| Machine with a rotatable rotor -> Monitor Keywords |
|
|
 
Machine with a rotatable rotorRelated Patent Categories: Pumps, CombinedMachine with a rotatable rotor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070031267, Machine with a rotatable rotor. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to German Application No. 10 2005 038 273.8, filed Aug. 12, 2005, and German Application No. 10 2005 036 307.5, filed Aug. 2, 2005, both of which applications are herein incorporated by reference in their entirety. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to a machine with a rotor that is located so that it can rotate in a housing. The rotor is located at least partly in fluid, such as a coolant. [0004] 2. Technical Considerations [0005] On similar machines of the known art, a housing pressure of at least 1.5 bar is built up in the housing by means of suitable resistances in an outlet line that leads from the housing to a reservoir. On machines of this type where the housing is partly or completely filled with fluid, such as coolant, for example, the rotor rotates partly or completely in the fluid. High heat removal and, thus, high cooling capacity can be achieved and, thus, the machine can be operated at high output. At high speeds of rotation, however, high losses occur, in particular churning losses, on account of the viscous friction of the fluid, which, in turn, results in low efficiency of the machine. [0006] An object of this invention is to provide a machine of the general type described above but that has lower losses and higher cooling capacity than known machines. SUMMARY OF THE INVENTION [0007] The invention teaches that the housing pressure can be reduced such that the fluid transitions into the two-phase range. According to the invention, therefore, the internal pressure in the housing is reduced, for example, to a value of less than approximately 0.8 bar, so that the fluid which is saturated at the ambient temperature transitions to super-saturation and releases gas. This resulting two-phase fluid having a liquid phase and a gas phase, where the area of separation of the phases is in the vicinity of the rotor, has significantly lower viscous friction. As a result of which, reduced losses, in particular churning losses, occur on the rotating rotor and, thus, the machine has a higher level of efficiency. The cooling capacity remains almost unchanged on account of the almost uniform and unchanging quantity of fluid. [0008] In one preferred non-limiting embodiment of the invention, the housing pressure can be reduced by means of a suction device. With a suction device, it is possible to easily generate a vacuum to reduce the pressure inside the housing. [0009] Preference is thereby given to a connection between an outlet line that is in communication with the housing and a suction side of the suction device. [0010] In one embodiment of the invention, the pressure side of the suction device can be connected with a reservoir. As a result, the suction device can easily be located in the outlet line that runs from the housing to the reservoir and is already present. [0011] In an additional advantageous embodiment of the invention, the pressure side of the suction device is realized in the form of a delivery line. With a suction line of this type, an additional user can therefore be supplied with fluid. If hydraulic fluid is used as the fluid, it thereby becomes possible with the suction device to supply another user with hydraulic fluid, e.g., a feed circuit or a steering device. [0012] In one development of the invention, in the outlet line downstream of the suction line there is a stop valve, such as a check valve, that opens in the delivery direction. It thereby becomes possible for the suction device to produce a vacuum to reduce the housing pressure. [0013] Preferably, a bypass line is provided, which is in communication with the outlet line, and bypasses the suction device, and which can be used to equalize the pressure if the housing is totally evacuated by the suction device. [0014] In one preferred embodiment of the invention, the suction device has a pump. A pump is a simple and easy way to generate a vacuum to reduce the pressure inside the housing. [0015] In one development of the invention, the suction device has a vacuum limiting device. With a vacuum limiting device, an excessive vacuum, which can cause the liquid to foam, can be easily prevented. It thereby becomes possible to guarantee a satisfactory and reliable lubrication of the roller bearings that support the rotor by the fluid. [0016] The vacuum choke is thereby advantageously realized in the form of a control valve, which is associated with the suction side of the pump, and is pushed toward a closed position by a spring and toward an open position by the housing pressure. With a vacuum choke of this type, the vacuum in the housing produced by the pump can be limited easily and reliably by the adjustment of the spring. [0017] In an additional preferred embodiment of the invention, the vacuum limiting device is formed by a pressure compensator that is associated with the pump. [0018] The pressure compensator can be preferably realized in the form of a control valve, which is located in a pump bypass line, and is pushed toward an open position by a spring and toward a closed position by the housing pressure. The vacuum produced by the pump can also be easily and reliably limited by adjusting the spring on a pressure compensator of this type. [0019] The suction device can be in a drive connection with the machine, as a result of which no separate drive device needs to be provided for the drive of the suction device. [0020] It is also possible to provide a separate drive motor for the drive of the suction device, such as an electric motor or a hydraulic motor or an internal combustion motor. As a result of which, the suction device can be driven in a simple manner. [0021] The pump of the suction device can be formed by a separate pump, which is used only for the generation of a vacuum in the housing. Continue reading about Machine with a rotatable rotor... Full patent description for Machine with a rotatable rotor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Machine with a rotatable rotor 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 Machine with a rotatable rotor or other areas of interest. ### Previous Patent Application: Self-closing valve with adjustable activation Next Patent Application: Compact vacuum pump Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Machine with a rotatable rotor patent info. IP-related news and info Results in 0.10223 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , 174 |
 * Protect your Inventions * US Patent Office filing 
PATENT INFO |
|
