EP0100627A1 - Helical gear pump - Google Patents
Helical gear pump Download PDFInfo
- Publication number
- EP0100627A1 EP0100627A1 EP83304217A EP83304217A EP0100627A1 EP 0100627 A1 EP0100627 A1 EP 0100627A1 EP 83304217 A EP83304217 A EP 83304217A EP 83304217 A EP83304217 A EP 83304217A EP 0100627 A1 EP0100627 A1 EP 0100627A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- stator
- pump
- shaft
- stators
- 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.)
- Granted
Links
- 238000012384 transportation and delivery Methods 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 239000012858 resilient material Substances 0.000 claims abstract description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 22
- 230000000630 rising effect Effects 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 210000004907 gland Anatomy 0.000 claims description 5
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Images
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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1076—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member orbits or wobbles relative to the other member which rotates around a fixed axis
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
Definitions
- Each of these types includes an inner member, usually a rotor, and an outer member, which is usually in the form of a stator.
- the rotor has an external helical gear form with n starts.
- the stator has a complementary internal helical gear form with n ⁇ 1 starts.
- One of the said members, usually the stator, is of resilient material.
- Such pumps are capable of delivering against high delivery pressures, and are suitable for borehole pumps. They require good sealing and hence adequate initial interference between inner and outer members, so that interference and hence sealing will not be lost completely when the resilient member deforms under pump delivery pressure. However, such adequate initial interference may result in a high starting torque being required. Such a high starting torque may be a drawback when the pump is to be hand-operated.
- the invention provides a helical gear pump having an inlet and an outlet, and which includes
- the stators may be mounted in an outer sleeve having connecting means for connection to a delivery outlet. It may be a stator remote from the connecting means which has its outer wall unconstrained along a portion of its length. There may be provided a plurality of stators which have their outer walls unconstrained against radial inward movement along portions of their lengths.
- the invention extends to a borehole pump installation, which includes
- the source of rotary power may be provided by manually-operable means which includes an arm operatively connected to the shaft, the arm having a handle whereby the shaft may be rotated about its axis relative to the rising main.
- the manually-operable means may include a pedestal mounted over and connected to the upper end of the rising main, the upper end of the pedestal supporting a bearing for the arm and having a clutch device to permit rotation of the arm in one direction only, about the rotational axis of the rotor.
- the pedestal may have a water outlet below the level of the bearing, and a sealing gland below the bearing, but above the water outlet, the shaft being adapted to pass sealingly through the sealing gland.
- the water outlet may be in the form of a spout directed downwardly from the pedestal.
- An upwardly directed baffle may be provided at the inner end of the spout.
- the invention extends to manually-operable means which includes a pedestal having mounting means for mounting it over the mouth of a borehole, and over the upper end of the rising main of an installation as described, and which has an arm operatively connectable via the connecting means to the shaft of the said installation, the arm being rotatably supported at the upper end of the pedestal about an axis which in use is co-axial with the shaft of the said installation.
- the rotational support of the arm by the pedestal may be provided by a bearing, and the pedestal may have a sealing gland below the bearing to permit the shaft to pass sealingly therethrough.
- the arm may be provided with gripping means for co- operating with the connecting means, the gripping means including two bushes in a transverse bore intersected by a longitudinal bore to accommodate the shaft, and the two bushes in use being urged together by a bolt passing through them to grip the shaft where it intersects the transverse bore.
- the source of rotary power may be provided by a windmill-operated rotary drive having its output operatively connected to the shaft.
- a helical gear pump which includes at least two resilient outer members arranged in series around an inner member, the inner and outer members being adapted to rotate and orbit relative to each other about a longitudinal axis
- the outer members may be stators and the inner member may be a rotor, the rotor being adapted to rotate and orbit inside the stators.
- a borehole generally indicated by reference numeral 10. It has a borehole casing 12 within which a rising main 14 is centrally located by stabilizers 16 arranged at axially spaced intervals within the casing 12.
- a helical gear pump 18, according to the invention, is mounted at the lower end of the rising main 14.
- a foot valve and strainer 20 is provided below the pump 18.
- the pump 18 has a shaft 22 located centrally within the rising main 14 by bobbin bearings 24. Rotary power is applied to the shaft 22 by means of manually-operable means in the form of a hand pump arm 26 of a hand pump head, generally indicated by reference numeral 27.
- the hand pump arm 26 is rotatably mounted on pedestal 28 which is mounted by means of a base member 30 over the borehole 10.
- the pedestal 28 has a delivery or outlet pipe 32 which is provided with a baffle 34 on the inside of the pedestal so as to prevent the introduction of foreign matter into the pedestal 28 from outside, via the outlet pipe 32.
- the base member 30 is mounted on a concrete block 36 cast into the soil 38 around the mouth of the borehole 10.
- the pump 18 comprises a cylindrical casing 40 connected to the lower end of the rising main 14 (not shown).
- stators 42.1 and 42.2 are mounted sealingly in tandem around the rotor 44.
- the ring 45 is arranged at the suction end of the stator 42.2.
- the rotor 44 is connected to the lower end of the shaft 22.
- the stator 42.1 is moulded into casing 42.11 which is attached to the casing 40.
- the stator 42.2 is moulded into ring 45 which is attached to the casing.
- a clearance space 48 is provided around the upper end of the stator 42.2.
- the rotor 44 will be arranged to have conventional radial interference with the stator 42.1, and little radial interference with the stator 42.2.
- the stators 42.1 and 42.2 are also arranged in timed relationship with each other relative to the rotor 44 and are held in position in the casing 40. Under no load, the radial interference between the rotor 44 and the inner surface of the stator 42.2 will be less than the radial interference between the rotor 44 and the inner surface of the stator 42.1.
- the shaft 22 is sufficiently flexible to take up the eccentricity of the rotor orbiting within the stator. It is therefore not necessary to have flexible connectors, such as universal joints and so on, in line with shaft 22.
- the shaft 22 is made up of a number of sections joined end-to-end.
- stator 42.3 is also sealingly mounted in similar fashion to the stator 42.2 within the casing 40.
- Rotor 44 and stator 42.2 of Figure 3 operate in the same way as described for the stator 42.2 and the rotor 44 of Figure 2.
- the stators 42.2 and 42.3 of Figure 3 are also arranged in timed relationship relative to each other and relative to the rotor 44, and are held in position in the casing 40.
- the delivery pressure at the outlet from the stator 42.3 will act on the outside of the stator in the clearance space 48 and will balance to some degree the internal pressure inside the stator 42.3. Thus, sealing interference between the stator 42.3 and the rotor 44 will be substantially maintained so that delivery can take place even under a high head.
- a hand pump head 27 which includes the pedestal 28 rotatably supporting the arm 26 via anti-friction bearing 60.
- the arm 26 has a ratchet device 62 to prevent it from being turned in the wrong direction.
- the teeth for the ratchet device 62 and bearing 60 are mounted in a plug 64 which is located in the upper end of the pedestal 28.
- the shaft 22 passes through seals 66 which engage sealingly with the shaft 22 along its outer surface.
- the shaft 22 is locked in relation to. the arm 26 by gripping means which includes bushes 68 and 70 urged together by a bolt 72 passing with clearance through them.
- the bushes have faces 68.1 and 70.1 urged into gripping relationship with the shaft 22 by means of the bolt 72.
- the bushes are located axially in a bore 74 which is intersected by the shaft 22. If desired, the ends of the bore 72 are closed off by plugs 76 and 78 to prevent tampering with the locking arrangement on the shaft 22.
- the bolt 72 is provided with a socket head 72.1, further to discourage tampering if the cover 76 should be removed. In Figure 4 the plug 78 is shown removed.
- the stator has three starts and the rotor has two starts.
- the lower ends of the casing is conveniently threaded to engage with a foot valve or a foot valve and strainer 20.
- the direction of rotation of the rotor is arranged to take place in such a direction that water will be pumped upwardly.
- the upper ends of the stators 42.2 will be subjected to partial delivery pressure.
- the upper ends of the stators 42.1 and 42.3 will, on the other hand, be subjected to full delivery pressure. This is the pressure which is applied to the clearance spaces 48.
- the interference between the rotor and the stators 42.2 and 42.3 can be minimal.
- pressure builds up however, a tendency for the stators to expand under internal pressure can be cancelled or counteracted or compensated for by the external pressure around the outside of the stators, in the clearance spaces mentioned. It is thus possible to start with minimal interference between the rotor and the stators, yet without the danger of losing necessary sealing interference, as pressure builds up inside the stators.
