CN1779275A - Improved axial force balancing structure of shielded pump - Google Patents
Improved axial force balancing structure of shielded pump Download PDFInfo
- Publication number
- CN1779275A CN1779275A CN 200410084383 CN200410084383A CN1779275A CN 1779275 A CN1779275 A CN 1779275A CN 200410084383 CN200410084383 CN 200410084383 CN 200410084383 A CN200410084383 A CN 200410084383A CN 1779275 A CN1779275 A CN 1779275A
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- Prior art keywords
- impeller
- pump
- bearing support
- shaft axis
- gap
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Abstract
An axial power balance device for a shield pump comprises pump body, pump axial, impeller and bearing support. The bearing support is fixed in the pump body. The pump axial is installed in the bearing support. The impeller fits over the axial and in front of the bearing base. On the front cover of the impeller installed a convex table. A column chamber is formed to the front of the impeller in the pump body. The column table is in the chamber and leaves a fixed gap to the chamber. On the back cover of the impeller fixed a convex column circle. A second column chamber is formed to the back of the impeller in the pump body. A fixed second gap is formed between the second chamber and the circle. A convex part on the bearing support faces to the impeller back cover. The gap between the convex parts to the back cover is axially adjustable. The axial gap and the radial gap form a hydraulic pressure balance system to balance the axial power and reduce friction.
Description
Technical field
The present invention relates to canned motorpump, particularly a kind of improved axial force balancing structure of shielded pump.
Background technique
In the prior art, canned motorpump does not have gland seal device, and motor and pump are coaxial, utilizes housing that stator, rotor and fed sheet of a media are separated, and self fed sheet of a media is adopted in motor cooling and bearing lubrication, and axle supports and adopts sliding bearing.Canned motorpump is on-stream, when front shroud of impeller, when the back shroud pressure is uneven, will produce axial force, and this axial force acts on the thrust-bearing by rotor assembly.Existing pump shaft has equalizing orifice mode and back blade mode to the equilibrium of forces technology, adopt increasing back sealing ring to separate hyperbaric chamber at the impeller back side, form a low-pressure cavity, bore equalizing orifice or the balance muscle is set near the impeller hub place in low-pressure cavity at the back shroud of impeller place, back shroud liquid homostasis muscle is rotated together, thereby reduce back shroud pressure, play the effect of balancing axial thrust.But prior art can not the complete equilibrium axial force, and remaining axial force causes bigger end thrust backward.Therefore existing canned motorpump all can not be avoided contacting between the thrust face of thrust disc and thrust-bearing effectively, and this can cause the wearing and tearing of thrust-bearing.Simultaneously, in actual use, the proportion of fed sheet of a media, viscosity all exert an influence to the size and Orientation of axial force, and the change of flow also can cause axial force to change, so prior art more can not adapt to the axial force of fluctuation automatically.
Summary of the invention
Technical problem of the prior art to be solved by this invention is: because in the prior art, the axial force balance technology of canned motorpump adopts equalizing orifice mode and back blade mode, can not the complete equilibrium axial force, and remaining axial force causes bigger end thrust backward.Therefore existing canned motorpump all can not be avoided contacting between the thrust face of thrust disc and thrust-bearing effectively, causes the wearing and tearing of thrust-bearing.Simultaneously, in actual use, the proportion of fed sheet of a media, viscosity all exert an influence to the size and Orientation of axial force, and the change of flow also can cause axial force to change, so prior art more can not adapt to the axial force of fluctuation automatically.
The technological scheme that the present invention is adopted for solution above-mentioned technical problem of the prior art provides a kind of improved axial force balancing structure of shielded pump, described this improved axial force balancing structure of shielded pump is by the pump housing, pump shaft, impeller and bearing support constitute, described bearing support is arranged in the described pump housing, be provided with bearing in the described bearing support, described pump shaft is arranged in the described bearing, described impeller set is located on the described pump shaft and is positioned at the place ahead of described bearing support, wherein, the front shroud of described impeller is provided with a cylindrical boss, the shaft axis of described cylindrical boss overlaps with the shaft axis of described pump shaft, the pump housing inboard of described impeller front side is provided with one first cylindrical cavity, the shaft axis of described first cylindrical cavity overlaps with the shaft axis of described cylindrical boss, described cylindrical boss is arranged in described first cylindrical cavity, be provided with first gap between the inwall circumferential surface of the outer peripheral surface of described cylindrical boss and described first cylindrical cavity, the back shroud of described impeller is provided with the cylindric bulge loop of a projection, the shaft axis of described cylindric bulge loop overlaps with the shaft axis of described pump shaft, the pump housing inboard of described impeller rear side is provided with one second cylindrical cavity, the shaft axis of described second cylindrical cavity overlaps with the shaft axis of described cylindric bulge loop, described cylindric bulge loop is arranged in described second cylindrical cavity, be provided with second gap between the inwall circumferential surface of the outer peripheral surface of described cylindric bulge loop and described second cylindrical cavity, end face direction to the back shroud of described impeller on the described bearing support is provided with a bump, is provided with a third space between the end face of the end face of described bump and the back shroud of described impeller.
Further, the distance between described first gap is identical with distance between described second gap.
Further, the shaft axis of the bump on the described bearing support overlaps with the shaft axis of described pump shaft, and the end face of the bump on the described bearing support ringwise.
Further, the end face of the bump on the described bearing support is parallel to the end face of described back shroud of impeller.
Working principle of the present invention is: when axial force increases forward, impeller moves forward, axially the third space that is provided with increases, leakage rate increases, the pressure of back shroud of impeller descends, under the effect of front shroud of impeller pressure, impeller then moves backward, and when axial force increased backward, impeller moved backward, and axially the third space that is provided with reduces, leakage rate reduces, the pressure of back shroud of impeller increases, and under the effect of back shroud of impeller pressure, impeller then moves forward, above process makes impeller reach transient equiliblium, when impeller moved forward or backward, radially the distance in first gap of She Zhiing and second gap was maintained fixed respectively, and fed sheet of a media is flowed by existing pressure.When the flow of fed sheet of a media changes or during the proportion viscosity-modifying of medium, axial force changes, the rotor assembly displacement also can change, but because the effect of axial force automatic balancing, rotor can reach balance in new position, thereby enlarged the operating range of pump, strengthened the adaptability of canned motorpump different medium, different operating modes.
The present invention and prior art contrast, and its effect is actively with tangible.Fixed interval (FI) that utilization of the present invention radially is provided with and the variable gap that axially is provided with constitute hydraulic balance system, can be effectively balancing axial thrust in real time, can reduce pivot friction, improved the bearing working condition, improved the working life of bearing.
Description of drawings
Fig. 1 is the structural representation of improved axial force balancing structure of shielded pump of the present invention.
Embodiment
As shown in Figure 1, improved axial force balancing structure of shielded pump of the present invention is by the pump housing 1, pump shaft 8, impeller 2 and bearing support 3 constitute, described bearing support 3 is arranged in the described pump housing 1, be provided with bearing 4 in the described bearing support 3, described pump shaft 8 is arranged in the described bearing 4, described impeller 2 is set on the described pump shaft 8 and is positioned at the place ahead of described bearing support 3, wherein, the front shroud of described impeller 2 is provided with a cylindrical boss 9, the shaft axis of described cylindrical boss 9 overlaps with the shaft axis of described pump shaft 8, the pump housing 1 inboard of described impeller 2 front sides is provided with one first cylindrical cavity, the shaft axis of described first cylindrical cavity overlaps with the shaft axis of described cylindrical boss 9, described cylindrical boss 9 is arranged in described first cylindrical cavity, be provided with first gap 5 between the inwall circumferential surface of the outer peripheral surface of described cylindrical boss 9 and described first cylindrical cavity, the back shroud of described impeller 2 is provided with the cylindric bulge loop 10 of a projection, the shaft axis of described cylindric bulge loop 10 overlaps with the shaft axis of described pump shaft 8, the pump housing 1 inboard of described impeller 2 rear sides is provided with one second cylindrical cavity, the shaft axis of described second cylindrical cavity overlaps with the shaft axis of described cylindric bulge loop 10, described cylindric bulge loop 10 is arranged in described second cylindrical cavity, be provided with second gap 6 between the inwall circumferential surface of the outer peripheral surface of described cylindric bulge loop 10 and described second cylindrical cavity, end face direction to the back shroud of described impeller 2 on the described bearing support 3 is provided with a bump 11, is provided with a third space 7 between the end face of the back shroud of the end face of described bump 11 and described impeller 2.
In a preferred embodiment of the invention, the distance between described first gap 5 is identical with distance between described second gap 6.
In a preferred embodiment of the invention, the shaft axis of the bump 11 on the described bearing support 3 overlaps with the shaft axis of described pump shaft 8, and the end face of the bump 11 on the described bearing support 3 ringwise.
In a preferred embodiment of the invention, the end face of the bump 11 on the described bearing support 3 is parallel to the end face of described impeller 2 back shrouds.
