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PumpRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Rotary Motor And Rotary Nonexpansible Chamber PumpPump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060083643, Pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] The invention relates in general to a pump and in particular to a pump which can gain efficiency without increasing volume. [0002] There are many types of pumps suitable for use in a wide range of applications, all performing the same basic function of drawing fluid from one point to another, or drawing a fluid from one energy level to another. However, pumps for pumping fluids, such as pumps for circulating cooling water to drawn water from a lower position to a higher position have been widely used. For example, in buildings, pumps can draw water from lower levels to a tank at the roof, after which water falls due to gravity so that users can use water. In another example, when a basement is flooded, a pump is used to remove water. [0003] Another utilization of pumps is used in electronic devices with water-cooling systems. The electronic devices such as computers with some components therein generate heat during long time use, these components can break down when too much heat is stocked. A fan is employed to dissipate heat. The requirements of heat dissipation, however, are not easily achieved. A pump can further be employed for circulating cooling water to dissipate heat from components, increasing efficiency of heat dissipation. A conventional pump is shown in FIG. 1. The pump 1 includes an inlet 11 and an outlet 12. When the pump 1 operates, a water pressure differential is generated, such that water is forced into the pump 1 from the inlet 11, and leaves the pump 1 from the outlet 12. Referring to both FIGS. 2A and 2B, the pump 1 includes a case 10, a base 16 and a rotor 15. The case 10 has inlets 11 and outlet 12. The base 16 is disposed in the case 10. The rotor 15 is rotatably connected to the base 16 via a shaft 17. The shaft 17 may be engaged to an opening 166 of the base 16 and a hole 156 of the rotor 15 is then telescoped onto the shaft 17 or the shaft 17 may be engaged to the hole 156 of the rotor 15 and then telescoped onto the base 16, such that the rotor 15 rotates according to the base 16. Furthermore, a coil 18 is disposed around the shaft 17. The rotor 15 includes an impeller 154 and a magnetic extension portion 152. Otherwise, case 10 further includes a ring gasket 19 disposed between the rotor 15 and the case 10 and telescopes onto the shaft 17. Normally, the ring gasket 19 is wear-resisting ceramic metal to limit the rotor 15 to rotate according to the shaft 17. When a current passes through the coil 18 to generate a magnetic field, the magnetic extension portion 152 rotates during inducts the magnetic field, and the impeller 154 rotates therewith. A water pressure differential is generated between the inlet 11 and the outlet 12, so that water flow is generated due to the pump 1, achieving the object of water being drawn. [0004] However, when the pump 1 mentioned is employed in electronic devices, the volume is limited. To satisfy the requirements, the volume of the magnetic extension of the rotor and the coil is reduced such that the efficiency of the pump is decreased. Furthermore, the application of water-cooling systems with pumps is limited. SUMMARY [0005] The invention provides pumps increasing the torque and speed of rotors and further enhancing efficiency of the pumps while keeping the same volume and same structure arrangements. [0006] Pumps are provided. An exemplary embodiment of a pump includes a case, a base and a rotor. The base is disposed in the case for supporting a coil. The rotor comprises a shaft, an impeller and a magnetic extension portion. The rotor is coupled to the base via the shaft, the magnetic extension portion surrounds the coil, and the magnetic extension portion comprises a yoke disposed therein. The coil is disposed around the base and adjacent to the shaft. [0007] In an exemplary embodiment, the rotor may further comprise a hole, the shaft is mounted into the hole so that the rotor rotates with respect to the base. [0008] In an exemplary embodiment, the shaft may be connected to the rotor and mounted into the base so that the rotor rotates with respect to the base. [0009] In an exemplary embodiment, the pump may further comprise a first magnet and a second magnet. The first magnet is disposed on the rotor, the second magnet is disposed inside the case corresponding to the first magnet, and a magnetic force is generated between the first and second magnets to limit the rotor to rotate in a predetermined position. [0010] In an exemplary embodiment, the magnetic force may be a repulsive force along an axial direction of the shaft. [0011] In an exemplary embodiment, profiles of the first and second magnets may be selected from the group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate. Preferably, the first and second magnets may have the same profile. [0012] In an exemplary embodiment, a profile of the yoke may be selected from the group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate. DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 is a schematic diagram of a conventional pump; [0014] FIG. 2A is a sectional view of a conventional pump; [0015] FIG. 2B is an enlarged view of a rotor in a pump; [0016] FIG. 3A is a sectional view of a pump according to the invention; [0017] FIG. 3B is an enlarged view of a rotor in a pump according to the invention; and [0018] FIG. 4 is a curve distribution diagram of induction magnetic flux density of a rotor of a pump according to the invention and a rotor of a conventional pump. DETAILED DESCRIPTION [0019] An exemplary embodiment of a pump according to the invention is described thereinafter. To explain the efficiency gained according to the invention, the size and the components of the pump 3 of the invention are the same as the conventional pump 1. [0020] Referring to both FIGS. 3A and 3B, the pump 3 of the invention comprises a case 30, a base 36 and a rotor 35, and the arrangements and functions are similar to conventional. However, the rotor 35 of the invention comprises a magnetic extension portion 352 comprising a yoke 357 disposed therein. The yoke 357 is completely surrounded by the magnetic extension portion 352. Preferably, the profile of the yoke 357 is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate. Therefore, when a current passes through a coil 38 to generate a magnetic field, the magnetic extension portion 352 rotates during induction of the magnetic field, the yoke 357 is allowed to concentrate the magnetic force of the magnetic field, and the magnetic force is concentrated and passes through the magnetic extension portion 352. Thereafter, the magnetic extension portion 352 inducts more magnetic field than the conventional. The rotor 35 generates more torque to rotate impeller 354, and water pressure differential is enhanced, such that the pump 3 of the invention gains more efficiency without increasing volume. Furthermore, the pump 3 of the invention is used not only for drawing water but for drawing any kind of liquid. Continue reading about Pump... Full patent description for Pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this 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 Pump or other areas of interest. ### Previous Patent Application: Energy dissipation valves for hydraulic cylinders Next Patent Application: Rotor stability of a rotary pump Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Pump patent info. 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