CN102022335B - Rotor profiles of screw compressors - Google Patents

Rotor profiles of screw compressors Download PDF

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Publication number
CN102022335B
CN102022335B CN 201010607302 CN201010607302A CN102022335B CN 102022335 B CN102022335 B CN 102022335B CN 201010607302 CN201010607302 CN 201010607302 CN 201010607302 A CN201010607302 A CN 201010607302A CN 102022335 B CN102022335 B CN 102022335B
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rotor
section
circular arc
point
angle
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CN102022335A (en
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张玉新
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Jiangsu Gao Tai Auto Parts Co. Ltd.
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SHANGHAI NAIPU FLUID MACHINERY TECHNOLOGY Co Ltd
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Abstract

The invention relates to rotor profiles of screw compressors. The rotor profiles are characterized in that nine curves are respectively adopted to form rotor end face profiles with two asymmetrical sides; and the rotors with the same center distance A and different head numbers form the profile series of two rotors of the screw compressors. The rotor profiles are novel multi-head conjugate rotor end face profiles which are also called self-conjugate profiles, and the profiles comprise circular arcs and envelope curves. The two rotors, namely a female rotor and a male rotor are identical, wherein each rotor takes the pitch circle as the boundary, the crest part plays a role of the male rotor, the root part plays a role of the female rotor, and the functions of the female and male rotors are integrated. The screw compressors applying the rotor profiles can be widely applied in the fields such as air compression, refrigeration, air conditioning, process gas compression and the like, and hold most shares of the market under the working conditions of middle and low pressure.

Description

Molded lines of rotor of helical lobe compressor
Technical field
The present invention relates to helical-lobe compressor, relate in particular to a kind of screw rotor molded lines that is applicable to helical-lobe compressor.
Background technique
The quality of screw compressor end face molded lines is with directly having influence on the performance of helical-lobe compressor, as sealing, efficient, area utilization factor etc.Popular in the market molded lines has GHH molded lines, Hitachi's molded lines, SRM molded lines etc., and they have characteristics separately, but also exists separately independently problem.
Summary of the invention
The present invention is on the basis of drawing domestic and international existing helical-lobe compressor molded lines advantage, develops a kind of molded lines of rotor of helical lobe compressor, and it is a kind of novel molded lines of rotor of helical lobe compressor, has solved above-mentioned existing in prior technology problem.
Technical solution of the present invention is as follows:
A kind of molded lines of rotor of helical lobe compressor adopts nine sections curves to form the rotor end-face molded lines respectively, constitutes the molded lines series of two rotors of helical-lobe compressor with the rotor of identical centre distance A and different numbers;
Wherein the molded lines of the first rotor is composed as follows:
a 1b 1Section: on second rotor, circular arc a 2b 2The arc envelope line that generates;
b 1c 1The section: on second rotor, circular arc or etc. variable angle spiral b 2c 2The helix envelope that generates;
c 1d 1Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to formula:
Wherein: the curve angle is got
Figure DEST_PATH_943992DEST_PATH_IMAGE002
C on the curve 2The laying angle of point
Figure DEST_PATH_723729DEST_PATH_IMAGE003
D on the curve 2The laying angle of point
With pitch circle and center line O 1O 2Intersection point c 1Be starting point, R 2jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 1d 1Variable angle spirals such as section;
d 1e 1Section: on the first rotor, be cut in tooth top arc e 1f 1Section and c 2d 2The circular arc of section;
e 1f 1Section: on the first rotor, with O 1Centered by the point, R 10Tooth top arc for radius;
