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Metered pulse pump

Inactive Publication Date: 2006-10-26
DIVERSIFIED DYNAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[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.

Problems solved by technology

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.
When the liquid carrier is under high pressure, however, highly sophisticated and hence expensive metering pumps such as gear pumps ordinarily are employed.
Such diaphragm pumps are prone to early failure.

Method used

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Examples

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first embodiment

[0025] the present invention is shown in FIGS. 1-3.

[0026] In the first embodiment, the differential piston pump 30 further comprises a spring 36 biasing the differential piston 34 toward its return stroke. In this embodiment, the pumping chamber 42 may enclose the spring 36, as shown.

[0027] Operation of the first embodiment is as follows.

[0028] As shown in FIG. 2, during the pumping stroke of one of the plurality of pumping chambers 22a, 22b, 22c etc. of the rapidly reciprocating piston pump, high-pressure fluid is forced against the first portion 34a of the differential piston pump 34. At this same moment, the pumping chamber 42 of the differential piston pump 34 is encountering high-pressure from the fluid in the outlet line of the rapidly reciprocating piston pump. These pressures may be approximately equal. However, high-pressure fluid in the pumping chamber 42 encounters the portion 34b having a smaller surface area than the portion 34a.

[0029] The operating principle of a di...

second embodiment

[0032] In the second embodiment, shown in FIGS. 4-6, rather than having a spring 36 biasing the differential piston 34 toward its return stroke, the differential piston pump 30 further comprises a connection 60 from another of the plurality of reciprocating pump pumping chambers 22a, 22b, 22c., etc. to the differential piston pump 30. It will be clear from a study of U.S. Pat. No. 3,930,756 that the pumping chambers 22a, 22b, 22c., etc. are out of phase from each other. That is, for example, as chamber 22a is pumping high-pressure primary liquid, another chamber 22c will be on its intake stroke. Conversely, as chamber 22a is on its intake stroke, chamber 22c is pumping high-pressure primary liquid.

[0033] In the second embodiment, high-pressure liquid from chamber 22a, for example, is fed through the connection 50 to the differential piston pump 34, and high-pressure liquid from chamber 22c, for example, is fed through connection 60 to the differential piston pump 34. As shown in FIG...

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Abstract

A metering pulse pump for metering an additive liquid into a liquid carrier under high pressure includes a rapidly reciprocating piston pump having a number 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; a source of additive liquid; 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 a connection from one of the reciprocating pump pumping chambers to the differential piston pump feeding high-pressure liquid to start the pumping stroke of the differential piston pump. In one embodiment, a spring is used to return the differential piston on its intake stroke. In a second embodiment, a connection from another of the reciprocating pump pumping chambers, which is out of phase with the first chamber, is used to return the differential piston on its intake stroke.

Description

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 mainstre...

Claims

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Application Information

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IPC IPC(8): F04B27/08
CPCF04B9/10F04B23/06F04B13/02
Inventor LARSON, STEVE A.
Owner DIVERSIFIED DYNAMICS