CN207049061U - A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump - Google Patents
A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump Download PDFInfo
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- CN207049061U CN207049061U CN201720360844.6U CN201720360844U CN207049061U CN 207049061 U CN207049061 U CN 207049061U CN 201720360844 U CN201720360844 U CN 201720360844U CN 207049061 U CN207049061 U CN 207049061U
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- impeller
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Abstract
It the utility model is related to pump housing the Hydraulic Design technical field, and in particular to a kind of impeller draw bail of centrifugal multistage pump multiple centrifugal pump.What is distinguished with prior art is, the machining processes reduction less demanding to impeller and axle inner hole precision using be threadedly coupled between impeller and axle, the saving time.Cleverly avoiding interference connection makes impeller dismount facility with axle, increases the service life, be cost-effective.With the use of threaded connection, for multistage middle open formula centrifugal pump in operation process, impeller realizes self-locking with axle by screw thread.For example, first-stage double-absorption, two, three, four, the multistage middle open formula centrifugal pump of Pyatyi single suction, if in terms of driving end pump be dextrorotation to, chopped-off head, two, three-level impeller inner hole thread be left hand thread, four, Pyatyi impeller inner hole thread be right-handed thread.
Description
Technical field
It the utility model is related to pump housing the Hydraulic Design technical field, and in particular to a kind of impeller connection knot of centrifugal multistage pump multiple centrifugal pump
Structure.
Background technology
Multistage middle open formula centrifugal pump extensive use in the different fields such as oil, coal chemical industry, both at home and abroad in most of multistages
Open centrifugal pump impeller leans on key connection with axle.The advantages of key connection is simple in construction, and centering is good, easy to maintenance, recycling,
Shortcoming is can not to bear axial force, key and keyway circular runout, axial float, the damage of long duration that will result in part.And examine
Consider the factor of multistage middle open formula centrifugal pump waterpower and configuration aspects, simply use key connection it is impossible to meet working condition requirement,
Impeller is generally connected with axle using interference in the world.Interference connection is that directly connected piece is linked together using interference fit
Connection is realized, this connection is also known as tight fit connection.The advantages of this connection is simple in construction, and centering is good, bearing capacity
Height, can withstand shocks load, small to the strength reduction of axle, and shortcoming is that assembling is difficult, high to fit dimension required precision, due to tearing open
Opening interference connection needs very big external force, often to damage the matching surface of part in connector, and general interference connection belongs to not
Releasable connection, later period maintenance difficulty are larger.
Utility model content
The utility model provides a kind of leaf for the centrifugal multistage pump multiple centrifugal pump that intensity is high, assembling is convenient, workpiece size precision requirement is low
Attachment structure and its quick despatch method are taken turns, under the conditions of intensity requirement is met, fit dimension precision is reduced, makes multistage middle open formula
Centrifugal pump impeller turns into releasable connection, and the operation that energy is safe and stable, permanent with axle.
Technical scheme is used by the utility model solves its technical problem：
A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump, including rotating shaft and impeller, connected between rotating shaft and impeller using screw thread
Connect.
The impeller is provided with threaded joints I and threaded joints II, is set between threaded joints I and threaded joints II
There are spaced cavities.
At least provided with one stage impeller in the rotating shaft, thread rotary orientation is opposite between adjacent fan-wheel.
The rotating shaft is provided with spacing block, and limiting card block card is buckled in the water inlet end of impeller.
The limiting card is blocked to be bonded provided with packed layer, packed layer with impeller.
The rotating shaft is provided with support block, and support card, which is blocked, opens up groove, and cushion pad is provided with groove.
The beneficial effects of the utility model are：
1st, what is distinguished with prior art is using being threadedly coupled between impeller and axle, to impeller and the requirement of axle inner hole precision
Not high, machining processes are reduced, and save the time.Cleverly avoiding interference connection makes impeller dismount facility with axle, and extension uses the longevity
Order, be cost-effective.With the use of threaded connection, for multistage middle open formula centrifugal pump in operation process, impeller passes through screw thread with axle
Realize self-locking.For example, first-stage double-absorption, two, three, four, the multistage middle open formula centrifugal pump of Pyatyi single suction, if pump is suitable in terms of driving end
Hour hands rotation direction, chopped-off head, two, three-level impeller inner hole thread are left hand thread, four, Pyatyi impeller inner hole thread be right-handed thread.
2nd, impeller is provided with threaded joints I and threaded joints II, and two sections of Design of Screw Thread can not only disperse shaft end stress
Prevent stress raisers and be easy to each portion's fitting rotating shaft of impeller, between being provided between threaded joints I and threaded joints II
Every cavity, reducing difficulty of processing, rotating shaft can be more preferably bonded by forming the independent arm of force simultaneously.It is adjacent at least provided with one stage impeller in rotating shaft
Thread rotary orientation between impeller is on the contrary, stress prevents bias between balancing each impeller.Rotating shaft is provided with spacing block, limiting card block card button
In the water inlet end of impeller.Conveniently install and positioned, limiting card is blocked to be bonded provided with packed layer, packed layer with impeller, is easy to
Design and later maintenance, rotating shaft are provided with support block, and support card, which is blocked, opens up groove, is provided with cushion pad in groove, plays slow
Punching acts on.Impeller both ends are by supporting block and spacing block to realize two-way positioning, more securely and reliably.
The ingenious new multistage middle-open pump impeller that applies to of the principle of bolt and nut in machinery industry is connected with axle in summary
Place is met, strengthens the reliability and compactness of connection using being threadedly coupled with shaft connection place in impeller hub, reduces fit dimension essence
Degree, reduce process for machining process, save the time.Releasable connection operation is easy to maintenance, quick, and structure is simplified attractive in appearance.Simultaneously
Coordinate the greatly convenient installation of quick despatch method and later stage demolition and maintenance.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is partial enlarged drawing I；
Fig. 3 is partial enlarged drawing II.
Embodiment
A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump as shown in the figure, including rotating shaft and impeller, are adopted between rotating shaft and impeller 1
With threaded connection.The impeller 1 is provided with threaded joints I 5 and threaded joints II 6, threaded joints I 5 and threaded joints
Spaced cavities 8 are provided between II 6.At least provided with one stage impeller 1 in the rotating shaft, thread rotary orientation is opposite between adjacent fan-wheel.It is described
Rotating shaft is provided with spacing block 2, and spacing block 2 is buckled in the water inlet end of impeller 1.The spacing block 2 is provided with packed layer 7,
Packed layer 7 is bonded with impeller 1.The rotating shaft is provided with support block 3, supports and groove is opened up on block 3, and buffering is provided with groove
Pad 4.
A kind of impeller linking structure quick despatch method of centrifugal multistage pump multiple centrifugal pump, comprises the following steps：
A, impeller progression is preset
At least provided with one stage impeller 1 in rotating shaft, thread rotary orientation is opposite between adjacent fan-wheel；
B, impeller installation site is preset
Spacing block 2 is installed in rotating shaft, limits impeller installation site；
Impeller is installed C,
Impeller 1 is connected through a screw thread in rotating shaft, impeller 1 is bonded completion installation with spacing block 2；
D, impeller is dismantled
Dismantling impeller 1 and spacing block 2 successively can complete to dismantle.
E, supported between adjacent fan-wheel
Step C connects support block 3 after completing impeller installation in rotating shaft, supports the cushion pad 4 on block 3 to be pasted with impeller
Close.
Multistage middle open formula centrifugal pump impeller uses key connection with axle, and impeller endoporus and six grades of axle precision, roughness precision are
1.6 or higher 0.8, high is required to lathe, if multistage middle open formula centrifugal pump series is higher, machining processes are more, work
When it is longer.Multistage middle open formula centrifugal pump impeller is used with axle and is threadedly coupled, because carrying out screw thread process, impeller to impeller endoporus and axle
Six grades of endoporus and axle precision, roughness can just meet requirement for 3.2, and machining processes are reduced, and save the time.Cleverly keep away simultaneously
Interference connection is opened, impeller is dismounted with axle and facilitates, increase the service life, be cost-effective.With the use of threaded connection, in multistage
For open centrifugal pump in operation process, impeller and axle realize self-locking by screw thread, strengthen the reliability and tightly of impeller and axis connection
Close property.
