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Fluid pumpRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic MotorFluid pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070248475, Fluid pump. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to a fluid pump and more particularly but not exclusively to an AC plunger pump for pumping water in a coffee maker for example. BACKGROUND OF INVENTION [0002] Seals, including seal rings or O-rings, are an integral part of piston and plunger pumps to separate the power fluid from the media that is being pumped or to separate high and low pressure chambers of the pumped media. The seals, the pistons or plungers and the cylinders must have a very tight control of tolerance in dimension. [0003] In a perfect condition, an 0-ring will only be subject to high fluid pressure from the high pressure side on only that (principal) side of the ring, as illustrated in FIG. 6A. The resultant force is one that presses the ring in a direction substantially parallel to the direction of movement of the pumping member, without affecting pumping member's movement. [0004] In an imperfect condition, due to production inaccuracy or wear-and-tear for example, high pressure fluid often gets behind the O-ring, on the outer side thereof, and presses and deforms the ring against the pumping member, as illustrated in FIG. 6B. This will hinder the movement of the pumping member by excessive friction, and reduce the operating life of the ring. [0005] The invention seeks to obviate or at least alleviate such a problem or shortcoming by providing an improved fluid pump. SUMMARY OF THE INVENTION [0006] According to the invention, there is provided a fluid pump comprising a chamber having an inlet and an outlet, and a pumping member extending into the chamber and supported for sliding movement on a suction stroke in one direction outwardly of the chamber to introduce fluid into the chamber via the inlet and on a discharge stroke in the opposite direction inwardly of the chamber to force fluid out of the chamber via the outlet. There is a driver for sliding the pumping member in said opposite directions. A seal ring is provided between the chamber and the pumping member and yet permits said sliding movement of the pumping member relative to the chamber. The seal ring has a first annular portion clamped fast in a wall of one of the chamber and pumping member and a second annular portion of a bulbous cross-section in sliding sealing engagement with a wall of the other of the chamber and pumping member. [0007] Preferably, the bulbous cross-section is relatively thicker than the first annular portion. [0008] It is preferred that the bulbous cross-section is at least part-circular. [0009] Preferably, the first and the second annular portions have cross-sections that are symmetrical about a common central axis. [0010] It is preferred that the first annular portion has a cross-section that is generally flat. [0011] It is preferred that the first annular portion has a cross-section that is generally T-shaped. [0012] It is preferred that the first and the second annular portions have a combined cross-section that is generally dumbbell-shaped. [0013] In a preferred embodiment, the seal ring has an outer annular portion as its first annular portion clamped fast in the wall of the chamber and an inner annular portion as its second annular portion in sliding sealing engagement with the wall of the pumping member. [0014] More preferably, the seal ring is located at an opening of the chamber, through which the pumping member extends into the chamber. [0015] Further more preferably, the opening coincides with the inlet of the chamber. [0016] Preferably, a significant part of the second annular portion of the seal ring is also clamped in the wall of said one of the chamber and pumping member. [0017] It is preferred that the pumping member has a bore that acts as the inlet of the chamber. [0018] Preferably, the pumping member comprises a plunger. [0019] It is preferred that the fluid pump includes one-way valves provided at the inlet and outlet respectively. [0020] Preferably, the driver is an electromechanical driver. [0021] More preferably, the driver is provided by a solenoid comprising an electro-magnetic coil surrounding a ferro-magnetic plunger whose front end acts as the pumping member. BRIEF DESCRIPTION OF DRAWINGS Continue reading about Fluid pump... Full patent description for Fluid pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fluid 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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