CN201236837Y - Non-contact sealing device for cantilever submerged pump - Google Patents
Non-contact sealing device for cantilever submerged pump Download PDFInfo
- Publication number
- CN201236837Y CN201236837Y CNU2008200391467U CN200820039146U CN201236837Y CN 201236837 Y CN201236837 Y CN 201236837Y CN U2008200391467 U CNU2008200391467 U CN U2008200391467U CN 200820039146 U CN200820039146 U CN 200820039146U CN 201236837 Y CN201236837 Y CN 201236837Y
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- China
- Prior art keywords
- pump
- impeller
- propeller
- sub
- back blade
- 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.)
- Expired - Fee Related
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Abstract
The utility model disclose a non-contact sealing device for a cantilever underwater pump which comprises a pump shaft, a connecting pipe, a pump casing, an impeller and a front pump cover; back vanes are evenly arranged in the radial direction on the back surface of the impeller; and auxiliary impellers extend axially on the back vanes. The utility model adopt a combined design combining the back vanes with the auxiliary impellers; when the pump has a large flux, the negative pressure on the back part of the impeller can not be too high; when the pump has a small flux, the negative pressure on the back part of the impeller is increased; therefore, the pump keeps a proper negative pressure within the full flux range, the fluid is prevented from leakage, and an excellent sealing effect is achieved.
Description
Technical field
The utility model relates to a kind of cantilever Under Water Pumps, particularly a kind of cantilever Under Water Pumps contactless sealing unit, and this device can effectively solve the leakage problem of cantilever Under Water Pumps, improves the reliability of pump work under the cantilever liquid.
Technical background
The cantilever Under Water Pumps, the main shaft that is exactly this Under Water Pumps as its name suggests is cantilevered, there is the bearing supporting upper end of main shaft, but the lower end is supporting not, is cantilever, that is to say that the pump head lower end does not have the part of friction mutually, so the functional reliability height of cantilever Under Water Pumps can be driven empty wagons.But the sealing problem of cantilever Under Water Pumps but is a thorny thing.General sealing configuration is to be provided with sealing opening ring between the pump housing and the impeller, and the gap between the choma seldom stops leakage whereby, plays the effect of sealing.But because the cantilevered axle lower end of cantilever Under Water Pumps does not have any supporting, during work, pump shaft is subjected to bigger radial force and produces radial vibration, very little pump housing choma in gap and impeller port ring are collided and produces friction, causes wearing and tearing, vibrates.If strengthen the choma gap in order to prevent to collide friction, leakage rate can strengthen again, and sealing effect is bad again.And if contain in conveying under the situation of solid particle, solid particle can aggravate the wearing and tearing of choma, the gap between them is increased, thereby lose sealing effect, produces than gross leak, and the life-span is shorter.
For this reason, Chinese patent 94208351 provides a kind of " pump seal axle sleeve under the cantilever liquid ", it is designing an elastic packing axle sleeve near pump shaft cantilever one end, thereby reduce the gap between the pump housing and the pump shaft, under the prerequisite that does not change gap between pump housing choma and the impeller port ring, the barrier liquid leakage rate.Yet, the cantilever Under Water Pumps of this sealing axle sleeve is installed, because of there being friction between its sealing axle sleeve and other part, when conveying contains the medium of solid particle wearing and tearing more serious, and when empty wagons left by pump, more can cause friction and generate heat and burn out part, reliability is not high.
Summary of the invention
Goal of the invention: the purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of cantilever Under Water Pumps contactless sealing unit of good sealing effect to be provided.
Technological scheme: cantilever Under Water Pumps contactless sealing unit described in the utility model, comprise pump shaft, connecting tube, pump case, impeller and front pump cover, radially evenly be provided with back blade at the back side of impeller, it is characterized in that: extended axially sub-propeller in the back blade upper edge.
Working principle: at first, design some back blades at the impeller back side, when the impeller high speed rotating, this back blade can produce negative pressure at the impeller back, stop liquid to flow out from the impeller back, play the effect of sealing anti-leak, such structural design is when normal flow rate and big flow, sealing effect is obvious, and liquid that can not lets out from the impeller back.Because there are several millimeters in the gap behind this back blade and the pump case between the plate, and this gap is axial, so, when pump work the vibration of cantilevered axle big again, back blade is contacted with other part, can not produce mutual friction, so the reliability height.
Secondly, above-mentioned design is when small flow, because the fluid pressure in this moment pump case is bigger, the negative pressure that back blade produces also is not enough to stop fully the leakage of liquid, and for this reason, the position at the impeller back by the center increases the back blade width again, protrude a part, form the structure of a sub-propeller.Because the existence of this sub-propeller has further improved the negative pressure at pump impeller back when small flow, stops the leakage of liquid effectively, sealing effect is good.Simultaneously because the gap between sub-propeller and the pump case is bigger, so the situation of mutual friction can not take place to produce owing to spindle vibration.
Beneficial effect: the Combination Design that the utility model adopts back blade and sub-propeller to combine, both made pump when big flow, it is too high that the negative pressure at impeller back is unlikely to, the negative pressure at pump impeller back when small flow is increased, thereby make pump in the full flow scope, remain suitable negative pressure, effectively stop the leakage of liquid, sealing effect is fine.
Description of drawings
Accompanying drawing is a structural representation of the present utility model.
Embodiment
As shown in the figure, pump shaft 1 is positioned at the center of connecting tube 2, and its head is connected with the impeller 6 that is positioned at pump case 5, and front pump cover 7 is installed in the lower end of pump case 5, also can both link together.The back side at impeller 6 begins evenly radially to be provided with 6 back blades 4 from the axle root, back blade 4 radially extends to the outer circumferential edge edge of impeller, its shape can be a lineal shape, it also can be bending shape, or curved, on every back blade, begin to be provided with vertically sub-propeller 3, the length that is shorter in length than back blade of this sub-propeller from the axle root, half length of back blade makes back blade and sub-propeller be stairstepping in this way.The moulding together of sub-propeller and back blade also can separate moulding.Be designed to suitable and keep the shape in several millimeters gaps with back blade and sub-propeller at the inner chamber of pump case 5 position corresponding with back blade and sub-propeller.
Claims (4)
1, a kind of cantilever Under Water Pumps contactless sealing unit, comprise pump shaft (1), connecting tube (2), pump case (5), impeller (6) and front pump cover (7), the back side at impeller (6) radially evenly is provided with back blade (4), it is characterized in that: extended axially sub-propeller (3) in back blade (4) upper edge.
2, cantilever Under Water Pumps contactless sealing unit according to claim 1 is characterized in that: back blade (4) and sub-propeller (3) are stairstepping.
3, cantilever Under Water Pumps contactless sealing unit according to claim 1 and 2 is characterized in that: back blade (4) and sub-propeller (3) towards pump case (5) cavity inner wall for and back blade and sub-propeller shape adapting.
4, cantilever Under Water Pumps contactless sealing unit according to claim 1 and 2 is characterized in that: back blade (4) radially be shaped as lineal shape, or folding gulf shape, or curved, sub-propeller (3) has corresponding with it shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200391467U CN201236837Y (en) | 2008-08-08 | 2008-08-08 | Non-contact sealing device for cantilever submerged pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200391467U CN201236837Y (en) | 2008-08-08 | 2008-08-08 | Non-contact sealing device for cantilever submerged pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201236837Y true CN201236837Y (en) | 2009-05-13 |
Family
ID=40649577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200391467U Expired - Fee Related CN201236837Y (en) | 2008-08-08 | 2008-08-08 | Non-contact sealing device for cantilever submerged pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201236837Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900123A (en) * | 2009-05-29 | 2010-12-01 | 日本电产三协株式会社 | Fluid device and pump device |
| CN102588304A (en) * | 2012-02-10 | 2012-07-18 | 宁波大叶园林设备有限公司 | Centrifugal pump with swirl sprayer engine directly connected with high-speed function vane wheel and even-spinning labyrinth |
| CN103133355A (en) * | 2011-11-22 | 2013-06-05 | 黑拉许克联合股份有限公司 | Pump for temperature circulation circuit in vehicle |
| DE102018125040A1 (en) * | 2018-10-10 | 2020-04-16 | HELLA GmbH & Co. KGaA | Pump, in particular for a liquid circuit in a vehicle |
| CN114738287A (en) * | 2022-03-25 | 2022-07-12 | 苏州杰利凯工业设备有限公司 | Non-leakage fluoroplastic pump device with sealing impeller |
-
2008
- 2008-08-08 CN CNU2008200391467U patent/CN201236837Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900123A (en) * | 2009-05-29 | 2010-12-01 | 日本电产三协株式会社 | Fluid device and pump device |
| CN101900123B (en) * | 2009-05-29 | 2014-04-02 | 日本电产三协株式会社 | Fluid device and pump device |
| CN103133355A (en) * | 2011-11-22 | 2013-06-05 | 黑拉许克联合股份有限公司 | Pump for temperature circulation circuit in vehicle |
| CN102588304A (en) * | 2012-02-10 | 2012-07-18 | 宁波大叶园林设备有限公司 | Centrifugal pump with swirl sprayer engine directly connected with high-speed function vane wheel and even-spinning labyrinth |
| CN102588304B (en) * | 2012-02-10 | 2014-04-16 | 宁波大叶园林设备有限公司 | Centrifugal pump with swirl sprayer engine directly connected with high-speed function vane wheel and even-spinning labyrinth |
| DE102018125040A1 (en) * | 2018-10-10 | 2020-04-16 | HELLA GmbH & Co. KGaA | Pump, in particular for a liquid circuit in a vehicle |
| US11629729B2 (en) | 2018-10-10 | 2023-04-18 | HELLA GmbH & Co. KGaA | Pump, in particular for a liquid circuit in a vehicle |
| CN114738287A (en) * | 2022-03-25 | 2022-07-12 | 苏州杰利凯工业设备有限公司 | Non-leakage fluoroplastic pump device with sealing impeller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20160808 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |