CN207864160U  A kind of complete smooth screw rotor  Google Patents
A kind of complete smooth screw rotor Download PDFInfo
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 CN207864160U CN207864160U CN201820098574.0U CN201820098574U CN207864160U CN 207864160 U CN207864160 U CN 207864160U CN 201820098574 U CN201820098574 U CN 201820098574U CN 207864160 U CN207864160 U CN 207864160U
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 screw rotor
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 210000000078 Claw Anatomy 0.000 claims abstract description 29
 210000004746 Tooth Root Anatomy 0.000 claims abstract description 16
 239000000470 constituent Substances 0.000 claims abstract description 13
 239000011159 matrix material Substances 0.000 claims description 3
 230000001131 transforming Effects 0.000 claims description 3
 238000007789 sealing Methods 0.000 abstract 1
 230000000875 corresponding Effects 0.000 description 2
 238000000034 method Methods 0.000 description 2
 235000007926 Craterellus fallax Nutrition 0.000 description 1
 240000007175 Datura inoxia Species 0.000 description 1
 238000007906 compression Methods 0.000 description 1
 238000006073 displacement reaction Methods 0.000 description 1
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Abstract
The utility model discloses a kind of complete smooth screw rotor, the left section molded line of left screw rotor is identical with the shape of the right section molded line of right screw rotor and constituent curve；Left section molded line is made of the first junction curve, the conjugate curves of the first junction curve, left addendum circle arc, left claw point elliptic arc, left claw point elliptic arc envelope and left tooth root circular arc；Left section molded line includes two kinds of embodiments：When the first junction curve is sine curve, the conjugate curves of the first junction curve are sinusoidal envelope；When the first junction curve is sinusoidal envelope, the conjugate curves of the first junction curve are sine curve；Two complete correct engagements of screw rotor, connection is completely smooth between the adjacent flank of tooth, there is no region of stress concentrations, with larger area utilization, continuous and shorter space contact line, the smaller leakage triangle of area, improves the sealing performance of Twinscrew vacuum pump, improves final vacuum and rate of air sucked in required.
Description
Technical field
The utility model is related to Twinscrew vacuum pumps, more particularly to are suitable for a kind of complete smooth spiral shell of Twinscrew vacuum pump
Bar rotor.
Background technology
Twinscrew vacuum pump is a kind of rotary displacement pump, have it is simple in structure, operate steadily, clean oilfree, adaptation more
The advantages of kind of operating mode, the important spare part of Twinscrew vacuum pump are two parallel assembly, intermeshing screw rotors, when work
It is moved by the incorgruous dual AC power that synchronizes of two screw rotors, realizes airbreathing, compression and the exhaust process of pumped gas in pump；Spiral shell
Performance important of the section molded line of bar rotor to Twinscrew vacuum pump.
The section molded line of general screw rotor is made of 4 sections of curves at present, including tooth root circular arc, addendum circle arc, cycloid, circle
Involute, there is the part for being not involved in engagement in the section molded line of the screw rotor, and the space contact line of screw rotor is discontinuous；
Patent CN102465871A proposes a kind of screw rotor end face tooth type, constituent curve include cycloid, circular arc and arc envelope line,
Elliptic arc and oval envelope curve, the section molded line area utilization is low, and the screw rotor space contact line being generated by it is long；Patent
CN103032333A proposes a kind of Twinscrew vacuum pump molded lines of rotor, and pawl point is substituted using arc section at pawl point, and circular arc is total
Yoke envelope substitutes cycloid, and the screw rotor leakage triangle area which generates is excessive.
Invention content
In order to solve, existing Twinscrew vacuum pump screw rotor area utilization is low, space contact line is long, leakage triangle
The big problem of area, while the type of horn of plenty Twinscrew vacuum pump rotor, the utility model proposes a kind of complete smooth spiral shells
Bar rotor：Addendum circle arc and tooth root circular arc are smoothly connected using sine curve and its envelope, using elliptic arc and its envelope
Pawl point is corrected, the area utilization of section molded line is improved, reduces the leakage triangle area of screw rotor, and two screw rods
Rotor has continuous and shorter space contact line, be conducive to reduce operated adjacent chamber between by space contact line and leakage triangle
The leakage of shape improves the final vacuum and rate of air sucked in required of screw rotor.
