KR101386480B1 - Rotary compressor - Google Patents

Abstract

The present invention relates to a rotary compressor. In the rotary compressor according to the present invention, the upper bearing, the lower bearing, the crankshaft and the rolling piston are made of an aluminum material having a hardness in the range of 40 to 65, and processed to have an illuminance of 2.0 Z or less, thereby providing a long time for the compressor. Even during operation, it is possible to reduce the processing time of the upper bearing, the lower bearing, the crankshaft or the rolling piston, and to prevent wear of each member even when the compressor is used for a long time. To prevent it.

Upper bearing, lower bearing, crankshaft, rolling piston, aluminum, wear

Description

ROTARY COMPRESSOR

The present invention relates to the material of the rotating shaft and the rolling piston of the rotary compressor and the bearing member for supporting the rotating shaft and the rolling piston.

In general, the rotary compressor is provided with an electric mechanism consisting of a stator and a rotor on the inner upper portion of the sealed container surrounding the outside. And a crank shaft which is press-fitted and fixed to the inner diameter of the rotor at the inner lower portion of the sealed container, and an eccentric portion is formed at the lower portion thereof, a cylinder accommodating the eccentric portion of the crank shaft at the lower portion of the crank shaft, and upper and lower sides of the cylinder. The upper and lower bearings that cover the crankshaft and the rolling bearing are inserted into the eccentric part and rotated while contacting the inner diameter of the cylinder by the rotation of the crankshaft, and are coupled to contact the rolling piston on one side of the cylinder. Compressor mechanisms including vanes for dividing the inside of the cylinder into a suction zone and a discharge zone are provided.

In the rotary compressor, when a current is applied and the rotor rotates, the crank shaft press-fitted to the rotor is supported by the upper bearing and the lower bearing to rotate, and the rolling piston is rotated by the crank shaft. While the inner circumferential surface is in contact with the inner circumferential surface and the turning movement, the vane is axially contacted with the rolling piston in the axial direction by the turning movement of the rolling piston to suck and compress the refrigerant inside the cylinder to seal It is discharged into the inner space of the container.

Here, as the upper bearing and the lower bearing are in contact with the crankshaft to slide, the thrust surface of the upper bearing and the lower bearing or the thrust surface of the rotating shaft and the thrust surface of the rolling piston are required to be precisely processed. . In particular, since the thrust surface of the lower bearing supports the crankshaft and the rolling piston in the axial direction, the precision and accuracy of wear are required as well.

An object of the present invention is to provide a rotary compressor that can reduce the processing time and to prevent wear by maintaining excellent mechanical properties even during long operation of the compressor.

In order to achieve the object of the present invention, the bearing member or the bearing member to cover the upper and lower sides of the cylinder is rotated and coupled to the crankshaft member or the crankshaft member while being rotated and is supported by the bearing member to rotate the vane and There is provided a rotary compressor including a rolling piston member for compressing a refrigerant together, wherein at least one of the members in sliding contact with each other is made of aluminum.

In the rotary compressor according to the present invention, the upper bearing, the lower bearing, the crankshaft and the rolling piston are made of an aluminum material having a hardness in the range of 40 to 65, and processed to have an illuminance of 2.0 Z or less, thereby providing a long time for the compressor. Even during operation, it is possible to reduce the processing time of the upper bearing, the lower bearing, the crankshaft or the rolling piston, and to prevent wear of each member even when the compressor is used for a long time. To prevent it.

The bearing member of the rotary compressor of the present invention and the manufacturing method thereof will be described in detail based on the embodiment shown in the accompanying drawings.

1 and 2, in the rotary compressor according to the present invention, the electric mechanism part 20 and the compression mechanism part 30 are installed together in the inner space of the sealed container 10.

The transmission mechanism 20 includes a stator 21 having a coil wound thereon and fixed to the hermetically sealed container 10, a rotor 22 rotatably installed inside the stator 21, And a crankshaft 23 which is press-fitted into the crankshaft 22 and rotates together.

Here, the crankshaft 23 is composed of an axial portion 23a supported by the upper bearing 32 and the lower bearing 33 to be described later, and an eccentric portion 23b eccentrically formed at the lower end of the shaft portion 23a. . An oil passage 23c is formed in the shaft portion 23a and an oil feeder (not shown) is provided at a lower end of the oil passage 23c. The radial surface 23d is inserted into the bearing holes 32a and 32b of the upper bearing 32 and the lower bearing 33 at the lower half of the shaft portion 23a so that the radial surface 23d is radially supported. It is formed on both of the shaft portion (23a) to the center, the oil surface (not shown) is formed on the radial surface (23d) so as to communicate with the oil passage. The radial surface 23d may be machined so that the roughness thereof is precisely in the range of 43 to 60.

The crankshaft 23 is formed to be eccentrically or expanded smaller than the eccentric portion 23b between both radial surfaces 23d and is supported on the thrust surfaces of the upper bearing 32 and the lower bearing 33 ( 23e) is formed. The thrust surface 23e of the crankshaft 23 is precision machined to have roughness of about 2.0Z or less, more precisely about 1.6Z or less, and hardness (HRC) of 40 to 65, more precisely, 43 to 60. Can be processed as possible.

The crankshaft 23 uses spherical graphite iron, and the amount thereof is carbon (3.5-3.9% wt), silicon (2.5-2.8% wt), and manganese (0.3% or less wt) as shown in Table 1 below. ), Phosphorus (less than 0.05% wt), sulfur (less than 0.05% wt), magnesium (less than 0.05% wt), and tin (0.05% wt). The crankshaft 23 is heat treated and then subjected to surface treatment (lubulite coating + MoS 2 coating) to improve wear resistance.

ingredient C Si Mn P S Mg Sn Specification range 3.5 to 3.9 2.5 ~ 2.8 0.3 or less 0.05 or less 0.03 or less 0.05 or less 0.05 or less Optimum 3.7 2.6 0.2 0.03 0.01 0.04 0.03

The compression mechanism 30 has an annular cylinder 31, an upper bearing 32 covering the upper side of the cylinder 31, and a lower bearing 33 covering the lower side of the cylinder 31; And a rolling piston 34 rotatably coupled to the eccentric portion 23b of the crankshaft 23 and disposed in the compression space of the cylinder 31, and pressed against the rolling piston 34 to press the cylinder 31. It includes a vane (35) coupled to the reciprocating motion in a straight line.

At the center of the upper bearing 32 and the lower bearing 33, bearing holes 32a and 33a are formed to radially support the crankshaft 23, and the bottom and lower bearings of the upper bearing 32 are formed. On the upper surface of (33), thrust surfaces 32b and 33b which support the thrust surface 23e of the crankshaft 23 and support the upper and lower surfaces of the rolling piston 34 are formed. The roughness of the thrust surfaces 32b and 33b of the upper bearing 32 and the lower bearing 33 is about 2.0 Z or less, more precisely about 1.6 Z or less, and the hardness (HRC) is 40 to 65, more precisely 43 to It can be processed to be in the range of 60.

The upper bearing 32 and the lower bearing 33 may be formed of a material containing a predetermined amount of aluminum. For example, the upper bearing 32 and the lower bearing 33 are copper (1.5 ~ 3.5% wt), silicon (9.6 ~ 12.0% wt), magnesium (0.3 or less% wt), zinc as shown in Table 2 below. (1.0% wt), iron (1.3% wt), manganese (less than 0.5% wt), nickel (less than 0.5wt), tin (0.3% wt) and aluminum (residual amount) to have a component amount of excellent wear resistance Can have

ingredient Cu Si Mg Zn Fe Mn Ni Sn Al Specification range 1.5 to 3.5 9.6-12.0 0.3 or less 1.0 or less 1.3 or less 0.5 or less 0.5 or less 0.3 or less Balance

The rolling piston 34 is made of a material such as carbon, silicon, manganese, phosphorus, sulfur, nickel, chromium and molybdenum. For example, as shown in Table 3 below, the rolling piston 34 includes carbon (3.0 to 3.6% wt), silicon (1.8 to 2.4% wt), manganese (0.5 to 1.0% wt), and phosphorus (0.1 to 0.3%). wt), sulfur (0.15% or less), nickel (0.2-0.4% wt), chromium (0.5-1.0% wt), and molybdenum (0.15-3.9% wt). Sulfur may not be included here.

ingredient C Si Mn P S Ni Cr Mo Specification range 3.0-3.6 1.8 ~ 2.4 0.5 to 1.0 0.1 to 0.3 0.15 or less 0.2 to 0.4 0.5 to 1.0 0.15-3.9 Optimum 3.3 2.1 0.7 0.25 0 0.3 0.75 0.28

In the figure, SP and DP are discharge pipes.

The rotary compressor according to the present invention as described above is operated as follows.

That is, when power is applied to the stator 21 of the power transmission unit 20 and the rotor 22 rotates, the crankshaft 23 rotates together with the rotor 22 while the power transmission unit 20 is rotated. ) Is transmitted to the rolling piston 34 of the compression mechanism (30). While the rolling piston 34 pivots by the crankshaft 23, the refrigerant moves from the suction region to the compression region, and is blocked by the vanes 35, thereby compressing the refrigerant and then compressing the upper bearing 32. It is discharged into the inner space of the sealed container 10 through the discharge port (32a).

Here, the thrust surface 23e provided on the shaft portion 23a of the crankshaft 23 and the upper and lower surfaces of the rolling piston 34 are thrust surfaces 32b and 33b of the upper bearing 32 and the lower bearing 33. ) Is supported and rotates. At this time, the upper bearing 32 and the lower bearing 33, in particular the lower bearing 33 is made of an aluminum material of the above components so that the hardness is in the range of 40 ~ 65 and at the same time roughness 2.0Z or less By processing to ensure that wear can be significantly reduced. In this case, the crankshaft 23 and the rolling piston 34 can be manufactured with the above components.

The results of experimenting with the amount of wear of the upper bearing 32 and the crankshaft 23 is shown in FIG. 3. According to this experiment, when the lower bearing 33 is made of an aluminum material subjected to heat treatment and surface treatment and processed to a roughness of 1.6 Z, the wear of the lower bearing 33 is approximately 0.5 μm for 1000 hours and a crankshaft ( It can be seen that the wear of 23) is about 3 μm. When the same heat treatment and surface treatment were performed and the roughness of the lower bearing 33 made of aluminum was 3.0Z, the wear of the lower bearing 33 was approximately 2 μm for 1000 hours, and the wear of the crankshaft 23 was reduced. It can be seen that it was significantly reduced compared to the 5㎛. And when the lower bearing 33 is formed of an iron-based material such as cast iron, only heat treatment, and the roughness is processed to 1.6Z, wear of the lower bearing 33 is approximately 4 μm for 1000 hours and wear of the crankshaft 23. Is 10 μm, and when the roughness is processed to 3.0Z without heat treatment and surface treatment, the wear of the lower bearing 33 is approximately 6 μm for 10000 hours and the wear of the crankshaft 23 is approximately 18 μm. It can be seen that the wear is further reduced.

On the other hand, if there is another embodiment of the rotary compressor according to the present invention.

That is, in the above-described embodiment, the material of the upper bearing 32 and the lower bearing 33, especially the lower bearing 33, was made of a material containing aluminum as its main component, and its hardness and roughness were limited. In the embodiment, the material of the crankshaft 23 or the rolling piston 34 may be made of a material containing aluminum as its main component, and its hardness and roughness may be formed in the above ranges. In this case, the upper bearing 32 or the lower bearing 33 may be the same as any of the component contents of the crankshaft or the rolling piston 34 in the above-described embodiment.

Since the operation and effect thereof is similar to the above-described embodiment, a detailed description thereof will be omitted.

1 is a longitudinal sectional view showing a rotary compressor of the present invention;

FIG. 2 is a transverse sectional view showing a compression mechanism of the rotary compressor according to FIG.

Figure 3 is an experimental table showing the wear results for the crankshaft and the lower bearing made of aluminum in the rotary compressor compressor of the present invention.

Description of Reference Numerals in Main Parts of the Drawings

23: crankshaft 23a: shaft portion

23b: eccentric 23c: oil euro

23d: radial plane 23e: thrust plane

32: upper bearing 32a: bearing hole

32b: thrust surface 33: lower bearing

33a: bearing hole 33b: thrust surface

Claims (7)

delete delete A rolling piston member which is supported by a bearing member or its bearing member covering the upper and lower sides of the cylinder and is rotated while being coupled to the crankshaft member or its crankshaft member and is supported by the bearing member and is rotated and rotated to compress the refrigerant together with the vanes. Including, At least one of the bearing members of the both sides further comprises magnesium, iron, manganese, nickel, tin in an aluminum material containing copper, silicon, zinc, etc., the bearing member is copper (1.5 ~ 3.5% wt) , Silicon (9.6 ~ 12.0% wt), magnesium (0.3% or less), zinc (1.0% wt), iron (1.3% wt), manganese (0.5% or less), nickel (0.5% or less), tin (0.3%) % wt) and aluminum (remaining amount), the amount of components, such as a rotary compressor. A rolling piston member which is supported by a bearing member or its bearing member covering the upper and lower sides of the cylinder and is rotated while being coupled to the crankshaft member or its crankshaft member and is supported by the bearing member and is rotated and rotated to compress the refrigerant together with the vanes. Including, At least one of the bearing members is formed of an aluminum material including copper, silicon, zinc, and the like, and the bearing member has a sliding surface roughness of 2.0 or less. A rolling piston member which is supported by a bearing member or its bearing member covering the upper and lower sides of the cylinder and is rotated while being coupled to the crankshaft member or its crankshaft member and is supported by the bearing member and is rotated and rotated to compress the refrigerant together with the vanes. Including, At least one of the bearing members of the both sides is formed of an aluminum material including copper, silicon, zinc, etc., wherein the bearing member is formed so that the hardness (HRC) is in the range of 40 ~ 65. A rolling piston member which is supported by a bearing member or its bearing member covering the upper and lower sides of the cylinder and is rotated while being coupled to the crankshaft member or its crankshaft member and is supported by the bearing member and is rotated and rotated to compress the refrigerant together with the vanes. Including, At least one of the bearing members is formed of an aluminum material including copper, silicon, zinc, and the like, and the crankshaft is formed of cast iron. 5. The method of claim 4, The crankshaft is a rotary compressor, characterized in that for performing a surface treatment for wear resistance (lubulite coating + MoS2 coating) on the surface.

Images