supply hole that supplies oil in the oil reservoir to the sliding portion of the compression element and transmits the rotation of the electric element to the compression element. In the stored compressor, the center of the lower opening of the oil supply hole which is not provided with an oil pumping means such as a paddle and is hidden in the oil reservoir is shifted from the axis of the rotary shaft, and the direction of the oil supply hole is substantially shifted. The compressor is provided so as to be inclined at an angle of 1 degree or more with respect to the rotation axis.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. In order to facilitate understanding, in these drawings, the same reference numerals are given to portions having the same functions as those described in FIG.

  Reference numeral 1 denotes an airtight container, in which a motor case 2, a compression element 3 disposed above the motor case 2, an electric element 4 disposed below, and a rotation of the electric element 4 are compressed. A rotating shaft 5 for transmitting to the element 3 is accommodated.

  The compression element 3, the electric element 4, etc. are suspended and supported by the elastic support means 6 on the inner wall of the sealed container 1 via the motor case 2. An oil reservoir 7 is provided in the sealed container 1 for storing refrigerator oil at the bottom.

The electric element 4 includes a stator 9 provided with a coil 8 therein, and a rotor 10 disposed inside the stator 9 and having a rotating shaft 5 inserted in the center thereof.
The compression element 3 includes a cylinder 11, a piston 13 that is fitted in the crank pin 12 of the rotary shaft 5 and reciprocally slides in the cylinder 11, and a cylinder head 15 that is attached to the end surface of the cylinder 11 via a valve seat 14. It consists of and. A bearing 16 that pivotally supports the rotating shaft 5 is formed integrally with the motor case 2.

  The rotary shaft 5 is provided with an oil supply hole 17 for pumping up the oil in the oil reservoir 7 and supplying it to the sliding parts such as the compression element 3 and the bearing 16. The oil supply hole 17 is provided by shifting the center 30 of the lower oil supply hole 17A by 1.6 mm from the axis 50 of the rotating shaft 5 and is inclined by 1.2 degrees with respect to the axis 50 in a substantially shifted direction. It is provided in the state. 22 is an oil outlet hole, and 23 is a gas vent hole.

  In the compressor in which the oil supply hole 17 is provided in this way, when the electric element 4 is energized, the rotor 10 rotates the rotating shaft 5 and the rotation of the electric element 4 is transmitted to the compression element 3. The piston 13 of the compression element 3 reciprocates in the cylinder 11 by the crank pin 12 of the rotating shaft 5 and compresses the refrigerant. The oil in the oil reservoir 7 passes through the oil supply holes 17 provided on the rotating shaft 5 by the centrifugal force generated by the rotation of the rotating shaft 5, and the sliding portions of the bearing 16 of the motor case 2 and the compression element 3. To be supplied.

  That is, in the compressor of the present invention, the center 30 of the lower oil supply hole 17A is provided by being shifted by 1.6 mm from the axis 50 of the rotary shaft 5, and the oil supply hole 17 is arranged in a substantially shifted direction. By providing an inclination at an angle of 1.2 degrees with respect to the core 50, the centrifugal force against the oil generated by the rotation of the rotating shaft 5 also increases on the lower side, and the paddle required in the conventional compressor It is no longer necessary to install oil pumping means.

  It should be noted that even when the rotational speed of the compression element 3, specifically the motor, is lowered to about 25 to 32 Hz by inverter control or the like, sufficient oil is pumped on the lower side of the oil supply hole 17. The distance of the center 30 of the oil supply hole 17A from the axis 50 of the rotary shaft 5 needs to be at least 1.4 mm.

  In the above embodiment, the oil supply hole 17 is inclined by 1.2 degrees with respect to the axis 50 of the rotating shaft 5. However, the center 30 of the lower oil supply hole 17 </ b> A is set to the axis of the rotating shaft 5. Even if it is provided with a displacement of 50 mm from 1.6 mm and the centrifugal force on the lower side is increased, if the inclination angle is less than 1.0 degree, the action of oil rising through the inside of the oil supply hole 17 becomes small. Needs to be provided at an inclination angle of 1.0 degree or more with respect to the axis 50 of the rotating shaft 5.

  If the oil supply hole 17 is too thin, the gas venting action is reduced. If the oil supply hole 17 is too thick, the strength of the rotary shaft 5 is reduced. Therefore, it is preferable that the oil supply hole 17 is appropriately determined depending on the type of oil, the type and size of the compressor, and operating conditions.

  The refrigerant used in the compressor of the present invention is not particularly limited, and is a refrigerant not containing a chlorine group, such as difluoromethane (HFC-32, R-32), 1,1-difluoroethane (HFC-152a, R -152a), trifluoromethane (HFC-23, R-23), pentafluoroethane (HFC-125, R-125), 1,1,1,2-tetrafluoroethane (HFC-134a, R-134a), Hydrocarbons such as 1,1,1-trifluoroethane (HFC-143a, R-143a), fluorocarbon refrigerants (FC refrigerants) that do not contain chlorine and hydrogen, methane, ethane, propane, butane, pentane, hexane Natural refrigerants such as system refrigerants and carbon dioxide can be used.

  The refrigerating machine oil used in the compressor of the present invention may be a natural product such as naphthenic oil, paraffin oil, alkylbenzene oil or a natural product, a synthetic product such as polyether oil, polyol ester oil, or a mixture thereof. But it is not particularly limited.

  The refrigerator oil used in the compressor of the present invention includes 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 An effective amount of other known additives such as an extreme pressure additive and an extreme pressure additive composed of a combination thereof can be blended.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit described in the claims.

  For example, in the above description, the vertical type reciprocating compressor has been described. However, the present invention is not particularly limited in the type of the compressor. Specifically, the rotary compressor, the vibration compressor, and the multivane rotary type are used. A compressor, a scroll type compressor, etc. may be sufficient.

It is explanatory drawing of this invention compressor. It is explanatory drawing of the principal part of this invention compressor, (A) is explanatory drawing which shows the cross-section of the rotating shaft in which the oil supply hole was formed, (B) is explanatory drawing which shows the lower end part of a rotating shaft. It is explanatory drawing which shows the principal part of the prior art applicable to FIG. 2 (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Motor case 3 Compression element 4 Electric element 5 Rotating shaft 6 Elastic support means 7 Oil reservoir 8 Coil 9 Stator 10 Rotor 11 Cylinder 12 Crankpin 13 Piston 14 Valve seat 15 Cylinder head 16 Bearing 17 Oil supply hole 21 Oil pickup 22 Oil outlet hole 23 Gas vent hole 30 (center of oil supply hole) 50 Center axis

Claims (1)

  An electric element in a sealed container having an oil reservoir at the bottom, a compression element, and a rotation shaft that includes an oil supply hole that supplies oil in the oil reservoir to the sliding portion of the compression element and transmits the rotation of the electric element to the compression element. In the housed compressor, the center of the lower opening of the oil supply hole that is hidden in the oil reservoir is shifted from the axis of the rotary shaft, and the oil supply hole is at least one degree with respect to the rotary shaft in the substantially shifted direction. A compressor characterized by being inclined at an angle of

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