US20160341197A1 - Uniaxial eccentric screw pump - Google Patents

Uniaxial eccentric screw pump Download PDF

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Publication number
US20160341197A1
US20160341197A1 US15/114,807 US201415114807A US2016341197A1 US 20160341197 A1 US20160341197 A1 US 20160341197A1 US 201415114807 A US201415114807 A US 201415114807A US 2016341197 A1 US2016341197 A1 US 2016341197A1
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United States
Prior art keywords
stator
screw pump
casing
eccentric screw
uniaxial eccentric
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Abandoned
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US15/114,807
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English (en)
Inventor
Kei Tanaka
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Heishin Ltd
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Heishin Ltd
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Assigned to HEISHIN LTD. reassignment HEISHIN LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANAKA, KEI
Publication of US20160341197A1 publication Critical patent/US20160341197A1/en
Abandoned legal-status Critical Current

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    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/005—Removing contaminants, deposits or scale from the pump; Cleaning
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • 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
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0065—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
    • 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
    • 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
    • F04C2/1073—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 is stationary while the other member rotates and orbits
    • F04C2/1075—Construction of the stationary member
    • 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
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/805—Fastening means, e.g. bolts

Definitions

  • the present disclosure relates to a uniaxial eccentric screw pump.
  • a uniaxial eccentric screw pump having the configuration where a stator is formed of an outer sleeve and a stator body, and the stator is held between a casing and an end stud using stay bolts (see Japanese Unexamined Patent Application Publication No. 2011-256748, for example).
  • the configuration may be considered where a larger gap is formed between an inner surface of a stator and an outer surface of a rotor so as to enable the rotation of the rotor even during a high-temperature cleaning operation.
  • a discharge pressure during a normal operation is decreased and hence, a desired discharge amount cannot be acquired.
  • a uniaxial eccentric screw pump which includes:
  • stator having one end portion thereof connected to the casing and having an inner peripheral surface thereof formed into a female threaded shape
  • a rotor configured to be insertable into the stator and formed of a shaft body having a male threaded shape
  • the stator is formed of: a stator body; and an outer sleeve detachably disposed on an outer peripheral portion of the stator body, and
  • a closure structure which at least prevents intrusion of a foreign material from the outside is provided at a junction between the stator body and the casing and at a junction between the stator body and the end stud.
  • the outer sleeve can be removed from the stator body. Accordingly, even when a fluid of a high temperature is made to flow through the stator, the stator is expandable in the outer diameter direction and hence, it is possible to prevent the stator from being brought into pressure contact with the rotor due to the expansion of the stator toward the inner diameter side. Accordingly, also during a high-temperature cleaning, there is no possibility that a contact pressure between the rotor and the stator is increased so that interference becomes large more than necessary.
  • the intrusion of various germs or the like from the outside can be prevented by the closure structure and hence, an operation of the uniaxial eccentric screw pump can be changed over between a cleaning operation and a normal operation while an environment after cleaning is maintained.
  • closure structure be a seal structure which prevents leakage of a fluid material toward the outside from both end portions of the stator.
  • stator body be made of rubber or a resin material
  • outer sleeve be made of a metal material
  • the closure structure include: flange portions formed on connection portions of the end stud and the stator; a first clamp configured to hold both flange portions in a state where both flange portions are brought into contact with each other; flange portions formed on connection portions of the casing and the stator; and a second clamp configured to hold both flange portions in a state where both flange portions are brought into contact with each other.
  • an adaptor made of a metal material be mounted on both end portions of the stator, and each adaptor form the flange portion.
  • the flange portion can be easily formed on the stator having the complicated inner surface structure. Further, when it is necessary to exchange the stator due to wear, the adaptor can be reused by removing from the stator.
  • the uniaxial eccentric screw pump further include:
  • a spacer which is mounted on the stay bolt from the outside, is brought into contact with the casing and the end stud respectively, and maintains the casing and the end stud with a fixed distance therebetween.
  • the distance between the casing and the end stud can be maintained at a fixed value by the spacer and hence, the stator body can be held at a desired compression state.
  • the outer sleeve be formed of a plurality of covers formed by splitting the outer sleeve in a circumferential direction, and the uniaxial eccentric screw pump include an adjusting unit configured to adjust a gap between the covers.
  • the uniaxial eccentric screw pump include:
  • a detection unit configured to detect a degree of expansion of the stator body toward the outer diameter side
  • control unit configured to automatically adjust the gap between the covers by performing a drive control of the adjusting unit based on a detection value from the detection unit.
  • the gap between the covers can be automatically adjusted corresponding to the degree of expansion of the stator body in an outer diameter direction and hence, it is unnecessary for an operator to perform an adjusting operation by determining whether the operation is a normal operation or a cleaning/sterilization operation.
  • the outer sleeve in the case where the inside of the stator body is cleaned and sterilized by a heated fluid, the outer sleeve can be removed from the stator body and hence, even when the stator body is thermally expanded, the stator body can be deformed toward the outer diameter side whereby the rotation of the rotor is not obstructed. Accordingly, both during a normal operation and during a cleaning/sterilization operation, there is no possibility that the rotor is brought into pressure contact with the stator body and abnormal wear is generated. Further, the uniaxial eccentric screw pump includes the closure structure and hence, it is unnecessary to disassemble the stator body whereby an operation of the uniaxial eccentric screw pump can be changed over to a normal operation from a cleaning operation while an environment after cleaning is maintained.
  • FIG. 1( a ) is a schematic plan view of a uniaxial eccentric screw pump according to an embodiment
  • FIG. 1( b ) is a cross-sectional view taken along a line A-A in FIG. 1( a ) .
  • FIG. 2 is a schematic front view of the uniaxial eccentric screw pump shown in FIG. 1 .
  • FIG. 3 is an enlarged cross-sectional view showing a state where a casing and a stator shown in FIG. 1( b ) are in a disassembled state.
  • FIG. 4 is an enlarged cross-sectional view showing a state where the casing and the stator are connected to each other from the state shown in FIG. 3 .
  • FIG. 5 is an enlarged cross-sectional view showing a state where the casing and the stator are fastened to each other by stay bolts from the state shown in FIG. 4 .
  • FIG. 6 is a partially-enlarged view showing a state where the stator and an end stud shown in FIG. 1( b ) are in a disassembled state.
  • FIG. 7 is an enlarged cross-sectional view showing a state where the stator and the end stud are connected to each other from the state shown in FIG. 6 .
  • FIG. 8 is an enlarged cross-sectional view showing a state where the stator and the end stud are fastened to each other by stay bolts from the state shown in FIG. 7 .
  • FIG. 9 is a schematic front view showing a clamp shown in FIG. 1 .
  • FIG. 10( a ) is a side view showing one end portion of a stator body according to another embodiment
  • FIG. 10( b ) is a cross-sectional front view showing a portion of one end portion of the stator body.
  • FIG. 11( a ) is a schematic front view of a uniaxial eccentric screw pump according to another embodiment
  • FIG. 11 (b) is a side view showing a first support frame
  • FIG. 11( c ) is a side view showing a second support frame.
  • FIG. 12 is a schematic front view of a uniaxial eccentric screw pump according to another embodiment.
  • FIG. 13 is a schematic explanatory view showing a support structure of an outer sleeve according to another embodiment.
  • FIG. 14 is a schematic explanatory view showing a support structure of an outer sleeve according to another embodiment.
  • FIG. 15 is a schematic explanatory view showing an outer sleeve according to another embodiment.
  • FIG. 1 shows a uniaxial eccentric screw pump according to this embodiment.
  • the uniaxial eccentric screw pump includes: a drive unit (not shown) disposed on one end side of a casing 1 ; a stator 2 disposed on the other end side of the casing 1 ; a rotor 3 ; and an end stud 4 .
  • the casing 1 is a cylindrical body made of a metal material, and a coupling rod 5 is housed in the casing 1 .
  • One end portion of the coupling rod 5 is connected to a coupling 6 , and power from the drive unit is transmitted to the coupling rod 5 .
  • a connecting pipe 7 is connected to an outer peripheral surface of the casing 1 on one end side, and a fluid material (for example, a food or the like having high viscosity such as margarine, soybean paste) can be supplied to the casing 1 from a tank or the like not shown in the drawing.
  • a flange portion 8 extending toward the outer diameter side is formed on an opening portion on the other end of the casing 1 .
  • the stator 2 is formed of: an outer sleeve 9 ; and a stator body 10 disposed in a state where the stator body 10 is brought into close contact with an inner surface of the outer sleeve 9 .
  • the outer sleeve 9 is formed of an upper cover 27 and a lower cover 28 both of which are made of a metal material (for example, stainless steel or the like).
  • the cover 27 is formed of a semicircular cylindrical portion 27 a and extending portions 27 b extending toward the outside from both side edge portions of the semicircular cylindrical portion 27 a
  • the cover 28 is formed of a semicircular cylindrical portion 28 a and extending portions 28 b extending toward the outside from both side edge portions of the semicircular cylindrical portion 28 a.
  • the outer sleeve 9 is formed such that the upper cover 27 and the lower cover 28 are fastened to each other by bolts 38 a and nuts 38 b by making use of through holes formed in the extending portions 27 b, 28 b in a state where the semicircular cylindrical portions 27 a, 28 a are disposed on upper and lower portions of an outer periphery of the stator 2 and the extending portions 27 b, 28 b opposedly face each other.
  • the extending portions 27 b, 28 b are brought into contact with each other, and the semicircular cylindrical portions 27 a, 28 a are brought into close contact with an outer peripheral surface of the stator 2 .
  • a discharge pressure at the time of conveying the fluid material can be set to a desired value.
  • the stator body 10 is formed of a cylindrical body (for example, circular cylindrical body) made of an elastic material such as rubber or a resin which is selected as desired corresponding to a material to be conveyed (for example, silicon rubber, or a fluoro-rubber when the stator body 10 is used for cosmetics or the like containing silicon oil).
  • An inner peripheral surface of a center hole of the stator 2 is formed into a single-stage or multi-stage female threaded shape of n-thread.
  • ring portions 11 a, 1 lb having a slightly large outer diameter size respectively are formed, and adaptors 12 a, 12 b are respectively mounted on the stator body 10 by making use of these ring portions 11 a, 11 b.
  • the adaptors 12 a, 12 b are made of a metal material such as stainless steel. As shown in FIG. 1 , each adaptor 12 a, 12 b is formed of a cylindrical portion 13 a, 13 b and a flange portion 14 a, 14 b which projects toward the outer diameter side from one end of the cylindrical portion 13 a, 13 b. On each flange portion 14 a, 14 b, the first annular recessed portion 14 a 1 , 14 b 1 and the second annular recessed portion 14 a 2 , 14 b 2 which has an inner diameter size smaller than that of the first annular recessed portion 14 a 1 , 14 b 1 are formed in this order from an end surface of the flange portion 14 a, 14 b. Since the stator body 10 is made of an elastic material, the adaptors 12 a, 12 b is mounted on the stator body 10 by elastically deforming the ring portions 11 a , 11 b toward the inner diameter side.
  • the adaptor 12 a is held by a first clamp 15 in a state where the flange portion 14 a is brought into contact with a flange portion 18 of the end stud 4 described later.
  • the first clamp 15 is formed of a pair of semicircular clamp portions 15 b, 15 c which is rotatably connected to a pivotally supporting portion 15 a.
  • the first clamp 15 further includes a clip portion 15 d which fixes both clamp portions 15 b, 15 c so as to form an annular shape.
  • Both clamp portions 15 b, 15 c hold the flange portion 14 a of the adaptor 12 a and the flange portion 18 of the end stud 4 by an annular groove (not shown) formed on inner peripheral surfaces of the clamp portions 15 b, 15 c in an annular shape.
  • the adaptor 12 b is held by a second clamp 16 having substantially the same configuration as the first clamp 15 in a state where the flange portion 14 b of the adaptor 12 b is brought into contact with the flange portion 8 of the casing 1 .
  • Both the first clamp 15 and the second clamp 16 are made of substantially the same metal material (in this embodiment, stainless steel) as the adaptors 12 a, 12 b. That is, the adaptors 12 a, 12 b and the first and second clamps 15 , 16 which are made of substantially the same hard material can be brought into direct contact with each other. Accordingly, unlike the case where the stator body made of a resin, a rubber material or the like and the first clamp 15 or the second clamp 16 made of a metal material are brought into direct contact with each other, in this embodiment, there is no deformed portion and hence, a state where the adaptors 12 a, 12 b are held by the first and second clamps 15 , 16 , respectively, can be held in a stable manner.
  • the adaptors 12 a, 12 b are held by the first and second clamps 15 , 16 , respectively, can be held in a stable manner.
  • a pressure contact state of the stator body 10 which is made of soft rubber or a resin material with the flange portions 14 a, 14 b of the adaptors 12 a , 12 b, the flange portion 8 of the casing 1 and the flange portion 18 of the end stud 4 all of which are made of a hard metal material can be brought into a desired state.
  • air-tightness of the respective junctions can be maintained and hence, both during a normal operation and during a cleaning operation, it is possible to prevent leakage of a liquid and intrusion of various germs brought about by the exposure of the junctions to ambient atmosphere.
  • a metal-made ring 39 may be incorporated in the ring portions 11 a, 11 b formed on both end portions of the stator body 10 respectively (only a ring portion 11 a side shown in FIG. 10 ). With such a configuration, a clamping state acquired by the clamps 15 , 16 can be further strengthened thus further enhancing air-tightness of the junctions. Further, in addition to the configuration where the metal-made ring 39 and the metal-made adaptors 12 a, 12 b are used in combination, by imparting a function of the adaptor 12 a or 12 b to the ring 39 , at least either one of the adaptors 12 a or 12 b can be omitted.
  • the rotor 3 is formed by forming a shaft body made of a metal material into a single-stage or multi-stage male threaded shape of n- 1 thread.
  • the rotor 3 is disposed in the inside of the center hole of the stator 2 , and a conveyance space 17 continuously connected in a longitudinal direction of the center hole is formed.
  • One end portion of the rotor 3 is connected to the coupling rod 5 on a casing side.
  • the rotor 3 rotates in the stator 2 and, at the same time, revolves along the inner peripheral surface of the stator 2 by a drive force from the drive unit (not shown). That is, the rotor 3 eccentrically rotates in the center hole of the stator 2 and hence, the rotor 3 can convey a material in the conveyance space 17 in a longitudinal direction.
  • the flange portion 8 of the casing 1 and the flange portion 18 of the end stud 4 are respectively brought into contact with end surfaces of the respective adaptors 12 a, 12 b.
  • the ring portions 11 a , 11 b are positioned in the annular recessed portion 8 b of the flange portion 8 and the annular recessed portion 18 b of the flange portion 18 respectively.
  • the annular projecting portion 8 a of the flange portion 8 and the annular projecting portion 18 a of the flange portion 18 are positioned in the first annular recessed portions 14 a 1 , 14 b 1 of the flange portions 14 a, 14 b, respectively.
  • the ring portions 11 a , 11 b are press-fitted into the annular recessed portions 8 b, 18 b of the respective flange portions 8 , 18 so that the ring portions 11 a , 11 b are elastically deformed, and portions of the elastic deformation brings about the displacement of the stator body 10 in the axial direction.
  • the outer sleeve 9 is separated from the adaptors 12 a, 12 b.
  • the first clamp 15 is mounted on the adaptor 12 a and the flange portion 18
  • the second clamp 16 is mounted on the adaptor 12 b and the flange portion 8 respectively so as to strengthen the connection between the stator body 10 and the end stud 4 and the casing 1 .
  • the nuts 22 are fastened to the stay bolt 19 so as to clamp the outer sleeve 9 between the casing 1 and the end stud 4 by way of the support members 20 .
  • the stator body 10 is compressed in the axial direction. Therefore, the end surface of the ring portion 11 a is brought into pressure contact with an inner end surface of the annular recessed portion 18 b of the end stud 4 .
  • the end surface of the ring portion 11 b is brought into pressure contact with an inner end surface of the annular recessed portion 8 b formed on the flange portion 8 of the casing 1 . Accordingly, desired gas-tightness can be ensured at the junctions and hence, both during a normal operation and during a cleaning operation, it is possible to prevent leakage of a liquid and intrusion of various germs brought about by the exposure of the junctions to ambient atmosphere.
  • the end stud 4 is formed of a cylindrical body made of a metal material.
  • the flange portion 18 which extends outward is formed on an opening portion of the end stud 4 at one end of the end stud 4 .
  • the flange portion 18 is held by the first clamp 15 in a state where the flange portion 18 is brought into contact with the flange portion 14 a of the adaptor 12 a as described previously.
  • the end stud 4 and the casing 1 are connected to each other by stay bolts 19 . That is, support members 20 are formed on an outer peripheral surface of the end stud 4 and on an outer peripheral surface of the casing 1 respectively in a state where the support members 20 are disposed at two positions in point symmetry with respect to an axis.
  • the stay bolts 19 are made to pass through the support members 20 of the end stud 4 and the casing 1 respectively in a state where a cylindrical spacer 21 made of a metal material (for example, stainless steel) is mounted on each stay bolt 19 from outside, and a nut 22 is threadedly engaged with one end portion of each stay bolt 19 .
  • each spacer 21 is brought into contact with the support member 20 of the end stud 4 and the support member 20 of the casing 1 . Accordingly, the further fastening of the nuts 22 is not possible and hence, the distance between the end stud 4 and the casing 1 is maintained at a fixed value.
  • the drive unit not shown in the drawing is driven so as to rotate the rotor 3 by way of the coupling 6 and the coupling rod 5 . Therefore, the conveyance space 17 formed by an inner peripheral surface of the stator 2 and an outer peripheral surface of the rotor 3 moves in a longitudinal direction of the stator 2 and the rotor 3 . Accordingly, the fluid material discharged from the tank is sucked into the conveyance space 17 , and is conveyed to the end stud 4 . After the fluid material reaches the end stud 4 , the fluid material is further conveyed to another place.
  • the outer sleeve 9 is removed from an outer periphery of the stator 2 . Then, water vapor or pressurized hot water (heated fluid) is supplied to the uniaxial eccentric screw pump, and the rotor 3 is rotated by driving the drive unit. Although the stator 2 expands due to heat at this stage of operation, the outer sleeve 9 is removed and hence, the stator 2 can expand toward the outer diameter side whereby the expansion of the stator 2 toward an inner surface side can be suppressed. Accordingly, the rotation of the rotor 3 is not obstructed. By moving the conveyance space 17 by rotating the rotor 3 , the heated fluid is made to flow smoothly thus cleaning and sterilizing the inner surface of the stator 2 .
  • the uniaxial eccentric screw pump is cooled with a lapse of time.
  • the outer sleeve 9 is mounted on an outer peripheral portion of the stator body 10 and the conveyance of a fluid material to be transferred originally can be started again.
  • the outer sleeve 9 is configured to be removed at the time of supplying a heated fluid to the uniaxial eccentric screw pump.
  • This configuration allows the expansion of the stator body 10 toward the outer diameter side by the heated fluid. Accordingly, there is no possibility that the stator body 10 expands toward the inner diameter side and obstructs the rotation of the rotor 3 and hence, the inside of the stator 2 can be cleaned and sterilized by supplying the heated fluid to the inside of the stator 2 .
  • both end portions of the stator body 10 always maintain a state where these end portions are connected to the end stud 4 and the casing 1 in an air-tight state and hence, there is no possibility that various germs or the like in ambient atmosphere intrude into the inner space of the stator 2 whereby the stator 2 can maintain a clean environment after sterilization.
  • the stator body 10 can thermally expand toward the outer diameter side of the stator body 10 and hence, it is unnecessary to increase a gap between an inner surface of the stator and an outer surface of the rotor by taking into account of the thermal expansion of the stator body 10 toward the inner diameter side. Accordingly, in a normal operation state where the stator body 10 does not thermally expand, it is possible to set a contact pressure between the inner surface of the stator body 10 and the outer surface of the rotor 3 and interference (overlapping between the inner surface of the stator body 10 and the outer surface of the rotor 3 ) to appropriate values. Accordingly, it is possible to efficiently perform the conveyance of a fluid material during a normal operation such that a discharge pressure takes a desired value.
  • the uniaxial eccentric screw pump is disposed in a lateral direction (horizontal direction).
  • a fluid material may be conveyed downward.
  • the support structure for the uniaxial eccentric screw pump particularly, the support structure for the stator 2 is not particularly mentioned, the following configuration can be adopted.
  • first support frames 23 fixed to a base respectively.
  • the first support frame 23 is formed of a bottom surface portion 23 a, and both side surface portions 23 b, 23 c. A center portion of the bottom surface portion is fixed to the base by a bolt, and bolts are threadedly engaged with the end stud 4 and the casing 1 by way of both side surface portions.
  • the stator 2 is supported by second support frames 24 fixed to the base.
  • the second support frame 24 is formed of both side surface portions 24 a, 24 b and an upper surface portion 24 c which connects upper end portions of both side surface portions 24 a, 24 b to each other.
  • both side surface portions 24 a , 24 b are bent in horizontal direction and are fixed to the base by bolts. Further, a projecting portion 25 which is brought into contact with the outer sleeve 9 is integrally formed with an inner surface of one side surface portion.
  • a wing screw 26 is threadedly engaged with the other side surface portion from an outer surface side, and a distal end portion of the wing screw 26 is brought into contact with the outer sleeve 9 .
  • an upper cover 27 and a lower cover 28 which form the outer sleeve 9 may be held by clamping members 29 .
  • the clamping members 29 includes an upper plate 30 and a lower plate 31 which are configured to clamp extending portions 27 b of the upper cover 27 and extending portions 28 b of the lower cover 28 in a state where the extending portions 27 b , 28 b vertically overlap with each other.
  • a mounting plate 33 is integrally formed with the lower plates 31 by way of connecting rods 32 . The mounting plate 33 is fixed to the base by bolts.
  • Bolts 38 a are made to pass through the upper plates 30 and the lower plates 31 of the clamping members 29 in a state where the upper plates 30 and the lower plates 31 clamp the extending portions 27 b of the upper cover 27 and the extending portions 28 b of the lower cover 28 of the outer sleeve 9 therebetween, and nuts 38 b are threadedly engaged with the bolts 38 a.
  • nuts 38 b By fastening the nuts 38 b, the upper cover 27 and the lower cover 28 of the outer sleeve 9 can be firmly fixed to each other.
  • the support structure of the outer sleeve may be configured such that lower surfaces of the extending portions 28 b of the lower cover 28 are supported by support bases 34 , and a pressing portion 35 is pressed to upper surfaces of the extending portion 27 b of the upper cover 27 .
  • the pressing portion 35 is configured to be elevated and lowered by a hydraulic cylinder 36 .
  • a drive unit for elevating and lowering the pressing portion 35 is not limited to the hydraulic cylinder 36 , and various drive units such as a pneumatic cylinder, a solenoid and a motor can be adopted.
  • the upper cover 27 may be pressed to the lower cover 28 by displacing a gate-like guide member 37 which is driven by a hydraulic cylinder or the like not shown in the drawing downward.
  • a distance between the upper cover 27 and the lower cover 28 may be adjusted. That is, threaded holes may be formed in the extending portions 27 b of the upper cover 27 and the extending portions 28 b of the lower cover 28 respectively, and double-end bolts which have threads formed in the opposite directions on both end sides may be threadedly engaged with the respective threaded holes. With such a configuration, the upper cover 27 and the lower cover 28 can be made to approach each other or to be separated from each other by rotating the double-end bolts.
  • the double-end bolts may be rotated by a drive unit such as a motor not shown in the drawings.
  • a drive unit such as a motor not shown in the drawings.
  • This operation may be automatically performed, for example, based on a detection signal from a detector such as a temperature sensor which detects a temperature of the stator body 10 or a pressure sensor which detects a degree of expansion of the stator body 10 .
  • a control device may perform a control such that a detection signal is fetched from the detector, and the distance between the upper cover 27 and the lower cover 28 is changed in a stepwise manner based on whether or not the detected value exceeds a predetermined value or the like.
  • the distance between the upper cover 27 and the lower cover 28 can be automatically adjusted so as to prevent the stop of the rotation of the rotor 3 which may be caused by the expansion of the stator body 10 at the time of cleaning and sterilizing the uniaxial eccentric screw pump.
  • the outer sleeve 9 is not limited to the two-split structure consisting of the upper cover 27 and the lower cover 28 .
  • the outer sleeve 9 is formed of a plurality of covers formed by splitting the outer sleeve 9 in a circumferential direction, the number of splitting is not particularly limited.
  • FIG. 15( a ) shows the outer sleeve 9 which is split in three in the circumferential direction
  • FIG. 15( b ) shows the outer sleeve 9 which is split in four in the circumferential direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US15/114,807 2014-01-28 2014-12-04 Uniaxial eccentric screw pump Abandoned US20160341197A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014013544A JP6349566B2 (ja) 2014-01-28 2014-01-28 一軸偏心ネジポンプ
JP2014-013544 2014-01-28
PCT/JP2014/082143 WO2015114946A1 (ja) 2014-01-28 2014-12-04 一軸偏心ネジポンプ

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US20160341197A1 true US20160341197A1 (en) 2016-11-24

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ID=53756540

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/114,807 Abandoned US20160341197A1 (en) 2014-01-28 2014-12-04 Uniaxial eccentric screw pump

Country Status (8)

Country Link
US (1) US20160341197A1 (de)
JP (1) JP6349566B2 (de)
KR (1) KR101850232B1 (de)
CN (1) CN105934586B (de)
DE (1) DE112014006277T5 (de)
MY (1) MY188540A (de)
TW (1) TWI655368B (de)
WO (1) WO2015114946A1 (de)

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Publication number Priority date Publication date Assignee Title
US20160040480A1 (en) * 2014-08-11 2016-02-11 Ryan Directional Services, Inc. Variable Diameter Stator and Rotor for Progressing Cavity Motor
US20220299025A1 (en) * 2019-08-29 2022-09-22 Heishin Ltd. Uniaxial eccentric screw pump

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Publication number Priority date Publication date Assignee Title
JP6245717B1 (ja) * 2017-03-20 2017-12-13 兵神装備株式会社 ステータ及び一軸偏心ねじポンプ
CN109538112B (zh) * 2019-01-04 2023-09-08 中国地质大学（北京） 一种套装拼接式全金属螺杆定子加工方法

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US20110033279A1 (en) * 2007-08-20 2011-02-10 Heishin Sobi Kabushiki Kaisha Rotor drive mechanism and pump apparatus
US20130108412A1 (en) * 2010-06-07 2013-05-02 Takashi Hashima Uniaxial eccentric screw pump
US20160341196A1 (en) * 2014-01-28 2016-11-24 Heishin Ltd. Uniaxial eccentric screw pump

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US2866077A (en) * 1954-07-19 1958-12-23 Morton Henry Earl Combined welding and seam trimming machine
US4651897A (en) * 1984-10-22 1987-03-24 Sashco, Inc. Portable progressive cavity pump
US5080575A (en) * 1991-05-17 1992-01-14 Eastman Kodak Company Adjustable valve stem apparatus for valve gated injection molding devices
US20100196182A1 (en) * 2007-08-17 2010-08-05 Denise Loeker Eccentric screw pump with split stator
US20110033279A1 (en) * 2007-08-20 2011-02-10 Heishin Sobi Kabushiki Kaisha Rotor drive mechanism and pump apparatus
US20130108412A1 (en) * 2010-06-07 2013-05-02 Takashi Hashima Uniaxial eccentric screw pump
US20160341196A1 (en) * 2014-01-28 2016-11-24 Heishin Ltd. Uniaxial eccentric screw pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160040480A1 (en) * 2014-08-11 2016-02-11 Ryan Directional Services, Inc. Variable Diameter Stator and Rotor for Progressing Cavity Motor
US9869126B2 (en) * 2014-08-11 2018-01-16 Nabors Drilling Technologies Usa, Inc. Variable diameter stator and rotor for progressing cavity motor
US20220299025A1 (en) * 2019-08-29 2022-09-22 Heishin Ltd. Uniaxial eccentric screw pump
US11867172B2 (en) * 2019-08-29 2024-01-09 Heishin Ltd. Uniaxial eccentric screw pump

Also Published As

Publication number Publication date
DE112014006277T5 (de) 2016-11-17
CN105934586B (zh) 2018-01-09
TW201537033A (zh) 2015-10-01
KR20160114651A (ko) 2016-10-05
TWI655368B (zh) 2019-04-01
JP6349566B2 (ja) 2018-07-04
WO2015114946A1 (ja) 2015-08-06
KR101850232B1 (ko) 2018-04-18
JP2015140719A (ja) 2015-08-03
MY188540A (en) 2021-12-20
CN105934586A (zh) 2016-09-07

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