CN216407159U - Large three-section variable-pitch screw profile line structure - Google Patents
Large three-section variable-pitch screw profile line structure Download PDFInfo
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- CN216407159U CN216407159U CN202121783788.XU CN202121783788U CN216407159U CN 216407159 U CN216407159 U CN 216407159U CN 202121783788 U CN202121783788 U CN 202121783788U CN 216407159 U CN216407159 U CN 216407159U
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- 230000006835 compression Effects 0.000 claims abstract description 24
- 238000007906 compression Methods 0.000 claims abstract description 24
- WABPQHHGFIMREM-AKLPVKDBSA-N lead-210 Chemical compound [210Pb] WABPQHHGFIMREM-AKLPVKDBSA-N 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims 3
- 239000011295 pitch Substances 0.000 abstract description 57
- 238000005086 pumping Methods 0.000 abstract description 10
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000003889 chemical engineering Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a large three-section variable-pitch screw profile structure, which comprises a rotating shaft, wherein the surface of the rotating shaft is fixedly connected with a spiral blade, the spiral blade comprises a first equal-distance section, a variable-pitch section and a second equal-distance section, the variable-pitch section is fixedly connected to the surface of one end of the first equal-distance section, the second equal-pitch section is fixedly connected to the surface of the variable-pitch section, the spiral blade comprises a simple pendulum line section, a root circle line section, a gradually-opened line section and a top circle line section, the simple pendulum line section, the root circle line section, the gradually-opened line section and the top circle line section form a continuous closed arc line structure, the maximum effective pumping speed is ensured to be obtained by the shortest pitch in an air inlet section, the exhaust pressure is ensured to be quickly reached and the compression heat is released by the reasonable compression ratio in a compression section, the sealing area is increased by more pitches in an exhaust section, the backflow in a pump is reduced, and the higher vacuum and air exhaust efficiency is obtained, the design of the screw vacuum pump with large pumping speed is suitable, and the production, the processing and the use are facilitated.
Description
Technical Field
The invention relates to the technical field of screw molded lines, in particular to a large three-section variable-pitch screw molded line structure.
Background
The variable pitch screw vacuum pump is a vacuum pumping device which is formed by a pair of variable pitch rotors meshed with each other and synchronously rotating at high speed in opposite directions in a pump cavity formed by a pump body, an air inlet side middle wall, an air outlet side middle wall and the like, thereby forming the functions of air suction, compression and air exhaust.
The variable pitch screw vacuum pump is limited by design and processing equipment, the large-scale air extraction rate is difficult to break through, the maximum air extraction rate of the conventional variable pitch screw vacuum pump in China is generally within 1500m3/h, the popularization and application of the variable pitch screw vacuum pump are limited, and particularly in the industries of basic chemical engineering, fine chemical engineering, petrochemical industry and the like, the process device needs to meet the large air extraction rate in the process device vacuumizing process, and the conventional method of connecting a plurality of screw pumps in parallel causes a series of problems of cost increase, equipment quantity and fault point increase, floor area increase and the like. Meanwhile, due to the limitation of design and processing equipment, most of domestic variable-pitch screw molded lines adopt a two-section type gradual-change pitch molded line structure, namely, an air inlet compression section and an air outlet section, the two-section type structures respectively correspond to pitch molded lines and are variable pitches and equal pitches, and compared with a three-section type variable pitch structure, the gradual-change pitch structure is low in pumping speed with the same volume and low in efficiency.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a large three-section variable-pitch screw type wire structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large three-section variable-pitch screw type line structure comprises a rotating shaft, wherein a spiral blade is fixedly connected to the surface of the rotating shaft, the spiral blade comprises a first equal-distance section, a variable-distance section and a second equal-distance section, the variable-distance section is fixedly connected to the surface of one end of the first equal-distance section, the second equal-distance section is fixedly connected to the surface of the variable-distance section, the spiral blade comprises a single pendulum line section, a root circle line section, an involute line section and an addendum circle line section, and the single pendulum line section, the root circle line section, the involute line section and the addendum circle line section form a continuous closed arc line structure;
the rectangular coordinate equation of the simple pendulum line segment is as follows:
the coordinate equation of the involute segment is as follows:
d is the diameter of a tooth crest circle, D is the diameter of a tooth root circle, A is the radius of an involute base circle, and P0 is the pitch.
Preferably, the first equidistant section is an air intake section, and the helical lead 210 has a pitch number of 1.5.
Preferably, the variable pitch section is a compression section, a variable pitch type line is adopted, the spiral lead is changed from 210 to 100, the number of pitches is 1, and the compression ratio is 2.1.
Preferably, the second equidistant section is an exhaust section, and a constant pitch type line is adopted, the spiral lead is 100, and the pitch number is 2.5.
Preferably, the helical blade and the rotating shaft are integrally processed and molded.
Preferably, the first equidistant section, the variable-pitch section and the second equidistant section are of continuous spiral structures and are fixedly connected to the surface of the rotating shaft.
The invention provides a large three-section variable-pitch screw profile structure, which adopts the design of the large three-section variable-pitch screw profile structure, namely an air inlet section, a compression section and an air outlet section, wherein the screw profile respectively corresponds to a constant pitch, a variable pitch and a constant pitch, the maximum effective pumping speed is ensured to be obtained at the shortest pitch in the air inlet section, the air outlet pressure is ensured to be quickly reached and the compression heat is released at the compression section by a reasonable compression ratio, the sealing area is increased at the air outlet section by more pitches, the backflow in a pump is reduced, the higher vacuum and pumping efficiency are obtained, and the large three-section variable-pitch screw profile structure is suitable for the design of a large-pumping-speed screw vacuum pump and is beneficial to production, processing and use.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a structural view of the end profile of the helical blade of the present invention.
In the figure: 1 rotating shaft, 11 helical blades, 12 first equidistant sections, 13 variable-pitch sections, 14 second equidistant sections, 15 simple pendulum line sections, 16 tooth root circle line sections, 17 involute line sections and 18 tooth tip circle line sections.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A large three-section variable-pitch screw type line structure comprises a rotating shaft 1, wherein a spiral blade 11 is fixedly connected to the surface of the rotating shaft 1, the spiral blade 11 comprises a first equal-distance section 12, a variable-distance section 13 and a second equal-distance section 14, the variable-distance section 13 is fixedly connected to one end surface of the first equal-distance section 12, the second equal-distance section 14 is fixedly connected to the surface of the variable-distance section 13, the spiral blade 11 comprises a simple pendulum line section 15, a tooth root circle line section 16, an involute section 17 and a tooth top circle line section 18, and the simple pendulum line section 15, the tooth root circle line section 16, the involute section 17 and the tooth top circle line section 18 form a continuous closed arc line structure;
the rectangular coordinate equation of the simple pendulum segment 15 is:
the coordinate equation for the involute segments is:
d is the diameter of a tooth crest circle, D is the diameter of a tooth root circle, A is the radius of an involute base circle, and P0 is the pitch.
Preferably, the first equidistant section 12 is an air intake section, and the helical lead 210 has a pitch number of 1.5.
Preferably, the pitch-variable section 13 is a compression section, and a pitch-variable profile is adopted, the screw lead is changed from 210 to 100, the pitch number is 1, and the compression ratio is 2.1.
Preferably, the second equidistant section 14 is an exhaust section, and a constant pitch type line is adopted, wherein the spiral lead is 100, and the pitch number is 2.5.
Preferably, the helical blade 11 and the rotating shaft 1 are integrally formed.
Preferably, the first equidistant section 12, the variable distance section 13 and the second equidistant section 14 are of a continuous spiral structure and are fixedly connected to the surface of the rotating shaft 1.
Examples
The large three-section variable-pitch screw profile structure can be divided into an air inlet section, a compression section and an air outlet section according to functions, and is respectively corresponding to the screw profile and is equal-pitch, variable-pitch and equal-pitch.
The air inlet section needs to ensure enough air inlet area to obtain the maximum air extraction rate, and a large-lead equal-pitch molded line is adopted in design, wherein the spiral lead is 210, and the pitch number is 1.5; the compression section needs to rapidly compress the pumped body and instantly releases compression heat so as to increase the cooling area of the pump body, replace the compression heat and reduce the exhaust temperature rise, the design of the compression section adopts a variable-pitch molded line, the spiral lead is changed from 210 to 100, the pitch number is 1, and the compression ratio is 2.1; the exhaust section needs to guarantee the internal seal of the pump, prevents pumping speed attenuation and vacuum degree reduction caused by gas backflow in the pump, increases the sealing area matched with the pump body as much as possible, releases compression heat through water cooling of a pump body jacket, and adopts a constant-pitch molded line, a spiral lead is 100, and the pitch number is 2.5.
Wherein, addendum circle diameter D equals 324 millimeters, dedendum circle diameter D equals 96 millimeters, pitch circle diameter de equals 210 millimeters to 8-shaped pump chambers are adapted, and the total cross-sectional area is:
As＝1453.67cm2。
at the same time, the lead L of the air suction sectionin210 mm, 1.5 turns, 315 mm (100 mm inlet length reserved), 100 mm initial lead in compression, and 100 mm final leadThe stroke is 210 mm, the number of spiral turns is 1 week, the length is 155 mm, and the lead L of the exhaust sectionoutThe total length L of the rotor is 720 mm, and the total number of spiral turns n is 5;
the internal geometric compression ratio is:
Vineffective suction volume between the teeth of the twin-screw rotor, in m3It can be expressed as:
Vin＝(As-2Ae)Lin＝(1453.67-2*389.56)*21＝14165.55cm3＝14.17L；
when the rotor speed n is 2950r/min (frequency 50Hz), the geometric pumping speed (or theoretical pumping speed) of the pump
When the rotor speed n is 2950r/min (frequency 60Hz), the geometric (or theoretical) pumping speed of the pump is St 2508, 1.2, 3009m3/h。
Claims (6)
1. The utility model provides a large-scale syllogic variable pitch screw rod type line structure, includes pivot (1), its characterized in that: the surface fixed connection of pivot (1) has helical blade (11), helical blade (11) include first equidistance section (12), displacement section (13) and second equidistance section (14), displacement section (13) fixed connection is in the one end surface of first equidistance section (12), second equidistance section (14) fixed connection is in the surface of displacement section (13), helical blade (11) include simple pendulum line section (15), root circle line section (16), involute section (17) and addendum circle line section (18), simple pendulum line section (15), root circle line section (16), involute section (17) and addendum circle line section (18) form continuous closed arc line structure;
the rectangular coordinate equation of the simple pendulum line segment (15) is as follows:
the coordinate equation of the involute segment (17) is as follows:
d is the diameter of a tooth crest circle, D is the diameter of a tooth root circle, A is the radius of an involute base circle, and P0 is the pitch.
2. The large three-stage variable pitch screw profile of claim 1, wherein: the first equidistant section (12) is an air inlet section, and the spiral lead 210 has the pitch number of 1.5.
3. The large three-stage variable pitch screw profile of claim 1, wherein: the variable pitch section (13) is a compression section, a variable pitch type line is adopted in design, the spiral lead is changed from 210 to 100, the pitch number is 1, and the compression ratio is 2.1.
4. The large three-stage variable pitch screw profile of claim 1, wherein: the second equidistant section (14) is an exhaust section and adopts an equidistant type line, the spiral lead is 100, and the pitch number is 2.5.
5. The large three-stage variable pitch screw profile of claim 1, wherein: the helical blade (11) and the rotating shaft (1) are integrally processed and formed.
6. The large three-stage variable pitch screw profile of claim 1, wherein: the first equal distance section (12), the variable distance section (13) and the second equal distance section (14) are of continuous spiral structures and are fixedly connected to the surface of the rotating shaft (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121783788.XU CN216407159U (en) | 2021-08-02 | 2021-08-02 | Large three-section variable-pitch screw profile line structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121783788.XU CN216407159U (en) | 2021-08-02 | 2021-08-02 | Large three-section variable-pitch screw profile line structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216407159U true CN216407159U (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121783788.XU Active CN216407159U (en) | 2021-08-02 | 2021-08-02 | Large three-section variable-pitch screw profile line structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216407159U (en) |
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2021
- 2021-08-02 CN CN202121783788.XU patent/CN216407159U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Large Three Section Variable Pitch Screw Profile Structure Effective date of registration: 20231211 Granted publication date: 20220429 Pledgee: Weihai Commercial Bank Co.,Ltd. Zibo Branch Pledgor: SHANDONG BOKE VACUUM TECHNOLOGY Co.,Ltd. Registration number: Y2023980070677 |