CN210977874U - Screw rotor end surface profile line structure - Google Patents
Screw rotor end surface profile line structure Download PDFInfo
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- CN210977874U CN210977874U CN201921402068.7U CN201921402068U CN210977874U CN 210977874 U CN210977874 U CN 210977874U CN 201921402068 U CN201921402068 U CN 201921402068U CN 210977874 U CN210977874 U CN 210977874U
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Abstract
The utility model relates to a screw rotor terminal surface type line structure, its characterized in that: the rotor comprises a pair of conjugate male rotor and female rotor, the number of teeth of the male rotor is z1, the number of teeth of the female rotor is z2, z1 and z2 are natural numbers which are more than or equal to 2, and the condition that z2-z1 is 0, 1 or 2 is satisfied. The utility model discloses screw rotor terminal surface type line structure can reduce fluid power loss and noise reduction, is fit for being applied to different positive displacement screw rod machinery such as various screw compressor, screw blower, screw vacuum pump, screw rod expander.
Description
The technical field is as follows:
the utility model relates to a screw rotor end face type line structure.
Background art:
positive displacement screw machines, which provide compressed air or effect pneumatic transport for the building industry, food, processing and pharmaceutical industry, are also widely used for the compression of refrigerants in refrigeration and air conditioning systems and for the compression of hydrocarbon gases in the chemical industry. The positive displacement screw machine completes the compression and transportation of gas by arranging a pair of mutually meshed spiral rotors in parallel in a machine body, and the pair of spiral rotors are called female rotors and male rotors.
Rotors with lobes generally outside the pitch circle, known as male rotors; rotors with concave teeth outside the pitch circle are called female rotors.
The end face molded lines of the female and male spiral rotors are formed by a plurality of sections of different curves, and the end face molded lines of the rotors perform spiral motion to form spiral tooth surfaces of the rotors; a sealing cavity is formed between the spiral tooth surfaces of the male and female spiral rotors and the shell, and the sealing cavity is continuously moved from the air suction port to the air discharge port through the synchronous opposite-direction double-rotation motion of the male rotor and the female rotor, so that the compression and the transmission of the gas are realized, and whether the molded line design of the screw rotor is excellent or not determines the working performance of the positive displacement screw machine.
The conventional screw rotor molded lines have the problem that sharp points exist in the molded lines, so that large airflow disturbance is caused, high noise is induced, the rotor structure is complex, the processing difficulty is high, the rotor is easy to wear, and the service life of a screw machine is shortened.
The invention content is as follows:
sign in the not enough of prior art, the utility model aims to provide a screw rotor terminal surface type line structure, this screw rotor terminal surface type line structure reasonable in design is favorable to reducing the noise that the air current disturbance produced.
The utility model discloses screw rotor terminal surface type line structure, its characterized in that: the rotor comprises a pair of conjugate male rotor and female rotor, the number of teeth of the male rotor is z1, the number of teeth of the female rotor is z2, z1 and z2 are natural numbers which are more than or equal to 2, and the condition that z2-z1 is 0, 1 or 2 is satisfied.
Further, the gear ratio of the male rotor to the female rotor is 3: 5.
Furthermore, each tooth-shaped molded line in the tooth-shaped molded lines on the end faces of the male rotor and the female rotor is formed by smoothly connecting seven sections of curves.
Further, the seven-segment tooth curve of each tooth of the male rotor and the female rotor is composed as follows:
further, the section lines sequentially taken from the long-side tooth root on each tooth of the male rotor are: arc f1k1, arc k1g1, arc g1h1, arc h1i1, arc e1f1, arc envelope b1e1, and arc a1b 1;
the section lines adopted on each tooth of the female rotor from the root of the long edge in sequence are as follows: an arc f2k2, an arc envelope k2g2, an arc envelope g2h2, an arc envelope h2i2, an arc envelope e2f2, an arc b2e2, and an arc b2b 2.
