JP2004360623A - Compressor for refrigerating air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary bearing supporting structure of a compressor for a refrigerating air conditioner facilitating the supply of lubricating oil to a compression mechanism, being excellent in reliability, anti-noise performance, anti-vibration performance, assembling performance and the like, having a small number of components and being inexpensive. <P>SOLUTION: An auxiliary bearing 202 has both a plain bearing structure capable of supporting a radial face 210 and a thrust face 211 and part of an oil supply mechanism, and is supported and fixed via a plate 201 fixed to a closed vessel 101 with bolts 203 and the like after vertical centering. By this structure, the lubricating oil 107 is branched, and can be lubricated to the radial face 210 and the thrust face 211. Accordingly, the simple auxiliary bearing structure with a small number of components can be constituted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compressor for refrigeration and air-conditioning used in an air conditioner (air conditioner) for business use and home use, and more particularly to a support structure for a drive shaft thereof.
[0002]
[Prior art]
As a conventional compressor for refrigeration and air-conditioning, a closed electric horizontal scroll compressor will be described as an example and will be described with reference to the drawings.
[0003]
Conventionally, a sub-bearing of a two-bearing refrigeration / air-conditioning compressor having a crankshaft support mechanism including a main shaft to a main bearing and a sub-shaft to a sub-bearing has a shaft center between the main shaft to the main bearing and the sub-shaft to the sub-bearing. In order to facilitate alignment (hereinafter referred to as vertical centering), it has been common to use a ball bearing (for example, see Patent Document 1).
[0004]
FIG. 4 is a cross-sectional view of a compressor for refrigeration and air-conditioning showing a conventional support structure from a countershaft to a sub-bearing described in Patent Document 1.
[0005]
As shown in FIG. 4, a compression mechanism unit 102, a motor unit 103, a crankshaft 106, and a plate 116 are installed inside the closed container 101. The electric motor unit 103 includes a stator 104 and a rotor 105, and the torque generated by the electric motor unit 103 is transmitted to the compression mechanism unit 102 by the crankshaft 106. The compression mechanism 102 includes a bearing member 108 on which a main bearing bush 109 is installed, a fixed scroll 110, an orbiting scroll 113, and an Oldham ring 115. When the rotational force is transmitted to the compression mechanism 102, a compression action is generated by these components. As a result, the low-pressure refrigerant is sucked from the suction pipe 111 provided in the closed container 101, compressed by the compression mechanism 102, and then discharged from the discharge pipe 112 as high-pressure refrigerant. Since the compression principle of the scroll compressor is already known, it will not be described here.
[0006]
The crankshaft 106 is rotatably supported by a main bearing 109 installed on the compression mechanism 102 and an auxiliary bearing 114 provided on a plate 116 fixed to the closed casing 101. As the auxiliary bearing 114, a ball bearing is generally used, and in the example shown in FIG. 4, it is press-fitted and fixed to a concave portion 118 of a plate 116 welded and fixed to the closed vessel 101.
[0007]
The rotor 105 is shrink-fitted and fixed to the crankshaft 106, and the magnetic center position thereof is closer to the main bearing 109 than the magnetic center position of the stator 104 shrink-fitted and fixed to the closed casing 101. As a result, a magnetic attraction force acts on the rotor 105 on the stator 104, and a thrust load (hereinafter, this force is referred to as a preload) acts on the crankshaft 106 in the direction of the auxiliary bearing 114. The noise generated from the auxiliary bearing (ball bearing) 114 during operation can be reduced, and the thrust vibration of the crankshaft 106 in the thrust direction can be suppressed.
[0008]
Here, the auxiliary bearing (ball bearing) 114 simultaneously supports the radial load due to the rotation of the crankshaft 106 and the thrust load due to the preload during the actual operation of the compressor.
[0009]
On the other hand, a lubrication mechanism 117 is installed on the plate 116, and when the crankshaft 106 rotates, the lubricating oil 107 stored inside the sealed container 101 is pumped up, and a lubrication hole provided at the center of the crankshaft 106 is opened. As a result, each part of the compression mechanism 102 is lubricated.
[0010]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-158872 (page 2, FIG. 6)
[0011]
[Problems to be solved by the invention]
However, when a ball bearing is used as an auxiliary bearing of a compressor for refrigeration and air conditioning as in the above-described conventional configuration, the ball and the race are basically in point contact, so that the surface pressure between the ball and the race is large. For this reason, abnormal wear and adhesion (seizure) due to fatigue are likely to occur, which may be a factor of poor compressor quality such as abnormal noise and increased input. In particular, when using ball bearings, which generally have a finite life in a closed container such as a compressor for refrigeration and air conditioning, as bearings, if abnormal wear or sticking (seizure) occurs as described above, replace them. Is difficult, and it is a severe use condition in which the refrigerant and the lubricating oil are used in a mixed state.
[0012]
Further, when the capacity of the compressor is increased, the radial load on the auxiliary bearing is also increased, and when the same ball bearing is used, the reliability tends to be significantly deteriorated. In order to alleviate the load caused by point contact, it is possible to increase the ball diameter of the ball bearing or to increase the size of the entire ball bearing. It is necessary and costs are high, so it lacks mass productivity.
[0013]
On the other hand, compressors for refrigeration and air-conditioning, which have been increasing in recent years, are widely used from a low frequency range around 10 Hz to a high frequency range exceeding 100 Hz, such as an inverter drive. It is demanded that the lubricating oil supply to the parts be improved in all frequency ranges, and that the number of parts be reduced in terms of assemblability and cost.
[0014]
The present invention solves all of these problems, and facilitates the supply of lubricating oil to the compression mechanism, and furthermore has excellent reliability, noise, vibration, assemblability, etc. An object of the present invention is to provide a small and inexpensive sliding auxiliary bearing support structure for a compressor for refrigeration and air conditioning.
[0015]
[Means for solving the problem]
In order to solve the above-mentioned conventional problems, the auxiliary bearing of the hermetic compressor according to the present invention has the same lubrication mechanism as a sliding bearing structure which receives a thrust load applied from a crankshaft and a radial load due to rotation of the crankshaft. It is held together as a member, and is supported and fixed after vertical centering by bolts etc. through a plate fixed by welding etc. in the sealed container, and the lubricating oil is branched from the oil supply mechanism between the compression mechanism and the sub shaft-sub bearing surface And a sliding bearing structure between the counter shaft and the counter bearing provided with an oil supply path for lubrication at the same time.
[0016]
With this configuration, lubricating oil can be easily supplied between the compression mechanism and the sub-shaft to the sub-bearing surface, and it is excellent in reliability, noise, vibration, assemblability, etc. The present invention can provide a sliding bearing structure between the auxiliary bearing surface and a compressor for refrigeration and air conditioning provided with the same.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
(Embodiment 1)
FIG. 1 is an example of a cross-sectional view of a closed electric vertical scroll compressor according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a sub shaft to a sub bearing portion. 1 and 2 and the same components as those in FIG. 6 are denoted by the same reference numerals, and the description of the same components as in FIG. 4 is omitted.
[0019]
In FIG. 2, a sub bearing 202 is fixed to a plate 201 with holes fixed to the closed container 101 by bolts 203 after centering in the vertical direction. The auxiliary bearing 202 is provided with a hole into which the gear 207 as a main component of the oil supply mechanism 117 is assembled. The gear 207 is engaged with a pump shaft 206 provided at the end of the crankshaft 106, and is configured to rotate with the rotation of the crankshaft 106 to form an oil supply mechanism (forced oil supply) as in the conventional example. In the case of the present embodiment, the lubricating oil 107 is branched from a gap 209 between the pump shaft 206 and the pump shaft hole 208 provided for the pump shaft 206 to penetrate through the sub-bearing 202, particularly at the time of this forced lubrication. The oil groove 205 provided in the sub shaft 204 makes it possible to supply the lubricating oil 107 to the thrust surface 211 and the radial surface 210 between the sub shaft 204 and the sub bearing 202. It constitutes a sliding auxiliary bearing structure capable of receiving a thrust load and a radial load.
[0020]
Further, in order to reduce the number of parts and reduce the cost, the auxiliary bearing 202 in this embodiment has a specification that uses a sintered material as a material and aims at improving self-lubricating properties by improving oil retention.
[0021]
According to such a configuration, an inexpensive sliding auxiliary bearing structure which receives the thrust load and the radial load, is excellent in noise, vibration, assemblability, and the like can be provided. And a long life, so high reliability can be realized.
[0022]
In this embodiment, the oil groove 205 is provided on the sub shaft 204 side, but may be provided on the sub bearing 202 side, and the sub bearing 202 may be fixed to the plate 201 by welding or the like.
[0023]
(Embodiment 2)
FIG. 3 is an enlarged sectional view of the sub shaft to the sub bearing portion according to Embodiment 2 of the present invention. 3, the same components as those in FIGS. 1, 2, and 4 are denoted by the same reference numerals, and description thereof will be omitted.
[0024]
In FIG. 3, bearing members 212 and 213 are incorporated in the sub-bearing 202 so that a larger radial load or thrust load can be received.
[0025]
In addition, in order to reduce the cost, the auxiliary bearing 202 in this embodiment has a specification using a cast iron material as a material.
[0026]
By incorporating the radial bearing member 212 and the thrust bearing member 213 into the auxiliary bearing, it is possible to use the motor section 103 with a larger capacity and a higher efficiency of the compression mechanism section 102 by a simple specification change, and It is possible to easily realize high reliability and the like by increasing the capacity and efficiency and further improving the initial conformability.
[0027]
In the second embodiment, the case where the radial bearing member 212 and the thrust bearing member 213 are incorporated at the same time has been described. However, the bearing material is a material that can be expected to have self-lubricating properties such as the sintered material. Thus, only the bearing member 212 may be used to reinforce the load in the radial direction, or only the thrust direction bearing member 213 may be used to reinforce the load in the thrust direction.
[0028]
【The invention's effect】
As described above, according to the sliding bearing structure between the sub shaft and the sub bearing surface of the present invention, it is possible to easily configure the supply of the lubricating oil between the compression mechanism and the sub shaft to the sub bearing surface, thereby improving reliability and reliability. It is possible to provide an inexpensive sliding bearing structure between a countershaft and a subbearing surface which is excellent in noise, vibration, assemblability, etc., and a refrigerating / air-conditioning compressor including the same.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a scroll compressor according to Embodiment 1 of the present invention. FIG. 2 is an enlarged sectional view of a sub shaft to a sub bearing of the scroll compressor according to Embodiment 1 of the present invention. Enlarged sectional view of sub-shaft to sub-bearing of scroll compressor according to Embodiment 2 [FIG. 4] Cross-sectional view of conventional scroll compressor [Description of reference numerals]
101 Closed container 102 Compression mechanism 103 Motor unit 104 Stator 105 Rotor 106 Crankshaft 107 Lubricating oil 108 Bearing member 109 Main bearing 110 Fixed scroll 111 Suction pipe 112 Suction pipe 113 Orbiting scroll 114 Secondary bearing (ball bearing)
115 Oldham ring 116 Plate 117 Lubrication mechanism 118 Plate recess 201 Plate (with hole)
202 Secondary bearing (slip)
203 bolt 204 sub shaft 205 oil groove 206 pump shaft 207 gear 208 pump shaft hole 209 gap between pump shaft and pump shaft hole 210 radial surface 211 thrust surface 212 radial bearing member 213 thrust bearing member

Claims (2)

A compression mechanism section that performs a compression operation via a crankshaft, a motor that drives the compression mechanism section, and an oil supply mechanism that supplies lubricating oil to the compression mechanism section from an oil supply hole provided at the center of the crankshaft are arranged in a closed container. In the compressor for refrigeration and air conditioning, the crankshaft is supported by a main bearing and an auxiliary bearing with an electric motor interposed therebetween, and a load (preload) is always applied to the anti-compression mechanism side (auxiliary bearing side). The auxiliary bearing has the sliding bearing structure and a part of the lubrication mechanism that receive the thrust load applied from the crankshaft and the radial load due to the rotation of the crankshaft as the same member, and a closed vessel is provided with a plate fixed by welding or the like. An oil supply path (oil groove or the like) that is supported and fixed after centering of the crankshaft by a bolt or the like and that divides and simultaneously lubricates the lubricating oil between the compression mechanism and the sub shaft to the sub bearing surface by the same oil supply mechanism. Refrigeration air conditioning compressor, characterized in that it comprises a sliding bearing structure between northern countershaft-sub-bearing surface. The refrigerating and air-conditioning compressor according to claim 1, comprising a sliding bearing structure between the counter shaft and the sub bearing surface, wherein the bearing member is fitted to a bearing surface that receives a radial load or a thrust load.

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