f 1g 1Section: on the first rotor, be cut in tooth top arc e 1f 1The circular arc of section;
g 1h 1Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to above-mentioned formula;
Wherein: the curve angle is got
B on the curve 1The laying angle of point
Figure DEST_PATH_568823DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure DEST_PATH_835856DEST_PATH_IMAGE004
With pitch circle and mistake O 1, angle is α 1=π/z 1The intersection point h of ray 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get g 1h 1Variable angle spirals such as section;
h 1i 1The section: on second rotor, circular arc or etc. variable angle spiral h 2i 2The circular arc or the helix envelope that generate;
i 1j 1Section: on second rotor, circular arc i 2j 2The arc envelope line that generates;
Wherein the molded lines of second rotor is composed as follows:
a 2b 2Section: on second rotor, be cut in the circular arc of tooth top arc;
b 2c 2Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to formula:
Figure DEST_PATH_83797DEST_PATH_IMAGE002
Wherein: the curve angle is got
Figure DEST_PATH_765952DEST_PATH_IMAGE002
C on the curve 1The laying angle of point
Figure DEST_PATH_759316DEST_PATH_IMAGE003
D on the curve 1The laying angle of point
With pitch circle and center line O 1O 2Intersection point c 2Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 1d 1Variable angle spirals such as section;
c 2d 2The section: on the first rotor, circular arc or etc. variable angle spiral c 1d 1The circular arc or the helix envelope that generate;
d 2e 2Section: on the first rotor, circular arc d 1e 1The arc envelope line that generates;
e 2f 2Section: on second rotor, with O 2Centered by the point, R 2Tooth root arc for radius;
f 2g 2Section: on the first rotor, circular arc f 1g 1The arc envelope line that generates;
g 2h 2The section: on the first rotor, circular arc or etc. variable angle spiral g 1h 1The circular arc or the helix envelope that generate;
h 2i 2The section: on second rotor, circular arc or etc. variable angle spiral, wait variable angle spiral according to above-mentioned formula;
Wherein: the curve angle is got
Figure DEST_PATH_657182DEST_PATH_IMAGE005
B on the curve 1The laying angle of point
Figure DEST_PATH_649408DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure DEST_PATH_79253DEST_PATH_IMAGE004
With pitch circle and mistake O 2, angle is α 2=π/z 1The intersection point h of ray 2Be starting point, R 2jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get h 2i 2Variable angle spirals such as section.
Described rotor end-face molded lines is bilateral asymmetric molded lines.
The end face molded lines of described the first rotor is by a 1b 1, b 1c 1, c 1d 1, d 1e 1, e 1f 1, f 1g 1, g 1h 1, h 1i 1, i 1j 1Nine sections curves are formed.
The end face molded lines of described second rotor is by a 2b 2, b 2c 2, c 2d 2, d 2e 2, e 2f 2, f 2g 2, g 2h 2, h 2i 2, i 2j 2Nine sections curves are formed.
Described the first rotor forms conjugate relation with the corresponding curve of the second rotor end-face molded lines.
Described the first rotor and second rotor are identical, adopt left-handed respectively and dextrorotation formation meshing relation.
Molded lines of rotor of helical lobe compressor of the present invention adopts a kind of novel bull conjugation rotor end-face molded lines, also claims the self-conjugate molded lines, and molded lines is made up of circular arc and envelope thereof, and its main feature is as follows:
1, two rotors of the present invention are that female rotor, male rotor are identical.Each rotor is the boundary with the pitch circle, and tooth top partly plays the effect of male rotor, and tooth root partly plays the effect of female rotor, and the function of yin, yang rotor is integrated.
2, rotor end-face molded lines of the present invention is bilateral asymmetric molded lines.
3, the end face molded lines of the first rotor in two rotors of the present invention is by a 1b 1, b 1c 1, c 1d 1, d 1e 1, e 1f 1, f 1g 1, g 1h 1, h 1i 1, i 1j 1Form Deng nine sections curves, and with nine sections corresponding curve a of the end face molded lines of second rotor 2b 2, b 2c 2, c 2d 2, d 2e 2, e 2f 2, f 2g 2, g 2h 2, h 2i 2, i 2j 2Form conjugate relation.
Because two rotors are identical, so just adopt left-handed and dextrorotation respectively, can form meshing relation.
The centre distance of two rotor end-face molded lines is A, and the first rotor number of teeth is z 1, the second rotor number of teeth is z 2, select z- 1, z 2The principle of institute's foundation is: to being used for the helical-lobe compressor of low pressure operating mode, z 1/ z 2Desirable 3/3,4/4 molded lines; To being used for the helical-lobe compressor of middle and high pressure operating mode, z 1/ z 2Desirable 5/5,6/6,7/7,8/8 molded lines.Then, can determine the radius R of the first rotor and the second rotor pitch circle 1j=R 2j, the principle of institute's foundation is: R 1j=R 2j=A/2.
Use the helical-lobe compressor of molded lines of rotor of helical lobe compressor of the present invention, can be widely used in fields such as air compression, refrigeration, air-conditioning, process gas compression, under the mesolow operating mode, occupy most market shares.
Description of drawings
Fig. 1 is the structural representation of a kind of molded lines of rotor of helical lobe compressor of the present invention.
Embodiment
Elaborate below in conjunction with the structure of drawings and Examples to rotor of helical lobe compressor end face molded lines of the present invention.
Referring to Fig. 1, the invention provides a kind of molded lines of rotor of helical lobe compressor, adopt nine sections curves to form the rotor end-face molded lines respectively.Constitute the molded lines series of two rotors of helical-lobe compressor with the rotor of identical centre distance A and different numbers.The molded lines of the first rotor 1 and second rotor 2 is composed as follows:
R 1Be the root radius of the first rotor, R 10It is the Outside radius of the first rotor.
R 2Be the root radius of second rotor, R 20It is the Outside radius of second rotor.
R 1=R 2, R 10=R 20, pitch circle R 1j=R 2j=(R 1+ R 10)/2.
c 1, h 1Put on the first rotor pitch circle c 2, h 2O'clock on the second rotor pitch circle.
The molded lines of the first rotor is composed as follows:
a 1b 1Section: on second rotor, circular arc a 2b 2The arc envelope line that generates.
b 1c 1The section: on second rotor, circular arc or etc. variable angle spiral b 2c 2The helix envelope that generates.
c 1d 1Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to formula:
Figure DEST_PATH_674310DEST_PATH_IMAGE002
Wherein: the curve angle is got
Figure 937280DEST_PATH_IMAGE002
C on the curve 1The laying angle of point
Figure 49592DEST_PATH_IMAGE003
D on the curve 1The laying angle of point
Figure 978234DEST_PATH_IMAGE004
With pitch circle and center line O 1O 2Intersection point c 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 1d 1Variable angle spirals such as section.
d 1e 1Section: on the first rotor, be cut in tooth top arc e 1f 1Section and c 1d 1The circular arc of section.
e 1f 1Section: on the first rotor, with O 1Centered by the point, R 10Tooth top arc for radius.
f 1g 1Section: on the first rotor, be cut in tooth top arc e 1f 1The circular arc of section.
g 1h 1Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to above-mentioned formula.
Wherein: the curve angle is got
Figure 707156DEST_PATH_IMAGE005
B on the curve 1The laying angle of point
Figure 254812DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure 752789DEST_PATH_IMAGE004
With pitch circle and mistake O 1, angle is α 1=π/z 1The intersection point h of ray 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get g 1h 1Variable angle spirals such as section.
h 1i 1The section: on second rotor, circular arc or etc. variable angle spiral h 2i 2The circular arc or the helix envelope that generate.
i 1j 1Section: on second rotor, circular arc i 2j 2The arc envelope line that generates.