Claims (4)
1. improved axial force balancing structure of shielded pump, by the pump housing, pump shaft, impeller and bearing support constitute, described bearing support is arranged in the described pump housing, be provided with bearing in the described bearing support, described pump shaft is arranged in the described bearing, described impeller set is located on the described pump shaft and is positioned at the place ahead of described bearing support, it is characterized in that: the front shroud of described impeller is provided with a cylindrical boss, the shaft axis of described cylindrical boss overlaps with the shaft axis of described pump shaft, the pump housing inboard of described impeller front side is provided with one first cylindrical cavity, the shaft axis of described first cylindrical cavity overlaps with the shaft axis of described cylindrical boss, described cylindrical boss is arranged in described first cylindrical cavity, be provided with first gap between the inwall circumferential surface of the outer peripheral surface of described cylindrical boss and described first cylindrical cavity, the back shroud of described impeller is provided with the cylindric bulge loop of a projection, the shaft axis of described cylindric bulge loop overlaps with the shaft axis of described pump shaft, the pump housing inboard of described impeller rear side is provided with one second cylindrical cavity, the shaft axis of described second cylindrical cavity overlaps with the shaft axis of described cylindric bulge loop, described cylindric bulge loop is arranged in described second cylindrical cavity, be provided with second gap between the inwall circumferential surface of the outer peripheral surface of described cylindric bulge loop and described second cylindrical cavity, end face direction to the back shroud of described impeller on the described bearing support is provided with a bump, is provided with a third space between the end face of the end face of described bump and the back shroud of described impeller.
2. improved axial force balancing structure of shielded pump as claimed in claim 1 is characterized in that:
Distance between described first gap is identical with distance between described second gap.
3. improved axial force balancing structure of shielded pump as claimed in claim 1 is characterized in that:
The shaft axis of the bump on the described bearing support overlaps with the shaft axis of described pump shaft, and the end face of the bump on the described bearing support ringwise.
4. improved axial force balancing structure of shielded pump as claimed in claim 2 is characterized in that:
The end face of the bump on the described bearing support is parallel to the end face of described back shroud of impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410084383 CN1779275A (en) | 2004-11-19 | 2004-11-19 | Improved axial force balancing structure of shielded pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410084383 CN1779275A (en) | 2004-11-19 | 2004-11-19 | Improved axial force balancing structure of shielded pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1779275A true CN1779275A (en) | 2006-05-31 |
Family
ID=36769709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410084383 Pending CN1779275A (en) | 2004-11-19 | 2004-11-19 | Improved axial force balancing structure of shielded pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1779275A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291645A (en) * | 2013-05-08 | 2013-09-11 | 江苏大学 | Automatic dynamic axial force balancing structure of hot water circulating pump |
| CN105257547A (en) * | 2015-11-10 | 2016-01-20 | 合肥通用机械研究院 | Long-life efficient multiple-stage centrifugal pump |
| CN105443447A (en) * | 2014-09-24 | 2016-03-30 | 杭州三花研究院有限公司 | Electronic pump |
| CN105443397A (en) * | 2014-09-24 | 2016-03-30 | 杭州三花研究院有限公司 | Electronic pump |
| CN109281861A (en) * | 2018-11-28 | 2019-01-29 | 珠海格力电器股份有限公司 | A kind of axial force automatic balancing device, water pump and air conditioner |
-
2004
- 2004-11-19 CN CN 200410084383 patent/CN1779275A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291645A (en) * | 2013-05-08 | 2013-09-11 | 江苏大学 | Automatic dynamic axial force balancing structure of hot water circulating pump |
| CN103291645B (en) * | 2013-05-08 | 2016-01-20 | 江苏大学 | A kind of hot water circulating pump axial force homeostasis structure |
| CN105443447A (en) * | 2014-09-24 | 2016-03-30 | 杭州三花研究院有限公司 | Electronic pump |
| CN105443397A (en) * | 2014-09-24 | 2016-03-30 | 杭州三花研究院有限公司 | Electronic pump |
| CN105443397B (en) * | 2014-09-24 | 2019-02-12 | 浙江三花汽车零部件有限公司 | Electronic pump |
| CN105443447B (en) * | 2014-09-24 | 2019-03-01 | 浙江三花汽车零部件有限公司 | Electronic pump |
| CN105257547A (en) * | 2015-11-10 | 2016-01-20 | 合肥通用机械研究院 | Long-life efficient multiple-stage centrifugal pump |
| CN105257547B (en) * | 2015-11-10 | 2018-09-21 | 合肥通用机械研究院有限公司 | A kind of long-life high-efficiency multi-stage centrifugal pump |
| CN109281861A (en) * | 2018-11-28 | 2019-01-29 | 珠海格力电器股份有限公司 | A kind of axial force automatic balancing device, water pump and air conditioner |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |