CN206175315U - External mixing type self -priming centrifugal pump - Google Patents
External mixing type self -priming centrifugal pump Download PDFInfo
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- CN206175315U CN206175315U CN201621086001.3U CN201621086001U CN206175315U CN 206175315 U CN206175315 U CN 206175315U CN 201621086001 U CN201621086001 U CN 201621086001U CN 206175315 U CN206175315 U CN 206175315U
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- return port
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Abstract
The utility model provides an external mixing type self -priming centrifugal pump, first backward flow hole and second backward flow hole are located the both sides of impeller middle section symmetry respectively, the spiral case inner chamber communicates through the right side of first backward flow hole with gas -liquid separation chamber, and the spiral case inner chamber loops through second backward flow hole, pump cover through -hole, honeycomb duct, wash port and gas -liquid separation chamber's left side intercommunication, and the pump cover through -hole is seted up on the pump cover, and the wash port is seted up on gas -liquid separation chamber, the right -hand member opening in first backward flow hole and the left end opening and the distance between the impeller middle section in distance between the impeller middle section and second backward flow hole equal, the shape of the cross section in first backward flow hole and the cross section in second backward flow hole is the ellipse. The line that defines the first centre of a circle and the second centre of a circle is the backward flow hole line of position, and the mid point of the backward flow hole line of position lies in the plane at impeller middle section place, and it is radial that the impeller middle section at definition mid point place radial be the position, and the minor axis place orientation and the second of first backward flow hole cross section flow back the minor axis of hole cross section and belong to the orientation and all radially parallel with the position.
Description
Technical field
This utility model is related to a kind of exterior mixing self-priming centrifugal pump.
Background technology
External-mix self-priming pump belongs to one kind of centrifugal pump, because of its good self-priming performance and job stability, widely should
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 backflow pore structure.When return port can ensure that self-priming pump startup, liquid backflow is introduced into spiral case, gas-liquid is fully mixed
Close, gas-liquid mixed discharge spiral case is entered gas-liquid separation chamber by impeller acting, and gas is discharged along outlet, and the larger liquid of proportion is then
Separation chamber bottom is sunk to, Jing return ports turn again to spiral case, with gas mixing, so circulation is until draining in intake line
Gas, so as to realize self-priming.
But, after self priming pump normal work, the backflow effect of pump housing upper return port has a strong impact on the flowing in spiral case
State, under the backflow of return port and the comprehensive function of impeller-spiral case stator-rotor interaction, the flowing in spiral case is increasingly complex.Jing is returned
The liquid that discharge orifice is back in spiral case destroys the interior symmetrically fluidal texture of spiral case, makes to produce in spiral case cross section with week time
The unilateral spiral structure of phase change, not only causes hydraulic loss increase in spiral case, can also induce serious pressure fluctuation, causes machine
Group vibration and noise.Also, because its impact of one side backflow to impeller, axial force of impeller can be significantly increased, seriously reduce axle
The service life held, while making impeller that axial float to occur, it is more likely that cause impeller port ring to wear and tear.
The content of the invention
To solve above technological deficiency, the utility model proposes a kind of exterior mixing self-priming centrifugal pump pump body structure, makes spiral case
Both sides are symmetrically flowed back, and can improve the flow regime in spiral case, make to produce in spiral case the metastable impeller middle section that is symmetrical in
Fluidal texture, so as to reduce hydraulic loss, reduces pressure fluctuation, and the axial force of impeller for causing that symmetrically flows back can be supported mutually
Disappear, so as to greatly improve the stability and reliability of self priming pump operating.
The technical solution of the utility model is：
A kind of exterior mixing self-priming centrifugal pump, the centrifugal pump being vertically arranged includes the pump housing in left side and the pump cover on right side, the pump housing
It is arranged on horizontal pump support, the pump housing is provided with the pump discharge of the suction chamber into water and draining, impeller, spiral case is provided with the pump housing
And gas-liquid separation chamber, and impeller is arranged in spiral case；Pump shaft runs through pump cover, and the left end of pump shaft is extended in spiral case, and impeller is fixed
On the left end of pump shaft, the right-hand member of pump shaft is connected with the output shaft of motor；Suction chamber is connected with the entrance of impeller, and impeller goes out
Mouthful be connected with volute inlet, the outlet of spiral case is connected with gas-liquid separation chamber, gas-liquid separation chamber pass through pump discharge to exterior liquid,
Aerofluxuss；
The first return port and the second return port are provided with the spiral case, the first return port and the second return port are located at respectively leaf
The symmetrical both sides in wheel middle section；Spiral case inner chamber is connected by the first return port with the right side of gas-liquid separation chamber, and spiral case inner chamber is successively
Connected with the left side of gas-liquid separation chamber by the second return port, pump cover through hole, mozzle, osculum, pump cover through hole is opened in pump
Cover, osculum is opened in gas-liquid separation chamber；The right-end openings of the first return port are connected with spiral case inner chamber, the second return port
Left end opening is connected with spiral case inner chamber, and the distance between the right-end openings of the first return port and impeller middle section and second are flowed back
The left end opening in hole is equal with the distance between impeller middle section；Described impeller middle section refers to impeller center vertically
The cross section that place is located；The shape of the cross section of the cross section of the first return port and the second return port is ellipse.
The center of circle of the cross section being located with the right-end openings of the first return port as first center of circle, with the left end of the second return port
The center of circle of the cross section that opening is located 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 that impeller middle section is located, and defines the impeller middle section that the midpoint is located
Radial direction is position radial direction, then the short axle place side of the short axle place direction of the first return port cross section and the second return port cross section
Position described in Xiang Junyu is radially parallel.
Further, the suction chamber is vertically S-shaped, and the entrance of suction chamber is connected by intake line with external source
Logical, the outlet of suction chamber is connected with the entrance of impeller, and the axis of suction chamber porch cross section is 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 osculum is in same level
On line, to ignore the impact of potential energy.
Further, the axis of the pump discharge coincides with the axis of volute outlet.
Further, angle theta of the cut water with the return port position line along impeller direction of rotation is 3.3~3.8rad.
Further, the length of the short axle of the first return port cross section is the 40%~60% of long axis length, the second return port
The length of short axle of cross section be the 40%~60% of long axis length.
The beneficial effects of the utility model are：
1. this utility model both sides are symmetrically flowed back, and are changed with the asymmetry quantum dot structure of time mechanical periodicity in spiral case,
Symmetrically backflow makes the fluidal texture in spiral case tend to symmetrical for both sides, and flow regime in the improvement spiral case of high degree is especially reduced
Vortex motion structure in spiral case, reduces hydraulic loss.
2. this utility model both sides are symmetrically flowed back, and make the pressure distribution in spiral case more uniform, while improve spiral case breaking
The asymmetric Secondary Flow with time mechanical periodicity in face, it is possible to decrease pressure fluctuation, improves pump operation stability.
3. this utility model both sides are symmetrically flowed back, and impacting the axial force of impeller caused by impeller can cancel out each other, and existing
The axial force of impeller of technology is compared and substantially reduced, and can reduce the impact to bearing and mechanical seal, increases its service life, while
The harm for avoiding impeller axial float from being brought.
The drain by the way of mozzle of 4 this utility model, it is easy to use, it is with low cost, reaching symmetrical backflow purpose
While do not increase the complexity of pump body structure, its casting difficulty will not be increased.
5. this utility model saves import unidirectional by way of suction chamber import and volute outlet ensure certain altitude difference
The installation of valve, had both reduced cost, and the external characteristics of pump can be improved again.
Description of the drawings
Fig. 1 is sectional view of the present utility model.
Fig. 2 is structure enlarged diagram at B in Fig. 1.
Fig. 3 is structure enlarged diagram at C in Fig. 1.
Fig. 4 is the first backflow hole site schematic shapes.
Fig. 5 is isometric side view of the present utility model.
Fig. 6 a for prior art exterior mixing self-priming centrifugal pump at return port spiral case section motion pattern；
Fig. 6 b are the section motion pattern of this utility model spiral case at the first return port and the second return port.
Fig. 7 for prior art exterior mixing self-priming centrifugal pump and this utility model in spiral case at return port during pressure fluctuation
Domain comparison diagram, the longitudinal axis C in figurepFor the characteristic of pressure fluctuation.
Fig. 8 for prior art exterior mixing self-priming centrifugal pump and this utility model in spiral case at return port pressure fluctuation frequency
Domain comparison diagram, the longitudinal axis C in figurepFor the characteristic of pressure fluctuation.
Fig. 9 is the exterior mixing self-priming centrifugal pump and axial force of impeller comparison diagram of the present utility model of prior art.
In figure：The 1- pump housings, 2- suction chambers, 3- spiral cases, 4- impellers, 5- flat keys, 6- the impeller nuts, (storage of 7- gas-liquid separation chamber
Liquid room), the second return ports of 8- two, the return ports of 9- first, 10- mozzles, 11- pump supports, 12- steam vents, 13- pump discharges, 14-
Volute outlet, 15- pump covers, the bolts of 16- first, the bolts of 18- second, the bolts of 21- the 3rd, 19- front axle pressure caps, bearing after 20-
Gland, 22- pump shafts, 23- heel row bearings, 24,25- front row bearing, 26- rubber rings, 27- mechanical seals, 28- pump cover through holes, 29-
Union joint, 30- clamp nuts, 31- packing rings, 32- cut waters.
Specific embodiment
This utility model is further illustrated with reference to the accompanying drawings and examples.
As illustrated, a kind of exterior mixing self-priming centrifugal pump, the centrifugal pump being vertically arranged includes the pump housing 1 in left side and right side
Pump cover 15, the pump housing 1 is arranged on horizontal pump support 11, and the pump housing 1 is provided with the pump discharge 13 of the suction chamber 2 into water and draining,
Impeller 4, spiral case 3 and gas-liquid separation chamber 7 are provided with the pump housing 1, and impeller 4 is arranged in spiral case 3；Pump shaft 22 runs through pump cover 15, pump
The left end of axle 22 is extended in spiral case 3, and impeller 4 is fixed on the left end of pump shaft 22, the right-hand member of pump shaft 22 and the output shaft of motor
It is connected；Suction chamber 2 is connected with the entrance of impeller 4, and the outlet of impeller 4 is connected with the entrance of spiral case 3, the outlet of spiral case 3 and gas
Liquid separation chamber 7 is connected, and gas-liquid separation chamber 7 is by pump discharge 13 to exterior liquid；
The first return port 9 and the second return port 8 are provided with the spiral case 3, the first return port 9 and the second return port 8 are distinguished
Positioned at the symmetrical both sides in impeller middle section；The inner chamber of spiral case 3 is connected by the first return port 9 with the right side of gas-liquid separation chamber 7, spiral case
3 inner chambers pass sequentially through the second return port 8, pump cover through hole 28, mozzle 10, osculum and connect with the left side of gas-liquid separation chamber 7, pump
Lid through hole 28 is opened on pump cover 15, and osculum is opened in gas-liquid separation chamber 7；The right-end openings of the first return port 9 and spiral case 3
Inner chamber is connected, and the left end opening of the second return port 8 is connected with the inner chamber of spiral case 3, and in the right-end openings of the first return port 9 and impeller
The left end opening of the distance between section and the second return port 8 is equal with the distance between impeller middle section；In described impeller
Section refers to the cross section that the center vertically of impeller 3 is located；The cross section of the first return port 9 and the second return port 8
The shape of cross section is ellipse.
The center of circle of the cross section being located with the right-end openings of the first return port 9 as first center of circle, with a left side for the second return port 8
The center of circle of the cross section that end opening is located is second center of circle, defines the line in first center of circle and second center of circle for backflow hole site
Line, then the midpoint of the return port position line be located in the plane that impeller middle section is located, define in the impeller that the midpoint is located and cut
The radial direction in face is position radial direction, then the short axle of the short axle place direction of the cross section of the first return port 9 and the cross section of the second return port 8
Place direction is radially parallel with the position.
