JP3763174B2 - Refrigeration and air conditioning compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for supporting a bearing of a compressor for a refrigerating and air-conditioning used for a commercial and home air conditioner.
[0002]
[Prior art]
FIG. 14 is a cross-sectional view of a typical hermetic horizontal scroll compressor for air conditioning.
[0003]
As shown in FIG. 14 , the orbiting scroll 1 is rotated by a motor 3 so that the fixed scroll 2 is in close contact with the inner and outer surfaces of the scroll blades and supported by the main bearing 4 and the sub-bearing 5 via the crankshaft 6. A turning motion is performed by the prevention mechanism 7.
[0004]
At this time, the scroll compressor forms a compression mechanism by reducing the volume of the crescent-shaped air chamber formed by the contact point of the scroll blade and the blade height from the outside toward the center.
[0005]
Here, as disclosed in JP-A-8-93672, the compression force of the scroll compressor is applied in the vicinity of the end surface of the crankshaft. It was a problem factor such as performance, noise, and vibration.
[0006]
Conventionally, in order to solve this problem, a ball bearing is used for the sub-bearing, and the backlash (angular clearance generated from the radial internal clearance) is used to avoid contact with one piece due to deflection deformation of the crankshaft ( FIGS. 15 and 16 ) . ).
[0007]
In addition, as disclosed in the above-mentioned JP, the supply of lubricating oil to the compression mechanism is improved, and as a countermeasure for avoiding one piece, one of the contact surfaces of the auxiliary shaft and the fixed auxiliary bearing, or It has been considered that both of them have an avoidance shape such as a taper shape or a spherical shape.
[0008]
Alternatively, for the same purpose, a method of supporting the auxiliary shaft via a spherical bearing as disclosed in JP-A-7-317682 has been considered.
[0009]
[Problems to be solved by the invention]
However, when a ball bearing is used as a secondary bearing of a compressor for a refrigerating and air-conditioning, wear and copper plating are likely to occur on the balls and rails, which can cause abnormal noise and increased input, so the reliability of the ball bearing itself is lacking. Further, when the auxiliary shaft and the fixed inner surface of the fixed bearing are processed and supported in the shape of avoiding each piece, the auxiliary shaft and the auxiliary bearing are likely to be in point contact, and there is a concern about wear at the contact portion, and the like. Since it is a cutting process that requires extremely high accuracy, it tends to be expensive. The same is true for spherical bearings, and the bearings themselves can be expensive.
[0010]
Furthermore, compressors for refrigeration and air conditioning, which have been increasing in recent years, are designed to be used from a low frequency range near 10 Hz to a high frequency range exceeding 100 Hz, such as an inverter drive. It is necessary to make the oil supply good in all frequency ranges and to reduce the number of parts as much as possible from the standpoints of assembly and cost.
[0011]
The present invention solves such a problem, and prevents the crankshaft from hitting one side caused by the deflection of the crankshaft due to the compressive force, facilitating the supply of lubricating oil to the compression mechanism, and reliability, performance, The purpose is to provide a low-priced air conditioning compressor bearing support method that excels in noise, vibration and assembly.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention uses a sliding bearing structure for a bearing of a crankshaft and supports the bearing by an elastic body having an automatic alignment function.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1
A compression mechanism for compressing operation via a crank shaft, an electric motor for driving this, is constructed by disposing the oil supply mechanism of the lubricating oil to the compression mechanism, the crank shaft is discharged from the oil supply mechanism A hermetic compressor that has an oil hole for guiding lubricating oil to the compression mechanism inside and is rotatably supported by a main bearing and a sub-bearing arranged with an electric motor interposed therebetween, wherein the sub-bearing is automatic It is supported by an elastic body having a centering function to support the thrust force of the crankshaft, and at the same time, an oil reservoir communicating with the oil hole is integrally formed . It is possible to obtain a compressor for refrigeration and air conditioning with excellent lubrication supply and excellent reliability and performance.
