CN209398624U - Vertical centrifugal pump axial force balance structure - Google Patents
Vertical centrifugal pump axial force balance structure Download PDFInfo
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- CN209398624U CN209398624U CN201920153886.1U CN201920153886U CN209398624U CN 209398624 U CN209398624 U CN 209398624U CN 201920153886 U CN201920153886 U CN 201920153886U CN 209398624 U CN209398624 U CN 209398624U
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- pump
- impeller
- water inlet
- pressure chamber
- pump case
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Abstract
The utility model relates to a kind of vertical centrifugal pump axial force balance structures, including pump case and vertical pump shaft, the upper end of pump shaft connects motor, lower end is protruded into pump case and is connect with the impeller in pump case and rotated with impeller, the water inlet end of impeller is downward, protrusion is equipped with a circle vane rings on the back shroud of impeller, and sealing opening ring is equipped between the outside and pump case of vane rings；It is formed with pressure chamber between the pump case of the back shroud in vane rings to top, several perforative balance holes are offered on the back shroud of pressure chamber bottom, offer perforative relief hole on the pump case at the top of pressure chamber；The external adjusting pipeline of relief hole, regulation pipe road are equipped with pressure gauge and regulating valve.The utility model is by opening up relief hole and external adjusting pipeline, during sealing opening ring and impeller czermak space become larger, it can correspond to and adjust the indoor fluid media (medium) amount of releasing of pressure chamber, achieve the effect that balancing axial thrust, in the continuous use time limit for extending pump, reduce the depot repair frequency of pump.
Description
Technical field
The utility model belongs to the technical field of non-varactor pump in fluid varactor machine, and in particular to it is a kind of it is vertical from
Heart pump axial force balance structure.
Background technique
Centrifugal pump is the pump for carrying out trandfer fluid by the centrifugal force generated when impeller rotation, and fluid is inhaled into from water inlet, from
Water outlet is pumped out.In vertical centrifugal pump operation process, impeller would generally pass to pump shaft power axially downwards, excessive axial force
It will cause pump shaft upper bearing (metal) overload, temperature increases, and pump is unable to operate normally.It, can be with similar to impeller pair at pump design initial stage
Claim or the methods of balancing frame reduces axial force, wherein single-stage impeller can be put down by way of opening balance hole on impeller
Weigh axial force, and balance hole is provided on the back shroud of impeller by impeller and balanced hole structure as shown in CN205806003U,
In use, the high-pressure fluid in the pumping chamber on impeller outer edge flows into the pressure in vane rings by the seal clearance on the outside of vane rings
Cavity, pressure cavity pass through the balance hole opened up and are connected to the relatively low pressure area of impeller water inlet end, and the intracorporal fluid of pressure chamber is logical
The balance hole crossed on impeller flows into the low-pressure area of impeller water inlet end, and the intracorporal pressure reduction of pressure chamber is made to act on leaf to reduce
The pressure for taking turns back shroud, reduces downward axial force, has the function that balancing axial thrust；For balancing axial thrust, also just like
Balance hole shown in CN203384086U opens up form, and balance hole is provided with above pressure cavity；It is various flat in the prior art
The well format that weighs all is just to have processed balance hole when leaving the factory although can play the role of balancing axial thrust, balance hole
Aperture fixed and processed under the premise of guaranteeing that pump performance meets applying working condition, can preferably be played using initial stage
The effect of balancing axial thrust, but since the aperture of balance hole can not be adjusted again, it pumps after a period of use, due to sealing opening ring
Always with impeller sliding friction, gap wear becomes larger, and the leakage rate of pumping chamber feed pressure cavity is caused to become larger, and axial force increases
Add, be unsatisfactory for after applying working condition pump cannot normal use again, and the gap at sealing opening ring can not be corresponded in use site
The aperture for becoming larger and corresponding to adjustment balance hole, can only return factory and adjust or replace sealing opening ring, the Maintenance and Repair period of pump is short, unfavorable
Cause pump that cannot not there is no early warning, Zhi Nengzhi during normal use again in production line continuous service, and in axial force increase
It is just found after being unable to normal use to pump and is forced to stop using.
Summary of the invention
For the above-mentioned deficiency of the prior art, the technical problem to be solved by the present invention is to provide a kind of vertical centrifugal pumps
Axial force balance structure avoids the problem that adjustment axial force cannot be corresponded in the case where seal clearance becomes larger, and acquirement is prolonged
The effect in the continuous use time limit of long pump.
In order to solve the above technical problems, the utility model adopts the following technical solution:
Vertical centrifugal pump axial force balance structure, including pump case and vertical pump shaft, the upper end connection of the pump shaft is electronic
Machine, the lower end of the pump shaft are protruded into the pump case and are connect with the impeller in pump case and rotated with impeller, the impeller
Downward, protrusion is equipped with a circle vane rings to water inlet end on the back shroud of impeller, and seal is equipped between the outside and pump case of vane rings
Ring；It is formed with pressure chamber between the pump case of the back shroud in vane rings to top, is opened on the back shroud of pressure chamber bottom
Equipped with several perforative balance holes, perforative relief hole is offered on the pump case at the top of pressure chamber；The external tune of relief hole
Pipeline is saved, the regulation pipe road is equipped with pressure gauge and regulating valve.
The utility model can calculate the range that balance hole allows to leak at design initial stage, and it is relatively large to process an aperture
Relief hole, and external adjusting pipeline, pressure chamber is shown by pressure gauge to press and letting out by regulating valve control fluid media (medium)
Output aids in balance hole, is reduced by dischargeing a part of pressure in the case where guaranteeing that pump performance meets applying working condition
Axial force achievees the effect that auxiliary balance axial direction power；In use, between sealing opening ring and vane rings outer fix
Gap becomes larger, and the leakage rate of pumping chamber feed pressure chamber becomes larger, and axial force increases, and can correspond to increase fluid by regulating valve at this time
Medium is adjusted the amount of releasing of pipeline, corresponding adjustment axial force, and can be monitored by pressure gauge remains at pressure
In the range of design, facilitate adjusting.In this way, passing through the method for fine tuning balancing axial thrust, it is possible to reduce the depot repair number of pump,
Axial force can be balanced by artificial simple operations (not needing to tear pump open) at the scene, extends the continuous use time limit of pump, is protected
Demonstrate,prove production line continuous service；After adjustable amount reaches the maximum amount of releasing, by monitoring pressure gauge, the pump that can give warning in advance stops
With, avoid burning out the bearing on pump shaft, until axial force (pressure gauge display pressure) be more than operating condition allow range, pump is returned
Factory's maintenance.
Above-mentioned technical proposal is further improved, the pump case has water inlet flow channel；The adjusting pipeline is connected to pump case
At the outer wall of water inlet flow channel, and the pressure chamber is connected to water inlet flow channel.
In this way, globality is more preferable, fluid media (medium) is avoided to leak；Fluid pressure in water inlet flow channel is relatively low, is low pressure
Area, also meets the design requirement from pressure chamber's aerial drainage, does not influence pressure release effect.
Further, the pump case includes the pump housing and pump cover, and the pump cover is detachably connected with the pump housing, the water inlet flow channel
It is provided in the pump housing, the impeller is located in the pump housing；The pump cover is located above impeller, and the lower end of the pump shaft connects across pump cover
The intracorporal impeller of pump is connect, the sealing opening ring is located at the lower surface of pump cover, and the pressure chamber is formed in the rear cover in vane rings
To between the pump cover of top, the relief hole is provided on pump cover plate.
In this way, simplify the processing of pump case, it is convenient for assembly；The upper end opening of the pump housing is processable greatlyyer, makes impeller can be with
It is packed into the pump housing from top to bottom, then buckles pump cover (pump cover is threaded through on pump shaft in advance), and seal form usually used at present
It is that sealing opening ring is located on pump housing corresponding position, the outer of impeller is relatively large in diameter, and can only be packed into from bottom to top, pump housing lower ending opening
It is larger, the intensity of the pump housing is influenced, process and assemble is also not easy to.
Further, there is water inlet, the water inlet is provided with the side of the pump housing so that below impeller on the pump housing
Pump housing position can close setting, the water inlet is connected to the water inlet end of impeller by water inlet flow channel.
In this way, the load mode in conjunction with impeller changes, the variation of position is opened up by water inlet, is further ensured that the pump housing
Intensity.
Compared with prior art, the utility model has the following beneficial effects:
1, the utility model is by opening up relief hole and external adjusting pipeline, regulation pipe road setting pressure gauge and adjusting
It is indoor can to correspond to adjusting pressure chamber during the gap of sealing opening ring and vane rings outer fix becomes larger for valve
The fluid media (medium) amount of releasing, releases stress, and achievees the effect that balancing axial thrust, extends the continuous use time limit of pump, reduces returning for pump
The frequency is repaired by factory.
2, the utility model passes through the setting of regulation pipe road pressure gauge, can monitor so that pressure remains at design
In range, facilitate the quantitative adjusting of regulating valve；After adjustable amount reaches the maximum amount of releasing, by monitoring pressure gauge, it can shift to an earlier date
Deactivating for early warning pump, avoids burning out the bearing on pump shaft.
3, the utility model globality is more preferable, can avoid fluid media (medium) leakage；The intensity of the pump housing is more preferable, is conveniently cast as
Type；The assembly of whole pump is simple and convenient.
Detailed description of the invention
The structural schematic diagram of Fig. 1-specific embodiment vertical centrifugal pump axial force balance structure；
Wherein, pump case 1, the pump housing 11, water inlet 12, water inlet flow channel 13, pumping chamber 14, outlet passage 15, pressure chamber 16,
Pump cover 17, relief hole 18, pump shaft 2, impeller 3, water inlet end 31, back shroud 32, vane rings 33, balance hole 34, sealing opening ring 4 are adjusted
Save pipeline 5, pressure gauge 51, regulating valve 52, electric machine support 6.
Specific embodiment
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.
Referring to Fig. 1, the vertical centrifugal pump axial force balance structure of specific embodiment, including pump case 1 and vertical pump shaft 2,
The pump case 1 includes the pump housing 11 and pump cover 17, and the pump housing 11 has water inlet 12, water inlet flow channel 13, pumping chamber 14, outlet passage
15,14 position of pumping chamber is corresponding in the pump housing 11 is equipped with impeller 3, and pump cover 17 is fastened on the pump housing 11 and is detachably connected by bolt
And to be tightly connected, pump cover 17 is located at the top of impeller 3；The upper end of the pump shaft 2 connects motor (not shown), pump shaft
2 lower end passes through pump cover 17 and is connect with the impeller 3 in the pump housing 11 with the rotation of impeller 3, can lead between pump shaft 2 and pump cover 17
Cross axle sleeve, bushing is rotatably connected and for be tightly connected, this part is the prior art, and details are not described herein again；The impeller 3 into
Downward, protrusion is equipped with a circle vane rings 33 to water end (W.E.) 31 on the back shroud 32 of impeller 3, and the lower surface protrusion of pump cover 17 is equipped with cricoid
Sealing opening ring 4, the sealing opening ring 4 pass through along several lower surfaces for being vertically bolted to pump cover 17 of one Zhou Junbu, institute
It states sealing opening ring 4 and is disposed around the outside of vane rings 33 for controlling the flow of seal clearance and balanced fluid medium；Vane rings 33
Interior back shroud 32 to the space between the pump cover 17 of top is formed as pressure chamber 16, the back shroud 32 of 16 bottom of pressure chamber
Upper circumferential direction uniformly offers several perforative balance holes 34, offers perforative relief hole on the pump cover 17 at 16 top of pressure chamber
18；The external adjusting pipeline 5 of the relief hole 18, the adjusting pipeline 5 are equipped with pressure gauge 51 and regulating valve 52, specially first connect
It connects pressure gauge 51 and reconnects regulating valve 52, so that the pressure of pressure chamber 16 can also be monitored in the case where regulating valve 52 is closed
Power.
The vertical centrifugal pump axial force balance structure of specific embodiment, can calculate balance hole 34 at design initial stage allows to let out
The range of leakage processes the relatively large relief hole 18 in an aperture, and the area that relief hole 18 may be selected, which is equal to balance hole, to be allowed to let out
The maximum value of leakage subtracts the area of machined balance hole 34 on impeller 3；And external adjusting pipeline 5, pressure chamber 16 passes through pressure
Table 51 is guaranteeing the case where pump performance meets applying working condition to show pressure and by the amount of releasing of the control fluid media (medium) of regulating valve 52
Under, balance hole 34 is aided in, reduces axial force by dischargeing a part of pressure, achievees the effect that auxiliary balance axial direction power,
May be selected first record factory when pressure chamber 16 pressure, usually pump work when by read pressure gauge 51 and dispatch from the factory pressure difference
Value, determines when difference is more than a certain range (or pump bearing is when the temperature is excessively high), and 52 aperture of regulating valve is opened some carry out drains,
The reading of pressure gauge 51 is equal to the pressure of pressure chamber 16；In use, with sealing opening ring 4 and 33 outside position of vane rings
The gap set becomes larger, and the leakage rate of 14 feed pressure chamber 16 of pumping chamber becomes larger, and axial force increases, and can correspond to pass through adjusting at this time
Valve 52 increases fluid media (medium) and is adjusted the amount of releasing of pipeline 5, corresponding adjustment axial force, and can be made by the monitoring of pressure gauge 51
Pressure remains in the range of design, facilitates adjusting.Method by finely tuning balancing axial thrust, it is possible to reduce pump returns factory
Maintenance frequency can balance axial force by artificial simple operations (not needing to tear pump open) at the scene, extend continuously making for pump
With the time limit, guarantee production line continuous service；After adjustable amount reaches the maximum amount of releasing, by monitoring pressure gauge 51, it can shift to an earlier date
Deactivating for early warning pump, avoids burning out the bearing on pump shaft 2.It is fastened using pump cover 17 with the pump housing 11 and installs and set sealing opening ring 4
Form in 17 lower surface of pump cover, can pump case 1 processing, it is convenient for assembly；The upper end opening of the pump housing 11 is processable greatlyyer, makes
Impeller 3 can be packed into the pump housing 11 from top to bottom, and seal form usually used at present is that sealing opening ring 4 is located at the correspondence of the pump housing 11
On position, and the outer of impeller 3 is relatively large in diameter, and can only be packed into from bottom to top, and 11 lower ending opening of the pump housing is larger, influences the pump housing 11
Intensity is also not easy to process and assemble.
Wherein, the adjusting pipeline 5 is connected at the outer wall of water inlet flow channel 13 of the pump housing 11, and by the pressure chamber 16
It is connected to water inlet flow channel 13.In this way, globality is more preferable, fluid media (medium) is avoided to leak；Fluid pressure in water inlet flow channel 13 is opposite
It is lower, it is low-pressure area, also meets the design requirement from 16 aerial drainage of pressure chamber, do not influence pressure release effect.The water inlet 12 is opened
The side of the pump housing 11 is located at so that 11 position of the pump housing of 3 lower section of impeller can close setting, the water inlet 12 passes through water inlet flow channel
13 are connected to the water inlet end 31 of impeller 3.In this way, the load mode in conjunction with impeller 3 changes, the change of position is opened up by water inlet 12
Change, is further ensured that the intensity of the pump housing 11.
When implementation, in order to support and be stably connected with motor, electric machine support 6, electricity usually are connected in the upper surface of pump cover 17
Machine support 6 is circular cylindrical, and coaxial with pump shaft 2 and cover outside pump shaft 2, motor is connected to 6 upper end of electric machine support, in order to guarantee
The stability that pump shaft 2 rotates is arranged bearing usually between the inner wall of electric machine support 6 and pump shaft 2 and connects, and position and quantity can
To be the several groups along the setting of 2 axially spaced-apart of pump shaft.When necessary, i.e., when relief hole 18 is located in electric machine support 6, specific implementation
The adjusting pipeline 5 of example also passes through the side wall of electric machine support 6, and by adjusting the setting of pipeline 5, also there is no the fluids of pressure release to be situated between
Matter enters the problem in electric machine support 6, will not make a further demand to the leakproofness of total.
Mentality of designing and principle is explained further.
Balance hole leakage rate (q) is calculated by following formula:
In formula: HpImpeller gesture lift, m；ζmSeal clearance resistance coefficient；ζBBalance hole resistance coefficient, usual ζB=2；
FmSeal clearance area of passage, m2；FBThe balance hole gross area, m2。
Balance hole equilibrant force (A1) calculation formula:
Gap Fm's pump becomes larger after a period of use, and balance hole equilibrant force A1 becomes smaller.
Practical axial force A (reality)=A (total)-A1-A (reaction force) is pumped, A1 becomes smaller, and A (reality) becomes larger.
After computation, in the case where guaranteeing pump normal parameter operation, replacement is equivalent to from relief hole pressure release by regulating valve
Expand FB, increase leakage rate q, the axial force A1 that impeller can balance also just increases.A (reality)=A (total)-A1-A (reaction
Power), A1 increases, then A (reality) becomes smaller, and is adjusted, and the continuous use time limit of pump is extended.
Finally, it is stated that above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, those skilled in the art should understand that, it can be to this
The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model
It encloses, should all cover in the scope of the claims of the utility model.
Claims (4)
1. vertical centrifugal pump axial force balance structure, including pump case (1) and vertical pump shaft (2), the upper end of the pump shaft (2) connects
Motor is connect, the lower end of the pump shaft (2) is protruded into the pump case (1) and connect with the impeller (3) in pump case (1) with band movable vane
(3) rotation is taken turns, downward, protrusion is equipped with a circle vane rings to the water inlet end (31) of the impeller (3) on the back shroud (32) of impeller (3)
(33), sealing opening ring (4) are equipped between the outside of vane rings (33) and pump case (1)；Back shroud (32) in vane rings (33)
Be formed with pressure chamber (16) between the pump case (1) of top, the back shroud (32) of pressure chamber (16) bottom if on offer
It does perforative balance hole (34), offers perforative relief hole (18) on the pump case (1) at the top of pressure chamber (16)；Its feature exists
In: the external adjusting pipeline (5) of relief hole (18), the adjusting pipeline (5) are equipped with pressure gauge (51) and regulating valve (52).
2. vertical centrifugal pump axial force balance structure according to claim 1, it is characterised in that: the pump case (1) have into
Water flow passage (13)；Adjusting pipeline (5) is connected at the outer wall of water inlet flow channel (13) of pump case (1), and by the pressure chamber
Room (16) is connected to water inlet flow channel (13).
3. vertical centrifugal pump axial force balance structure according to claim 2, it is characterised in that: the pump case (1) includes pump
Body (11) and pump cover (17), the pump cover (17) are detachably connected with the pump housing (11), and the water inlet flow channel (13) is provided with the pump housing
(11) in, the impeller (3) is located in the pump housing (11)；The pump cover (17) is located above impeller (3), under the pump shaft (2)
The impeller (3) in pump cover (17) the connection pump housing (11) is held, the sealing opening ring (4) is located at the lower surface of pump cover (17), institute
Back shroud (32) that pressure chamber (16) is formed in vane rings (33) is stated between the pump cover (17) of top, the relief hole
(18) it is provided on pump cover (17).
4. vertical centrifugal pump axial force balance structure according to claim 3, it is characterised in that: have on the pump housing (11)
Water inlet (12), the water inlet (12) is provided with the side of the pump housing (11) so that the pump housing (11) position below impeller (3) can
Closing setting, the water inlet (12) are connected to the water inlet end (31) of impeller (3) by water inlet flow channel (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920153886.1U CN209398624U (en) | 2019-01-29 | 2019-01-29 | Vertical centrifugal pump axial force balance structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920153886.1U CN209398624U (en) | 2019-01-29 | 2019-01-29 | Vertical centrifugal pump axial force balance structure |
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| Publication Number | Publication Date |
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| CN209398624U true CN209398624U (en) | 2019-09-17 |
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ID=67899217
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| CN201920153886.1U Active CN209398624U (en) | 2019-01-29 | 2019-01-29 | Vertical centrifugal pump axial force balance structure |
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| CN (1) | CN209398624U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848433A (en) * | 2019-12-13 | 2020-02-28 | 上海东方泵业集团南通有限公司 | Overpressure protection device for pipeline pump |
| CN112983894A (en) * | 2019-12-12 | 2021-06-18 | 亚什兰水泵无锡有限公司 | Axial force balance structure of vertical centrifugal pump |
| CN114233621A (en) * | 2021-12-17 | 2022-03-25 | 河北工程大学 | Irrigation water supply pump |
-
2019
- 2019-01-29 CN CN201920153886.1U patent/CN209398624U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983894A (en) * | 2019-12-12 | 2021-06-18 | 亚什兰水泵无锡有限公司 | Axial force balance structure of vertical centrifugal pump |
| CN110848433A (en) * | 2019-12-13 | 2020-02-28 | 上海东方泵业集团南通有限公司 | Overpressure protection device for pipeline pump |
| CN114233621A (en) * | 2021-12-17 | 2022-03-25 | 河北工程大学 | Irrigation water supply pump |
| CN114233621B (en) * | 2021-12-17 | 2023-04-25 | 河北工程大学 | Irrigation water supply pump |
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