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Metered pulse pumpRelated Patent Categories: Pumps, Three Or More Cylinders Arranged In Parallel, Radial, Or Conical Relationship With Rotary Transmission AxisMetered pulse pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060239834, Metered pulse pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] Rapidly reciprocating piston pumps are used to pump high-pressure fluid for a variety of purposes. It is also sometimes necessary to insert a chemical additive into the high-pressure fluid stream. However, when such additives are corrosive, they should not be pumped by the primary pump. Instead, a secondary, metering pump is used to pump the additive liquid. [0002] Various devices have been employed for automatically metering small amounts of an additive liquid to the mainstream of a liquid carrier. When the liquid carrier is under high pressure, however, highly sophisticated and hence expensive metering pumps such as gear pumps ordinarily are employed. An inexpensive apparatus which would permit an additive liquid to be metered to a liquid carrier under high pressure is much to be desired. [0003] A Metering Pulse Pump is disclosed in U.S. Pat. No. 3,930,756. However, this pulse pump uses a diaphragm pump to pump the additive liquid to the mainstream of the liquid carrier. Such diaphragm pumps are prone to early failure. It also requires a pressure-relief valve to regulate the pressure of the metering pulse pump and the speed of the pump and length of its stroke. [0004] There is a need for an improved metering pulse pump that overcomes the above problems. SUMMARY OF THE INVENTION [0005] A metering pulse pump for metering an additive liquid into a liquid carrier under high pressure, the pump comprising: [0006] a rapidly reciprocating piston pump having a plurality of pumping chambers and having an inlet connectable to a source of liquid and an outlet, and an outlet line carrying liquid from the outlet under high pressure; [0007] a source of additive liquid; [0008] a differential piston pump having an inlet connectable to the source of additive liquid, an inlet check valve, a pumping chamber, an outlet check valve, and an outlet connected to the outlet line; and [0009] a connection from one of the plurality of reciprocating pump pumping chambers to the differential piston pump feeding high-pressure liquid to start the pumping stroke of the differential piston pump. [0010] A principal object and advantage of the present invention is that the differential piston pump has a longer life than a diaphragm pump used previously. [0011] Another principal object and advantage of the present invention is that it is simpler than earlier metering pulse pumps. BRIEF DESCRIPTION OF DRAWINGS [0012] FIG. 1 is a perspective view of a first embodiment of the metering pulse pump of the present invention. [0013] FIG. 2 is a cross-section taken at approximately the lines 2 of FIG. 1, during the pumping stroke. [0014] FIG. 3 is similar to FIG. 2, taken during the return stroke. [0015] FIG. 4 is a perspective view of a second embodiment of the metering pulse pump of the present invention. [0016] FIG. 5 is a cross-section taken at approximately the lines 5 of FIG. 4, during the pumping stroke. [0017] FIG. 6 is similar to FIG. 5, taken during the return stroke. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0018] The metering pulse pump of the present invention is generally shown in the Figures as reference numeral 10. [0019] The metering pulse pump 10 is used for metering an additive liquid (such as a chemical) into a liquid carrier which is under high pressure. [0020] The metering pulse pump 10 comprises a rapidly reciprocating piston pump 20 having a plurality of pumping chambers 22a, 22b, 22c etc. and also having an inlet 24, a source 26 of additive liquid and an outlet 28, and also comprising an outlet line 29 carrying liquid from the outlet 28 under high pressure. A pump 20 which may be used in the present invention is disclosed in U.S. Pat. No. 3,930,756, herein incorporated by reference. However, this earlier pump suffers from the disadvantage of being prone to earlier failure because of its use of a diaphragm pump and also of being complex because of the need for a pressure relief valve to regulate the pressure in the pumping chamber. [0021] The present invention comprises the following changes to the previously described rapidly reciprocating piston pump 20. [0022] A differential piston pump 30 has an inlet 32 connectable to the source 26 of additive liquid. The differential piston pump 30 further comprises a pumping chamber 42. An inlet check valve 40 is inserted between the inlet 32 and the pumping chamber 42. The differential piston pump 30 further comprises an outlet check valve 44, and an outlet 46 connected to the outlet line 29 of the rapidly reciprocating piston pump 20. [0023] A connection 50 is made from one of the plurality of pumping chambers 22a, 22b, 22c, etc. to the differential piston pump so that high-pressure liquid from the rapidly reciprocating piston pump 10 can be used to start the pumping stroke of the differential piston pump 30 as will be further described. [0024] In further detail, the differential piston pump 30 further comprises a differential piston 34, having a first portion 34a and a second portion 34b, the first portion 34a having a larger surface area than the second portion 34b. The differential piston 34 reciprocates in the pumping chamber 42. Continue reading about Metered pulse pump... Full patent description for Metered pulse pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Metered pulse 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 Metered pulse pump or other areas of interest. ### Previous Patent Application: Compressed air power generating systems using a rotary gravity compressor Next Patent Application: Motor driven compressor Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Metered pulse pump patent info. 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