JPH1182343A - Rolling piston type rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a sliding speed between a roller of a rolling piston type rotary compressor and a point of a blade. SOLUTION: This rolling piston type rotary compressor comprises an autorotation blocking means 88 for revolving an inside roller 10a to be armored on a crank part 7 of a driving shaft, and a blade 14 which comes in and out to a cylinder so that a point thereof is slided and kept into slide contact with an outer peripheral face of an outside roller 10b to be armored on the inside roller 10a, for partitioning a compression chamber 26. Whereby the outside roller 10b receives the contact resistance with the point of the blade while revolving, and generates the revolving slide to the inside roller 10a, and further it generates the revolving slide of a low speed to the point of the blade 14, whereby the abrasion of the outside roller 10b and the point of the blade 14 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the durability of a rotary compressor.

[0002]

2. Description of the Related Art The structure of a rolling piston type rotary compressor, which is widely used in compressors for air conditioners, is well known as represented by a vertical section shown in FIG. 9 and a horizontal section shown in FIG. ing.

That is, an electric motor 102 and a compression unit 103 driven by the electric motor 102 are provided inside a closed container 101.
The drive shaft 106 of the compression unit 103 is connected to the electric motor 102 and supported by main bearings 108 and sub-bearings 109 arranged on both sides of the cylinder block 111.

[0004] Inside a cylinder block 111 having a cylinder 119, a roller 110 for covering a crank portion 107 eccentric from the main shaft of the drive shaft 106 is provided with a cylinder 110.
9 and is formed close to the inner wall of the diaper 9 to form a compression chamber 115.

The guide groove 112 of the cylinder block 111 has a blade 114 and the tip of the blade 114
A spring device 113 for urging the compression chamber 10 is disposed, and the compression chamber 115 is partitioned into a suction side and a compression side.

[0006] The blade 1 is mounted on the cylinder block 111.
Suction port 116 opening to cylinder 119 at the boundary of 14
And a discharge port 117 are provided.

[0007] The suction port 116 is connected to an accumulator 160 for storing the low-pressure side refrigerant.

The rotation of the rotor 105 of the electric motor 102 rotates the crank 107 of the drive shaft 106, and the roller 110 tries to follow the rotation of the crank 107 at the same speed. It rotates in a state in which relative movement has occurred between the roller 110 and the crank part 107 due to frictional resistance. As a result, the relative speed between the roller 110 and the tip of the blade 114 also decreases,
The durability of the tips of the roller 110 and the blade 114 is ensured (JP-A-63-208688).

On the other hand, a configuration for further reducing the relative speed between the roller and the tip of the blade has been proposed in Japanese Patent Application Laid-Open No. Hei 9-137784, as shown in FIGS.

That is, FIG. 11 is a longitudinal sectional view of a rotary compressor, FIG. 12 is a transverse sectional view of a compressor, FIG. 13 is an exploded perspective view of a main part of the compressor, and FIG. In the state of (top dead center), the blade 207 is in the most retracted state with respect to the compression chamber.

In this configuration, a guide groove 219 is provided on an end face of a main bearing 209 supporting a drive shaft 205, and a guide groove 220 is provided on an end face of a roller 206 facing the guide shaft 209, and reciprocates in these guide grooves 219 and 220. An Oldham's joint 218, which is freely fitted and whose reciprocating surfaces are orthogonal to each other, allows the roller 206 to rotate without rotating, thereby increasing the relative speed between the roller 206 and the tip of the blade 207. Very low.

[0012]

However, in the former configuration, the sliding speed between the roller 206 and the tip of the blade 207 during the high-speed operation of the compressor increases,
There was a problem of abrasion progressing.

In the latter configuration, the blade 2
07, the contact portion of the roller 206 is limited to a narrow range, local wear of the outer peripheral portion of the roller 206 progresses,
There was a problem that durability was impaired and compression efficiency was reduced.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem, in which the roller is rotated at a moderately low speed and the sliding speed between the blade is extremely reduced to improve the durability of the roller and the blade. It is intended to aim at.

Another object of the present invention is to simplify the rotation preventing mechanism and improve the airtightness of the compression chamber.

Another object of the present invention is to simply form a lubrication passage which can simultaneously lubricate the sliding surfaces of the inner roller and the outer roller.

Another object of the present invention is to provide a lubrication passage in which the lubrication of each component does not become excessive or insufficient.

Another object of the present invention is to simply form a lubricating oil passage. Another object of the present invention is to form a passage through which lubricating oil can be stored.

Another object of the present invention is to improve the oil film sealing action on both end surfaces of the outer roller.

Another object of the present invention is to reduce lubricating oil passage resistance.

[0021]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to prevent rotation of an inner roller provided on a crank portion, and contact an outer roller provided on the inner roller with a tip of a blade. This significantly reduces the rotation of the outer roller.

By disposing the inner roller and the outer roller, the sliding speed between the tip of the blade and the outer roller can be drastically reduced, and the durability can be improved and the compression efficiency can be prevented from lowering.

Further, the present invention reduces the outer diameter of the inner roller and increases the radial seal length of the end face of the outer roller.

The arrangement of the inner roller and the outer roller improves the airtightness between the compression chamber and the inner side of the outer roller without increasing the outer diameter of the compressor.

Further, the present invention forms a lubricating passage through which the lubricating oil supplied inside the inner roller can lubricate the outer side of the inner roller.

The outer roller is also lubricated by the formation of the lubricating passage. In the present invention, the storage chamber of the rotation preventing member is configured as a part of the lubricating oil passage.

With the arrangement of the storage chamber, the rotation preventing member is also lubricated at the same time. According to the present invention, a lubricating passage is formed outside the inner roller.

According to the above configuration, a lubricating passage can be easily formed in the thin inner roller. Further, the present invention provides a large storage chamber for the rotation preventing member.

With the above configuration, lubrication immediately after the start of the compressor can be performed smoothly. Further, in the present invention, another oil passage which directly communicates between annular concave portions provided on each end face of the outer roller is provided.

With the above configuration, the lubricating oil is evenly stored in the two annular concave portions. Further, the present invention reduces the number of detour paths of the lubricating oil passage.

With the above configuration, the lubricating oil supply amount is increased.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 does not rotate a cylinder having a cylindrical inner surface provided on a cylinder block of a compression section and an inner roller which is mounted on a crank section of a drive shaft connected to an electric motor. An outer roller that moves along the inner surface of the cylinder and is external to the inner roller, and an outer periphery of the outer roller, in which the rotation preventing member is locked between a stationary member fastened to the cylinder block and the inner roller so that the inner roller rotates. A blade is provided to protrude and retract from the cylinder block into the cylinder so that the leading end slides on the surface, and partitions a compression chamber formed by the inner surface of the cylinder and the outer peripheral surface of the outer roller. According to this configuration, the outer roller on which the gas pressure of the compression chamber acts is rotated by following the inner roller while being supported by the inner roller. In addition to the rotational sliding action, a rotational sliding action also occurs between the blade tip. The sliding speed generated on the inner peripheral surface and the outer peripheral surface of the outer roller is extremely lower than the sliding speed between the crank portion and the inner roller, so that the wear of the blade tip and the outer roller can be reduced.

According to the second aspect of the present invention, the planes parallel to each other are provided on the outer periphery of the end of the inner roller, and the rotation preventing member has a through hole having two planes fitted into the planes. An annular plate disposed at a central portion, and two key portions orthogonal to two plane portions on one surface of the annular plate.
One key portion is locked to a stationary member. According to this configuration, the rotation preventing mechanism can be simply configured, and the rotation preventing mechanism can be provided by reducing the outer diameter of the inner roller. As a result, the thickness of the outer roller in the radial direction can be increased, and fluid leakage from the inside of the outer roller to the compression chamber can be reduced.

According to a third aspect of the present invention, an oil passage is provided on a sliding contact surface between an inner roller and an outer roller, while annular concave portions are provided on both end surfaces of the outer roller, respectively, so that the oil passage is annularly concave. And an oil supply passage which sequentially passes from the inside of the inner roller to one of the annular recessed portions, the oil passage, the other annular recessed portion, and the electric motor chamber for housing the electric motor. According to this configuration, a passage through which the lubricating oil supplied to the inside of the inner roller is also provided for lubrication of the outer roller is simply formed, and durability can be easily ensured.

