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PumpPump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080112824, Pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]1. Technical Field [0002]The present invention relates to pumps, and more particularly to a pump having improved hydraulic pressure resistance by increasing the durability of the exterior and interior of the pump, having therein a case formed of a resin material. [0003]2. Description of the Related Art [0004]There is a growing demand for a device such as a water heater to become smaller in dimensions, lighter in weight and energy efficient. Such demand is also expected of a pump installed in the aforementioned device or the like. [0005]A pump in general comprises a DC brushless motor having a rotor which is sealed inside a case, a stator affixed outside the case for driving the rotor, and an impeller which is connected to the rotor and is located in a pump chamber therein. [0006]FIG. 8 is a diagram showing a schematic cross sectional view in an axial direction of an example of a conventional pump. As shown in FIG. 8, a pump 100 has arranged therein a rotor 121 in an interspace between an upper case 111 and a lower case 112 which are formed of a resin material. The pump 100 also includes an annular shaped stator 122 along an outer circumferential surface of the rotor 121. A pump having such configuration is commonly referred to as a canned type pump. [0007]The upper case 111 and the lower case 112 sandwich an O-shaped ring (hereinafter, referred to as an O-ring) 115, and seal an inner portion of the pump 100. Also, a pump chamber 116 is provided at an upper portion of the interspace. An intake portion 113 and a discharge portion 117, which are connected to each other in the pump chamber for, respectively, intaking and discharging fluid, protrude outwardly from the upper case 111. The aforementioned configuration is to be formed integrally. [0008]The rotor 121 is supported and allowed to freely rotate in a radial direction by a cylinder shaped sleeve 125 located surrounding a fixed shaft 123 which is affixed at a center of the pump 100 inside the lower case 112. Also, a thrust washer 124 is provided at top and bottom portions of the sleeve 125 so as to support in the axial direction and allow the rotor to freely rotate. [0009]The rotor 121 comprises an impeller base portion 126 which is connected to the sleeve 125, an impeller 127 which is affixed above the impeller base portion 126, and a rotor magnet 128 which is surroundingly affixed to the rotor 121. The rotor magnet 128 is provided within a cup shaped portion 112a in the lower case 112. [0010]The stator 122 comprises an annular shaped resin mold compound 133 including therein a molded resin 132 in which a printed circuit board 131 and an armature 134 which includes therein an annular shaped laminated core 129 and a coil 130 are provided. [0011]The resin mold compound 133 is located on an outer circumferential surface of the rotor magnet 128 of the rotor 121 and is affixed to the lower case 112. The resin mold compound 133 and the rotor 121 configure the DC brushless motor. When an electric current is applied to the stator 122 via the printed circuit board 131 from an external power supply (not shown in the figures), the impeller 127 rotates along with the rotor 121. Due to the rotation of the impeller 127, fluid is taken in through the intake portion 113 to the pump chamber 116. Then, the fluid pressured by the impeller 127 will be discharged from the discharge portion 117. [0012]For the aforementioned pump 100, metallic cases having a superior durability than the resin based upper case 111 and the lower case 112 are used so as to sustain expansion, which is caused by the hydraulic pressure, of the resin based upper case 111 and the lower case 112, and to improve hydraulic pressure resistance of the pump 100. [0013]However, forming a metal plate into a three-dimensional case by methods such as pressing and welding will be a difficult task. Further, the pressing process is a costly process. Furthermore, such pump requires countermeasures against increased weight thereof and corrosion. [0014]Also, according to the pump 100 as shown in FIG. 8, at a contact portion 136 where the lower case 112 and the annular shaped resin mold compound 133 make contact with each other, the resin mold compound 133 will be affected, via the lower case 112, by the pressure which is generated within the pump. When the pressure within the pump is increased, due to thin resin layers at the contact portion 136, the resin mold compound 133 may be damaged (e.g., occurrences of crack). Ultimately, if the pressure continues, the resin mold compound 133 may be detached from the lower case 112. [0015]Also, in the pump 100, a gap S may be generated between an inner circumferential surface of the resin mold compound 133 affixed to the lower case 112 and an outer circumferential surface of the lower case 112. Each time the case 112 is affected by the pressure from the pump, the gap S may be repeatedly widened. Then, a weld line having a weak connection is likely to be cracked and, thus, water leakage of the pump 100 may occur. BRIEF SUMMARY OF THE INVENTION [0016]The present invention relates to a pump having a structure in which a metallic cover is attached to a case, which is formed of a resin material, so as to increase the durability of the pump having therein the case. Also, the present invention relates to the pump having a structure in which a reinforcement board is provided to the case so as to increase the durability of the case inside the pump. The present invention improves, without any significant increase in weight and a production cost thereof, hydraulic pressure resistance of the pump thereby increasing the durability of the pump. [0017]Further, since the metallic cover is attached to a resin mold compound having molded therein an armature, the durability of the resin mold compound will be increased. [0018]Furthermore, the metallic cover can be embedded in either the case or the resin mold compound. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS [0019]FIG. 1 is a diagram showing a schematic cross sectional view, in an axial direction, of a pump according to a first embodiment of the present invention. [0020]FIG. 2 is a diagram showing a plan view of the pump shown in FIG. 1 as seen from a side of a fluid intake portion. [0021]FIG. 3 is a diagram showing a plan view, as seen from a side of, a pump according to a second embodiment of the present invention. 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: Arrangement having a turbomachine, a cooler and a carrying frame Next Patent Application: Top plunger adapter Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Pump patent info. IP-related news and info Results in 0.69526 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , 174 |
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