US3841798A - Electromagnetic self-priming pump - Google Patents

Electromagnetic self-priming pump Download PDF

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Publication number
US3841798A
US3841798A US00337076A US33707673A US3841798A US 3841798 A US3841798 A US 3841798A US 00337076 A US00337076 A US 00337076A US 33707673 A US33707673 A US 33707673A US 3841798 A US3841798 A US 3841798A
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United States
Prior art keywords
pump
liquid
members
passage
pumping
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Expired - Lifetime
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US00337076A
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English (en)
Inventor
F Rehfeld
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ODell Manufacturing Inc
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Odell Mfg Inc
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Publication date
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Priority to US00337076A priority Critical patent/US3841798A/en
Priority to CA192,022A priority patent/CA991235A/en
Priority to GB766274A priority patent/GB1451544A/en
Priority to FR7406933A priority patent/FR2220019B1/fr
Priority to JP49022945A priority patent/JPS49118007A/ja
Priority to DE2409659A priority patent/DE2409659A1/de
Application granted granted Critical
Publication of US3841798A publication Critical patent/US3841798A/en
Anticipated expiration legal-status Critical
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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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/123—Flexible valves
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/048—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing around the moving part of the motor

Definitions

  • This invention relates to an electromagnetically driven, self-priming, fluid pump, including a pair of reciprocating pumping pistons which are magnetized to move together when subjected to a magnetic field and are moved apart by yieldable means storing energy in response to the pistons being moved together.
  • Yet another object of the present invention is to provide a self-priming, electromagnetically driven, fluid.
  • each of the pistons having a magnetizable portion and a perimetrical sealing flange portion which seals to the cylinder wall when the piston is moved downstream, but radially collapses to permit fluid to flow thereby when the piston is moved upstream.
  • a further objectof the present invention is to provide a self-priming, electromagnetically driven pump having a pair of aligned, pumping pistons with magnetizable portions, an electromagnetic, flux field creating coil energized by an electrical source of alternating current to alternately magnetize the magnetizable portions in opposite directions on opposite half cycles of the alternating current, and a yieldable member responsive to movement of said portions in one direction to move them in an opposite direction sothat the pumping frequency is twice the alternating current frequency.
  • An electromganetically driven, liquid pump comprising: a pump cylinder defining a liquid passage having a liquid inlet and a liquid outlet; a pair of magnetic field responsive, liquid pumping members which are movable in the passage between spread positions and closed positions for pumping liquid from the inlet to the outlet, an electromagnetic coil for establishing magnetic flux of alternately increasing and decreasing density within the passage to' move the liquid pumping members'to one of the closed and spread positions when the flux density is increasing and permit movement of the piston members to the other of the closed and spread positions when the flux density is decreasing; and an energy storing yieldable member responsive to movement of the liquid pumping members to the one of the closed and spread positions for moving the piston members to the other of the closed and spread positions when the magnetic flux density is decreasing.
  • FIG. 1 is a vertical, sectional view of an electromagnetically driven, liquid pump constructed according to the present invention, taken along the line l-1 of FIG. 2;
  • FIG. 2 is a sectional top plan view of the pump taken along the line 22 of FIG. 1;
  • FIGS. 3 through 6 are sectional side views illustrating various positions of a pair of liquid pumping pistons throughout a pumping cycle.
  • a self-priming, electromagnetic pump constructed according to the present invention is generally designated l0 and includes a ring-shaped, generally rectangular magnetic core, generally designated 12, having a pair of top and bottom legs 14 and 16 and end legs 18 and 20 forming a continuous, closed path for magnetic flux.
  • the iron core 12 may suitably comprise a plurality of stacked, laminations of magnetizable material, to minimize hysteresis losses.
  • a pair of apertures 22 are provided in the upper and lower magnetic core legs 14 and 16 to receive a vertical pump cylinder 24 defining a liquid passage 26 having a lower, inlet end 28 immersed in water, or other fluid to be pumped, and an upper discharge end 30.
  • the cyl- 'inder 24 is fabricated from non-magnetic material such as glass.
  • the pumping piston 32 includes a cylindrical, magnetizable core 36 of, for example, iron bonded to a relatively soft liner of resilient material 38 which terminates in an axially downstream flange 40, normally flaring radially outwardly into sealing engagement with the cylinder wall 24, but being collapsible radially inwardly to the position shown in FIG. 5, permitting fluid to pass thereby.
  • Water W- is forced axially past the resilient liner 38, in the, direction of the arrow b (FIG. 5) in a manner to be later described.
  • the sealing flange 40 engages the cylinder wall 24, the piston 32 moves water axially downstream in the direction of the arrow v j (FIGS. 1 and 6) to the outlet 30.
  • the resilient liner 38 includes an integral end wall 48 having an additional flange portion 46 at the opposite, or upstream, end of the piston 32 which extends axially downstream and normally flares radially outwardly into engagement with the cylinder wall 24, but is collapsible radially inwardly when the piston 32 moves upstream to the position illustrated in FIG. 1 so that water W can move in the direction of the arrow b (FIG. 5) between the flange 46 and the wall 24.
  • the flange 46 in addition to providing a pumping action as it moves downstream toward the outlet 30, also functions to center the piston 32 in the cylinder 24.
  • the liner end wall 48 functions as an energy storing, yieldable cap which covers the lower end wall of the upper piston core 36 and it will be noted that it is provided with a protuberance 48a for a purpose to be presently described.
  • the lower pumping piston 34 includes a magnetizable, elongate, central core 50 bonded to a like liner of resilient material 52.
  • the liner 52 includes an integral terial which covers the upper or downstream end wall of the piston core 50 and has a protuberance or node 54a for engaging the resilient protuberance or node 48a on the upper piston as the pistons 32 and 34 are moved together in a manner to be later described'As the pistons are drawn together, the resilient end portions 48 and 54 are compressed to store energy and, after a predetermined deformation or compression, operate to move the pistons 32 and 34 apart as will also be later described.
  • the upper end resilient portion 54 includes an integral, axially downstream flange 56, identical to the upper piston flange 40, normally flaring radially outwardly into sealing engagement with the cylinder wall, but deflectable or collapsible radially inwardly to permit water-W to pass between theflange 56 and cylinder wall 24.
  • the resilient liner 52 at the axially lower end of the piston 34, includes a centering flange 58 extending axially and normally flaring radially outwardly into sealing engagement with the cylinder wall 24 to pump water W upwardly in the direction of the arrowc (FIG. 1).
  • the flange 58 is similarly deflectable inwardly to perm-it water W to pass thereby.
  • a perforated resilient support disc 60 having apertures 61, permitting the upward flow of water W, is disposed in the lower end of the pumping passage 26 to prevent the lower pumping piston 34 from dropping through the inlet end 28 of the cylinder 24 when the pump is not in operation.
  • the resilient material 48 and 54 may suit.- ably comprise natural, vulcanized rubber or silicone rubber. The material can be selected to provide a spring rate providing the optimum pumping force. Silicone rubber of the type sold underthe trademark RTV-l08 by General Electric Company, Schenectady, New York, has been found suitable for this purpose.
  • An electrically energizable, electromagnetic, toroidal coil 62 surrounds the nonmagnetic pumping cylinder 24 and the pistons 32 and 34 whichtogether effectively netic flux field in the pump passage 26.
  • the flux generated by the coil-62 will follow thepath designated by the arrow d in the direction designated by the arrows 2.
  • the flux generated by the coil 62 will follow the reverse path illustrated in chain lines at 0, in the opposite direction represented by the arrow p.
  • the pump inlet end 28 is immersed in the water W and'the coil leads 64 are connected to the A.C. source 66.
  • the pistons 32 and 34 are initially in the spread positions illustrated in chain lines in FIG. 1 and that the winding 62 is initially energized by a positive half cycle of current alternating so that the flux'emanating from the coil 62 will follow the path d (FIG. 3) to magnetize the piston cores 36 and such that the lower end of the core 36 has a south polarity and the upper end of'the core 50 is of opposite, or north, polarity.'The adjacent ends of the cores will thus be attracted to eachother and the pistons 32 and 34 will move together to'the positions illustrated in FIG. 3.
  • the resilient end portions 48 and 54 engage and are compressed (FIG. 5) to store energy.
  • the electromagnetic coil 62 is then energized by the alternate half cycle of the alternating current to provide flux in the path p to oppositely magnetize the cores 36 and 50 so that the lower end of the upper core 36 is'now of a north polarity and the upper end of the lower core 50 is now of opposite, or south, polarity so that the adjacent ends of the cores 36 and 50are again attracted and the pistons 32 and 34 are again brought together to the positions illustrated in FIG. 5 to diminish the chamber 70 and force the fluid in the chamber 70 upwardly past the upper piston flanges 46 and 40 in the direction of the arrows b and h (FIG. 5).
  • the increasing pressure in the chamber 70 on the downstream side of the upper piston flanges 46 and 40 is greater than the pressure on the upstream side of the flanges 46 and 40 so that the fluid is forced thereby.
  • the pressure exerted by the fluid in the chamber 70 on the downstream side of the lower piston flanges 46 and 58, in the direction of the arrow i (FIG. 5) tends to.
  • the pistons 32 and 34 are thus moved toward and away from each other at times a minute so that the pumping frequency is twice the alternating current frequency.
  • An electromagnetically driven, liquid pump comprising:
  • descriphousing means having an axial liquid passage with an inlet and an outlet; pumping mechanism comprising a pair of axially aligned, magnetizable, liquid pumping means received in said passage, at least one of said pumping means being mounted for axial movement between a removed position in which said pumping means are axially spread to provide a liquid receiving chamber therebetween for receiving liquid from said inlet, and a position in which said pumping means are less spread to pump liquid from said chamber to said outlet;
  • magnetic field producing means for magnetizing said pair of liquid pumping means-such that the axially adjacent ends thereof are of opposite magnetic polarity and attracted toward each other to move at least said one pumping means toward the other;
  • said liquid pumping means comprising elements of magnetizable material disposed in axial prolongation of'each other in said passage;
  • said magnetic field producing means comprising electromagnetic coil means including means for establishing an alternating flux which alternately magnetizes said elements in opposite directions to alternately reverse the polarity of the elements so that the adjacent ends of said elements are of opposite polarity and attracted to each other each time the elements are magnetized; and
  • yieldable means reactable to store energy in response to movement of said one liquid pumping means toward the other to force said one liquid pumping means to said removed position.
  • piston means each include radially collapsible and expandable seal means, engageable with said passage'means in the expanded condition to prevent the flow of fluid toward said inlet, and spaced from said chamber means in the collapsed condition to permit the flow of fluid downstream from said inlet to said outlet.
  • An electromagnetically driven, liquid pump comprising:
  • housing means having an axial liquid passage with an inlet and an outlet;
  • pumping mechanism comprising a pair of axially aligned, magnetizable, liquid pumping means received in said passage, at least one of said pumping means being mounted for axial movement berween a removed position in which said pumping means are axially spread to provide a liquid receiving chamber therebetween for receiving liquid from said inlet, and a position in which said pumping means 'are less spread to pump liquid from said chamber to said outlet;
  • said pumping mechanism comprising a pair of piston means movable between axially spread positions to provide said chamber and less spreadpositions; one of said piston means including means permitting the flow of fluid from said inlet to said chamber when said piston means are moving to said spread positions, butpreventing reverse flow when said piston means are moving together;
  • magnetic field producing means for magnetizing said pair of liquid pumping means such that the axially adjacentends thereof are of opposite magnetic polarity and attracted toward each other to move at least said one pump-means toward the other;
  • yieldable means reactable to store energy in response to movement of said one liquid pumping means toward the other to force said one liquid pumping means to said removed position.
  • An electromagnetically driven, liquid pump comprising:
  • a pump housing having a liquid passage with an inlet and an outlet, said passage being non-magnetizable
  • pump mechanism comprising a pair of magnetic field responsive, liquid pumping means in said passage, at least one of said pumping means being movable toward and away from the other between a removed position in which said pumping means are spread and a position in which said pumping means are less spread;
  • said liquid pumping means comprising a pair of piston means movable toward and away from each other in said passage between spread and closed positions; said piston means providing a variable volume chamber, having a partial vacuum, between said piston means in said spread position for receiving liquid from said inlet;
  • electromagnetic coil means for establishing a magnetic flux field of alternately increasing and decreasing magnetic flux density within said passage to move said one pumping means to one of said positions when said flux density is increasing;
  • said piston means each comprises an element of magnetizable material disposed in axial prolongation of the other element, said electromagnetic coil means includes;
  • said yieldable means being operative to move said piston means to said spread positions when said first flux field is disestablished.
  • An electromagnetic pump comprising:
  • a pump housing having a pumping passage therein with an inlet and an outlet at opposite ends thereof;
  • a pair of magnetic field responsive, liquid pumping piston means disposed in said passage for axial movement toward and away from each other between axially spread positions, and adjacent positions, to pump liquid downstream from said inlet to said outlet;
  • each piston means including a body of magnetizable material
  • resilient seal means surrounding said body and having a perimetrical flange portion, extending radially outwardly, sealingly engageable with the walls of said passage when said piston means is moving downsteam to prevent fluid from returning upstream, but collapsible radially inwardly when said piston means is moving upstream to permit fluid to pass.
  • the pump of claim 11 including support means in said passage axially outwardly of one of said piston means to limit the axial movement of said one piston means in a direction away from the other piston means.
  • an electromagnetic coil connected with said source and means providing an alternating flux field in said passage which alternately magnetizes said magnetizable portions in opposite directions with opposite half cycles of said flux field to cause said magnetizable portions to be attracted and moved toward each other on each half cycle of the flux;
  • a liquid pump adapted to be operated by a source of electric current comprising: a pump housing having an axially extending liquid passage with an inlet and an outlet; a liquid pumping mechanism including axially spaced members, at least one of said members comprising a magnetizable liquid pumping structure, having a to-and-fro stroke, mounted for axial pumping movement in said passage between a removed position in which said members are axially spread to provide a liquid receiving chamber therebetween for receiving liquid from said inlet, and a less spread position in which .said members are more closely spaced; said pumping mechanism including seal means for admitting liquid to said chamber while otherwise restricting backflow and permitting liquid to be pumped in a downstream direction fromsaid chamber to said outlet while otherwise restricting backflow, and including collapsible resilient seal means projecting generally laterally outwardly from the perimeter of at least said'one member to engage the housing portion defining said liquid passage; and an assembly for cyclically moving at least said one member relative to the other member, including magnetic field creating means connected with said
  • said magnetizable member comprises a magnetizable core with a sheath having said seal means in the form of a flange which flares axially in a downstream direction.
  • a liquid pump adapted to be operated by a source of electric current comprising: a pump housing having a non-magnetizable, magnetic flux permeable, axially extending liquid passage with an inlet and an outlet; a liquid pumping mechanism including axially spaced magnetizable members having magnetically confronting portions, atleast one of said members comprising a liquid pumping structure, having a to-andfro stroke, mounted for axial pumping movement in said passage between a removed position in which said magnetizing members are axially spread to provide a liquid receiving chamber therebetween for receiving liquid from said inlet, and a less spread position in which said magnetizing members are magnetically interreactive; and an assembly for cyclically moving at least said one member relative to the other member, said assembly including magnetic field creating means connected with said source, and continuously providing an alternating flux field of predetermined frequency, with flux half cycles of opposite polarity, which alternately magnetizes the confronting portions of said magnetizable .members during opposite half cycles of said flux field to cause said members to magnetic
  • said magnetic field creating means comprises a coil for magnetizing the confronting portions of said members so that they are of opposite magnetic polarity and attract one another.
  • a bias ing device is provided for returning said one magnetizable member to original position at the end of each flux half cycle, and comprises yieldable means reactable to store energy in response to movement of said one member toward the other.
  • valve structure comprises radially collapsible and expandable perimetral seals provided on said members which are engageable with the passage in an expanded condition to prevent the flow of fluid toward the outlet, and spaced from the passage in the collapsed condition to permit the flow of fluid toward the outlet.
  • va deformable resilient rubber element is provided between said members to restore the spread disposition of members.
  • magnetizable members comprise movable pistons in said passage and structure provided for returning said one magnetizable member to original position returns both members to original position and is disposed between and reactable with both pistons.
  • yieldable energy storing means to return the members to spread disposition comprises a resilient protrusion on at least one of said members.
  • said yieldable energy storing means comprises a central protrusion on each of said members which are engaged and deformed when the members move together, and resiliently move the members to spread positions at the end of each flux half cycle.
  • a liquid pump adapted to be operated by a source of electric current comprising: a pump housing having an axially extending liquid passage with an inlet and an outlet; a liquid pumping mechanism including axially spaced magnetizable members, at least one of said members comprising a liquid pumping structure, having a to-and-fro stroke, mounted for axial pumping movement in said passage between a removed position in which said magnetizable members are axially spread to provide a liquid receiving chamber therebetween for receiving liquid from said inlet, and a less spread position; an assembly for cyclically moving at least said one member relative to the other member; said assembly including magnetic field creating means connected with said source, and continuously providing an alternating flux field of predetermined frequency, with flux half cycles of opposite polarity, which alternately oppositely polarize said magnetizable members during opposite half cycles of said flux field to cause at least said one member to be moved in the same direction during each half cycle of the flux field; and resilient means for returning said one member in the opposite direction during each half cycle of the flux field.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Reciprocating Pumps (AREA)
US00337076A 1973-03-01 1973-03-01 Electromagnetic self-priming pump Expired - Lifetime US3841798A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00337076A US3841798A (en) 1973-03-01 1973-03-01 Electromagnetic self-priming pump
CA192,022A CA991235A (en) 1973-03-01 1974-02-07 Electromagnetic self-priming pump
GB766274A GB1451544A (en) 1973-03-01 1974-02-20 Liquid pump
FR7406933A FR2220019B1 (enrdf_load_stackoverflow) 1973-03-01 1974-02-28
JP49022945A JPS49118007A (enrdf_load_stackoverflow) 1973-03-01 1974-02-28
DE2409659A DE2409659A1 (de) 1973-03-01 1974-02-28 Elektromagnetisch angetriebene, selbsttaetig ansaugende pumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00337076A US3841798A (en) 1973-03-01 1973-03-01 Electromagnetic self-priming pump

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US3841798A true US3841798A (en) 1974-10-15

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US00337076A Expired - Lifetime US3841798A (en) 1973-03-01 1973-03-01 Electromagnetic self-priming pump

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US (1) US3841798A (enrdf_load_stackoverflow)
JP (1) JPS49118007A (enrdf_load_stackoverflow)
CA (1) CA991235A (enrdf_load_stackoverflow)
DE (1) DE2409659A1 (enrdf_load_stackoverflow)
FR (1) FR2220019B1 (enrdf_load_stackoverflow)
GB (1) GB1451544A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500265A (en) * 1983-01-28 1985-02-19 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Magnetically actuated compressor
US4835426A (en) * 1987-06-27 1989-05-30 Unimax Switch Limited Solenoid-operated valves
US5395218A (en) * 1994-01-19 1995-03-07 Thompson; Lee H. Fluid pump apparatus
US6565335B1 (en) * 1999-10-21 2003-05-20 Yoshio Yano Vertical pump
US20090180905A1 (en) * 2006-07-05 2009-07-16 Heinz Kueck Pump element and pump having such a pump element
US20120097163A1 (en) * 2009-06-05 2012-04-26 Fisher & Paykel Healthcare Limited Humidifier heater base
CN108131268A (zh) * 2018-02-06 2018-06-08 西北农林科技大学 一种呼吸泵

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132930A1 (de) * 1991-10-04 1993-04-08 Teves Gmbh Alfred Pumpe

Citations (6)

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Publication number Priority date Publication date Assignee Title
US2468343A (en) * 1947-08-26 1949-04-26 Bendix Aviat Corp Reciprocatory electromagnetic motor
US2495598A (en) * 1945-12-19 1950-01-24 Bendix Aviat Corp Electrically operated pump
GB823109A (en) * 1956-04-13 1959-11-04 Chausson Usines Sa Improvements in or relating to compressors
US3486456A (en) * 1968-03-14 1969-12-30 Bendix Corp Valving for electromagnetic pump
US3542495A (en) * 1965-09-24 1970-11-24 Maurice Barthalon Reciprocating electric motor
US3629674A (en) * 1970-06-18 1971-12-21 Bendix Corp Transient resistant transistorized blocking oscillator for switching inductive loads

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495598A (en) * 1945-12-19 1950-01-24 Bendix Aviat Corp Electrically operated pump
US2468343A (en) * 1947-08-26 1949-04-26 Bendix Aviat Corp Reciprocatory electromagnetic motor
GB823109A (en) * 1956-04-13 1959-11-04 Chausson Usines Sa Improvements in or relating to compressors
US3542495A (en) * 1965-09-24 1970-11-24 Maurice Barthalon Reciprocating electric motor
US3486456A (en) * 1968-03-14 1969-12-30 Bendix Corp Valving for electromagnetic pump
US3629674A (en) * 1970-06-18 1971-12-21 Bendix Corp Transient resistant transistorized blocking oscillator for switching inductive loads

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500265A (en) * 1983-01-28 1985-02-19 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Magnetically actuated compressor
US4835426A (en) * 1987-06-27 1989-05-30 Unimax Switch Limited Solenoid-operated valves
US5395218A (en) * 1994-01-19 1995-03-07 Thompson; Lee H. Fluid pump apparatus
US6565335B1 (en) * 1999-10-21 2003-05-20 Yoshio Yano Vertical pump
US8241019B2 (en) 2006-07-05 2012-08-14 Hahn-Schickard-Gesellschaft Fuer Angewandte Forschung E.V. Pump element and pump having such a pump element
US20090180905A1 (en) * 2006-07-05 2009-07-16 Heinz Kueck Pump element and pump having such a pump element
US20120097163A1 (en) * 2009-06-05 2012-04-26 Fisher & Paykel Healthcare Limited Humidifier heater base
US9174017B2 (en) * 2009-06-05 2015-11-03 Fisher & Paykel Healthcare Limited Humidifier heater base
US10252019B2 (en) 2009-06-05 2019-04-09 Fisher & Paykel Healthcare Limited Humidifier heater base
US11273281B2 (en) 2009-06-05 2022-03-15 Fisher & Paykel Healthcare Limited Humidifier heater base
US12201777B2 (en) 2009-06-05 2025-01-21 Fisher & Paykel Healthcare Limited Humidifier heater base
CN108131268A (zh) * 2018-02-06 2018-06-08 西北农林科技大学 一种呼吸泵
CN108131268B (zh) * 2018-02-06 2024-03-15 西北农林科技大学 一种呼吸泵

Also Published As

Publication number Publication date
CA991235A (en) 1976-06-15
DE2409659A1 (de) 1974-09-12
GB1451544A (en) 1976-10-06
JPS49118007A (enrdf_load_stackoverflow) 1974-11-12
FR2220019A1 (enrdf_load_stackoverflow) 1974-09-27
FR2220019B1 (enrdf_load_stackoverflow) 1977-06-10

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