CN206694248U - A kind of complete smooth twin-screw liquid pump screw rotor - Google Patents

A kind of complete smooth twin-screw liquid pump screw rotor Download PDF

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Publication number
CN206694248U
CN206694248U CN201720524780.9U CN201720524780U CN206694248U CN 206694248 U CN206694248 U CN 206694248U CN 201720524780 U CN201720524780 U CN 201720524780U CN 206694248 U CN206694248 U CN 206694248U
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mrow
equal space
line
circle
circular arc
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CN201720524780.9U
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张凌宏
崔锋
王君
刘瑞青
崔冬
刘强
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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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Abstract

The utility model discloses a kind of complete smooth twin-screw liquid pump screw rotor, its left side molded line (501) includes 6 sections of circular arcs, 2 sections of long epicycloidal equal space lines and 2 sections of epicycloidal equal space lines;It is followed successively by counterclockwise:Tooth root circular arc LAB, the equal space line BC of prolate epicycloid, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc EF, addendum circle arc FGH, the second circular arc HI, the second epicycloidal equal space line IJ, the second transition arc JK, the equal space line KL of the second prolate epicycloid;In described left side molded line (501), it is smoothly connected between its adjacent curve, in the absence of rough tie point, forms complete smooth profile;Left side molded line (501) is identical with right side molded line (502), and it can realize correct engagement in synchronous incorgruous dual AC power motion;Obtain complete smooth screw rotor.

Description

A kind of complete smooth twin-screw liquid pump screw rotor
Technical field
It the utility model is related to twin-screw liquid pump, more particularly to a kind of complete smooth pair suitable for twin-screw liquid pump Screw rod liquid pump screw rotor.
Background technology
Twin-screw liquid pump is a kind of proof positive displacement liquid pump, is formed by two intermeshing screw rotors in the pump housing Multiple closing chambers, synchronous different is acted by the band of synchromesh gear and moved to dual AC power, annular seal space continuously shifts to row from suction inlet Outlet, realizes the conveying of liquid.Its core component is a pair of intermeshing screw rotors, the design of screw rotor end face molded line Directly influence the performance of pump.Conventional twin-screw liquid pump profile is by the envelope of circular arc-circular arc and point gearing pendulum Line forms;Four rough tie points in this screw rotor end face molded line be present, screw rotor easily wears, and reduces pump Service life, the leakage rate of pump can be increased in the course of work, so as to reduce the capacity utilization of twin-screw liquid pump.
Utility model content
The utility model is in order to solve the above problems, while in order to enrich twin-screw liquid pump screw rotor end face molded line class A kind of type, it is proposed that complete smooth twin-screw liquid pump screw rotor.The utility model is using the equal space line of circular arc and cycloid Engagement system replaces the engagement system of conventional point and cycloid so that and realize and be smoothly connected between each curved section in profile, There is no rough tie point;And then obtain complete smooth screw rotor.In the course of work, screw rotor end face molded line is in synchronous different Correct engagement can be realized by being moved down to dual AC power, and the engagement between profile is changed into line engagement from original point gearing, enters And the engagement between screw rotor is changed into face engagement from original line engagement;Improve the wearability and sealing of screw rotor Energy, improve the service life of screw rotor;The enclosed volume formed in screw rotor engagement process is also reduced simultaneously, is improved The performance of twin-screw liquid pump;To enriching the type of twin-screw liquid pump screw rotor end face molded line and improving its service behaviour It is significant.
To achieve these goals, the utility model adopts the following technical scheme that:
A kind of complete smooth twin-screw liquid pump screw rotor, including left screw rotor (701) and right screw rotor (702);The left side molded line (501) of left screw rotor (701) includes 6 sections of circular arcs, 2 sections of long epicycloidal equal space lines and 2 sections Epicycloidal equal space line;The left side molded line (501) of left screw rotor (701) is followed successively by counterclockwise:Tooth root circular arc LAB, the equal space line BC of prolate epicycloid, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc EF, addendum circle arc FGH, the second circular arc HI, the second epicycloidal equal space line IJ, the second transition arc JK, the equal space line KL of the second prolate epicycloid; In described left side molded line (501), it is smoothly connected between its adjacent curve, in the absence of rough tie point, is formed complete smooth Profile;Described left side molded line (501) is symmetrical on y-axis;Using the first circular arc EF, epicycloidal equal space line DE, First Transition circular arc C D, the equal space line BC of prolate epicycloid and the second circular arc HI, the second epicycloidal equal space line IJ, the second transition Addendum circle arc FGH and tooth root circular arc LAB are smoothly connected by circular arc JK, the second prolate epicycloid equal space line KL, eight sections of curves.
A kind of complete smooth twin-screw liquid pump screw rotor, the left side molded line (501) of left screw rotor (701) and the right side The right side molded line (502) of screw rotor (702) is identical;Left side molded line (501) and right side molded line (502) are in synchronization It can realize correct engagement in the motion of incorgruous dual AC power, the tooth root circular arc LAB's, prolate epicycloid in left side molded line (501) Equal space line BC, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc EF, addendum circle arc FGH, the second circular arc HI, Two epicycloidal equal space line IJ, the second transition arc JK, the equal space line KL of the second prolate epicycloid, respectively with right side molded line Addendum circle arc fgh, the first circular arc ef, epicycloidal equal space line de, First Transition circular arc cd, prolate cycloid in (502) etc. Away from line bc, tooth root circular arc lab, the equal space line kl of the second prolate epicycloid, the second transition arc jk, the second epicycloidal equal space line Ij, the second circular arc ih correct engagements
A kind of complete smooth twin-screw liquid pump screw rotor, the left side molded line (501) of its left screw rotor (701) It is characterized in:
1. generate 5 sections of curves, respectively root circle (1), outside circle (2), pitch circle (3), prolate epicycloid by below equation (4) and epicycloid (5), each section of curvilinear equation are as follows:
The equation of root circle (1) is:
The equation of outside circle (2) is:
The equation of pitch circle (3) is:
The equation of prolate epicycloid (4) is:
The equation of epicycloid (5) is:
More than:T-be angle parameter, rad;R2- it is pitch radius, mm;R1- it is radius of addendum, mm;R3- it is tooth Root radius, mm;And 2R2=R1+R3;r1- circle (7) radius;r2- transition circle (9) radius;
2. by epicycloid (5) pair-wise offset r laterally2Epicycloidal equal space line (6) is obtained, by epicycloidal equal space line (6) pair-wise offset r laterally1, and with O2It is the center of circle with R1-r1Intersect for the circle of radius, it is r that radius is made in intersection as center1 Circle (7), circle (7) and outside circle (2) it is tangent, point of contact F is tangent with epicycloidal equal space line (6), point of contact E, obtains first Circular arc EF and epicycloidal equal space line DE;
3. by prolate epicycloid (4) pair-wise offset r laterally1The equal space line (8) of prolate epicycloid is obtained, with O2For the center of circle With R1-r2Intersect for the circle of radius with x-axis, it is r that radius is made in intersection as center2Transition circle (9), by prolate epicycloid etc. Away from line (8) rotation alpha angle, it is tangent to obtain the equal space line (8) of transition circle (9) and prolate epicycloid, point of contact C, transition circle (9) with it is outer The equal space line (6) of cycloid is tangent, point of contact D, obtains the equal space line BC of First Transition circular arc C D and prolate epicycloid;
Wherein, the anglec of rotation(xw, yw) be following bar curve intersection point;
It is the center of circle with R using O1-r1For the circle of radius:x2+y2=(R1-r1)2
Epicycloidal equal space line (6) pair-wise offset r laterally1The curve obtained afterwards, its equation are as follows:
4. by the equal space line BC of prolate epicycloid obtained above, First Transition circular arc C D, epicycloidal equal space line DE and First circular arc EF symmetrically obtains the equidistant curve KL of the second prolate epicycloid, the second transition arc JK on y-axis, put outside second The equidistant curve IJ of line and the second circular arc HI.
A kind of complete smooth twin-screw liquid pump screw rotor, left screw rotor (701) is by left side molded line (501) along a left side Helix makees axial screw expansion generation;Right screw rotor (702) makees axial screw by right side molded line (502) along right-hand helix Expansion generation;It can realize between helical tooth flank on left screw rotor (701) and right screw rotor (702) and all be smoothly connected, Form complete smooth twin-screw liquid pump screw rotor;
Right-hand helix equation is:
Left-hand screw line equation is:
More than:R-helix radius, mm;P-screw rotor pitch, mm;τ-spiral the angle of spread, rad;N-pitch Number.