According to a fourth aspect of the present invention, the storage chamber in which the rotation preventing member is disposed is disposed in the middle of the oil supply passage. According to this configuration, the lubricating oil supplied to the inside of the inner roller is provided to one system of other component lubrication, and lubrication without excess or deficiency becomes possible.

According to a fifth aspect of the present invention, an oil passage is formed by cutting a part of the outer peripheral surface of the inner roller into a cut plane shape. According to this configuration, the oil passage can be easily formed.

According to a sixth aspect of the present invention, one of the main bearing disposed on the side of the motor to support the drive shaft and the sub-bearing disposed on the opposite side of the motor is a stationary member. In order to partition between the storage chamber provided in the above and the end face of the outer roller, an intermediate partition plate is arranged. According to this configuration, the degree of freedom in selecting the size of the storage chamber is increased, and it becomes easy to store the lubricating oil in the storage chamber.

According to a seventh aspect of the present invention, at least one pair of oil holes communicating with the annular concave portion is symmetrically arranged on the outer roller. According to this configuration, the lubricant distribution inside the outer roller becomes uniform. As a result, the oil film sealing action on both end surfaces of the outer roller becomes uniform.

According to an eighth aspect of the present invention, the cut flat portion provided on the outer peripheral portion of the end of the inner roller and the flat portion provided on the outer peripheral surface of the inner roller to form the oil passage are substantially parallel to each other. It is arranged. According to this configuration, the lubricating oil path is shortened, and the lubricating oil passage resistance can be reduced.

[0040]

Embodiments of the present invention will be described below with reference to the drawings.

(Example 1) FIG. 1 shows a partial longitudinal section of a rolling piston type rotary refrigerant compressor, FIG. 2 shows a transverse section taken along line AA of FIG. The compressor 2 is disposed at a lower portion of the motor 2, and a discharge pipe (not shown) connected to an external piping system of the compressor is connected to an upper space (not shown) of the motor 2. A suction pipe 51 communicating with the suction side of the compression unit 3 is connected to a side portion of the closed container 1.

The compression section 3 has a main bearing 8 and a sub-bearing 9 which are internally fixed to the closed casing 1 and are fixed with a cylinder block 11 and a partitioning intermediate plate interposed therebetween.

A drive shaft 6 connected to a rotor 5 of the electric motor 2 is supported by a main bearing 8 and a sub-bearing 9, and an inner roller 10 a having an external appearance shown in FIG. I have.

An outer roller 10b having the outer shape shown in FIG. 6 is provided outside the inner roller 10a.

As shown in FIG. 2, a blade 14 is mounted in a guide groove 12 provided in a cylinder block 11, and the tip of the blade 14 is
Is pressed against.

The compression chamber 2 partitioned by the blade 14
A suction port 28 opening to the cylinder 6 is provided on the cylinder block 11, and a discharge port 29 is provided on the side of the cylinder block 11 on which the auxiliary bearing 9 is mounted.

Discharge valve device (not shown) and discharge cover 63
Are disposed in the auxiliary bearing 9, and the refrigerant gas discharged from the compression chamber 26 communicates with the motor chamber 70 that houses the motor 2 through the communication passage 86.

The upper space (not shown) of the motor room 70 in which the motor 2 is housed communicates with the lower space 70a through a cooling passage 71 provided outside the stator 4 of the motor 2.

The oil reservoir 35 is a lower space 70a of the motor room 70.
Leads to. As shown in FIG. 5, two parallel planes 10ab are provided on the brim portion 10aa of the inner roller 10a, and a cut plane 10ac parallel to the plane 10ab is provided on a part of the outer peripheral surface provided in the outer roller 10b. Have been. A cutout groove 10ad is provided on the lower end surface of the inner roller 10a.

The outer roller 10b is provided with annular recessed grooves 10ba at both ends thereof, and a plurality of oil holes 10bb communicating between the annular recessed grooves 10ba are arranged at symmetrical positions.

A rotation preventing member 88 arranged in a storage chamber 89 provided between the main bearing 8 and the partitioning intermediate plate 92 and for imparting a turning motion to the inner roller 10a is shown in FIG. As shown, the brim portion 10 of the inner roller 10a
A pair of keys engaged with the key groove 87 on one surface of an annular plate 88a having an arc shape and a linear shape engaged with the two flat portions 10ab of the aa and the key groove 87 provided in the main bearing 8. A portion 88b is provided.

At the center of the annular plate 88a, a through hole 88d having a plane portion 88c parallel to each other is provided.
The flat portion 88e and the flat portion 88c of the key portion 88b are orthogonal to each other.

As shown in FIG. 4, the rotation preventing members 88 are attached to the two flat portions 10ab of the brim portion 10aa of the inner roller 10a.
Are arranged so as to be able to reciprocate between the two flat portions.

The storage room 89 for the rotation preventing member communicates with the motor room 70 through a first hole 90 provided in the main bearing 8.

The oil reservoir 35 communicates with the motor chamber 70 through a second hole 91 provided in the main bearing 8.

The operation of the rolling piston type rotary refrigerant compressor configured as described above will be described.

Drive shaft 6 connected to rotor 5 of electric motor 6
As the roller rotates, the inner roller 10a exteriorly mounted on the crank portion 7 attempts to rotate, but is locked to the main bearing 8 via the rotation preventing member, so that only the turning motion of the drive shaft 6 around the main shaft is performed. I do.

Outer roller 1 exterior to inner roller 10a
0b also follows and makes a turning motion. As a result, blade 1
The suction / compression operation is performed in the compression chamber 26 partitioned by 4.

The suction gas introduced from the suction pipe 51 to the suction side of the compression chamber 26 is compressed, and is discharged to a discharge valve device (not shown).
It is discharged to the motor room 70 through the communication passage 88.

A part of the lubricating oil contained in the refrigerant gas is separated and returned to the oil reservoir 35, and the remaining lubricating oil is sent out of the compressor together with the refrigerant gas through a discharge pipe (not shown).

Next, regarding the movement of the outer roller 10b,
This will be described with reference to FIG. While the tip of the blade 14 urged by the combined force P of the lubricating oil to which the discharge pressure acts and the spring device 13 contacts the outer roller 10b, the compression chamber 2
The compressed refrigerant gas pressure load of No. 6 acts on the inner roller 10a via the outer roller 10b.

In order to reduce the friction loss generated at the tip of the blade 14, the magnitude of the resultant force P is limited.
Most of the pressure during the compression stroke is (P << the pressure load of the compressed refrigerant gas in the compression chamber 26).

Therefore, the magnitude of the frictional resistance R1 generated between the outer roller 10b and the inner roller 10a is R1 >> R2 with respect to the frictional resistance R2 generated between the tip of the blade 14 and the outer roller 10b. ing.

As a result, as long as the diameter of the outer roller 10b is not excessively large with respect to the diameter of the inner roller 10a, the inertial force and R1 based on the turning motion of the outer roller 10b >>
R2, the tip of the blade 14 and the outer roller 10
b and a relative motion occurs. That is, the outer roller 1
0b also rotates at an extremely low speed while turning.

The rotation speed of the outer roller 10b is
It changes depending on the rotation angle of. Since the suction stroke is completed at the position of the top dead center of the blade 14, the compressed refrigerant gas pressure load in the compression chamber 26 does not act, and the rotation speed of the outer roller 10b may be stopped instantaneously.

As described above, the rotation speed of the outer roller 10b constantly fluctuates. Next, the flow of the lubricating oil will be described.

The lubricating oil sent to the cutout groove 10ad of the inner roller 10a by the pump means 93 provided at the lower end of the drive shaft 6 is supplied to the oil of the annular concave groove 10ba at the lower end of the outer roller 10b and the outer roller 10b. The fluid flows into the motor chamber 70 through the hole 10bb, the annular groove 10ba at the lower end of the outer roller 10b, the storage chamber 89 provided in the main bearing 8, and the first hole 90.

The lubricating oil passes through the oil passage 94 (see FIG. 2) formed between the inner diameter surface of the outer roller 10b and the cut plane 10ac of the inner roller 10a in parallel with the oil hole 10bb.

The lubricating oil staying in the annular recessed groove 10ba of the outer roller 10b slightly flows into the compression chamber 26 through the end surface sliding contact gap of the outer roller 10b.

The sliding contact portion of the rotation preventing member 88 is
Is lubricated by the lubricating oil passing through.

