US3749522A - Prevention of infiltration of gas bubbles into slurry pump parts - Google Patents

Prevention of infiltration of gas bubbles into slurry pump parts Download PDF

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Publication number
US3749522A
US3749522A US00134945A US3749522DA US3749522A US 3749522 A US3749522 A US 3749522A US 00134945 A US00134945 A US 00134945A US 3749522D A US3749522D A US 3749522DA US 3749522 A US3749522 A US 3749522A
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United States
Prior art keywords
liquid
slurry
seal
diaphragm
interface
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Expired - Lifetime
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US00134945A
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English (en)
Inventor
T Kazama
K Sek
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Mitsubishi Shindoh Co Ltd
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Mitsubishi Shindoh Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/141—Intermediate liquid piston between the driving piston and the pumped liquid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/90—Slurry pumps, e.g. concrete

Definitions

  • This invention relates generally to slurry pumps of the liquid-diaphragm type and more particularly to a new method and apparatus for preventing gas bubbles in a slurry being pumped from infiltrating into the diaphragm and piston parts of a slurry pump.
  • Slurry pumps with which this invention is concerned are of the class described in Japanese Pat. publication No. 12131/1960, U.S. Pat. No. 3,241,496, patented Mar. 22, 1966, British Pat. No. 1,187,912, patented Aug. 12, 1970, and South African Pat. No. 68/0753, patented May 30, 1969.
  • slurries there are those, such as caustic bauxite slurries and limestone slurries containing viscosity-reducing agents, which contain a large number of gas (air) bubbles.
  • caustic bauxite slurries and limestone slurries containing viscosity-reducing agents, which contain a large number of gas (air) bubbles.
  • the bubbles carry solid particles into the diaphragm liquid (oil), whereby the liquid becomes contaminated, and the particles tend to cause wear of the piston parts.
  • the gas (air) causes a reduction in the pump delivery, while clogging due to settling of the particles easily occurs.
  • an object of this invention is to fulfil the above stated requirement in slurry pumps of the liquiddiaphragm type. More specifically, an object of the invention is to provide a method and apparatus for preventing gas bubbles in a liquid containing a large quantity of bubbles and being pumped by a liquiddiaphragm slurry pump from infiltrating into the diaphragm chamber.
  • a method and apparatus for preventing infiltration of gas bubbles as described above wherein a seal liquid without gas bubbles is injected into the slurry in the liquid-diaphragm chamber thereby to create a liquid flow counter to the direction of the infiltration of gas bubbles into the diaphragm chamber.
  • FIGURE is a diagrammatic side elevation, in vertical section, showing the essential parts of a slurry pump of liquid-diaphragm type and indicating an example of practice of the invention.
  • the principal components of the slurry pump illustrated in the drawing are a plunger pump 1, a valve box 4, and an oil-diaphragm chamber 11 connected be tween the plunger pump and the valve box.
  • the plunger pump 1 has a cylinder 3 filled with oil and connected by way of an oil connecting pipe 12 to the upper part of the chamber 11 and a plunger 2 driven by means not shown and operating as a piston within the cylinder 3.
  • the valve box 4 has a slurry suction pipe 9 and a slurry discharge pipe 10 and is provided internally with spacedapart valve seats 5 and 6 for cooperatively operating with ball valves 7 and 8, respectively, acting on the downstream sides of their valve seats to function as check valves for preventing reversal of slurry flow.
  • a middle chamber 4a is formed between the two ball valves and communicates by way of a slurry connecting pipe 13 to the bottom of the oildiaphragm chamber 11.
  • the chamber 11 is provided thereabove with an oil reservoir tank 14 communicating through a shut-off valve 15 to the upper part of the chamber 11.
  • the upper part of this oil-diaphragm chamber 11 contains oil 22 communicating integrally with the oil in the pipe 12 and cylinder 3, while the lower part of the chamber 11 contains slurry 20 communicating integrally with the slurry in the pipe 13 and chamber 4a, an interface 21 being formed naturally between the oil 22 and slurry 20 because of the difference in the specific gravities thereof.
  • liquid-diaphragm slurry pump of the above described organization is known, and the organization and operation thereof are disclosed in greater detail in the aforementioned references.
  • a method and apparatus for preventing infiltration of gas bubbles into the oil-diaphragm chamber 1 comprises a reservoir tank 18 for storing the mother liquor of the slurry not containing any bubbles and constituting a seal liquid, a liquid injection pipe 19 disposed in the lower part of the oil-diaphragm chamber 11, a booster'pump l7, driven by motive power means (not shown), for pumping the seal liquid from the tank 18 into the injection pipe 19, a check valve 16 disposed between the pump 17 and the injection pipe 19 for preventing reversal flow of the seal liquid, and necessary piping and pipeline accessories (not shown).
  • This apparatus is operated, during the pumping operation of the slurry pump, to inject at a low flowrate the seal liquid without bubbles into-the slurry 20 in the lower part of the oil-diaphragm chamber 11 thereby to force back gas bubbles traveling through the slurry pipe 13 and tending to enter into the chamber 11.
  • the bubbles are, thus inhibited from traveling toward the chamber 11 and caused to be discharged through the slurry discharge pipe 10.
  • the check valve 16 permits the seal liquid to flow freely into the chamber 1 1.
  • the check valve 16 operates to prevent reverse flow or return of the injected liquid or entrance of slurry into the injection pipe 19, whereby the slurry is sent in the normal manner toward the slurry pipe 13. Since the seal liquid is thus injected a little at a time into the chamber 11 during the suction stroke of the plunger pump 1, a net flow of liquid is created through the slurry pipe 13 from the oil-diaphragm chamber 11 toward the valve box 4, whereby the quantity of gas bubbles tending to enter the chamber 11 becomes progressively less.
  • the present invention provide a method and apparatus which, when applied to a slurry pump of liquiddiaphragm type, afford a saving in operational labour, eliminate the possibility of excessive wear of the slurry pump parts due to contamination of the diaphragm liquid, and enable the pump to operate stably with a steady delivery without the possibility of settling of particles to cause clogging even when the slurry pump is operated to pump slurry containing a large quantity of gas bubbles.
  • the apparatus according to the invention may include control means 23 to control automatically the flowrate of the seal liquor supplied into the chamber 11 and means 24 to detect the concentration of gas bubbles in the slurry 20 and to generate corresponding signals in response to which the control means can operate to control the flowrate accordingly.
  • a method of preventing gas bubbles entrained in said slurry from infiltrating into said diaphragm liquid comprising injecting a seal liquid without gas bubbles into the slurry in said chamber to create a liquid flow counter to the direction of said infiltration of gas bubbles.
  • an apparatus for preventing gas bubbles entrained in said slurry from in filtrating the diaphragm liquid comprising a reservoir containing a seal liquid without gas bubbles, liquid-injection means for injecting said seal liquid into the slurry in the liquid-diaphragm chamber, means defining a flow path from said reservoir to said liquidinjection means, liquid-transfer means for transferring seal liquid from said reservoir through said flow path to said liquid-injection means, and a check valve disposed between the liquid-transfer means and liquid-injection means for preventing reverse flow in said flow path.
  • Apparatus as claimed in claim 3 in which there are provided detecting means for detecting the concentration of gas bubbles in the slurry in the liquid-diaphragm chamber to generate corresponding signals and control means operating in response to said signals to control the flowrate of the seal liquid through the flow path.
  • a slurry pump having a liquiddiaphragm chamber for containing in operation a slurry and a diaphragm liquid thereabove defining an interface therebetween, an apparatus for preventing gas in a gaseous phase entrained in said slurry from infiltrating into said diaphragm liquid, said apparatus comprising means to apply under pressure a seal liquid free of entrained gases to said slurry in said liquid-diaphragm chamber in a counter flow path directed away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
  • said means for applying said seal liquid comprises a reservoir containing said seal liquid, liquid-injection means for injecting said seal liquid into said slurry in said liquid-diaphragm chamber, liquid-transfer means to supply said seal liquid from said reservoir to said liquidinjection means.
  • Apparatus as claimed in claim 7, including sensing means detecting the concentration of said gas entrained in said slurry, control means responsive to said sensing means to control the flow rate of said seal liquid to said liquid-injection means.
  • an apparatus for preventing gas in a gaseous phase entrained in said slurry from infiltrating into said diaphragm liquid comprising means to apply under pressure a seal liquid free of entrained gases to said slurry in said liquiddiaphragm chamber in a counter flow path directed away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
  • said means for applying said seal liquid comprises a reservoir containing said seal liquid, liquid-injection means for injecting said seal liquid into said slurry in said liquid-diaphragm chamber, and liquid-transfer means to supply said seal liquid from said reservoir to said liquid-injection means.
  • a method of preventing infiltration of gas bubbles into a liquid defining an interface with a mixture of a liquid with insoluble matter comprising, applying a seal liquid free of bubbles under pressure to said mixture in the vicinity of said interface as a counter flow directed to flow away from said interface and in an area effective to substantially prevent infiltration of said gas into said interface.
  • seal liquid comprises the component liquid of said liquid mixture.
  • a method of preventing gas bubbles entrained in said slurry from infiltrating into said diaphragm liquid comprising, applying under pressure a seal liquid free of bubbles to said slurry in said liquiddiaphragm chamber in the vicinity of said interface and directed to flow away from said interface and in an area effective to substantially prevent infiltration of said gas bubbles into said interface.
  • seal liquid comprises the component liquid of said slurry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Details Of Reciprocating Pumps (AREA)
US00134945A 1970-09-21 1971-04-19 Prevention of infiltration of gas bubbles into slurry pump parts Expired - Lifetime US3749522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45082838A JPS4936162B1 (enrdf_load_stackoverflow) 1970-09-21 1970-09-21

Publications (1)

Publication Number Publication Date
US3749522A true US3749522A (en) 1973-07-31

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ID=13785529

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Application Number Title Priority Date Filing Date
US00134945A Expired - Lifetime US3749522A (en) 1970-09-21 1971-04-19 Prevention of infiltration of gas bubbles into slurry pump parts

