CN203560137U - Two-stage centrifugal pump - Google Patents
Two-stage centrifugal pump Download PDFInfo
- Publication number
- CN203560137U CN203560137U CN201320709904.2U CN201320709904U CN203560137U CN 203560137 U CN203560137 U CN 203560137U CN 201320709904 U CN201320709904 U CN 201320709904U CN 203560137 U CN203560137 U CN 203560137U
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- impeller
- pump
- axle sleeve
- cavity
- packing
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Abstract
The utility model discloses a two-stage centrifugal pump. The two-stage centrifugal pump comprises a case, a pump shaft, a shaft sleeve, a packing cavity and an impeller, wherein the impeller is rotationally arranged on the pump shaft fixed in the case, ends of the packing cavity are connected with the outer wall of the shaft sleeve, the pump shaft penetrates through the shaft sleeve and the packing cavity, the impeller is in interference fit with the pump shaft, the shaft sleeve is tapered, the thickness of the shaft sleeve wall is 4-9 mm, and the taper of the shaft sleeve is 0.7-1.2. Wall of the tapered shaft sleeve is thinner than that of a traditional round shaft sleeve, so that the abrasion to the shaft sleeve is reduced during usage, and in addition, an abraded round shaft sleeve can be re-machined to be used continuously, so that the cost of spare and accessory parts of the pump is reduced; meanwhile, the tapered shaft sleeve and the packing cavity are matched for usage, so that the power consumption for packing sealing can be reduced, and the improvement on the service efficiency of the centrifugal pump is facilitated.
Description
Technical field
The utility model relates to a kind of centrifugal pump, specifically refers to a kind of double-impeller pump.
Background technique
Centrifugal pump is generally driven by motor, starting before pump, in the pump housing and suction line, is full of liquid.When impeller High Rotation Speed, impeller drives the rotation together of interlobate liquid, and due to the effect of centrifugal force, liquid is thrown toward impeller outer edge (flow velocity can increase to 15～25m/s) from impeller center, and kinetic energy also increases thereupon.When liquid enters after pump case, because the runner in volute shaped pump casing expands gradually, flow rate of liquid reduces gradually, and a part of kinetic energy changes static energy into, so liquid flows out along exhaust port with higher pressure; Meanwhile, impeller center forms certain vacuum because liquid is thrown out of, and the pressure Pa at liquid level place is higher than impeller center, and therefore, the liquid of suction line enters in pump under differential pressure action.Impeller does not stop rotation, and liquid is also continuously inhaled into and extrudes, and because why centrifugal pump can carry liquid, mainly leans on the effect of centrifugal force, therefore be called centrifugal pump.
In centrifugal pump, pump shaft uses condiment sealing conventionally, simple in structure because of it, and detachable maintaining is convenient, and with low cost.But traditional normally cylindrical cavity of centrifugal pump packing seal chamber, exist in actual use larger defect, for the filler of packing cavity the inside, the pressure being subject to hour, extraneous gas can enter into inside cavity, thereby have influence on the startup of centrifugal pump, when centrifugal pump is worked, the high pressure water major part that pumping chamber enters enters the suction chamber of the pump housing from the packing cavity filler space that the inside is stressed less, the filler place of outside is the anhydrous outside that leaks into, cause sealing failure of fillers, reduced the efficiency of centrifugal pump.
Model utility content
The purpose of this utility model is to provide a kind of double-impeller pump, reduces the sealing power consumption of stuffing box, extends pump gland sealed working life, and then improves the efficiency of centrifugal pump.
The purpose of this utility model is achieved through the following technical solutions:
A kind of double-impeller pump, comprise housing, pump shaft, axle sleeve, packing cavity and impeller, wheel rotation is arranged on pump shaft, pump shaft is fixed in housing, and the end of described packing cavity is connected with axle sleeve outer wall, and pump shaft runs through axle sleeve and packing cavity, described impeller and pump shaft interference fit, described axle sleeve is tapered hub, and the thickness of axle sleeve wall is 4 ~ 9 ㎜, and the tapering of axle sleeve is 0.7 ~ 1.2.The utility model is improved to the axle sleeve with tapering by traditional cylinder-shaped sleeve, and the tapering of axle sleeve remains in 0.7 ~ 1.2 scope, can make the contact stress between packing cavity and axle sleeve be uniformly distributed, avoid causing the stress raisers of packing cavity and cause packing cavity seal failure, extend the working life of packing cavity, and the thickness of the axle sleeve wall of tapered hub is 4 ~ 9 ㎜, thinner than traditional circular shaft jacket wall, the wearing and tearing of using process Intermediate shaft sleeve are reduced, and can reprocess rear continuation for the round sleeve having worn and torn uses, reduce the expense of pump housing Component, being used in conjunction with of tapered hub and packing cavity, can effectively reduce gland sealed power consumpiton simultaneously, is beneficial to the utilization efficiency that improves centrifugal pump.
Described impeller comprises wheel disc, described wheel disc rotates and is arranged on pump shaft, described wheel disc is provided with rotational symmetric 3 linear leafs, in leaf groove between two adjacent linear leafs, be provided with short blade, described linear leaf and short blade are along wheel disc radial radiation, described short blade outlet laying angle is 40 ° ~ 44 °, and the inlet diameter of short blade is 0.4 ~ 0.6 with the ratio of wheel disc external diameter.The utility model not only considers to reduce squeezing and the friction of blade surface of blade, the runner that also will consider wheel disc upper blade has enough length, to guarantee the stability of flow of fluid and the abundant effect of blade convection cell, therefore adopt 3 linear leafs, in leaf groove between adjacent linear leaf, short blade is set, can wash away wake flow, more effectively prevent generation and the development of wake flow, improved the correction factor of blade, and then increase centrifugal lift of pump, improved velocity flow profile, improved centrifugal pump performance, wherein short blade outlet laying angle is within the scope of 40 ° ~ 44 °, the inlet diameter of short blade is 0.4 ~ 0.6 with the ratio of wheel disc external diameter, can make centrifugal lift of pump and efficiency reach best level, reached the object that improves efficiency of centrifugal pump.
Described packing cavity comprises cavity, packing ring and gland, cavity and gland, pump shaft and axle sleeve outer wall form a confined space, gland is fixedly installed in housing, one end of cavity is connected with gland, the other end of cavity is connected with axle sleeve outer wall, packing ring is placed in confined space, in described packing ring, is provided with graphite packing.During centrifugal pump work, thereby filler is subject to the frictional force of the axial pressing force generation of gland causes impacting force to reduce gradually vertically, the radial compaction power producing makes graphite packing be close to axle surface simultaneously, stop medium to outward leakage, the distribution of radial compaction power is to be tended towards stability after the outer wall of axle sleeve sharply successively decreases before this by gland, and the pressure distribution of medium is to be successively decreased to gland by axle sleeve outer wall, when the pressure medium at gland place is zero, medium, without leakage, has guaranteed the good seal performance of packing cavity.
On described wheel disc, also have equalizing orifice.The equalizing orifice having on wheel disc can make the pressure balance before and after wheel disc, keeps slow-roll stabilization, reduces vibration, guarantees the working efficiency of centrifugal pump.
The outlet laying angle of described linear leaf is 35 ° ~ 40 °.Mostly the angle of the outlet laying angle of general blade is lower than 90 °, low speed than centrifugal pump in, for reducing the wearing and tearing of pump, often select larger outlet laying angle, but outlet laying angle is larger, and interlobate runner is more bending, and runner can shorten, cause the angle of flare between adjacent blades to become large, cause hydraulic loss to increase; The outlet laying angle of linear leaf is set to 35 ° ~ 40 °, can guarantee the runner of larger width, reduces the loss of waterpower.
Described packing ring is CPVC Pall ring.CPVC Pall ring full name is chlorinated polyvinyl chloride plastic Pall ring, there is empty gap rate large, height of transfer unit is low, the feature that mass-transfer efficiency is high, do not increasing under the long-pending condition of filling surface, greatly improving the mobility status of gas-liquid two-phase in packing layer, improving fluid mechanics and the mass-transfer performance of filler, improve the efficiency that packing cavity seals in to the pump housing, reduced the wearing and tearing of packing cavity.
The utility model compared with prior art, has following advantage and beneficial effect:
1, a kind of double-impeller pump of the utility model, comprise housing, pump shaft, axle sleeve, packing cavity and impeller, wheel rotation is arranged on pump shaft, pump shaft is fixed in housing, and the end of described packing cavity is connected with axle sleeve outer wall, and pump shaft runs through axle sleeve and packing cavity, described impeller and pump shaft interference fit, described axle sleeve is tapered hub, and the thickness of axle sleeve wall is 4 ~ 9 ㎜, and the tapering of axle sleeve is 0.7 ~ 1.2; Tapered hub is thinner than traditional circular shaft jacket wall, and the wearing and tearing of using process Intermediate shaft sleeve are reduced, and can reprocess rear continuation for the round sleeve having worn and torn and use, and reduces the expense of pump housing Component; Being used in conjunction with of tapered hub and packing cavity, can effectively reduce gland sealed power consumpiton simultaneously, is beneficial to the utilization efficiency that improves centrifugal pump;
2, a kind of double-impeller pump of the utility model, impeller comprises wheel disc, described wheel disc rotates and is arranged on pump shaft, described wheel disc is provided with rotational symmetric 3 linear leafs, in leaf groove between two adjacent linear leafs, be provided with short blade, described linear leaf and short blade are along wheel disc radial radiation, and described short blade outlet laying angle is 40 ° ~ 44 °, and the inlet diameter of short blade is 0.4 ~ 0.6 with the ratio of wheel disc external diameter; Wherein short blade outlet laying angle is within the scope of 40 ° ~ 44 °, and the inlet diameter of short blade is 0.4 ~ 0.6 with the ratio of wheel disc external diameter, can make centrifugal lift of pump and efficiency reach best level, has reached the object that improves efficiency of centrifugal pump;
3, a kind of double-impeller pump of the utility model, the outlet laying angle of linear leaf is 35 ° ~ 40 °, mostly the angle of the outlet laying angle of general blade is lower than 90 °, low speed than centrifugal pump in, the outlet laying angle of linear leaf is set to 35 ° ~ 40 °, can guarantee the runner of larger width, reduce the loss of waterpower.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the utility model embodiment, forms the application's a part, does not form the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is the utility model structural representation;
Fig. 2 is the structural representation of impeller;
Mark and corresponding component title in accompanying drawing:
The outlet laying angle of 1-wheel disc, 2-short blade, 3-linear leaf, 4-linear leaf, 5-short blade outlet laying angle, 6-pump shaft, 7-equalizing orifice, 8-housing, 9-impeller, 10-axle sleeve, 11-cavity, 12-gland, 13-packing ring, 14-graphite packing.
Embodiment
For making the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, exemplary embodiment of the present utility model and explanation thereof are only for explaining the utility model, and conduct is not to restriction of the present utility model.
Embodiment
As depicted in figs. 1 and 2, a kind of double-impeller pump of the utility model, comprise housing 8, pump shaft 6, axle sleeve 10, packing cavity and impeller 9, impeller 9 rotates and is arranged on pump shaft 6, and pump shaft 6 is fixed in housing 1, the end of described packing cavity is connected with axle sleeve 10 outer walls, pump shaft 6 runs through axle sleeve 10 and packing cavity, described impeller 9 and pump shaft 6 interference fit, and described axle sleeve 10 is tapered hub, the thickness of axle sleeve wall is 4 ~ 9 ㎜, and the tapering of axle sleeve 10 is 0.7 ~ 1.2; Described packing cavity comprises cavity 11, packing ring 13 and gland 12, cavity 11 forms a confined space with gland 12, pump shaft 6 and axle sleeve 10 outer walls, gland 12 is fixedly installed in housing 1, one end of cavity 11 is connected with gland 12, the other end of cavity 11 is connected with axle sleeve 10 outer walls, packing ring 13 is placed in confined space, in described packing ring 13, is provided with graphite packing 14.During centrifugal pump work, thereby filler 14 is subject to the frictional force of the axial pressing force generation of gland 12 causes impacting force to reduce gradually vertically, the radial compaction power producing makes graphite packing be close to axle surface simultaneously, stop medium to outward leakage, the distribution of radial compaction power is to be tended towards stability after the outer wall of axle sleeve 10 sharply successively decreases before this by gland 12, and the pressure distribution of medium is to be successively decreased to gland 12 by axle sleeve 10 outer walls, when the pressure medium at gland 12 places is zero, medium, without leakage, has guaranteed the good seal performance of packing cavity.The utility model is improved to the axle sleeve 10 with tapering by traditional cylinder-shaped sleeve, and the tapering of axle sleeve 10 remains in 0.7 ~ 1.2 scope, can make the contact stress between packing cavity and axle sleeve 10 be uniformly distributed, avoid causing the stress raisers of packing cavity and cause packing cavity seal failure, extend the working life of packing cavity, and the thickness of the axle sleeve wall of tapered hub is 4 ~ 9 ㎜, thinner than traditional circular shaft jacket wall, the wearing and tearing of using process Intermediate shaft sleeve 10 are reduced, and can reprocess rear continuation for the round sleeve having worn and torn uses, reduce the expense of pump housing Component, being used in conjunction with of tapered hub and packing cavity, can effectively reduce gland sealed power consumpiton simultaneously, is beneficial to the utilization efficiency that improves centrifugal pump,
Wherein, described impeller comprises wheel disc 1, described wheel disc 1 rotates and is arranged on pump shaft 2, described wheel disc 1 is provided with rotational symmetric 3 linear leafs 3, in leaf groove between two adjacent linear leafs 3, be provided with short blade 2, described linear leaf 3 is with short blade 2 along wheel disc 1 radial radiation, and described short blade outlet laying angle 5 is 40 ° ~ 44 °, and the outlet laying angle 4 of described linear leaf is 35 ° ~ 40 °.The utility model not only considers to reduce squeezing and the friction of blade surface of blade, the runner that also will consider wheel disc 1 upper blade has enough length, to guarantee the stability of flow of fluid and the abundant effect of blade convection cell, therefore adopt 3 linear leafs 3, in leaf groove between adjacent linear leaf 3, short blade 2 is set, can wash away wake flow, more effectively prevent generation and the development of wake flow, improved the correction factor of blade, and then increase centrifugal lift of pump, improved velocity flow profile, improved centrifugal pump performance, mostly the angle of the outlet laying angle of general blade is lower than 90 °, low speed than centrifugal pump in, for reducing the wearing and tearing of pump, often select larger outlet laying angle, but outlet laying angle is larger, interlobate runner is more bending, runner can shorten, cause the angle of flare between adjacent blades to become large, cause hydraulic loss to increase, the outlet laying angle 4 of linear leaf is set to 35 ° ~ 40 °, can guarantee the runner of larger width, reduces the loss of waterpower, short blade outlet laying angle 5 is within the scope of 40 ° ~ 44 °, and the inlet diameter of short blade 2 is 0.4 ~ 0.6 with the ratio of wheel disc 1 external diameter, can make centrifugal lift of pump and efficiency reach best level, has reached the object that improves efficiency of centrifugal pump.
Above-described embodiment; the purpose of this utility model, technological scheme and beneficial effect are further described; institute is understood that; the foregoing is only embodiment of the present utility model; and be not used in limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. a double-impeller pump, comprise housing (8), pump shaft (6), axle sleeve (10), packing cavity and impeller (9), impeller (9) rotates and is arranged on pump shaft (6), pump shaft (6) is fixed in housing (8), it is characterized in that: the end of described packing cavity is connected with axle sleeve (10) outer wall, pump shaft (6) runs through axle sleeve (10) and packing cavity, described impeller (9) and pump shaft (6) interference fit, described axle sleeve (10) is tapered hub, the thickness of axle sleeve wall is 4 ~ 9 ㎜, and the tapering of axle sleeve (10) is 0.7 ~ 1.2.
2. a kind of double-impeller pump according to claim 1, it is characterized in that: described impeller comprises wheel disc (1), described wheel disc (1) rotates and is arranged on pump shaft (6), described wheel disc (1) is provided with rotational symmetric 3 linear leafs (3), in leaf groove between adjacent two linear leafs (3), be provided with short blade (2), described linear leaf (3) and short blade (2) are along wheel disc (1) radial radiation, described short blade outlet laying angle (4) is 40 ° ~ 44 °, and the ratio of the inlet diameter of short blade (2) and wheel disc (1) external diameter is 0.4 ~ 0.6.
3. a kind of double-impeller pump according to claim 1, it is characterized in that: described packing cavity comprises cavity (11), packing ring (13) and gland (12), gland (12) is fixedly installed in housing (8), cavity (11) forms a confined space with gland (12), pump shaft (6) and axle sleeve (10) outer wall, one end of cavity (11) is connected with gland (12), the other end of cavity (11) is connected with axle sleeve (10) outer wall, packing ring (13) is placed in confined space, is provided with graphite packing (14) in described packing ring (13).
4. a kind of double-impeller pump according to claim 2, is characterized in that: on described wheel disc (1), also have equalizing orifice (7).
5. a kind of double-impeller pump according to claim 2, is characterized in that: the outlet laying angle (5) of described linear leaf (3) is 35 ° ~ 40 °.
6. a kind of double-impeller pump according to claim 3, is characterized in that: described packing ring (13) is CPVC Pall ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320709904.2U CN203560137U (en) | 2013-11-12 | 2013-11-12 | Two-stage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320709904.2U CN203560137U (en) | 2013-11-12 | 2013-11-12 | Two-stage centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203560137U true CN203560137U (en) | 2014-04-23 |
Family
ID=50509862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320709904.2U Expired - Fee Related CN203560137U (en) | 2013-11-12 | 2013-11-12 | Two-stage centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203560137U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806562A (en) * | 2015-04-08 | 2015-07-29 | 华中科技大学 | Impeller fixing method for micro-rotating mechanical pump |
| CN109630472A (en) * | 2018-11-29 | 2019-04-16 | 中国农业大学 | The centrifugal pump of suppression cavitation surge |
-
2013
- 2013-11-12 CN CN201320709904.2U patent/CN203560137U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806562A (en) * | 2015-04-08 | 2015-07-29 | 华中科技大学 | Impeller fixing method for micro-rotating mechanical pump |
| CN104806562B (en) * | 2015-04-08 | 2017-12-22 | 华中科技大学 | The impeller fixed structure and fixing means of a kind of miniature rotating machinery pump |
| CN109630472A (en) * | 2018-11-29 | 2019-04-16 | 中国农业大学 | The centrifugal pump of suppression cavitation surge |
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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: 20140423 Termination date: 20141112 |
|
| EXPY | Termination of patent right or utility model |