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CompressorRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Reciprocating Rigid Pumping MemberCompressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070081908, Compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a compressor having an improved oil feeding means. BACKGROUND ART [0002] In recent years, responding to the requirement for global environment, energy saving movement in home use refrigerator is accelerated. Therefore, coolant compressor is made to be an inverter type, and greater efforts are given on lowering the rotation rate further. For such the low rotation rate compressor, by a centrifugal pump such as of prior art that was described in "National publication (in the Japanese) of translation of international patent application 2002-519589", it became difficult to obtain an ample oil feeding. [0003] As for a compressor of prior art, in place of a conventional centrifugal pump, there is the one that is provided with a viscous pump by which a stable pumping capability is obtainable with less effort. [0004] In the following, referring to drawings, explanation is given on the above-mentioned compressor of prior art. [0005] FIG. 7 is a cross-sectional drawing of a main part of the above-mentioned compressor of prior art. Referring to FIG. 7, a hermetic container 1 stores oil 2 in its bottom part. An electric motor 5 is composed of a stator 6 having a coil, and a rotor 7 including a permanent magnet within it. On the outer periphery of a hollow shaft 11 provided in a compressor unit 10, sleeve 12 is fit and fixed so that it rotates integrally with the shaft 11. Further, on the outer periphery of the sleeve 12, the rotor 7 is inserted and fixed. And the bottom end of the sleeve 12 is immersed in the oil 2. [0006] A bracket 15 formed in an approximately U-letter shape with a thread of piano wire is fixed at its both ends to a bottom plate 16 that is fixed to the rotor 7 of the motor 5. The sleeve 12 is made of plastic material, in which a rod 20 with a helical thread 20' formed on its outer periphery is inserted in rotation-free manner. Between outer peripheral surface of the rod 20 and inner surface of the sleeve 12 facing to the outside of the rod 20 via a narrow gap, an oil channel is formed. The bottom end of the rod 20 is fixed to the central part of the bracket 15 so that the rod 20 remains at rest within the sleeve 12 even when the sleeve 12 rotates together with the shaft 11 as a single unit. [0007] The compressor of prior art constituted as described above operates as follows; [0008] Upon electrifying the motor 5, its rotor 7 rotates. Therefore, the shaft 11 which is fit and fixed to the rotor 7 forming a single unit also rotates. By this rotation of the shaft 11, the compressor unit 10 performs its prescribed compressor action. And when the sleeve 12 rotates by the rotation action of the shaft 11, the inner wall of the sleeve 12 becomes to rotate with respect to the outer wall of the rod 20. As a result, oil 2 receives a rotating force and is dragged by the viscosity existing in the relative rotation between the sleeve 12 and the rod 20 within the oil channel formed between the helical thread 20' formed on the outer periphery of the rod 20 and the inner wall of the sleeve 12. That is, due to the relative rotation of the sleeve 12, oil layer contacting its inner surface provides a rotating force due to the viscosity to oil layer on the rod surface as well as in the above-mentioned helical thread 20', then this rotating force drags the oil in the channel along the helix so as to let it being rotated and moved upward. The oil moved upward inside the sleeve 12 is pumped up toward the upper hollow part of the shaft 11 via a horizontal hole in the shaft 11 and through the vertical hole in the center shaft part of the shaft 11. This upward movement of the oil 2 toward the upper hollow part of the shaft 11 is not caused by the centrifugal force, but it is due to the action of rotating upward movement by a force dragged by the viscosity, thereby a stable oil pumping-up at a low rotating rate at which the centrifugal force is small can be achieved. DISCLOSURE OF INVENTION [0009] However, in the configuration of the above-mentioned example of the prior art, the structure is such that the bracket 15 made of wire holds and fixes the rod 20. Therefore, when the dimensional accuracy of the bracket 15 is low, good coaxial relationship between the outer wall of the rod 20 and the wall of the sleeve 12 is not maintained, the rod 20 is forced on some parts of the inner wall somewhere of the sleeve 12 and causes undesirable contact on the sleeve 12. In order to absorb the occurrence of a large frictional force due to this contact, the bracket 15 is designed to be formed of elastic material. When the contact force is large, however, an extraordinary abrasion takes place between the sleeve 12 and the rod 20, and the pump capability declines, or abrasion particles are produced, which are circulating over the sliding-motion part together with oil and entering into the sliding-motion part, spoiling the operation of the compressor unit seriously and moreover there was a shortcoming that is even to lock the compressor unit. [0010] Also, the rod 20 requires a mold, which necessitates a complicated process in its manufacturing period to form a helical groove on its whole outer peripheral surface, and hence there was a shortcoming that causes the rise of cost of the compressor. [0011] The present invention purposes to provide a compressor that is highly reliable and does not require any marked high cost in its manufacturing. [0012] To solve the above-mentioned problem of the prior art, an oil pump of a compressor of the present invention is provided with a helical groove engraved helically on the outer periphery of the above-mentioned shaft and an approximately cup shaped sleeve that is associated loosely to the outer periphery of the above-mentioned shaft. The bottom part of the above-mentioned shaft and bottom face of the above-mentioned sleeve are coupled freely in their rotation, and a rotation suppression means for suppressing the rotation of the above-mentioned sleeve is provided. By the rotation-suppressed sleeve, relative rotation difference with respect to the helical groove is produced. Then, associated with the rotation of the shaft, oil being contacting the inner periphery of the sleeve is dragged due to its viscosity. Thus, the oil is rotated and raised and thereby oil-feeding is accomplished. As a result, an effective viscosity pump can be formed with a small number of parts. Since the bottom part of the shaft and bottom face of the above-mentioned sleeve are coupled freely in their rotation, the relative position of the shaft and the sleeve is restricted, resulting in reducing a chance of occurrence of twisting action between the sleeve and the shaft. [0013] According to the compressor unit of the present invention, the technical effect is obtained such that a compressor having a high mechanical reliability can be offered. [0014] According to a first aspect of the present invention, a compressor can be offered, wherein in a hermetic container containing oil therein, an electric motor including a stator and a rotor contained in the above-mentioned hermetic container, and a compressor unit which is driven by the above-mentioned electric motor, are provided; and the above-mentioned compressor unit comprises shafts expanding in the vertical direction and making the rotating motion and an oil pump which is formed at the lower end of the above-mentioned shaft and connected to the above-mentioned oil; the above-mentioned oil pump includes a helical groove provided helically on the outer periphery of the above-mentioned shaft and a cup-shaped sleeve that is loosely coupled on the outer peripheral end part of the above-mentioned shaft so that it covers the lower end of the above-mentioned helical groove and is coupled in rotation-free manner to the bottom part of the above-mentioned shaft, and the rotation-suppression means for suppressing the rotation of the above-mentioned sleeve. [0015] According to a second aspect of the present invention, a technical effect through which a compressor in accordance with the above-mentioned feature can be offered, wherein the above-mentioned rotation suppression means is the bracket which is held between the above-mentioned stator and the above-mentioned sleeve and fixes the above-mentioned sleeve to the above-mentioned stator. [0016] According to a third aspect of the present invention, a technical effect through which a compressor in accordance with the above-mentioned feature can be offered, wherein the above-mentioned rotation suppression means is a wing part which is formed on the outer periphery of the above-mentioned sleeve and generates the viscous resistance with respect to the oil. [0017] According to a fourth aspect of the present invention, a technical effect through which a compressor in accordance with the above-mentioned feature can be offered, wherein the above-mentioned rotation suppression means is permanent magnets and a member which acts magnetically to them fixed directly or indirectly to both of the above-mentioned sleeve and the above-mentioned hermetic container. [0018] According to a fifth aspect of the present invention, a technical effect through which a compressor in accordance with either one of the above-mentioned features can be offered, wherein the above-mentioned shaft has, on its shaft center, an oil hole expanding in the vertical direction which is connected to the sliding-motion part between the shaft and a member accepting and allowing the sliding-rotation motion of the shaft within it, and the upper end of said helical groove is connected to said oil hole expanding in the vertical direction. [0019] According to a sixth aspect of the present invention, a technical effect through which a compressor in accordance with either one of the above-mentioned features can be offered, wherein the above-mentioned sleeve is formed by integral molding of the synthetic resin. [0020] According to a seventh aspect of the present invention, a technical effect through which a compressor in accordance with either one of the above-mentioned features can be offered, wherein the above-mentioned compressor unit is supported elastically in the above-mentioned hermetic container. [0021] According to an eighth aspect of the present invention, a technical effect through which a compressor in accordance with either one of the above-mentioned features can be offered, wherein the above-mentioned electric motor unit is driven by operation frequencies including frequencies less than the power source frequency. Continue reading about Compressor... Full patent description for Compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this 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 Compressor or other areas of interest. ### Previous Patent Application: Diaphragm pump Next Patent Application: Hydraulic lock for axial motion output device Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Compressor patent info. IP-related news and info Results in 0.33174 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , 174 |
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