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Diaphragm pumpRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Collapsible Wall Pump, Diaphragm TypeDiaphragm pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070065310, Diaphragm pump. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of Japanese Patent Application No. 2005-258898 filed Sep. 7, 2005, which is hereby incorporated by reference. BACKGROUND [0002] 1. Field [0003] A diaphragm pump with a slim variable volume chamber is provided. [0004] 2. Related Art [0005] A diaphragm pump, for example, as disclosed in Japanese Unexamined Patent Application Publication No. 2001-193656, is constructed with pump chambers (variable volume chambers). The pump chambers are defined by a diaphragm and a pair of check valves having different flow directions that are provided in a pair of channels connected to the pump chamber (a suction-side check valve that allows a flow toward the pump chamber and a discharge-side check valve that allows a flow from the pump chamber are provided in the two channels). The suction-side check valve opens at a stroke for increasing the volume of the pump chamber by oscillating the diaphragm and the discharge-side check valve opens at a stroke for decreasing the volume of the pump chamber to operate the pump. The diaphragm is made of an elastic (oscillatable) material, for example, a rubber, or a piezoelectric oscillator. [0006] The diaphragm pump enables a variable volume chamber to be slimmer and includes a diaphragm. The diaphragm pump is used as a slim pump, for example, a cooling water circulation pump of a water-cooled notebook computer. [0007] There is a need, however, for a diaphragm pump that is slimmer. SUMMARY [0008] A diaphragm pump is provided that comprises pump chambers that are partitioned by a concave portion formed in a housing and an oscillating diaphragm that obturates the concave portion. A suction port and a discharge port are formed in the housing in a direction along with a plain of the diaphragm and of which inner ends communicate with the pump chamber. A suction-side check valve is provided between the inner end of the suction port and the pump chamber. A discharge-side check valve is provided between the inner end of the discharge port and the pump chamber. With respect to a plane, which is perpendicular to the diaphragm and contains an axis line of the suction port and a plane that is perpendicular to the diaphragm and contains an axis line of the discharge port, the suction-side and discharge-side check valves are slanted so that they are more distant from the diaphragm in the inner end side of the suction and discharge ports and are closer to the diaphragm in the outer end side of the suction and discharge ports. [0009] The axis lines of the suction and discharge ports can be formed in parallel with an extending plane of the diaphragm. It is preferable that the axis lines of the suction and discharge ports are not in parallel with the extending plane of the diaphragm and is slanted with respect to the extending plane of the diaphragm so that an angle between the extending plane of the diaphragm and a plane where the suction-side and discharge-side check valves provided is less that an angle between the axis lines of the suction and discharge ports and the extending plane of the diaphragm. [0010] It is desirable that the suction-side check valve and the discharge-side check valve are formed as suction-side and discharge side check valve units that are separate from the housing. The suction-side and discharge-side check valve units are attached to pump chamber side opening ends of the suction and discharge ports. It is also possible that the suction-side and discharge-side check valve units are provided on the same substrate. [0011] It is desirable that the check valve has an umbrella shape. In addition, it is practical that the diaphragm is constructed with a piezoelectric oscillator or an electrostriction oscillator. Specifically, it is desirable that the diaphragm is a bimorph type piezoelectric oscillator. [0012] In the preferred embodiments, the diaphragm pump can be slimed down by improving location relation between the suction and discharge ports and the suction-side and discharge-side check valves that are formed in the pump chamber-side inner ends of the suction and discharge ports that are gateways. BRIEF DESCRIPTION OF THE DRAWING [0013] FIG. 1 is an exploded perspective view of an exemplary diaphragm pump according to a preferred embodiment. [0014] FIG. 2 is an exploded cross sectional view of the exemplary diaphragm pump shown FIG. 1. [0015] FIG. 3 is a top plan view of an exemplary lower housing. [0016] FIG. 4 is a cross sectional view taken along the line IV-IV of FIG. 3. [0017] FIG. 5 is a cross sectional view taken along the line V-V of FIG. 3. [0018] FIG. 6 is a top plan view of an exemplary pump chamber plate side of an upper housing. [0019] FIG. 7 is a top plan view of an exemplary pump chamber that comprises a concave portion of a pump chamber plate. [0020] FIG. 8 is an exploded perspective view of an exemplary bimorph type piezoelectric oscillator. [0021] FIG. 9 is a perspective view that illustrates a relation between the exemplary bimorph type piezoelectric oscillator and a deformed D shape seal ring. Continue reading about Diaphragm pump... Full patent description for Diaphragm pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Diaphragm 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. 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