CN201739221U - Rotary-shell pump adopting rectangular spiral labyrinth dynamic sealing on impeller hub - Google Patents

Abstract

The utility model relates to a rotary-shell pump adopting rectangular spiral labyrinth dynamic sealing on an impeller hub, which is characterized in that a flow collecting pipe is positioned in a liquid in a rotary shell, an impeller is placed in the liquid, the impeller is connected with the rotary shell, the rotary shell is connected with a rotary motor, the flow collecting pipe is connected with a flow-collecting outlet pipe, a stator is installed on the flow-collecting outlet pipe, a rotor is assembled on the impeller hub, the rotor is matched with the stator, multi-head spiral threads are arranged on the matched surfaces of the rotor and the stator, and the teeth of the threads are rectangular. The utility model has the advantages that: the sealing pressure generated by a rectangular spiral slot is lower than that of other tooth-shaped spiral slots, the consumed power is the least, the adaptability is strong, the sealing effect is good, and the leakage problem of a fluid between the rotary shell and an impeller inlet is solved. A gap is left between the matched surfaces and belongs to noncontact sealing, and the utility model has feasible manufacturing process, simple structure, long service life and smaller frictional resistance and can effectively improve the efficiency of the rotary-shell pump. According to different pump types, the efficiency at least can be improved by more than 3 percent and up to 6 percent.

Description

Adopt the rotary case pump of rectangular coil labyrinth dynamic seal on the impeller hub

Technical field

The utility model relates to a kind of rotary case pump that adopts rectangular coil labyrinth dynamic seal on impeller hub, specifically is the low-flow high-lift rotary case pump that adopts rectangular coil labyrinth dynamic seal between a kind of impeller hub and the afflux outer pipe.Belong to the pump technical field.

Background technique

The pump series products mainly contains centrifugal pump, mixed flow pump, axial-flow pump, peripheral pump and reciprocating pump etc. and have type spectrum coverage area comparatively widely, but in small flow, high-lift scope, still do not have comparatively desirable product.The product of using in this field mostly is high speed pump, multistage pump and reciprocating pump greatly, the then bulky heaviness of high speed pump, multistage pump and reciprocating pump, easily damaged parts is many, maintenance expenses is high, workload is big and cost an arm and a leg, the reciprocating pump outlet pressure has pulsation can't satisfy most of industrial needs, centrifugal pump is under small flow, high-lift working condition, efficient is low, power consumption is high, should not promote the use of.And rotary-jet pump impeller and revolve shell (being equivalent to the pump housing) rotation has synchronously successfully avoided accounting for the disc friction of loss large percentage in low specific speed pump, makes its efficient more much higher than the efficient of general low specific-speed centrifugal pump.

Rotary-jet pump is a kind of small flow of function admirable, high-lift low specific-speed centrifugal pump, especially is fit to specific speed and is using below 30.The main working parts of this pump is a rotor and the static header pipe that shell is formed that revolves by impeller and rotation synchronously.The fluid that flows into obtains energy under the impeller action of centrifugal force, make and enter the kinetic energy and the pressure energy that revolve the fluid in the shell and be improved, this fluid is under the drive of rotary shell simultaneously, with revolve shell and rotate synchronously, reach maximum value at the inwall place liquid speed that revolves shell, static header pipe is collected the fluid at this place, and the speed of fluid further is converted into the pressure energy, and pump can produce very high lift thus.

