CN104019032A - Roots vacuum pump with self-circulating oil sealing system - Google Patents
Roots vacuum pump with self-circulating oil sealing system Download PDFInfo
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- CN104019032A CN104019032A CN201410257159.1A CN201410257159A CN104019032A CN 104019032 A CN104019032 A CN 104019032A CN 201410257159 A CN201410257159 A CN 201410257159A CN 104019032 A CN104019032 A CN 104019032A
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- oil
- sealing
- seal
- roots pump
- lip
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- 238000007789 sealing Methods 0.000 title claims abstract description 109
- 239000010724 circulating oil Substances 0.000 title abstract 2
- 238000001816 cooling Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000000241 respiratory effect Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract 4
- 230000003068 static effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention relates to a roots vacuum pump with a self-circulating oil sealing system. A ring-shaped mechanical sealing pressure cover is fixed at the inner side of a front cover of a roots pump, wherein a ring-shaped mechanical sealing piece and a ring-shaped sealing shaft sleeve are fixed on the drive shaft; a ring-shaped lip seal lining base is arranged between the sealing shaft sleeve and the front cover of the roots pump; a ring-shaped lip-shaped seal is arranged at the joint of the lip seal lining base and the sealing shaft sleeve; the lip seal lining base, the sealing shaft sleeve, the mechanical sealing piece and the mechanical sealing pressure cover define a sealing cavity; and the sealing cavity is full filed with sealing oil. The roots vacuum pump disclosed by the invention has advantages as follows: the mechanical sealing piece and the lip-shaped sealing piece are combined, so that sealing oil realizes self-circulation between the vacuum cavity and the sealing cavity, and therefore oil supply between a rotary surface and a static surface of the mechanical sealing piece cannot be interrupted; even if the lip-shaped sealing piece is aged and deformed, sealing oil leaked into the vacuum cavity also can be recycled to the sealing cavity, thereby preventing the environment pollution.
Description
Technical field
The present invention relates to a kind of Roots pump, particularly a kind of Roots pump that possesses self-loopa seal oil system.
Background technique
Roots pump is that a kind of pushing by a pair of leaf rotor synchronous, counterrotating in pump chamber is used for mobile gas and realizes the vacuum pump of bleeding, and guarantee the effect that vacuum pump vacuumizes, and the drive end axle that leaf rotor is installed must good seal.
On market, most of Roots pumps mainly comprise the modes such as outside framework oil seal, mechanical seal, magnet fluid sealing, the sealing of magnetic couple coupling, sealed electric-motor in the sealing of drive end axle now, the effect of sealing is to intercept extraneous gas and enters into Roots vacuum pump chamber, thereby prevents the destruction to vacuum environment.
The sealing means of outside framework oil seal, respectively places an outside framework oil seal in inlet side and the normal pressure side of Roots pump, forms a Seal cage, fills with vacuum oil in Seal cage, forms oil seal.After outside framework oil seal excessive wear was lost efficacy, the vacuum oil in Seal cage starts seepage, until oil level, lower than the sealing station of outside framework oil seal, can not play seal action.Outside framework oil seal has cheap, easy for installation, sealing reliability advantages of higher, but its shortcoming is will lose efficacy after outside framework oil seal excessive wear, causes whole sealing system short working life.Once outside framework oil seal excessive wear, the oil in Seal cage can, to both sides seepage, cause very serious grunge pollution for normal pressure one side.
The sealing means of mechanical seal, the single mechanical seal of general employing, owing to lacking seal element at Seal cage near inlet side, in Seal cage, can not accumulate enough vacuum oil, make to need oil film seal (the relative stationary face of rotation surface of mechanical seal carries out High Rotation Speed and forms an oil film friction and form sealing) may sometimes occur oil-break, cause rotation surface and the stationary face of mechanical seal there is no oil film and occur dry friction causing damage.Mechanical seal simultaneously need to lean on rotation surface and stationary face degree of finish and the degree of balance to occur that any atomic little deviation also just can not play effective seal action, once there is particulate matter between rotation surface and stationary face, on its sealing surface, there will be slight crack to cause seal failure, therefore adopt the degree of vacuum of the Roots pump of mechanical seal can be lower than adopting the Roots pump of outside framework oil seal, and reliability be poor.If adopt two mechanical seals to substitute outside framework oil seal, can solve the hidden danger of single mechanical seal, but complex structure, cost is high.
The sealing means that outside framework oil seal combines with mechanical seal, adopt an outside framework oil seal and a mechanical seal, can play fine seal action (having adopted the oil seal of Seal cage), its shortcoming is, when outside framework oil seal lost efficacy after (short because of its working life), can only there is a mechanical seal job, cause sealing effect to decline.
Magnet fluid sealing mode, has good seal performance, the feature of long service life, its shortcoming is, cost and costliness thereof have adaptability very poor for dust, the temperature of applied environment, so can only apply in operating mode seldom, therefore be difficult to spread and use.
Sealed electric-motor mode, utilize motor shaft sealing and Roots pump to form integral sealing, sealing effect is better, its shortcoming is, sealed electric-motor belongs to special machines, is only suitable for specific Roots pump and some specific Production requirements, does not possess the replacing of general-purpose machine, suitable environment is minimum, and cost is high.
Adopting sealed electric-motor is to utilize motor shaft sealing and Roots pump to form integral sealing can effectively solve place not enough in outside framework oil seal and mechanical seal, but the standardized Roots pump that generally only has some foreign enterprises to produce adopts this kind of seal type.And cost is expensive.
Summary of the invention
The invention provides a kind of Roots pump that possesses self-loopa seal oil system, efficiently solve many technical problems such as the existing sealing effect of Roots pump sealing system of the prior art is poor, cost is higher, working life is short, equipment replacement inconvenience.
For addressing the above problem, the invention provides following technological scheme:
A Roots pump that possesses self-loopa seal oil system, comprises that the pump housing of a Roots pump, the described pump housing comprise be placed in a clutch shaft bearing frame, one second bearing bracket stand at described pump housing two ends and be fixed on the Roots pump protecgulum on described clutch shaft bearing frame; On described clutch shaft bearing frame, described the second bearing bracket stand, be respectively equipped with the first corresponding driving bearing, the second driving bearing, the described pump housing also comprises a live axle through described the first driving bearing, described the second driving bearing; Described Roots pump protecgulum inner side is fixed with the mechanical seal cover of an annular, on described live axle, be fixed with the mechanical sealing element of an annular, described mechanical sealing element outer surface and described mechanical seal cover internal surface are tangent, on described live axle, be fixed with the sealing axle sleeve of an annular, between described sealing axle sleeve and described Roots pump protecgulum, be provided with the lip envelope lining seat of an annular, described lip envelope lining seat is fixed on described Roots pump protecgulum; Described lip envelope lining seat and the joint of described sealing axle sleeve are provided with the lip-type seal part of an annular, and described lip-type seal part is fixed on described lip envelope lining seat above, and described lip-type seal part and described sealing axle sleeve are tangent; Described lip envelope lining seat, described sealing axle sleeve, described mechanical sealing element and described mechanical seal cover surround a Seal cage, in described Seal cage, are full of sealing oil; The described Roots pump pump housing, described live axle, described lip envelope lining seat and described lip-type seal part surround a vacuum chamber; Top in described Roots pump protecgulum is provided with an oil-way pipe, described oil-way pipe one end is communicated to described Roots pump protecgulum outer side wall, its the other end is communicated to described Seal cage by the through hole of described lip envelope lining seat, and described oil-way pipe is provided with a seal plug near one end of described Roots pump protecgulum outer side wall; Described Roots pump protecgulum internal upper part is provided with an oil collecting pipe, and described oil collecting pipe one end is provided with the oil-collecting guide sub being placed in described vacuum chamber, and its other end is communicated to described oil-way pipe.
On described clutch shaft bearing frame, described the second bearing bracket stand, be respectively equipped with corresponding first and get rid of oil bearing, second and get rid of oil bearing, the described pump housing also comprises that one gets rid of oil bearing, described second through described first and gets rid of the oily axle of getting rid of of oil bearing; Describedly get rid of the disc that corresponding described oil-collecting guide sub place on oily axle is provided with an annular.