Country Status (4)

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US (1) US3749522A (enrdf_load_stackoverflow)
JP (1) JPS4936162B1 (enrdf_load_stackoverflow)
GB (1) GB1326342A (enrdf_load_stackoverflow)
ZA (1) ZA712460B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097201A (en) * 1976-01-02 1978-06-27 Nussbaum Gerald F Combined well pump housing and aeration means
US4310491A (en) * 1980-03-05 1982-01-12 Hitachi, Ltd. Apparatus for supplying raw liquid and relieving pressure of high-pressure product liquid
US4378183A (en) * 1980-09-18 1983-03-29 The Pittsburgh & Midway Coal Mining Co. Apparatus and method for pumping hot, erosive slurry of coal solids in coal derived, water immiscible liquid
US4613290A (en) * 1984-04-23 1986-09-23 Lefco Western, Inc. Evacuated pumping system
US4662386A (en) * 1986-04-03 1987-05-05 Sofec, Inc. Subsea petroleum products storage system
US4948349A (en) * 1987-09-22 1990-08-14 Yoshinobu Koiwa Pump and valve apparatus
DE3909800A1 (de) * 1989-03-24 1990-09-27 Neuhaeuser Gmbh & Co Membranpumpe zum pneumatischen foerdern von fluidisierten schuettguetern
US5310321A (en) * 1990-07-24 1994-05-10 Baker Hughes Incorporated Pump system
US6210122B1 (en) * 1996-09-06 2001-04-03 Dyno Industrier Asa Method and delivering an explosive composition
US20050284155A1 (en) * 2004-06-25 2005-12-29 Bhatt Bharat L Zero-clearance ultra-high-pressure gas compressor
US20110255998A1 (en) * 2008-11-21 2011-10-20 Miroslaw Szuster Method and device for pumping liquids using a pneumatic positive displacement pump
US20140169989A1 (en) * 2011-08-09 2014-06-19 Modec, Inc. Bubble lift system and bubble lift method
US20160327032A1 (en) * 2013-12-18 2016-11-10 Mhwirth Gmbh Hot slurry pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111219885A (zh) * 2020-01-19 2020-06-02 侯中泽 一种流体活塞热源泵

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241496A (en) * 1964-02-29 1966-03-22 Tamagawa Kikai Kinzoku Kk Apparatus for pumping slurry and like fluids

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241496A (en) * 1964-02-29 1966-03-22 Tamagawa Kikai Kinzoku Kk Apparatus for pumping slurry and like fluids

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097201A (en) * 1976-01-02 1978-06-27 Nussbaum Gerald F Combined well pump housing and aeration means
US4310491A (en) * 1980-03-05 1982-01-12 Hitachi, Ltd. Apparatus for supplying raw liquid and relieving pressure of high-pressure product liquid
US4378183A (en) * 1980-09-18 1983-03-29 The Pittsburgh & Midway Coal Mining Co. Apparatus and method for pumping hot, erosive slurry of coal solids in coal derived, water immiscible liquid
US4613290A (en) * 1984-04-23 1986-09-23 Lefco Western, Inc. Evacuated pumping system
US4662386A (en) * 1986-04-03 1987-05-05 Sofec, Inc. Subsea petroleum products storage system
US4948349A (en) * 1987-09-22 1990-08-14 Yoshinobu Koiwa Pump and valve apparatus
US5035261A (en) * 1987-09-22 1991-07-30 Yoshinobu Koiwa Pump and valve apparatus
DE3909800A1 (de) * 1989-03-24 1990-09-27 Neuhaeuser Gmbh & Co Membranpumpe zum pneumatischen foerdern von fluidisierten schuettguetern
US5310321A (en) * 1990-07-24 1994-05-10 Baker Hughes Incorporated Pump system
US6210122B1 (en) * 1996-09-06 2001-04-03 Dyno Industrier Asa Method and delivering an explosive composition
US20050284155A1 (en) * 2004-06-25 2005-12-29 Bhatt Bharat L Zero-clearance ultra-high-pressure gas compressor
US7488159B2 (en) * 2004-06-25 2009-02-10 Air Products And Chemicals, Inc. Zero-clearance ultra-high-pressure gas compressor
US20110255998A1 (en) * 2008-11-21 2011-10-20 Miroslaw Szuster Method and device for pumping liquids using a pneumatic positive displacement pump
US8641386B2 (en) * 2008-11-21 2014-02-04 Ekowodrol sp. z o.o. Method and device for pumping liquids using a pneumatic positive displacement pump
US20140169989A1 (en) * 2011-08-09 2014-06-19 Modec, Inc. Bubble lift system and bubble lift method
US9719528B2 (en) * 2011-08-09 2017-08-01 Modec, Inc. Bubble lift system and bubble lift method
US20160327032A1 (en) * 2013-12-18 2016-11-10 Mhwirth Gmbh Hot slurry pump

Also Published As

Publication number Publication date
JPS4936162B1 (enrdf_load_stackoverflow) 1974-09-28
GB1326342A (en) 1973-08-08
ZA712460B (en) 1972-03-29

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