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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 20070065309, Diaphragm pump. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of Japanese Patent App. No. 2005-257376 filed Sep. 6, 2005, which is hereby incorporated by reference. BACKGROUND [0002] 1. Field A diaphragm pump is provided. [0003] 2. Related Art [0004] Generally, a diaphragm pump is constructed with pump chambers (variable volume chamber) that 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 allowing a flow toward the pump chamber and a discharge-side check valve allowing a flow from the pump chamber are provided in the two channels). To operate the pump, 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. The diaphragm is made of an elastic (oscillatable) material, for example, a rubber, or a piezoelectric oscillator. [0005] An example of the conventional diaphragm pump is disclosed in Japanese Unexamined Patent Application Publication No. 2001-193656. As described above, the operation of a diaphragm pump is accompanied by pulsation at the discharge port caused by repeating the opening of the suction-side check valve at a stroke that increases the volume of the pump chamber and the opening of the discharge-side check valve at a stroke that decreases the volume of the pump chamber. [0006] A diaphragm pump with a pulsation period at the discharge port is reduced to a half of the pulsation period at the discharge port of the conventional diaphragm pump is disclosed in Japanese Unexamined Patent Application Publication No. 2005-337068. In the diaphragm pump, pump chambers are formed above and under the diaphragm. A single suction port and a single discharge port are installed. First and second suction-side check valves allow fluid to flow from a suction port toward the pair of pump chambers and do not allow fluid to flow in the reverse directions are provided between the pair of pump chambers and the suction port. First and second discharge-side check valves allow fluid to flow from the pair of pump chambers toward the discharge port and does not allow fluid to flow in the reverse directions are provided between the pair of pump chambers and the discharge port (four-valve diaphragm pump). [0007] In addition, a pump structure that enables a slim sized four-valve diaphragm pump is disclosed in Japanese Unexamined Patent Application Publication No. 2005-337068. Umbrellas are attached in the suction and discharge ports formed in the upper and lower housings, respectively, and separate covers are adhered thereto for forming channels. For example, the covers may be adhered by using a highly reliable laser welding. However, over the lifetime of the pump a leak may be caused in a pump by deterioration. It is difficult to obtain perfect reliability. SUMMARY [0008] In a preferred embodiment, a diaphragm pump includes a pair of pump chambers that are formed by an oscillatable diaphragm above and under the diaphragm. First and second suction-side check valves allow fluid to flow from a suction port toward the pair of pump chambers and do not allow fluid to flow in the reverse directions are provided between the pair of pump chambers and the suction port. First and second discharge-side check valves that allow fluid to flow from the pair of pump chambers toward a discharge port and do not allow fluid to flow in the reverse directions are provided between the pair of pump chambers and the discharge port. The diaphragm pump comprises an upper housing, a pump chamber plate, a diaphragm, and a lower housing, in a sequentially stacked form. The lower housing comprises a first pump chamber that including a concave portion that forms one pump chamber and faces the diaphragm. The suction port includes the first suction-side check valve communicating with the pump chamber forming the concave portion. The discharge port includes the first discharge-side check valve that communicates with the pump chamber concave portion. The pump chamber plate includes a second pump chamber concave portion that forms the other pump chamber and faces the diaphragm, the second suction-side check valve, and the second discharge-side check valve are provided. An interplate suction-side channel that is bifurcated from the second suction-side check valve and connected to the second suction-side check valve and an interplate discharge-side channel that is bifurcated from the second discharge-side check valve and connected to the second discharge-side check valve are provided between the upper housing and the pump chamber plate. [0009] It is desirable that the interplate suction-side channel and the interplate discharge-side channel are sealed by a seal ring inserted between the pump chamber plate and the upper housing. [0010] It is desirable that one end of the interplate suction-side channel and the interplate discharge-side channel communicate with the second suction-side check valve and the second discharge-side check valve, and the other end of the interplate suction-side channel and the discharge-side channel communicate with the channels bifurcated from the suction and discharge ports that open to the lower housing. [0011] When the seal ring has an oval shape, it is easy to form the channel. [0012] It is desirable the first suction-side check valve and the first discharge-side check valve that are provided in the lower housing are formed as a first suction-side check valve unit and a first discharge-side check valve unit that are separate from the lower housing. The first suction-side check valve unit and the first discharge-side check valve unit are attached to pump chamber-side opening ends of the suction and discharge ports. In an alternate embodiment, the first suction-side check valve unit and the first discharge-side check valve unit are provided on the same substrate. [0013] When the suction and discharge ports of the lower housing protrude in parallel with each other in the plane direction of the diaphragm in a free state, it is desirable to obtain a slim diaphragm pump. [0014] According to any embodiments of the present invention, it is desirable that the check valve has an umbrella shape. In addition, it is preferred that the diaphragm is a piezoelectric oscillator or an electrostriction oscillator. Specifically, it is desirable that the diaphragm is a bimorph type piezoelectric oscillator. BRIEF DESCRIPTION OF THE DRAWING [0015] FIG. 1 is an exploded perspective view of an exemplary diaphragm pump according to a preferred embodiment. [0016] FIG. 2 is an exploded cross sectional view of the diaphragm pump shown FIG. 1. [0017] FIG. 3 is a top plan view of an exemplary lower housing. [0018] FIG. 4 is a cross sectional view taken along the line IV-IV of FIG. 3. [0019] FIG. 5 is a cross sectional view taken along the line V-V of FIG. 3. [0020] FIG. 6 is a top plan view of an exemplary pump chamber plate side of an upper housing. [0021] FIG. 7 is a top plan view of an exemplary pump chamber that forms a concave portion of a pump chamber plate. 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. 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