Furthermore, the end face molded lines of the male rotor and the female rotor are a circumferential array of single tooth types to rotation centers according to the number of teeth, and the single tooth wrap angle of the male rotor is 360/z 1, and the single tooth wrap angle of the female rotor is 360/z 2.
Further, the tooth top part curve segment of the long-side profile of the male rotor is an arc f1k1, which is located at the intersection point of k1 and e1f1 with the circle k1g1, and is tangent to the circle e1f1 at the intersection point f 1; the arc f1k1 is a pin tooth arc or a tooth top arc, and the arc envelope f2k2 is an envelope of the arc f1k 1;
the tooth top part curve section of the long-side line of the male rotor is an arc k1g1, the intersection point g1 of the circle where the arc is located and the circle g1h1 is tangent to the intersection point g1 of the circle k1g1, and an arc envelope line k2g2 is an envelope line of an arc k1g 1;
the arc g1h1 of the curve segment of the long-side molded line of the male rotor is tangent to the h1 at the intersection point of the circle h1i1 and the h1 at the intersection point of the circle g1h 1; the arc envelope line g2h2 is the envelope line of the arc g1h 1;
the root part of the long-side tooth of the male rotor is divided into a transition curve circular arc h1i1 which is tangent with h1 at the intersection point of the circle g1h1 and b1(i1) at the intersection point of the circle a1b 1; the circular arc h2i2 is an envelope curve of the circular arc h1i 1;
a partial circular arc a1b1 of the male rotor profile root circle having a radius equal to the male rotor root circle radius and tangent to b1 at the intersection point b1e 1; the arc a2b2 is an envelope of the arc a1b 1.
The tooth top part transition section arc e1f1 of the short side of the male rotor is tangent to the circle f1k1 at the intersection point f1 and smoothly transits to the intersection point f1 of f1k 1; the arc envelope e2f2 is the envelope of the arc e1f 1;
the male rotor curve section b1e1 is an arc envelope curve of a tooth top transition curve section b2e2 of a short-side profile of the female rotor, the female rotor arc b2e2 is tangent to the female rotor circle a2b2 at an intersection point b2 and smoothly transits with an e2f2 at an e2 point, the tooth top radius of the male rotor is ra1, the tooth root radius of the male rotor is rf1, the center distance is A, and the requirement that the ratio of 0.62 × A to ra1 is less than or equal to 0.75 × A is met.
Furthermore, the ratio of the tooth number z1 of the male rotor to the tooth number z2 of the female rotor is 2: 2, 2: 3, 2: 4, 3: 3, 3: 4, 3:5, 4: 4, 4: 5, 4: 6, 5: 5, 5: 6, 5: 7, 6: 7 and 6: 8.
The utility model discloses screw rotor terminal surface type line structure, its characterized in that: comprising a pair of conjugated male and female rotors, the male rotor having a number of teeth z1, the female rotor having a number of teeth z2, the male and female rotor tooth ratio being z 1: z 2-3: 5.
Furthermore, each tooth-shaped molded line in the tooth-shaped molded lines on the end faces of the male rotor and the female rotor is formed by smoothly connecting seven sections of curves.
Furthermore, the end surface molded lines of the male rotor and the female rotor are a single tooth type to a circumferential array of a rotation center according to the number of teeth, and the single-tooth wrap angle of the male rotor is 120 degrees, and the single-tooth wrap angle of the female rotor is 72 degrees.
The utility model discloses female rotor and male rotor's terminal surface profile line structure to positive displacement screw rod machinery has optimized, adopt more reasonable tooth ratio, and seven sections curves that connect gradually, smooth transition in succession between each section profile, the mutual noninterference of female and male rotor, the meshing line that the meshing of female and male rotor formed seals no breakpoint, it is little to leak triangle-shaped, the contact line length is reasonable, sealing performance is good, therefore can reduce fluid power loss and noise reduction, be fit for being applied to different positive displacement screw rod machinery such as various screw rod compressor, the screw rod air-blower, the screw rod vacuum pump, the screw rod expander.
