JPH03199691A - Rotary compressor - Google Patents

Abstract

PURPOSE:To decrease the sliding speed of a thrust face so as to reduce its wear by interposing a ring which rotates together with rotation of a crankshaft on the thrust face between the crankshaft and upper and/or lower bearings. CONSTITUTION:An annular groove 30 is formed on the upper surface of a lower bearing to surround a hole piercing through a crankshaft 4 and a circular ring 31 is rotatably and loosely fitted in the annular groove. The upper surface 32 of this ring 31 is adjacent to a crankpin 5 and is allowed to abut on the lower surface 52 of a hub 51 below the crankpin to construct a thrust face, and lubricating oil which has lubricated the surface between the crankpin 5 and a rolling piston 6 is filled in the groove 30. The rotation of the crankshaft 4 causes the ring 31 to rotate therewith at a speed slower than the rotational speed of the crankshaft 4 so that sliding speed between the lower surface 52 of the hub and the upper surface of the ring 32 is decreased to reduce those quantities of wear remarkably.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a rotary compressor.

(Prior Art) An example of a conventional electric hermetic rotary compressor is shown in FIGS. 3 and 4.

Inside the casing 1, a motor 2 consisting of a stator 2a and a rotor 2b, and a horizontal rotary compressor 3 driven by the motor 2 are housed.

A stator 2a of the motor 2 is fixed to the casing 1, and a rotor 2b is fixed to the upper end of the crankshaft 4.

The rotary compression a side 3 closes the crankshaft 4, the rolling piston 6 fitted to the crank pin 5 of the crankshaft 4, the cylinder block 7 fixed to the casing l, and the upper end opening of the cylinder block 7. An upper bearing 8, a lower bearing 9 that closes the lower end opening of the cylinder block 7, a blade 1O supported by the cylinder block 7 so as to be freely retractable, and a presser spring disposed behind the blade 1o to push it. It consists of 11 mag.

A rolling piston 6 is placed in a cylinder chamber 12 bounded by a cylinder block 7, an upper bearing 8 and a lower bearing 9.
, and by bringing the tip of the blade 10 into contact with the outer circumferential surface of the rolling piston 6, a suction chamber 13 is formed on one side of this blade IO, and a compression chamber 14 is limited on one side of the blade IO.

The crankshaft 4 is supported by an upper bearing 8 and a lower bearing 9 at the upper and lower parts of the crank pin 5, respectively.

When the crankshaft 4 is rotationally driven by the motor 2, a rolling piston 6 fitted to the crank pin 5
rotates eccentrically in the direction of the arrow within the cylinder chamber 12 while slidingly contacting the inner circumferential surface of the interior 7 of the cylinder chamber 12 . At the same time, low pressure gas is sucked into the suction chamber 13 from the suction pipe 20, and the gas in the compression chamber 14 is compressed.

The compressed gas passes through a discharge boat (not shown) bored in the upper bearing 8, pushes up the discharge valve, enters the discharge muffler 27 bounded by the upper bearing 8 and the cover 26 covering its upper surface, and absorbs its pulsating component. The motor 2 is then removed through a hole (not shown) drilled in the cover 26.
The pulsating component is further removed by entering the first expansion chamber 28 defined between the rotary compression mechanism 3 and the rotary compression mechanism 3 and expanding.

Next, through the gap between the stator 2a and the rotor 2b and the gap between the stator 2a and the gauging l, the motor 2 enters the second expansion chamber 15 defined above and expands, thereby further reducing the pulsation component. removed.

Then, it is discharged to the outside through the discharge pipe 16.

Lubricating oil 17 is stored in the inner bottom of the casing 1, and this lubricating oil 17 is pumped up by a centrifugal oil pump 18 built into the crankshaft 4 and sent to the crankshaft via an oil supply passage 19 bored in the crankshaft 4. 4
The sliding surfaces between the upper bearing 8 and the lower bearing 9, the sliding surfaces between the crank pin 5 and the rolling piston 6, the sliding surfaces between the rolling piston 6 and the cylinder 7, etc. are supplied with oil.

(It!fi to be solved by the invention) In the above conventional rotary compressor, the thrust surface between the crankshaft 4 and the upper bearing 8 and the thrust surface between the crankshaft 4 and the lower bearing 9 are Lubricating oil is not forcibly supplied, and since there is a phase difference between the gas pulsations in the first expansion chamber 28 and the gas pulsations in the second expansion chamber 15, these compartments The crankshaft 4 is vibrated vertically due to fluctuations in the differential pressure between the two, and noise is generated due to collision between the crankshaft 4 and the upper bearing 8 or the lower bearing 9.

Furthermore, since the weight of the stator 2a of the motor 2 and the crankshaft 4 is loaded onto the thrust surface between the crankshaft 4 and the lower bearing 9, there is a problem in that the thrust surface is subject to large wear.

(Means for solving the problem) The smaller the surface pressure and sliding speed, the more the wear of the sliding member can be reduced.

The present invention has been made with the above in mind, and its gist is to provide a crankshaft equipped with a crankpin into which a rolling piston is fitted. and a rotary compressor supported by a lower bearing, characterized in that a ring that rotates as the crankshaft rotates is fitted on the thrust surface between the crankshaft and the upper and/or lower bearings. In the rotary compressor.

(Function) Since the present invention has the above-mentioned configuration, when the crankshaft rotates, the ring rotates accordingly, reducing the sliding speed of the thrust surface, resulting in wear on the thrust surface. can be reduced.

(Example) A first embodiment of the invention is shown in FIG.

An annular groove 30 is bored in the upper surface of the lower bearing 9 so as to surround a hole through which the crankshaft 4 passes, and an annular ring 31 is loosely fitted into the groove 30 so as to be freely rotatable. The upper surface 32 of this ring 31 comes into contact with the lower surface 52 of the hub 2 51 formed below adjacent to the crank pin 5, and these upper surface ta and lower surface 52
constitutes the thrust surface. And crank pin 5
The lubricating oil that lubricates between the piston 6 and the groove 3
Filled with 0.

When the crankshaft 4 rotates, the ring 31 rotates along with it and rotates at a lower speed than the rotational speed of the crankshaft 4, so the sliding speed between the lower surface 52 of the hub 51 and the upper surface 32 of the ring 31 increases. As a result, the amount of wear on these items is significantly reduced.

As shown in FIG. 2, an annular ring 33 may be loosely fitted to the crankshaft 4 below the crank pin 5, and the lower surface 34 of this ring 33 may be attached to the upper surface 91 of the lower bearing 9. can.

In the above embodiment, the ring is fitted to the thrust surface between the crankshaft 4 and the lower bearing 9, but it is also possible to fit the ring to the thrust surface between the crankshaft 4 and the upper bearing 8. can.

(Effect of Development U11) In the present invention, since a ring that rotates as the crankshaft rotates is fitted on the thrust surface between the crank shirt 1- and the upper bearing or the lower bearing, the sliding speed of the thrust surface As a result, the wear on the thrust surface can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view showing a first embodiment of the present invention;
FIG. 2 is a partial vertical sectional view showing a second embodiment of the invention. Figures 3 and 4 show an example of a conventional rotary compressor, with Figure 3 being a longitudinal sectional view and Figure 4 being IV-I in Figure 3.
It is a cross-sectional view along the V line. Rolling piston-6, crank pin-5, crankshaft-4, upper bearing-8, lower bearing 9, thrust I.
flush 52.91.32.34, ring-319

Claims (1)

[Claims] A rotary compressor comprising a crankshaft equipped with a crankpin into which a rolling piston is fitted, supported by an upper bearing and a lower bearing at the upper and lower parts of the crankpin, wherein the crankshaft and the upper bearing and/or the lower bearing A rotary compressor characterized in that a ring that rotates as the crankshaft rotates is fitted on the thrust surface between the two.