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Fluid pumpRelated Patent Categories: Rotary Kinetic Fluid Motors Or Pumps, Working Fluid Passage Or Distributing Means Associated With Runner (e.g., Casing, Etc.), Casing Having Tangential Inlet Or Outlet (i.e., Centrifugal Type), Axially Directed Inlet And Tangential OutletFluid pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060210394, Fluid pump. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is based on and claims priority under 35 U.S.C. .sctn. 119 to Japanese Patent Application 2005-076983, filed on Mar. 17, 2005, the entire content of which is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to a fluid pump including a housing, an intake port, a discharge port, a fluid chamber, a rotation shaft and an impeller. BACKGROUND [0003] A known fluid pump includes a housing, an intake port, a discharge port, a fluid chamber, a rotation shaft and an impeller. Specifically, the fluid chamber is provided inside the housing so as to connect to the intake port and the discharge port, and the impeller is provided inside the fluid chamber and supported by the rotation shaft so as to be rotatable. In this configuration, the fluid pump discharges fluid from the discharge port that is provided outside of the impeller in a radial direction thereof by means of the rotation of the impeller. Such fluid pump is used for an automobile in order to circulate coolant. [0004] More specifically, the fluid pump intakes fluid such as coolant from the intake port, which is provided in an axial direction of the rotation shaft, and the fluid is discharged by means of centrifugal force caused by the rotation of the impeller from the discharge port, which is provided at the outside of the impeller in its radial direction. [0005] A known fluid pump disclosed in JP2000-104548 is comprised of an impeller including a circular cylinder-type fluid chamber, a supported plate and plural blade portions. Specifically, the circular cylinder-type fluid chamber is provided inside a housing, the supported plate is supported by a rotation shaft so as to be rotatable along a back side wall of a fluid chamber, and each of the blade portions is erected on a one surface, which is opposed to the other surface facing to a back side wall of the supported plate, so as to extend in a radial direction of the supported plate. [0006] According to the known fluid pump, the blade portion applies centrifugal force to the fluid by means of the rotation of the impeller, as a result, the supported plate guide the fluid so as to flow in a radial outer direction of the impeller. [0007] In the fluid chamber, a space is formed between a radial outer end of the impeller and an outer peripheral wall portion of the fluid chamber. Specifically, the fluid flows within the space between the radial outer end and the outer peripheral wall in a radial outer direction of the impeller toward the discharge port. [0008] According to the known fluid pump, when a distance between the radial outer end of the impeller and outer peripheral wall portion of the fluid chamber is reduced in order to downsize the fluid pump, because a volume of the space formed between the radial outer end of the impeller and the outer peripheral wall portion of the fluid chamber becomes small, a value of pressure applied to the fluid increases, as a result, the pressure applied to the fluid becomes larger than centrifugal force generated by the blade portion of the impeller. Further, the fluid may flows in an opposite direction of the radially inward direction of the impeller, which causes performance decrement of the fluid pump in terms of total dynamic head and efficiency. [0009] A need thus exists to provide a downsized fluid pump having small performance decrement. SUMMARY OF THE INVENTION [0010] According to an aspect of the present invention, a fluid pump includes a housing, an intake port provided at the housing, a discharge port provided at the housing, a fluid chamber provided inside the housing so as to connect to the intake port and the discharge port, a rotation shaft provided inside the housing, an impeller provided inside the fluid chamber and supported by the rotation shaft so as to be rotatable in order to discharge fluid by means of the rotation of the impeller from the discharge port which is provided radially outside of the impeller, a supported plate provided at the impeller and supported by the rotation shaft so as to be rotatable along a backside wall of the fluid chamber, plural blade portions provided at the impeller so as to be erected on a surface of the supported plate in the opposite side of the backside wall in a manner where it extends in a radial direction of the supported plate, a first inner end formed on each of the blade portions at a radially inner end thereof, plural notch portions formed on the supported plate of the impeller so as to be recessed inwardly from a radially outer end of the supported plate, a second inner end formed on each of the notch portions at a radially inner end thereof, the second inner end being located at least radially outward relative to the first inner end, and the notch portion provided at front of the blade portion in a rotation direction of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS [0011] The foregoing and additional features and characteristics of the present invention will become more apparent from the following detailed description considered with reference to the accompanying drawings, wherein: [0012] FIG. 1 illustrates a cross section indicating a fluid pump; [0013] FIG. 2 illustrates a cross section seen from II-II line. [0014] FIG. 3 illustrates positions of a radial inner end of a notch portion used for a test; [0015] FIG. 4 illustrates a graph indicating results of total dynamic head of the fluid pump obtained by the test; and [0016] FIG. 5 illustrates a graph indicating results of efficiency of the fluid pump obtained by the test. DETAILED DESCRIPTION [0017] An embodiment of a fluid pump according to the present invention will be explained in accordance with the attached drawings. As shown in FIG. 1, the fluid pump includes a housing 1, an intake port 2, a discharge port 3 and a fluid chamber 4. Specifically, the fluid chamber 4 is formed inside the housing 1 so as to connect to the intake port 2, the discharge port 3, a rotation shaft 5 and an impeller 6. Further, the impeller 6 is provided inside the fluid chamber 4 so as to be supported by the rotation shaft 5. In this configuration, fluid sucked from the intake port into the fluid chamber 4 by means of the rotation of the impeller 6 is discharged from the discharge port 3. [0018] The housing 1 includes a first housing 1a and a second housing 1b. The first housing 1a is made of resin material, and the intake port 2 and the discharge port 3 are integrally formed at the first housing 1a. The second housing 1b is also made of a resin material. The first housing 1a and the second housing 1b are screwed together by means of a tightening means 7 such as a bolt so as to form a fluid chamber 4. The fluid chamber 4 includes a small cylindrical space and a large cylindrical space, whose diameter is larger than that of the small cylindrical space, so as to form a stepped portion there between. The rotation shaft 5 is rotatable supported by the housing 1 in a manner where each end portion of the rotation shaft 5 is supported by a bearing portion P. The intake port 2 is formed at the housing 1 so as to extend in an axial direction of the rotation shaft 5, and the discharge port 3 is formed radially outside of the rotation shaft 5, in other words, radially outside of the impeller 6. Continue reading about Fluid pump... Full patent description for Fluid pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fluid pump 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 Fluid pump or other areas of interest. ### Previous Patent Application: Eddy current heating for reducing transient thermal stresses in a rotor of a gas turbine engine Next Patent Application: Nonlinearly stacked low noise turbofan stator Industry Class: Rotary kinetic fluid motors or pumps ### FreshPatents.com Support Thank you for viewing the Fluid pump patent info. IP-related news and info Results in 0.17019 seconds Other interesting Feshpatents.com categories: Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf 174 |
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