EP0561494A2 - Pompe moineau - Google Patents

Pompe moineau Download PDF

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Publication number
EP0561494A2
EP0561494A2 EP93300805A EP93300805A EP0561494A2 EP 0561494 A2 EP0561494 A2 EP 0561494A2 EP 93300805 A EP93300805 A EP 93300805A EP 93300805 A EP93300805 A EP 93300805A EP 0561494 A2 EP0561494 A2 EP 0561494A2
Authority
EP
European Patent Office
Prior art keywords
pump
pumping
pressure chamber
valve
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93300805A
Other languages
German (de)
English (en)
Other versions
EP0561494A3 (fr
Inventor
Stanley Ashbourne Eaton Payne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FLUID HOLDINGS Ltd
Original Assignee
FLUID HOLDINGS Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FLUID HOLDINGS Ltd filed Critical FLUID HOLDINGS Ltd
Publication of EP0561494A2 publication Critical patent/EP0561494A2/fr
Publication of EP0561494A3 publication Critical patent/EP0561494A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0053—Venting means for starting

Definitions

  • THIS INVENTION relates to a positive displacement pump, to a method of operation thereof, to a start-up accessory for a positive displacement pump and to a pumping installation.
  • a method of operating a positive displacement pump arranged to deliver a fluid from a pressure chamber of the pump via a pumping outlet into a delivery conduit against a relatively high head including directing delivery of the pump, initially, during start-up, via a bypass outlet against a relatively low head or substantially no head, and only after start-up has occurred re-directing the delivery via said pumping outlet into the delivery conduit at said relatively high head.
  • the method may include, when no flow is taking place, automatically communicating said bypass outlet with the pressure chamber of the pump, and, when flow has reached a predetermined volume or velocity, automatically closing the bypass outlet.
  • This may be effected by means of a valve which is arranged in the bypass outlet and which is normally open, e.g. by providing a valve element or closure which is biassed to an open condition and which is arranged to be swept against its seat to a closed condition when such predetermined volume or velocity is attained.
  • the method may further include automatically preventing return flow from taking place from the delivery conduit into the pressure chamber when pumping is not taking place by means of a non-return valve intermediate the pressure chamber and the delivery conduit.
  • the method may be applied to a positive displacement pump forming part of a pumping installation, especially a borehole pumping installation, in which water or other fluid is pumped into a rising main, the method including exhausting flow through the bypass outlet into a body of water from which pumping takes place, e.g. the borehole, external of the rising main.
  • a positive displacement pump including a pressure chamber having a pumping outlet which is connectable to a delivery conduit, the pump including a bypass outlet in communication with the pressure chamber and a valve in the bypass outlet arranged to be open when the pump is not operative and to close automatically when a predetermined pumping volume or velocity is attained in use.
  • bypass outlet may be arranged to be upwardly directed in use, the valve having a downwardly directed seat and a valve element or closure which is biassed downwardly under gravity, and which is arranged to be swept upwardly against gravity onto the seat when said flow of predetermined volume or velocity occurs.
  • the invention may advantageously be applied to a positive displacement pump which is in the form of a submersible progressive cavity pump, e.g. a borehole pump, the pump having connection means for connection to a rising main and a foot valve associated with or proximate said connection means, and the bypass outlet being arranged to be in communicating with a body of fluid, e.g. the borehole, external of the rising main in use.
  • a positive displacement pump which is in the form of a submersible progressive cavity pump, e.g. a borehole pump, the pump having connection means for connection to a rising main and a foot valve associated with or proximate said connection means, and the bypass outlet being arranged to be in communicating with a body of fluid, e.g. the borehole, external of the rising main in use.
  • a start-up accessory for a positive displacement pump comprising means for mounting it in communication with a pressure chamber of the pump, a bypass outlet arranged in relation to said mounting means to be communicated with a pressure chamber of the pump in use and a valve in the bypass outlet which valve is arranged to be open when the pump is not operative and to close automatically when a predetermined pumping volume or velocity is attained in use.
  • a pumping installation comprising a positive displacement pump submerged in a body of fluid to be pumped and including a pressure chamber having a pumping outlet; a rising main communicated with the pressure chamber via the pumping outlet, the pump having a bypass outlet communicated with the pressure chamber and a valve in the bypass outlet which valve is arranged to be open when the pump is not operative and to close automatically when a predetermined pumping volume or velocity is attained in operation.
  • the pumping installation may be a borehole pumping installation.
  • the pump may have a foot valve associated with the pumping outlet.
  • the positive displacement pump may be in the form of a progressive cavity pump.
  • a pump in accordance with the invention is generally indicated by reference numeral 10. It is a positive displacement pump of the progressive cavity kind and is suitable for use submerged in a borehole. It is also suitable for use submerged in a body of another kind of fluid to be pumped. For convenience, pumping water from a borehole is described by way of example.
  • the pump 10 comprises an outer cylindrical casing 12 including a lower section 14, an upper section 16 and a socket 18 interconnecting the lower and upper sections 14, 16.
  • a lower stator 20 comprising an outer barrel 22 having an outer periphery 24 which is moulded within the lower section 14. It further comprises a sleeve 26 arranged integrally with the barrel 22, canti-lever fashion.
  • the sleeve 26 has an inner periphery 28 defining a female helical groove with a predetermined number of starts.
  • the pump 10 comprises an upper stator 30 which is of similar construction to the lower stator 20 and like reference numerals refer to like components.
  • the lower and upper stators 20, 30 are provided in register in series. It is to be appreciated that the lower and upper stators 20, 30 are moulded of a resilient synthetic plastics material.
  • a complemental rotor 40 having an outer periphery 42 formed of a male helical formation having a predetermined number of starts which number is either one more or one fewer than the number of starts of the stators.
  • the rotor in this embodiment, is of corrosion resistant metal e.g. stainless steel.
  • the pump 10 is driven from a submersible motor 59 via a driving rod 44.
  • the driving rod 44 is flexibly connected to respectively the motor 59 and the rotor 40 by means of flexible couplings 46.
  • the pump 10 further comprises a stator adaptor intake 48 screwed to a lower end of the cylindrical casing 12 and having female screw threaded connecting means 50 for connection to the motor 59 and a strainer or the like to prevent ingress of particulate material.
  • a stator adaptor top 52 connected as shown at 54 to a top of the cylindrical casing 12 and having a female screw threaded connecting means 56 mounting a non-return valve arrangement 80.
  • the non-return valve arrangement 80 mounts the rising main 58 as shown at 86.
  • a pumping outlet 79 is provided from the pressure chamber 62 via the valve arrangement 80 into the rising main 58.
  • the non-return valve arrangement 80 comprises a casing 82 defining, immediately above male connection means 84 engaged with the female connection means 56, a divergence 88 and above that a cavity 92 within which a spherical closure 94 is provided.
  • a concave seat 90 is defined by the divergence 88.
  • the spherical valve element or closure 94 When pumping is not in operation, the spherical valve element or closure 94 is biassed under gravity onto the seat 90 and it acts as a foot valve for water in the rising main 58, in conventional fashion.
  • a transverse pin 95 is provided through the cavity 92 to limit upward displacement of the valve element or closure 94 in use.
  • the pump 10 further has starting means 60 provided in the stator adaptor top 52 and which will be described hereinafter.
  • the pump 10 is submerged in water in the borehole and that the cavities intermediate the rotor 40 and the stators 20, 30, as well as an intermediate pressure chamber 61 intermediate the lower stator 20 and the upper stator 30, as well as a pressure chamber 62 above the stator 30 will be flooded with water.
  • the non-return valve 80 maintains a column of water in the rising main 58. Thus, when the pump is restarted, water is immediately pumped into the pressure chamber 62 and thence into the rising main 58 when sufficient pressure has been generated to open the non-return valve 80.
  • the pump 10 in general and more specifically the interfaces between the outer periphery 42 of the rotor 40 and the inner peripheries 28, 38 of the stators 20, 30 are under full pressure.
  • the relative speed of the components across the interfaces mentioned above is too low to generate a lubrication film of water in the interface, or is too low to maintain such a lubrication film where it may be formed.
  • at least a certain amount of binding between the rotor 40 and the stators 20, 30 takes place. Only when the normal operating rotation speed of the rotor is approached are the basic seal lines in said interfaces allowed to attain a suitable velocity so that the lubricating film is maintained in those interfaces.
  • the driving rod 44 has flexible couplings 46 as illustrated in Figure 3.
  • Each coupling 46 has, at opposed ends, metal attachment formations 46.1, 46.2 for attachment to respectively the driving rod 44 and either the drive shaft of the motor 59 or the rotor 40.
  • an anchor disc 46.3 Integral with each attachment formation 46.1, 46.2, there is provided an anchor disc 46.3.
  • the anchor discs 46.3 are moulded into a body 46.4 in the form of a moulding of an appropriate flexible synthetic plastics material.
  • the rotor 40 orbits about a centre line through the casing 12, ie it does not rotate on axis.
  • the flexible couplings 46 allow flexing respectively between the motor 59 and the drive shaft 44, and between the drive shaft 44 and the rotor 40. This is conducive to smooth operation of the pump and ameliorates wear of the rotor 40 and also of the motor bearings.
  • the couplings should be designed for a torque as close as possible to the actual operating torque, and then the maximum torque which they can be subjected to is only a limited amount higher than the design torque.
  • the maximum torque ie the starting torque
  • the flexible couplings have to be designed to be able to withstand the maximum torque. This results in flexible couplings being much more stiff than what is required for the actual operating torque and prevents full use being made of the advantage of the flexible couplings as described above.
  • the starting means 60 is provided which includes a bypass conduit 64 having an inlet 66 in the pressure chamber 62 and an exhaust 68 in the borehole external of the rising main 58.
  • a valve generally indicated by reference numeral 70 and comprising a downwardly directed concave seat 72 proximate the exhaust 68, and a spherical valve element or closure 74 complemental to the concave seat 72 and movable between an open condition (shown in solid) in which it is spaced from the concave seat 72, and a closed condition (shown in dotted) in which it seats on the concave seat 72.
  • the spherical valve element or closure 74 is retained within the conduit 64 by means of a transverse retaining pin 76.
  • the valve element or closure 74 is received in the bypass conduit with clearance to allow passage of water when in its open condition.
  • valves such as poppet-type valves may be used, valve elements of shapes other than spherical may be used, retention within the conduit may be by means of retention means other than a pin, and the like.
  • the valve 70 is normally closed. Prior to start-up, the spherical valve element or closure 74 is biassed under gravity away from the concave seat 72 and lies against the retaining pin 76. Thus, the pressure chamber 62 is in communication with the water in the borehole and the pressure in the pressure chamber which is equivalent to the head against which pumping will commence is commensurate with the level of water in the borehole above the pump rather than the normal operating head in the rising main 58. The pressure or head is thus relatively low.
  • the water being pumped will follow the route of least resistance and will thus predominantly be pumped through the starting means 60.
  • the volume of water being pumped attains a specific value i.e. the velocity in the bypass conduit 64 attains a specific value
  • the spherical valve element or closure 74 is swept by means of the flowstream of water against the concave seat 72 and it closes off the bypass conduit 64.
  • pressure in the pressure chamber 62 increases immediately thus generating a pressure gradient over the bypass conduit 64 and the exhaust 68 which pressure gradient is sufficient to maintain the spherical valve element or closure 74 in its closed condition against the concave seat 72.
  • sufficient pressure is virtually immediately generated to open the non-return valve 80, and water being pumped is then pumped into the rising main 58 and operation of the pump 10 continues in conventional fashion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19930300805 1992-02-17 1993-02-03 Pompe moineau Withdrawn EP0561494A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA921133 1992-02-17
ZA921133 1992-02-17

Publications (2)

Publication Number Publication Date
EP0561494A2 true EP0561494A2 (fr) 1993-09-22
EP0561494A3 EP0561494A3 (fr) 1993-11-03

Family

ID=25581398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930300805 Withdrawn EP0561494A3 (fr) 1992-02-17 1993-02-03 Pompe moineau

Country Status (4)

Country Link
EP (1) EP0561494A3 (fr)
AU (1) AU3297193A (fr)
ZA (1) ZA93900B (fr)
ZW (1) ZW1993A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641937A1 (fr) * 1993-09-07 1995-03-08 Joh. Heinr. Bornemann GmbH + Co. KG Pompe Moineau
US5820354A (en) * 1996-11-08 1998-10-13 Robbins & Myers, Inc. Cascaded progressing cavity pump system
GB2338268A (en) * 1998-02-24 1999-12-15 Orbit Pumps Ltd Stator assembly
US6497556B2 (en) 2001-04-24 2002-12-24 Cdx Gas, Llc Fluid level control for a downhole well pumping system
US6604910B1 (en) 2001-04-24 2003-08-12 Cdx Gas, Llc Fluid controlled pumping system and method
RU2256098C1 (ru) * 2003-10-23 2005-07-10 Открытое акционерное общество Научно-производственное объединение "Искра" Одновинтовой насос
RU2256819C1 (ru) * 2003-10-23 2005-07-20 Центр Разработки Нефтедобывающего Оборудования ("Црно") Погружной одновинтовой насос для добычи нефти
RU2268397C1 (ru) * 2004-06-02 2006-01-20 Закрытое акционерное общество "Электон" Погружная насосная установка
CN101382131B (zh) * 2008-10-15 2010-06-16 马子奇 可试压井下采油螺杆泵
US8267677B2 (en) 2005-10-03 2012-09-18 Flowrox Oy Gasket part for a pump
CN105889062A (zh) * 2016-05-10 2016-08-24 辽宁新华仪器有限公司 螺杆泵传动装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2267459A (en) * 1939-01-09 1941-12-23 Fmc Corp Deep well pump
US3362335A (en) * 1966-03-07 1968-01-09 Borg Warner Control system for fluid pressure source
US3857517A (en) * 1972-11-13 1974-12-31 Environment One Corp Anti-siphon and pump priming for sewage grinder pump
US4416592A (en) * 1981-04-15 1983-11-22 Sid Harvey, Inc. Liquid flow control apparatus
GB2157766B (en) * 1984-04-25 1988-01-20 Facet Enterprises Rotary fuel-pump for an i.c.engine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641937A1 (fr) * 1993-09-07 1995-03-08 Joh. Heinr. Bornemann GmbH + Co. KG Pompe Moineau
US5820354A (en) * 1996-11-08 1998-10-13 Robbins & Myers, Inc. Cascaded progressing cavity pump system
GB2338268A (en) * 1998-02-24 1999-12-15 Orbit Pumps Ltd Stator assembly
US6497556B2 (en) 2001-04-24 2002-12-24 Cdx Gas, Llc Fluid level control for a downhole well pumping system
US6604910B1 (en) 2001-04-24 2003-08-12 Cdx Gas, Llc Fluid controlled pumping system and method
US6945755B2 (en) 2001-04-24 2005-09-20 Cdx Gas, Llc Fluid controlled pumping system and method
RU2256098C1 (ru) * 2003-10-23 2005-07-10 Открытое акционерное общество Научно-производственное объединение "Искра" Одновинтовой насос
RU2256819C1 (ru) * 2003-10-23 2005-07-20 Центр Разработки Нефтедобывающего Оборудования ("Црно") Погружной одновинтовой насос для добычи нефти
RU2268397C1 (ru) * 2004-06-02 2006-01-20 Закрытое акционерное общество "Электон" Погружная насосная установка
US8267677B2 (en) 2005-10-03 2012-09-18 Flowrox Oy Gasket part for a pump
CN101382131B (zh) * 2008-10-15 2010-06-16 马子奇 可试压井下采油螺杆泵
CN105889062A (zh) * 2016-05-10 2016-08-24 辽宁新华仪器有限公司 螺杆泵传动装置

Also Published As

Publication number Publication date
EP0561494A3 (fr) 1993-11-03
ZW1993A1 (en) 1993-06-02
AU3297193A (en) 1993-08-19
ZA93900B (en) 1993-09-10

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