A kind of complete smooth twin-screw liquid pump screw rotor, by the left side molded line (501) of left screw rotor (701) Addendum circle arc FGH corresponding to central angle β be changed to 90-2 α, central angle corresponding to tooth root circular arc LAB is also changed to 90-2 α, obtains double Tooth screw rotor side profile (401), side profile (401) are uniformly distributed on pitch-line by 180 °, just Obtain complete bidentate screw rotor end face molded line (402).
A kind of twin-screw liquid pump, use a kind of above-mentioned complete smooth twin-screw liquid pump screw rotor.
A kind of twin-screw liquid pump, use a kind of complete smooth twin-screw liquid pump screw rotor of above-mentioned bidentate.
A kind of complete smooth twin-screw liquid pump screw rotor tool advantages below proposed:
1. the engagement system of the equal space line using circular arc and cycloid, realize in profile smooth company between each curved section Connect, improve the mechanical characteristic of screw rotor, improve the wear-resisting and service life of screw rotor;
2. in the course of work, the engagement between screw rotor is changed into face engagement from original line engagement;Screw rod is improved to turn The wearability and sealing property of son, improve the service life of screw rotor;
3. reducing the enclosed volume formed in screw rotor engagement process, the performance of twin-screw liquid pump is improved;
4. enrich twin-screw liquid pump screw rotor end face molded line type.
Brief description of the drawings
Fig. 1 is the screw rotor end face molded lines of conventional twin-screw liquid pump.
Fig. 2 is complete smooth twin-screw liquid pump screw rotor left side molded line (501) figure.
Fig. 3 is the generation figure of complete smooth twin-screw liquid pump screw rotor left side molded line (501).
Fig. 4 is a kind of generation figure of the complete smooth twin-screw liquid pump screw rotor end face molded line of bidentate.
Fig. 5 is the engagement figure of 2 complete smooth profiles.
Fig. 6 is engagement figure of 2 complete smooth profiles at out of phase.
Fig. 7 is the engagement figure of 2 complete smooth twin-screw liquid pump screw rotors.
In figure:R2- it is pitch radius;R1- it is radius of addendum;R3- it is root radius;r1- circle (7) radius; r2- transition circle (9) radius;401-bidentate screw rotor side profile;402-bidentate screw rotor end face molded line; 501-left side molded line;502-right side molded line;701-left screw rotor;702-right screw rotor;1-root circle;2— Outside circle;3-pitch circle;4-prolate epicycloid;5-epicycloid;6-epicycloidal equal space line;7-circle;8-prolate epicycloid Equal space line;9-transition circle;α-the anglec of rotation.
Embodiment:
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, it is the screw rotor end face molded lines of conventional twin-screw liquid pump, by tooth root circular arc AB, long width Epicycloid BC, epicycloid CD, addendum circle arc DE, epicycloid EF, prolate epicycloid FA compositions;Distinguish in prolate epicycloid BC, FA Have two rough tie points with epicycloid CD, EF junctions, and when epicycloid CD and EF is connected with addendum circle arc DE there is also Two rough tie points;Due to the presence of rough tie point, screw rotor end face molded line is rough, reduces screw rotor Wearability and stress performance.
As shown in Fig. 2 be complete smooth twin-screw liquid pump screw rotor left side molded line (501) figure, left side molded line (501) 6 sections of circular arcs, 2 sections of long epicycloidal equal space lines and 2 sections of epicycloidal equal space lines are included;Left side molded line (501) is by inverse Clockwise is followed successively by:Tooth root circular arc LAB, the equal space line BC of prolate epicycloid, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc EF, addendum circle arc FGH, the second circular arc HI, the second epicycloidal equal space line IJ, the second transition arc JK, second The equal space line KL of prolate epicycloid;In described left side molded line (501), it is smoothly connected between its adjacent curve, in the absence of not It is smoothly connected a little, forms complete smooth profile;Described left side molded line (501) is symmetrical on y-axis;Using the first circular arc EF, epicycloidal equal space line DE, First Transition circular arc C D, the equal space line BC of prolate epicycloid and the second circular arc HI, second are put outside The equal space line IJ of line, the second transition arc JK, the equal space line KL of the second prolate epicycloid, eight sections of curves by addendum circle arc FGH and Tooth root circular arc LAB is smoothly connected.It can be seen that the complete smooth twin-screw liquid pump screw rotor end face molded line proposed, realizes each song Being smoothly connected between line segment, eliminate rough tie point;The wearability of screw rotor is improved, improves the stress of screw rotor Characteristic, improve the service life of screw rotor.
As shown in figure 3, being the generation figure of complete smooth twin-screw liquid pump screw rotor left side molded line (501), it is given birth to It is as follows into process:
1. generate 5 sections of curves, respectively root circle (1), outside circle (2), pitch circle (3), prolate epicycloid by below equation (4) and epicycloid (5), each section of curvilinear equation are as follows:
The equation of root circle (1) is:
The equation of outside circle (2) is:
The equation of pitch circle (3) is:
The equation of prolate epicycloid (4) is:
The equation of epicycloid (5) is:
More than:T-be angle parameter, rad;R2- it is pitch radius, mm;R1- it is radius of addendum, mm;R3- it is tooth Root radius, mm;And 2R2=R1+R3;r1- circle (7) radius;r2- transition circle (9) radius;
2. by epicycloid (5) pair-wise offset r laterally2Epicycloidal equal space line (6) is obtained, by epicycloidal equal space line (6) pair-wise offset r laterally1, and with O2It is the center of circle with R1-r1Intersect for the circle of radius, it is r that radius is made in intersection as center1 Circle (7), circle (7) and outside circle (2) it is tangent, point of contact F is tangent with epicycloidal equal space line (6), point of contact E, obtains first Circular arc EF and epicycloidal equal space line DE;
3. by prolate epicycloid (4) pair-wise offset r laterally1The equal space line (8) of prolate epicycloid is obtained, with O2For the center of circle With R1-r2Intersect for the circle of radius with x-axis, it is r that radius is made in intersection as center2Transition circle (9), by prolate epicycloid etc. Away from line (8) rotation alpha angle, it is tangent to obtain the equal space line (8) of transition circle (9) and prolate epicycloid, point of contact C, transition circle (9) with it is outer The equal space line (6) of cycloid is tangent, point of contact D, obtains the equal space line BC of First Transition circular arc C D and prolate epicycloid;
Wherein, the anglec of rotation(xw, yw) be following bar curve intersection point:
It is the center of circle with R using O1-r1For the circle of radius:x2+y2=(R1-r1)2
Epicycloidal equal space line (6) pair-wise offset r laterally1The curve obtained afterwards, its equation are as follows:
4. by the equal space line BC of prolate epicycloid obtained above, First Transition circular arc C D, epicycloidal equal space line DE and First circular arc EF symmetrically obtains the equidistant curve KL of the second prolate epicycloid, the second transition arc JK on y-axis, put outside second The equidistant curve IJ of line and the second circular arc HI.
As shown in figure 4, being a kind of generation figure of the complete smooth twin-screw liquid pump screw rotor end face molded line of bidentate, it is given birth to Into being on the basis of left side molded line (501) generation, central angle β corresponding to addendum circle arc FGH is changed to 90-2 α, root circle Central angle is also changed to 90-2 α corresponding to arc LAB, obtains bidentate screw rotor side profile (401), bidentate screw rotor one Side end face molded line (401) is uniformly distributed on pitch-line by 180 °, just obtains complete bidentate screw rotor end face molded line (402)。
As shown in figure 5, for the engagement figure of 2 complete smooth profiles, intermeshing left side molded line (501) and the right side Profile (502) is identical;In the course of work, tooth root circular arc LAB's, prolate epicycloid in left side molded line (501) Equal space line BC, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc EF, addendum circle arc FGH, the second circular arc HI, Two epicycloidal equal space line IJ, the second transition arc JK, the equal space line KL of the second prolate epicycloid, respectively with right side molded line Addendum circle arc fgh, the first circular arc ef, epicycloidal equal space line de, First Transition circular arc cd, prolate cycloid in (502) etc. Away from line bc, tooth root circular arc lab, the equal space line kl of the second prolate epicycloid, two transition arc jk, the second epicycloidal equal space line Ij, the second circular arc ih, can realize the correct engagement between curved section.
As shown in fig. 6, the engagement figure for 2 complete smooth profiles at out of phase, each phase in (a)~(e) figures 4 ° of carrier phase shift between adjacent figure, wherein (a) figure screw rotor end face molded line and the positive angle of x-axis are 10 °, i.e., by left end Face molded line (501) turns clockwise 14 °, and 14 ° of right side molded line (502) rotate counterclockwise obtains;(e) it is~(g) each adjacent in figure 8 ° of carrier phase shift between figure;(g)~(h) 10 ° of carrier phase shift between figure;In (a)~(g) figures, left side molded line (501) In First Transition circular arc C D and right side molded line (502) in epicycloidal equal space line de be intermeshed;In (d)~(g) figures The equal space line BC of prolate epicycloid in left side molded line (501) is intermeshed with the first circular arc ef in right side molded line (502); Left side molded line (501) is symmetrical on y-axis, and left side molded line (501) is identical with right side molded line (502), then closes There is identical meshing relation in the symmetrical constituent curve of y-axis.
As shown in fig. 7, be the engagement figure of 2 complete smooth twin-screw liquid pump screw rotors, left screw rotor (701) by Left side molded line (501) makees axial screw expansion generation along left-hand screw line;Right screw rotor (702) is by right side molded line (502) Make axial screw expansion generation along right-hand helix;Energy between helical tooth flank on left screw rotor (701) and right screw rotor (702) Enough realize all is smoothly connected, and forms complete smooth twin-screw liquid pump screw rotor.
It is not new to this practicality although above-mentioned specific embodiment of the present utility model is described with reference to accompanying drawing The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Field technique personnel need not pay the various modifications that creative work can make or deformation still in protection model of the present utility model Within enclosing.

Claims (7)

1. a kind of complete smooth twin-screw liquid pump screw rotor, including left screw rotor (701) and right screw rotor (702); The left side molded line (501) of left screw rotor (701) includes 6 sections of circular arcs, 2 sections of long epicycloidal equal space lines and 2 sections of epicycloids Equal space line;It is characterized in that:The left side molded line (501) of left screw rotor (701) is followed successively by counterclockwise:Tooth root circular arc LAB, the equal space line BC of prolate epicycloid, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc EF, addendum circle arc FGH, the second circular arc HI, the second epicycloidal equal space line IJ, the second transition arc JK, the equal space line KL of the second prolate epicycloid; In described left side molded line (501), it is smoothly connected between its adjacent curve, in the absence of rough tie point, is formed complete smooth Profile;Described left side molded line (501) is symmetrical on y-axis;Using the first circular arc EF, epicycloidal equal space line DE, First Transition circular arc C D, the equal space line BC of prolate epicycloid and the second circular arc HI, the second epicycloidal equal space line IJ, the second transition Addendum circle arc FGH and tooth root circular arc LAB are smoothly connected by circular arc JK, the second prolate epicycloid equal space line KL, eight sections of curves.
2. a kind of complete smooth twin-screw liquid pump screw rotor as claimed in claim 1, it is characterized in that:Left screw rotor (701) left side molded line (501) is identical with the right side molded line (502) of right screw rotor (702);Left side molded line (501) and right side molded line (502) can realize correct engagement, left side molded line (501) in synchronous incorgruous dual AC power motion In tooth root circular arc LAB, equal space line BC, First Transition circular arc C D, epicycloidal equal space line DE, the first circular arc of prolate epicycloid EF, addendum circle arc FGH, the second circular arc HI, the second epicycloidal equal space line IJ, the second transition arc JK, the second prolate epicycloid Equal space line KL, respectively with the addendum circle arc fgh in right side molded line (502), the first circular arc ef, epicycloidal equal space line de, First Transition circular arc cd, the equal space line bc of prolate cycloid, tooth root circular arc lab, the equal space line kl of the second prolate epicycloid, the second mistake Cross circular arc jk, the second epicycloidal equal space line ij, the second circular arc ih correct engagements.
3. a kind of complete smooth twin-screw liquid pump screw rotor as claimed in claim 1, a left side for its left screw rotor (701) Profile (501) is characterized in:
1. by below equation generate 5 sections of curves, respectively root circle (1), outside circle (2), pitch circle (3), prolate epicycloid (4) and Epicycloid (5), each section of curvilinear equation are as follows:
The equation of root circle (1) is:
The equation of outside circle (2) is:
The equation of pitch circle (3) is:
The equation of prolate epicycloid (4) is:
The equation of epicycloid (5) is:
More than:T-be angle parameter, rad;R2- it is pitch radius, mm;R1- it is radius of addendum, mm;R3- it is root circle Radius, mm;And 2R2=R1+R3;r1- circle (7) radius;r2- transition circle (9) radius;
2. by epicycloid (5) pair-wise offset r laterally2Epicycloidal equal space line (6) is obtained, epicycloidal equal space line (6) is outside Side pair-wise offset r1, and with O2It is the center of circle with R1-r1Intersect for the circle of radius, it is r that radius is made in intersection as center1Circle (7), Circle (7) and outside circle (2) is tangent, and point of contact F is tangent with epicycloidal equal space line (6), point of contact E, obtain the first circular arc EF with Epicycloidal equal space line DE;
3. by prolate epicycloid (4) pair-wise offset r laterally1The equal space line (8) of prolate epicycloid is obtained, with O2It is the center of circle with R1- r2Intersect for the circle of radius with x-axis, it is r that radius is made in intersection as center2Transition circle (9), by the equal space line of prolate epicycloid (8) rotation alpha angle, it is tangent to obtain the equal space line (8) of transition circle (9) and prolate epicycloid, point of contact C, transition circle (9) and epicycloid Equal space line (6) it is tangent, point of contact D, obtain the equal space line BC of First Transition circular arc C D and prolate epicycloid;
Wherein, the anglec of rotation(xw, yw) be following bar curve intersection point:
It is the center of circle with R using O1-r1For the circle of radius:x2+y2=(R1-r1)2
Epicycloidal equal space line (6) pair-wise offset r laterally1The curve obtained afterwards, its equation are as follows:
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4. by the equal space line BC of prolate epicycloid obtained above, First Transition circular arc C D, epicycloidal equal space line DE and first Circular arc EF symmetrically obtains the equidistant curve KL of the second prolate epicycloid, the second transition arc JK, second epicycloidal on y-axis Equidistant curve IJ and the second circular arc HI.
4. a kind of complete smooth twin-screw liquid pump screw rotor as claimed in claim 1, it is characterized in that:Left screw rotor (701) axial screw expansion generation is made along left-hand screw line by left side molded line (501);Right screw rotor (702) is by right side type Line (502) makees axial screw expansion generation along right-hand helix;Spiral on left screw rotor (701) and right screw rotor (702) It can realize between the flank of tooth and all be smoothly connected, form complete smooth twin-screw liquid pump screw rotor;
Right-hand helix equation is:
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>x</mi> <mo>=</mo> <mi>R</mi> <mi> </mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>y</mi> <mo>=</mo> <mi>R</mi> <mi> </mi> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>z</mi> <mo>=</mo> <mfrac> <mi>p</mi> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> </mfrac> <mi>&amp;tau;</mi> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mn>0</mn> <mo>&lt;</mo> <mi>&amp;tau;</mi> <mo>&lt;</mo> <mn>2</mn> <mi>n</mi> <mi>&amp;pi;</mi> </mrow>
Left-hand screw line equation is:
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>x</mi> <mo>=</mo> <mi>R</mi> <mi> </mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>y</mi> <mo>=</mo> <mo>-</mo> <mi>R</mi> <mi> </mi> <mi>sin</mi> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>z</mi> <mo>=</mo> <mfrac> <mi>p</mi> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> </mrow> </mfrac> <mi>&amp;tau;</mi> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mn>0</mn> <mo>&lt;</mo> <mi>&amp;tau;</mi> <mo>&lt;</mo> <mn>2</mn> <mi>n</mi> <mi>&amp;pi;</mi> </mrow>
More than:R-helix radius, mm;P-screw rotor pitch, mm;τ-spiral the angle of spread, rad;N-pitch number.
5. a kind of complete smooth twin-screw liquid pump screw rotor according to claim 1, it is characterized in that:Left screw rod is turned Central angle β corresponding to addendum circle arc FGH in the left side molded line (501) of sub (701) is changed to 90-2 α, and tooth root circular arc LAB is corresponding Central angle be also changed to 90-2 α, obtain bidentate screw rotor side profile (401), side profile (401) is in pitch circle It is uniformly distributed on circumference by 180 °, just obtains complete bidentate screw rotor end face molded line (402).
6. a kind of twin-screw liquid pump, it is characterized in that:Screw rotor described in usage right requirement 1.
7. a kind of twin-screw liquid pump, it is characterized in that:Screw rotor described in usage right requirement 5.
CN201720524780.9U 2017-05-12 2017-05-12 A kind of complete smooth twin-screw liquid pump screw rotor Withdrawn - After Issue CN206694248U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107023480A (en) * 2017-05-12 2017-08-08 中国石油大学(华东) A kind of complete smooth twin-screw liquid pump screw rotor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107023480A (en) * 2017-05-12 2017-08-08 中国石油大学(华东) A kind of complete smooth twin-screw liquid pump screw rotor

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