The molded lines of second rotor is composed as follows:
a 2b 2Section: on second rotor, be cut in the circular arc of tooth top arc.
b 2c 2Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to formula:
Figure DEST_PATH_154970DEST_PATH_IMAGE002
Wherein: the curve angle is got
Figure DEST_PATH_819282DEST_PATH_IMAGE002
C on the curve 2The laying angle of point
D on the curve 2The laying angle of point
Figure DEST_PATH_523113DEST_PATH_IMAGE004
With pitch circle and center line O 1O 2Intersection point c 2Be starting point, R 2jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 2d 2Variable angle spirals such as section.
c 2d 2The section: on the first rotor, circular arc or etc. variable angle spiral c 1d 1The circular arc or the helix envelope that generate.
d 2e 2Section: on the first rotor, circular arc d 1e 1The arc envelope line that generates.
e 2f 2Section: on second rotor, with O 2Centered by the point, R 2Tooth root arc for radius.
f 2g 2Section: on the first rotor, circular arc f 1g 1The arc envelope line that generates.
g 2h 2The section: on the first rotor, circular arc or etc. variable angle spiral g 1h 1The circular arc or the helix envelope that generate.
h 2i 2The section: on second rotor, circular arc or etc. variable angle spiral, wait variable angle spiral according to above-mentioned formula.
Wherein: the curve angle is got
Figure 59137DEST_PATH_IMAGE005
B on the curve 1The laying angle of point
Figure 497071DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure 386530DEST_PATH_IMAGE004
With pitch circle and mistake O 2, angle is α 2=π/z 1The intersection point h of ray 2Be starting point, R 2jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get h 2i 2Variable angle spirals such as section.
Molded lines of rotor of helical lobe compressor of the present invention concrete building process in actual applications is as follows:
According to Fig. 1, the molded lines line segment of the first rotor is by a 1b 1, b 1c 1, c 1d 1, d 1e 1, e 1f 1, f 1g 1, g 1h 1, h 1i 1, i 1j 1Nine sections compositions, the molded lines line segment of second rotor is by a 2b 2, b 2c 2, c 2d 2, d 2e 2, e 2f 2, f 2g 2, g 2h 2, h 2i 2, i 2j 2Nine sections compositions.
(1) makes up generation curve c at the first rotor 1d 1, g 1h 1, d 1e 1, e 1f 1, f 1g 1
c 1d 1Section: according to waiting variable angle spiral formula:
Figure DEST_PATH_322777DEST_PATH_IMAGE002
Wherein: the curve angle is got
Figure 316757DEST_PATH_IMAGE002
C on the curve 1The laying angle of point
Figure 710829DEST_PATH_IMAGE003
D on the curve 1The laying angle of point
Figure 935137DEST_PATH_IMAGE004
With pitch circle and center line O 1O 2Intersection point c 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 1d 1Variable angle spirals such as section.
g 1h 1Section: according to the above-mentioned variable angle spiral formula that waits.
Wherein: the curve angle is got
Figure 590109DEST_PATH_IMAGE005
B on the curve 1The laying angle of point
Figure 874460DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure 755828DEST_PATH_IMAGE004
With pitch circle and mistake O 1, angle is α 1The intersection point h of ray 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get g 1h 1Variable angle spirals such as section.
d 1e 1Section: be cut in tooth top arc and c outward 1d 1The circular arc of variable angle spirals such as section, radius R=3 ~ 5.
e 1f 1Section: centered by O1, R10 is the tooth top arc of radius, circular arc angle=1 ° ~ 5 °.
f 1g 1Section: be cut in tooth top arc and g outward 1h 1The circular arc of variable angle spirals such as section, radius R=1 ~ 3.
(2) the first rotor pitch circle is done pure rolling at the second rotor pitch circle, the spin velocity of the first rotor pitch circle ratio of tarnsition velocity together is 1:1, is cemented in variable angle spiral such as grade and circular arc c on the first rotor 1d 1, d 1e 1, e 1f 1, f 1g 1, g 1h 1Track, can form the helix of second rotor and the envelope c of circular arc 2d 2, d 2e 2, e 2f 2, f 2g 2, g 2h 2
(3) with the helix of second rotor and the envelope c of circular arc 2d 2, d 2e 2, copy on the first rotor according to corresponding relation, can get b 1c 1Section, ,a 1b 1Section.With the helix of second rotor and the envelope f of circular arc 2g 2, g 2h 2, copy on the first rotor according to corresponding relation, can get h 1i 1Section, i 1j 1Section, so far, complete monodentate end face molded lines on the first rotor is just built fully.
(4) with the monodentate end face molded lines on the first rotor along center O 1Uniform, can obtain the end face molded lines of the first rotor.
(5) with the end face molded lines of the first rotor from O 1Correspondence copies to O 2, then along O 2, rotation π/z 1, can obtain the end face molded lines of the second corresponding rotor.
So far, the first rotor, the second rotor end-face molded lines have just been built fully.
In sum, a kind of molded lines of rotor of helical lobe compressor of the present invention adopts bull conjugation rotor end-face molded lines, also claims the self-conjugate molded lines, and molded lines is made up of circular arc and envelope thereof, is bilateral asymmetric molded lines.Two rotors of the present invention are that female rotor, male rotor are identical, and each rotor is the boundary with the pitch circle, and tooth top partly plays the effect of male rotor, and tooth root partly plays the effect of female rotor, and the function of yin, yang rotor is integrated.Use the helical-lobe compressor of molded lines of rotor of helical lobe compressor of the present invention, can be widely used in fields such as air compression, refrigeration, air-conditioning, process gas compression, under the mesolow operating mode, occupy most market shares.
Certainly, those skilled in the art in the art will be appreciated that, above-described embodiment only is that the present invention is described, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention the variation of above-described embodiment, modification etc.

Claims (4)

1. a rotor of helical lobe compressor is characterized in that, adopts nine sections curves to form the rotor end-face molded lines respectively, constitutes the molded lines series of two rotors of helical-lobe compressor with the rotor of identical centre distance A and different numbers;
Described the first rotor forms conjugate relation with the corresponding curve of the second rotor end-face molded lines;
Wherein: the radius of the first rotor pitch circle is R 1j, the radius of the second rotor pitch circle is R 2jThe first rotor number of teeth is z 1, the second rotor number of teeth is z 2R 10Be the Outside radius of the first rotor, R 2It is the root radius of second rotor;
Wherein the molded lines of the first rotor is composed as follows:
a 1b 1Section: on second rotor, circular arc a 2b 2The arc envelope line that generates;
b 1c 1The section: on second rotor, circular arc or etc. variable angle spiral b 2c 2The helix envelope that generates;
c 1d 1Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to formula:
Figure 2010106073027100001DEST_PATH_IMAGE001
Wherein: the curve angle is got
C on the curve 1The laying angle of point
Figure 2010106073027100001DEST_PATH_IMAGE003
D on the curve 1The laying angle of point
With pitch circle and center line O 1O 2Intersection point c 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 1d 1Variable angle spirals such as section;
d 1e 1Section: on the first rotor, be cut in tooth top arc e 1f 1Section and c 1d 1The circular arc of section;
e 1f 1Section: on the first rotor, with O 1Centered by the point, R 10Tooth top arc for radius;
f 1g 1Section: on the first rotor, be cut in tooth top arc e 1f 1The circular arc of section;
g 1h 1Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to above-mentioned formula;
Wherein: the curve angle is got
Figure 2010106073027100001DEST_PATH_IMAGE005
B on the curve 1The laying angle of point
Figure 739082DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure 306461DEST_PATH_IMAGE004
With pitch circle and mistake O 1, angle is α 1=π/z 1The intersection point h of ray 1Be starting point, R 1jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get g 1h 1Variable angle spirals such as section;
h 1i 1The section: on second rotor, circular arc or etc. variable angle spiral h 2i 2The circular arc or the helix envelope that generate;
i 1j 1Section: on second rotor, circular arc i 2j 2The arc envelope line that generates;
Wherein the molded lines of second rotor is composed as follows:
a 2b 2Section: on second rotor, be cut in the circular arc of tooth top arc;
b 2c 2Section: adopt circular arc or etc. variable angle spiral, wait variable angle spiral according to formula:
Figure 2010106073027100001DEST_PATH_IMAGE007
Wherein: the curve angle is got
Figure 918839DEST_PATH_IMAGE002
C on the curve 2The laying angle of point
Figure 504541DEST_PATH_IMAGE003
D on the curve 2The laying angle of point
Figure 747435DEST_PATH_IMAGE004
With pitch circle and center line O 1O 2Intersection point c 2Be starting point, R 2jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get c 2d 2The section circular arc or etc. variable angle spiral;
c 2d 2The section: on the first rotor, circular arc or etc. variable angle spiral c 1d 1The circular arc or the helix envelope that generate;
d 2e 2Section: on the first rotor, circular arc d 1e 1The arc envelope line that generates;
e 2f 2Section: on second rotor, with O 2Centered by the point, R 2Tooth root arc for radius;
f 2g 2Section: on the first rotor, circular arc f 1g 1The arc envelope line that generates;
g 2h 2The section: on the first rotor, circular arc or etc. variable angle spiral g 1h 1The circular arc or the helix envelope that generate;
h 2i 2The section: on second rotor, circular arc or etc. variable angle spiral, wait variable angle spiral according to above-mentioned formula;
Wherein: the curve angle is got
Figure 51377DEST_PATH_IMAGE005
B on the curve 1The laying angle of point
Figure 139550DEST_PATH_IMAGE006
C on the curve 1The laying angle of point
Figure 783021DEST_PATH_IMAGE004
With pitch circle and mistake O 2, angle is α 2=π/z 1The intersection point h of ray 2Be starting point, R 2jBeing initiated with radius, by above-mentioned formula, is variable with θ, calculates each point, and smooth connection, can get h 2i 2Variable angle spirals such as section;
i 2j 2Section: on second rotor, circular arc i 2j 2Generate arc envelope line.
2. rotor of helical lobe compressor according to claim 1 is characterized in that, described the first rotor and the described second rotor end-face molded lines are bilateral asymmetric molded lines.
3. rotor of helical lobe compressor according to claim 1 is characterized in that, the end face molded lines of described the first rotor is by a 1b 1, b 1c 1, c 1d 1, d 1e 1, e 1f 1, f 1g 1, g 1h 1, h 1i 1, i 1j 1Nine sections curves are formed.
4. rotor of helical lobe compressor according to claim 1 is characterized in that, the end face molded lines of described second rotor is by a 2b 2, b 2c 2, c 2d 2, d 2e 2, e 2f 2, f 2g 2, g 2h 2, h 2i 2, i 2j 2Nine sections curves are formed.
CN 201010607302 2010-12-27 2010-12-27 Rotor profiles of screw compressors Expired - Fee Related CN102022335B (en)

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CN102352846B (en) * 2011-10-25 2013-09-18 上海戈里流体机械有限公司 Oil-free dry screw compressor rotor
CN105257537B (en) * 2015-11-03 2017-08-04 晗森机械（上海）有限公司 A kind of rotor end-face flute profile of three teeth helical-lobe compressor
CN106640628A (en) * 2016-10-09 2017-05-10 广东技术师范学院 Micro meshing clearance high-pressure screw pump
CN109630412A (en) * 2018-12-12 2019-04-16 珠海格力电器股份有限公司 Screw rotor and compressor
CN110735792A (en) * 2019-10-31 2020-01-31 珠海格力电器股份有限公司 screw rotor and compressor

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US7488164B2 (en) * 2005-05-23 2009-02-10 Eaton Corporation Optimized helix angle rotors for Roots-style supercharger
CN1328513C (en) * 2005-11-21 2007-07-25 西安交通大学 Method for designing molded lines of rotor of helical lobe compressor
CN101545488B (en) * 2008-03-28 2011-06-15 万晓青 End face tooth form of novel screw compressor
CN101603532A (en) * 2009-06-30 2009-12-16 西安交通大学 A kind of double-screw mixing transmission pump tooth type

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