CN106402031B - A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port - Google Patents
A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port Download PDFInfo
- Publication number
- CN106402031B CN106402031B CN201610858533.2A CN201610858533A CN106402031B CN 106402031 B CN106402031 B CN 106402031B CN 201610858533 A CN201610858533 A CN 201610858533A CN 106402031 B CN106402031 B CN 106402031B
- Authority
- CN
- China
- Prior art keywords
- return port
- section
- pump
- impeller
- cross
- 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.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/004—Priming of not self-priming pumps
- F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/004—Priming of not self-priming pumps
- F04D9/006—Priming of not self-priming pumps by venting gas or using gas valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port, the first return port and the second return port are located at the symmetrical two sides in impeller middle section；Spiral case inner cavity is connected to by the first return port with the right side of gas-liquid separation chamber, and spiral case inner cavity passes sequentially through the second return port, pump cover through-hole, diversion pipe, drainage hole and is connected to the left side of gas-liquid separation chamber；The distance between the right-end openings of first return port and impeller middle section and the left end of the second return port opening are equal with the distance between impeller middle section；The shape of the cross section of first return port and the cross section of the second return port is ellipse.The midpoint of the return port position line is located in the plane where impeller middle section, the radial direction for defining the impeller middle section where midpoint is that position is radial, and the short axle direction of the short axle direction of the first return port cross section and the second return port cross section is radially parallel with position.
Description
Technical field
The present invention relates to a kind of exterior mixing self-priming centrifugal pumps equipped with symmetrical return port.
Background technique
External-mix self-priming pump belongs to one kind of centrifugal pump, because of its good self-priming performance and job stability, widely answers
For fields such as agricultural drainage and irrigation, municipal blowdown, petrochemical industry metallurgy and food chemistries.Compared with Ordinary Centrifugal Pumps, on the self priming pump pump housing
There is reflux pore structure.When return port can guarantee self-priming pump startup, liquid reflux is introduced into spiral case, mixes gas-liquid sufficiently
It closes, gas-liquid mixed discharge spiral case is entered gas-liquid separation chamber by impeller acting, and gas is discharged along outlet, and the biggish liquid of specific gravity is then
Separation chamber bottom is sunk to, turns again to spiral case through return port, with gas mixing, so circulation is until draining in intake line
Gas, to realize self-priming.
But after self priming pump normal work, the reflux effect of pump housing upper return port seriously affects the flowing in spiral case
State, under the reflux and the comprehensive function of impeller-spiral case stator-rotor interaction of return port, the flowing in spiral case is increasingly complex.Through returning
The liquid that discharge orifice flows back into spiral case has upset in spiral case symmetrically fluidal texture, makes to generate the period at any time in spiral case section
The unilateral vortex motion structure of variation, this flow regime not only cause hydraulic loss in spiral case to increase, can also induce serious pressure
Power pulsation, causes unit vibration and noise.And due to its impact of unilateral side reflux to impeller, axial force of impeller can significantly increase
Greatly, the service life of bearing is seriously reduced, while making impeller that axial float occur, it is more likely that impeller port ring is caused to wear.
Summary of the invention
To solve the above technological deficiency, the present invention proposes a kind of exterior mixing self-priming centrifugal pump pump housing equipped with symmetrical return port
Structure makes two side reflux of spiral case, and regurgitant volume is identical, its role is to improve the flow regime in spiral case, makes to generate in spiral case
The metastable fluidal texture for being symmetrical with impeller middle section reduces pressure fluctuation, and symmetrically return to reduce hydraulic loss
Axial force of impeller caused by flowing can cancel out each other, and substantially increase the stability and reliability of self priming pump operating.
