JP2004332687A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve lubricating performance and reduce sliding resistance at a sliding part of a compressor mechanism of a rotary compressor. <P>SOLUTION: Since a substantially spherical shot is injected on respective sliding surfaces of an upper bearing 8, a lower bearing 9, a crank pin 4 and a crankshaft 5 as components of the compressor mechanism of the rotary compressor to form recesses with a diameter of 0.1 to 10μm, an oil film is formed by the very small recesses. Since the recesses are discontinuous, the oil retention property of the respective sliding surfaces is increased. The lubricating performance is thus increased, so that the sliding resistance is reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil lubrication structure for a sliding portion in a rotary compressor.
[0002]
[Prior art]
One example of a conventional rotary compressor is shown in FIGS.
[0003]
A motor 2 and a rotary compression mechanism 3 driven by the motor 2 are housed inside the closed casing 1.
[0004]
The stator 2a of the motor 2 is fixed to the closed casing 1, and the rotor 2b is fixed to the upper part of the crankshaft 4.
[0005]
The rotary compression mechanism 3 includes a crankshaft 4, a rolling piston 6 fitted to a crankpin 5 formed integrally with the crankshaft 4, a sealing block 7 fixed to the closed casing 1, and an upper end of the sealing block 7. An upper bearing 8 for closing the opening, a lower bearing 9 for closing the lower end opening of the silling block 7, a blade 10 removably fitted into a slot 24 provided in the silling block 7 in a radial direction, and the blade A presser spring 11 and the like are disposed behind and push the presser 10.
[0006]
The rolling piston 6 is accommodated in the cylinder chamber 12 defined by the silling block 7, the upper bearing 8 and the lower bearing 9, and the tip of the blade 10 is brought into contact with the outer peripheral surface of the rolling piston 6 so that the blade 10 The suction chamber 13 is limited on one side and the compression chamber 14 is limited on the other side.
[0007]
The crankshaft 4 is supported by an upper bearing 8 and a lower bearing 9 respectively.
[0008]
When the crankshaft 4 is driven to rotate by the motor 2, the rolling piston 6 eccentrically rotates in the direction indicated by an arrow in the cylinder chamber 12, whereby gas is sucked from the suction pipe 20 into the suction chamber 13, and The gas in 14 is compressed.
[0009]
The compressed gas passes through a discharge port 22 provided in the upper bearing 8 and pushes up a discharge valve (not shown) to enter a discharge muffler chamber 27 limited by the upper bearing 8 and a cover 26 covering the upper surface thereof. Is discharged from below the motor 2 through a hole (not shown) provided through the motor 2 to the outside through a discharge pipe 16.
[0010]
A lubricating oil 17 is stored in the inner bottom of the closed casing 1, and the lubricating oil 17 is sucked by an oil pump 18 incorporated in the crankshaft 4, and passes through an oil supply passage 19 provided in the crankshaft 4. Oil is supplied to a sliding surface between the upper bearing 8 and the lower bearing 9, a sliding surface between the crankpin 5 and the rolling piston 6, a sliding surface between the rolling piston 6 and the cylinder block 7, and the like.
[0011]
The blade 10 and the lower part of the slot 24 are immersed in lubricating oil 17 and supplied with oil. Further, the lubricating oil supplied to the sliding surface between the rolling piston 6 and the cylinder block 7 and the lubricating oil contained in the gas sucked from the suction pipe 20 are supplied to the cylinder during the compression stroke of the gas in the compression chamber 14. Oil is supplied to the inner peripheral surface of the block 7, the outer peripheral surface of the rolling piston 6, the tip or side surface of the blade 10, and the upper and lower surfaces. With these lubrications, oil films are formed in the above-described portions to ensure sealing performance and reduce sliding resistance due to lubricating oil. In particular, it is important to maintain the oil level between the upper and lower bearings and the crankshaft and between the crankpin and the rolling piston, and problems such as increased sliding resistance and seizure due to lack of oil are likely to occur.
[0012]
In the above-mentioned conventional rotary compressor, each part is finished by cutting or grinding, etc., and the processing mark remains in a form keeping a fine and sharp tip, or as a linear mark in a certain direction. As a result, the oil film cannot be retained, causing the oil film to break, causing boundary lubrication, increasing the sliding resistance, and increasing the sliding loss.
[0013]
Further, as the oil level of the lubricating oil 17 is lowered, the lubricating oil is not supplied to each sliding surface, which may cause poor lubrication and a seizure accident based on the lubrication oil. A sliding member formed by impregnating and sintering any one of PEEK resin, polyimide resin or polyamide-imide resin in which a solid lubricant is mixed on a solid-metal sintered bimetal, or a combination thereof, on the crankshaft thrust and sliding surface of There was something provided. (For example, see Patent Document 1)
FIG. 6 shows a thrust plate provided on a lower bearing of a conventional compressor described in Patent Document 1.
[0014]
In FIG. 6, by providing a sliding member 30 impregnated and sintered with a polyimide resin or the like mixed with a solid lubricant in the sliding portion between the lower bearing and the crankshaft, even if the sliding area is small and an oil film is difficult to be formed. Due to the self-lubricating action, sliding loss and wear were reduced, and copper plating was suppressed.
[0015]
[Patent Document 1]
JP-A-2002-195180
[Problems to be solved by the invention]
However, the conventional structure described above is not easy to process and maintain the accuracy, and there is room for improvement in that the wear of the sliding member due to temperature changes and the frictional resistance of the sliding surface of the sliding member increase. was there.
[0017]
An object of the present invention is to solve the above-mentioned conventional problems and to provide a compressor with improved lubrication performance and reduced sliding resistance.
[0018]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist thereof is as follows.
[0019]
The invention according to claim 1 is characterized in that the concave portion is provided on one or both surfaces of the sliding surface between the rolling piston and the crankpin.
[0020]
The invention according to claim 2 is characterized in that the concave portion is provided on one or both surfaces of the sliding surfaces of the crankshaft and the upper bearing and the lower bearing.
[0021]
According to this configuration, the lubricating oil supplied to the fine concave portion is reliably held, an oil film is formed, and the lubricating property can be improved and the sliding resistance can be reduced.
[0022]
Each component may be employed individually or all may be employed simultaneously.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
(Embodiment 1)
In order to solve the above-mentioned problem, the invention described in claim 1 is shown in FIG. 1 to FIG.
[0025]
FIG. 1 shows a crankpin, and FIG. 3 shows a rolling piston. A recess is provided on one or both surfaces of the sliding surfaces 5a and 6d between the rolling piston and the crankpin. When the motor is rotationally driven, the crankpin rotates, and at the same time, the rolling piston rotates while rotating. At this time, the oil is supplied from the oil pump through the inside of the crankshaft to the inner periphery of the rolling piston and the sliding portion of the outer periphery of the crankpin. This lubricating oil is supplied to the concave portion provided on the outer periphery of the crankpin or the inner periphery of the rolling piston or the concave portion provided on both of them, and is reliably held. Thereby, the lubrication performance of the sliding surface can be improved.
[0026]
(Embodiment 2)
The invention described in claim 2 is shown in FIGS.
[0027]
1 shows a crankshaft, FIG. 4 shows an upper bearing, and FIG. 5 shows a lower bearing. A concave portion is provided on one or both surfaces of the sliding surfaces 4a, 4b, 4c, 8a, 9a, 9b of the crankshaft and the upper and lower bearings.
[0028]
When the motor is rotationally driven, the crankshaft rotates in the cylinder chamber and slides on the upper and lower bearing surfaces. Lubricating oil supplied from the oil pump through the crankshaft is supplied to the gap between the upper and lower bearings. The concave portion is provided in the crankshaft or the upper and lower bearings, and supplied and securely held in the concave portion. Thereby, the lubrication performance of the sliding surface can be improved.
[0029]
【The invention's effect】
As described above, in the compressor of the present invention, since the concave portions having a diameter of 0.1 to 10 μ are provided on the sliding surfaces of the crankpin, the crankshaft, the rolling piston, the upper bearing, and the lower bearing, the minute concave portions are formed. As a result, an oil film is formed, and the concave portions are discontinuous, so that the oil retaining property of each sliding surface is improved, lubricating performance is increased, sliding resistance can be reduced, and reliability such as image sticking can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a crankshaft and a crankpin according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a concave portion of a blade according to Embodiment 1 of the present invention. FIG. 3 is a diagram showing a rolling piston according to Embodiment 1 of the present invention. FIG. 4 is a view showing an upper bearing according to Embodiment 2 of the present invention. FIG. 5 is a view showing a lower bearing according to Embodiment 2 of the present invention. FIG. 6 is a view of a rotary compression mechanism including a conventional lower bearing with a thrust plate. FIG. 7 is a longitudinal sectional view of a conventional rotary compressor. FIG. 8 is a sectional view taken along the line AA in FIG.
DESCRIPTION OF SYMBOLS 1 Closed casing 2 Motor 2a Stator 2b Rotor 3 Rotary compression mechanism 4 Crankshaft 4a, 4b, 4c Sliding surface 5 Crank pin 5a Sliding surface 6 Rolling piston 6d Sliding surface 7 Silling block 8 Upper bearing 8a Sliding surface 9 Lower Bearings 9a, 9b Sliding surface 10 Blade 11 Holding spring 12 Cylinder chamber 13 Suction chamber 14 Compression chamber 16 Discharge pipe 17 Lubricating oil 18 Oil pump 19 Oil supply passage 20 Suction pipe 22 Discharge port 24 Slot 26 Cover 27 Discharge muffler chamber 30 Sliding Element

Claims (2)

An upper bearing and a lower bearing fixed to an end face of the cylinder block and the cylinder block; a rotating shaft that slides in the upper bearing and the lower bearing; and a crankshaft having a crankpin; and a rotatable crankshaft having the crankpin. In a rotary compressor constituted by a stored rolling piston and a blade abutting on the rolling piston and reciprocatingly sliding in a slot provided in the cylinder block, a closed sliding portion of a compression mechanism is formed. A rotary compressor characterized by injecting a substantially spherical shot on one or both surfaces of the sliding surface between the rolling piston and the crankpin, and providing a concave portion having a diameter of 0.1 to 10 μ on the surface. . A rotary compressor, wherein the concave portion is provided on one or both surfaces of sliding surfaces of the crankshaft and the upper bearing and the lower bearing.

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