CN114439756B

CN114439756B - Self-priming gas-liquid separation device of reinforced self-priming multistage centrifugal pump

Info

Publication number: CN114439756B
Application number: CN202210112454.2A
Authority: CN
Inventors: 陈锬
Original assignee: Jingjiang Yatai Pump Industry Co ltd
Current assignee: Jingjiang Yatai Pump Industry Co ltd
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2023-02-21
Anticipated expiration: 2042-01-29
Also published as: CN114439756A

Abstract

The invention relates to the technical field of gas-liquid separation devices, in particular to a gas-liquid separation device for enhancing self-priming of a self-priming multistage centrifugal pump, which comprises a pump shell, wherein a pump inlet and a pump outlet are fixedly communicated with the side end of the pump shell, a centrifugal guide vane shell is installed in the pump shell, a fixed ring sleeve is fixedly connected with the inner wall of the pump shell, and a defoaming component and a bubble splitting mechanism are connected with the inner side of the fixed ring sleeve.

Description

Self-priming gas-liquid separation device of reinforced self-priming multistage centrifugal pump

Technical Field

The invention relates to the technical field of gas-liquid separation devices, in particular to a self-priming gas-liquid separation device of an enhanced self-priming multistage centrifugal pump.

Background

The centrifugal pump is a fluid machine which transfers liquid by means of centrifugal force generated by rotation of an impeller, and is widely applied to the fields of urban sewage disposal, farmland irrigation, petroleum transportation, marine ships, chemical engineering and the like. Compared with an injection pump, the centrifugal pump has obvious advantages in the aspects of simple mechanical structure, rich application scenes and the like. The multistage centrifugal pump is characterized in that two or more single-stage centrifugal impellers are connected in series on a fluid structure to realize lift superposition, and the requirement of high lift in actual engineering is met. Especially, the small stainless steel multistage self-priming centrifugal pump has the advantage of low running noise.

The Chinese patent publication No. CN110025987A discloses a gas-liquid separation device for enhancing self-priming of a self-priming multi-stage centrifugal pump. The gas-liquid separation device is arranged inside the self-priming centrifugal pump and mainly comprises two parts: the device comprises an annular bracket and an annular spiral channel tightly attached to the annular bracket, wherein the surface of the spiral channel is uniformly coated with a hydrophobic material to form a hydrophobic surface annular spiral channel supported by the annular bracket; the gas-liquid separation device is arranged between the pump shell cavity and the pump shell, the inner ring and the outer ring are respectively and tightly attached to the cavity and the pump shell, fan-shaped openings are respectively arranged at the bottom of the top of the gas-liquid separation device, the top is an exhaust port, and the bottom is a water return port; the gas-liquid separation device is arranged in the area near the pump outlet, so that the exhaust port of the gas-liquid separation device is opposite to the pump outlet, and the water return port is positioned at the bottom of the water pump. Based on above retrieval, combine prior art discovery, the area of contact that present self-priming multistage centrifugal pump gas-liquid separation device and bubble are less for pump, lead to the bubble elimination effect not good, bubble later stage is ulcerated in aqueous and is harmd water pump interior components easily, and in addition, the bubble makes new gas more difficult get into the pump in, has reduced multistage centrifugal pump's working effect and life.

Disclosure of Invention

The invention aims to provide a self-priming-enhanced gas-liquid separation device of a self-priming multistage centrifugal pump, which aims to solve the problems in the background technology.

The technical scheme of the invention is as follows: the utility model provides a reinforcing is from inhaling formula multistage centrifugal pump from inhaling gas-liquid separation equipment, includes the pump case, the fixed intercommunication of side of pump case has pump inlet and pump outlet, the internally mounted of pump case has centrifugal stator shell, the inner wall fixedly connected with fixed ring cover of pump case, fixed ring cover is located one side that centrifugal stator shell is close to the pump inlet, the inboard of fixed ring cover is connected with defoaming subassembly and bubble and cuts the mechanism, the bubble cuts the mechanism and is located between defoaming subassembly and the pump inlet, fixed intercommunication has the air duct between defoaming subassembly and the pump case, the one end that defoaming subassembly was kept away from to the air duct runs through the pump case and is connected with the sealing member, defoaming subassembly is including supporting the net, attaches bubble net and one-way ventilative nethike, it has hydrophobic coating to support the net and the surface that attaches the bubble net all coats, support the equal fixed connection of net and one-way ventilative nethike, and be located between supporting net and the bubble and cut the mechanism, it is connected with supporting net and attaching bubble nethike between net to attach bubble net fixed connection, one-way ventilative nethike is empty core membrane for the air duct, it is linked together to run through supporting the net and is connected with ventilative nethike with the net to run through supporting the net.

Preferably, the bubble splitting mechanism comprises a bubble cutting assembly, a trigger and a bubble cutting spring group, the bubble cutting assembly is connected with the fixed ring sleeve, the trigger is connected with the bubble cutting assembly, and the bubble cutting spring group is connected with the fixed ring sleeve and is matched with the trigger.

Preferably, the bubble cutting assembly comprises a driving assembly and a cutting blade, the cutting blade is connected with the fixed ring sleeve through the driving assembly, and the trigger is connected with the driving assembly.

Preferably, the driving assembly comprises a rotating ring, a support frame, a rotating shaft and a cutting blade, the rotating ring is rotatably connected with the inner wall of the fixed ring sleeve, one end of the support frame is fixedly connected with the inner wall of the rotating ring, the other end of the support frame is fixedly connected with the rotating shaft, the cutting blade and the cutting blade are respectively fixedly connected to two end portions of the rotating shaft, the cutting blade is located on one side, close to the one-way breathable net film, of the rotating shaft, the trigger is connected with the rotating shaft, and the cutting blade is connected with bristles which are in contact with the bubble attaching grids.

Preferably, the trigger part includes the lantern ring and a plurality of post that triggers, the lantern ring is fixed cup joints in the outside of pivot, and is a plurality of the even fixed connection of one end of triggering the post is on the outer wall of lantern ring, the other end fixedly connected with spherical contact of triggering the post, surely bubble spring assembly offsets with spherical contact.

Preferably, surely steep spring assembly includes a plurality of first bubble cutting springs, and is a plurality of first bubble cutting spring is along the inner wall circumference evenly distributed of fixed ring cover, and the one end and the fixed ring cover fixed connection of first bubble cutting spring, the other end of first bubble cutting spring sets up and fixedly connected with contact block towards one side of pivot, contact block and trigger post contact.

Preferably, both sides of the first foam cutting spring are provided with a limiting slide set, the limiting slide set comprises a fixed slide plate and a movable slide plate, one end of the fixed slide plate is fixedly connected with the inner wall of the fixed ring sleeve, one end of the movable slide plate is fixedly connected with the contact block, and the fixed slide plate is in sliding fit with the movable slide plate.

Preferably, cut bubble spring unit still includes a plurality of second and cut the bubble spring, and is a plurality of second cuts bubble spring and a plurality of first and cuts bubble spring interval distribution, the one end of second cuts the bubble spring and the inner wall fixed connection of fixed ring cover, the other end fixedly connected with connecting block of second cut bubble spring, connecting block and one of them movable sliding plate fixed connection.

Preferably, cut bubble spring group and trigger piece and all correspond and be provided with the multiunit, and the first bubble spring that cuts on the multiunit bubble spring group distributes in a staggered way.

Preferably, the sealing member includes fender ring and baffle, the fixed cover of fender ring connects in the air duct outside, the baffle is located the mouth of pipe department of air duct, and baffle and keep off the fixedly connected with elastic component between the ring.

The invention provides a self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device through improvement, compared with the prior art, the device has the following improvement and advantages:

one is as follows: according to the invention, the defoaming component and the bubble splitting mechanism are additionally arranged on the pump shell, the bubble splitting mechanism is arranged between the defoaming component and the pump inlet, and after liquid enters the inner side of the pump shell from the pump inlet, larger bubbles are split into small bubbles through the bubble splitting mechanism, so that the damage to the internal structure of the equipment when the bubbles collapse is reduced; the small bubbles after cutting are partially eliminated through the defoaming component, so that the bubbles are reduced, the damage to the internal structure of the equipment caused by bubble collapse is further reduced, the new gas can smoothly enter the pump, the self-priming effect of the self-priming multistage centrifugal pump is enhanced, and the working efficiency of the multistage centrifugal pump is improved;

the second step is as follows: the invention sets the unidirectional air-permeable net film into a bag-shaped hollow film by fixedly communicating the air duct between the defoaming component and the pump shell, and the air duct penetrates through the supporting grid and is communicated with the unidirectional air-permeable net film, the small air bubbles after cutting are attached to the bubble attaching grids, air in the air bubbles enters the one-way breathable net film and is discharged outwards through the air guide pipe, and the supporting grids and the bubble attaching grids play a role in supporting the one-way breathable net film;

and thirdly: according to the invention, one end of the air guide pipe, which is far away from the defoaming assembly, penetrates through the pump shell and is connected with the sealing piece comprising the baffle plate, when gas passes through the pump shell, the baffle plate is opened outwards under the impact action of air flow, and when no gas passes through the pump shell, the elastic telescopic rod enables the baffle plate to seal the pipe orifice of the air guide pipe, so that sundries are prevented from entering and blocking the air guide pipe;

fourthly, the method comprises the following steps: according to the invention, the bubble cutting mechanism comprising the bubble cutting assembly, the trigger and the bubble cutting spring group is arranged, the bubble cutting assembly is used for cutting bubbles and further cutting the bubbles by driving the bubble cutting spring group through the trigger, the first bubble cutting spring and the second bubble cutting spring both adopt compression springs, and the second bubble cutting spring is matched with the first bubble cutting spring to perform synchronous repeated compression and reset actions in a process, so that the bubbles attached to the surface of the second bubble cutting spring can be extruded and cut, large bubbles are extruded into smaller bubbles, and the damage to the internal structure of the equipment caused by bubble collapse is reduced;

and the fifth step: according to the invention, the limiting sliding groups comprising the fixed sliding plate and the movable sliding plate are arranged on the two sides of the first foam cutting spring, the fixed sliding plate is in sliding fit with the movable sliding plate, the fixed sliding plate and the movable sliding plate are in a fit action, so that the first foam cutting spring is prevented from being deformed by force in the non-working direction, the first foam cutting spring is better protected, and in addition, the movable sliding plate and the connecting block are in a fit action, so that the second foam cutting spring is matched with the first foam cutting spring to synchronously and repeatedly compress and reset.

Drawings

The invention is further explained below with reference to the figures and examples:

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of a cutaway structure of the present invention;

FIG. 3 is a schematic view of the structure at the airway tube of the present invention;

FIG. 4 is a schematic view of the structure at the bubble removal assembly of the present invention;

FIG. 5 is a schematic perspective view of the bubble slitting mechanism of the present invention;

FIG. 6 is a schematic perspective view of the drive assembly of the present invention;

FIG. 7 is a schematic perspective view of the trigger of the present invention;

fig. 8 is a perspective view of the bubble cutting spring set according to the present invention.

Description of reference numerals:

1. a pump housing; 2. a pump inlet; 3. an outlet of the pump; 5. fixing the loop; 6. a bubble splitting mechanism; 61. cutting the bubble assembly; 611. a rotating ring; 612. a support frame; 613. a rotating shaft; 614. a blade; 615. cutting the slices; 62. a trigger; 621. a collar; 622. a trigger post; 623. a spherical contact; 63. cutting the foam spring set; 631. a first blister spring; 632. a contact block; 633. a second bulb cutting spring; 634. connecting blocks; 64. a limiting sliding group; 641. fixing a sliding plate; 642. a movable sliding plate; 8. an air duct; 9. a seal member; 91. a baffle ring; 92. a baffle plate; 93. an elastic member; 10. a support grid; 11. attaching bubble grids; 12. a one-way breathable net film.

Detailed Description

The present invention is described in detail below, and technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a self-priming gas-liquid separation device of an enhanced self-priming multistage centrifugal pump by improvement, and the technical scheme of the invention is as follows:

as shown in fig. 1-8, a self-priming enhanced multi-stage centrifugal pump comprises a pump casing 1, a pump inlet 2 and a pump outlet 3 are fixedly communicated with the side end of the pump casing 1, a centrifugal guide vane housing is installed inside the pump casing 1, a fixing ring sleeve 5 is fixedly connected to the inner wall of the pump casing 1, and the fixing ring sleeve 5 can be fixed to the inner wall of the pump casing 1 by any fixing method in the prior art, such as welding or fixing by using screws.

The fixed ring sleeve 5 is positioned on one side, close to the pump inlet 2, of the centrifugal guide vane shell, the inner side of the fixed ring sleeve 5 is connected with a defoaming assembly and a bubble splitting mechanism 6, and the bubble splitting mechanism 6 is positioned between the defoaming assembly and the pump inlet 2; liquid enters the inner side of the pump shell 1 from the pump inlet 2, and larger bubbles are cut into small bubbles through the bubble cutting mechanism 6, so that the damage to the internal structure of the equipment when the bubbles collapse is reduced; the small bubbles after cutting are eliminated through the defoaming assembly part, and the bubbles are reduced, so that the damage to the internal structure of the equipment caused by bubble collapse is further reduced, the new gas can smoothly enter the pump, the self-priming action of the self-priming multistage centrifugal pump is enhanced, and the working efficiency of the multistage centrifugal pump is improved.

Specifically, an air duct 8 is fixedly communicated between the defoaming assembly and the pump case 1, one end, far away from the defoaming assembly, of the air duct 8 penetrates through the pump case 1 and is connected with a sealing piece 9, the defoaming assembly comprises a support grid 10, a bubble attaching grid 11 and a one-way breathable net film 12, the surfaces of the support grid 10 and the bubble attaching grid 11 are coated with hydrophobic coatings, the support grid 10 and the one-way breathable net film 12 are fixedly connected to the inner wall of the fixed ring sleeve 5, the one-way breathable net film 12 is located between the support grid 10 and the bubble splitting mechanism 6, the bubble attaching grid 11 is fixedly connected between the support grid 10 and the bubble attaching grid 11, the one-way breathable net film 12 is a bag-shaped hollow film, and the air duct 8 penetrates through the support grid 10 and is communicated with the one-way breathable net film 12; the small air bubbles after cutting are attached to the bubble attaching grids 11, air in the air bubbles enters the one-way ventilating net film 12 and is discharged outwards through the air guide pipe 8, and the supporting grids 10 and the bubble attaching grids 11 support the one-way ventilating net film 12.

Further, the bubble splitting mechanism 6 comprises a bubble cutting assembly 61, a trigger 62 and a bubble cutting spring set 63, wherein the bubble cutting assembly 61 is connected with the fixed ring sleeve 5, the trigger 62 is connected with the bubble cutting assembly 61, and the bubble cutting spring set 63 is connected with the fixed ring sleeve 5 and is matched with the trigger 62; the bubble cutting assembly 61 cuts the bubbles, and the trigger 62 drives the bubble cutting spring set 63 to further cut the bubbles.

Further, the bubble cutting assembly 61 comprises a driving assembly and a cutting blade 615, the cutting blade 615 is connected with the fixing ring sleeve 5 through the driving assembly, and the trigger 62 is connected with the driving assembly; the driving assembly comprises a rotating ring 611, a supporting frame 612, a rotating shaft 613 and blades 614, the rotating ring 611 is rotatably connected with the inner wall of the fixed ring sleeve 5, one end of the supporting frame 612 is fixedly connected with the inner wall of the rotating ring 611, the other end of the supporting frame 612 is fixedly connected with the rotating shaft 613, the blades 614 and cutting blades 615 are respectively and fixedly connected with two end parts of the rotating shaft 613, the cutting blades 615 are positioned on one side of the rotating shaft 613, which is close to the one-way breathable net film 12, the trigger 62 is connected with the rotating shaft 613, and the cutting blades 615 are connected with bristles which are in contact with the bubble-attached net 11; the blades 614 are driven to rotate in the process of liquid entering the pump, the blades 614 drive the cutting blade 615 to rotate through the rotating shaft 613, the supporting frame 612 and the rotating ring 611, the cutting blade 615 cuts air bubbles, and meanwhile the bristles can prevent the bubble-attached grid 11 from being blocked.

Further, the trigger member 62 includes a collar 621 and a plurality of trigger columns 622, the collar 621 is fixedly sleeved on the outer side of the rotating shaft 613, one ends of the plurality of trigger columns 622 are uniformly and fixedly connected to the outer wall of the collar 621, the other ends of the trigger columns 622 are fixedly connected with spherical contacts 623, and the bubble cutting spring set 63 abuts against the spherical contacts 623; the bubble cutting spring set 63 includes a plurality of first bubble cutting springs 631, the plurality of first bubble cutting springs 631 are uniformly distributed along the circumference of the inner wall of the fixed ring sleeve 5, one end of each first bubble cutting spring 631 is fixedly connected with the fixed ring sleeve 5, the other end of each first bubble cutting spring 631 faces one side of the rotating shaft 613 and is fixedly connected with a contact block 632, the length of each contact block 632 is greater than the diameter of the trigger post 622, and the trigger posts 622 are in contact with each other; the vane 614 drives the cutting blade 615 to cut bubbles through the rotating shaft 613, the support frame 612 and the rotating ring 611, the rotating shaft 613 drives the collar 621 and the trigger post 622 to rotate synchronously, the spherical contact 623 on the trigger post 622 intermittently presses the contact block 632, the contact block 632 presses the first bubble cutting spring 631, the first bubble cutting spring 631 adopts a compression spring, the first bubble cutting spring 631 can press and break bubbles attached to the surface thereof to squeeze large bubbles into smaller bubbles during repeated compression and resetting actions, in addition, in the flowing process of the liquid, the liquid close to the first bubble cutting spring 631 is hindered by the first bubble cutting spring 631, so that the pressure of the liquid far away from the first bubble cutting spring 631 is relatively large, the liquid far away from the first bubble cutting spring 631 flows towards the first bubble cutting spring 631 with the bubbles under the action of the pressure difference, and is better contacted with the first bubble cutting spring 631, so that a better bubble cutting action is achieved, and damage to the internal structure of the device caused by bubble collapse is reduced.

Furthermore, both sides of the first bubble cutting spring 631 are provided with a limit sliding set 64, the limit sliding set 64 comprises a fixed sliding plate 641 and a movable sliding plate 642, one end of the fixed sliding plate 641 is fixedly connected with the inner wall of the fixed ring sleeve 5, one end of the movable sliding plate 642 is fixedly connected with the contact block 632, and the fixed sliding plate 641 is in sliding fit with the movable sliding plate 642; the fixed slide plate 641 and the movable slide plate 642 cooperate to prevent the first bubble cutting spring 631 from deforming due to a force in a non-working direction, thereby better protecting the first bubble cutting spring 631.

Further, the bubble cutting spring set 63 further includes a plurality of second bubble cutting springs 633, the second bubble cutting springs 633 and the first bubble cutting springs 631 are distributed at intervals, one end of each second bubble cutting spring 633 is fixedly connected with the inner wall of the fixed ring sleeve 5, the other end of each second bubble cutting spring 633 is fixedly connected with a connecting block 634, and the connecting block 634 is fixedly connected with one of the movable sliding plates 642; when the contact block 632 presses the first bubble cutting spring 631, the movable sliding plate 642 carries the second bubble cutting spring 633 to be synchronously compressed through the connecting block 634, and the second bubble cutting spring 633 can better cut bubbles in cooperation with the first bubble cutting spring 631.

Further, surely, bubble spring unit 63 all corresponds with trigger 62 and is provided with the multiunit, and the multiunit surely bubble spring 631 crisscross distribution on the spring unit 63 of bubbling, and the defoaming is more even and comprehensive, further reduces the bubble and bursts out the damage that causes equipment inner structure.

Furthermore, the sealing element 9 includes a baffle ring 91 and a baffle plate 92, the baffle ring 91 is fixedly sleeved outside the air duct 8, the baffle plate 92 is located at the pipe orifice of the air duct 8, and an elastic element 93, such as an elastic telescopic rod, is fixedly connected between the baffle plate 92 and the baffle ring 91, when gas needs to pass through, the baffle plate 92 is opened outwards under the impact action of the gas flow, and when no gas needs to pass through, the elastic telescopic rod enables the baffle plate 92 to seal the pipe orifice of the air duct 8, so as to prevent sundries from entering and blocking the air duct 8.

The working principle is as follows: liquid enters the inner side of the pump shell 1 from the pump inlet 2, and larger bubbles are cut into small bubbles through the bubble splitting mechanism 6, so that the damage to the internal structure of the equipment caused by the burst of the bubbles is reduced; the small cut bubbles are partially eliminated by the defoaming assembly, so that the bubbles are reduced, the damage of bubble collapse to the internal structure of the equipment is further reduced, the new gas can smoothly enter the pump, the self-priming effect of the self-priming multistage centrifugal pump is enhanced, and the working efficiency of the multistage centrifugal pump is improved; the bubble cutting mechanism 6 comprising the bubble cutting assembly 61, the trigger 62 and the bubble cutting spring set 63 is arranged, the bubble cutting assembly 61 cuts bubbles, the trigger 62 drives the bubble cutting spring set 63 to further cut bubbles, the first bubble cutting spring 631 and the second bubble cutting spring 633 both adopt compression springs, the second bubble cutting spring 633 is matched with the first bubble cutting spring 631 to perform the actions of pressing and breaking bubbles attached to the surface of the second bubble cutting spring in the process of synchronously repeating the compression and reset actions, large bubbles are pressed into smaller bubbles, in addition, in the flowing process of liquid, the liquid close to the first bubble cutting spring 631 is blocked by the first bubble cutting spring 631, so that the pressure of the liquid far away from the first bubble cutting spring 631 is relatively large, under the action of pressure difference, the liquid far away from the first bubble cutting spring 631 carries the bubbles to flow towards the first bubble cutting spring 631, and is better contacted with the first bubble cutting spring 631, so that a better bubble cutting effect is achieved, and damage to the internal structure of the device caused by bubble collapse is reduced; the limit sliding sets 64 comprising the fixed sliding plate 641 and the movable sliding plate 642 are arranged on the two sides of the first bubble cutting spring 631, the fixed sliding plate 641 is in sliding fit with the movable sliding plate 642, the fixed sliding plate 641 and the movable sliding plate 642 are in cooperation to avoid the deformation of the first bubble cutting spring 631 in the non-working direction, the first bubble cutting spring 631 is better protected, in addition, the movable sliding plate 642 and the connecting block 634 are in cooperation to enable the second bubble cutting spring 633 to be matched with the first bubble cutting spring 631 to synchronously and repeatedly compress and reset; through fixed intercommunication air duct 8 between defoaming subassembly and pump case 1, set up unidirectional ventilative nethike embrane 12 into the hollow membrane of sacculus to run through support net 10 with air duct 8 and be linked together with unidirectional ventilative nethike embrane 12, the small bubble after cutting is attached to on attaching bubble nethike embrane 11, and the gas in the bubble gets into unidirectional ventilative nethike embrane 12 and outwards discharges via air duct 8, and wherein, support net 10 and attach bubble nethike 11 and play the effect of support to unidirectional ventilative nethike embrane 12.

The previous description is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an enhancement is from inhaling gas-liquid separation equipment of formula multistage centrifugal pump from inhaling, includes pump case (1), the fixed intercommunication of side of pump case (1) has pump inlet (2) and pump outlet (3), the internally mounted of pump case (1) has centrifugal stator shell, its characterized in that: the inner wall of the pump shell (1) is fixedly connected with a fixed ring sleeve (5), the fixed ring sleeve (5) is positioned on one side of the centrifugal guide vane shell close to the pump inlet (2), the inner side of the fixed ring sleeve (5) is connected with a defoaming component and a bubble splitting mechanism (6), the bubble splitting mechanism (6) is positioned between the defoaming component and the pump inlet (2), an air duct (8) is fixedly communicated between the defoaming component and the pump shell (1), one end of the air duct (8) far away from the defoaming component penetrates through the pump shell (1) and is connected with a sealing piece (9), the defoaming component comprises a supporting grid (10), a bubble attaching grid (11) and a one-way ventilating net film (12), the surfaces of the supporting grids (10) and the bubble-attached grids (11) are coated with hydrophobic coatings, the supporting grids (10) and the one-way breathable net film (12) are both fixedly connected on the inner wall of the fixed ring sleeve (5), the one-way breathable net film (12) is positioned between the supporting grids (10) and the bubble splitting mechanism (6), and the one-way breathable net film (12) is fixedly connected between the supporting grid (10) and the bubble attaching grid (11), the one-way breathable net film (12) is a saccular hollow film, and the air duct (8) penetrates through the supporting grid (10) and is communicated with the inside of the one-way breathable net film (12).

2. The apparatus of claim 1 for enhancing self-priming of a self-priming multistage centrifugal pump, wherein: bubble cuts mechanism (6) including cutting bubble subassembly (61), trigger piece (62) and cutting bubble spring assembly (63), cut bubble subassembly (61) and fixed ring cover (5) are connected, trigger piece (62) are connected with cutting bubble subassembly (61), cut bubble spring assembly (63) and fixed ring cover (5) are connected and with trigger piece (62) looks adaptation.

3. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 2, wherein: cut bubble subassembly (61) including drive assembly and cutting piece (615), cutting piece (615) are connected with fixed ring cover (5) through drive assembly, trigger piece (62) are connected with drive assembly, be connected with the brush hair that contacts and attach bubble net (11) on cutting piece (615).

4. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 3, wherein: the driving assembly comprises a rotating ring (611), a supporting frame (612), a rotating shaft (613) and vanes (614), the rotating ring (611) is rotatably connected with the inner wall of a fixed ring sleeve (5), one end of the supporting frame (612) is fixedly connected with the inner wall of the rotating ring (611), the other end of the supporting frame (612) is fixedly connected with the rotating shaft (613), the vanes (614) are fixedly connected with one end of the rotating shaft (613), a cutting blade (615) is fixedly connected with the other end of the rotating shaft (613), the cutting blade (615) is located on one side, close to the one-way breathable net film (12), of the rotating shaft (613), and the triggering piece (62) is connected with the rotating shaft (613).

5. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 4, wherein: trigger piece (62) are including lantern ring (621) and a plurality of trigger post (622), lantern ring (621) fixed cover connect in the outside of pivot (613), and is a plurality of the even fixed connection of one end in trigger post (622) is on the outer wall of lantern ring (621), the other end fixed connection of trigger post (622) has spherical contact (623), bubble cutting spring assembly (63) offsets with spherical contact (623).

6. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 5, wherein: cut bubble spring assembly (63) including a plurality of first bubble cutting springs (631), it is a plurality of first bubble cutting springs (631) are along the inner wall circumference evenly distributed of fixed ring cover (5), and the one end and the fixed ring cover (5) fixed connection of first bubble cutting springs (631), the other end of first bubble cutting springs (631) sets up and fixedly connected with contact piece (632) towards one side of pivot (613), contact piece (632) contact with trigger post (622).

7. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 6, wherein: both sides of first bubble spring (631) all are provided with spacing smooth group (64), spacing smooth group (64) are including deciding slide (641) and moving slide (642), decide the inner wall fixed connection of the one end of slide (641) and fixed ring cover (5), move the one end and contact piece (632) fixed connection of slide (642), decide slide (641) and move slide (642) cooperation of sliding.

8. The apparatus of claim 7 for enhancing self-priming of a self-priming multistage centrifugal pump, wherein: the bubble cutting spring set (63) further comprises a plurality of second bubble cutting springs (633), the second bubble cutting springs (633) and the first bubble cutting springs (631) are distributed at intervals, one end of each second bubble cutting spring (633) is fixedly connected with the inner wall of the fixed ring sleeve (5), the other end of each second bubble cutting spring (633) is fixedly connected with a connecting block (634), and the connecting block (634) is fixedly connected with one movable sliding plate (642) of the connecting blocks.

9. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 6, wherein: cut bubble spring assembly (63) and trigger piece (62) and all correspond and be provided with the multiunit, and first cut bubble spring (631) crisscross distribution on the multiunit cut bubble spring assembly (63).

10. The self-priming enhanced multi-stage centrifugal pump self-priming gas-liquid separation device of claim 1, wherein: sealing member (9) are including keeping off ring (91) and baffle (92), keep off ring (91) fixed cover and connect in the air duct (8) outside, baffle (92) are located the mouth of pipe department of air duct (8), and fixedly connected with elastic component (93) between baffle (92) and the fender ring (91).