The technical scheme is that
A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port, it is characterised in that: the centrifugal pump being vertically arranged includes
The pump housing in left side and the pump cover on right side, the pump housing are arranged on horizontal pump bracket, and the pump housing is equipped with suction chamber and the draining of water inlet
Pump discharge, impeller, spiral case and gas-liquid separation chamber are equipped in the pump housing, and impeller is arranged in spiral case；Pump shaft runs through pump cover, pump shaft
Left end extend in spiral case, impeller is fixed on the left end of pump shaft, and the right end of pump shaft is connected with the output shaft of motor；Suction chamber
It is connected with the entrance of impeller, the outlet of impeller is connected with volute inlet, and the outlet of spiral case is connected with gas-liquid separation chamber, gas
Liquid separation chamber passes through pump discharge to exterior liquid；
The first return port and the second return port are provided on the spiral case, the first return port and the second return port are located at leaf
Take turns the symmetrical two sides in middle section；Spiral case inner cavity is connected to by the first return port with the right side of gas-liquid separation chamber, and spiral case inner cavity is successively
It is connected to by the second return port, pump cover through-hole, diversion pipe, drainage hole with the left side of gas-liquid separation chamber, pump cover through-hole is provided with pump
It covers, drainage hole is provided in gas-liquid separation chamber；The right-end openings of first return port are connected with spiral case inner cavity, the second return port
Left end opening is connected with spiral case inner cavity, and the distance between the right-end openings of the first return port and impeller middle section and the second reflux
The left end opening in hole is equal with the distance between impeller middle section；The impeller middle section refers to impeller along axial center
Place cross section；The shape of the cross section of first return port and the cross section of the second return port is ellipse；
With the center of circle of the cross section where the right-end openings of the first return port for first center of circle, with the left end of the second return port
The center of circle of cross section where being open is second center of circle, and the line for defining first center of circle and second center of circle is the return port position line,
Then the midpoint of the return port position line is located in the plane where impeller middle section, defines the impeller middle section where the midpoint
Radial is that position is radial, then the short axle place side of the short axle direction of the first return port cross section and the second return port cross section
Position described in Xiang Junyu is radially parallel；
The length of the short axle of first return port cross section is the 40%~60% of long axis length, the cross section of the second return port
The length of short axle be the 40%~60% of long axis length；
Area of the area of the cross section of second return port less than the cross section of the first return port.
Further, the cross-sectional area of the first return portSecond reflux
The area of the cross section in holeN is the rated speed of pump, unit r/min in formula；
D2For 4 outer diameter of impeller, unit m；QdFor the flow of pump, unit m3/h；D is the diameter of diversion pipe, unit m, d=
1.2dk1, dk1For the equivalent diameter of the first return port 9；L is the length of diversion pipe 10, unit m；δ is the axis of the second return port 8
To length, unit m；θ is cut water along impeller direction of rotation to the radian at return port center, 3.3~3.8rad of value range；λ
For the frictional resistant coefficient of diversion pipe.
Further, the suction chamber is S-shaped along the vertical direction, and the entrance of suction chamber is connected by intake line and external source
Logical, the outlet of suction chamber is connected to the entrance of impeller, and the central axes of suction chamber inlet cross section are higher than the outlet of spiral case.
Further, the center of circle of the cross section of the first return port, the second return port, pump cover through-hole and drainage hole is in same level
On line, with the influence of ignoring position energy.
Further, the central axes of the pump discharge and the central axes of volute outlet coincide.
Further, the angle theta of cut water and the return port position line along impeller direction of rotation is 3.3~3.8rad.
The beneficial effects of the present invention are:
1. two sides of the present invention are symmetrically flowed back, the asymmetry quantum dot structure of mechanical periodicity at any time in spiral case, two sides are changed
Symmetrical reflux tends to the fluidal texture in spiral case symmetrically, and flow regime in the improvement spiral case of high degree especically reduces snail
Vortex motion structure in shell reduces hydraulic loss.
2. two sides of the present invention are symmetrically flowed back, it is distributed the pressure in spiral case more uniform, while improving in spiral case section
Mechanical periodicity at any time asymmetric Secondary Flow, can reduce pressure fluctuation, improve pump operation stability.
3. two sides of the present invention are symmetrically flowed back, impacting axial force of impeller caused by impeller can cancel out each other, with the prior art
Axial force of impeller compared to substantially reducing, the influence to bearing and mechanical seal can be reduced, increase its service life, avoid simultaneously
Harm brought by impeller axial float.
4 present invention are drained by the way of diversion pipe, easy to use, low in cost, are reaching the same of symmetrical reflux purpose
When there is no increase pump body structure complexity, not will increase its cast difficulty.
5. the present invention saves import check valve in such a way that suction chamber import and volute outlet guarantee certain altitude difference
Installation, not only reduced costs, but also the external characteristics of pump can be improved.
Detailed description of the invention
Fig. 1 is cross-sectional view of the invention.
Fig. 2 is structure enlargement diagram at B in Fig. 1.
Fig. 3 is structure enlargement diagram at C in Fig. 1.
Fig. 4 is the first reflux hole site schematic shapes.
Fig. 5 is isometric side view of the invention.
Fig. 6 a be the prior art exterior mixing self-priming centrifugal pump at return port spiral case section motion pattern；
Fig. 6 b is the section motion pattern of present invention spiral case at the first return port and the second return port.
Fig. 7 is exterior mixing self-priming centrifugal pump and the present invention pressure fluctuation time domain pair in spiral case at the return port of the prior art
Than figure, the longitudinal axis Cp in figure is the characteristic of pressure fluctuation.
Fig. 8 is exterior mixing self-priming centrifugal pump and the present invention pressure fluctuation frequency domain pair in spiral case at the return port of the prior art
Than figure, the longitudinal axis Cp in figure is the characteristic of pressure fluctuation.
Fig. 9 is the exterior mixing self-priming centrifugal pump and axial force of impeller comparison diagram of the invention of the prior art.
In figure: the 1- pump housing, 2- suction chamber, 3- spiral case, 4- impeller, 5- flat key, 6- the impeller nut, (storage of 7- gas-liquid separation chamber
Liquid chamber), the second return port of 8-, the first return port of 9-, 10- diversion pipe, 11- pump bracket, 12- gas vent, 13- pump discharge, 14- snail
Shell outlet, 15- pump cover, the first bolt of 16-, the second bolt of 18-, 21- third bolt, 19- front axle pressure cap, 20- rear axle pressure-bearing
Lid, 22- pump shaft, 23- heel row bearing, 24, the front row 25- bearing, 26- rubber ring, 27- mechanical seal, 28- pump cover through-hole, 29- connect
Connector, 30- fastening nut, 31- washer, 32- cut water.
Specific embodiment
As shown, a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port, the centrifugal pump being vertically arranged includes a left side
The pump housing 1 of side and the pump cover 15 on right side, the pump housing 1 are arranged on horizontal pump bracket 11, and the pump housing 1 is equipped with the suction chamber 2 of water inlet
With the pump discharge 13 of draining, the pump housing 1 is interior to be equipped with impeller 4, spiral case 3 and gas-liquid separation chamber 7, and impeller 4 is arranged in spiral case 3；Pump
Axis 22 runs through pump cover 15, and the left end of pump shaft 22 extends in spiral case 3, and impeller 4 is fixed on the left end of pump shaft 22, the right side of pump shaft 22
End is connected with the output shaft of motor；Suction chamber 2 is connected with the entrance of impeller 4, and the outlet of impeller 4 is connected with 3 entrance of spiral case,
The outlet of spiral case 3 is connected with gas-liquid separation chamber 7, and gas-liquid separation chamber 7 passes through pump discharge 13 to exterior liquid；
The first return port 9 and the second return port 8, the first return port 9 and the second return port 8 difference are provided on the spiral case 3
Positioned at the symmetrical two sides in impeller middle section；3 inner cavity of spiral case is connected to by the first return port 9 with the right side of gas-liquid separation chamber 7, spiral case
3 inner cavities pass sequentially through the second return port 8, pump cover through-hole 28, diversion pipe 10, drainage hole and are connected to the left side of gas-liquid separation chamber 7, pump
Lid through-hole 28 is provided on pump cover 15, and drainage hole is provided in gas-liquid separation chamber 7；The right-end openings and spiral case 3 of first return port 9
Inner cavity is connected, and the left end opening of the second return port 8 is connected with 3 inner cavity of spiral case, and in the right-end openings and impeller of the first return port 9
The distance between section and the left end of the second return port 8 opening are equal with the distance between impeller middle section；In the impeller
Section refer to impeller 3 along axial center place cross section；The cross section of first return port 9 and the second return port 8
The shape of cross section is ellipse.
With the center of circle of the cross section where the right-end openings of the first return port 9 for first center of circle, with a left side for the second return port 8
The center of circle of cross section where end opening is second center of circle, and the line for defining first center of circle and second center of circle is reflux hole site
Line, then the midpoint of the return port position line is located in the plane where impeller middle section, defines and cuts in the impeller where the midpoint
The radial direction in face is that position is radial, then the short axle of 8 cross section of the short axle direction of 9 cross section of the first return port and the second return port
Direction is radially parallel with the position.
The short axle and position radial direction phase of 8 cross section of short axle direction and the second return port of first return port, 9 cross section
In parallel, the first return port 9 and two return ports, 8 aperture be can reduce to concentrate 3 bring stress of spiral case, reflux can also be reduced to snail
The influence of mainstream in shell 3.Since there are certain energy losses in drainage process for diversion pipe 10, to guarantee the first return port 9
It is identical with the regurgitant volume of the second return port 8, the cross section of the area outline of the cross section of the second return port less than the first return port
Area, and when the first return port 9 cross-sectional area Second return port
Cross section area When can guarantee returning for the first return port 9 and the second return port 8
Flow is identical, and n is the rated speed of pump, unit r/min in formula；D2For impeller outer diameter, unit m；QdFor the stream of pump
Amount, unit m3/h；D is the diameter of diversion pipe, unit m；D=1.2dk1, dk1For the equivalent diameter of the first return port 9；L is
The length of diversion pipe 10, unit m；δ is the axial length of the second return port 8, unit m；θ is cut water along impeller direction of rotation
To the radian at return port center, value range is between 3.3~3.8rad；λ is diversion pipe frictional resistant coefficient.
Two sides of the present invention are symmetrical arranged the first return port and the second return port, change in spiral case mechanical periodicity at any time
Asymmetry quantum dot structure, two sides, which are symmetrically flowed back, tends to the fluidal texture in spiral case symmetrically, stream in the improvement spiral case of high degree
Dynamic state, especically reduces the vortex motion structure in spiral case, reduces hydraulic loss.Especially when two sides, symmetrical regurgitant volume is equal
When, symmetrical reflowing result is more obvious.
But since water flow can have energy loss, the cross-sectional area A of the second return port 8 in diversion pipe 10k2It can not be straight
Connect the cross-sectional area A equal to the first return port 9k1, and the area of the cross section of the second return port 8 is less than the cross of the first return port 9
The area in section.
If it is desired to obtain Ak2, energy loss caused by calculating diversion pipe 10 is first had to, to pass through the conservation of energy and the conservation of mass
Law seeks Ak2And Ak1.It defines hydraulic for lateral pressure, definition close first at the first return port 9 and the second return port 8
Liquid mean flow rate at return port 9 or the second return port 8 is side speed, then 7 inside pressure of gas-liquid separation chamber is P1, liquid separation
7 inside speed of room is v1；3 inside pressure of spiral case is Pv, 3 inside speed of spiral case is vv；Liquid mean flow rate in first return port 9
For vk1.It is as follows to 9 two sides column Bernoulli equation of the first return port first:
Wherein, ξ1It is the resistance coefficient of the first return port 9, ρ is the density of liquid, g=9.8N/kg.
According to the cross-sectional area A of the first return port 9k1And its shape determines 10 diameter d of diversion pipe, takes d=1.2dk1, dk1For
The equivalent diameter of first return port 9, water conservancy diversion length of tube L are determined according to the size of the pump housing.If liquid mean flow rate in diversion pipe 10
For v, liquid mean flow rate is v in the second return port 8k2, the equivalent diameter d of the second return port 8k2.Define diversion pipe 10 and pump cover
The connected one end of through-hole 28 is diversion pipe import, and defining one end that the second return port 8 is connected with pump cover through-hole 28 is the second reflux
Hole exits, to 10 import of diversion pipe and the second reflux hole exits column Bernoulli equation:
Wherein, ξ2For the resistance coefficient of draft tube outlets and 28 junction of pump cover through-hole；ξ3It exports and hinders for the second return port 8
Force coefficient；λ is diversion pipe frictional resistant coefficient；Due to d at this timek2It is unknown, it is considerably complicated to solve equation (2), it is contemplated that dk2With d ruler
It is very little close, therefore approximatively take dk2=d.
If the regurgitant volume of the first return port 9 and the second return port 8 is equal, had by the conservation of mass:
vk1·Ak1=vk2·Ak2 (3)
By 9 flow velocity v of the first return portk1, liquid viscosity coefficient calculates Reynolds in 10 diameter d of diversion pipe and diversion pipe 10
Number is consulted frictional resistant coefficient λ in the available diversion pipe 10 of Moody chart further according to Reynolds number size, is inquired in fluid handbook
Coefficient of partial resistance table obtains: ξ1=0.06, ξ2=0.07, ξ3=1, after formula (1) (2) are substituted into formula (3), according to pressure
From linear increase rule of the cut water to from return port, then by ξ1=0.06, ξ2=0.07, ξ3=1 brings into and solves:
The prior art is (referring to document: the budget of instrument group's external-mix self-priming pump reflux hole area and the determination " irrigation and drainage of parameter
Mechanical engineering journal ", the 1992, the 1st phase, page 1~5) disclosed in return port calculation formula are as follows:
Ak=(0.95~2.54) (n/Q)2/3 (4)
But formula (4) is only applicable to the case where calculating and setting single return port, and 0.95~2.54 value range phase
Difference is also larger, and does not consider the influence of geometric parameter D2.The present invention is equipped with the first return port 9 and the second return port 8 two are returned
Discharge orifice, formula (4) are simultaneously not suitable for.
Therefore, it is necessary to be modified on the basis of formula (4) to the formula, related coefficient is adjusted, obtaining can be accurate
Calculate the formula of the cross-sectional area of the first return port 9.Wherein, the first return port size Ak1Mainly with parameter D2、QdWith n phase
It closes, calculates by dimensional analysis and parameters weighing factor it is found that Ak1Mainly with parameter D2、QdIt is related to n, by dimension
Analysis and parameters weighing factor calculate, Ak1With n-0.62、 It is directly proportional, it is transversal when the first return port 9
AreaWhen, the first return port 9 is guaranteeing flow and effect when the invention works
Under the premise of rate, moreover it is possible to meet self-priming performance and suction lift.
The length of the short axle of first return port, 9 cross section is the 40%~60% of long axis length, the second return port 8 it is transversal
The length of the short axle in face is the 40%~60% of long axis length.The length range of short axle is controlled with this, if the first return port 9 and
Two return ports 8 are oversized along its cross section short-axis direction, and spiral case at the first return port 9 and the second return port 8 can be made transversal
Large area is affected in face, increases hydraulic loss.
The angle theta of cut water and the return port position line along impeller direction of rotation is 3.3~3.8rad, and according to this field, scholar is more
Year practical studies, the return port position line within this range when the self-priming performance that pumps it is best.
The suction chamber 2 is S-shaped along the vertical direction, and the entrance of suction chamber 2 is connected to by intake line with external source, inhales
The outlet of water chamber 2 is connected to the entrance of impeller 4, and the central axes of 2 inlet cross section of suction chamber are higher than the outlet of spiral case 14.
The center of circle of the cross section of first return port 9, the second return port 8, pump cover through-hole 28 and drainage hole is in same horizontal line
On, with the influence of ignoring position energy.
The central axes that the central axes of the pump discharge 13 are exported with spiral case 14 coincide, to guarantee liquid smoothly by pump discharge
Outside 13 efflux pumps, reduce hydraulic loss.
When the present invention operates, the effect of diversion pipe 10 is drained to the second return port 8, improves flow regime in spiral case；Stop
When needing to drain after pump or dismounting maintenance, the connection of diversion pipe 10 Yu pump cover 15 is unloaded, it can drain.
Pump cover 15 not only plays the sealing function of traditional pump cover, and the pump cover through-hole 28 being arranged thereon can connection diversion pipe
With the second return port 8.First boss is reserved for pump cover through-hole 28 in production, at the same pump housing 1 and 15 cooperation of pump cover
Second boss is reserved, the second return port 8 is got through at second boss.
The bearing body 17 is connected with pump cover 15, and the location dimension that bearing body 17 cooperates with pump cover 15 cannot be excessive, to give
28 reserved space surplus of pump cover through-hole.
The pump housing 1 is connected with pump cover 15 by the first bolt 16, and pump cover 15 and bearing body 17 pass through 18 phase of the second bolt
Even；Impeller 4 is located in spiral case 3, and the impeller 4 is connected in the left end of pump shaft 22 by flat key 5 and impeller nut 6；The machinery
Sealing 27 is located between impeller 4 and pump cover 15, and the mechanical seal 27 is connected on pump shaft 22；Before being equipped in the bearing body 17
Bearing 24,25 and heel row bearing 23 are arranged, the front row bearing 24,25 and heel row bearing 23 are separately fixed at 22 shaft shoulder two of pump shaft
Side；The front axle pressure cap 19 and rear axle pressure cap 20 are fixed on bearing body 17 by third bolt 21, are interted on pump shaft 22
There are impeller 4, mechanical seal 27, pump cover 15, front axle pressure cap 19, rear axle pressure cap 20, front-seat bearing 23,24 and heel row bearing
25,22 right end of pump shaft is connected to the motor by shaft coupling.The import of the suction chamber 2 does not have to installation check valve, suction chamber
The central axes of inlet cross section are higher by 20mm~30mm than volute outlet 14, it is therefore intended that the case where not installing check valve
Under, sufficiently high liquid level can be contained in gas-liquid separation chamber 7 when termination of pumping, can also smoothly be reached self-priming when being again started up the present invention and be wanted
It asks, avoids the loss of check valve, improve the performance of pump.
The diversion pipe 10 selects anti-riot connecting tube, and the big and bent characteristic of intensity facilitates operation, diversion pipe 10
Left end is connected with the drainage hole on the pump housing 1, and the right end of diversion pipe 10 is connected with the pump cover through-hole 28 on pump cover 15, diversion pipe 10 with
Drainage hole, diversion pipe 10 are identical as the mode that pump cover through-hole 28 connects, by taking diversion pipe 10 is connect with drainage hole as an example, connection type
Are as follows: diversion pipe 10 is connected by connector 29 with drainage hole, and connector 29 is double nipples, and 29 right end of connector and the pump housing 1 are with screw thread
M22 × 1.5 cooperates, and 29 inner circle exit of butt joint carries out chamfering, to reduce hydraulic loss；The left end of connector 29 and diversion pipe
10 fastening nut 30 is with the cooperation of screw thread M24 × 1.5, and interface cushioning circle 31 prevents from revealing, fastening nut 30 and connector 29
Diversion pipe 10 and connector 29 can be compressed by tightening, as shown in Figure 3.
Since the entrance and volute outlet 14 of suction chamber 2 ensure that certain difference in height, liquid is flow backwards not when shutting down every time
Sufficiently, the liquid that sufficient amount can be stored in the pump housing 1 is used for starting next time.Before initial start-up, foot need to be injected into the pump housing 1
The liquid enough measured starts motor, is rotated by 22 impeller 4 of pump shaft, and high-speed rotating impeller 4 does work to its internal liquid,
Liquid is exported along impeller 4 by centrifugal force and flows into spiral case 3, and forms the band-like gas-liquid mixture of foam with gas mixing, and gas-liquid is mixed
Object is closed to be pressurized through the deceleration of 3 diffuser of spiral case and be discharged to gas-liquid separation chamber 7.At this point, since space increases suddenly, flow velocity rapid drawdown,
The small gas of relative density escapes outside 13 discharge pump of pump discharge from water, and the biggish liquid of relative density is fallen by gravity
To 7 bottom of gas-liquid separation chamber, flowed back into spiral case 3 through symmetrically arranged first return port 9 and the second return port 8, again with gas
Body mixing.With the circulation of the above process in cycles, more and more gases are discharged, and the vacuum degree in suction chamber 2 constantly increases
Greatly, the suction line continuous edge being connected with suction chamber 2 by conveying liquid rises, and is ultimately inhaled gas in pipe and is emptied, the present invention
Complete self-priming process.
After the present invention completes starting, when normal operation, symmetrically arranged first return port 9 of the present invention and the second return port
8 just embody its advantages.When the present invention runs well, the pressure in gas-liquid separation chamber 7 is higher than the pressure in spiral case 3,
So when still have reflux, since the first return port 9 and the second return port 8 are symmetricly set on the two sides of impeller middle section, and
The flow of first return port 9 and the second return port 8 is essentially identical, so that the fluidal texture in spiral case 3 is to be symmetrical in impeller 4 to cut
Face, mobile phase can be eliminated to stabilization or reduce the secondary flow phenomenon in 3 section of spiral case, therefore can reduce hydraulic loss, reduce
Pressure fluctuation.Symmetrical withdrawing fluid of the invention, impacting axial force of impeller caused by impeller 4 can cancel out each other, with existing skill
The axial force of impeller of art can increase bearing service life compared to substantially reducing, while avoid danger brought by impeller axial float
Evil.
The cross section of first return port 9 and the second return port 8 is that the advantage of ellipse is: contour line is to smoothly transit
Curve, its boundary layer flow even transition when liquid flows through the first return port 9 and the second return port 8, flow stablize waterpower damage
It loses small.Facilitate the determination and adjusting of 8 shape of the first return port 9 and the second return port；First determine the first return port 9 and the second reflux
The cross-sectional area in hole 8, then determine the shape of the first return port 9 and the second return port 8；By taking the first return port 9 as an example: determining
The cross-sectional area A of one return port 9k1, in conjunction with spiral case 3 structure by area formula Ak1=π ab gives the ellipse of the first return port 9
The semi-major axis b and semi-minor axis a of shape cross section, that is, can determine the shape of the first return port 9, and wherein a is about the 40%~60% of b.
The rounding of 0.5~5mm can be carried out, according to the size of its own in the two sides of the first return port 9 and the second return port 8 to subtract
The energy loss of weep.
In order to definitely at large understand beneficial effects of the present invention, respectively to the exterior mixing self-absorption centrifugal of the prior art
Pump and the present invention have carried out numerical simulation, and the following are analog result and analyses:
Fig. 6 a is the section motion pattern of exterior mixing self-priming centrifugal pump in the prior art spiral case at return port；Fig. 6 b is this
The section motion pattern of invention spiral case 3 at the first return port and the second return port.By comparing it can be found that in the prior art
Exterior mixing self-priming centrifugal pump, in the side opposite with return port there are serious secondary flow vortices in spiral case, stream in spiral case section
Dynamic structure is asymmetrical, and this secondary flow structure changes at any time, and pressure is unevenly distributed, and there are biggish pressure ladders
Degree, return port lateral pressure is maximum, and in the position that vortex occurs, there are apparent low-pressure areas.And the present invention plants two in 3 section of spiral case
Secondary stream vortex disappears, and two sides withdrawing fluid uniformly flows into spiral case 3, in centre since two bursts of reflux flow direction of meeting changes,
It is flowed away to 4 export direction of impeller, entire fluidal texture is almost symmetrical with impeller middle section, and pressure distribution is also the same symmetrical, and leaf
Take turns the uniform mistake of pressure among the first return port 9 and the second return port 8 to spiral case 3 of middle section two sides close to 4 exit of impeller
It crosses.
By the comparison of Fig. 6 a and Fig. 6 b, it can be concluded that, the present invention significantly improves exterior mixing self-absorption centrifugal in the prior art
Pump non-uniform flow regime at return port.
Fig. 7 is exterior mixing self-priming centrifugal pump and the present invention pressure fluctuation time domain in spiral case at the return port of the prior art
Figure；Exterior mixing self-priming centrifugal pump and of the invention return port at spiral case in pressure fluctuation frequency domain figure, acquisition of the Fig. 8 for the prior art
Data are two impeller swing circles.Observe Fig. 7 discovery, the exterior mixing self-priming centrifugal pump and spiral case of the invention of the prior art
At return port, pressure fluctuation time domain variation tendency is consistent, and 2 pulsation periods are presented in each swing circle, has wave crest, wave
Each two, paddy, periodically pulsing is fairly obvious, but the pressure fluctuation in the present invention slightly reduces.Fig. 8 discovery is observed, it is existing
The exterior mixing self-priming centrifugal pump of technology and ripple frequency of the invention are all the blade passing frequency (96.67Hz) and its again of impeller
Frequently, primary frequency zone is 1 times of leaf frequency, and secondary dominant frequency is 2 times of leaf frequencies, and the pulsation amplitude of high power leaf frequency is relatively weak.Under each frequency of the present invention
Pulsation amplitude exterior mixing self-priming centrifugal pump compared with the prior art decrease, primary frequency zone is more obvious, compares the prior art
Reduce by 33.8%.
Exterior mixing self-priming centrifugal pump and of the invention axial force in two swing circle inner impeller 4 of the Fig. 9 for the prior art
Schematic diagram.It can be found that the axial force of impeller 4 of the present invention is substantially reduced compared with the prior art, and in 4 swing circle of impeller, leaf
The average value and the maximum value range of decrease for taking turns 4 axial forces are respectively 51.1% and 47.6%.For mammoth pump, effect will be brighter
It is aobvious.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range should not be construed as being limited to the specific forms stated in the embodiments, and protection scope of the present invention also includes art technology
Personnel conceive according to the present invention it is conceivable that equivalent technologies mean.
Claims (6)
1. a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port, it is characterised in that: the centrifugal pump being vertically arranged includes a left side
The pump housing of side and the pump cover on right side, the pump housing are arranged on horizontal pump bracket, and the pump housing is equipped with suction chamber and the draining of water inlet
Pump discharge, the pump housing is interior to be equipped with impeller, spiral case and gas-liquid separation chamber, and impeller is arranged in spiral case；Pump shaft runs through pump cover, pump shaft
Left end extends in spiral case, and impeller is fixed on the left end of pump shaft, and the right end of pump shaft is connected with the output shaft of motor；Suction chamber with
The entrance of impeller is connected, and the outlet of impeller is connected with volute inlet, and the outlet of spiral case is connected with gas-liquid separation chamber, gas-liquid
Separation chamber passes through pump discharge to exterior liquid；
The first return port and the second return port are provided on the spiral case, the first return port and the second return port are located in impeller
The symmetrical two sides in section；Spiral case inner cavity is connected to by the first return port with the right side of gas-liquid separation chamber, and spiral case inner cavity passes sequentially through
Second return port, pump cover through-hole, diversion pipe, drainage hole are connected to the left side of gas-liquid separation chamber, and pump cover through-hole is provided on pump cover,
Drainage hole is provided in gas-liquid separation chamber；The right-end openings of first return port are connected with spiral case inner cavity, the left end of the second return port
Opening is connected with spiral case inner cavity, and the distance between the right-end openings of the first return port and impeller middle section and the second return port
Left end opening is equal with the distance between impeller middle section；The impeller middle section refers to impeller along axial center place
Cross section；The shape of the cross section of first return port and the cross section of the second return port is ellipse；
With the center of circle of the cross section where the right-end openings of the first return port for first center of circle, it is open with the left end of the second return port
The center of circle of the cross section at place is second center of circle, and the line for defining first center of circle and second center of circle is the return port position line, then returns
The midpoint of the discharge orifice position line is located in the plane where impeller middle section, defines the radial direction of the impeller middle section where the midpoint
For position radial direction, then the short axle direction of the first return port cross section and the short axle direction of the second return port cross section are equal
It is radially parallel with the position；
The length of the short axle of first return port cross section is the 40%~60% of long axis length, the cross section of the second return port it is short
The length of axis is the 40%~60% of long axis length；
Area of the area of the cross section of second return port less than the cross section of the first return port.
2. a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port as described in claim 1, it is characterised in that: first time
The cross-sectional area of discharge orificeThe area of the cross section of second return portN is the rated speed of pump, unit r/min in formula；D2For impeller outer diameter, unit
For m；QdFor the flow of pump, unit m3/h；D is the diameter of diversion pipe, unit m；D=1.2dk1, dk1For the first return port
Equivalent diameter；L is the length of diversion pipe, unit m；δ is the axial length of the second return port, unit m；θ is cut water along leaf
Radian of the wheel direction of rotation to return port center；λ is the frictional resistant coefficient of diversion pipe.
3. a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port as claimed in claim 2, it is characterised in that: the suction
Water chamber is S-shaped along the vertical direction, and the entrance of suction chamber is connected to by intake line with external source, the outlet of suction chamber and impeller
Entrance connection, the central axes of suction chamber inlet cross section are higher than the outlet of spiral case.
4. a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port as claimed in claim 3, it is characterised in that: first time
The center of circle of the cross section of discharge orifice, the second return port, pump cover through-hole and drainage hole in the same horizontal line, with ignoring position can shadow
It rings.
5. a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port as claimed in claim 4, it is characterised in that: the pump
The central axes of outlet and the central axes of volute outlet coincide.
6. a kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port as claimed in claim 5, it is characterised in that: cut water with
Angle theta of the return port position line along impeller direction of rotation is 3.3~3.8rad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610858533.2A CN106402031B (en) | 2016-09-27 | 2016-09-27 | A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610858533.2A CN106402031B (en) | 2016-09-27 | 2016-09-27 | A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106402031A CN106402031A (en) | 2017-02-15 |
| CN106402031B true CN106402031B (en) | 2019-02-01 |
Family
ID=58015652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610858533.2A Active CN106402031B (en) | 2016-09-27 | 2016-09-27 | A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106402031B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023490B (en) * | 2017-05-22 | 2020-01-24 | 江苏大学 | Semi-spiral water inlet type double-suction self-sucking pump |
| CN107503948B (en) * | 2017-09-30 | 2024-05-10 | 江苏武新泵业有限公司 | Concentric water inlet type double-spiral volute self-priming pump |
| CN111412184B (en) * | 2020-03-27 | 2021-06-11 | 安徽埃斯克制泵有限公司 | Cavitation-resistant double-suction split pump and working method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3983952B2 (en) * | 1999-07-22 | 2007-09-26 | 日本電産サンキョー株式会社 | Self-priming pump device |
| CN2530072Y (en) * | 2001-08-31 | 2003-01-08 | 黄健 | Centrifugal pump |
| CN202182037U (en) * | 2011-06-23 | 2012-04-04 | 广东顺达船舶工程有限公司 | Self-absorption smashing pump |
| CN102338097A (en) * | 2011-10-08 | 2012-02-01 | 杭州新安江工业泵有限公司 | Centrifugal pump and adjustable manufacture method thereof |
| CN206092512U (en) * | 2016-09-27 | 2017-04-12 | 浙江工业大学 | Outer formula self -priming centrifugal pump that mixes with symmetry backward flow hole |
-
2016
- 2016-09-27 CN CN201610858533.2A patent/CN106402031B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106402031A (en) | 2017-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106402031B (en) | A kind of exterior mixing self-priming centrifugal pump equipped with symmetrical return port | |
| CN106351881B (en) | A kind of exterior mixing self-priming centrifugal pump | |
| CN206175315U (en) | External mixing type self -priming centrifugal pump | |
| CN104895852B (en) | Spiral-flow type jet pump | |
| CN108361205A (en) | A kind of centrifugal pump impeller and the LNG immersed pumps comprising the centrifugal pump impeller | |
| CN206092512U (en) | Outer formula self -priming centrifugal pump that mixes with symmetry backward flow hole | |
| CN104895800A (en) | Multi-stage submersible pump system | |
| CN109157993B (en) | Micro-nano bubble generator and generation method | |
| CN102966601B (en) | A kind of pump semi-spiral suction chamber Hydraulic Design Method | |
| CN107023490A (en) | A kind of half-spiral inlet type double suction self priming pump | |
| CN203532331U (en) | Staggered centrifugal pump space guide vane | |
| CN106870462B (en) | A kind of design method of the elbow inlet passage of pumping plant | |
| CN108843580B (en) | Self-priming centrifugal pump with high volumetric efficiency | |
| CN101737359B (en) | Asymmetric self-circulation processing case with slotting position of sine distribution for centrifugal compressor | |
| CN205243923U (en) | Open double suction centrifugal pump in level | |
| CN205478555U (en) | Centrifugal pump side direction formula spiral delivery chamber | |
| CN203067360U (en) | Space guide vane body provided with suction surface auxiliary vanes | |
| CN207892885U (en) | Enclosed balances impeller | |
| CN110439789A (en) | Single-chamber axial-flow type has valve piezoelectric pump and driving method | |
| CN205744475U (en) | A kind of double-stage self priming pump of band spiral pumping chamber | |
| CN205173062U (en) | Self priming pump foundry goods | |
| CN104791292B (en) | A kind of axial-flow pump impeller water guide cone | |
| CN107970826B (en) | Stirring device | |
| CN203594976U (en) | Spiral-flow type oil-gas separation surge tank for oil-gas multiphase pump | |
| CN108661917B (en) | High-efficiency energy-saving self-priming centrifugal pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |