JP3757525B2 - Hermetic compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hermetic compressor such as a scroll compressor or a rotary compressor used in an air conditioner or a refrigerator.
[0002]
[Prior art]
Conventionally, a hermetic compressor such as a scroll compressor or a rotary compressor has been used for a cooling device such as a cooling / heating device or a refrigerator. As a conventional technique of this type of compressor, a scroll compressor will be described as an example with reference to the drawings.
[0003]
As shown in FIG. 7, the airtight container 101 includes a compression mechanism unit 102, a rotor 104 and a stator 105 constituting the motor unit 103, and a crankshaft that transmits the rotational force of the motor unit 103 to the compression mechanism unit 102. 106, a main bearing 107 and a sub bearing 108 that support the crankshaft 106 are installed on both sides of the electric motor unit 103, and the sub bearing 108 is supported by a fixing member 109. In addition, an oil reservoir 110 is disposed at the lower part of the sealed container. Further, the sealed container 101 receives the high-pressure refrigerant gas compressed by the compression pipe 102 and the suction pipe 111 for sucking the low-pressure refrigerant gas. A discharge pipe 112 for discharging to the outside is provided, and an oil pump 113 is provided at the end of the crankshaft 106.
[0004]
In the above configuration, when the rotor 104 of the electric motor unit 103 rotates, this rotational force is transmitted to the compression mechanism unit 102 by the crankshaft 106. When the rotational force is transmitted to the compression mechanism unit 102, the refrigerant gas is compressed. As a result, the low-pressure refrigerant gas sucked from the suction pipe 111 is compressed into the high-pressure refrigerant gas by the compression mechanism unit 102, and is once discharged into the discharge port side space 114 in the sealed container 101, and then into the compression mechanism unit 102. It passes through the notch 116 provided in the communication port 115 and the stator 105 provided, reaches the sub bearing side space 117, and is finally discharged from the discharge pipe 112 into the refrigeration cycle.
[0005]
As a result of the compression action described above, the crankshaft 106 is subjected to deflection due to the weight of the rotor 104 and the suction force generated in the motor unit 103 in addition to the radial load during refrigerant compression. As a result, the sub-bearing 108 is particularly hit and causes wear and seizure. Further, since the crankshaft 106 is supported at both ends, coaxial accuracy of the main bearing 107 and the sub-bearing 108 is required at the time of assembly. In this conventional example, a rolling bearing is used as the sub-bearing 108, press-fitted and fixed to the fixing member 109, and this is fixed to the sealed container 101 by welding. A centering function is provided by the play generated between the inner ring 118 and the outer ring 119 of the rolling bearing.
[0006]
Hand, refrigerating machine oil of the oil reservoir 110, after being pumped through the oil pump 113 through the communication port 120 provided on the crank shaft 106, is supplied to the compression mechanism unit 102. The refrigerating machine oil returns to the oil reservoir 110 after lubricating the sliding portion of the compression mechanism portion 102.
[0007]
[Problems to be solved by the invention]
In the prior art, by adopting a rolling bearing as the sub-bearing, it is possible to prevent seizure and seizure due to bending deformation of the crankshaft and to reduce the assembly accuracy of both bearings. However, the rolling bearing is very expensive, and since it is press-fitted and fixed to the fixing member, accuracy on the fixing member side is also required. In addition, during operation, the rolling noise of the steel balls and the play of the inner and outer rings may cause a decrease in compressor performance such as increased sound pressure level, unstable sound quality, and increased vibration compared to sliding bearings. Becomes higher. In addition, the tolerance for the alignment of the rolling bearing is only due to the play of the inner and outer rings, and if the shaft misalignment exceeds that, the torque required for rotation of the crankshaft increases rapidly, resulting in an increase in power consumption. Or, it will lead to the start failure of the compressor. In addition, since the fixing member that has already press-fitted and fixed the sub-bearing is welded to the sealed container, misalignment of the shaft due to distortion during welding is likely to occur.
[0008]
The present invention solves the above-described problems, and achieves at low cost means for preventing wear due to contact of a sub-bearing due to deflection of the crankshaft and displacement of the shaft core during product assembly. Furthermore, vibrations and noises generated from the rolling bearings are eliminated, and an increase in power consumption caused by shaft misalignment between both bearings is prevented, so that highly reliable assembly is facilitated. The purpose is to provide a low-cost compressor with high efficiency and low noise.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an electric motor in the central part of a sealed container, a compression mechanism that is driven by the electric motor via a crankshaft on one side, and an auxiliary shaft part of the crankshaft on the other side. In the hermetic compressor comprising a secondary bearing for supporting the secondary bearing and a fixing member for supporting the secondary bearing, the contact portion of the stationary member with the secondary bearing is recessed toward the counter-motor side in a tapered shape, and the secondary compressor is in contact with the tapered shape portion. One end of the outer periphery of the bearing has a spherical shape, and the auxiliary bearing is sandwiched between the crankshaft and a fixing member.
[0010]
As a result, when the crankshaft is tilted due to deflection deformation or misalignment of both bearings during assembly, the secondary bearing tends to tilt following this, but at this time, the contact between the secondary bearing and the fixing member that supports the secondary bearing Since the portion is composed of a combination of a spherical shape and a tapered shape, the secondary bearing is easy to slide and can easily follow the crankshaft. Furthermore, in this specification, it can also serve as a thrust bearing that receives a load in the thrust direction generated on the crankshaft.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, an electric motor is disposed in the central portion of the sealed container, and a compression mechanism portion driven by the electric motor via a crankshaft is supported on one side and a countershaft portion of the crankshaft is supported on the other side. A hermetic compressor including an auxiliary pump that supports the auxiliary bearing, an oil pump that supplies lubricating oil to the compression mechanism, and a contact portion of the fixed member with the auxiliary bearing is tapered toward the motor side. An indentation is provided with a secondary bearing having a spherical outer peripheral corner on the anti-motor side of the fixed member, and the auxiliary pump is sandwiched between the oil pump having the tapered recess on the anti-motor side and the fixed member. It is.
[0016]
According to the second aspect of the present invention, the contact portion between the fixing member and the sub-bearing of the oil pump has a spherical shape or a combination of a spherical shape and a tapered shape.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
Example 1
As shown in FIG. 1, inside the sealed container 1, a crankshaft that transmits the rotational force of the compressor 4, the rotor 4 and the stator 5 that constitute the motor unit 3, and the motor unit 3 to the compression mechanism 2. 6. A main bearing 7 and a sub-bearing 8 for supporting the crankshaft 6 are installed on both sides of the motor unit 3, and the sub-bearing 8 is supported by a fixing member 9. In addition, an oil reservoir 10 is disposed at the lower part of the sealed container. Further, the sealed container 1 receives a high-pressure refrigerant gas compressed by the suction pipe 11 for sucking the low-pressure refrigerant gas and the compression mechanism unit 2 in the sealed container. A discharge pipe 12 for discharging to the outside is provided, and an oil pump 13 is provided at the end of the crankshaft 6.
[0019]
In the above configuration, when the rotor 4 of the electric motor unit 3 rotates, this rotational force is transmitted to the compression mechanism 2 by the crankshaft 6. When the rotational force is transmitted to the compression mechanism unit 2, the refrigerant gas is compressed. As a result, the low-pressure refrigerant gas sucked from the suction pipe 11 is compressed into the high-pressure refrigerant gas by the compression mechanism unit 2, and is once discharged into the discharge port side space 14 in the sealed container 1, and then into the compression mechanism unit 2. It passes through the communication port 15 provided and the notch 16 provided in the stator 5, reaches the auxiliary bearing side space 17, and is finally discharged from the discharge pipe 12 into the refrigeration cycle.
[0020]
As a result of the compression action described above, the crankshaft 6 is subjected to deflection due to the weight of the rotor 4 and the suction force generated in the motor unit 3 in addition to the radial load during refrigerant compression. As a result, the sub-bearing 8 is particularly likely to come into contact with each other, causing wear and seizure. Further, since the crankshaft 6 is supported at both ends, the coaxial accuracy of the main bearing 7 and the sub-bearing 8 is required during assembly.
[0021]
Therefore, in the present invention, the contact portion of the fixing member 9 with the auxiliary bearing 8 is tapered, and one end of the outer periphery of the auxiliary bearing 8 in contact with the tapered portion is formed in a spherical shape, and the auxiliary bearing 8 is fixed to the crankshaft 6. It is sandwiched between the members 9. According to this configuration, when the crankshaft 6 is inclined due to deflection deformation or misalignment of the main bearing 7 and the subbearing 8 at the time of assembly, the subbearing 8 receives the thrust direction force of the crankshaft 6 and follows this. At this time, the contact portion of the sub-bearing 8 and the fixing member 9 that supports the sub-bearing 8 is composed of a combination of a spherical shape and a tapered shape, so that the sub-bearing 8 is easy to slide and the crankshaft 6 Can be easily followed, and as a result, the piece contact can be prevented.
[0022]
(Example 2)
In FIG. 2, the contact portion of the fixing member 9 with the auxiliary bearing 8 is formed in a spherical shape. As a result, when the crankshaft 6 is tilted due to deflection deformation or misalignment of the main bearing 7 and the sub-bearing 8 during assembly, the spherical portion of the sub-bearing 8 and the spherical portion of the fixing member 9 slide following this. Thus, it is possible to prevent contact with one piece.
[0023]
Example 3
In FIG. 3, the contact portion of the fixed member 9 with the auxiliary bearing 8 is recessed in a tapered shape on the motor side, and the auxiliary bearing 8 having a spherical corner on the outer periphery is disposed on the counter motor side of the fixed member 9. Further, an auxiliary fixing member 18 having a tapered shape is provided on the counter-motor side of the auxiliary bearing 8 so as to sandwich the auxiliary bearing.
[0024]
According to this configuration, when the crankshaft 6 is inclined, the thrust load applied to the sub-bearing 8 is changed from the uniform distribution to the uneven distribution. As a result, the secondary bearing 8 tries to incline following the crankshaft 6 so that the thrust load is evenly distributed. At this time, the auxiliary bearing 8 and the fixing member 9 supporting the auxiliary bearing 8 and the auxiliary fixing member 18 Since the contact portion is composed of a combination of a spherical shape and a tapered shape, the secondary bearing 8 is easy to slide and can easily follow the crankshaft 6. As a result, as in the above embodiment, it is possible to prevent one-side contact. . Furthermore, in this specification, the parts can be assembled sequentially from the counter-motor direction with reference to the crankshaft 6 so that assembly is easy.
[0025]
(Example 4)
In FIG. 4, the contact portions of the fixing member 9 and the auxiliary fixing member 18 with the secondary bearing 8 are spherical or a combination of a spherical shape and a tapered shape. As a result, the same effect as in the above embodiment can be obtained.
[0026]
(Example 5)
In FIG. 5, a tapered recess is formed on the side opposite to the electric motor in the oil pump 13 that supplies lubricating oil to the compression mechanism as an alternative to the auxiliary fixing member 18 specified in the third and fourth embodiments. And the auxiliary bearing 8 is sandwiched between the fixing members 9. As a result, the same effect as the above embodiment can be obtained without increasing the number of parts.
[0027]
(Example 6)
In FIG. 6, the contact portion between the fixing member 9 and the sub-bearing 8 of the oil pump 13 has a spherical shape or a combination of a spherical shape and a tapered shape. Thereby, an effect equivalent to that of the above embodiment can be obtained.
[0028]
【The invention's effect】
As apparent from the above embodiment, the invention according to claim 1 is characterized in that an electric motor is disposed in the central portion of the sealed container, and a compression mechanism portion driven by the electric motor via a crankshaft is provided on the other side. A hermetic compressor including a sub-bearing that supports the sub-shaft portion of the crankshaft, a fixing member that supports the sub-bearing, and an oil pump that supplies lubricating oil to the compression mechanism portion . The oil pump having a tapered recess on the motor side, a secondary bearing having a spherical corner on the outer periphery on the counter-motor side of the fixed member , and the taper-shaped recess on the counter-motor side; and and characterized by a fixed member by sandwiching the sub-bearing, according to this configuration, when the crank shaft is inclined by the main bearing and the shaft misalignment of the sub-bearing during deflection and assembly, the sub-bearing crankshaft It receives thrust in the thrust direction and tries to incline and follow this, but at this time the contact part of the fixed member that supports the secondary bearing and the secondary bearing is composed of a combination of a spherical shape and a tapered shape, A highly reliable hermetic compressor that is easy to slide and can easily follow the crankshaft, and as a result can be prevented from hitting the countershaft without causing wear or seizure of the countershaft. By assembling to the standard, it becomes possible to assemble easily.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a hermetic compressor in Embodiment 1 of the present invention. FIG. 2 is a partial cross-sectional view of a hermetic compressor in Embodiment 2 of the present invention. FIG. 4 is a partial cross-sectional view of a hermetic compressor according to a fourth embodiment of the present invention. FIG. 5 is a partial cross-sectional view of a hermetic compressor according to a fifth embodiment of the present invention. FIG. 7 is a partial cross-sectional view of a hermetic compressor in Example 6 of the present invention. FIG. 7 is a cross-sectional view of a hermetic compressor of a conventional example.
DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Electric motor part 4 Rotor 5 Stator 6 Crankshaft 7 Main bearing 8 Sub bearing 9 Fixing member 10 Oil sump 11 Suction pipe 12 Discharge pipe 13 Oil pump 14 Discharge side space 15 Communication port 16 Notch Part 17 Sub-bearing side space 18 Auxiliary fixing member

Claims (2)

  An electric motor is disposed in the center of the sealed container, one side is a compression mechanism driven by the electric motor via a crankshaft, and the other side is a sub-bearing that supports the sub-shaft portion of the crankshaft and the sub-bearing. A hermetic compressor including an oil pump for supplying a fixing member and lubricating oil to a compression mechanism, wherein a contact portion of the fixing member with a secondary bearing is recessed in a tapered shape on the motor side, and the anti-motor side of the fixing member A hermetic compressor, wherein a secondary bearing having a spherical shape at the outer peripheral corner is disposed in the oil pump, and the secondary bearing is sandwiched between the oil pump having a tapered recess on the counter-motor side and the fixing member. . The hermetic compressor of claim 1, wherein a contact portion between the sub-bearing of the fixed member and the oil pump is a combination of spherical or spherical shape and a tapered titles.

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