CN103982430B - The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile - Google Patents
The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile Download PDFInfo
- Publication number
- CN103982430B CN103982430B CN201410139393.4A CN201410139393A CN103982430B CN 103982430 B CN103982430 B CN 103982430B CN 201410139393 A CN201410139393 A CN 201410139393A CN 103982430 B CN103982430 B CN 103982430B
- Authority
- CN
- China
- Prior art keywords
- pump
- arc
- pump chamber
- sheet
- positive round
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Rotary Pumps (AREA)
Abstract
The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile.The invention discloses a kind of rotary-vane vaccum pump, provide a kind of geometry pumping speed that can increase substantially vacuum pump when not improving vacuum pump rotating speed, energy consumption is low, the design method of the high pumping rate rotary-vane vaccum pump pump chamber structure that working efficiency is high and pump chamber profile, solve the rotary-vane vaccum pump existed in prior art can only improve the pumping efficiency of vacuum pump technical problem by the rotating speed increasing motor, what it comprised the pump housing and bias is rotatably connected on pump rotor in pump housing pump chamber and tangent with pump chamber inwall, pump rotor radially slides and is connected to a pair blade, blade stretches out and envelope of sliding is against on corresponding pump chamber internal face, and suction port and relief opening is provided with on the both sides pump housing near pump rotor and pump chamber points of tangency, pump chamber is by upper, arc lower sheet and being connected to, a left side between arc lower sheet, the cylindrical cavities that right arc-like sheet encloses, the joint of four pieces of arc-like sheets is excessively smooth, and blade when sliding past joint and pump chamber internal face remain and seal the state of supporting.
Description
Technical field
The present invention relates to a kind of rotary-vane vaccum pump, particularly relate to one and can increase substantially vacuum pump geometry pumping speed waiting under speed conditions, working efficiency is high, the design method of the high pumping rate rotary-vane vaccum pump pump chamber structure that energy consumption is low and pump chamber profile.
Background technique
Vacuum pump is the device utilizing the methods such as machinery, physics, chemistry or physical chemistry to produce, improve and maintain vacuum in a certain enclosed space, it is widely used in the fields such as medication chemistry, electronic technology, vacuum drying, refrigeration, generally be divided into reciprocating vacuum pump, rotary-vane vaccum pump and molecular pump etc., rotary-vane vaccum pump is wherein the widest as backing pump application area, accounts for 60% ~ 70% in vacuum equipment configuration.The speed of exhaust of rotary-vane vaccum pump determines primarily of the key element such as pump chamber, rotor, throw of eccentric, rotating speed of vacuum pump, when the key dimension such as the pump housing, rotor, throw of eccentric of vacuum pump is determined, in order to improve the working efficiency that rotary-vane vaccum pump is bled, conventional method improves the rotating speed of vacuum pump, the motor speed of vacuum pump is brought up to 1400 revs/min from 500 revs/min, even rotating speed is brought up to 3000 revs/min.Although the raising of rotating speed can improve the working efficiency that vacuum pump is bled, the temperature rise that simultaneously there will be vacuum pump increases, and the wearing and tearing aggravation of blade, working stability declines, and the series of problems such as pumping fluid service life reduction, directly affect the normal performance of vacuum pump performance.
Summary of the invention
The present invention mainly provides a kind of geometry pumping speed that can increase substantially vacuum pump when not improving vacuum pump rotating speed, energy consumption is low, the design method of the high pumping rate rotary-vane vaccum pump pump chamber structure that working efficiency is high and pump chamber profile, solve the rotary-vane vaccum pump existed in prior art can only improve vacuum pump pumping efficiency by the rotating speed increasing motor, thus cause the temperature rise of vacuum pump to increase, the wearing and tearing aggravation of blade, working stability declines, the technical problem of pumping fluid service life reduction etc.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of high pumping rate rotary-vane vaccum pump pump chamber structure, what comprise the pump housing and bias is rotatably connected on pump rotor in pump housing pump chamber and tangent with pump chamber inwall, pump rotor radially slides and is connected to a pair blade, blade stretches out and envelope of sliding is against on corresponding pump chamber internal face, and suction port and relief opening is provided with on the both sides pump housing near pump rotor and pump chamber points of tangency, described pump chamber is by upper arc-like sheet, the cylindrical cavities that arc lower sheet and the left arc-like sheet be connected between arc-like sheet and arc lower sheet and right arc-like sheet enclose, upper arc-like sheet, arc lower sheet, the joint smooth transition of left arc-like sheet and right arc-like sheet, and blade when sliding past joint and pump chamber internal face remain and seal the state of supporting.By upper, under, left, the cylindrical cavities that right four pieces of arc-like sheets enclose is as the pump chamber of vacuum pump, relative to traditional positive circular pump chamber structure, its leaving area increases, thus can when vacuum pump rotating speed be constant, the object of vacuum pump geometry pumping speed is realized improving by increasing leaving area, the working efficiency of vacuum pump is high, energy consumption is low, and it is high to avoid the vacuum pump energy consumption produced by improving vacuum pump rotating speed, temperature rise is large, the wearing and tearing aggravation of blade, pump life of oil reduces, the technical problem of degradation under the working stability of vacuum pump, namely guaranteeing that vacuum pump is normal, the speed of exhaust is improve when stable operation.
As preferably, the radial center face of described upper arc-like sheet and arc lower sheet is coplanar, and pump rotor is inscribed within the middle part of arc-like sheet.Guarantee that vacuum pump keeps air-flow steady in suction and discharge process, be beneficial to the smooth running of vacuum pump.
As more preferably, the size of described left arc-like sheet and right arc-like sheet and shape identical and relatively go up arc-like sheet or arc lower sheet radial center face is symmetric.Make the symmetrical state of the pump chamber of vacuum pump, guarantee that vacuum pump pump chamber pressure change in whole service process is balanced, air-flow is steady, improves the stability that vacuum pump runs.
Also can be connected by the curved surface of other shape between upper and lower arc-like sheet, as preferably, the cross section of described upper arc-like sheet and arc lower sheet is elliptic curve, and the cross section of left arc-like sheet and right arc-like sheet is equal diameter circular arc line.When elliptic curve is connected with the upper and lower arc-like sheet of circular shape, joint seamlessly transits, namely guarantee that blade can not be beated or stuck phenomenon at tie point, and can also guarantee that after crossing tie point blade is along the oval smooth operation of pump chamber, makes blade and pump chamber internal face remain and seals the state of supporting.
A design method for high pumping rate rotary-vane vaccum pump pump chamber profile, comprises following sequential steps:
1) setting diameter is the benchmark positive round center of circle of D is O
2, diameter is the round heart of pump rotor of d is O
1, pump rotor circle is inscribed within benchmark positive round, and point of contact is J, and throw of eccentric is e;
2) benchmark positive round is relative to O
1and O
2line forms move to left benchmark positive round and the benchmark positive round that moves to right respectively left, to right translation eccentric distance e, and setting moves to left, the summit of benchmark positive round is A, AO
1elongation line is E with the benchmark positive round intersection point that moves to right, and the summit of the benchmark positive round that moves to right is B, BO
1elongation line is G with the benchmark positive round intersection point that moves to left;
3) the benchmark positive round moved to left is rotated counterclockwise α angle around the rotating shaft of pump rotor circle, and the benchmark positive round moved to right to turn clockwise α angle around the rotating shaft of pump rotor circle;
4) by elliptic curve S1 transition connect Vertex A and summit B; E and G is connected by elliptic curve S2 transition.
Based on the benchmark positive round of circle, also rotate rear by left and right moving reference positive round and formed pump chamber after connecting with elliptic curve, relative to the pump chamber structure of other shape, meeting under blade and pump chamber keep the airtight prerequisite be slidably connected, to make and processing is simple.
As preferably, in described step 3) perpendicular to O1O2 line pump rotor circle center line and the left intersection point of benchmark positive round be I, right intersection point is C, be H perpendicular to the benchmark positive round center line of O1O2 line with the benchmark positive round intersection point that moves to left, benchmark positive round intersection point is D with moving to right, and the benchmark positive round that moves to left and the intersection point of benchmark positive round on O1O2 line that move to right are F; Be major axis with HD, be semi-minor axis with FO2, with O2 the be center of circle of ellipse is drawn first oval, after the downward translation first in O1O2 direction ellipse, intersect at the E point moved to right in benchmark positive round and the G point moved to left in benchmark positive round, be elliptic curve S2 corresponding to the oval section of first between EG; Be major axis with IC, with JO
1for semi-minor axis, with O
1the second ellipse is drawn in the center of circle for ellipse, and the second ellipse is a with the benchmark positive round intersection point that moves to left, and the second ellipse is b with the benchmark positive round intersection point that moves to right, and is elliptic curve S1 corresponding to the oval section of second between ab.
Adopt elliptic curve S1 and S2 that said method makes, make to connect between left and right moving reference positive round smooth, blade is beated little when pump chamber inwall slides, blade change in resistance in sliding process is even, blade stability of rotation, guarantee good airproof performance between blade and pump chamber inwall, ensure the usability of vacuum pump.
Therefore, the design method of high pumping rate rotary-vane vaccum pump pump chamber structure of the present invention and pump chamber profile has following advantage: the cylindrical cavities enclosed by four pieces of arc-like sheets is as the pump chamber of vacuum pump, and pump chamber joint seamlessly transits and is left, right symmetry, relative to traditional positive circular pump chamber structure, effective aspirated volume increases, therefore when vacuum pump rotating speed is constant, the object improving vacuum pump geometry pumping speed is achieved by the effective aspirated volume increasing pump chamber, and vacuum pump normal operation is stablized, working efficiency is high, energy consumption is low, and it is high to avoid the vacuum pump energy consumption produced when improving vacuum pump rotating speed, temperature rise is large, the wearing and tearing aggravation of blade, pump life of oil reduces, degradation problem under the working stability of vacuum pump.
accompanying drawing illustrates:
Fig. 1 is the structural representation of high pumping rate rotary-vane vaccum pump pump chamber structure of the present invention;
Fig. 2 is the structural representation of pump chamber profile in the present invention;
Fig. 3 is the drafting schematic diagram of step 3) in the design method of high pumping rate rotary-vane vaccum pump pump chamber profile of the present invention;
Fig. 4 is the drafting schematic diagram of the first ellipse in the design method of high pumping rate rotary-vane vaccum pump pump chamber profile of the present invention;
Fig. 5 is the schematic diagram of elliptic curve S2 in the design method of high pumping rate rotary-vane vaccum pump pump chamber profile of the present invention;
Fig. 6 is the drafting schematic diagram of the second ellipse in the design method of high pumping rate rotary-vane vaccum pump pump chamber profile of the present invention;
Fig. 7 is the schematic diagram of elliptic curve S1 in the design method of high pumping rate rotary-vane vaccum pump pump chamber profile of the present invention;
Fig. 8 is the drafting figure of pump chamber profile in the design method of high pumping rate rotary-vane vaccum pump pump chamber profile of the present invention.
embodiment:
Below by embodiment, and by reference to the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure 1, a kind of high pumping rate rotary-vane vaccum pump pump chamber structure of the present invention comprises the pump rotor 2 be rotatably connected in the pump housing 1 receiving cavity 11 of the pump housing 1 and bias, pump rotor 2 has a radial groove, in radial groove, radial direction is slidably connected a pair blade 3, the two ends of blade 3 are radial respectively extends to that pump rotor 2 is outer and envelope is against on corresponding receiving cavity 11 internal face, blade 3 end corresponding with the inwall of receiving cavity 11 is arc surfaced, and keep airtight being slidably connected between equal with corresponding receiving cavity 11 internal face in blade 3 end of arc surfaced, as shown in Figure 2, pump chamber 11 is by upper arc-like sheet 6, the cylindrical cavities that arc lower sheet 7 and the left arc-like sheet 8 be connected between arc-like sheet 6 and arc lower sheet 7 and right arc-like sheet 9 enclose, the radial center face of upper arc-like sheet 6 and arc lower sheet 7 is coplanar, pump rotor 2 is inscribed within the middle part of arc-like sheet 6, the size of left arc-like sheet 8 and right arc-like sheet 9 and shape identical and relatively go up arc-like sheet 6 or arc lower sheet 7 radial center face is symmetric, upper arc-like sheet 6 wherein and the cross section of arc lower sheet 7 are elliptic curve, the cross section of left arc-like sheet 8 and right arc-like sheet 9 is equal diameter circular arc line, upper arc-like sheet 6, arc lower sheet 7, the joint smooth transition of left arc-like sheet 8 and right arc-like sheet 9, when guaranteeing that blade 3 slides past joint and pump chamber 11 internal face remain and seal the state of supporting.A suction port 4 and a relief opening 5 is being had on pump rotor 2 with the both sides pump housing 1 at arc-like sheet 6 point of contact.
A design method for high pumping rate rotary-vane vaccum pump pump chamber profile, comprises following sequential steps: as shown in figures 3 and 8,
1) setting diameter is benchmark positive round 12 center of circle of D is O
2, diameter is pump rotor circle 13 centers of circle of d is O
1, pump rotor circle 13 is inscribed within benchmark positive round 12, and point of contact is J, and throw of eccentric is e;
2) benchmark positive round 12 is relative to O
1and O
2line forms move to left benchmark positive round 14 and the benchmark positive round 15 that moves to right respectively left, to right translation eccentric distance e, and setting moves to left, the summit of benchmark positive round 14 is A, AO
1elongation line is E with benchmark positive round 15 intersection point that moves to right, and the summit of the benchmark positive round 14 that moves to right is B, BO
1elongation line is G with benchmark positive round 14 intersection point that moves to left;
3) the benchmark positive round 14 moved to left is rotated counterclockwise α angle around the rotating shaft of pump rotor circle 13, and the benchmark positive round 15 moved to right to turn clockwise α angle around the rotating shaft of pump rotor circle 13;
As shown in Figure 4,
4) perpendicular to O
1o
2pump rotor circle 13 center lines of line and the left intersection point of benchmark positive round 12 are I, and right intersection point is C, perpendicular to O
1o
2benchmark positive round 12 center line of line is H with benchmark positive round 14 intersection point that moves to left, and benchmark positive round 15 intersection point is D with moving to right, the benchmark positive round that moves to left 14 and move to right benchmark positive round 15 at O
1o
2intersection point on line is F; Be major axis with HD, with FO
2for semi-minor axis, with O
2the first ellipse 16 is drawn in the center of circle for ellipse, as shown in Figure 5, along O
1o
2intersect at the E point moved to right in benchmark positive round 15 and the G point moved to left in benchmark positive round 14 after the downward translation first in direction ellipse 16, be elliptic curve S219 corresponding to oval 16 sections of first between EG; As shown in Figure 6, be major axis with IC, with JO
1for semi-minor axis, with O
1it is a with benchmark positive round 14 intersection point that moves to left that the second ellipse 17, second oval 17 is drawn in the center of circle for ellipse, and the second ellipse 17 is b with benchmark positive round 15 intersection point that moves to right, and as shown in Figure 7, is elliptic curve S118 corresponding to oval 17 sections of second between ab.
Specific embodiment described herein is only to design of the present invention explanation for example.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (5)
1. a high pumping rate rotary-vane vaccum pump pump chamber structure, what comprise the pump housing (1) and bias is rotatably connected on pump rotor (2) in the pump housing (1) pump chamber (11) and tangent with pump chamber (11) inwall, pump rotor (2) radially slides and is connected to a pair blade (3), blade (3) stretches out and envelope of sliding is against on corresponding pump chamber (11) internal face, and suction port (4) and relief opening (5) is being provided with on pump rotor (2) with the both sides pump housing (1) of pump chamber (11) points of tangency, it is characterized in that: described pump chamber (11) is by upper arc-like sheet (6), the cylindrical cavities that arc lower sheet (7) and the left arc-like sheet (8) be connected between arc-like sheet (6) and arc lower sheet (7) and right arc-like sheet (9) enclose, upper arc-like sheet (6), arc lower sheet (7), the joint smooth transition of left arc-like sheet (8) and right arc-like sheet (9), and blade (3) when sliding past joint and pump chamber (11) internal face remain and seal the state of supporting, the cross section of described upper arc-like sheet (6) and arc lower sheet (7) is elliptic curve, and the cross section of left arc-like sheet (8) and right arc-like sheet (9) is equal diameter circular arc line, wherein pump chamber (11) is based on the benchmark positive round of circle, after also being rotated, then carries out connecting rear formation with elliptic curve by left and right moving reference positive round.
2. high pumping rate rotary-vane vaccum pump pump chamber structure according to claim 1, is characterized in that: the radial center face of described upper arc-like sheet (6) and arc lower sheet (7) is coplanar, and pump rotor (2) is inscribed within the middle part of arc-like sheet (6).
3. high pumping rate rotary-vane vaccum pump pump chamber structure according to claim 2, is characterized in that: the size of described left arc-like sheet (8) and right arc-like sheet (9) and shape identical and relatively go up arc-like sheet (6) or arc lower sheet (7) radial center face is symmetric.
4. a design method for high pumping rate rotary-vane vaccum pump pump chamber profile, is characterized in that: comprise following sequential steps:
1) setting diameter is benchmark positive round (12) center of circle of D is O
2, diameter is pump rotor circle (13) center of circle of d is O
1, pump rotor circle (13) is inscribed within benchmark positive round (12), and point of contact is J, and throw of eccentric is e;
2) benchmark positive round (12) is relative to O
1and O
2line forms move to left benchmark positive round (14) and the benchmark positive round (15) that moves to right respectively left, to right translation eccentric distance e, and setting moves to left, the summit of benchmark positive round (14) is A, AO
1elongation line is E with benchmark positive round (15) intersection point that moves to right, and the summit of the benchmark positive round that moves to right (14) is B, BO
1elongation line is G with benchmark positive round (14) intersection point that moves to left;
3) the benchmark positive round (14) moved to left is rotated counterclockwise α angle around the rotating shaft of pump rotor circle (13), and the benchmark positive round (15) moved to right to turn clockwise α angle around the rotating shaft of pump rotor circle (13);
4) by elliptic curve S1(18) transition connect Vertex A and summit B; By elliptic curve S2(19) transition connection E and G.
5. the design method of high pumping rate rotary-vane vaccum pump pump chamber profile according to claim 4, is characterized in that: perpendicular to O in described step 3)
1o
2pump rotor circle (13) center line of line and benchmark positive round (12) left intersection point are I, and right intersection point is C, perpendicular to O
1o
2benchmark positive round (12) center line of line is H with benchmark positive round (14) intersection point that moves to left, and benchmark positive round (15) intersection point is D with moving to right, and the benchmark positive round that moves to left (14) and the benchmark positive round (15) that moves to right are at O
1o
2intersection point on line is F; Be major axis with HD, with FO
2for semi-minor axis, with O
2the first ellipse (16) is drawn in the center of circle for ellipse, along O
1o
2intersect at the E point moved to right in benchmark positive round (15) and the G point moved to left in benchmark positive round (14) after the downward translation first in direction ellipse (16), be elliptic curve S2(19 corresponding to the first ellipse (16) section between EG); Be major axis with IC, with JO
1for semi-minor axis, with O
1the second ellipse (17) is drawn in the center of circle for ellipse, second ellipse (17) is a with benchmark positive round (14) intersection point that moves to left, second ellipse (17) is b with benchmark positive round (15) intersection point that moves to right, and is elliptic curve S1(18 corresponding to the second ellipse (17) section between ab).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410139393.4A CN103982430B (en) | 2014-04-09 | 2014-04-09 | The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410139393.4A CN103982430B (en) | 2014-04-09 | 2014-04-09 | The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103982430A CN103982430A (en) | 2014-08-13 |
| CN103982430B true CN103982430B (en) | 2016-02-17 |
Family
ID=51274541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410139393.4A Active CN103982430B (en) | 2014-04-09 | 2014-04-09 | The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103982430B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110025838B (en) * | 2019-05-31 | 2021-03-23 | 河南科技大学第一附属医院 | Quick sputum suction device for emergency treatment |
| CN113250957B (en) * | 2021-04-19 | 2022-11-08 | 湖南腾智机电有限责任公司 | Single-rotor vacuum pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB739334A (en) * | 1953-01-07 | 1955-10-26 | Vickers Electrical Co Ltd | Improvements in rotary pumps or compressors |
| US3917438A (en) * | 1972-08-24 | 1975-11-04 | Stal Refrigeration Ab | Rotary compressor of the sliding vane type |
| GB2075121A (en) * | 1980-04-25 | 1981-11-11 | Flamme J M | Rotary positive-displacement fluid-machines |
| JPS6258080A (en) * | 1985-05-30 | 1987-03-13 | Nippon Denso Co Ltd | Vane type compressor |
| CN1548703A (en) * | 2003-05-07 | 2004-11-24 | 宁 金 | Multi-arc cylinder body sliding sheet rotor positive displacement machinery |
| CN203835722U (en) * | 2014-04-09 | 2014-09-17 | 浙江飞越机电有限公司 | High-pumping-speed rotary vane type vacuum pump cavity structure |
-
2014
- 2014-04-09 CN CN201410139393.4A patent/CN103982430B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB739334A (en) * | 1953-01-07 | 1955-10-26 | Vickers Electrical Co Ltd | Improvements in rotary pumps or compressors |
| US3917438A (en) * | 1972-08-24 | 1975-11-04 | Stal Refrigeration Ab | Rotary compressor of the sliding vane type |
| GB2075121A (en) * | 1980-04-25 | 1981-11-11 | Flamme J M | Rotary positive-displacement fluid-machines |
| JPS6258080A (en) * | 1985-05-30 | 1987-03-13 | Nippon Denso Co Ltd | Vane type compressor |
| CN1548703A (en) * | 2003-05-07 | 2004-11-24 | 宁 金 | Multi-arc cylinder body sliding sheet rotor positive displacement machinery |
| CN203835722U (en) * | 2014-04-09 | 2014-09-17 | 浙江飞越机电有限公司 | High-pumping-speed rotary vane type vacuum pump cavity structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103982430A (en) | 2014-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205877184U (en) | Mechanical seal ring with imitative chinese sweet gum lobate shaped groove | |
| CN205877198U (en) | Mechanical seal ring with oval groove | |
| CN106015571A (en) | Mechanical seal ring with maple-leaf-like grooves | |
| CN204253335U (en) | Micropulsation Wriggling Pump Head and peristaltic pump | |
| CN103982430B (en) | The design method of high pumping rate rotary-vane vaccum pump pump chamber structure and pump chamber profile | |
| CN201696263U (en) | Double-core peristaltic pump | |
| CN103133697A (en) | Bilaterally rotatable end surface mechanical sealing structure with dovetail grooves | |
| CN203308712U (en) | Variable-pitch double-thread screw vacuum pump | |
| CN207761916U (en) | Linear hose pump | |
| CN103867440B (en) | Compressor | |
| CN203835723U (en) | Radial length fixed integral rotary piece type vacuum pump cavity structure | |
| CN203835722U (en) | High-pumping-speed rotary vane type vacuum pump cavity structure | |
| CN205779755U (en) | The centrifugal water pump that a kind of raising is the most high-lift | |
| CN103062046A (en) | Twisted-type rotor pump | |
| CN110285055A (en) | A kind of Twin-screw vacuum pump molded lines of rotor | |
| CN203717428U (en) | Centrifugal pump with rubber ring | |
| CN203285990U (en) | Dovetail groove end face mechanical sealing structure capable of rotating in two directions | |
| CN203822677U (en) | Rotary jet pump with pump shaft with performance of being not in contact with medium | |
| CN114658656A (en) | Straight claw type rotor profile for dry vacuum pump and design method thereof | |
| CN204511962U (en) | A kind of double shrouded wheel | |
| CN204140385U (en) | A kind of Vane-type hydraulic machine of improvement | |
| CN207178203U (en) | Deform scraping blade displacement pump | |
| CN202017765U (en) | Rotating shaft sealing device | |
| CN209294059U (en) | A kind of efficient double-suction centrifugal pump | |
| CN205117721U (en) | Rolling rotor type compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |