JPH10288178A - Sealed rolling piston compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lubricating defective and seizing by forming a groove passage by performing taper working for the corner part on at least upper end side of the inner peripheral surface of a rolling piston and forming an oil passage led to an oil feeding route from inner peripheral side of the rolling piston to a gap of a rotary shaft and an upper bearing via this groove passage. SOLUTION: A groove passage 47 is formed by performing taper working for the corner part on the upper end side of the inner peripheral surface of a rolling piston 6. When a compressor is started after it is stopped for a long period, oil pumped up from an oil tank and liquid coolant enter a gap of the inner peripheral surface of the rolling piston 6 and the outer peripheral surface of a crank 5 via an oil feeding passage 19, an oil hole 40 and a recessed part 41 and liquid coolant foams and evaporates here. This gas coolant enters void space 43 via the groove passage 47 and is discharged from the upper end via the oil hole 44 and an oil feeding passage 19 from here. The gas coolant is discharged from the upper end of the upper bearing 38 to the inside of a housing through a spiral groove 45. Thus, a lubricating defective and seizing can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rolling piston compressor incorporated in an air conditioner or the like.

[0002]

2. Description of the Related Art One example of a conventional hermetic rolling piston type compressor is shown in FIGS. A motor 2 is disposed in the upper portion of the sealed housing 1, a rolling piston type compression mechanism 3 is disposed in a lower portion thereof, and an oil reservoir 17 is formed in a lower portion thereof. The stator 2a of the motor 2 is fixed to the housing 1, and the rotor 2b is fixed to the upper part of the rotating shaft 4.

[0003] The rolling piston type compression mechanism 3 includes a rolling piston 6 fitted to the crank 5 of the rotating shaft 4 so as to be relatively rotatable, and a cylinder 7 fixed to the housing 1.
And an upper lid 8 attached to the cylinder 7 to close an upper end opening thereof, a lower lid 9 to close a lower end opening of the cylinder 7, and supported so as to be able to protrude and retract into a slot 34 formed in the cylinder 7. It comprises a blade 10 and a spring 11 disposed behind the blade 10 to push the blade.

A rolling piston 6 is accommodated in a cylinder chamber 12 defined by a cylinder 7, an upper lid 8 and a lower lid 9, and a blade is provided on the outer peripheral surface of the rolling piston 6.
By bringing the tips of the blades 10 into contact, the suction chamber 13 is limited on one side of the blade 10 and the compression chamber 14 is limited on the other side.

[0005] An upper bearing 38 is attached to the upper lid 8.
A lower bearing 39 is attached to the lower lid 9, and the rotating shaft 4 is rotatably supported by the upper bearing 38 and the lower bearing 39.

As clearly shown in FIGS. 5 and 6, the upper bearing
The lower end 38 is press-fitted and fixed in the shaft hole 50 of the upper lid 8 so that the lower end thereof is located slightly (2 to 4 mm) above the lower surface of the upper lid 8. An annular space 43 is formed which is surrounded by the peripheral surface and the upper surface of the shoulder 42 above the crank 5. In this space 43, an oil hole 44 communicating with the oil supply passage 19 formed in the rotating shaft 4 is opened, and a lower end of a threaded groove 45 formed in the outer peripheral surface of the rotating shaft 4 is opened.

Similarly, the lower bearing 39 is press-fitted and fixed so that the upper end thereof is located slightly (2 to 4 mm) below the upper surface of the lower cover 9, whereby the upper end surface of the lower bearing 39 and the inside of the shaft hole are formed. An annular space 47 is formed which is surrounded by the peripheral surface and the lower end surface of the shoulder 46 below the crank 5.

A concave portion 41 is formed on the outer peripheral surface of the crank 5, and the concave portion 40 communicates with the oil supply passage 19 through an oil hole 40. In addition, in FIG. 3, 32 is a balance weight,
Rolling piston 6 attached to both ends of rotor 2b
Vibration due to the unbalanced weight of the crankshaft 5 and the like.

When the rotating shaft 4 is driven to rotate by the motor 2, the rolling piston 6 fitted to the crank 5 rotates eccentrically in the direction of the arrow in the cylinder chamber 12 and accordingly sucks into the suction chamber 13. Gas is sucked in from the pipe 20 and
The gas in 14 is compressed.

The compressed gas enters the discharge muffler chambers 27 and 28 through the discharge port 33, and after its pulsation component is removed, passes through a hole (not shown) to the expansion chamber 35 limited below the motor 2. The pulsating component is further removed by entering and expanding.

Next, a gap 29 between the stator 2a and the rotor 2b is set.
And the pulsation component is further removed by expanding into the expansion chamber 15 limited above the motor 2 through the gap 30 between the stator 2a and the housing 1 to further remove the pulsating component.
It is discharged from 16 to the outside.

An oil sump 17 formed at the inner bottom of the housing 1
The oil stored inside is pumped up by an oil pump 18 composed of a spider or the like incorporated in the lower part of the rotating shaft 4,
Part of the oil is supplied to a gap between the rotating shaft 4 and the lower bearing 39 via the oil supply passage 19.

The other part enters the recess 40 through the oil hole 40, enters into the gap between the outer peripheral surface of the crank 5 and the inner peripheral surface of the rolling piston 6 and lubricates them. The lubricant enters the gap between the end face and the lower end face of the upper lid 8 and the gap between the lower end face of the rolling piston 6 and the upper end face of the lower lid 9 to lubricate them.

Further, the other part enters the cavity 43 through the oil hole 44, and from there enters into the gap between the outer peripheral surface of the rotating shaft 4 and the inner peripheral surface of the upper bearing 38 through the spiral groove 45, and these are removed. After lubrication, it flows out of the upper end of the upper bearing 38 into the housing 1.

[0015]

When the conventional compressor is stopped for a long time, the refrigerant sealed in the refrigerant circuit of the air conditioner liquefies and accumulates in the oil reservoir 17 at the bottom inside the housing 1. When the compressor is started in this state, the liquid refrigerant is pumped together with the oil by the oil pump 18 and supplied to the inner peripheral surface of the rolling piston 6 through the oil supply passage 19, the oil hole 40, and the concave portion 41, where the liquid refrigerant is supplied. Gasifies. Then
Since the gas refrigerant does not easily escape, a sufficient amount of oil cannot be supplied thereafter, and there is a possibility that poor lubrication or seizure may occur.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is to provide a motor and a motor which are driven through a rotary shaft in a sealed housing. A rolling piston fitted with a crank of the rotating shaft;
A cylinder accommodating the rolling piston, upper and lower lids attached to both ends of the cylinder to limit a cylinder chamber, and an upper bearing attached to the upper and lower lids to rotatably support the rotating shaft. And a lower bearing, and a blade for partitioning the cylinder chamber into a suction chamber and a compression chamber, and oil pumped by an oil pump provided at a lower end portion of the rotary shaft is bored in the rotary shaft. In a hermetic rolling piston type compressor that refuels a gap between the rolling piston and the crank via an oil supply passage, a gap between the rolling piston and the upper lid and the lower lid, and a gap between the rotating shaft and the upper bearing and the lower bearing, At least a corner at the upper end of the inner peripheral surface of the rolling piston is tapered to form a groove passage. In sealed rolling piston type compressor, characterized in that the formation of the oil passage leading to the oil supply path to the gap between the rotating shaft and the upper bearing from the inner circumference side of the rolling piston through.

The gist of the second invention is that a motor and a rolling piston type compression mechanism driven by the motor via a rotary shaft are built in a sealed housing, and the rolling piston type compression mechanism is mounted on the rotary shaft. A rolling piston fitted to the crank, a cylinder accommodating the rolling piston, an upper lid and a lower lid attached to both ends of the cylinder to limit the cylinder chamber, and attached to the upper lid and the lower lid. An upper and lower bearings rotatably supporting the rotary shaft, and blades for partitioning the cylinder chamber into a suction chamber and a compression chamber, and were pumped by an oil pump provided at a lower end of the rotary shaft. The oil passes through a lubrication passage formed in the rotating shaft, a gap between the rolling piston and the crank, In a hermetic rolling piston type compressor for supplying oil to a gap between a ring piston and an upper lid and a lower lid, and a gap between the rotating shaft and the upper bearing and the lower bearing, an end face of the upper lid sliding on the rolling piston. At least one groove passage is formed at a corner of the shaft hole and the shaft hole, and the oil from the inner peripheral side of the rolling piston to an oil supply path to a gap between the rotation shaft and the upper bearing through the groove passage. A hermetic rolling piston type compressor having a passage formed therein.

Another feature is that the groove passage is formed so as to be always positioned inside the outer diameter of the rolling piston and at all intervals on the rotation axis center at equal intervals. is there.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. A groove passage 47 is formed by tapering a corner at the upper end of the inner peripheral surface of the rolling piston 6. Note that a similar groove passage 48 may be formed at a corner at the lower end side of the inner peripheral surface of the rolling piston 6. The other configuration is the same as that of the conventional one shown in FIGS. 3 to 6, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, when the compressor is started after being stopped for a long time, the oil and the liquid refrigerant pumped from the oil sump 17 pass through the oil supply passage 19, the oil hole 40, and the concave portion 41 to reach the inner peripheral surface of the rolling piston 6. The liquid refrigerant enters the gap with the outer peripheral surface of the crank 5 and evaporates by foaming here.

The gas refrigerant enters the cavity 43 through the groove passage 47, is discharged from the upper end thereof through the oil hole 44 and the oil supply passage 19, and simultaneously passes through the spiral groove 45 from the upper end of the upper bearing 38. It is discharged into the housing 1. Thereafter, since the oil flows through the same path as described above, the inner peripheral surface and the upper and lower end surfaces of the rolling piston 6 can be sufficiently lubricated with the oil.

A second embodiment of the present invention is shown in FIG.
(A) is a partial vertical cross-sectional view, and (B) is an arrow view along BB arrow of (A). In the second embodiment, the upper lid 8
The lower end surface of the rolling piston 6, that is, the lower surface that slides on the upper end surface of the rolling piston 6, and the corners of the shaft hole 50, which are arranged at equal intervals with respect to the center of the rotating shaft 4 so as to be located on all sides. Groove passage 49 is formed. Another configuration is the first configuration shown in FIG.
The same reference numerals are given to corresponding members, and description thereof will be omitted.

The gas refrigerant evaporated on the inner peripheral side of the rolling piston 6 passes through the groove passage 47 and the groove passage 49 to form an empty space.
43, and is discharged therefrom through an oil hole 44 and a spiral groove 45. As shown in FIG. 2 (B), the groove passage 49 does not exceed the outer diameter of the rolling piston 6 and does not protrude to the outside. Does not leak to

Since any one of the groove passages 49 is opened on the inner peripheral side of the rolling piston 6, the gas refrigerant can be reliably discharged through the groove passages 49.

Although the four groove passages 49 are provided in the second embodiment, it is sufficient to provide at least one groove passage 49, and the groove passage 47 is provided in addition to the groove passage 49. Only the groove passage 49 can be provided. However, if the groove passage 47 is provided in addition to the groove passage 49, the gas refrigerant can easily escape.

[0026]

According to the first aspect of the present invention,
Since the groove passage was formed by tapering at least the upper corner of the inner peripheral surface of the rolling piston, the gas refrigerant evaporated on the inner peripheral side of the rolling piston was discharged when the compressor was started after being stopped for a long time. Since the oil can be discharged via the oil supply path to the gap between the rotating shaft and the upper bearing through the groove passage, poor lubrication and seizure of the inner peripheral surface of the rolling piston and the upper and lower end surfaces thereof can be prevented.

According to the second aspect of the present invention, at least one or more groove passages are formed at the corners of the shaft hole and the end face of the upper lid that slides with the rolling piston. When started after stopping for a period, the gas refrigerant evaporated on the inner peripheral side of the rolling piston can be discharged through the groove passage through an oil supply path to a gap between the rotating shaft and the upper bearing, so that the inner peripheral surface of the rolling piston In addition, poor lubrication and seizure of the upper and lower end surfaces thereof can be prevented.

If the groove passage is always formed inside the outer diameter of the rolling piston and at four sides at equal intervals with respect to the center of the rotating shaft, oil flows through the groove passage to the outer peripheral side of the rolling piston. The gas refrigerant on the inner peripheral side of the rolling piston can be reliably discharged through the groove passage.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view showing a first embodiment of the present invention.

FIGS. 2A and 2B show a second embodiment of the present invention, wherein FIG. 2A is a partially enlarged longitudinal sectional view, and FIG. 2B is a view along arrow BB in FIG.

FIG. 3 is a longitudinal sectional view of a conventional hermetic rolling piston type compressor.

FIG. 4 is a transverse sectional view taken along the line BB of FIG. 3;

FIG. 5 is a partially enlarged longitudinal sectional view of a conventional hermetic rolling piston type compressor.

FIG. 6 is a sectional view taken along the line BB of FIG. 5;

[Explanation of symbols]

 4 Rotary shaft 5 Crank 42 Shoulder 6 Rolling piston 7 Cylinder 12 Cylinder chamber 8 Upper lid 38 Upper bearing 9 Lower lid 39 Lower bearing 19 Oil supply passage 40, 44 Oil hole 43 Empty 45 Spiral groove 47 Groove passage

Claims (3)

[Claims] 1. A rolling piston, wherein a motor and a rolling piston type compression mechanism driven by the motor via a rotary shaft are incorporated in a sealed housing, and the rolling piston type compression mechanism is fitted on a crank of the rotary shaft. And a cylinder accommodating the rolling piston,
An upper lid and a lower lid attached to both ends of the cylinder to limit the cylinder chamber; an upper bearing and a lower bearing attached to the upper lid and the lower lid to rotatably support the rotating shaft; and The rolling piston and the crank are constituted by a blade for partitioning into a suction chamber and a compression chamber, and the oil pumped up by an oil pump provided at the lower end of the rotary shaft is passed through an oil supply passage formed in the rotary shaft. A gap between the rolling piston, the upper lid and the lower lid, and a gap between the rotating shaft and the upper bearing and the lower bearing. In the hermetic rolling piston type compressor, at least the inner peripheral surface of the rolling piston The upper corner is tapered to form a groove passage, and from the inner peripheral side of the rolling piston through this groove passage. A sealed rolling piston type compressor, wherein an oil passage leading to an oil supply path to a gap between the rotating shaft and the upper bearing is formed. 2. A rolling piston in which a motor and a rolling piston type compression mechanism driven by the motor via a rotating shaft are incorporated in a sealed housing, and the rolling piston type compression mechanism is fitted to a crank of the rotating shaft. And a cylinder accommodating the rolling piston,
An upper lid and a lower lid attached to both ends of the cylinder to limit the cylinder chamber; an upper bearing and a lower bearing attached to the upper lid and the lower lid to rotatably support the rotating shaft; and The rolling piston and the crank are constituted by a blade for partitioning into a suction chamber and a compression chamber, and the oil pumped up by an oil pump provided at the lower end of the rotary shaft is passed through an oil supply passage formed in the rotary shaft. In the hermetic rolling piston type compressor that supplies oil to the gap between the rolling piston, the upper lid and the lower lid, and the gap between the rotating shaft and the upper and lower bearings. At least one groove passage is formed at a corner between the end face on the moving side and the shaft hole, and the rolling is performed through the groove passage. A sealed rolling piston type compressor, wherein an oil passage is formed from an inner peripheral side of a piston to an oil supply path to a gap between the rotating shaft and the upper bearing. 3. The rolling device according to claim 2, wherein the groove passage is always located inside the outer diameter of the rolling piston and is equally spaced from the center of the rotation shaft. A sealed rolling piston type compressor as described.