Described oil-collecting guide sub is tubaeform joint, its horn mouth towards directly over.
Described lip envelope lining seat is upper is provided with a circulatory and respiratory hole near described Roots pump protecgulum place.
Described sealing axle sleeve and described mechanical sealing element are tangent.
Described annular mechanical seal cover and described Roots pump protecgulum joint are provided with a mechanical seal cover seal ring.
The described Roots pump that possesses self-loopa seal oil system, also comprises that one is fixed on the coupling link press span of described Roots pump protecgulum, and described coupling link press span, described mechanical seal cover and described live axle surround a common pressure chamber.
In described vacuum chamber, be provided with a cooling coil.
Described cooling coil is that red copper material is made.
The invention has the advantages that; mechanical sealing element is combined with lip-type seal part; make sealing oil realize self-loopa between vacuum chamber and Seal cage; guaranteeing between the rotation surface of mechanical sealing element and stationary face not can oil-break; even the aging distortion of lip-type seal part; also the sealing oil leaking in vacuum chamber can be recycled in Seal cage; prevent befouling environment; extend the working life of whole sealing system; guarantee sealing effect; and with low cost, simple in structure, parts for maintenance replace convenient, applicable working condition is wider, is convenient to large-scale promotion application.
Accompanying drawing explanation
Fig. 1 has the Roots pump of self-loopa seal oil system at the longitudinal profile structural representation at live axle place in the present invention.
Fig. 2 has the Roots pump of self-loopa seal oil system at the longitudinal profile structural representation that gets rid of oily axle place in the present invention.
Fig. 3 is the horizontal section structural representation in the present invention with the Roots pump of self-loopa seal oil system.
Fig. 4 is the local enlarged diagram of sealing configuration in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail, those skilled in the art is more clearly understood and how to put into practice the present invention.Although should be appreciated that in conjunction with its preferred specific embodiments and described the present invention, these embodiments are intended setting forth, rather than limit the scope of the invention.
As Figure 1-4, the present invention relates to a kind of Roots pump that possesses self-loopa seal oil system, the pump housing 1 that comprises a Roots pump, the pump housing 1 comprises and is placed in a clutch shaft bearing frame 11, one second bearing bracket stand 12 at the pump housing 1 two ends and is fixed on the Roots pump protecgulum 13 on clutch shaft bearing frame 11; On clutch shaft bearing frame 11, the second bearing bracket stand 12, be respectively equipped with corresponding the first driving bearing 111, the second driving bearing 121, the pump housing 1 also comprises a live axle 14 through the first driving bearing 111, the second driving bearing 121; On clutch shaft bearing frame 11, the second bearing bracket stand 12, be respectively equipped with corresponding first and get rid of oil bearing 112, second and get rid of oil bearing 122, the pump housing 1 also comprises that one gets rid of oil bearing 112, second through first and gets rid of the oily axle 15 of getting rid of of oil bearing 122.
Roots pump protecgulum 13 inner sides are fixed with the mechanical seal cover 2 of an annular, on live axle 14, be fixed with the mechanical sealing element 3 of an annular, mechanical sealing element 3 outer surfaces and mechanical seal cover 2 internal surfaces are tangent, and mechanical sealing element 3 is followed live axle 14 and rotated, and its outer surface is rotation surface; Mechanical seal cover 2 is fixed on Roots pump protecgulum 13, and its internal surface is stationary face, forms mechanical seal structure.
On live axle 14, be fixed with the sealing axle sleeve 15 of an annular, be provided with the lip envelope lining seat 16 of an annular between sealing axle sleeve 15 and Roots pump protecgulum 13, lip envelope lining seat 16 is fixed on Roots pump protecgulum 13; The joint of lip envelope lining seat 16 and sealing axle sleeve 15 is provided with the lip-type seal part 17 of an annular, and lip-type seal part 17 is fixed on lip envelope lining seat 16, and lip-type seal part 1 is tangent with sealing axle sleeve 15.Sealing axle sleeve 15 is followed live axle 14 and is rotated, and lip-type seal part 17 seals lining seat 16 by lip and is fixed on Roots pump protecgulum 13, forms lip-type seal structure.
Lip envelope lining seat 17, sealing axle sleeve 15, mechanical sealing element 3 and mechanical seal cover 2 surround a Seal cage 4, in Seal cage 4, are full of sealing oil; The Roots pump pump housing 1, live axle 14, lip envelope lining seat 16 and lip-type seal part 17 surround a vacuum chamber 5.Seal cage is herein not complete sealing configuration, but completely cuts off vacuum chamber and common pressure chamber, guarantees that vacuum chamber and common pressure chamber keep the cavity of sealing state by sealing oil, and lip-type seal structure can prevent that sealing oil from leaking to vacuum chamber.Sealing axle sleeve and described mechanical sealing element are tangent, reduce Seal cage space, save material.The described Roots pump that possesses self-loopa seal oil system, also comprise that one is fixed on the coupling link press span 18 of Roots pump protecgulum 13, it is non-enclosed construction that coupling link press span 18 mechanical seal covers 2 and live axle 14 surround a common pressure chamber 6 herein, and Roots pump outside is all atmospheric pressure environment.
In mechanical seal structure, the height of rotation surface and stationary face contacting point is lower than the fuel head of Seal cage 4 interior sealing oil, so is provided with oil film between rotation surface and stationary face, can effectively prevent that particulate matter from entering, and guarantees the effect of mechanical seal.Annular mechanical seal cover 2 and Roots pump protecgulum 13 joints are provided with a mechanical seal cover seal ring 19 and guarantee good seal between annular mechanical seal cover 2 and Roots pump protecgulum 13.
On lip envelope lining seat 16, near Roots pump protecgulum 13 places, be provided with a circulatory and respiratory hole 20, because heat up (being mainly that friction generates heat causes sealing oil to heat up), density diminishes sealing oil in Seal cage 4, during volumetric expansion, sealing oil can be released thus, prevent device damage, can guarantee equally the interior oil-tightening height of Seal cage 4.In vacuum chamber 5, be provided with a cooling coil 7, cooling coil 7 is made for red copper material.Cooling coil is sealing oil have been carried out direct cooling, makes because the sealing oil of the gasification that heats up liquefies again, to collect.Cooling coil has adopted the copper tube of high efficient heat exchanging, not only high than cast iron materials heat transfer efficiency, can effectively prevent the ion etching in cooling water simultaneously.
Roots pump protecgulum 13 tops are provided with an oil-way pipe 21, oil-way pipe 21 one end are communicated to Roots pump protecgulum 13 outer side walls, the through hole that its other end seals lining seat 16 by lip is communicated to Seal cage 4, and oil-way pipe 21 is provided with a seal plug 22 near one end of Roots pump protecgulum 13 outer side walls.Before Roots pump uses, open the seal plug 22 of oil-way pipe 21, by oil-way pipe 21, to the interior injection sealing oil of Seal cage 4, after filling with, build seal plug.
Roots pump protecgulum 13 internal upper parts are provided with an oil collecting pipe 23, and oil collecting pipe 23 one end are provided with the oil-collecting guide sub 24 being placed in vacuum chamber 5, and its other end is communicated to oil-way pipe 21.Get rid of the disc 25 that corresponding oil-collecting guide sub 24 places on oily axle 15 are provided with an annular.
Sealing oil in Seal cage may be released to vacuum chamber 5 by circulatory and respiratory hole 20 because heat up, after the aging distortion of lip packing 17, sealing oil also may be leaked and be caused to vacuum chamber 5, will cause like this sealing oil liquid level height in Seal cage to decline, affect oil sealing effect, also can cause active face and the stationary face oil starvation of mechanical seal, and then affect mechanical seal effect.
Sealing oil in vacuum chamber, after cooling coil cooling processing, can concentrate the bottom that flow to vacuum chamber 5, disc 25 is followed and is got rid of oily axle 15 rotations, utilize centrifugal force the sealing oil of vacuum chamber 5 bottoms to be thrown in the oil-collecting guide sub 24 of top, by oil collecting pipe 23, be back in Seal cage 4 again, form the self-loopa of sealing oil.Oil-collecting guide sub 24 is tubaeform joint, its horn mouth towards directly over, be convenient to collect sealing oil drop.
The present invention combines mechanical sealing element with lip-type seal part; make sealing oil realize self-loopa between vacuum chamber and Seal cage; guaranteeing between the rotation surface of mechanical sealing element and stationary face not can oil-break; even the aging distortion of lip-type seal part; also the sealing oil leaking in vacuum chamber can be recycled in Seal cage; prevent befouling environment; extend the working life of whole sealing system; guarantee sealing effect; and with low cost, simple in structure, parts for maintenance replace convenient, applicable working condition is wider, is convenient to large-scale promotion application.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a Roots pump that possesses self-loopa seal oil system, comprises that the pump housing of a Roots pump, the described pump housing comprise be placed in a clutch shaft bearing frame, one second bearing bracket stand at described pump housing two ends and be fixed on the Roots pump protecgulum on described clutch shaft bearing frame; On described clutch shaft bearing frame, described the second bearing bracket stand, be respectively equipped with the first corresponding driving bearing, the second driving bearing, the described pump housing also comprises a live axle through described the first driving bearing, described the second driving bearing; Described Roots pump protecgulum inner side is fixed with the mechanical seal cover of an annular, on described live axle, be fixed with the mechanical sealing element of an annular, described mechanical sealing element outer surface and described mechanical seal cover internal surface are tangent, it is characterized in that, on described live axle, be fixed with the sealing axle sleeve of an annular, between described sealing axle sleeve and described Roots pump protecgulum, be provided with the lip envelope lining seat of an annular, described lip envelope lining seat is fixed on described Roots pump protecgulum; Described lip envelope lining seat and the joint of described sealing axle sleeve are provided with the lip-type seal part of an annular, and described lip-type seal part is fixed on described lip envelope lining seat above, and described lip-type seal part and described sealing axle sleeve are tangent; Described lip envelope lining seat, described sealing axle sleeve, described mechanical sealing element and described mechanical seal cover surround a Seal cage, in described Seal cage, are full of sealing oil; The described Roots pump pump housing, described live axle, described lip envelope lining seat and described lip-type seal part surround a vacuum chamber; Top in described Roots pump protecgulum is provided with an oil-way pipe, described oil-way pipe one end is communicated to described Roots pump protecgulum outer side wall, its the other end is communicated to described Seal cage by the through hole of described lip envelope lining seat, and described oil-way pipe is provided with a seal plug near one end of described Roots pump protecgulum outer side wall; Described Roots pump protecgulum internal upper part is provided with an oil collecting pipe, and described oil collecting pipe one end is provided with the oil-collecting guide sub being placed in described vacuum chamber, and its other end is communicated to described oil-way pipe.
2. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, it is characterized in that, on described clutch shaft bearing frame, described the second bearing bracket stand, be respectively equipped with corresponding first and get rid of oil bearing, second and get rid of oil bearing, the described pump housing also comprises that one gets rid of oil bearing, described second through described first and gets rid of the oily axle of getting rid of of oil bearing; Describedly get rid of the disc that corresponding described oil-collecting guide sub place on oily axle is provided with an annular.
3. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, is characterized in that, described oil-collecting guide sub is tubaeform joint, its horn mouth towards directly over.
4. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, is characterized in that, described lip envelope lining seat is upper is provided with a circulatory and respiratory hole near described Roots pump protecgulum place.
5. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, is characterized in that, described sealing axle sleeve and described mechanical sealing element are tangent.
6. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, is characterized in that, described annular mechanical seal cover and described Roots pump protecgulum joint are provided with a mechanical seal cover seal ring.
7. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, it is characterized in that, also comprise that one is fixed on the coupling link press span of described Roots pump protecgulum, described coupling link press span, described mechanical seal cover and described live axle surround a common pressure chamber.
8. the Roots pump that possesses self-loopa seal oil system as claimed in claim 1, is characterized in that, is provided with a cooling coil in described vacuum chamber.
9. the Roots pump that possesses self-loopa seal oil system as claimed in claim 8, is characterized in that, described cooling coil is that red copper material is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410257159.1A CN104019032A (en) | 2014-03-03 | 2014-06-11 | Roots vacuum pump with self-circulating oil sealing system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410072855.5A CN103899539A (en) | 2014-03-03 | 2014-03-03 | Roots vacuum pump with self-circulation oil seal system |
| CN201410072855.5 | 2014-03-03 | ||
| CN201410257159.1A CN104019032A (en) | 2014-03-03 | 2014-06-11 | Roots vacuum pump with self-circulating oil sealing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104019032A true CN104019032A (en) | 2014-09-03 |
Family
ID=50991059
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410072855.5A Pending CN103899539A (en) | 2014-03-03 | 2014-03-03 | Roots vacuum pump with self-circulation oil seal system |
| CN201410257159.1A Pending CN104019032A (en) | 2014-03-03 | 2014-06-11 | Roots vacuum pump with self-circulating oil sealing system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410072855.5A Pending CN103899539A (en) | 2014-03-03 | 2014-03-03 | Roots vacuum pump with self-circulation oil seal system |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN103899539A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990069A (en) * | 1988-11-07 | 1991-02-05 | Societe Anonyme Dite: Alcatel Cit | Multi-stage roots vacuum pump with sealing module |
| CN101074670A (en) * | 2007-06-18 | 2007-11-21 | 陈全玉 | Oilless roots vacuum pump with mechanical seal |
| CN201802625U (en) * | 2010-03-31 | 2011-04-20 | 百事德机械（江苏）有限公司 | Novel sealing structure of Roots blower |
| CN202391738U (en) * | 2011-11-11 | 2012-08-22 | 中国科学院沈阳科学仪器研制中心有限公司 | Roots vacuum pump |
| CN103075347A (en) * | 2013-01-19 | 2013-05-01 | 上海零澜机械科技有限公司 | Gap self-adaptive mixed type dual-sealing structure for roots pump drive end |
| CN203906288U (en) * | 2014-03-03 | 2014-10-29 | 苏州伊莱茨流体装备有限公司 | Roots vacuum pump with automatic-circulation oil sealing system |
-
2014
- 2014-03-03 CN CN201410072855.5A patent/CN103899539A/en active Pending
- 2014-06-11 CN CN201410257159.1A patent/CN104019032A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990069A (en) * | 1988-11-07 | 1991-02-05 | Societe Anonyme Dite: Alcatel Cit | Multi-stage roots vacuum pump with sealing module |
| CN101074670A (en) * | 2007-06-18 | 2007-11-21 | 陈全玉 | Oilless roots vacuum pump with mechanical seal |
| CN201802625U (en) * | 2010-03-31 | 2011-04-20 | 百事德机械（江苏）有限公司 | Novel sealing structure of Roots blower |
| CN202391738U (en) * | 2011-11-11 | 2012-08-22 | 中国科学院沈阳科学仪器研制中心有限公司 | Roots vacuum pump |
| CN103075347A (en) * | 2013-01-19 | 2013-05-01 | 上海零澜机械科技有限公司 | Gap self-adaptive mixed type dual-sealing structure for roots pump drive end |
| CN203906288U (en) * | 2014-03-03 | 2014-10-29 | 苏州伊莱茨流体装备有限公司 | Roots vacuum pump with automatic-circulation oil sealing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103899539A (en) | 2014-07-02 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Taicang City, Suzhou City, Jiangsu Province, and 215411 Metro Jianxiong Road No. 1 Applicant after: Yi Laici fluid Equipment Limited, Suzhou Applicant after: ELIVAC COMPANY, LTD. Applicant after: Xiao Ran Address before: Taicang City, Suzhou City, Jiangsu Province, and 215411 Metro Jianxiong Road No. 1 Applicant before: Yi Laici fluid Equipment Limited, Suzhou Applicant before: ELIVAC (Shanghai) Co., Ltd. Applicant before: Xiao Ran |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: SHANGHAI ELIVAC COMPANY, LTD. XIAO RAN TO: SHANGHAI ELIVAC VACUUM TECHNOLOGY CO., LTD. XIAO RAN |
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Application publication date: 20140903 |