JP2006233883A - Manufacturing method of hermetic rotary compressor - Google Patents

Abstract

An object of the present invention is to suppress distortion of a cylinder inner wall due to bolt tightening in an assembly process of a hermetic rotary compressor.
A cylinder 104 is fastened with an end plate having the same thickness as a main shaft end plate 107 and an auxiliary shaft end plate 108 with a bolt, and an inner diameter finishing process of the cylinder 104 is performed to remove distortion of the cylinder inner wall. Thereby, even if the regular main shaft end plate 107 and auxiliary shaft end plate 108 are fastened with bolts again, distortion of the cylinder inner wall can be suppressed and a highly reliable hermetic rotary compressor can be provided. Is.
[Selection] Figure 1

Description

  The present invention relates to a manufacturing method of a hermetic rotary compressor used in an air conditioner or a refrigeration apparatus, and realizes fastening of a bolt without generating distortion of a cylinder inner wall when assembling and fastening a compression element. It is.

  In a conventional hermetic rotary compressor, the cylinder distortion due to the bolt tightening force generated when the cylinder and the main shaft end plate and auxiliary shaft end plate sandwiching the cylinder are tightened with bolts affects the performance of the compressor. In some cases, the tightening force of the bolt close to the position where the clearance between the roller and the cylinder inner diameter is minimized is reduced, or the bolt has a small nominal diameter (for example, patents). Reference 1).

  FIG. 5 is a partial longitudinal sectional view of the hermetic rotary compressor described in Patent Document 1, and FIG. 6 is a sectional view taken along line AA in FIG.

  5 and 6, the sealed container 101 houses an electric motor 102 and a compression element 103 driven thereby. The compression element 103 accommodates a roller 110 that rotates eccentrically in the cylinder 104 of the cylinder 104 having the connecting pipe insertion hole 105, and sandwiches both end surfaces of the cylinder 104 between the main shaft end plate 107 and the auxiliary shaft end plate 108. The main shaft end plate 107 and the auxiliary shaft end plate 108 are fastened and fixed by bolts 109a and 109b, respectively. At this time, the roller 110 is arranged so as to be eccentrically rotated while maintaining a minute gap with the inner wall surface of the cylinder, and the size of the gap is not constant in the circumferential direction, and is minimized at a certain point on the discharge side. Is set to The minimum gap size is preferably as small as possible in order to increase the efficiency of the compressor.

  The main shaft end plate 107 and the auxiliary shaft end plate 108 close the air chamber of the cylinder 104 to form a compression space, and simultaneously support the crankshaft 111. Further, the spindle end plate 107 is fixed to the sealed container 101 by welding to fix the compression element to the sealed container.

  One end of the crankshaft 111 is connected to the rotor of the electric motor 102, and an eccentric portion provided in the vicinity of the other end is slidably engaged with the roller 110 inside the cylinder cylinder so that the rotational force of the electric motor 102 is increased. Is transmitted to the compression element 103.

  A connecting pipe 106 is press-fitted into the connecting pipe insertion hole 105, and the connecting pipe 106 and the sealed container 101 are sealed by brazing.

  In the conventional hermetic rotary compressor as described above, when the fastening force of the bolts 109a and 109b is insufficient, the stress when the connecting pipe 106 is press-fitted into the cylinder 104 and the connecting pipe 106 and the sealed container 101 are lowered. The main shaft end plate 107 fixed to the sealed container 101 and the cylinder 104 to which the stress acts cause slippage due to stress due to thermal expansion at the time of attachment, and the roller 110 is displaced from the fixed position. There was a risk of misalignment.

  On the other hand, when the fastening force of the bolts 109a and 109b is increased in order to avoid the occurrence of this misalignment, the inner wall of the cylinder 104 is greatly distorted, and as a result, the roller 110 and the cylinder 104 come into contact with each other, and abnormal noise is generated. Depending on the situation, the lock phenomenon may occur.

In order to solve this problem, in Patent Document 1, as shown in FIG. 5, the tightening torque is reduced only for the bolt 109a that is most likely to cause distortion on the inner wall of the cylinder, and the other bolts 109b are sufficiently tightened. The tightening torque is increased in order to exert the force. Further, Patent Document 1 proposes, as another solution, reducing the stress on the cylinder during tightening by using only the bolt 109a as a bolt having a small nominal diameter.
JP 2002-098075 A

  However, in the conventional configuration, when the main shaft end plate and the auxiliary shaft end plate are fastened to the cylinder, it is necessary to fasten the bolts with different torques, and there is a problem that manufacturing management becomes complicated. Further, when bolts having different nominal diameters are used, there is a problem that the number of types of bolts increases and management becomes complicated.

  The present invention solves such a conventional problem, and when a cylinder-type end plate having the same thickness as that of the main shaft end plate and the auxiliary shaft end plate is assembled and manufactured in advance. An object of the present invention is to provide a method for manufacturing a hermetic rotary compressor in which a bolt is fastened with the same tightening torque and the inner diameter of the cylinder is finished, and distortion of the inner wall of the cylinder due to the fastening of the bolt is suppressed.

  In order to solve the above-described conventional problems, a method for manufacturing a hermetic rotary compressor according to the present invention uses a cylinder inner diameter processing end plate having the same thickness as a main shaft end plate and an auxiliary shaft end plate in advance. Bolts are fastened with the same tightening torque as when the rotary compressor is assembled and manufactured, and the inner wall of the cylinder distorted by tightening the bolts is subjected to cylinder bore finishing.

  As a result, the distortion of the inner wall of the cylinder due to the bolt tightening is eliminated, and the cylinder that has been previously tightened with the bolt, the spindle end plate, and the cylinder inner end machining end plate with the same thickness as the auxiliary shaft end plate are removed, and the normal spindle Even if the end plate and the auxiliary shaft end plate are tightened with bolts, the distortion of the inner wall of the cylinder can be suppressed.

  The manufacturing method of the hermetic rotary compressor of the present invention can suppress distortion of the inner wall of the cylinder, and can provide a highly reliable hermetic rotary compressor. In addition, even if the minimum gap size is made smaller, interference between the cylinder inner diameter and the roller can be prevented, and the amount of gas in the compression stroke leaking into the suction stroke through the gap between the roller and the cylinder inner diameter can be reduced. The compression efficiency during machine operation can be improved.

  In the invention of the present application, the cylinder inner diameter machining end plate having the same thickness as the main shaft end plate and the auxiliary shaft end plate is fastened with a bolt in advance, and the cylinder inner wall is distorted by tightening the bolt to finish the inner diameter of the cylinder. By performing the processing, the distortion of the cylinder inner wall can be removed. Thereby, even if the minimum gap size is made smaller, the cylinder inner diameter and the roller can be prevented from interfering with each other, and the amount of gas in the compression stroke leaking into the suction stroke through the gap between the roller and the cylinder inner diameter is reduced. It is possible to improve the compression efficiency during the operation of the compressor.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of a hermetic rotary compressor according to Embodiment 1 of the present invention.

  In FIG. 1, an electric motor 102 in a sealed container 101, a crankshaft 111 driven by the electric motor 102, a roller 110 driven by the crankshaft 111, a cylinder 104 storing the roller 110, A partition plate (not shown) that contacts the roller 110 and partitions the cylinder cylinder, and a spindle end plate that is disposed at both ends of the cylinder 104 and fastened by a plurality of bolts 19a and 19b and that supports the crankshaft 111. 107 and an auxiliary shaft end plate 108.

  FIG. 2 is a cross-sectional view of the compression mechanism section, in which the cylinder 104 is fastened with a main shaft end plate and an auxiliary shaft end plate with a plurality of bolts, and shows that the cylinder inner wall is distorted.

  A cylinder inner diameter machining end plate having the same thickness as that of the main shaft end plate and the auxiliary shaft end plate is fastened to the cylinder with a bolt, the inner diameter finishing of the cylinder is performed, and the cylinder inner wall distorted by bolt tightening is removed.

  According to the above configuration, even if the cylinder 104 is retightened to the regular main shaft end plate 107 and the auxiliary shaft end plate 108 with the bolts 19a and 19b, distortion of the cylinder inner wall can be suppressed, and a highly reliable sealed type. A rotary compressor can be provided.

  In addition, even if the minimum clearance dimension is made smaller, interference between the cylinder inner diameter and the roller 110 can be prevented, and the amount of gas during the compression stroke leaking into the suction stroke through the gap between the roller 110 and the cylinder inner diameter can be reduced. Thus, it is possible to improve the compression efficiency during the operation of the compressor.

(Embodiment 2)
FIG. 3 is a cross-sectional view of a main part of the hermetic rotary compressor according to the second embodiment of the present invention. In FIG. 3, the same components as those in FIG.

