CN207686980U - A kind of varying pitch alloy screw rotor - Google Patents
A kind of varying pitch alloy screw rotor Download PDFInfo
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- CN207686980U CN207686980U CN201721837435.7U CN201721837435U CN207686980U CN 207686980 U CN207686980 U CN 207686980U CN 201721837435 U CN201721837435 U CN 201721837435U CN 207686980 U CN207686980 U CN 207686980U
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- screw rotor
- pilot hole
- screw
- helical blade
- pitch
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Abstract
The utility model provides a kind of varying pitch alloy screw rotor, belongs to vaccum pump unit technical field.It solves the problems, such as that existing screw rotor Corrosion Protection is poor.This varying pitch alloy screw rotor, including helical blade and shaft, the helical blade includes columned matrix, the outer surface of described matrix has axially distributed helical tooth, concentric pilot hole is also provided in described matrix, the shaft stretch into pilot hole and with pilot hole tight fit, the helical blade is made of anticorrosion material.The utility model is designed using seperated, and while ensureing helical blade anti-corrosion, for shaft using the lower material of coefficient of thermal expansion, axial expansion amount is excessive and deform stuck when screw rotor being avoided to work, and enables screw rotor in corrosive medium occasion steady operation.
Description
Technical field
The utility model belongs to vaccum pump unit technical field, is related to a kind of varying pitch alloy screw rotor.
Background technology
Dry screw vacuum pump is a kind of positive displacement pump, makees synchronous high-speed reverse rotation in pump case using a pair of of screw rotor
And air-breathing and scavenging action are generated, it is mainly used in the vacuum technology process of high-purity, vacuum degree is high, is suitable for severe work
Condition has to extract and coagulates property, the ability of the gas containing particulate matter, especially suitable for electronics, chemical industry, biological medicine, intermetallic composite coating, food
Processing and other fields.
The screw rotor of screw vacuum pump is broadly divided into constant lead screw rotor and varying pitch screw rotor, wherein uniform pitch
Screw rotor pumping efficiency is low, and power consumption is big, and will produce higher heat in exhaust end, easily leads to screw rotor thermal expansion deformation
And it is stuck.Applicant has applied for a kind of Chinese patent (application number of energy-saving and low noise variable pitch screw vacuum pump before this：
201520932917.5), the screw rotor of the vacuum pump includes the first screw rod area, the second screw rod area and third spiral shell being arranged in order
Bar area, the clearing end of the initiating terminal in the first screw rod area to the second screw rod area, screw pitch gradually increase, and the tail end in the second screw rod area arrives
Its screw pitch of the tail end in third screw rod area is gradually reduced, to make the energy consumption of vacuum pump be greatly reduced with noise.However vacuum pump
When the corrosive mediums occasion such as medication chemistry works, the helical tooth of screw rotor is highly prone to corrode and fail.Currently, in the market
The anti-corrosion treatment of most of screw rotors only increases erosion resistant coating, however the company between erosion resistant coating and screw rotor on its surface
It is not high to connect intensity, easily removes in use, Corrosion Protection is poor.
Invention content
The purpose of this utility model is the presence of the above problem in view of the prior art, it is proposed that a kind of varying pitch alloy screw
Rotor, technical problem to be solved in the utility model are：How to make screw rotor in corrosive medium occasion long-term stable operation.
The purpose of this utility model can be realized by following technical proposal：
A kind of varying pitch alloy screw rotor, the screw rotor include helical blade and shaft, the helical blade packet
Columned matrix is included, the outer surface of described matrix has axially distributed helical tooth, is also provided in described matrix concentric
Pilot hole, the shaft stretch into pilot hole and with pilot hole tight fit, the helical blade is made of anti-corrosion material.
This screw rotor is the screw rotor in screw vacuum pump, and two oppositely oriented screw rotors match, and true
The shell of sky pump forms mutually independent pumping cavity between each screw pitch together, and gas is realized by rotating screw rotor
It pumps.Since some vacuum pumps need to work in the environment of with corrosion, this screw rotor by seperated helical blade and
Shaft is composed, and helical blade is integrally made of anticorrosion material, makes it have stable corrosion proof function, is ensured true
Sky pump can be run steadily in the long term.Moreover, because screw rotor has higher temperature at work, and anticorrosion material has
There is higher coefficient of thermal expansion, existing screw rotor uses separate structure, shaft not to be in direct contact with etchant gas, and heat may be used
The non-anti-corrosion materials such as the lower carbon steel of the coefficient of expansion on the basis of ensureing that screw rotor is etch-proof, and can reduce screw rod
The axial expansion amount of rotor avoids screw rotor from excessively expanding in an axial direction and deforms stuck, ensures the steady operation of screw rotor.
Meanwhile anticorrosion material only uses in helical blade, reduces the dosage of anticorrosion material, has saved cost.
In above-mentioned varying pitch alloy screw rotor, one end of described matrix is also provided with concentric with pilot hole and is connected to
Limit hole, the aperture of the limit hole is more than the aperture of pilot hole, the shaft include axially distributed the first linkage section,
Changeover portion, the second linkage section and limit convex shoulder, the aperture of the changeover portion are less than the aperture of pilot hole, first linkage section and
Second linkage section is connect with the both ends interference of pilot hole respectively, the limit convex shoulder be located in limit hole and with the bottom wall of limit hole
Against.Convex shoulder is limited with limit hole bottom wall against to ensure the cooperation precision of shaft and helical blade, while shaft and pilot hole
Both ends interference fit, contact area between the two is reduced under the premise of ensureing bonding strength, reduces the processing of shaft
Difficulty.
In above-mentioned varying pitch alloy screw rotor, the both sides of the limit convex shoulder are equipped with escape.Escape
Setting, convenient for the processing of limit convex shoulder.
In above-mentioned varying pitch alloy screw rotor, the helical blade is by stainless steel, Hastelloy or titanium alloy system
At.
In above-mentioned varying pitch alloy screw rotor, the shaft is made of 40Cr or 40CrMoV.40Cr and
40CrMoV has stronger rigidity and coefficient of thermal expansion is low, not only ensure that the intensity of screw rotor, but also screw rotor is avoided to make
It is excessive with swell increment in the process and cause to deform stuck.
In above-mentioned varying pitch alloy screw rotor, one end of the screw rotor is inlet end, and the other end is exhaust
End, the helical blade include along the first screw pitch area that inlet end to exhaust end is sequentially distributed and the second screw pitch area described first
The tooth top thickness of screw pitch area helical tooth gradually increases along the direction of inlet end to exhaust end, the tooth top of second screw pitch area helical tooth
Thickness is gradually reduced along the direction of inlet end to exhaust end.Such design increases the volume of the first screw pitch area pumping cavity, i.e.,
The rate of air sucked in required of inlet end is increased, and the compression ratio for making the first screw pitch area be transitioned into the second screw pitch area increases, and gas is made to press
It is compressed rapidly when strong relatively low, so as to reduce the compression ratio between the second each screw pitch in screw pitch area, keeps the second screw pitch area each
Pressure difference between screw pitch is relatively low, and to reduce the regurgitation volume of gas, the gas that makes to backflow is to the cavitation erosion smaller of helical blade, to prolong
The service life of long bolt rotor, and the heat of the reduction screw rotor of gas backflow and noise are greatly reduced, and make vacuum
The energy consumption of pump is also lower.
In above-mentioned varying pitch alloy screw rotor, several go is provided on the helical tooth crest top land in first screw pitch area
Balance hole, it is described that balance hole is gone to be arranged in order along the extending direction of helical tooth.That removes balance hole opens up the barycenter for making screw rotor
Positioned at the middle part of the axial line of screw rotor, keep screw rotor rotation more stable.
Compared with prior art, the utility model has the following advantages：
1, the utility model is matched using seperated shaft and helical blade, and helical blade is made of anti-corrosion material,
The antiseptic property of screw rotor is improved, shaft uses coefficient of thermal expansion relatively low and the preferable carbon steel of rigidity, makes screw rotor
It can still ensure the stabilization of structure when working at high temperature.
2, the helical tooth design of the utility model can reduce exhaust end gas backflow, reduce the noise and heat of screw rotor
Amount, reduces the cavitation erosion of helical tooth, and energy consumption is lower.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the sectional view of helical blade；
Fig. 3 is the structural schematic diagram of shaft.
In figure, 1, shaft；11, the first linkage section；12, changeover portion；13, the second linkage section；14, convex shoulder is limited；2, spiral
Blade；21, matrix；211, pilot hole；212, limit hole；22, helical tooth；3, the first screw pitch area；4, the second screw pitch area；5, it goes to put down
Weighing apparatus hole.
Specific implementation mode
It is specific embodiment of the utility model and in conjunction with attached drawing below, the technical solution of the utility model is made further
Description, but the utility model is not limited to these examples.
A kind of varying pitch alloy screw rotor is applied in Twin-screw vacuum pump, including shaft 1 and helical blade 2, spiral
Pilot hole 211 is provided on blade 2 in an axial direction, shaft 1 forms an entirety with pilot hole 211 by interference fit.Wherein, shaft
1 is made of carbon steel such as 40Cr or 40CrMoV, and helical blade 2 is using anti-corrosion materials such as stainless steel, Hastelloy or titanium alloys
It is made, to improve the resistance to corrosion of screw rotor, the corrosive mediums occasion such as medication chemistry can be adapted to.
Specifically, as shown in Figure 1 and Figure 2, helical blade 2 includes columned matrix 21 and is axially distributed along matrix 21
Helical tooth 22, matrix 21 and 22 integrally connected of helical tooth, pilot hole 211 are located on the axis of matrix 21.One end of screw rotor
For inlet end, the other end is exhaust end, and matrix 21 is provided with limit hole that is coaxial with pilot hole 211 and being connected to by inlet end side
212, the aperture of limit hole 212 is more than pilot hole 211.As shown in figure 3, the first linkage section has been sequentially distributed in shaft 1 in an axial direction
11, changeover portion 12, the second linkage section 13 and limit convex shoulder 14, wherein the diameter of the first linkage section 11 and the second linkage section 13 omits
More than the aperture of pilot hole 211, the diameter of changeover portion 12 is less than the aperture of pilot hole 211, and such shaft 1 stretches into pilot hole 211
When coordinating with helical blade 2, two linkage sections are interference fitted with the both ends of pilot hole 211 by thermal expansion temperature differential method respectively, limit
Convex shoulder 14 is located in limit hole 212 and with the bottom wall of limit hole 212 against keeping the cooperation of shaft 1 and helical blade 2 more accurate.
In addition, the both sides of limit convex shoulder 14 are equipped with escape, convenient for the processing of limit convex shoulder 14.
As shown in Figure 1 and Figure 2, helical tooth 22 includes 3 He of the first screw pitch area being arranged in order to exhaust extreme direction along inlet end
Second screw pitch area 4, wherein the tooth top thickness of 3 helical tooth 22 of the first screw pitch area gradually increases along the direction of inlet end to exhaust end, the
The tooth top thickness of two screw pitch areas, 4 helical tooth 22 is gradually reduced along the direction of inlet end to exhaust end.In this way, inlet end can either be increased
It is evacuated the volume of cavity, increases rate of air sucked in required, while also improving the compression ratio of screw rotor inlet end side, gas is made to enter
It is compressed rapidly behind second screw pitch area 4, the pressure difference smaller being respectively evacuated in the second screw pitch area 4 between cavity, gas backflow amount is less,
Heat and noise caused by gas backflow is greatly reduced, keeps the energy consumption of vacuum pump lower.
Further, in order to ensure screw rotor rotation when dynamic balancing, 22 crest top land of helical tooth in the first screw pitch area 3
On be provided with balance hole 5, go balance hole 5 to be arranged in order along the extending direction of helical tooth 22.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Although shaft 1, the first linkage section 11, changeover portion 12, the second linkage section 13, limit convex shoulder is used more herein
14, helical blade 2, matrix 21, helical tooth 22, the first screw pitch area 3, the second screw pitch area 4, remove the terms such as balance hole 5, but do not arrange
Except the possibility for using other terms.The use of these items is only for more easily describe and explain the sheet of the utility model
Matter；It is contrary to the spirit of the present invention to interpret them as any one of the additional limitations.
Claims (7)
1. a kind of varying pitch alloy screw rotor, which is characterized in that the screw rotor includes helical blade (2) and shaft (1),
The helical blade (2) includes columned matrix (21), and the outer surface of described matrix (21) has axially distributed spiral
Tooth (22), is also provided with concentric pilot hole (211) in described matrix (21), the shaft (1) stretch into pilot hole (211) and with
Pilot hole (211) tight fit, the helical blade (2) are made of anticorrosion material.
2. varying pitch alloy screw rotor according to claim 1, which is characterized in that also open one end of described matrix (21)
There are limit hole (212) that is concentric with pilot hole (211) and being connected to, the aperture of the limit hole (212) to be more than pilot hole (211)
Aperture, the shaft (1) include axially distributed the first linkage section (11), changeover portion (12), the second linkage section (13) and
Limit convex shoulder (14), the aperture of the changeover portion (12) is less than the aperture of pilot hole (211), first linkage section (11) and the
Two linkage sections (13) are connect with the both ends interference of pilot hole (211) respectively, and the limit convex shoulder (14) is located in limit hole (212)
And with the bottom wall of limit hole (212) against.
3. varying pitch alloy screw rotor according to claim 2, which is characterized in that the both sides of the limit convex shoulder (14)
It is equipped with escape.
4. varying pitch alloy screw rotor according to claim 1, which is characterized in that the helical blade (2) is by stainless
Steel, Hastelloy or titanium alloy are made.
5. varying pitch alloy screw rotor according to claim 1, which is characterized in that the shaft (1) by 40Cr or
40CrMoV is made.
6. varying pitch alloy screw rotor according to claim 2 or 3, which is characterized in that one end of the screw rotor
For inlet end, the other end is exhaust end, and the helical blade (2) includes the first screw pitch being sequentially distributed along inlet end to exhaust end
Area (3) and the second screw pitch area (4), the tooth top thickness of first screw pitch area (3) helical tooth (22) is along the side of inlet end to exhaust end
Increase to gradual, the tooth top thickness of second screw pitch area (4) helical tooth (22) is gradually reduced along the direction of inlet end to exhaust end.
7. varying pitch alloy screw rotor according to claim 6, which is characterized in that the spiral shell in first screw pitch area (3)
Be provided on rotation tooth (22) crest top land it is several remove balance hole (5), it is described go balance hole (5) along helical tooth (22) extending direction successively
Arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721837435.7U CN207686980U (en) | 2017-12-25 | 2017-12-25 | A kind of varying pitch alloy screw rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721837435.7U CN207686980U (en) | 2017-12-25 | 2017-12-25 | A kind of varying pitch alloy screw rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207686980U true CN207686980U (en) | 2018-08-03 |
Family
ID=62995698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721837435.7U Active CN207686980U (en) | 2017-12-25 | 2017-12-25 | A kind of varying pitch alloy screw rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207686980U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925205A (en) * | 2019-12-02 | 2020-03-27 | 厚力德机器（杭州）有限公司 | Individual household closestool vacuum pump |
| CN112145415A (en) * | 2020-08-13 | 2020-12-29 | 合肥工业大学 | Screw rotor capable of eliminating unbalance by arranging cavities on end face |
-
2017
- 2017-12-25 CN CN201721837435.7U patent/CN207686980U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925205A (en) * | 2019-12-02 | 2020-03-27 | 厚力德机器（杭州）有限公司 | Individual household closestool vacuum pump |
| CN112145415A (en) * | 2020-08-13 | 2020-12-29 | 合肥工业大学 | Screw rotor capable of eliminating unbalance by arranging cavities on end face |
| CN112145415B (en) * | 2020-08-13 | 2022-06-14 | 浙江真空设备集团有限公司 | Screw rotor capable of eliminating unbalance by arranging cavities on end face |
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