WO2013057761A1 - Pompe à vis et rotor pour pompe à vis - Google Patents

Pompe à vis et rotor pour pompe à vis Download PDF

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Publication number
WO2013057761A1
WO2013057761A1 PCT/JP2011/005857 JP2011005857W WO2013057761A1 WO 2013057761 A1 WO2013057761 A1 WO 2013057761A1 JP 2011005857 W JP2011005857 W JP 2011005857W WO 2013057761 A1 WO2013057761 A1 WO 2013057761A1
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WO
WIPO (PCT)
Prior art keywords
tooth
rotor
lead portion
unequal
screw pump
Prior art date
Application number
PCT/JP2011/005857
Other languages
English (en)
Japanese (ja)
Inventor
大見　忠弘
健二 大山
肇 飯塚
Original Assignee
国立大学法人東北大学
株式会社飯塚鉄工所
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 国立大学法人東北大学, 株式会社飯塚鉄工所 filed Critical 国立大学法人東北大学
Priority to PCT/JP2011/005857 priority Critical patent/WO2013057761A1/fr
Publication of WO2013057761A1 publication Critical patent/WO2013057761A1/fr

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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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels

Definitions

  • the present invention relates to a screw pump.
  • Patent Document 1 a screw pump using a pair of screw-like rotors having an unequal lead portion and an equal lead portion has been proposed (for example, Patent Document 1). Further, such a rotor is complicated to process. Therefore, a machine tool that improves the productivity of the rotor has also been proposed (for example, Patent Document 2).
  • the peripheral speeds of a pair of rotors may be different from each other.
  • the dust may adhere to the tooth surface of the rotor.
  • the moving speeds of the tooth surfaces of one rotor and the tooth surfaces of the other rotor are different, so the dust removal efficiency can be improved.
  • the rotor diameters are made different (the rotation speed is the same), or a combination of these is possible. Can be mentioned.
  • the gaps between the tooth surfaces at the unequal lead portions between the pair of rotors become too large, or conversely there are almost no gaps. May end up. As a result, the target pump performance may not be obtained.
  • An object of the present invention is to provide a screw pump including a rotor having a tooth surface shape in which a more suitable gap can be formed.
  • the first rotor is a first unequal.
  • a screw pump including a rotor having a tooth surface shape in which a more suitable gap can be formed.
  • Sectional drawing of the screw pump which concerns on one Embodiment of this invention Sectional drawing of the said screw pump.
  • the flowchart which shows the manufacture procedure example of a rotor.
  • Explanatory drawing of a tooth trace curve Explanatory drawing of the creation method of a three-dimensional model.
  • FIG.1 and FIG.2 is sectional drawing of the screw pump 100 which concerns on one Embodiment of this invention, and is sectional drawing from which a cut surface differs mutually.
  • the screw pump 100 includes a housing 110 having a discharge port 111 and a suction port 112.
  • the housing 110 is provided with a pair of rotating shafts 101 and 101 extending in parallel with each other.
  • the rotary shafts 101 and 101 are rotatably supported by bearing portions 130 and 130, respectively.
  • a seal member 150 is provided between the housing 110 and the rotary shafts 101 and 101 in order to prevent leakage of fluid to be pumped and prevent dust and the like from entering the housing 110 from the outside. .
  • a gear (timing gear) 140 is fixed to one of the pair of rotating shafts 101 and 101, and a gear (timing gear) 141 is fixed to the other.
  • the gear 140 and the gear 141 mesh with each other.
  • the gear 141 is further engaged with a gear 142 that is rotated by a drive source (not shown) (for example, a motor).
  • the gear 142 is rotated by driving the drive source, and the rotational force is transmitted to the pair of rotating shafts 101 and 101 via the gears 140 and 141. As a result, the pair of rotating shafts 101 and 101 rotate.
  • the housing 110 accommodates screw-like rotors 120 and 121 that mesh with each other.
  • the rotor 120 is fixed coaxially to one rotating shaft 101.
  • the rotor 121 is coaxially fixed to the other rotating shaft 101.
  • the rotors 120 and 121 rotate integrally with the rotation shafts 101 and 101. As the rotors 120 and 121 rotate, the fluid to be pumped is pumped from the suction port 112 to the discharge port 101.
  • FIG. 3 shows the rotors 120 and 121 in mesh with each other.
  • the rotor 120 has a plurality of tooth grooves formed on the peripheral surface.
  • Each tooth gap includes a tooth bottom 1202, tooth surfaces 1203 and 1204, and an outer peripheral portion 1201 between adjacent tooth gaps.
  • the rotor 121 is formed with a plurality of teeth on the circumferential surface that mesh with the tooth grooves of the rotor 120.
  • Each tooth includes a tooth tip 1211, a tooth bottom 1212, and tooth surfaces 1213 and 1214.
  • the tooth surface 1204 located on the suction side is the upper tooth surface
  • the tooth surface 1203 located on the discharge side is the lower tooth surface
  • the tooth surface 1213 located on the suction side is the upper tooth surface
  • the tooth surface 1214 located on the discharge side is the lower tooth.
  • the rotor 120 is a female rotor with six tooth spaces, and the rotor 121 is a male rotor with five teeth.
  • the peripheral speeds of the rotors 120 and 121 can be made different from each other.
  • the moving speeds of the tooth surfaces 1203 and 1214 facing each other and the moving speeds of the tooth surfaces 1204 and 1213 facing each other can be made different.
  • the dust removal efficiency on the tooth surfaces 1203, 1204, 1213, and 1214 can be improved.
  • the rotor 120 has, on the suction side, an unequal lead portion 120A in which a tooth groove is formed with an unequal lead / unequal inclination angle, and an equal lead portion 120B in which a tooth groove is formed at an equal lead / equal inclination angle on the discharge side.
