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Submersible pumpSubmersible pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070201994, Submersible pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]1. Field of the Invention [0002]The present invention relates to a submersible pump. [0003]2. Description of Related Art [0004]A submersible pump in which water flows along the entire circumference thereof has been known as a temporary submersible pump used for drainage in a construction site (for example, see Japanese Patent No. 3239179). [0005]The submersible pump of this kind includes a motor, a motor casing and a substantially cylindrical external casing. The motor has a drive shaft extending in the vertical direction and the motor casing contains the motor therein. The external casing forms an annular channel in association with the outer circumferential surface of the motor casing between them and a discharge port is formed in the external casing to communicate with the annular channel. The submersible pump is configured such that fluid is drained out through the annular channel and the discharge port as a pump assembly is driven by the motor. [0006]When the motor of the submersible pump is a single phase motor, a capacitor is required to operate it. In the conventional submersible pump according to the above publication, the capacitor is arranged above the motor. [0007]Submersible pumps for temporary use as described above are generally equipped with a handle for easy portability. Therefore, they are required to be small in size. However, the above-described submersible pump, which includes the capacitor arranged above the motor, becomes large in height. SUMMARY OF THE INVENTION [0008]The present invention has been achieved in this respect. That is, an object of the invention is to reduce the size of the submersible pump to a further extent. [0009]According to an aspect of the present invention, a submersible pump includes: a single phase motor having a drive shaft extending in the vertical direction; a pump assembly which is driven by the single phase motor; a motor casing in which the single phase motor is contained; an external casing in which the motor casing is inserted to form an annular channel between the external casing and the outer circumferential surface of the motor casing; and a capacitor which is arranged on the side of the single phase motor in the motor casing. [0010]With this configuration, the capacitor, which has been arranged above the single phase motor in the conventional pump, is provided on the side of the single phase motor. This eliminates the need of ensuring space for installing the capacitor above the single phase motor, thereby reducing the height of the submersible pump. [0011]Further, as an annular channel is formed around the single phase motor (motor casing), the capacitor arranged on the side of the single phase motor is located within the annular channel. Therefore, there is no need of increasing the size of the external casing. That is to say, the outside diameter of the submersible pump is not increased even if the capacitor is arranged on the side of the single phase motor. Thus, the submersible pump is reduced in size. [0012]The single phase motor may be arranged such that the drive shaft thereof is eccentric to the center of the external casing in a certain direction of eccentricity and the capacitor may be arranged on the side of the single phase motor opposite the certain direction of eccentricity. [0013]If the single phase motor is arranged eccentrically with respect to the external casing, the annular channel, which is formed between the motor casing and the external casing, becomes relatively large in a portion thereof opposite the direction of eccentricity of the single phase motor. [0014]As the relatively large portion of the annular channel is reserved for the capacitor, it becomes possible to arrange a capacitor with increased capacitance and size therein. [0015]The submersible pump may further include a motor cover which closes an upper opening end of the motor casing. Further, the motor cover may be attached with a bearing for supporting the drive shaft of the single phase motor. [0016]As described above, since the capacitor is arranged on the side of the single phase motor, there is no need of ensuring space for installing the capacitor above the single phase motor. This makes it possible to attach the bearing for supporting the drive shaft directly to the motor cover which closes the upper opening end of the motor casing. Therefore, a bracket for the bearing is no longer necessary, thereby reducing the number of components. BRIEF DESCRIPTION OF THE DRAWINGS [0017]FIG. 1 is a sectional view of a submersible pump according to an embodiment of the present invention taken along the line I-I of FIG. 3. [0018]FIG. 2 is a sectional view taken along the line II-II of FIG. 3. [0019]FIG. 3 is a plan view of the submersible pump. [0020]FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION Continue reading about Submersible pump... Full patent description for Submersible pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Submersible 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 Submersible pump or other areas of interest. ### Previous Patent Application: Bearing protection for inverter-driven motor Next Patent Application: Motor-compressor unit mounting arrangement for compressors Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Submersible pump patent info. 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