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  Centrifugal pumpUSPTO Application #: 20060280631Title: Centrifugal pump Abstract: A housing of a centrifugal pump includes a fluid inlet, a fluid outlet, and an accommodation chamber. An impeller of the pump is disposed in the accommodation chamber and includes at least one venthole axially penetrating the impeller. A drive member is fixed to one side of the housing and corresponds to the impeller for providing electromagnetic force required for rotation of the impeller. A central shaft penetrates the center of the impeller and axially extends to the drive member. (end of abstract) Agent: Birch Stewart Kolasch & Birch - Falls Church, VA, US Inventors: Shui-Fa Tsai, Hou-Chu Chen, Chin-Chu Hsu, Wen-Shi Huang USPTO Applicaton #: 20060280631 - Class: 417423100 (USPTO) Related Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Rotary Motor And Rotary Nonexpansible Chamber Pump The Patent Description & Claims data below is from USPTO Patent Application 20060280631. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] The invention relates to a centrifugal pump, and in particular to a centrifugal pump with a vent structure enabling removal of air therefrom. [0002] Referring to FIG. 1, a conventional centrifugal pump comprises a housing 1, an impeller 2, a stator 3, and a central shaft 4. The stator 3 is able to activate the impeller 2 rotating with the central shaft 4. [0003] The housing 1 comprises an accommodation chamber in which the impeller 2 is disposed. The housing 1 further comprises a water inlet 10 and a water outlet 12. Water flows into the centrifugal pump via the water inlet 10. In another aspect, water flows out of the centrifugal pump along the rotational direction of the impeller 2 and via the water outlet 12. [0004] The impeller 2 comprises a rotating portion 20 and a plurality of blades 22 disposed thereon. [0005] The stator 3 is disposed under the impeller 2 and coupled to the rotating portion 20, activating the impeller 2 by electromagnetic force when electricity is applied thereto. The central shaft 4 axially penetrates the center of the impeller 2 and extends to the stator 3. [0006] The water inlet 10, water outlet 12, and accommodation chamber of the housing 1 are connected to and communicated with one another. During operation of the conventional centrifugal pump, water flows to the impeller 2 via the water inlet 10 and obtains kinetic energy by rotation of the impeller 2. The water then flows out of the centrifugal pump via the water outlet 12 by centrifugal force provided by the blades 22 of the impeller 2. [0007] Nevertheless, at startup or during operation of the conventional centrifugal pump, air inevitably enters the centrifugal pump, adversely affecting the pumping pressure and causing the impeller 2 to idle. Air binding is thus generated. [0008] Moreover, when the centrifugal pump operates in the presence of air and water, rotational balance of the impeller 2 is adversely affected to cause noise. Furthermore, air erosion is easily generated in the centrifugal pump. Namely, air bubbles in the centrifugal pump break and strike the impeller 2 during rapid movement of the water and the air bubbles, ablating the surfaces of the blades 22 of the impeller 2 and thereby causing damage thereto. SUMMARY [0009] Accordingly, an embodiment of the invention provides a centrifugal pump comprising a housing, an impeller, a stator, and a central shaft. The housing comprises a fluid inlet, a fluid outlet, and an accommodation chamber. The fluid inlet, fluid outlet, and accommodation chamber are connected to and communicated with one another. The impeller is disposed in the accommodation chamber and comprises at least one venthole axially penetrating the impeller. The stator is fixed to one side of the housing and corresponds to the impeller, providing electromagnetic force required for rotation of the impeller. The central shaft penetrates the center of the impeller and axially extends to the stator. [0010] The impeller further comprises a rotating portion and a plurality of blades. The venthole axially penetrates the rotating portion, and the blades are formed on a surface of the rotating portion. [0011] The housing further comprises a top cover and an outer frame. The accommodation chamber is between the top cover and the outer frame. The fluid inlet and fluid outlet are formed and extend in the top cover. Fluid flows into the centrifugal pump via the fluid inlet and out of the centrifugal pump via the fluid outlet along the rotational direction of the impeller. [0012] The outer frame surrounds the stator, preventing the fluid from entering the drive member. [0013] The housing further comprises a base opposite to the top cover, and the stator is fixed to the base. [0014] Accordingly, when the centrifugal pump operates, air therein is expelled via the venthole, thereby decreasing pumping pressure loss, air binding, noise, vibration, and air erosion. [0015] Another embodiment of the invention provides a centrifugal pump comprising a housing, an impeller, a stator, and a central shaft. The housing comprises a fluid inlet, a fluid outlet, and an accommodation chamber. The impeller is disposed in the accommodation chamber. The stator is fixed to one side of the housing and corresponds to the impeller, providing electromagnetic force required for rotation of the impeller. The central shaft penetrates the center of the impeller and axially extends to the stator. The central shaft comprises a spiral groove on the surface thereof. The spiral direction of the spiral groove corresponds to the rotational direction of the impeller. [0016] Accordingly, when the centrifugal pump operates, air therein moves to the central shaft by compression of fluid and is expelled along the spiral groove, thereby decreasing pumping pressure, air binding, noise, vibration, and air erosion. DESCRIPTION OF THE DRAWINGS [0017] The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: [0018] FIG. 1 is a schematic cross section of a conventional centrifugal pump; [0019] FIG. 2 is a schematic cross section of the centrifugal pump of a first embodiment of the invention; [0020] FIG. 3 is a schematic top view of the impeller of FIG. 2; and [0021] FIG. 4 is a schematic cross section of the centrifugal pump of a second embodiment of the invention. Continue reading... Full patent description for Centrifugal pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Centrifugal 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 Centrifugal pump or other areas of interest. ### Previous Patent Application: Linear compressor Next Patent Application: Fan motor assembly Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Centrifugal pump patent info. IP-related news and info Results in 4.88874 seconds Other interesting Feshpatents.com categories: Accenture , Agouron Pharmaceuticals , Amgen , AT&T , Bausch & Lomb , Callaway Golf |
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