[0027]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
[0028]
Example 1
FIG. 1 is a cross-sectional view of an air-conditioning hermetic horizontal scroll compressor according to the present invention.
[0029]
As shown in the conventional example, the orbiting scroll 1 has a crankshaft 6 supported by a main bearing 4 and a sub-bearing 5 and a rotation prevention mechanism 7 so that the inner surface and the outer surface of the scroll blade are in close contact with the fixed scroll 2. Through the motor 3.
[0030]
At this time, the scroll compressor forms a compression mechanism by reducing the volume of the crescent-shaped air chamber formed by the contact point of the scroll blade and the blade height from the outside toward the center.
[0031]
In FIG. 1, it is assumed that the crankshaft 6 is supported by a main bearing 4 and a sub-bearing 5 which are sliding bearings.
[0032]
As described above, since the gas force is applied in the radial direction near the end surface of the crankshaft due to the compression of the refrigerant by the compression mechanism of the scroll compressor, the crankshaft is flexibly deformed by the amount of the rigidity and the gas force. Therefore, the secondary shaft is deformed in a direction inclined with respect to the internal surface of the secondary bearing.
[0033]
This bending deformation of the crankshaft causes a single contact with the bearing, which can be a cause of abnormal wear of the bearing, resulting in performance deterioration and noise / vibration abnormality due to increased input of the compressor. Become.
[0034]
FIG. 2 is a schematic view showing the auxiliary shaft / sub-bearing structure of this embodiment. Since the auxiliary bearing 5 is supported by an elastic body 8 having an automatic alignment function, the bearing itself is also an auxiliary member as shown in FIG. It will tilt in accordance with the tilt direction of the shaft, and as a result, it will not hit the piece.
[0035]
Further, since the inner surface of the sub-bearing has a sliding bearing structure with respect to the sub-shaft, it comes into surface contact, reduces wear, and is effective for noise and vibration.
[0036]
In addition, since the bearing is supported by an elastic body having a self-aligning function, the center of the crankshaft can be easily centered, and an excellent effect in assembling can be achieved.
[0037]
(Example 2)
FIG. 4 is a diagram in the case where a leaf spring is used for the elastic body having the self-aligning function of this embodiment, and the effect of the first embodiment is obtained in the above-described bearing configuration.
[0038]
Example 3
FIG. 5 is a diagram in the case where a ring-shaped leaf spring is used for the elastic body having the self-aligning function of this embodiment, and the effect of the first embodiment is obtained in the above-described bearing configuration.
[0039]
(Example 4)
FIG. 8 shows a case where a coil spring is used for the elastic body having the self-aligning function of this embodiment, and the effect of the first embodiment is obtained in the above-described bearing configuration.
[0040]
(Example 5)
FIG. 9 is a diagram in the case where an elastically deformable resin material is used for the elastic body having the self-aligning function of the present embodiment, and the effect of the first embodiment is obtained in the above-described bearing configuration.
[0041]
(Example 6)
FIG. 10 is a diagram in the case where an elastic deformable resin material in the form of a ring is used for the elastic body having the self-aligning function of the present embodiment.
[0042]
(Example 7)
FIG. 11 shows the end face of the bearing according to the present embodiment having a rounded shape. This prevents the end face of the bearing and the shaft from being worn and improves reliability, performance, noise, vibration, and assembly. A compressor for refrigeration and air conditioning with an excellent bearing support structure can be obtained.
[0043]
(Example 8)
FIG. 12 shows the end face of the bearing of this embodiment having a tapered shape. This prevents the end face of the bearing and the shaft from being worn, thereby further improving reliability, performance, noise, vibration, and assembly. A compressor for refrigeration and air conditioning with an excellent bearing support structure can be obtained.
[0044]
Example 9
FIG. 13 shows a structure in which the auxiliary bearing of this embodiment supports the thrust force of the crankshaft, has an oil sump, and is supported by an elastic body having a self-aligning function. It is possible to obtain a compressor for refrigerating and air-conditioning with better reliability and performance by improving the supply of lubricating oil to the compression mechanism.
[0057]
【The invention's effect】
As is apparent from the above embodiment, the invention according to claim 1 is provided with a compression mechanism portion that performs a compression operation via a crankshaft, an electric motor that drives the compression mechanism portion, and an oil supply mechanism for lubricating oil to the compression mechanism. In a compressor that is configured, the crankshaft is supported by a main bearing and a sub-bearing that sandwich the electric motor, and the sub-bearing has a self-aligning function and an oil reservoir, and has the function of a thrust bearing that supports the thrust force of the crankshaft. It is characterized by the fact that it is configured to supply lubricating oil intermittently to the compression mechanism through the oil hole inside the crankshaft, which makes the lubricating oil supply to the compression mechanism good, There is an effect of obtaining a refrigeration air-conditioning compressor excellent in performance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a hermetic horizontal scroll compressor for air conditioning according to an embodiment of the present invention. FIG. 2 is a schematic view showing a countershaft / subbearing structure in FIG. 1. FIG. FIG. 4A is a plan view of a counter shaft / sub-bearing showing an embodiment of the present invention when the elastic body is a leaf spring (b). FIG. 5A is a plan view of the auxiliary shaft and the auxiliary bearing showing an embodiment of the present invention when the elastic body is a ring-shaped leaf spring. FIG. FIG. 6A is a plan view of another embodiment of the present invention, FIG. 6B is a perspective view of the relevant part, and FIG. 7C is a perspective view of the relevant part. (A) is a plan view of another embodiment of the present invention (b) is a perspective view of the main part (c) is a perspective view of the main part. FIG. 8 (a) is a book when the elastic body is a coil spring. Deputy showing one embodiment of the invention FIG. 9A is a plan view of the sub-shaft / sub-bearing showing an embodiment of the present invention when the elastic body is an elastically deformable resin material. FIG. 10A is a plan view of the auxiliary shaft and the auxiliary bearing showing an embodiment of the present invention when the elastic body is a ring-shaped elastic deformation resin material. FIG. 11 is a perspective view of the main part. FIG. 11 is a schematic diagram showing the auxiliary shaft / sub-bearing structure showing an embodiment of the present invention in which the end face of the sliding bearing is rounded. FIG. 13 is a schematic view showing a countershaft / subbearing structure showing an embodiment of the present invention in which the bearing end surface is tapered. FIG. 13 is a diagram of the present invention when the thrust force of the crankshaft is supported by the subbearing which is a sliding bearing. FIG. 14 is a sectional view of a conventional scroll compressor. FIG. 15 is a schematic diagram showing the auxiliary shaft / sub-bearing structure in FIG. 12. FIG. 16 is a schematic diagram showing the auxiliary shaft / sub-bearing structure when the crankshaft is deformed in FIG. Explanation】
DESCRIPTION OF SYMBOLS 1 Orbiting scroll 2 Fixed scroll 3 Electric motor 4 Main bearing 5 Sub bearing 6 Crankshaft 7 Rotation prevention mechanism 8 Elastic body 9 Bearing holder 10 Oil reservoir 11 Oil pump cover 12 Oil suction pipe

Claims (1)

A compression mechanism for compressing operation via a crank shaft, an electric motor for driving this, is constituted by disposing the oil supply mechanism of the lubricating oil to the compression mechanism, the crank shaft is discharged from the oil supply mechanism A hermetic compressor that has an oil hole for guiding lubricating oil to the compression mechanism inside and is rotatably supported by a main bearing and a sub-bearing arranged with an electric motor interposed therebetween, and the sub-bearing is automatic A compressor for refrigerating and air-conditioning, which is supported by an elastic body having a centering function and supports thrust force of the crankshaft, and at the same time, an oil reservoir communicating with the oil hole is integrally formed.

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