| Hermetic compressor -> Monitor Keywords |
|
|
 
Hermetic compressorRelated Patent Categories: Pumps, Motor Driven, Common Pump And Motor ChamberHermetic compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060204373, Hermetic compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a hermetic compressor used in refrigeration cycles for such as a refrigerator with freezer. BACKGROUND ART [0002] In recent years, price-reduction of hermetic compressors is remarkable. In addition to implementing cost reduction, reduction of power consumption is further demanded. Reducing the cost involves improving the productivity, and reducing power consumption needs improving the sliding characteristic. To solve these problems, Japanese translation of PCT publication No. 2004-501320 (hereinafter, document 1) discloses a hermetic compressor in which the outer shape of the piston has been improved to reduce a sliding loss between the piston and the cylinder for higher efficiency. Here, improvement of the sliding characteristic mainly means reduction of friction coefficient. [0003] Hereinafter, a description is made for a conventional hermetic compressor mentioned above, referring to drawings. [0004] FIG. 8 is a perspective view of a piston used for the conventional hermetic compressor described in document 1. In FIG. 8, piston 1 includes: sealing surface 3 formed on outer circumferential surface 2 so as to contact the inner circumferential surface of the cylinder; at least two guide surfaces 4 formed on outer circumferential surface 2 so as to contact a part of the inner circumferential surface of the cylinder, and also extending roughly in parallel with the direction of movement of piston 1; and cut portion 5 that does not contact the inner circumferential surface of the cylinder, characterized that the angle 4ab formed with the two lines connecting two boundary edges 4a and 4b of guide surface 4, to cylinder central axis 6 of piston 1, in the radial direction of the piston, is 40.degree. or less, desirably 30.degree. or less. [0005] Next, a description is made for the action of the hermetic compressor mentioned above. [0006] While in operation, piston 1 is moving reciprocally. Near the bottom dead center, a part of the skirt side of piston 1 deviates from the cylinder. Guided by guide surface 4, piston 1 can enter the cylinder smoothly. However, because the above-mentioned conventional piston has cut portion 5, the area on the outer circumferential surface of piston 1, that is closer to the skirt side than sealing surface 3, in other words, the lower side in FIG. 8 is not cylindrical but multilevel. In such a case, a rotative honing stone while processing does not stay stably, and thus a through-feed centerless grinder cannot be used, reducing productivity. [0007] In addition, with the above-mentioned conventional piston, the vertical posture of piston 1 to the cylinder is regulated by the clearance between outer circumferential surface 2 of piston 1 and the inner circumferential surface of the cylinder, only in the short section between the edge of the top surface and the lower edge of sealing surface 3, causing the piston to easily tilt relative to the direction of the cylinder. Consequently, leakage of a large amount of refrigerant decreases the freezing capacity, so does the efficiency. DISCLOSURE OF INVENTION [0008] In a hermetic compressor according to the present invention, at least two grooves are formed on the outer circumferential surface of the piston, where the grooves do not communicate with the top and skirt surfaces of the piston, and at the same time do communicate with the space in the housing at least near the bottom dead center. This makeup stabilizes a rotative honing stone while processing, owing to the outer circumferential surface, substantially cylindrical, on the top and skirt sides of the piston; causes the piston to be resistant to vertically tilting relative to the direction of the cylinder; and supplies the sliding part with oil through the grooves. [0009] The above-mentioned makeup provides a hermetic compressor with high productivity, freezing capacity, and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS [0010] FIG. 1 is a longitudinal sectional view of a hermetic compressor according to the first exemplary embodiment of the present invention. [0011] FIG. 2 is a perspective view of a piston used for the hermetic compressor according to the first exemplary embodiment of the present invention. [0012] FIG. 3 is a characteristic diagram showing the freezing capacity and coefficient of performance (C.O.P.) of the hermetic compressor according to the first exemplary embodiment of the present invention. [0013] FIG. 4 is a longitudinal sectional view of a hermetic compressor according to the second exemplary embodiment of the present invention. [0014] FIG. 5 is a perspective view of a piston used for the hermetic compressor according to the second exemplary embodiment of the present invention. [0015] FIG. 6 is a longitudinal sectional view of a hermetic compressor according to the third exemplary embodiment of the present invention. [0016] FIG. 7 is a perspective view of a piston used for the hermetic compressor according to the third exemplary embodiment of the present invention. [0017] FIG. 8 is a perspective view of a piston used for a conventional hermetic compressor. DETAILED DESCRIPTION OF THE INVENTION [0018] The present invention provides a hermetic compressor with high productivity, and high freezing capacity and efficiency by suppressing leakage of a refrigerant from between the piston and cylinder. [0019] A hermetic compressor according to the present invention can store oil in the housing, and a compression mechanism for compressing a refrigerant gas is housed in the housing. The compression mechanism is provided with: a crankshaft allocated substantially vertically, having a main axis part and a eccentric axis part; a block forming a cylinder; a piston moving reciprocally in the cylinder; a connector for connecting the eccentric axis part with the piston; and an oil supplying structure for supplying the outer circumferential surface of the piston with oil. The piston has an outer circumferential surface formed with grooves that do not communicate with the top and skirt surfaces of the piston, where the grooves communicate with the space in the housing when the piston is positioned near the bottom dead center. Here, the grooves that do not communicate with the top and skirt surfaces of the piston refer to two grooves formed independently each other, on the outer circumferential surface of the piston, but excluding the edges of the top and skirt surfaces. In other words, the grooves are not formed on an area with a predetermined width from the top and skirt surfaces, meaning the outer circumferential shape of the piston is retained. This makeup stabilizes a rotative honing stone while processing, owing to the outer circumferential surface, substantially cylindrical, on the top and skirt sides of the piston. In addition, tilting of the piston in an off-axis direction relative to that of the central axis of the cylinder is regulated on the edges of top surface and on the skirt side, suppressing the tilting. Further, supplying the sliding part with oil through the grooves brings high productivity, freezing capacity, and efficiency. Continue reading about Hermetic compressor... Full patent description for Hermetic compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Hermetic 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. Start now! - Receive info on patent apps like Hermetic compressor or other areas of interest. ### Previous Patent Application: Apparatus for the distribution of pump-fed concrete to a plurality of casting areas Next Patent Application: Drive unit for a motor vehicle Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Hermetic compressor patent info. IP-related news and info Results in 0.84941 seconds Other interesting Feshpatents.com categories: Qualcomm , Schering-Plough , Schlumberger , Seagate , Siemens , Texas Instruments , 174 |
 * Protect your Inventions * US Patent Office filing 
PATENT INFO |
|
