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Hermetic type compressorRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Reciprocating Rigid Pumping MemberHermetic type compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070020127, Hermetic type compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of priority under 35 U.S.C. .sctn. 119 to Korean Patent Application No. 2005-57558, filed on Jun. 30, 2005, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a hermetic type compressor, and more particularly, to a fixing bolt coupling structure for coupling a cylinder head with a cylinder. [0004] 2. Description of the Related Art [0005] Generally, a hermetic type compressor is employed in the refrigeration cycle of a refrigerator, an air conditioner, or the like, and compresses refrigerant. The hermetic type compressor includes a compression part provided in a sealed container to compress the refrigerant and a driving part for supplying driving force to compress the refrigerant. The compression part and the driving part are installed using a frame. [0006] According to the conventional hermetic type compressor, the cylinder may be formed with bolt fastening holes and fixing bolts screwed in the bolt fastening holes. The bolt fastening holes and the fixing bolts are sometimes made of different materials. Therefore, when the cylinder and the fixing bolts are heated by compression heat generated during the compression of the refrigerant, they thermally expand at different rates. For this reason, the fastening force between the bolt fastening holes and the fixing bolts is weakened. [0007] In other words, when heat of the compression chamber in which the refrigerant is compressed or the refrigerant discharge chamber receiving the high-temperature and high-pressure refrigerant discharged from the compression chamber is transferred to the cylinder, the cylinder is expanded at a higher thermal expansion rate than the fixing bolts. As a result, distances between the inner circumferences of the bolt fastening holes and the outer circumferences of the fixing bolts increase, which causes the fastening force between the bolt fastening holes and the fixing bolts to decrease. Moreover, reduction of the fastening force of the fixing bolts reduces the coupling force of coupling the cylinder head with the cylinder so that the performance of the compressor is deteriorated because the compression chamber is not sufficiently sealed. SUMMARY OF THE INVENTION [0008] The present invention has been made in view of the above-mentioned problems, and an aspect of the invention is to provide a hermetic type compressor in which the fastening force of fixing bolts screwed in a cylinder to couple a cylinder head to the cylinder is prevented from deteriorating due to the compression heat of refrigerant. [0009] To this end, one non-limiting aspect of the present invention provides a hermetic compressor, comprising a cylinder having a compression chamber; a cylinder head coupled to the cylinder to seal the compression chamber at least one fastener coupling the cylinder head to the cylinder, the at least one fastener being made at least in part of a material having a thermal expansion coefficient less than that of the cylinder at least one fastening hole, formed in the cylinder, configured to receive the at least one fastener and at least one bush configured to be disposed between the at least one fastener and the at least one fastening hole and made at least in part of a material having a thermal expansion coefficient greater than that of the cylinder. [0010] Another non-limiting aspect of the present invention provides a hermetic type compressor that includes: a cylinder having a compression chamber; a cylinder head configured to be coupled with the cylinder to seal the compression chamber; and a plurality of fixing bolts configured to be fastened into a plurality of bolt fastening holes formed in the cylinder head to couple the cylinder head with the cylinder, wherein the plurality of fixing bolts are made at least in part of a material having a thermal expansion coefficient greater than a thermal expansion coefficient of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS [0011] These and other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: [0012] FIG. 1 is an elevational view of a hermetic type compressor in section according to a non-limiting embodiment of the present invention; [0013] FIG. 2 is an exploded perspective view of a cylinder head and a valve device separated from a cylinder of the hermetic type compressor according to a non-limiting embodiment of the present invention; [0014] FIG. 3 is an enlarged perspective view of the portion "A" of FIG. 2; [0015] FIG. 4 is a partial elevational view in section of the cylinder head and the valve device assembled with the cylinder of the hermetic type compressor according to a non-limiting embodiment of the present invention and further illustrating a state before compression heat of refrigerant is transferred to the cylinder; [0016] FIG. 5 is an enlarged elevational view in section of the cylinder head and the valve device assembled with the cylinder of the hermetic type compressor according to a non-limiting embodiment of the present invention and further illustrating the state in which compression heat of refrigerant has been transferred to the cylinder; [0017] FIG. 6 is a partial perspective view illustrating non-limiting configurations of a bush and a bolt coupling hole of a hermetic type compressor according to another non-limiting embodiment of the present invention; and [0018] FIG. 7 is a partial elevational view in section illustrating the coupling structure of a cylinder head and a cylinder in the hermetic type compressor according to another non-limiting embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS [0019] Hereinafter, the non-limiting embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals illustrate like elements. Continue reading about Hermetic type compressor... Full patent description for Hermetic type compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Hermetic type compressor patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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