As described above, according to the above embodiment, the cylinder having the cylindrical inner surface provided in the cylinder block 11 of the compression section 3 and the crank section 7 of the drive shaft 6 connected to the electric motor 2 are provided.
In order to make the inner roller 10a, which is exteriorly mounted on the inner roller 10a, rotate without rotating, the rotation preventing member 88 is locked between the main bearing 8 fastened to the cylinder block 11 and the inner roller 10a, and moves along the inner surface of the cylinder. And inner roller 1
0a, an outer roller 10b and an outer roller 10b.
And a blade 14 that comes into and out of the cylinder from the cylinder block 11 to partition the compression chamber 26 formed by the inner surface of the cylinder and the outer surface of the outer roller 10b so that the leading end slides on the outer peripheral surface of the compression chamber. While the outer roller 10b on which the compressed refrigerant pressure of 26 acts is rotated by following the inner roller 10a while being supported by the inner roller 10a, the inner roller 10b receives the contact resistance with the tip of the blade 14 and
a and a rotary sliding action occurs between the
A rotational sliding action also occurs between the tip and the tip. Outer roller 1
The sliding speed generated on the inner peripheral surface and the outer peripheral surface of Ob
Is extremely smaller than the sliding speed between the inner roller 10a and the outer roller 10b.
Wear can be reduced.

According to the above embodiment, the inner roller 10
The cut flat portions 10ac parallel to each other are provided on the outer peripheral portion of the end portion a.
An annular plate 88a having a through hole 88d having two flat portions 88c at the approximate center thereof, and an annular plate 8
8a has two key portions 88b having a sliding portion orthogonal to the two flat portions 88c on one surface thereof, and the two key portions 88b are locked in the key grooves 87 of the main bearing 8 so that they rotate. The blocking mechanism can be simply configured, and the rotation preventing mechanism can be provided by reducing the outer diameter of the inner roller 10a. As a result, the thickness of the outer roller 10b in the radial direction is increased to improve the sliding sealing property at the gap between both end faces, the lubricating oil flow from the inside of the outer roller 10b into the compression chamber 26 is reduced, and the oil compression loss is reduced. Can be reduced.

According to the above embodiment, the inner roller 10
While the oil passage 94 is provided on the sliding contact surface between the outer roller 10b and the outer roller 10b, the annular recessed portions 10ba are respectively provided on both end surfaces of the outer roller 10b, and the oil passage 94 is opened to the annular recessed portion 10ba. From the inside of the inner roller 10a, one annular concave portion 10ba, the oil passage 94, and the other annular concave portion 1
Oba, the oil supply passage sequentially passing through the motor room 70 accommodating the electric motor 2 is provided, so that a passage in which the lubricating oil supplied inside the inner roller 10a is also provided for lubrication of the outer roller 10b is easily formed. The durability of the outer roller 10b can be easily improved.

According to the above embodiment, the rotation preventing member 8
By arranging the storage chamber 89 for disposing 8 in the middle of the oil supply passage, the lubricating oil supplied to the inside of the inner roller 10a can be provided for lubrication of other components of one system, so that the oil supply amount increases. Durability can be improved.

According to the above embodiment, the inner roller 10
Since the oil passage is formed in the shape of a part of the cut plane 10ac on the outer peripheral surface of a, the oil passage can be simply configured to reduce the cost.

According to the above-described embodiment, a partition is formed between the storage chamber 89 of the rotation preventing member 88 provided on the main bearing 8 disposed on the side of the electric motor 2 to support the drive shaft 6 and the end face of the outer roller 10b. Therefore, by arranging the partition middle plate 92, the degree of freedom in selecting the size of the storage room 89 is increased.
A required amount of lubricating oil can be stored in the storage chamber 89, and the lubricating oil can be easily supplied to the sliding contact portion between the main bearing 8 and the rotation preventing member 88 at the initial stage of starting the compressor, so that the durability can be improved.

According to the above embodiment, the annular recess 10
a plurality of pairs of oil holes 10bb communicating with the outer rollers 10bb.
The lubrication oil distribution inside the outer roller 10b can be made uniform by symmetrically arranging the outer roller 10b. As a result, the outer roller 1
The oil film sealing action of the sliding contact surfaces at both ends of Ob becomes uniform, and the sealing effect is improved, so that the compression efficiency can be improved.

(Embodiment 2) FIG. 8 shows an inner roller 10a1.
And a flat surface 10ac1 at the upper end on the same side.
ab1, the rotation preventing member is provided on the plane 10ab1.
Can be slid in contact with According to this configuration, the oil passage of the lubricating oil is simple and short, and the resistance of the lubricating oil passage is reduced, so that the amount of lubricating oil increases and the durability can be improved.

In the above embodiment, the refrigerant compressor has been described. However, a gas compressor for compressing another gas (for example, oxygen, nitrogen, helium, air, etc.) produces the same operation and effect. is there.

[0080]

As is apparent from the above embodiment, the first aspect of the present invention is as follows.
According to the invention described in the above, the cylinder having a cylindrical inner surface provided in the cylinder block of the compression unit and the inner roller exteriorly mounted on the crank part of the drive shaft connected to the electric motor are fastened to the cylinder block so as to rotate without rotating. A rotation preventing member is locked between the stationary member and the inner roller, and the outer roller moves along the inner surface of the cylinder and is externally mounted on the inner roller. And a blade partitioning into and out of the cylinder to partition a compression chamber formed by the inner surface of the cylinder and the outer peripheral surface of the outer roller. According to this configuration, the outer roller on which the gas pressure of the compression chamber acts is the inner roller. While rotating by following the inner roller while being supported by the roller, it receives the contact resistance with the blade tip and produces a rotational sliding action between the inner roller and Causing rotary slide also acts between the blade tips. The sliding speed generated on the inner peripheral surface and the outer peripheral surface of the outer roller is extremely lower than the sliding speed between the crank portion and the inner roller, so that the wear of the blade tip and the outer roller can be reduced.

According to the second aspect of the present invention, while parallel cut plane portions are provided on the outer peripheral portion of the end portion of the inner roller, the rotation preventing member has a through hole having two flat portions fitted into the flat portions. It consists of an annular plate arranged approximately in the center and two key portions on one surface of the annular plate, which are orthogonal to two plane portions. The two key portions are locked to a stationary member. According to this, the anti-rotation mechanism is simply configured,
The rotation preventing mechanism can be provided by reducing the outer diameter of the inner roller. As a result, the thickness of the outer roller in the radial direction is increased, and the leakage of fluid from the inside of the outer roller to the compression chamber is reduced, so that the compression efficiency can be improved.

According to a third aspect of the present invention, an oil passage is provided on a sliding contact surface between an inner roller and an outer roller, while annular concave portions are provided on both end surfaces of the outer roller, and the oil passage is formed in an annular concave shape. And an oil supply passage which sequentially passes from the inside of the inner roller to one of the annular recessed portions, the oil passage, the other annular recessed portion, and the motor chamber for housing the motor. According to this, a passage through which the lubricating oil supplied to the inside of the inner roller is also provided for lubrication of the outer roller is simply formed, and durability can be easily ensured.

According to a fourth aspect of the present invention, the storage chamber in which the rotation preventing member is disposed is disposed in the middle of the oil supply passage. According to this configuration, the lubricating oil supplied to the inside of the inner roller is removed. Provided for lubrication of other components in the system, lubrication without excess and deficiency is possible, and durability can be improved.

According to the fifth aspect of the present invention, the oil passage is formed by cutting a part of the outer peripheral surface of the inner roller into a cut plane shape. According to this configuration, the oil passage can be easily formed, and the cost can be reduced. Can be.

According to a sixth aspect of the present invention, one of the main bearing disposed on the side of the motor to support the drive shaft and the sub-bearing disposed on the opposite side of the motor is a stationary member. In this configuration, a partitioning intermediate plate is arranged to partition between the storage chamber provided in the above and the end surface of the outer roller. According to this configuration, the degree of freedom in selecting the size of the storage chamber is increased. Lubricating oil can be easily stored in the storage chamber, and the durability of the rotation preventing member at the initial stage of starting the compressor can be improved.

According to a seventh aspect of the present invention, at least one pair of oil holes communicating with the annular concave portion is symmetrically arranged on the outer roller. According to this configuration, the distribution of the lubricating oil inside the outer roller is uniform. become. As a result, the oil film sealing action on both end surfaces of the outer roller becomes uniform, and the leakage of liquid from the inside of the outer roller to the compression chamber can be reduced, and the compression efficiency can be improved.