The short axle place direction of the cross section of the first return port 9 and the short axle of the cross section of the second return port 8 and position radial direction phase
It is parallel, the stress concentration that the first return port 9 and the perforate of two return port 8 bring to spiral case 3 can be reduced, can also reduce backflow to snail
The impact of main flow in shell 3.
The length of the short axle of the cross section of the first return port 9 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-axis direction is controlled with this, if the first return port 9
It is oversized along its cross section short-axis direction with the second return port 8, spiral case at the first return port 9 and the second return port 8 can be made
Large area is affected in cross section, increases hydraulic loss.
Angle theta of the cut water with the return port position line along impeller direction of rotation is 3.3~3.8rad, and return port center is in this model
The self-priming performance of pump is best when enclosing interior.
The suction chamber 2 is vertically S-shaped, and the entrance of suction chamber 2 is connected by intake line with external source, inhales
The outlet of hydroecium 2 is connected with the entrance of impeller 4, and the axis of the porch cross section of suction chamber 2 is higher than the outlet of spiral case 14.
The center of circle of the cross section of the first return port 9, the second return port 8, pump cover through hole 28 and osculum is in same horizontal line
On, to ignore the impact of potential energy.
The axis that the axis of the pump discharge 13 exports with spiral case 14 coincides, to ensure the smooth efflux pump of liquid
Outward, hydraulic loss is reduced.
This utility model both sides are symmetrical arranged the first return port and the second return port, change in spiral case 3 with the time cycle
The asymmetry quantum dot structure of change, symmetrically backflow makes the fluidal texture in spiral case tend to symmetrical for both sides, the improvement snail of high degree
Flow regime in shell, reduce inter alia the vortex motion structure in spiral case, reduce hydraulic loss.Especially when both sides are symmetrically flowed back
When measuring equal, symmetrical reflowing result becomes apparent from.
But it is to ensure the first return port 9 and second because mozzle 10 has certain energy loss in drainage process
The capacity of returns of return port 8 is identical, and the area outline of the cross section of the second return port is less than the area of the cross section of the first return port,
And as the cross-sectional area A of the first return port 9k1With the area A of the cross section of the second return portk2When meeting following formula respectively：
Can guarantee that the first return port 9 is identical with the capacity of returns of the second return port 8, n is specified turn of self priming pump in formula
Speed, unit is r/min；D2For impeller outer diameter, unit is m；QdFor the flow of self priming pump, unit is m3/h；D is straight for mozzle
Footpath, unit is m；d≈1.2dk1, dk1For the equivalent diameter of the first return port 9；L is the length of mozzle 10, and unit is m；δ is
The axial length of the second return port 8, unit is m；θ be cut water along impeller direction of rotation to return port center radian, value model
Enclose 3.3~3.8rad；λ is mozzle frictional resistant coefficient.
Because there is energy loss, the cross-sectional area A of the second return port 8 in mozzle 10 in currentk2Can not be direct
Equal to the cross-sectional area A of the first return port 9k1, if it is desired to obtain Ak2, first have to calculate energy loss caused by mozzle 10, with logical
Cross preservation of energy and mass conservation law asks for Ak2And Ak1.Hydraulic pressure of the definition at the first return port 9 and the second return port 8
For lateral pressure, liquid mean flow rate of the definition at the first return port 9 or the second return port 8 is side speed, then gas-liquid separation
The inside pressure of room 7 is P1, the inner side speed of liquid separation chamber 7 is v1；Spiral case inside pressure is Pv, spiral case inner side speed is vv；First time
Liquid mean flow rate in discharge orifice 9 is vk1.It is as follows to the both sides row Bernoulli equation of the first return port 9 first：
Wherein, ξ1The resistance coefficient of the first return port 9, ρ for liquid density, g=9.8N/kg.
According to the cross-sectional area A of the first return portk1And its shape determines the diameter d of mozzle 10, takes d=1.2dk1, dk1For
The equivalent diameter of the first return port 9, water conservancy diversion length of tube L determines according to the size of the pump housing.If liquid mean flow rate in mozzle 10
For v, liquid mean flow rate is v in the second return portk2, equivalent diameter d of the second return portk2.To the import of mozzle 10 and second
(one end that definition mozzle is connected with pump cover through hole is mozzle import to the outlet row Bernoulli equation of return port 8, is defined second time
One end that discharge orifice is connected with pump cover through hole is the second backflow hole exits)：
Wherein, ξ2For draft tube outlets and the resistance coefficient of the junction of pump cover through hole 28；ξ3Hinder for the outlet of the second return port 8
Force coefficient；λ is mozzle frictional resistant coefficient；Due to now dk2It is unknown, solve equation (2) considerably complicated, it is contemplated that dk2With d chis
It is very little close, therefore approx take dk2=d.
If the capacity of returns 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 the flow velocity v of the first return port 9k1, liquid viscosity coefficient calculates Reynolds in the diameter d of mozzle 10 and mozzle 10
Number, consulting Moody chart further according to Reynolds number size can obtain frictional resistant coefficient λ in mozzle 10, in inquiry fluid handbook
Coefficient of partial resistance table is obtained:ξ1=0.06, ξ2=0.07, ξ3=1, formula (1) (2) is substituted into after formula (3), and according to pressure
Power from cut water to return port at linear increase rule, then by ξ1=0.06, ξ2=0.07, ξ3=1 brings into and solves：
Prior art is (referring to document：Instrument group. the budget of external-mix self-priming pump backflow hole area and the determination of parameter.《Irrigation and drainage
Mechanical engineering journal》, the 1992, the 1st phase, page 1~5) disclosed in return port computing formula be：
Ak=(0.95~2.54) is (n/Q)2/3 (4)
But formula (4) is only applicable to the situation of the single return port of calculating and setting, and 0.95~2.54 span phase
Difference is also larger, and does not consider the impact of geometric parameter D2.This utility model is provided with 8 liang of the first return port 9 and the second return port
Individual return port, formula (4) is not simultaneously applied to.
Accordingly, it would be desirable to be modified to the formula on the basis of formula (4), correlation coefficient is adjusted, drawing 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 phases
Close, calculate through dimensional analysis and parameters weighing factor and understand, Ak1Mainly with parameter D2、QdIt is related to n, through dimension
Analysis and parameters weighing factor are calculated, Ak1With n-0.62、 It is directly proportional, it is transversal when the first return port 9
AreaWhen, the first return port 9 ensure utility model works when flow and
Under the premise of efficiency, moreover it is possible to meet self-priming performance and suction lift.
Operationally, the effect of mozzle 10 is to give the drain of the second return port 8 to this utility model, improves flowing shape in spiral case
State；When draining or dismounting maintenance are needed after termination of pumping, the connection of mozzle 10 and pump cover 15 is unloaded, you can discharge opeing.
Pump cover 15 not only serves the sealing function of traditional pump cover, and the pump cover through hole 28 for arranging thereon can UNICOM's mozzle
With the second return port 8.First boss is reserved for pump cover through hole 28 when making, at the same pump housing 1 and the cooperation of pump cover 15
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 coordinates with pump cover 15 can not be excessive, to give
The headspace surplus of pump cover through hole 28.
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 the phase of the second bolt 18
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 provided with the bearing body 17
Row's bearing 24,25 and heel row bearing 23, the front-seat bearing 24,25 and heel row bearing 23 are separately fixed at the shaft shoulder two of pump shaft 22
Side；The front axle pressure cap 19 and rear bearing gland 20 are fixed on bearing body 17 by the 3rd bolt 21, are interted on pump shaft 22
There are impeller 4, mechanical seal 27, pump cover 15, front axle pressure cap 19, rear bearing gland 20, front-seat bearing 23,24 and heel row bearing
25, the right-hand member of the pump shaft 22 is connected by shaft coupling with motor.The import of the suction chamber 2 is without installing check valve, suction chamber
The axis of porch cross section is higher by 20mm~30mm than volute outlet 14, it is therefore intended that in the situation for not installing check valve
Under, sufficiently high liquid level can be contained in gas-liquid separation chamber 7 during termination of pumping, also can smoothly reach when being again started up this utility model certainly
Inhale and require, it is to avoid the loss of check valve, improve the performance of pump.
The mozzle 10 selects anti-riot connecting tube, and the big and bent characteristic of its intensity is convenient to be operated, mozzle 10
Left end is connected with the osculum on the pump housing 1, and the right-hand member of mozzle 10 is connected with the pump cover through hole 28 on pump cover 15, mozzle 10 with
The mode that osculum, mozzle 10 connect with pump cover through hole 28 is identical, so that mozzle 10 is connected with osculum as an example, connected mode
For：Mozzle 10 is connected by joint 29 with osculum, and joint 29 is double nipples, and the right-hand member of joint 29 is with the pump housing 1 with screw thread
M22 × 1.5 coordinate, and the inner circle exit of butt joint 29 carries out chamfering, to reduce hydraulic loss；The left end and mozzle of joint 29
10 clamp nut 30 is with the cooperation of screw thread M24 × 1.5, and seam adds packing ring 31 to prevent leakage, clamp nut 30 and joint 29
Mozzle 10 is compressed with joint 29 by tightening, as shown in Figure 3.
Because the entrance of suction chamber 2 ensure that certain difference in height with volute outlet 14, liquid flows backwards not when shutting down every time
Fully, the liquid of q.s can be stored in the pump housing 1, is used for startup next time.Before initial start-up, foot need to be injected into the pump housing 1
Enough the liquid of amount, starts motor, is rotated by the impeller 4 of pump shaft 22, and at a high speed the impeller 4 of rotation does work to its internal liquid,
Liquid is flowed into spiral case 3 by centrifugal force along the outlet of impeller 4, and forms foam banding gas-liquid mixture with gas mixing, and gas-liquid is mixed
The diffuser of compound Jing spiral cases 3 slows down and is pressurized and is discharged to gas-liquid separation chamber 7.Now, because space increases suddenly, flow velocity rapid drawdown,
The little gas of relative density is escaped outside the excavationg pump of pump discharge 13 from water, and the larger liquid of relative density is fallen by action of gravity
To the bottom of gas-liquid separation chamber 7, the symmetrically arranged return ports 8 of first return port 9 and second of Jing are back in spiral case 3, again with gas
Body mixes.The circulation gone round and begun again with said process, increasing gas is discharged, and the vacuum in suction chamber 2 constantly increases
Greatly, the suction tube continuous edge being connected with suction chamber 2 by conveying liquid rises, and is ultimately inhaled the interior gas of pipe by emptying, this practicality
It is new to complete self-priming process.
After this utility model completes to start, during normal operation, symmetrically arranged first return port 9 of this utility model and the
Two return ports 8 just embody its advantage.When this utility model runs well, the pressure in gas-liquid separation chamber 7 is higher than snail
Pressure in shell 3, so when yet suffer from backflow, due to the first return port 9 and the second return port 8 be symmetricly set in impeller cut
The both sides in face, especially when the first return port 9 is identical with the flow of the second return port 8 so that the fluidal texture in spiral case 3 is
The middle section of impeller 4 is symmetrical in, mobile phase can eliminate or reduce the secondary flow phenomenon in the section of spiral case 3 to stable, therefore can subtract
Small hydro loss, reduction pressure fluctuation.Symmetrical withdrawing fluid of the present utility model, impacts the axial force of impeller caused by impeller 4
Can cancel out each other, substantially reduce compared with the axial force of impeller of prior art, bearing service life can be increased, while avoiding impeller
The harm that axial float is brought.
The cross section of the first return port 9 and the second return port 8 is the advantage of ellipse：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, the stable waterpower of flowing damages
Lose little.Facilitate the determination and regulation of the first return port 9 and the shape of the second return port 8；First determine the first return port 9 and the second backflow
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：It is determined that horizontal
Sectional area Ak1, with reference to spiral case 3 structure by area formula Ak1Half length of the oval cross section of given first return ports 9 of=π ab
Axle b and semi-minor axis a, you can determine the shape of the first return port 9, wherein a is about the 40%~60% of b.Can be in the first return port 9
With the rounding that the both sides of the second return port 8 carry out 0.5~5mm according to the size of its own, damaged with the energy for reducing current
Lose.
In order to definitely at large understand the beneficial effects of the utility model, respectively to the exterior mixing self-priming of prior art
Centrifugal pump and this utility model have carried out numerical simulation, are below analog result and analysis：
Fig. 6 a are the section motion pattern of exterior mixing self-priming centrifugal pump of the prior art spiral case at return port；Fig. 6 b are this
The section motion pattern of utility model spiral case 3 at the first return port and the second return port.Utility model by contrast it is found that
There are serious secondary flow vortices in the side relative with return port in exterior mixing self-priming centrifugal pump of the prior art, spiral case,
Fluidal texture is asymmetrical in spiral case section, and this secondary flow structure changes with the time, and pressure distribution is uneven, exists
Larger barometric gradient, return port lateral pressure is maximum, and the position occurred in vortex has obvious low-pressure area.And this utility model
Plant secondary flow vortices in the section of spiral case 3 to disappear, both sides withdrawing fluid is uniformly flowed in spiral case 3, in centre due to two bursts of backflow phases
Meet flow direction to change, to the Way out diffluence of impeller 4, whole fluidal texture is almost symmetrical in impeller middle section, pressure distribution
It is similarly symmetrical, and first return port 9 and the second return port 8 of impeller middle section both sides close impeller 4 in the middle of spiral case 3 exports
The pressure even transition at place.
Can be drawn by the comparison of Fig. 6 a and Fig. 6 b, this utility model significantly improves exterior mixing self-priming of the prior art
The uneven flow regime at return port of centrifugal pump.
Fig. 7 for prior art exterior mixing self-priming centrifugal pump and this utility model in spiral case at return port during pressure fluctuation
Domain figure；Fig. 8 is the exterior mixing self-priming centrifugal pump and this utility model pressure fluctuation frequency domain in spiral case at return port of prior art
Figure, gathered data is two impeller swing circles.Observation Fig. 7 discoveries, the exterior mixing self-priming centrifugal pump and this reality of prior art
At new spiral case return port, pressure fluctuation time domain variation tendency is consistent, and 2 pulsation weeks are presented in each swing circle
Phase, each two with crest, trough, periodically pulsing is fairly obvious, but the pressure fluctuation in this utility model is slightly dropped
It is low.Observation Fig. 8 has found that the exterior mixing self-priming centrifugal pump and ripple frequency of the present utility model of prior art are all the blade of impeller
By frequency (96.67Hz) and its frequency multiplication, primary frequency zone is 1 times of leaf frequency, and secondary dominant frequency is 2 times of leaves frequencies, the pulsation amplitude of high power leaf frequency
It is relatively weak.The exterior mixing self-priming centrifugal pump of the pulsation amplitude hinge structure under each frequency of this utility model has dropped
Low, primary frequency zone is more obvious, and than prior art 33.8% is reduced.
Fig. 9 is the axle of the exterior mixing self-priming centrifugal pump and this utility model impeller 4 in two swing circles of prior art
To power schematic diagram.It can be found that the axial force of this utility model impeller 4 is substantially reduced compared with prior art, rotate in an impeller 4
In cycle, the meansigma methodss and the maximum range of decrease of the axial force of impeller 4 are respectively 51.1% and 47.6%.For mammoth pump, effect
Fruit will be apparent from.
Content described in this specification embodiment is only enumerating for the way of realization to utility model design, and this practicality is new
The protection domain of type is not construed as being only limitted to the concrete form that embodiment is stated, protection domain of the present utility model is also wrapped
Include those skilled in the art according to this utility model design it is conceivable that equivalent technologies mean.
Claims (4)
1. a kind of exterior mixing self-priming centrifugal pump, it is characterised in that：The pump housing of the centrifugal pump being vertically arranged including left side and right side
Pump cover, the pump housing is arranged on horizontal pump support, and the pump housing is provided with the pump discharge of the suction chamber into water and draining, is provided with the pump housing
Impeller, spiral case and gas-liquid separation chamber, and impeller is arranged in spiral case；Pump shaft runs through pump cover, and the left end of pump shaft is extended in spiral case,
Impeller is fixed on the left end of pump shaft, and the right-hand member of pump shaft is connected with the output shaft of motor；Suction chamber 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, and gas-liquid separation chamber passes through pump discharge
To exterior liquid, aerofluxuss；
The first return port and the second return port are provided with the spiral case, the first return port and the second return port are located at respectively in impeller
The symmetrical both sides in section；Spiral case inner chamber is connected by the first return port with the right side of gas-liquid separation chamber, and spiral case inner chamber is passed sequentially through
Second return port, pump cover through hole, mozzle, osculum are connected with the left side of gas-liquid separation chamber, and pump cover through hole is opened on pump cover,
Osculum is opened in gas-liquid separation chamber；The right-end openings of the first return port are connected with spiral case inner chamber, the left end of the second return port
Opening is connected with spiral case inner chamber, 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；Described impeller middle section refers to impeller center place vertically
Cross section；The shape of the cross section of the cross section of the first return port and the second return port is ellipse；
The center of circle of the cross section being located with the right-end openings of the first return port as first center of circle, with the left end opening 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 return
The midpoint of the discharge orifice position line is located in the plane that impeller middle section is located, and defines the radial direction of the impeller middle section that the midpoint is located
For position radially, then the short axle place direction of the short axle place direction of the first return port cross section and the second return port cross section is equal
It is radially parallel with the position.
2. a kind of exterior mixing self-priming centrifugal pump as claimed in claim 1, it is characterised in that：The suction chamber is in vertically
S-shaped, the entrance of suction chamber is connected by intake line with external source, and the outlet of suction chamber is connected with the entrance of impeller, water suction
Outlet of the axis of cross section higher than spiral case at chamber inlet.
3. a kind of exterior mixing self-priming centrifugal pump as claimed in claim 2, it is characterised in that：First return port, the second return port,
The center of circle of the cross section of pump cover through hole and osculum is in the same horizontal line.
4. a kind of exterior mixing self-priming centrifugal pump as claimed in claim 3, it is characterised in that：The axis of the pump discharge and snail
The axis of shell outlet coincides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621086001.3U CN206175315U (en) | 2016-09-27 | 2016-09-27 | External mixing type self -priming centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621086001.3U CN206175315U (en) | 2016-09-27 | 2016-09-27 | External mixing type self -priming centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206175315U true CN206175315U (en) | 2017-05-17 |
Family
ID=58676978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621086001.3U Withdrawn - After Issue CN206175315U (en) | 2016-09-27 | 2016-09-27 | External mixing type self -priming centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206175315U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351881A (en) * | 2016-09-27 | 2017-01-25 | 浙江工业大学 | External mixing type self-priming centrifugal pump |
| CN108087291A (en) * | 2017-12-29 | 2018-05-29 | 浙江工业大学 | Cavity configuration centrifugal pump after a kind of high-lift linear leaf molded line |
| CN114278579A (en) * | 2021-12-20 | 2022-04-05 | 中山市船振游艇有限公司 | Novel water pump |
-
2016
- 2016-09-27 CN CN201621086001.3U patent/CN206175315U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351881A (en) * | 2016-09-27 | 2017-01-25 | 浙江工业大学 | External mixing type self-priming centrifugal pump |
| CN108087291A (en) * | 2017-12-29 | 2018-05-29 | 浙江工业大学 | Cavity configuration centrifugal pump after a kind of high-lift linear leaf molded line |
| CN108087291B (en) * | 2017-12-29 | 2024-03-26 | 浙江工业大学 | High-lift long-blade molded line rear cavity structure centrifugal pump |
| CN114278579A (en) * | 2021-12-20 | 2022-04-05 | 中山市船振游艇有限公司 | Novel water pump |
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Granted publication date: 20170517 Effective date of abandoning: 20190201 |
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| AV01 | Patent right actively abandoned |
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| AV01 | Patent right actively abandoned |