The torque T 1=KF'd that screw thread need to transmit
D--- screw threads nominal diameter, mm in formula；
F'--- pretightning forces, N；
K--- moment coefficients；
Table one：Moment coefficient K
F'=(0.6~0.7) σ againsAs
σ in formulas--- the yield point of thread material, MPa；
As--- screw thread nominal stress sectional area, mm2；
D in formula1--- external screw thread path, mm；
d2--- pitch diameter of external thread, mm；
d3--- the calculated diameter of screw thread, mm；
The original triangle height of H--- screw threads, mm；
According to multistage middle open pump, torque
P--- pump shaft powers in formula, Kw；
N--- rotating speeds, r/min；
ρ --- pump pumped (conveying) medium density, kg/m3；
G--- acceleration of gravity, m/s2；
The flow of Q--- pumps, m3/h；
The lift of H--- pumps, m；
The efficiency of η --- pump；
The torque T that screw thread need to transmit on design axle1Torque T need to be more than2.
Example explanation
Multistage middle open formula centrifugal pump parameter is as follows：Flow Q=1200m3/ h, lift H=400m, rotating speed n=1450r/
Min, efficiency eta=80%, convey clear water.
It is M160 × 3 (GB/T 196-2003) to take at impeller screw thread, and nominal diameter D160mm, pitch p are 3mm, in screw thread
Footpath d2=158.051mm, diameter of thread d1=156.752mm,
F'=(0.6~0.7) σsAs=σs(74.0719~86.4170) N
T=KF'd multistage middle open pumps precision is high, takes K=0.1
T1=0.1 × σs(74.0719~86.4170) × 100=(7407.19~8641.70) σs
Our 45 the most frequently used steel are chosen, look into GB/T17107-1997,45 steel are after normalizing or normalizing add temper, σs
=360MPa
It is computed, the torque T of screw thread transmission1=2666580.60~3111010.69Nm is much larger than the torsion that pump is transmitted
Square T2=46276.1379Nm.
In summary, it is good using effect is threadedly coupled between multistage middle open formula centrifugal pump impeller and axle.
Claims (5)
1. a kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump, including rotating shaft and impeller, it is characterised in that between rotating shaft and impeller (1)
Using threaded connection；
The impeller (1) is provided with threaded joints I (5) and threaded joints II (6), threaded joints I (5) and threaded joints
Spaced cavities (8) are provided between II (6).
2. a kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that in the rotating shaft at least
Provided with one stage impeller (1), thread rotary orientation is opposite between adjacent fan-wheel.
3. a kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the rotating shaft is provided with
Spacing block (2), spacing block (2) are buckled in the water inlet end of impeller (1).
A kind of 4. impeller linking structure of centrifugal multistage pump multiple centrifugal pump according to claim 3, it is characterised in that the spacing block (2)
Packed layer (7) is provided with, packed layer (7) is bonded with impeller (1).
5. a kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the rotating shaft is provided with
Block (3) is supported, groove is opened up on support block (3), cushion pad (4) is provided with groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720360844.6U CN207049061U (en) | 2017-04-07 | 2017-04-07 | A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720360844.6U CN207049061U (en) | 2017-04-07 | 2017-04-07 | A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump |
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| Publication Number | Publication Date |
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| CN207049061U true CN207049061U (en) | 2018-02-27 |
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| CN201720360844.6U Active CN207049061U (en) | 2017-04-07 | 2017-04-07 | A kind of impeller linking structure of centrifugal multistage pump multiple centrifugal pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4036420A1 (en) * | 2021-01-28 | 2022-08-03 | Sulzer Management AG | A multistage centrifugal pump for pumping fluid, an impeller / shaft assembly and a method for assembling an impeller / shaft |
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2017
- 2017-04-07 CN CN201720360844.6U patent/CN207049061U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4036420A1 (en) * | 2021-01-28 | 2022-08-03 | Sulzer Management AG | A multistage centrifugal pump for pumping fluid, an impeller / shaft assembly and a method for assembling an impeller / shaft |
| WO2022161905A1 (en) * | 2021-01-28 | 2022-08-04 | Sulzer Management Ag | A multistage centrifugal pump for pumping fluid, an impeller / shaft assembly and a method for assembling an impeller / shaft assembly |
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