According to an eighth aspect of the present invention, a flat portion provided on an outer peripheral portion of an end portion of an inner roller and a cut planar shape portion provided on an outer peripheral surface of an inner roller to form an oil passage are substantially parallel to each other. According to this configuration, the lubricating oil path can be shortened, the lubricating oil passage resistance can be reduced, and the amount of lubricating oil can be increased to improve the durability.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a rolling piston type rotary refrigerant compressor showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA in FIG.

FIG. 3 is an external view of a rotation preventing member of the compressor.

FIG. 4 is an explanatory view showing a meshing state between the rotation preventing member and an inner roller.

FIG. 5 is an external view of the inner roller.

FIG. 6 is an external view of the outer roller.

FIG. 7 is a diagram for explaining the movement of the inner roller and the outer roller.

FIG. 8 is an external view of an inner roller according to another embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a conventional rolling piston type rotary compressor.

FIG. 10 is a cross-sectional view of a compression section of the compressor.

FIG. 11 is a longitudinal sectional view of another conventional rolling piston type rotary compressor.

FIG. 12 is a cross-sectional view of a compression section of the compressor.

FIG. 13 is an explanatory view of main parts assembly of the compressor.

FIG. 14 is a layout view of a rotation preventing member of the compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor 3 Compression part 6 Drive shaft 7 Crank part 8 Main bearing 9 Secondary bearing 10a Inner roller 10ab Plane 10ac Cut plane 10b Outer roller 10ba Annular groove 10bb Oil hole 11 Cylinder block 14 Blade 26 Compression chamber 70 Motor chamber 88 anti-rotation member 88a annular plate 88b key portion 88c flat portion 88d through hole 89 storage chamber 92 partitioning plate 94 oil passage

Claims (8)

[Claims] An electric motor and a compression section are arranged in a sealed container in which a discharge pressure acts, and a cylinder having a cylindrical inner surface provided in a cylinder block of the compression section, and a crank of a drive shaft connected to the electric motor. In order to rotate the inner roller exteriorly mounted on the part without rotating, the rotation preventing member is locked between the stationary member fastened to the cylinder block and the inner roller, and the inner roller moves along the inner surface of the cylinder. And an outer roller external to the inner roller, and formed into the cylinder inner surface and the outer roller outer surface by projecting and retracting from the cylinder block into the cylinder so that a tip thereof slides on the outer peripheral surface of the outer roller. A rolling piston type rotary compressor including a blade for partitioning a compression chamber. 2. A flat portion parallel to each other is provided on an outer peripheral portion of an end portion of the inner roller, and the rotation preventing member has a through hole having two flat portions fitted into the flat portion at a substantially central portion thereof. The rolling piston type rotary compression according to claim 1, comprising an annular plate, and two key portions on one surface of the annular plate orthogonal to the two plane portions, wherein the two key portions are locked to a stationary member. Machine. 3. An oil passage is provided in a sliding contact surface between an inner roller and an outer roller, while annular concave portions are provided on both end surfaces of the outer roller, respectively, and the oil passage is opened to the annular concave portion. 2. The rolling piston according to claim 1, further comprising: an oil supply passage which sequentially passes through the one annular recessed portion, the oil passage, the other annular recessed portion, and a motor chamber accommodating the motor from the inside of the inner roller. Type rotary compressor. 4. The rolling piston type rotary compressor according to claim 3, wherein the storage chamber in which the rotation preventing member is disposed is disposed in the middle of the oil supply passage. 5. The rolling piston type rotary compressor according to claim 3, wherein an oil passage is formed by making a part of the outer peripheral surface of the inner roller into a cut plane shape. 6. A storage chamber provided in the stationary member, wherein one of a main bearing disposed on the side of the electric motor for supporting the drive shaft and a sub-bearing disposed on the opposite side of the electric motor is a stationary member. 5. The rolling piston type rotary compressor according to claim 4, wherein an intermediate partition plate is arranged to partition between the outer roller and an end surface of the outer roller. 7. The rolling piston type rotary compressor according to claim 3, wherein at least one pair of oil holes communicating with the annular concave portion is symmetrically arranged on the outer roller. 8. A flat portion provided on an outer peripheral portion of an end portion of the inner roller and a cut flat portion provided on an outer peripheral surface of the inner roller to form an oil passage are substantially parallel to each other. Rolling piston type rotary compressor.