CN110242561A - A kind of the big flow screw rotor and its design method of Quimby pump - Google Patents

A kind of the big flow screw rotor and its design method of Quimby pump Download PDF

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Publication number
CN110242561A
CN110242561A CN201910670831.2A CN201910670831A CN110242561A CN 110242561 A CN110242561 A CN 110242561A CN 201910670831 A CN201910670831 A CN 201910670831A CN 110242561 A CN110242561 A CN 110242561A
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China
Prior art keywords
arc
screw
line
molded line
screw rotor
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Pending
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CN201910670831.2A
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Chinese (zh)
Inventor
王君
赵胜
李祥艳
奚周瑾
李雪琴
李宏鑫
陈少华
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China University of Petroleum UPC East China
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China University of Petroleum UPC East China
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Priority to CN201910670831.2A priority Critical patent/CN110242561A/en
Publication of CN110242561A publication Critical patent/CN110242561A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14Rotary-piston machines or pumps 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
    • F04C2/16Rotary-piston machines or pumps 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
    • G06F17/5086
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00Components
    • F04C2240/20Rotors

Abstract

The invention discloses the big flow screw rotors and its design method of a kind of Quimby pump, the left side molded line (101) of its left screw rotor (1) is made of 4 sections of curves and 1 point: 1 section of curtate epicycloid equidistant curve, 1 section of variable speed screw line, 2 sections of circular arcs, and acute angle cusp is not present in molded line;The right side molded line (201) of right screw rotor (2) is made of 10 sections of curves: 2 sections of prolate epicycloids, 2 sections of speed change helical envelopes, 6 sections of circular arcs, in the incorgruous dual AC power movement that left screw rotor (1) and right screw rotor (2) transmission ratio are 2 to 1, left side molded line (101) and right side molded line (201) can correct engagements.The big flow screw rotor proposed improves 15%~25% compared with classic screw rotor, in identical chassis size down-off, meets the flow demand under miniaturization manufacture, and structure is more compact, and sealing and stress performance are good.

Description

A kind of the big flow screw rotor and its design method of Quimby pump
Technical field
The present invention relates to Quimby pumps, in particular to are suitable for a kind of big flow screw rotor of Quimby pump.
Background technique
Quimby pump is a kind of proof positive displacement liquid pump, is formed in the pump housing by two intermeshing screw rotors multiple Closing chamber, under the drive of gear, a pair of of screw rotor does the movement of incorgruous dual AC power in pump chamber, seal chamber continuously from The outlet of pump is shifted in the import of pump, is completed the sucking, pressurization and discharge process of medium, is realized the conveying of liquid.Quimby pump tool There are pulse free, with small vibration, high reliablity, the distinguishing feature that stability is good, suction capacity is strong, is widely used at present in oil field, makes Ship industry, petro chemical industry, field of food industry.
In the Design and manufacturing process of screw pump, the design of screw rotor end face molded line has larger impact to the performance of pump. Common Quimby pump profile is made of cycloid and involute, and is mostly 1 to 1 transmission.To improve common twin-screw The performance of rotor, Chinese patent (patent No. CN201720524780.9) propose a kind of complete smooth dual-screw pump screw turn Son, the rotor replace common point gearing cycloid using two sections of circular arcs and its envelope, alleviate the wear problem at cusp, structure It being smoothly connected between curve, molded line is properly engaged with completely, have the advantages that good sealing performance, mechanical characteristic are good, but Cause the problem that capacity utilization is low, flow is small.With social development, the screw pump demand of small dimension is increasingly increased Add, conventional twin screw pump is applied in big flow occasion mostly, and structure is complicated.How minimize manufacture when meet traffic requirement And guarantee that good sealing and stress performance become the key of problem.
Summary of the invention
The present invention is in order to improve the flow of Quimby pump, while in order to enrich dual-screw pump screw rotor end-face molded line class Type, the present invention propose a kind of big flow screw rotor of Quimby pump.The tip circle and root radius of two screw rods are equal, and left screw rod turns The transmission ratio of sub and right screw rotor be 2 to 1, identical casings size down-off than original Quimby pump raising 15%~ 25%, it is more more simple and compact than original Quimby pump structure in same traffic.The present invention is sliding using variable speed screw linear light The addendum circle arc and tooth root circular arc in the molded line of left side are connected, and acquires variable speed screw line in the case where transmission ratio is 2 to 1 Conjugate curves, engage curtate epicycloid equidistant curve using circular arc, and in right side, molded line realizes addendum circle arc and tooth root circular arc It is smoothly connected, and combines prolate epicycloid, form symmetrical structure.The flow for increasing Quimby pump, improve screw rotor by Power situation improves the performance of Quimby pump, type and its work of raising to abundant dual-screw pump screw rotor end-face molded line Performance is of great significance.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of big flow screw rotor of Quimby pump, comprising: left screw rotor and right screw rotor;Left screw rotor Left side molded line is made of 4 sections of curves and 1 point, in the direction of the clock successively are as follows: curtate epicycloid equidistant curve AB, point B, tooth Tip circle arc BC, variable speed screw line CD, tooth root circular arc DA;Variable speed screw line CD in the left side molded line glossily tooth connection Acute angle cusp is not present in tip circle arc BC and tooth root circular arc DA;
The right side molded line of right screw rotor is made of 10 sections of curves, counterclockwise successively are as follows: is put outside the first long width Line ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves cd, the first addendum circle arc de, the first tip circular-arc ef, Two prolate epicycloid fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tooth Sharp circular arc ja;Right side molded line is about its centre of gyration O2Be it is centrosymmetric, i.e., with centre of gyration O2Centered on by right side type Line coincides after rotating 180 ° with its own.
A kind of big flow screw rotor of Quimby pump, left side molded line and right side molded line are in left screw rotor It can be realized correct engagement, meshing relation in the incorgruous dual AC power movement for being 2 to 1 with right screw rotor transmission ratio are as follows: left end The point B of face molded line is meshed with the first prolate epicycloid ab of right side molded line, the second prolate epicycloid fg;Left side molded line Curtate epicycloid equidistant curve AB is meshed with the first tip circular-arc ef of right side molded line, the second tip circular-arc ja;Left side The addendum circle arc BC of molded line is meshed with the first tooth root circular arc bc of right side molded line, the second tooth root circular arc gh;Left side molded line Variable speed screw line CD and right side molded line the first variable speed screw line conjugate curves cd, the second variable speed screw line conjugate curves hi It is meshed;The tooth root circular arc DA of left side molded line is nibbled with the first addendum circle arc de of right side molded line, the second addendum circle arc ij phase It closes.
A kind of design method of the big flow screw rotor of the Quimby pump the following steps are included:
1) following parameter is given: left pitch radius R1;Root radius R2;Radius of addendum R3;The center variable speed screw line CD Angle θ;Curtate epicycloid equidistant curve AB central angle alpha;First tip circular-arc radius r;Right pitch radius R is acquired by following relationship4、 First radius of addendum R5, the first root radius R6: R4=2R1;R5=R3;R6=R2
2) with the centre of gyration O of left screw rotor1Coordinate system is established for origin, determines tooth root circular arc DA by following equation:
In formula: t is angle parameter, rad;
3) addendum circle arc BC is determined by following equation:
4) curtate epicycloid equidistant curve AB is determined by following equation:
Wherein:
In formula: MABFor rotational transformation matrix, β is rotation angle,For initial curtate epicycloid Equidistant curve equation, L For rotor centre distance, L=R1+R4
5) variable speed screw line CD is determined by following equation:
6) with the centre of gyration O of right screw rotor2Coordinate system is established for origin, determines the first tooth root circular arc by following equation Bc:
7) the first addendum circle arc de is determined by following equation:
8) the first variable speed screw line conjugate curves cd is determined by following equation:
In formula:For the first intermediate variable, determined by following equation:
9) the first prolate epicycloid ab is determined by following equation:
10) the first tip circular-arc ef is determined by following equation:
In formula: Xef、YefThe respectively abscissa and ordinate in the tip circular-arc center of circle;
11) respectively by the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves Cd, the first addendum circle arc de, the first tip circular-arc ef are with centre of gyration O2Centered on rotation 180 ° obtain the second prolate epicycloid Fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circular-arc ja;
12) the left side molded line is made into axial screw expansion along left helix and generates left screw rotor;By what is obtained Right side molded line makees axial screw expansion along right-hand helix and generates right screw rotor;Wherein the screw pitch of right screw rotor is left screw rod 2 times of rotor screw pitch.
The invention has the benefit that
1. the tip circle and root radius of two screw rods are equal, the transmission ratio of left screw rotor and right screw rotor is 2 to 1, Identical casings size down-off improves 15%~25% than the Quimby pump that original transmission ratio is 1 to 1, in same traffic It is more more simple and compact than original Quimby pump structure, miniaturization manufacture demand is met under the premise of guaranteeing flow.
2. using the engagement system of circular arc and curtate epicycloid equidistant curve, make that acute angle cusp is not present in profile, The mechanical characteristic for improving screw rotor, improves the service life of screw rotor.
3. enriching dual-screw pump screw rotor end-face molded line type.
Detailed description of the invention
Fig. 1 is the left side molded lines of left screw rotor (1).
Fig. 2 is the right side molded lines of right screw rotor (2).
Fig. 3 is two screw rods rotor end-face molded line engagement figure.
Fig. 4 engages time chart with the first variable speed screw line conjugate curves for variable speed screw line.
Fig. 5 engages time chart with the first addendum circle arc for tooth root circular arc.
Fig. 6 engages time chart with the first tip circular-arc for curtate epicycloid equidistant curve.
Fig. 7 engages time chart with the first tooth root circular arc for addendum circle arc.
Fig. 8 is left screw rotor (1) three-dimensional figure.
Fig. 9 is right screw rotor (2) three-dimensional figure.
Figure 10 is two screw rods rotor engagement figure.
In figure: 1-left screw rotor;2-right screw rotors;101-left side molded line;201-right side molded line;R1— Left pitch radius;R2- root radius;R3- radius of addendum;R4- right pitch radius;R5- the first radius of addendum;R6— First root radius;The first tip circular-arc radius of r-;α-curtate epicycloid equidistant curve central angle;θ-variable speed screw line Central angle;β-rotation angle.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, being the left side molded lines of left screw rotor 1, the left side molded line 101 of left screw rotor 1 is by 4 sections Curve and 1 point composition, in the direction of the clock successively are as follows: curtate epicycloid equidistant curve AB, point B, addendum circle arc BC, speed change spiral shell Spin line CD, tooth root circular arc DA;Variable speed screw line CD in the left side molded line 101 glossily connects addendum circle arc BC and tooth Acute angle cusp is not present in root circular arc DA;Molded line generation type is as follows:
1) following parameter is given: left pitch radius R1;Root radius R2;Radius of addendum R3;The center variable speed screw line CD Angle θ;Curtate epicycloid equidistant curve AB central angle alpha;First tip circular-arc radius r;Right pitch radius R is acquired by following relationship4、 First radius of addendum R5, the first root radius R6: R4=2R1;R5=R3;R6=R2
2) with the centre of gyration O of left screw rotor 11Coordinate system is established for origin, determines tooth root circular arc DA by following equation:
In formula: t is angle parameter, rad;
3) addendum circle arc BC is determined by following equation:
4) curtate epicycloid equidistant curve AB is determined by following equation:
Wherein:
In formula: MABFor rotational transformation matrix, β is rotation angle,For initial curtate epicycloid Equidistant curve equation, L is rotor centre distance, L=R1+R4
5) variable speed screw line CD is determined by following equation:
As shown in Fig. 2, being the right side molded lines of right screw rotor 2, the right side molded line 201 of right screw rotor 2 is by 10 Section curve composition, counterclockwise successively are as follows: the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line Conjugate curves cd, the first addendum circle arc de, the first tip circular-arc ef, the second prolate epicycloid fg, the second tooth root circular arc gh, second Variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circular-arc ja;Right side molded line 201 is about in its revolution Heart O2Be it is centrosymmetric, i.e., with centre of gyration O2Centered on rotation 180 ° after be overlapped with itself;Molded line generation type is as follows:
1) following parameter is given: left pitch radius R1;Root radius R2;Radius of addendum R3;The center variable speed screw line CD Angle θ;Curtate epicycloid equidistant curve AB central angle alpha;First tip circular-arc radius r;Right pitch radius R is acquired by following relationship4、 First radius of addendum R5, the first root radius R6: R4=2R1;R5=R3;R6=R2
2) with the centre of gyration O of right screw rotor 22Coordinate system is established for origin, determines the first root circle by following equation Arc bc:
3) the first addendum circle arc de is determined by following equation:
4) the first variable speed screw line conjugate curves cd is determined by following equation:
In formula:For the first intermediate variable, determined by following equation:
5) the first prolate epicycloid ab is determined by following equation:
6) the first tip circular-arc ef is determined by following equation:
In formula: Xef、YefThe respectively abscissa and ordinate in the tip circular-arc center of circle;
7) respectively by the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves Cd, the first addendum circle arc de, the first tip circular-arc ef are with centre of gyration O2Centered on rotation 180 ° obtain the second prolate epicycloid Fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circular-arc ja;
As shown in figure 3, left side molded line 101 and right side molded line 201 are on a left side for two screw rods rotor end-face molded line engagement figure It can be realized correct engagement in the incorgruous dual AC power movement that screw rotor 1 and 2 transmission ratio of right screw rotor are 2 to 1;Engagement is closed System are as follows: the point B of left side molded line 101 is nibbled with the first prolate epicycloid ab of right side molded line 201, the second prolate epicycloid fg phase It closes;The curtate epicycloid equidistant curve AB of left side molded line 101 and the first tip circular-arc ef, the second tooth of right side molded line 201 Sharp circular arc ja is meshed;First tooth root circular arc bc of the addendum circle arc BC of left side molded line 101 and right side molded line 201, second Tooth root circular arc gh is meshed;The variable speed screw line CD of left side molded line 101 and the first variable speed screw line of right side molded line 201 are total Yoke curve cd, the second variable speed screw line conjugate curves hi are meshed;The tooth root circular arc DA and right side molded line of left side molded line 101 201 the first addendum circle arc de, the second addendum circle arc ij is meshed.
As shown in figure 4, engage time chart with the first variable speed screw line conjugate curves for variable speed screw line, variable speed screw line and First variable speed screw line conjugate curves correct engagement.
As shown in figure 5, engaging time chart with the first addendum circle arc for tooth root circular arc, tooth root circular arc and the first addendum circle arc are just Really engagement.
As shown in fig. 6, engaging time chart with the first tip circular-arc for curtate epicycloid equidistant curve, curtate epicycloid is equidistant Curve and the first tip circular-arc correct engagement.
As shown in fig. 7, engaging time chart with the first tooth root circular arc for addendum circle arc, addendum circle arc and the first tooth root circular arc are just Really engagement.
As shown in figure 8, being left 1 three-dimensional figure of screw rotor, the left side molded line 101 is made into axial screw along left helix Rotation expansion generates left screw rotor 1, and left screw rotor 1 is single head constant pitch screw rod.
As shown in figure 9, being right 2 three-dimensional figure of screw rotor, obtained right side molded line 102 is made into axial screw along right-hand helix Rotation expansion generates right screw rotor 2, and right screw rotor 2 is double end constant pitch screw rod.
It as shown in Figure 10, is two screw rods rotor engagement figure, wherein the screw pitch of right screw rotor 2 is left 1 screw pitch of screw rotor 2 times.Two screw rotors can be realized correct engagement in the incorgruous dual AC power movement that transmission ratio is 2 to 1, and there is no interference Or have neither part nor lot in the part of engagement.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.

Claims (3)

1. a kind of big flow screw rotor of Quimby pump, comprising: left screw rotor (1) and right screw rotor (2);Its feature Be: the left side molded line (101) of left screw rotor (1) is made of 4 sections of curves and 1 point, in the direction of the clock successively are as follows: short width Epicycloid equidistant curve AB, point B, addendum circle arc BC, variable speed screw line CD, tooth root circular arc DA;The left side molded line (101) In variable speed screw line CD glossily connect addendum circle arc BC and tooth root circular arc DA, be not present acute angle cusp;
The right side molded line (201) of right screw rotor (2) is made of 10 sections of curves, counterclockwise successively are as follows: the first long width Epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves cd, the first addendum circle arc de, the first tip circular-arc Ef, the second prolate epicycloid fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, Two tip circular-arc ja;Right side molded line (201) is about its centre of gyration O2Be it is centrosymmetric, i.e., with centre of gyration O2Centered on It coincides after right side molded line (201) are rotated 180 ° with its own.
2. a kind of big flow screw rotor of Quimby pump as described in claim 1, it is characterized in that: left side molded line (101) With right side molded line (201) in the incorgruous dual AC power movement that left screw rotor (1) and right screw rotor (2) transmission ratio are 2 to 1 It can be realized correct engagement, meshing relation are as follows: the point B of left side molded line (101) and the first long width of right side molded line (201) Epicycloid ab, the second prolate epicycloid fg are meshed;The curtate epicycloid equidistant curve AB of left side molded line (101) and right side The first tip circular-arc ef, the second tip circular-arc ja of molded line (201) are meshed;The addendum circle arc BC of left side molded line (101) with The first tooth root circular arc bc, the second tooth root circular arc gh of right side molded line (201) are meshed;The speed change spiral shell of left side molded line (101) First variable speed screw line conjugate curves cd of the spin line CD with right side molded line (201), the second variable speed screw line conjugate curves hi phase Engagement;The tooth root circular arc DA of left side molded line (101) and the first addendum circle arc de, second outside circle of right side molded line (201) Arc ij is meshed.
3. a kind of design method of the big flow screw rotor of Quimby pump as described in claim 1, it is characterized in that: include with Lower step:
1) following parameter is given: left pitch radius R1;Root radius R2;Radius of addendum R3;Variable speed screw line CD central angle θ; Curtate epicycloid equidistant curve AB central angle alpha;First tip circular-arc radius r;Right pitch radius R is acquired by following relationship4, first Radius of addendum R5, the first root radius R6: R4=2R1;R5=R3;R6=R2
2) with the centre of gyration O of left screw rotor (1)1Coordinate system is established for origin, determines tooth root circular arc DA by following equation:
In formula: t is angle parameter, rad;
3) addendum circle arc BC is determined by following equation:
4) curtate epicycloid equidistant curve AB is determined by following equation:
Wherein:
In formula: MABFor rotational transformation matrix, β is rotation angle,For initial curtate epicycloid Equidistant curve equation, L is to turn Subcenter is away from L=R1+R4
5) variable speed screw line CD is determined by following equation:
6) with the centre of gyration O of right screw rotor (2)2Coordinate system is established for origin, determines the first tooth root circular arc by following equation Bc:
7) the first addendum circle arc de is determined by following equation:
8) the first variable speed screw line conjugate curves cd is determined by following equation:
In formula:For the first intermediate variable, determined by following equation:
9) the first prolate epicycloid ab is determined by following equation:
10) the first tip circular-arc ef is determined by following equation:
In formula: Xef、YefThe respectively abscissa and ordinate in the tip circular-arc center of circle;
11) respectively by the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves cd, First addendum circle arc de, the first tip circular-arc ef are with centre of gyration O2Centered on rotation 180 ° obtain the second prolate epicycloid fg, Second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circular-arc ja;
12) the left side molded line (101) is made into axial screw expansion along left helix and generates left screw rotor (1);Will To right side molded line (102) make axial screw expansion along right-hand helix and generate right screw rotor (2);Wherein right screw rotor (2) screw pitch is 2 times of left screw rotor (1) screw pitch.
CN201910670831.2A 2019-07-24 2019-07-24 A kind of the big flow screw rotor and its design method of Quimby pump Pending CN110242561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910670831.2A CN110242561A (en) 2019-07-24 2019-07-24 A kind of the big flow screw rotor and its design method of Quimby pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910670831.2A CN110242561A (en) 2019-07-24 2019-07-24 A kind of the big flow screw rotor and its design method of Quimby pump

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111367233A (en) * 2020-03-12 2020-07-03 杭州兴龙泵业有限公司 Three-dimensional model modeling system for machining double-screw pump molded lines by disc milling cutter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111367233A (en) * 2020-03-12 2020-07-03 杭州兴龙泵业有限公司 Three-dimensional model modeling system for machining double-screw pump molded lines by disc milling cutter
CN111367233B (en) * 2020-03-12 2021-03-16 杭州兴龙泵业有限公司 Three-dimensional model modeling system for machining double-screw pump molded lines by disc milling cutter

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