Description of the drawings:
FIG. 1 is a schematic view of the profile composition of the end face of a screw rotor and its contact line;
FIG. 2 is an exemplary view of a 2: 2 type line and its contact line;
FIG. 3 is an exemplary illustration of a 2: 3 type line and its contact line;
FIG. 4 is an exemplary illustration of a 2: 4 type line and its contact line;
FIG. 5 is an exemplary illustration of a 3: 3 profile and its contact line, which may be used as a Roots blower or a twisted lobe blower;
FIG. 6 is an exemplary illustration of a 3: 4 type line and its contact line;
FIG. 7 is an exemplary illustration of a 3:5 profile and its contact line, which may be used as a Roots blower;
FIG. 8 is an exemplary illustration of a 4: 4 profile and its contact line, which may be used as a Roots blower or a twisted lobe blower;
FIG. 9 is an exemplary view of a 4: 5 type line and its contact line;
FIG. 10 is an exemplary view of a 4: 6 type line and its contact line;
FIG. 11 is an exemplary illustration of a 5: 5 profile and its contact line, which may be used as a Roots blower or a twisted lobe blower;
FIG. 12 is an exemplary illustration of a 5: 6 profile and its lines of contact;
figure 13 is an exemplary view of a 5: 7 profile and its contact lines.
The specific implementation mode is as follows:
an embodiment, the utility model discloses screw rotor terminal surface shaped line structure includes a pair of conjugate positive rotor and negative rotor, and positive rotor number of teeth z1, the number of teeth of negative rotor are z2, and z1 and z2 are more than or equal to 2's natural number, satisfy z2-z1 ═ 0, 1 or 2.
The ratio of the tooth number z1 of the male rotor to the tooth number z2 of the female rotor is 2: 2, 2: 3, 2: 4, 3: 3, 3: 4, 3:5, 4: 4, 4: 5, 4: 6, 5: 5, 5: 6, 5: 7, 6: 8.
But preferably the ratio of the male and female rotor teeth is 3: 5.
In order to better reduce the hydrodynamic loss and reduce the noise, each tooth-shaped profile of the tooth-shaped profiles of the end faces of the male rotor and the female rotor is formed by smoothly connecting seven sections of curves.
The seven-section tooth curve of each tooth of the male rotor and the female rotor comprises the following components:
the section lines adopted in sequence from the long-side tooth root on each tooth of the male rotor are as follows: arc f1k1, arc k1g1, arc g1h1, arc h1i1, arc e1f1, arc envelope b1e1, and arc a1b 1;
the section lines adopted on each tooth of the female rotor from the root of the long edge in sequence are as follows: an arc f2k2, an arc envelope k2g2, an arc envelope g2h2, an arc envelope h2i2, an arc envelope e2f2, an arc b2e2, and an arc b2b 2.
Furthermore, for reasonable design, the end face molded lines of the male rotor and the female rotor are a single tooth type to a circumferential array of a rotation center according to tooth numbers, and the single tooth wrap angle of the male rotor is 360 °/z1, the single tooth wrap angle of the female rotor is 360 °/z2, when z1 is 3 and z2 is 5, the single tooth wrap angle of the male rotor is 120 ° and the single tooth wrap angle of the female rotor is 72 °.
The tooth top part curve segment of the long-side line of the male rotor is an arc f1k1, and a circle at the intersection point k1 of the arc and a circle k1g1 and a circle e1f1 at the intersection point f1 are tangent; the arc f1k1 is a pin tooth arc or a tooth top arc or an arc with any radius, and the arc envelope line f2k2 is the envelope line of the arc f1k 1;
the tooth top part curve section of the long-side line of the male rotor is an arc k1g1, the intersection point g1 of the circle where the arc is located and the circle g1h1 is tangent to the intersection point g1 of the circle k1g1, and an arc envelope line k2g2 is an envelope line of an arc k1g 1;
the arc g1h1 of the curve segment of the long-side molded line of the male rotor is tangent to the h1 at the intersection point of the circle h1i1 and the h1 at the intersection point of the circle g1h 1; the arc envelope line g2h2 is the envelope line of the arc g1h 1;
the root part of the long-side tooth of the male rotor is divided into a transition curve circular arc h1i1 which is tangent with h1 at the intersection point of the circle g1h1 and b1(i1) at the intersection point of the circle a1b 1; the circular arc h2i2 is an envelope curve of the circular arc h1i 1;
a partial circular arc a1b1 of the male rotor profile root circle having a radius equal to the male rotor root circle radius and tangent to b1 at the intersection point b1e 1; the arc a2b2 is an envelope of the arc a1b 1.
The tooth top part transition section arc e1f1 of the short side of the male rotor is tangent to the circle f1k1 at the intersection point f1 and smoothly transits to the intersection point f1 of f1k 1; the arc envelope e2f2 is the envelope of the arc e1f 1;
the male rotor curve section b1e1 is an arc envelope curve of a tooth top transition curve section arc b2e2 of the female rotor short-side molded line; a female rotor arc b2e2 tangent to the female rotor circle a2b2 at intersection point b2 and smoothly transitioning with e2f2 at point e 2;
the seven sections of circular arcs and the envelope lines thereof can change the size of each section of curve according to different requirements, thereby generating rotors of screws with different changes.
Furthermore, for reasonable design, the radius of the tooth top of the male rotor is ra1, the radius of the tooth root of the male rotor is rf1, the center distance is A, and the condition that ra1 is more than 0.62 × A and less than or equal to 0.75 × A is met.
The manufacturing method of the end face profile of the screw rotor comprises the following steps:
step A, determining main parameters of a screw rotor pair: the center distance A of the centers of the male and female rotors, the number z1 of teeth of the male rotor, the number z2 of teeth of the female rotor, the radius ra1 of the tooth top of the male rotor and the radius rf1 of the tooth root of the male rotor;
b, determining an arc f1k1 of the tooth top part curve segment of the long-side molded line of the male rotor, determining an angle ∠ f1o1k1, determining an arc envelope f2k2 corresponding to the arc f1k1 on the female rotor by the meshing principle, wherein the circle center of the arc is at any point of an o1f1 straight line;
step C, determining a curve section arc k1g1 of the long-side molded line of the male rotor, wherein a point k1 is tangent to an arc f1k1, the circle center of the arc is at any point of a connecting line of the point k1 and the circle center of an arc f1k1, and determining a corresponding arc envelope k2g2 of the arc k1g1 on the female rotor according to the meshing principle;
d, determining a curve section arc g1h1 of the long-side molded line of the male rotor, wherein a point g1 is tangent to an arc k1g1, the circle center of the arc is at any point of a connecting line of the point g1 and the circle center of the arc k1g1, and determining a corresponding arc envelope line g2h2 of the arc g1h1 on the female rotor according to the meshing principle;
e, determining a transition curve circular arc h1i1 at the root part of the long-side tooth of the male rotor, wherein the h1 point is tangent to the circular arc g1h1, the circle center of the circular arc is at any point on a connecting line segment of the h1 point and the circle center of the circular arc g1h1, and determining a corresponding circular arc envelope h2i2 of the circular arc h1i1 on the female rotor according to the meshing principle;
step F, determining a circular arc a1b1 of the root circle part of the male rotor profile; arc a1b1 is the male rotor root circle; b2 is tangent to arc b2c2 at center o 1.
And G, determining an arc e1f1 of the tooth crest transition section of the short side of the male rotor, wherein the e1 point is tangent to the arc f1k1, the circle center of the arc is at any point on a connecting line segment of the f1 point and the circle center of the arc f1k1, and determining the corresponding arc e2f2 of the envelope curve of the arc e1f1 on the female rotor according to the envelope principle.
And step H, determining the coordinates of e2 and a2 from steps B to G, then ∠ e2o2i2 on the female rotor can be obtained, the number of teeth of the female rotor is z2, and ∠ e2o2i2 is subtracted from 360 degrees/z 2 to obtain ∠ a2o2e2, so that the angle size of the arc a2G2 can be obtained, thereby determining the coordinates of the e2 point until the arc a2e2 is completely determined, and determining the corresponding enveloping curve arc a1e1 of the arc a2e2 on the male rotor by an enveloping principle.
According to the invention, the male rotor and the female rotor are in arc transition from the tooth tops of the long edges and the tooth tops of the tooth roots of the long edges of the male rotor are in arc transition to enable molded lines to be constructed, the rotors have excellent machinability, the machining means is flexible, and the rotors can be machined and formed in a hobbing mode besides traditional milling and grinding forming; the screw molded lines with various tooth ratios and different size combinations can be deduced by adjusting the rotor composition teeth and curve parameters, so that the performance requirements under different pressure working conditions are met; the meshing of the rotors is stable and smooth; the rotor design method can be used for rotor designs of screw compressors, screw blowers, screw vacuum pumps, screw expanders and the like.
In another embodiment, the utility model discloses screw rotor terminal surface profile structure includes a pair of conjugated positive rotor and negative rotor, and positive rotor number of teeth z1, the number of teeth of negative rotor are z2, positive rotor and negative rotor number of teeth are z1 than: z 2-3: 5.
Furthermore, each tooth-shaped molded line in the tooth-shaped molded lines on the end surfaces of the male rotor and the female rotor is formed by smoothly connecting seven sections of curves; the section lines adopted on each tooth of the male rotor from the root of the long edge in sequence are as follows: arc f1k1, arc k1g1, arc g1h1, arc h1i1, arc e1f1, arc envelope b1e1, and arc a1b 1; the section lines adopted on each tooth of the female rotor from the root of the long edge in sequence are as follows: an arc f2k2, an arc envelope k2g2, an arc envelope g2h2, an arc envelope h2i2, an arc envelope e2f2, an arc b2e2, and an arc a2b 2.
And taking the respective rotation centers of the two rotors as the origin of coordinates, and analyzing the coordinates of each section of curve of each tooth of the male rotor and the female rotor as follows:
furthermore, the end surface molded lines of the male rotor and the female rotor are a single tooth type to a circumferential array of a rotation center according to the number of teeth, and the single-tooth wrap angle of the male rotor is 120 degrees, and the single-tooth wrap angle of the female rotor is 72 degrees.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (5)
1. The utility model provides a screw rotor terminal surface profile line structure which characterized in that: the rotor comprises a pair of conjugate male rotor and female rotor, the number of teeth of the male rotor is z1, the number of teeth of the female rotor is z2, z1 and z2 are natural numbers which are more than or equal to 2, and the condition that z2-z1 is 0, 1 or 2 is satisfied; the gear ratio of the male rotor to the female rotor is 3: 5; each tooth-shaped molded line in the tooth-shaped molded lines on the end faces of the male rotor and the female rotor is formed by smoothly connecting seven sections of curves; the seven-section tooth curve of each tooth of the male rotor and the female rotor comprises the following components:
the section lines adopted in sequence from the long-side tooth root on each tooth of the male rotor are as follows: arc f1k1, arc k1g1, arc g1h1, arc h1i1, arc e1f1, arc envelope b1e1, and arc a1b 1;
the section lines adopted on each tooth of the female rotor from the root of the long edge in sequence are as follows: an arc f2k2, an arc envelope k2g2, an arc envelope g2h2, an arc envelope h2i2, an arc envelope e2f2, an arc b2e2, and an arc b2b 2; the end face molded lines of the male rotor and the female rotor are a circumferential array of single tooth shapes to a rotation center according to the number of teeth, and the single tooth wrap angle of the male rotor is 360 degrees/z 1, and the single tooth wrap angle of the female rotor is 360 degrees/z 2; the addendum part curve segment of the long-side profile of the male rotor is an arc f1k1, and a circle at the intersection point of k1 and a circle e1f1 with the circle k1g1 is tangent to the circle at the intersection point f 1; the arc f1k1 is a pin tooth arc or a tooth top arc, and the arc envelope f2k2 is an envelope of the arc f1k 1;
the tooth top part curve section of the long-side line of the male rotor is an arc k1g1, the intersection point g1 of the circle where the arc is located and the circle g1h1 is tangent to the intersection point g1 of the circle k1g1, and an arc envelope line k2g2 is an envelope line of an arc k1g 1;
the arc g1h1 of the curve segment of the long-side molded line of the male rotor is tangent to the h1 at the intersection point of the circle h1i1 and the h1 at the intersection point of the circle g1h 1; the arc envelope line g2h2 is the envelope line of the arc g1h 1;
the root part of the long-side tooth of the male rotor is divided into a transition curve circular arc h1i1 which is tangent with h1 at the intersection point of the circle g1h1 and b1(i1) at the intersection point of the circle a1b 1; the circular arc h2i2 is an envelope curve of the circular arc h1i 1;
a partial circular arc a1b1 of the male rotor profile root circle having a radius equal to the male rotor root circle radius and tangent to b1 at the intersection point b1e 1; the circular arc a2b2 is an envelope curve of the circular arc a1b 1;
the tooth top part transition section arc e1f1 of the short side of the male rotor is tangent to the circle f1k1 at the intersection point f1 and smoothly transits to the intersection point f1 of f1k 1; the arc envelope e2f2 is the envelope of the arc e1f 1;
the male rotor curve section b1e1 is an arc envelope curve of a tooth top transition curve section b2e2 of a short-side profile of the female rotor, the female rotor arc b2e2 is tangent to the female rotor circle a2b2 at an intersection point b2 and smoothly transits with an e2f2 at an e2 point, the tooth top radius of the male rotor is ra1, the tooth root radius of the male rotor is rf1, the center distance is A, and the requirement that the ratio of 0.62 × A to ra1 is less than or equal to 0.75 × A is met.
2. The screw rotor face profile structure of claim 1, wherein: the ratio of the tooth number z1 of the male rotor to the tooth number z2 of the female rotor is 2: 2, 2: 3, 2: 4, 3: 3, 3: 4, 3:5, 4: 4, 4: 5, 4: 6, 5: 5, 5: 6, 5: 7, 6: 7 and 6: 8.
3. The utility model provides a screw rotor terminal surface profile line structure which characterized in that: comprising a pair of conjugated male and female rotors, the male rotor having a number of teeth z1, the female rotor having a number of teeth z2, the male and female rotor tooth ratio being z 1: z2=3: 5.
4. A screw rotor face profile line construction as claimed in claim 3 wherein: each tooth-shaped molded line in the tooth-shaped molded lines on the end faces of the male rotor and the female rotor is formed by smoothly connecting seven sections of curves.
5. A screw rotor face profile line construction as claimed in claim 3 wherein: the end face molded lines of the male rotor and the female rotor are circumferential arrays of single tooth shapes corresponding to rotation centers according to the number of teeth, the single-tooth wrap angle of the male rotor is 120 degrees, and the single-tooth wrap angle of the female rotor is 72 degrees.
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| CN201921402068.7U CN210977874U (en) | 2019-08-27 | 2019-08-27 | Screw rotor end surface profile line structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921402068.7U CN210977874U (en) | 2019-08-27 | 2019-08-27 | Screw rotor end surface profile line structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118855706A (en) * | 2024-06-21 | 2024-10-29 | 合肥通用机械研究院有限公司 | A two-stage twin-screw compressor rotor and its profile design method |
-
2019
- 2019-08-27 CN CN201921402068.7U patent/CN210977874U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118855706A (en) * | 2024-06-21 | 2024-10-29 | 合肥通用机械研究院有限公司 | A two-stage twin-screw compressor rotor and its profile design method |
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Effective date of registration: 20210409 Address after: No.288 Jiangnan Avenue Jiangnan Street Linhai Taizhou Zhejiang 317000 Patentee after: Zhejiang kelexi Power Equipment Co.,Ltd. Address before: 350001 room 605, building 3, 60 Chayuan Road, Jin'an District, Fuzhou City, Fujian Province Patentee before: Liu Yongsheng |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200710 |
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