  In FIG. 3, the plurality of bolts are obtained by fastening the spindle end plate and the cylinder via the muffler 112. By using the muffler 112, the cost of the bolt to the cylinder is shortened, so that the distortion of the cylinder inner wall is increased.

  The cylinder end plate and the cylinder inner end machining end plate having the same thickness as the muffler 112 are fastened to the cylinder with bolts, the inner diameter finishing of the cylinder is performed, and the cylinder inner wall distorted by bolt tightening is removed.

  According to the above configuration, it is possible to suppress the distortion of the inner wall of the cylinder even if the cylinder is retightened to the main spindle end plate and the muffler 112 with a bolt again, and a highly reliable hermetic rotary compressor is provided. Can do.

  In addition, since the gap can be reduced by closely contacting the muffler 112 and the spindle end plate, noise due to gas leakage from the gap can be reduced.

(Embodiment 3)
FIG. 4 is a cross-sectional view of a main part of the hermetic rotary compressor according to the third embodiment of the present invention. 4, the same components as those in FIGS. 1 and 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 4, the plurality of bolts are obtained by fastening the auxiliary shaft end plate and the cylinder via a muffler. By using the muffler, the cost of the bolt to the cylinder is shortened, so that the distortion of the inner wall of the cylinder increases.

  A cylinder inner diameter machining end plate having the same thickness as the auxiliary shaft end plate and the muffler is fastened to the cylinder with a bolt, the inner diameter finishing of the cylinder is performed, and the cylinder inner wall distorted by bolt tightening is removed.

  According to the above configuration, it is possible to suppress the distortion of the inner wall of the cylinder even if the cylinder is retightened to the regular auxiliary shaft end plate and the muffler with a bolt, and a highly reliable hermetic rotary compressor is provided. Can do.

  As described above, the method for manufacturing a hermetic rotary compressor according to the present invention can suppress distortion of the inner wall of the cylinder, so that not only a single-cylinder hermetic rotary compressor is manufactured but also a multi-cylinder hermetic rotary compressor. It can also be applied to uses such as manufacturing a compressor.

Partial sectional view of a hermetic rotary compressor according to Embodiment 1 of the present invention. 1 is a cross-sectional view of the compression mechanism portion of FIG. Partial sectional view of a hermetic rotary compressor according to Embodiment 2 of the present invention. Partial sectional view of a hermetic rotary compressor according to Embodiment 3 of the present invention Partial sectional view of a conventional hermetic rotary compressor AA cross-sectional arrow view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 102 Electric motor 103 Compression element 104 Cylinder 105 Connection pipe insertion hole 106 Connection pipe 107 Main shaft end plate 108 Auxiliary shaft end plate 109a Bolt 109b Bolt 19a Bolt 19b Bolt 110 Roller 111 Crankshaft 112 Muffler

Claims (3)

A method of manufacturing a hermetic rotary compressor in which a cylinder and a main shaft end plate and an auxiliary shaft end plate forming a compression space by sandwiching the cylinder are fixed with bolts, the cylinder being connected to the main shaft end plate and A manufacturing method of a hermetic rotary compressor, wherein an end plate having the same thickness as that of an auxiliary shaft end plate is fastened with a bolt, and the inner diameter of the cylinder is finished. A main shaft end plate and an auxiliary shaft end plate that sandwich the cylinder to form a compression space, and a muffler disposed on the opposite side of the main shaft end plate are fixed with bolts, and the main shaft end plate A part of the bolt for fixing the main shaft end plate to the cylinder together with the muffler, and the rest is a method for manufacturing a hermetic rotary compressor in which only the main shaft end plate and the cylinder are fixed, A manufacturing method of a hermetic rotary compressor, wherein an end plate having the same thickness as that of a muffler is fastened with a bolt, and the inner diameter of the cylinder is finished. A cylinder, a main shaft end plate, an auxiliary shaft end plate, and a muffler disposed on the side opposite to the cylinder of the auxiliary shaft end plate are fixed with bolts to sandwich the cylinder and form a compression space. A part of the bolt for fixing the end plate fixes the auxiliary shaft end plate to the cylinder together with the muffler, and the rest is a manufacturing method of a hermetic rotary compressor in which only the auxiliary shaft end plate and the cylinder are fixed. A manufacturing method of a hermetic rotary compressor, wherein an end plate having the same thickness as that of an auxiliary shaft end plate and a muffler is fastened with a bolt, and the inner diameter of the cylinder is finished.

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