- compensating stators 42.2 and 42.3 Because of the compensating effect which the delivery pressure has on the outer surfaces of the stators 42.2 and 42.3, they may for brevity be referred to as compensating stators.
- the hand pump embodiment shown in the drawings shows the handle connected directly to the pump shaft without an intermediate gear ratio. It is possible to have the pump shaft driven via a step-down or step-up drive to drive it slower or faster than the handle. Such a drive may be provided by chain and sprockets, V-belts and pulleys, or a gear drive with toothed gearwheels.
- the pump shaft may also be driven by a rotary windmill-driven shaft directly or via a step-up or step- down drive.
- a pump according to the invention having a compensating stator, also has advantages in pumping hot liquids or in pumping cold liquids which later become hot.
- the moulded-to metal stator 42.1 In order to allow for temperature, the moulded-to metal stator 42.1 must have greater initial clearance at low temperature. This would result in poor performance in the cold condition, if used alone, because of excessive clearance.
- the addition of a compensating stator 42.2 ensures adequate performance in the cold condition. As temperature rises, so the stator 42.1 expands, thereby taking up the greater initial clearance and providing required interference and hence good sealing at the final operating temperature.
- helical gear pumps having stators arranged in series in accordance with the invention, have low starting torques in practice yet have adequate deliveries even at high heads and at low speeds, without excessive torque requirements.
- helical gear pumps are very suitable for use as hand pumps on boreholes.
- a pump having a series mounting of compensating stators has an increased efficiency over a pump having a single compensating stator of a length equivalent to the series-mounted compensating stators.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
- The Applicants are aware of different types of helical gear pumps. Each of these types includes an inner member, usually a rotor, and an outer member, which is usually in the form of a stator. The rotor has an external helical gear form with n starts. The stator has a complementary internal helical gear form with n ± 1 starts. One of the said members, usually the stator, is of resilient material.
- In use, when rotary power is applied to the rotor, it rotates and orbits within the stator and, in engaging sealingly with the inner surface of the stator, causes pumping to take place by postive displacement of the rotor in the stator.
- Such pumps are capable of delivering against high delivery pressures, and are suitable for borehole pumps. They require good sealing and hence adequate initial interference between inner and outer members, so that interference and hence sealing will not be lost completely when the resilient member deforms under pump delivery pressure. However, such adequate initial interference may result in a high starting torque being required. Such a high starting torque may be a drawback when the pump is to be hand-operated.
- It is an object of this invention to provide a pump of this type, having a low starting torque, and thereby making it suitable for use as a hand pump, capable of pumping from a deep well or borehole.
- Accordingly, the invention, according to one aspect, provides a helical gear pump having an inlet and an outlet, and which includes
- a rotor rotatably mounted about a longitudinal axis; and
- at least two stators of resilient material mounted operatively in series around the rotor, at least one of the stators having an outer wall which is unconstrained against radial inward movement along a portion of its length.
- The stators may be mounted in an outer sleeve having connecting means for connection to a delivery outlet. It may be a stator remote from the connecting means which has its outer wall unconstrained along a portion of its length. There may be provided a plurality of stators which have their outer walls unconstrained against radial inward movement along portions of their lengths.
- The invention, according to another aspect, extends to a borehole pump installation, which includes
- a rising main in a borehole and extending from a low level upwardly to a level above the mouth of the borehole;
- a helical gear pump as described, having its outlet connected to the lower end of the rising main; and
- a shaft inside the rising main, and connected to and extending upwardly from the rotor to a level above the upper end of the rising main;
- the rising main having an outlet opening opening at a high level, and the shaft at a level above the outlet opening being adapted for connection to a source of rotary power so as, in use, to cause rotation and orbiting of the rotor within the stators, and to cause water to be pumped from the borehole for delivery out of the outlet opening.
- The source of rotary power may be provided by manually-operable means which includes an arm operatively connected to the shaft, the arm having a handle whereby the shaft may be rotated about its axis relative to the rising main. The manually-operable means may include a pedestal mounted over and connected to the upper end of the rising main, the upper end of the pedestal supporting a bearing for the arm and having a clutch device to permit rotation of the arm in one direction only, about the rotational axis of the rotor.
- The pedestal may have a water outlet below the level of the bearing, and a sealing gland below the bearing, but above the water outlet, the shaft being adapted to pass sealingly through the sealing gland. The water outlet may be in the form of a spout directed downwardly from the pedestal. An upwardly directed baffle may be provided at the inner end of the spout.
- The invention, according to yet another aspect, extends to manually-operable means which includes a pedestal having mounting means for mounting it over the mouth of a borehole, and over the upper end of the rising main of an installation as described, and which has an arm operatively connectable via the connecting means to the shaft of the said installation, the arm being rotatably supported at the upper end of the pedestal about an axis which in use is co-axial with the shaft of the said installation.
- The rotational support of the arm by the pedestal may be provided by a bearing, and the pedestal may have a sealing gland below the bearing to permit the shaft to pass sealingly therethrough.
- The arm may be provided with gripping means for co- operating with the connecting means, the gripping means including two bushes in a transverse bore intersected by a longitudinal bore to accommodate the shaft, and the two bushes in use being urged together by a bolt passing through them to grip the shaft where it intersects the transverse bore.
- Instead of manually-operable means, the source of rotary power may be provided by a windmill-operated rotary drive having its output operatively connected to the shaft.
- According to another aspect of the invention, in the pumping of a fluid by a helical gear pump, which includes at least two resilient outer members arranged in series around an inner member, the inner and outer members being adapted to rotate and orbit relative to each other about a longitudinal axis, there is provided the method of using the delivery pressure of the fluid to exert external pressure on at least one of the outer members to balance at least to some degree the internal fluid pressure directed outwardly against the inner surface of the said outer member during pumping.
- The outer members may be stators and the inner member may be a rotor, the rotor being adapted to rotate and orbit inside the stators.
- The invention will now be described by way of example with reference to the accompanying diagrammatic drawings.
- In the drawings,
- Figure 1 shows a part-axial section through a borehole pump installation in accordance with the invention;
- Figure 2 shows a part-axial section of a stator-rotor combination mounted according to the invention;
- Figure 3 shows a part-axial section through an alternative stator-rotor combination according to the invention;
- Figure 4 shows a part-axial section through the upper end of a borehole hand pump installation according to the invention; and
- Figure 5 shows a part-sectional plan at V-V in Figure 4.
- Referring to Figure 1 of the drawings, there is shown a borehole, generally indicated by
reference numeral 10. It has aborehole casing 12 within which a rising main 14 is centrally located bystabilizers 16 arranged at axially spaced intervals within thecasing 12. Ahelical gear pump 18, according to the invention, is mounted at the lower end of the rising main 14. A foot valve andstrainer 20 is provided below thepump 18. Thepump 18 has ashaft 22 located centrally within the rising main 14 bybobbin bearings 24. Rotary power is applied to theshaft 22 by means of manually-operable means in the form of ahand pump arm 26 of a hand pump head, generally indicated byreference numeral 27. Thehand pump arm 26 is rotatably mounted onpedestal 28 which is mounted by means of abase member 30 over theborehole 10. Thepedestal 28 has a delivery oroutlet pipe 32 which is provided with abaffle 34 on the inside of the pedestal so as to prevent the introduction of foreign matter into thepedestal 28 from outside, via theoutlet pipe 32. Thebase member 30 is mounted on aconcrete block 36 cast into thesoil 38 around the mouth of theborehole 10. - Referring to Figure 2 of the drawings, the
pump 18 comprises acylindrical casing 40 connected to the lower end of the rising main 14 (not shown). within thecasing 40, stators 42.1 and 42.2 are mounted sealingly in tandem around therotor 44. Thering 45 is arranged at the suction end of the stator 42.2. Therotor 44 is connected to the lower end of theshaft 22. - The stator 42.1 is moulded into casing 42.11 which is attached to the
casing 40. The stator 42.2 is moulded intoring 45 which is attached to the casing. Aclearance space 48 is provided around the upper end of the stator 42.2. - The
rotor 44 will be arranged to have conventional radial interference with the stator 42.1, and little radial interference with the stator 42.2. The stators 42.1 and 42.2 are also arranged in timed relationship with each other relative to therotor 44 and are held in position in thecasing 40. Under no load, the radial interference between therotor 44 and the inner surface of the stator 42.2 will be less than the radial interference between therotor 44 and the inner surface of the stator 42.1. - The
shaft 22 is sufficiently flexible to take up the eccentricity of the rotor orbiting within the stator. It is therefore not necessary to have flexible connectors, such as universal joints and so on, in line withshaft 22. Theshaft 22 is made up of a number of sections joined end-to-end. - In use, there will be such interference between the
rotor 44 and the inner surfaces of the stators 42.1 and 42.2 at start-up as can be tolerated. The interference provided by the stator 42.1 will be within a predetermined tolerance for start- up purposes, so that the starting torque will not be excessive. - Referring to Figure 3 of the drawings, the arrangement is similar to that shown in Figure 2. The upper stator 42.3 is also sealingly mounted in similar fashion to the stator 42.2 within the
casing 40.Rotor 44 and stator 42.2 of Figure 3 operate in the same way as described for the stator 42.2 and therotor 44 of Figure 2. The stators 42.2 and 42.3 of Figure 3 are also arranged in timed relationship relative to each other and relative to therotor 44, and are held in position in thecasing 40. - The delivery pressure at the outlet from the stator 42.3 will act on the outside of the stator in the
clearance space 48 and will balance to some degree the internal pressure inside the stator 42.3. Thus, sealing interference between the stator 42.3 and therotor 44 will be substantially maintained so that delivery can take place even under a high head. - Referring now to Figures 4 and 5 of the drawings, there are shown details of manually-operable means in the form of a
hand pump head 27, which includes thepedestal 28 rotatably supporting thearm 26 viaanti-friction bearing 60. Thearm 26 has aratchet device 62 to prevent it from being turned in the wrong direction. The teeth for theratchet device 62 andbearing 60 are mounted in aplug 64 which is located in the upper end of thepedestal 28. Theshaft 22 passes throughseals 66 which engage sealingly with theshaft 22 along its outer surface. Theshaft 22 is locked in relation to. thearm 26 by gripping means which includesbushes bolt 72 passing with clearance through them. The bushes have faces 68.1 and 70.1 urged into gripping relationship with theshaft 22 by means of thebolt 72. The bushes are located axially in a bore 74 which is intersected by theshaft 22. If desired, the ends of thebore 72 are closed off byplugs 76 and 78 to prevent tampering with the locking arrangement on theshaft 22. Thebolt 72 is provided with a socket head 72.1, further to discourage tampering if the cover 76 should be removed. In Figure 4 theplug 78 is shown removed. - In a preferred configuration of the helical gear pump, the stator has three starts and the rotor has two starts.
- The lower ends of the casing is conveniently threaded to engage with a foot valve or a foot valve and
strainer 20. - In use, the direction of rotation of the rotor is arranged to take place in such a direction that water will be pumped upwardly. The upper ends of the stators 42.2 will be subjected to partial delivery pressure. The upper ends of the stators 42.1 and 42.3 will, on the other hand, be subjected to full delivery pressure. This is the pressure which is applied to the
clearance spaces 48. During start-up, the interference between the rotor and the stators 42.2 and 42.3 can be minimal. As pressure builds up, however, a tendency for the stators to expand under internal pressure can be cancelled or counteracted or compensated for by the external pressure around the outside of the stators, in the clearance spaces mentioned. It is thus possible to start with minimal interference between the rotor and the stators, yet without the danger of losing necessary sealing interference, as pressure builds up inside the stators. - Because of the compensating effect which the delivery pressure has on the outer surfaces of the stators 42.2 and 42.3, they may for brevity be referred to as compensating stators.
- The hand pump embodiment shown in the drawings, shows the handle connected directly to the pump shaft without an intermediate gear ratio. It is possible to have the pump shaft driven via a step-down or step-up drive to drive it slower or faster than the handle. Such a drive may be provided by chain and sprockets, V-belts and pulleys, or a gear drive with toothed gearwheels. The pump shaft may also be driven by a rotary windmill-driven shaft directly or via a step-up or step- down drive.
- A pump according to the invention, having a compensating stator, also has advantages in pumping hot liquids or in pumping cold liquids which later become hot. In order to allow for temperature, the moulded-to metal stator 42.1 must have greater initial clearance at low temperature. This would result in poor performance in the cold condition, if used alone, because of excessive clearance. The addition of a compensating stator 42.2 ensures adequate performance in the cold condition. As temperature rises, so the stator 42.1 expands, thereby taking up the greater initial clearance and providing required interference and hence good sealing at the final operating temperature.
- The Applicants have found that helical gear pumps having stators arranged in series in accordance with the invention, have low starting torques in practice yet have adequate deliveries even at high heads and at low speeds, without excessive torque requirements. Thus, such pumps are very suitable for use as hand pumps on boreholes.
- The Applicants have found that in order to pump at high heads an increase in length of a compensating stator will lead to an unacceptably high load torque and low delivery rate. They have found that this drawback can be overcome by mounting an equivalent length of compensating stators in series around a rotor., Such a pump does not have an unacceptably high load torque, and yet has an adequate delivery rate.
- In other words, a pump having a series mounting of compensating stators has an increased efficiency over a pump having a single compensating stator of a length equivalent to the series-mounted compensating stators.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA825185 | 1982-07-20 | ||
ZA825185 | 1982-07-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0100627A1 true EP0100627A1 (en) | 1984-02-15 |
EP0100627B1 EP0100627B1 (en) | 1987-05-20 |
Family
ID=25576174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83304217A Expired EP0100627B1 (en) | 1982-07-20 | 1983-07-20 | Helical gear pump |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0100627B1 (en) |
JP (1) | JPS5974385A (en) |
AU (1) | AU554747B2 (en) |
BR (1) | BR8303901A (en) |
DE (1) | DE3371674D1 (en) |
ES (1) | ES524252A0 (en) |
GB (1) | GB2124305B (en) |
MW (1) | MW3283A1 (en) |
NZ (1) | NZ204931A (en) |
ZW (1) | ZW16083A1 (en) |
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FR2696792A1 (en) * | 1992-10-13 | 1994-04-15 | Inst Francais Du Petrole | Well pumping system, e.g. for oil well - allows lubricant injection from surface to pump rotor mounting |
WO2009040442A1 (en) * | 2007-09-28 | 2009-04-02 | Shell Internationale Research Maatschappij B.V. | Method for enhancing recovery of a hydrocarbon fluid |
US11759212B2 (en) | 2015-01-27 | 2023-09-19 | Michael Zhadkevich | Devices and techniques for vascular compression |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3345233C2 (en) * | 1983-12-14 | 1985-10-31 | Joh. Heinrich Bornemann GmbH & Co KG, 3063 Obernkirchen | Eccentric screw pump for pumping liquids from boreholes, in particular from petroleum boreholes |
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 |
US7214042B2 (en) * | 2004-09-23 | 2007-05-08 | Moyno, Inc. | Progressing cavity pump with dual material stator |
CN109763978A (en) * | 2019-03-12 | 2019-05-17 | 北京雷神博峰信息技术有限责任公司 | A kind of hand integrated pump of vehicle mounted electric |
CN114320884B (en) * | 2021-11-10 | 2024-06-14 | 浙江环誉泵业科技有限公司 | High-speed high-temperature high-efficiency fuel pump for aerospace |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US2408109A (en) * | 1945-03-13 | 1946-09-24 | Alden Speare S Sons Co | Pump |
US2621605A (en) * | 1945-10-12 | 1952-12-16 | Clayton Mark & Company | Pump |
US2826152A (en) * | 1955-08-30 | 1958-03-11 | Robbins & Myers | Helical gear pump with bellows stator |
US3347169A (en) * | 1966-09-26 | 1967-10-17 | Sargent Industries | Rotary well pump |
DE2418967A1 (en) * | 1974-04-19 | 1975-10-30 | Netzsch Mohnopumpen Gmbh | Eccentric worm pump has separate worm sections on common shaft - and additional inlet into chamber between different-output pump sections |
US3982858A (en) * | 1973-11-14 | 1976-09-28 | Smith International Corporation, Inc. | Segmented stator for progressive cavity transducer |
US3999901A (en) * | 1973-11-14 | 1976-12-28 | Smith International, Inc. | Progressive cavity transducer |
FR2385919A1 (en) * | 1977-03-30 | 1978-10-27 | Roth Peter | PUMP FOR THE EXTRACTION OF LIQUIDS FROM A CONTAINER |
FR2463299A1 (en) * | 1979-08-13 | 1981-02-20 | Michel Durand | Vertical pump for deep holes - where pump can be driven manually or by animal or windmill |
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GB446291A (en) * | 1933-10-30 | 1936-04-27 | Alfred Lanser | Improvements in rotary pumps |
GB1067014A (en) * | 1964-10-30 | 1967-04-26 | Unitex Ltd | Improvements in helical gear pumps |
DE1728143A1 (en) * | 1968-08-30 | 1972-03-30 | Max Streicher | Eccentric screw pump |
DE2817280A1 (en) * | 1978-04-20 | 1979-10-25 | Streicher Foerdertech | STATOR FOR ECCENTRIC SCREW PUMPS |
-
1983
- 1983-07-13 ZW ZW160/83A patent/ZW16083A1/en unknown
- 1983-07-18 NZ NZ204931A patent/NZ204931A/en unknown
- 1983-07-18 AU AU16927/83A patent/AU554747B2/en not_active Ceased
- 1983-07-19 ES ES524252A patent/ES524252A0/en active Granted
- 1983-07-20 MW MW32/83A patent/MW3283A1/en unknown
- 1983-07-20 EP EP83304217A patent/EP0100627B1/en not_active Expired
- 1983-07-20 BR BR8303901A patent/BR8303901A/en unknown
- 1983-07-20 DE DE8383304217T patent/DE3371674D1/en not_active Expired
- 1983-07-20 GB GB08319576A patent/GB2124305B/en not_active Expired
- 1983-07-20 JP JP58132661A patent/JPS5974385A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2408109A (en) * | 1945-03-13 | 1946-09-24 | Alden Speare S Sons Co | Pump |
US2621605A (en) * | 1945-10-12 | 1952-12-16 | Clayton Mark & Company | Pump |
US2826152A (en) * | 1955-08-30 | 1958-03-11 | Robbins & Myers | Helical gear pump with bellows stator |
US3347169A (en) * | 1966-09-26 | 1967-10-17 | Sargent Industries | Rotary well pump |
US3982858A (en) * | 1973-11-14 | 1976-09-28 | Smith International Corporation, Inc. | Segmented stator for progressive cavity transducer |
US3999901A (en) * | 1973-11-14 | 1976-12-28 | Smith International, Inc. | Progressive cavity transducer |
DE2418967A1 (en) * | 1974-04-19 | 1975-10-30 | Netzsch Mohnopumpen Gmbh | Eccentric worm pump has separate worm sections on common shaft - and additional inlet into chamber between different-output pump sections |
FR2385919A1 (en) * | 1977-03-30 | 1978-10-27 | Roth Peter | PUMP FOR THE EXTRACTION OF LIQUIDS FROM A CONTAINER |
FR2463299A1 (en) * | 1979-08-13 | 1981-02-20 | Michel Durand | Vertical pump for deep holes - where pump can be driven manually or by animal or windmill |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2696792A1 (en) * | 1992-10-13 | 1994-04-15 | Inst Francais Du Petrole | Well pumping system, e.g. for oil well - allows lubricant injection from surface to pump rotor mounting |
WO2009040442A1 (en) * | 2007-09-28 | 2009-04-02 | Shell Internationale Research Maatschappij B.V. | Method for enhancing recovery of a hydrocarbon fluid |
US11759212B2 (en) | 2015-01-27 | 2023-09-19 | Michael Zhadkevich | Devices and techniques for vascular compression |
Also Published As
Publication number | Publication date |
---|---|
EP0100627B1 (en) | 1987-05-20 |
GB8319576D0 (en) | 1983-08-24 |
ES8405901A1 (en) | 1984-06-16 |
MW3283A1 (en) | 1985-02-13 |
AU554747B2 (en) | 1986-09-04 |
JPS5974385A (en) | 1984-04-26 |
GB2124305B (en) | 1985-08-29 |
GB2124305A (en) | 1984-02-15 |
ZW16083A1 (en) | 1984-02-08 |
AU1692783A (en) | 1984-01-26 |
ES524252A0 (en) | 1984-06-16 |
DE3371674D1 (en) | 1987-06-25 |
NZ204931A (en) | 1986-06-11 |
BR8303901A (en) | 1984-02-28 |
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