JP3876670B2 - Manufacturing method of hermetic compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a refrigerant compressor having a two-bearing structure used in a refrigeration air conditioner or the like.
[0002]
[Prior art]
As compressors for refrigerating and air conditioning, there are reciprocating type, rolling piston type and scroll type compression mechanisms, and any method is used in the field of refrigerating and air conditioning for home use and business use. Here, a conventional technique will be described by taking a scroll compressor as an example.
[0003]
FIG. 3 is a longitudinal sectional view of a conventional scroll compressor. Inside the hermetic container 1, a compression mechanism 2 and a bearing part 3 are provided at the upper part, which are engaged with a fixed scroll 2 a and a movable scroll 2 b that orbits with respect to the fixed scroll 2 a. Then, the eccentric bearing 2 c of the movable scroll 2 b is rotatably inserted into the eccentric shaft 4 a at the end of the shaft 4, and the movable scroll 2 b is turned by the rotational movement of the shaft 4.
[0004]
A rotor 5 a of an electric motor 5 is attached to the shaft 4, and is disposed below the bearing component 3 together with a stator 5 b that is shrink-fitted and fixed to the sealed container 1. The main bearing 6 is formed by press-fitting an annular bushing material into the bearing component 3 and supports the radial force acting on the shaft 4. An oil sump 8 for storing lubricating oil 7 is provided at the bottom of the closed container 1.
[0005]
In addition, a refrigerant gas suction pipe 9 is provided at a side portion of the hermetic container 1 to introduce the refrigerant gas into the compression mechanism 2. The gas pressure on the compression side acts inside the sealed container 1. The counter shaft 4c on the opposite side of the compression mechanism 2 of the shaft 4 is supported by a deep groove ball bearing 10, and the deep groove ball bearing 10 is fitted and fixed to a sub bearing holder 11 which is fixed to the hermetic container 1 by welding. . The sub-bearing holder 11 is attached to a sub-bearing holding plate 12 that is hermetically fixed to the sealed container 1 by welding or the like, and has a two-bearing structure with the main bearing 6 and the motor 5 of the upper bearing part 3 interposed therebetween.
[0006]
When the sub-bearing holding plate 12 is fixed while being inclined with respect to the axis of the main bearing 6, the auxiliary bearing holder 11 attached thereto is assembled while being inclined with respect to the axis of the main bearing 6. The shaft 4 is assembled without the main bearing 6 being twisted by using the deep groove ball bearing 10 which can rotate even if the inner ring and the outer ring are inclined with respect to the inclination of the axis of the main bearing 6 and the auxiliary bearing holder 11. .
[0007]
Further, a spherical bearing is adopted as the secondary bearing (see Japanese Patent Laid-Open No. 6-221280), or the secondary bearing member is tiltably supported (see Japanese Patent Laid-Open No. 8-31542), or the secondary bearing holding plate 12 or The structure which accept | permits the inclination of the subbearing holder 11 is disclosed. A trochoid pump 13 is disposed at the end of the shaft 4 so that the rotation of the rotor 5a is transmitted by the shaft 4.
[0008]
Further, the shaft 4 is provided with a through hole 14 for supplying the lubricating oil 7 sucked up by the trochoid pump 13 to each bearing portion, that is, the main bearing 6, the eccentric bearing 2c, and each sliding surface, and is lubricated from the lower end of the shaft 4. Oil 7 is sucked up. Reference numeral 15 denotes a discharge pipe for discharging compressed gas to the outside of the sealed container 1. Reference numeral 16 denotes a check valve for preventing the movable scroll 2b from rotating in the reverse direction, and reference numeral 17 denotes an Oldham ring for preventing the rotation of the movable scroll 2b so that the movable scroll 2b is turned relative to the fixed scroll 2a.
[0009]
Next, the operation of the compression mechanism comprising the above mechanism will be described. The low pressure gas returns from the suction pipe 9 and is sucked into the compression mechanism 2. By rotating the movable scroll 2b so as not to rotate with respect to the fixed scroll 2a, a plurality of compression spaces formed between the fixed scroll 2a and the movable scroll 2b are gradually reduced from the outside toward the inside and compressed. Is done.
[0010]
The compressed gas becomes a high-pressure gas, and is once discharged to the muffler 18 and then discharged from the closed vessel 1 to the outside of the closed vessel 1 through the discharge pipe 15, and the low-pressure gas is circulated again to constitute a known compression cycle. . On the other hand, the lubricating oil 7 sucked up by the shaft 4 rises in the through hole 14 of the shaft 4, lubricates and cools the eccentric bearing 19, the main bearing 6 and the sliding portions, and is disposed on the shaft 4. In addition, a lubrication cycle is formed which is discharged from the minute cutout 4b and returns to the oil sump 8 through the communication hole 20 of the rotor 5a.
[0011]
[Problems to be solved by the invention]
However, in the above conventional configuration, it is difficult to fix the auxiliary bearing holding plate to which the auxiliary bearing holder is attached to the sealed container without tilting with respect to the axis of the main bearing. However, there is a problem that the driving force is increased due to the contact with the shaft, the input of the compressor is increased, and the oil film is easily cut, so that the reliability is lowered.
[0012]
As a countermeasure against this, a sub-bearing member with an allowable inclination is indispensable. However, deep groove ball bearings that can rotate even when the inner and outer rings are inclined are more expensive than sliding bearings, making it difficult to provide an inexpensive compressor. In addition, even in the configuration in which the spherical bearing and the sub-bearing member can be tilted, related parts are expensive or the number of parts increases, which is similarly an obstacle to providing an inexpensive compressor. Further, in the deep groove ball bearing, when the inclination of the inner ring and the outer ring occurs, there is a problem that the rolling trajectory of the ball becomes an ellipse and the speed of the rolling changes, so that noise increases.
[0013]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a highly reliable compressor at a low cost by allowing the auxiliary bearing to be inclined with an easy configuration.
[0014]
[Means for Solving the Problems]
In order to solve the above problems, the present invention of claim 1 is configured such that the axis of the auxiliary bearing and the mounting surface to the auxiliary bearing holding plate are inclined, and the axis of the main bearing is adjusted by rotating the auxiliary bearing. The auxiliary bearings are assembled with their axes substantially parallel. By this manufacturing method, the axis of the secondary bearing and the axis of the main bearing can be made substantially parallel, so even if an inexpensive sliding bearing is used for the secondary bearing, the inclination of the main bearing and the shaft can be reduced to reduce the tilt of the main bearing and the shaft. Problems such as an increase in compressor input and a decrease in reliability can be overcome. Further, in the case of a deep groove ball bearing, the rolling surface becomes a substantially perfect circle and the change in the rolling speed becomes small, so that noise can be suppressed.
[0015]
Further, in order to solve the above problems, the present invention of claim 2 is configured such that the axis of the sub-bearing and the mounting surface to the sub-bearing holding plate are inclined, and the inclination that offsets the inclination of the sub-bearing holding plate is reduced. The auxiliary bearing is selected and assembled so that the axis of the main bearing and the axis of the auxiliary bearing are substantially parallel.
[0016]
By this manufacturing method, the axis of the secondary bearing and the axis of the main bearing can be made substantially parallel, so even if an inexpensive sliding bearing is used for the secondary bearing, the inclination of the main bearing and the shaft can be reduced to reduce the tilt of the main bearing and the shaft. Problems such as an increase in compressor input and a decrease in reliability can be overcome. Further, in the case of a deep groove ball bearing, the rolling surface becomes a substantially perfect circle and the change in the rolling speed becomes small, so that noise can be suppressed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a shaft that includes a drive element and a compression mechanism that compresses and discharges the refrigerant that is driven by the drive element and sucked from outside is provided in the sealed container, and connects the drive element and the compression mechanism. Is a hermetic compressor that is rotatably supported by a secondary bearing on the opposite side across the main bearing and driving element of the compression mechanism, and is configured such that the axis of the secondary bearing and the mounting surface to the secondary bearing holding plate are inclined. Thus, the auxiliary bearing is rotated and adjusted to assemble the main bearing axis and the auxiliary bearing axis in parallel.
[0018]
Thus, the axis of the auxiliary bearing and the mounting surface to the auxiliary bearing holding plate are inclined, and even if the auxiliary bearing holding plate is inclined with respect to the axis of the main bearing by adjusting the rotation of the auxiliary bearing, The axis of the main bearing and the auxiliary bearing can be made substantially parallel. Therefore, it is possible to realize an inexpensive and highly reliable compressor without using an expensive deep groove ball bearing as a secondary bearing and without problems such as increased input or reduced reliability due to a single bearing even if a sliding bearing is used. I can do it.
[0019]
Furthermore, the present invention of claim 2 comprises a driving element and a compression mechanism that compresses and discharges the refrigerant that is driven by the driving element and sucked from outside in the sealed container, and connects the driving element and the compression mechanism. Is a hermetic type compressor that rotatably supports a shaft to be driven by a secondary bearing on the opposite side across the main bearing and driving element of the compression mechanism, and has a configuration in which the axis of the secondary bearing and the mounting surface to the secondary bearing holding plate are inclined The auxiliary bearing having an inclination that cancels the inclination of the auxiliary bearing holding plate is selected and assembled so that the axis of the main bearing and the axis of the auxiliary bearing are substantially parallel.
[0020]
In this way, even if the sub-bearing holding plate is attached with an inclination to the axis of the main bearing, the main bearing and the sub-bearing can be selected by selecting a sub-bearing having an inclination that cancels the inclination of the sub-bearing holding plate. Can be made substantially parallel. Therefore, it is possible to realize an inexpensive and highly reliable compressor without using an expensive deep groove ball bearing as a secondary bearing and without problems such as increased input or reduced reliability due to a single bearing even if a sliding bearing is used. I can do it.
[0021]
Several embodiments of the present invention will be described below with reference to the drawings.
[0022]
(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to the first embodiment of the present invention. The configuration of the compressor shown in FIG. 1 is the same as that of the conventional scroll compressor detailed in FIG. 3 , and the same reference numerals are used for the same functional parts. Also, the description of the same configuration and operation as in the conventional example is omitted.
[0023]
The sub-bearing holding plate 12 is fixed to the sealed container 1 by a method such as welding or shrink fitting, but since it uses heat, it is tilted and fixed. The secondary bearing holder 21 having the secondary bearing axis 21b and the inclination 21c attached to the secondary bearing holding plate 12 is attached to the secondary bearing holding plate 12, but the bolt mounting holes are formed in the shape of elongated holes on concentric circles. The auxiliary bearing holder 21 is assembled by adjusting the rotation so that the inclination of the auxiliary bearing holding plate 12 is offset, and the axis of the auxiliary bearing holder 12 is adjusted and assembled substantially in parallel. In the figure, at the rotational position (a), the inclination of the auxiliary bearing holding plate 12 and the inclination of the auxiliary bearing holder 21 are offset, and the axis line 21b of the auxiliary bearing and the axis line of the main bearing 6 are substantially parallel.
[0024]
Therefore, since the contact between the shaft 4 and the main bearing 6 and the auxiliary bearing 22 and the auxiliary shaft 4c can be avoided, the compressor input due to the increase of the driving force does not increase, and the oil film is hardly cut off. And a highly reliable compressor can be provided. However, when mounted at the position (b) in FIG. 1 (± 90 ° rotation from position a) and position c) (rotation 180 degrees from position a), the tilt of the secondary bearing holder 21 is offset. Therefore, the axis 21b of the main bearing 6 and the auxiliary bearing cannot be made parallel. Further, in the present embodiment, the auxiliary bearing 22 is a sliding bearing, so that it is quiet. Further, in addition to the reduction of the number of parts and the cost reduction, and the adjustment and assembly of the auxiliary bearing holder 21 are easy, it is possible to provide a compressor that is quiet and inexpensive with high efficiency and reliability.
[0025]
(Embodiment 2)
FIG. 2 is a longitudinal sectional view of a scroll compressor according to the second embodiment of the present invention. The configuration of the compressor shown in FIG. 2 is the same as that of the conventional scroll compressor detailed in FIG. 3 , and the same reference numerals are used for the same functional parts. Also, the description of the same configuration and operation as in the conventional example is omitted.
[0026]
The sub-bearing holding plate 12 is fixed to the sealed container 1 by a method such as welding or shrink fitting, but since it uses heat, it is tilted and fixed. The sub-bearing holder 21 is attached to the sub-bearing holding plate 12 with the mounting surface 21a having the inclination 21c and the axis 21b of the sub-bearing. At this time, the offset is measured after measuring the inclination of the sub-bearing holding plate 12. By selecting and assembling the sub-bearing holder 21 having the inclination to be offset, the inclination of the sub-bearing holding plate 12 is offset with higher accuracy, and the axis with the main bearing 6 is assembled in a substantially parallel manner.
[0027]
When “i” and “c” are selected in the lower secondary bearing holder 21 in FIG. 2 , the inclination of the secondary bearing holding plate 12 and the inclination 21 c of the axis 21 b of the secondary bearing holder 21 and the mounting surface 21 a are inconsistent, and the main bearing 6 and the secondary bearing 22. The auxiliary shaft 4c of the shaft 4 and the sub-bearing 22 are caused to come into contact with each other. However, when selecting and assembling, the sub-bearing holding plate 12 and the sub-bearing holder 21 are inclined. Since they coincide with each other, the axes of the main bearing 6 and the auxiliary bearing 22 can be made substantially parallel.
[0028]
Therefore, since the contact between the shaft 4 and the main bearing 6 and the auxiliary bearing 22 and the auxiliary shaft 4c can be avoided, the compressor input due to the increase of the driving force does not increase, and the oil film is hardly cut off. And a highly reliable compressor can be provided. Further, in the present embodiment, the auxiliary bearing 22 is a sliding bearing, so that it is quiet. Further, in addition to the reduction in the number of parts and cost reduction, and the adjustment and assembly of the auxiliary bearing holder 21 are easy, it is possible to provide a quieter and cheaper compressor with higher efficiency and reliability.
[0029]
In these embodiments, the secondary bearing holder with the inclined mounting surface to the auxiliary bearing holding plate has been described, but the auxiliary bearing holder whose mounting surface to the auxiliary bearing holding plate is perpendicular to the axis of the auxiliary bearing has both sides. The same effect can be obtained by assembling the auxiliary bearing holding plate with the inclined flat plate interposed therebetween. Although the scroll compressor has been described, the same applies to other types of compressors.
[0030]
【The invention's effect】
As described above, according to the invention described in claim 1 , the axis of the auxiliary bearing and the mounting surface to the auxiliary bearing holding plate are inclined, and the axis of the main bearing and the auxiliary bearing are adjusted by rotating the auxiliary bearing. As a result, the auxiliary bearing holding plate and the main bearing axis are inclined and fixed, so that the mounting surface of the auxiliary bearing holder to the auxiliary bearing holding plate and the auxiliary bearing axis are inclined. Therefore, the axis of the main bearing and the sub-bearing can be made approximately parallel by rotating the sub-bearing holding plate, and even if the sliding sub-bearing is adopted, the driving force increases due to the contact of the sub-shaft and the reliability due to the oil film breakage. An advantageous effect is obtained in that an inexpensive compressor without the problem of lowering can be manufactured.
[0031]
According to the second aspect of the invention, since the axis of the auxiliary bearing and the mounting surface to the auxiliary bearing holding plate are inclined, the auxiliary bearing is supported even if the axis of the auxiliary bearing holding plate and the main bearing is inclined and fixed. Since the secondary bearing with the inclination that cancels the inclination of the holding plate is selected and the axis of the main bearing and the axis of the auxiliary bearing are roughly parallel to each other, even if a sliding auxiliary bearing is used, An advantageous effect is obtained in that an inexpensive compressor free from problems such as an increase in driving force and a decrease in reliability due to oil film breakage can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the vicinity of a sub-bearing in the first embodiment and a cross-sectional view when the sub-bearing holder is rotated. FIG. 2 is a cross-sectional view in the vicinity of a sub-bearing in the second embodiment and a cross-sectional view of the sub-bearing holder. [Fig. 3 ] Vertical section of a conventional scroll compressor [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Bearing parts 5 Electric motor 6 Main bearing 10 Deep groove ball bearing 11 Sub bearing holder 12 Sub bearing holding plate 19 Eccentric bearing 21 Sub bearing holder 21a Mounting surface 21b Sub bearing axis 21c Inclination 22 Sub bearing

Claims (2)

The airtight container includes a driving element and a compression mechanism that compresses and discharges the refrigerant driven by the driving element and sucked from outside, and the shaft that connects the driving element and the compression mechanism is connected to the main bearing and the drive of the compression mechanism. A method of manufacturing a hermetic compressor that is rotatably supported by an auxiliary bearing on the opposite side across an element,
Rotate the sub-bearing whose angle between the mounting surface to the sub-bearing holding plate and the axis is inclined from the vertical direction while sliding the mounting surface against the sub-bearing holding plate, and the axis of the main bearing and the sub-bearing becomes approximately parallel. A method of manufacturing a hermetic compressor, wherein the assembly is fixed and assembled at a certain position. The airtight container includes a driving element and a compression mechanism that compresses and discharges the refrigerant driven by the driving element and sucked from outside, and the shaft that connects the driving element and the compression mechanism is connected to the main bearing and the drive of the compression mechanism. A method of manufacturing a hermetic compressor that is rotatably supported by an auxiliary bearing on the opposite side across an element,
Prepare multiple types of sub-bearings where the angle between the mounting surface of the sub-bearing holding plate and the axis is inclined from the vertical direction, and offset the deviation of the mounting angle of the sub-bearing holding plate to the sealed container from the multiple types of sub-bearings A method of manufacturing a hermetic compressor, wherein a sub-bearing having an inclination is selected, and the main bearing and the sub-bearing are arranged in substantially parallel axes.

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