To achieve the goals above, the utility model adopts the following technical solution：
A kind of complete smooth screw rotor, including left screw rotor (1) and right screw rotor (2), left screw rotor (1)
Left section molded line (101) is made of 6 sections of curves, is followed successively by counterclockwise：The first junction curve AB, the first junction curve
Conjugate curves BC, left addendum circle arc CD, left claw point elliptic arc DE, left claw point elliptic arc envelope EF, left tooth root circular arc FA are adjacent
Connection is completely smooth between constituent curve；The right section molded line (201) of right screw rotor (2) is made of 6 sections of curves, by counterclockwise
Direction is followed successively by：Second junction curve ab, the conjugate curves bc of the second junction curve, right addendum circle arc cd, right pawl point elliptic arc
De, right pawl point elliptic arc envelope ef, right tooth root circular arc fa are completely smooth connection between adjacent constituent curve；Left section molded line
(101) identical with the shape of right section molded line (201) and constituent curve；In the work for synchronizing incorgruous dual AC power movement,
Left section molded line (101) is with the situation that engages of the upper each section of curve of right section molded line (201)：First junction curve AB and second connects
The conjugate curves bc engagements of curve are connect, the conjugate curves BC of the first junction curve is engaged with the second junction curve ab, left outside circle
Arc CD is engaged with right tooth root circular arc fa, and left claw point elliptic arc DE is engaged with right pawl point elliptic arc envelope ef, left claw point elliptic arc
Envelope EF is engaged with right pawl point elliptic arc de, and left tooth root circular arc FA is engaged with right addendum circle arc cd；Left section molded line (101)
The conjugate curves BC of first junction curve AB and the first junction curve includes two kinds of embodiments：When the first junction curve AB is sine
When curve, the conjugate curves BC of the first junction curve is sinusoidal envelope；When the first junction curve AB is sine curve
Envelope when, the conjugate curves BC of the first junction curve is sine curve.
A kind of described complete smooth screw rotor, the first connection in first embodiment on left section molded line (101) are bent
Line AB is designed to that sine curve, the conjugate curves BC of the first junction curve are designed to sinusoidal envelope, and curvilinear equation is such as
Under：
Molded line parameter includes：Pitch radius R_{2}, fillet radius R_{3}, back of tooth central angle θ, the first angular frequency_{1}；
The equation of first junction curve AB is：
In formula：α=pi/2θ/2；
The equation of the conjugate curves BC of first junction curve is：
In formula,For the first intermediate parameters, acquired by following formula：
C_{1}、C_{2}、C_{3}、C_{4}For constant.
A kind of described complete smooth screw rotor, the first connection in second embodiment on left section molded line (101) are bent
Line AB is designed to that sinusoidal envelope, the conjugate curves BC of the first junction curve are designed to sine curve, and curvilinear equation is such as
Under：
Molded line parameter includes：Addendum circle arc radius R_{1}, pitch radius R_{2}, back of tooth central angle θ, the second angular frequency_{2}；
The equation of the conjugate curves BC of first junction curve is：
In formula：α=pi/2θ/2；
The equation of first junction curve AB is：
In formula,For the second intermediate parameters, acquired by following formula：
C_{5}、C_{6}、C_{7}、C_{8}For constant.
A kind of complete smooth screw rotor, the constituent curve of the left section molded line (101) of left screw rotor (1) are left
The curvilinear equation of pawl point elliptic arc DE and left claw point elliptic arc envelope EF are as follows：
Molded line parameter includes：Addendum circle arc radius R_{1}, pitch radius R_{2}, elliptic arc major semiaxis m, elliptic arc semiminor axis n, rotation
Gyration γ；
The equation of left claw point elliptic arc DE is：
The equation of left claw point elliptic arc envelope EF is：
In formula：M_{1}For rotational transformation matrix,For initial pawl point elliptic arc envelope：
M_{1}It indicates initial pawl point elliptic arc envelope around left section molded line center O_{1}Rotation γ angles counterclockwise, rotation angle
Degree γ is determined by following equation：
In formula：For third intermediate parameters, byIt asks
, C_{9}、C_{10}、C_{11}、C_{12}For constant.
A kind of Twinscrew vacuum pump uses a kind of complete smooth screw rotor.
The beneficial effects of the utility model are：
(1) it is completely smooth connection between all adjacent curves on the section molded line of the screw rotor proposed, by section
The expansion of molded line spiral generates complete smooth screw rotor, is completely smooth connection between the adjacent flank of tooth, region of stress concentration is not present,
Improve the mechanical property of screw rotor；
(2) screw rotor proposed is compared with existing screw rotor, the area utilization with bigger, continuously and more
The smaller leakage triangle of short space contact line and area；Be conducive to contact by space between reduction operated adjacent chamber
The leakage of line and leakage triangle improves the final vacuum and rate of air sucked in required of screw rotor.
Description of the drawings
Fig. 1 is the left section molded lines of the left screw rotor of first embodiment.
Fig. 2 is the left section molded lines of the left screw rotor of second embodiment.
Fig. 3 is the pawl point elliptic arc figure of left section molded line.
Fig. 4 is the engagement figure of first embodiment left section molded line and right section molded line.
Fig. 5 is the engagement line chart of first embodiment two screw rods rotor.
Fig. 6 is the space contact line figure on the left screw rotor of first embodiment.
Fig. 7 is the engagement figure of first embodiment two screw rods rotor.
In figure：1left screw rotor；2right screw rotors；101left section molded line；201right section molded line；R_{1}—
Addendum circle arc radius；R_{2} pitch radius；R_{3} fillet radius；Melliptic arc major semiaxis；Nelliptic arc semiminor axis；θ—
Back of tooth central angle；γrotation angle；O_{1} left section molded line center；O_{2} right section molded line center；O_{t}Inpawl point elliptic arc
The heart；l_{AB} the first back of tooth path of contact；l_{BC} the second back of tooth path of contact；l_{CD} outside circle path of contact；l_{DE} crown path of contact；
l_{EF} concave tooth path of contact；l_{FA} root circle path of contact；L_{AB} the first rear flank contact line；L_{BC} the second rear flank contact line；
L_{CD} crest top land contact line；L_{DE} face of tooth contact line；L_{EF} concave tooth face contact line；L_{FA} root face contact line.
Specific implementation mode
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the left section molded line (101) of the left screw rotor of first embodiment (1) is made of 6 sections of curves, by inverse
Clockwise is followed successively by：First junction curve AB, the conjugate curves BC of the first junction curve, left addendum circle arc CD, left claw point are ellipse
Circular arc DE, left claw point elliptic arc envelope EF, left tooth root circular arc FA are completely smooth connection between adjacent constituent curve；First connects
It meets curve AB and is designed to that sine curve, the conjugate curves BC of the first junction curve are designed to sinusoidal envelope, curve side
Journey is as follows：
Molded line parameter includes：Pitch radius R_{2}, fillet radius R_{3}, back of tooth central angle θ, the first angular frequency_{1}；
The equation of first junction curve AB is：
In formula：α=pi/2θ/2；
The equation of the conjugate curves BC of first junction curve is：
In formula,For the first intermediate parameters, acquired by following formula：
C_{1}、C_{2}、C_{3}、C_{4}For constant.
As shown in Fig. 2, the left section molded line (101) of the left screw rotor of second embodiment (1) is made of 6 sections of curves, by inverse
Clockwise is followed successively by：First junction curve AB, the conjugate curves BC of the first junction curve, left addendum circle arc CD, left claw point are ellipse
Circular arc DE, left claw point elliptic arc envelope EF, left tooth root circular arc FA are completely smooth connection between adjacent constituent curve；First connects
It meets curve AB and is designed to that sinusoidal envelope, the conjugate curves BC of the first junction curve are designed to sine curve, curve side
Journey is as follows：
Molded line parameter includes：Addendum circle arc radius R_{1}, pitch radius R_{2}, back of tooth central angle θ, the second angular frequency_{2}；
The equation of the conjugate curves BC of first junction curve is：
In formula：α=pi/2θ/2；
The equation of first junction curve AB is：
In formula,For the second intermediate parameters, acquired by following formula：
C_{5}、C_{6}、C_{7}、C_{8}For constant.
As shown in figure 3, the centers left claw point elliptic arc DE of left section molded line (101) are pawl point elliptic arc center O_{t}, O_{t}D connects
Line is elliptic arc semiminor axis, is rotation angle γ with horizontal direction angle；Left claw point elliptic arc DE and left claw point elliptic arc envelope
The curvilinear equation of line EF is as follows：
The equation of left claw point elliptic arc DE is：
The equation of left claw point elliptic arc envelope EF is：
In formula：M_{1}For rotational transformation matrix,For initial pawl point elliptic arc envelope：
M_{1}It indicates initial pawl point elliptic arc envelope around left section molded line center O_{1}Rotation γ angles counterclockwise, rotation angle
Degree γ is determined by following equation：
In formula：For third intermediate parameters, byIt asks
, C_{9}、C_{10}、C_{11}、C_{12}For constant.
As shown in figure 4, left section molded line (101) is identical with the shape of right section molded line (201) and constituent curve；
In the work for synchronizing incorgruous dual AC power movement, left section molded line (101) engages feelings with the upper each section of curve of right section molded line (201)
Condition is：First junction curve AB is engaged with the conjugate curves bc of the second junction curve, the conjugate curves BC of the first junction curve with
Second junction curve ab engagements, left addendum circle arc CD are engaged with right tooth root circular arc fa, and left claw point elliptic arc DE is oval with right pawl point
The ef engagements of arc envelope, left claw point elliptic arc envelope EF are engaged with right pawl point elliptic arc de, left tooth root circular arc FA and right tooth top
Circular arc cd engagements.
As shown in figure 5, for the engagement line chart of first embodiment two screw rods rotor.First on left section molded line (101) connects
It meets curve AB to be meshed with the conjugate curves bc of the second junction curve on right section molded line (201), path of contact is the first tooth
Carry on the back path of contact l_{AB}；The conjugate curves BC of the first junction curve on left section molded line (101) and the on right section molded line (201)
Two junction curve ab are meshed, and path of contact is the second back of tooth path of contact l_{BC}；Left addendum circle arc CD on left section molded line (101)
It is meshed with the right tooth root circular arc fa on right section molded line (201), path of contact is outside circle path of contact l_{CD}；Left section molded line
(101) the left claw point elliptic arc DE on is meshed with the right pawl point elliptic arc envelope ef on right section molded line (201), engagement
Line is crown path of contact l_{DE}；On left claw point elliptic arc envelope EF and right section molded line (201) on left section molded line (101)
Right pawl point elliptic arc de is meshed, and path of contact is concave tooth path of contact l_{EF}；Left tooth root circular arc FA on left section molded line (101) with
Right addendum circle arc cd on right section molded line (201) is meshed, and path of contact is root circle path of contact l_{FA}；Two screw rods rotor has
Continuous path of contact.
As shown in fig. 6, for the space contact line figure on the left screw rotor of first embodiment (1).First rear flank contact line
L_{AB}It is projected as the first back of tooth path of contact l in screw rotor section_{AB}；Second rear flank contact line L_{BC}In screw rotor section
It is projected as the second back of tooth path of contact l_{BC}；Crest top land contact line L_{CD}It is projected as outside circle path of contact l in screw rotor section_{CD}；Tooth
Sharp face contact line L_{DE}It is projected as crown path of contact l in screw rotor section_{DE}；Concave tooth face contact line L_{EF}In screw rotor section
Be projected as concave tooth path of contact l_{EF}；Root face contact line L_{FA}It is projected as root circle path of contact l in screw rotor section_{FA}；Screw rod
The space contact line of rotor is continuous and shorter, can effectively reduce operated adjacent intracavity gas letting out by space contact line
Leakage, and then improve the interstage seal performance of Twinscrew vacuum pump.
As shown in fig. 7, for the engagement figure of first embodiment two screw rods rotor.Left screw rotor (1) and right screw rotor (2)
It is unfolded to generate along the axis spiral of two screw rotors by corresponding section molded line respectively, is completely smooth between the adjacent flank of tooth
Connection；When two screw rotors synchronize incorgruous dual AC power movement, the at a fully engaged of the corresponding flank of tooth can be met, there is no interference
Or have neither part nor lot in the part of engagement.
It is abovementioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but not to this practicality newly
The limitation of type protection domain, those skilled in the art should understand that, based on the technical solution of the present invention, ability
Field technique personnel need not make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (5)
1. a kind of complete smooth screw rotor, including left screw rotor (1) and right screw rotor (2), it is characterized in that：Left screw rod turns
The left section molded line (101) of sub (1) is made of 6 sections of curves, is followed successively by counterclockwise：First junction curve AB, first connect
Connect conjugate curves BC, left addendum circle arc CD, left claw point elliptic arc DE, left claw point elliptic arc envelope EF, the left root circle of curve
Arc FA is completely smooth connection between adjacent constituent curve；The right section molded line (201) of right screw rotor (2) is by 6 sections of curve groups
At being followed successively by counterclockwise：Second junction curve ab, the conjugate curves bc of the second junction curve, right addendum circle arc cd, the right side
Pawl point elliptic arc de, right pawl point elliptic arc envelope ef, right tooth root circular arc fa are completely smooth connection between adjacent constituent curve；
Left section molded line (101) is identical with the shape of right section molded line (201) and constituent curve；Synchronizing incorgruous dual AC power movement
Work in, left section molded line (101) is with the situation that engages of the upper each section of curve of right section molded line (201)：First junction curve
AB is engaged with the conjugate curves bc of the second junction curve, and the conjugate curves BC of the first junction curve is nibbled with the second junction curve ab
It closes, left addendum circle arc CD is engaged with right tooth root circular arc fa, and left claw point elliptic arc DE is engaged with right pawl point elliptic arc envelope ef, left
Pawl point elliptic arc envelope EF is engaged with right pawl point elliptic arc de, and left tooth root circular arc FA is engaged with right addendum circle arc cd；Left section
First junction curve AB of molded line (101) and the conjugate curves BC of the first junction curve includes two kinds of embodiments：When the first connection
When curve AB is sine curve, the conjugate curves BC of the first junction curve is sinusoidal envelope；When the first junction curve
When AB is sinusoidal envelope, the conjugate curves BC of the first junction curve is sine curve.
2. a kind of complete smooth screw rotor as described in claim 1, it is characterized in that：Left section molded line in first embodiment
(101) the first junction curve AB on is designed to that sine curve, the conjugate curves BC of the first junction curve are designed to sine curve
Envelope, curvilinear equation is as follows：
Molded line parameter includes：Pitch radius R_{2}, fillet radius R_{3}, back of tooth central angle θ, the first angular frequency_{1}；
The equation of first junction curve AB is：
In formula：α=pi/2θ/2；
The equation of the conjugate curves BC of first junction curve is：
In formula,For the first intermediate parameters, acquired by following formula：
C_{1}、C_{2}、C_{3}、C_{4}For constant.
3. a kind of complete smooth screw rotor as described in claim 1, it is characterized in that：Left section molded line in second embodiment
(101) the first junction curve AB on is designed to that sinusoidal envelope, the conjugate curves BC of the first junction curve are designed to
Sine curve, curvilinear equation are as follows：
Molded line parameter includes：Addendum circle arc radius R_{1}, pitch radius R_{2}, back of tooth central angle θ, the second angular frequency_{2}；
The equation of the conjugate curves BC of first junction curve is：
In formula：α=pi/2θ/2；
The equation of first junction curve AB is：
In formula,For the second intermediate parameters, acquired by following formula：
C_{5}、C_{6}、C_{7}、C_{8}For constant.
4. a kind of complete smooth screw rotor as described in claim 1, it is characterized in that：The left section type of left screw rotor (1)
The curvilinear equation of the constituent curve left claw point elliptic arc DE and left claw point elliptic arc envelope EF of line (101) are as follows：
Molded line parameter includes：Addendum circle arc radius R_{1}, pitch radius R_{2}, elliptic arc major semiaxis m, elliptic arc semiminor axis n, rotation angle
Spend γ；
The equation of left claw point elliptic arc DE is：
The equation of left claw point elliptic arc envelope EF is：
In formula：M_{1}For rotational transformation matrix,For initial pawl point elliptic arc envelope：
M_{1}It indicates initial pawl point elliptic arc envelope around left section molded line center O_{1}Rotation γ angles counterclockwise, rotation angle γ
It is determined by following equation：
In formula：For third intermediate parameters, byIt asks
, C_{9}、C_{10}、C_{11}、C_{12}For constant.
5. a kind of Twinscrew vacuum pump, it is characterized in that：Use a kind of complete smooth screw rotor as described in claim 1.
Priority Applications (1)
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CN201820098574.0U CN207864160U (en)  20180122  20180122  A kind of complete smooth screw rotor 
Applications Claiming Priority (1)
Application Number  Priority Date  Filing Date  Title 

CN201820098574.0U CN207864160U (en)  20180122  20180122  A kind of complete smooth screw rotor 
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Cited By (1)
Publication number  Priority date  Publication date  Assignee  Title 

CN111350665A (en) *  20200225  20200630  宁波鲍斯能源装备股份有限公司  Screw rotor set and hydrogen circulating pump with same 

2018
 20180122 CN CN201820098574.0U patent/CN207864160U/en active Active
Cited By (2)
Publication number  Priority date  Publication date  Assignee  Title 

CN111350665A (en) *  20200225  20200630  宁波鲍斯能源装备股份有限公司  Screw rotor set and hydrogen circulating pump with same 
CN111350665B (en) *  20200225  20220218  宁波鲍斯能源装备股份有限公司  Screw rotor set and hydrogen circulating pump with same 
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