In this working procedure, the fluid that revolves in the shell remains the pressure higher state, and impeller inlet is in low-pressure state under the pumping action of impeller blade.Like this, revolve shell-side fluid and impeller inlet and have bigger pressure reduction.The afflux outer pipe passes impeller hub and impeller inlet on the structure, the afflux outer pipe is static, impeller rotates, and has dynamic and static junction plane like this between afflux outer pipe and the impeller hub, must have the gap to closing face, form flow channels, just have pressure reduction stream under the effect of pressure reduction, pressure reduction stream is that fluid returns impeller inlet by the mode of leaking after impeller obtains energy, belongs to improper and flows, be leakage loss, loss causes the decrease in efficiency of pump.This leakage flow is got back to impeller inlet simultaneously, has changed the normal flowing state of impeller inlet, causes flowing in the impeller worsening, and causes bigger flow losses, and the efficient of pump is further descended.So the leakage flow that stops this place is a key issue.At present, general structural design is by reducing to closing the face path clearance, to reduce leakage rate; Perhaps adopt particular form, by on-line retrieval, " a kind of rotary case pump that on liquid collecting pipe, adopts the maze trough structure " of relevant patent such as patent No. ZL200620074531.6, invented at the rotor inner cap and cooperate the installation place to adopt step type maze trough structure with liquid collecting pipe, can reduce the rotor intracavity liquid and flow to rotor inlet place.These methods are static, are by increasing flow resistance, reaching the purpose that reduces leakage rate in principle.But be subject to processing, the restriction of factor such as assembling, give close the face path clearance can not accomplish very little, thereby, leak and still exist, can not eliminate fully.Have only the mode that adopts dynamic seal, could stop leakage loss fully, thereby further improve the efficient of pump, this also is the main and valid approach that rotary case pump is raised the efficiency.

Summary of the invention

The utility model proposes a kind of the employing at impeller inlet under the condition that factors such as the rotary case pump of adopting spiral labyrinth dynamic seal, its purpose are intended to process, assembling allow, eliminate fully and give the leakage loss of closing in the face path clearance, thereby improve the efficient of pump effectively.

Technical solution of the present utility model: it is characterized in that header pipe is in the liquid that revolves in the shell, impeller is arranged in the liquid, impeller with revolve shell and connect, revolve the shell joint electric rotating machine, header pipe is connected with the afflux outer pipe, on the afflux outer pipe stator is housed, on impeller hub, be assembled with rotor, rotor matches with stator, turning multi-head spiral screw thread on the fitting surface of rotor and stator, and the profile of tooth of this screw thread is a rectangle, the square threaded form parameter-definition is: a=1～3.5mm, b=1.5～5.5mm, h=1.5～4.5mm, z=15～40, α=60 °～85 °, c=0.08～0.8mm, a in the formula represent that the spiral shell rib is wide, and b represents that screw channel is wide, h represents groove depth, z represents number of starts, and α represents the thread helix lift angle, and c represents the one-sided gap of fitting surface between stator and the rotor.

Advantage of the present utility model: at impeller inlet and revolve between the shell and to adopt rectangular coil labyrinth dynamic seal, the sealing load that the rectangular coil groove is produced is low than the spiral chute of other castellated shape, the consumed power minimum, adaptability is strong, good sealing effect has solved the leakage problem that revolves fluid between shell and the impeller inlet.The dynamic seal of rectangular coil labyrinth is to realize by the forward and reverse screw of bull of turning on rotor, the stator fitting surface, gapped between the fitting surface, belong to untouchable sealing, thereby manufacturing process is feasible, simple in structure, long service life, and have less surface friction drag, can improve the efficient of rotary case pump effectively.According to pump type difference, can raise the efficiency more than 3% at least, be up to 6%, research energy-saving and high efficient rotary case pump there is significance.

Description of drawings

Accompanying drawing 1 is a generalized section of the present utility model.Accompanying drawing 2 is A enlarged views among Fig. 1.

The body structure schematic representation of rectangular coil labyrinth shown in the accompanying drawing 3.The figure of square threaded form geometric parameter shown in the accompanying drawing 4.

1 is to revolve shell, the 2nd among Fig. 1, and header pipe, the 3rd revolves the liquid, the 4th in the shell, impeller, the 5th, impeller inlet, the 6th, afflux outer pipe, the 7th, pump inlet, the 8th, rotor, the 9th, stator, the 10th, the gap between rotor and the stator.

Embodiment

Contrast Fig. 1, Fig. 2, Fig. 3 and Fig. 4, its structure is that header pipe 2 is in the liquid 3 that revolves in the shell 1, impeller 4 is arranged in the liquid 3, impeller 4 with revolve shell 1 and connect, revolve shell 1 and connect electric rotating machine, header pipe 2 is connected with afflux outer pipe 6, stator 9 is housed on afflux outer pipe 6, is assembled with rotor 8 on impeller 4 wheel hubs, rotor 8 matches with stator 9, on the fitting surface of rotor 8 and stator 9 turning the multi-head spiral screw thread, the profile of tooth of screw thread is a rectangle.

During work, the liquid 3 that enters from pump inlet 7 is under the effect of impeller 4, and the liquid 3 that obtains energy enters and revolves in the shell 1, and the liquid 3 that revolves in the shell 1 is revolving under shell 1 drives, and revolves shell 1 and rotates synchronously, and at this moment, liquid 3 has higher kinetic energy and pressure energy.The liquid of impeller inlet 5 is under the pumping action of impeller 4, and pressure is lower, like this, forms pressure reduction between liquid 3 and the impeller inlet 5 in revolving shell 1, under the effect of this pressure reduction, will produce leakage flow by gap 10.The leakage flow that produces in order to stop, on rotor 8 and stator 9 fitting surfaces, be provided with the opposite rectangular coil screw thread of bull rotation direction, drive rotor 8 rotations by impeller 4, rotor 8 sense of rotation and self square threaded form spiral shell are on the contrary, like this in rotor 8 rotary courses, rectangular coil groove on the rotor 8 applies active force to the liquid in the groove: promoting the liquid overcome friction makes circular movement on the one hand, also promoting liquid on the other hand advances vertically, like this on the liquid of frictional force action in groove that liquid is produced by viscosity, make it to produce axial back-pressure, the line shaft of rotor 8 and 9 pairs of liquid of stator has just formed the pumping pressure of rectangular coil labyrinth body to thrust, certainly, owing to revolve the pressure that interior liquid 3 pressure of shell are higher than impeller inlet 5, under the effect of pressure reduction, the spiral chute Clearance Flow along rotor and stator composition forms pressure reduction stream, the pump flow that produces when rectangular coil labyrinth body just can stop the leakage of fluid effectively greater than by the time when pressure reduction flows.

Rectangular coil labyrinth physical efficiency produces more excellent big pumping pressure, and the square threaded form definition: the spiral shell rib is wide to be represented with a, and screw channel is wide to be represented with b, groove depth is represented with h, number of starts represents that with z the thread helix lift angle represents that with α the one-sided gap of the fitting surface between stator and the rotor is represented with c.Square threaded form parameter-definition: a=1～3.5mm, b=1.5～5.5mm, h=1.5～4.5mm, z=15～40, α=60 °～85 °, c=0.08～0.8mm.

Claims (1)

1. adopt the rotary case pump of rectangular coil labyrinth dynamic seal on the impeller hub, it is characterized in that header pipe is in the liquid that revolves in the shell, impeller is arranged in the liquid, impeller with revolve shell and connect, revolve the shell joint electric rotating machine, header pipe is connected with the afflux outer pipe, on the afflux outer pipe, stator is housed, be assembled with rotor on impeller hub, rotor matches with stator, turning multi-head spiral screw thread on the fitting surface of rotor and stator, the profile of tooth of this screw thread is a rectangle, the square threaded form parameter-definition is: a=1～3.5mm, b=1.5～5.5mm, h=1.5～4.5mm, z=15～40, α=60 °～85 °, c=0.08～0.8mm, in the formula

A represents that the spiral shell rib is wide,

B represents that screw channel is wide,

H represents groove depth,

Z represents number of starts,

α represents the thread helix lift angle,

C represents the one-sided gap of fitting surface between stator and the rotor.

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