  • the rotor 121 meshes with the unequal lead portion 120A on the suction side, the teeth are formed with unequal leads and unequal inclination angles, and the unequal lead portion 121A meshes with the equal lead portion 120B on the discharge side, the teeth etc.
  • Each of the leads has an equal lead portion 121B formed at an equal inclination angle.
  • the unequal lead portions 120A and 121A are portions where the suction side has a larger lead angle (inclination angle) than the discharge side, and the lead angle gradually decreases from the suction side toward the discharge side. is there.
  • the equal lead portions 120A and 121A are portions having the same lead angle (inclination angle) from the suction side to the discharge side.
  • the rotors 120 and 121 are provided with both unequal lead portions and equal lead portions, but only the unequal lead portions may be provided.
  • the gap between the tooth surfaces 1203 and 1214 facing each other is different.
  • the gap or the gap between the tooth surface 1204 and the tooth surface 1213 facing each other is too large or too small. Therefore, a method for designing the gap to be appropriate will be described.
  • FIG. 4 is a flowchart showing an example of the manufacturing procedure of the rotor.
  • the overall flow is outlined.
  • S1 the specifications of the screw pump 100 are determined.
  • S2 the rotors 120 and 121 that satisfy the specifications of S1 are designed.
  • S3 a three-dimensional shape model of the rotors 120 and 121 is created according to the contents designed in S2. Creation of a three-dimensional shape model can be performed on a computer (hereinafter referred to as a CAD system) in which three-dimensional CAD software is installed.
  • a computer hereinafter referred to as a CAD system
  • the clearance between the tooth surfaces of the rotor 120 and the rotor 121 is evaluated based on the three-dimensional shape model of the rotors 120 and 121 created in S3. Specifically, with respect to the unequal lead portions 120A and 121A, the gap between the lower tooth surface 1203 of the rotor 120 and the lower tooth surface 1214 of the rotor 121, and the upper tooth surface 1204 of the rotor 120 and the upper tooth surface of the rotor 121 Evaluate whether or not the gap with 1213 is appropriate. The clearance is evaluated on the CAD system.
  • the three-dimensional shape models of the rotors 120 and 121 are virtually assembled and meshed with each other. And the tooth surface and tooth surface which evaluate a clearance gap are designated, and the distance between tooth surfaces is calculated by a CAD system. If the calculated distance is appropriate, the process proceeds to S5, and if it is inappropriate, the process proceeds to S10.
  • the gap between the tooth surfaces of the unequal lead portions 120A and 121A is preferably 300 to 500 microns, particularly 350 to 450 microns in the vicinity of the starting point on the suction side, and gradually decreases gradually as it advances to the discharge side.
  • the starting point of the equal lead is preferably about 200 microns.
  • Unequal lead 120A Rotor diameter: approx. 21 cm, number of tooth gaps: 6, inlet angle on the suction side of the unequal lead part: 45 degrees, outlet angle on the discharge side of the unequal lead part (slope angle of the equal lead part): 5 degrees Part 121A Rotor diameter: about 25 cm, number of teeth: 5, inlet angle on the suction side of the unequal lead portion: 35 degrees, outlet angle on the discharge side of the unequal lead portion (tilt angle of the equal lead portion): 3.5 degrees rotor ( 121) Rotation speed: 7200 rpm
  • the gap between the tooth surfaces of the unequal lead portions 120A and 121A does not necessarily have to be uniform in the rotor axial direction.
  • the gap on the suction side is preferably larger than the discharge side.
  • the suction-side gap is preferably 1.5 to 2.5 times, particularly 1.8 to 2.3 times the discharge-side gap.
  • the teeth may expand outward due to temperature rise or centrifugal force.
  • the tooth surfaces may interfere with each other due to tooth expansion.
  • machining programs for the rotors 120 and 121 are created from the three-dimensional shape model created in S3.
  • the machining program can be created on a computer in which CAM software is installed.
  • the machining program created in S5 is input to the CNC machine tool, and the rotors 120 and 121 are actually created.
  • the rotor design is changed and the process returns to S3, and the same processing is repeated.
  • the three-dimensional shape model of the rotors 120 and 121 can be created if the cross-sectional shape perpendicular to the axis of the rotor and the tooth trace are determined.
  • the cross-sectional shape perpendicular to the axis is a cross-sectional shape when the rotor is cut along a plane orthogonal to the axial direction.
  • the tooth trace curve defines the arc length from the reference position of the rotor and the position in the axial direction, and defines each surface of the tooth surface, the tooth tip, and the tooth bottom.
  • FIG. 5 shows an example of a tooth trace curve
  • FIG. 6 is an explanatory diagram of a method for creating a three-dimensional shape model.
  • the axial direction of the rotor is the Z direction
  • the end surface on the suction side of the rotor is the origin of coordinates.
  • the tooth trace curves L1 and L2 shown in FIG. 5 are defined for each rotor.
  • the tooth trace curve L 1 defines each tooth of the rotor 121
  • the tooth trace curve L 2 defines each tooth gap of the rotor 120.
  • the tooth trace curve is arcuate at the unequal lead portion and is straight at the equal lead portion.
  • R is the distance between a point selected from the contour line of the cross-sectional shape perpendicular to the axis and the rotor axis
  • ⁇ is the rotation angle of the rotor
  • Z is the rotor axis.
  • shape SC indicates a cross-sectional shape perpendicular to the axis of the rotor to be modeled at the origin. If the point P is taken on the contour of the shape SC and the distance from the point P to the axis of the shape SC is R, the tooth trace curve L1 shown in the figure shows the position of the point P in the Z direction with respect to the rotation angle of the rotor. It will be.
  • the axis-perpendicular shape SC ′ when the rotation angle is ⁇ a is obtained by rotating the shape SC about the axis by ⁇ a.
  • the coordinates in the Z direction of the shape SC ′ in the three-dimensional space are the tooth trace curves L1 to Za.
  • ⁇ Axis perpendicular cross-sectional shape and tooth trace curve design> In the process of S2 described above, the cross-sectional shape perpendicular to the axis and the tooth trace curve are mainly designed.
  • the tooth trace for example, the outer diameter of the rotor, the length of the unequal lead portion in the Z direction, the number of leads of the unequal lead portion (number of turns), the inlet angle of the unequal lead portion, the unequal lead portion The outlet angle (equal lead portion angle), the length of the equal lead portion in the Z direction, the number of leads (number of turns) of the equal lead portion, and the like are required.
  • Z is the position of the rotor in the axial direction
  • Z is the position of the rotor in the axial direction
  • Z is the position of the rotor in the axial direction
  • ⁇ ⁇
  • ⁇ a constant determined by the condition of the exit coordinates of the unequal lead
  • R is the radius
  • ⁇ is the rotation angle
  • ⁇ is the entrance angle
  • ⁇ 0 is the exit angle .
  • the screw pump can be designed by determining the cross-sectional shape perpendicular to the axis from the above formula 1, the root diameter of each rotor, the number of teeth of each rotor, the inter-axis distance between the rotors, and the like.
  • the design change must be made within a range that does not significantly impair the original specification (S1).
  • the design change may be made only on one of the two rotors or on both, but it is easier to make the change on only one of the two rotors.
  • S1 original specification
  • the design change may be made only on one of the two rotors or on both, but it is easier to make the change on only one of the two rotors.
  • FIG. 7 shows an example of each tooth trace curve of the upper tooth surface 1213 and the lower tooth face 1214 of the rotor 121 and a method of creating a three-dimensional shape model based on these tooth trace curves.
  • the two types of tooth traces after the change are derived from the pre-change tooth traces.
  • the tooth trace curves L11 and L12 in FIG. 7 are derived from the tooth trace curve L1 shown in FIG. 6, for example.
  • the tooth trace curves L11 and L12 first set a correction gap between the upper tooth surfaces and a correction gap between the lower tooth surfaces at the entrance (end portion on the suction side) of the unequal lead portion. Then, the term of R ⁇ ⁇ in the above equation 1 is modified so that these correction gaps are realized. At this time, these correction gaps may be gradually and gradually reduced from the inlet side (suction side) to the outlet side (discharge side) of the unequal lead portion.
  • R ⁇ ⁇ + C ⁇ f (R ⁇ ⁇ ) is substituted into the term of R ⁇ ⁇ in Equation 1 above.
  • f (R ⁇ ⁇ ) is a function that becomes zero at the end point of the unequal lead portion (start point of the equal lead portion). Then, the value of C is determined so that the correction gap is appropriate.
  • the deformation formula of the above formula 1 obtained in this way becomes the tooth trace after the change.
  • One of the tooth trace curves for the upper tooth surface and the lower tooth surface may be a tooth trace curve before the change. That is, one of the upper and lower tooth surface tooth trace curves may be a tooth trace curve L1, and the other may be a tooth trace curve changed from the tooth trace curve L1.
  • the shape SC indicates the cross-sectional shape perpendicular to the axis of the rotor at the origin. If the point P is taken on the contour of the shape SC and the distance from the point P to the axis of the shape SC is R, the tooth trace curves L11 and L12 shown in the figure are the positions of the point P in the Z direction with respect to the rotation angle of the rotor. Is the same as in the case of FIG.
  • FIG. 6 is different from the case of FIG. 6 in that a cross-sectional shape perpendicular to the axis is obtained for each of the tooth trace curves L11 and L12 according to the coordinates in the Z direction.
  • one axis-perpendicular cross-sectional shape is created by superimposing two axis-perpendicular cross-sectional shapes and taking the logical sum (OR logic) of these figures.
  • an axially perpendicular cross-sectional shape SC1 having a rotation angle ⁇ 1 is obtained from the tooth trace curve L12. Further, from the tooth trace curve L11, an axial perpendicular cross-sectional shape SC2 having a rotation angle ⁇ 2 is obtained. Then, the axis perpendicular cross-sectional shape SC ', which is a figure obtained by logically summing the axis perpendicular cross-sectional shape SC1 and the axis perpendicular cross-sectional shape SC2, is the axis perpendicular cross-sectional shape of the target rotor at the coordinate Zb.
  • one tooth surface TS1 is a tooth surface based on the tooth trace curve L11
  • the other tooth surface TS2 is a tooth surface based on the tooth trace curve L12.
  • the present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention.
  • the tooth trace curve may be changed not on the tooth surface of the male rotor (121) but on the tooth surface of the female rotor (120), or on the tooth surfaces of both male and female rotors. It may be. Therefore, in order to make the scope of the present invention public, the following claims are attached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

La présente invention concerne une pompe à vis équipée d'un premier rotor en forme de vis et d'un second rotor en forme de vis comprenant des entredents qui coopèrent avec les dents du premier rotor. Le premier rotor comprend une première partie à pas variable et le second rotor comprend une seconde partie à pas variable qui coopère avec la première partie à pas variable. Les deux surfaces de dent qui forment une dent de la première partie à pas variable et/ou les deux surfaces de dent qui forment un entredent de la seconde partie à pas variable sont formées en se basant sur les courbes des lignes de flanc différentes les unes des autres.
PCT/JP2011/005857 2011-10-19 2011-10-19 Pompe à vis et rotor pour pompe à vis WO2013057761A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/005857 WO2013057761A1 (fr) 2011-10-19 2011-10-19 Pompe à vis et rotor pour pompe à vis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/005857 WO2013057761A1 (fr) 2011-10-19 2011-10-19 Pompe à vis et rotor pour pompe à vis

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WO2013057761A1 true WO2013057761A1 (fr) 2013-04-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017075555A1 (fr) * 2015-10-30 2017-05-04 Gardner Denver, Inc. Rotors à vis complexes
CN113294334A (zh) * 2021-06-07 2021-08-24 无锡锡压压缩机有限公司 一种氦气螺杆压缩机转子

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004263629A (ja) * 2003-03-03 2004-09-24 Tadahiro Omi スクリュー真空ポンプ
WO2005124155A1 (fr) * 2004-06-18 2005-12-29 Tohoku University Pompe à vide à vis

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004263629A (ja) * 2003-03-03 2004-09-24 Tadahiro Omi スクリュー真空ポンプ
WO2005124155A1 (fr) * 2004-06-18 2005-12-29 Tohoku University Pompe à vide à vis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017075555A1 (fr) * 2015-10-30 2017-05-04 Gardner Denver, Inc. Rotors à vis complexes
US10975867B2 (en) 2015-10-30 2021-04-13 Gardner Denver, Inc. Complex screw rotors
US11644034B2 (en) 2015-10-30 2023-05-09 Gardner Denver, Inc. Complex screw rotors
CN113294334A (zh) * 2021-06-07 2021-08-24 无锡锡压压缩机有限公司 一种氦气螺杆压缩机转子

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