CN1109825C

CN1109825C - High-speed centrifugal pump

Info

Publication number: CN1109825C
Application number: CN 00109918
Authority: CN
Inventors: 鄢平安
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-14
Filing date: 2000-07-14
Publication date: 2003-05-28
Anticipated expiration: 2020-07-14
Also published as: CN1334407A

Abstract

The present invention relates to a centrifugal pump, particularly to a sealing structure of a high-speed centrifugal pump. The present invention aims to solve the problems that the sealing property of the existing centrifugal pump is poor and the existing centrifugal pump is easy to be silted by mud and sand. The centrifugal pump is composed of a pump casing 1 comprising a front end cover 3 and a rear end cover 4, an auxiliary impeller 26 connected with an impeller 5, a sealing stator 6 and an impeller shaft 29, wherein a seal structure at an operating gap of the impeller is provided with an anti-rotary shielding seal of a suction port, a labyrinth seal, a shielding spiral pump seal of the impeller, and a blocking spiral pump seal of the impeller which are arranged at the front side of the impeller, a shielding spiral pump seal of the auxiliary impeller, a blocking spiral pump seal of the auxiliary impeller, a shielding spiral pump seal of the impeller, a blocking spiral pump seal of the impeller, and a labyrinth seal which are arranged at the rear side of the impeller, and a drain outlet seal of the impeller.

Description

High speed centrifugal pump

Technical field

The present invention relates to centrifugal pump, particularly the sealing configuration of single suction single-stage high speed centrifugal pump.

Background technique

Existing centrifugal pump, high speed centrifugal pump, its main structure are that the impeller shaft that links by pump case and impeller wherein and with power transmission and bearing thereof etc. constitute.Its sealing multiaction packing seal, multiple structures such as mechanical seal, sub-propeller sealing.Sub-propeller sealing wherein, just like the centrifugal pump of in CN2084114, announcing, constitute impeller by front shroud, primary blades, back shroud, with with the into a single integrated structure sub-propeller of impeller, sub-propeller is by back shroud, the auxiliary coverplate of impeller, constitute with the radially back blades that is rib shape on the auxiliary coverplate, form the sub-propeller sealing.The two common formation of shaft sealing of sub-propeller sealing and filling-material structure mix sealing mechanism.The sealed characteristic of this mixing sealing structure face is: in the running of centrifugal pump, between the sub-propeller central part of side behind the impeller and shaft sealing, form negative cavity, leak and flow into fluid in the negative pressure wrist from impeller periphery, the sub-propeller that is rotated sucks, the running clearance of arranging again to impeller periphery also returns in the running chamber again, reaches the purpose of sealing.The power consumption penalty of sealing is made of sub-propeller dynamic seal loss and contact seal frictional loss.Its power consumption is failed to keep an appointment and is 5～15% of air horsepower, so power consumption is high.

The running clearance of existing centrifugal pump between suction eye front-end face and intake pipe hole wall interior edge face do not have sealing and is the passage of straight-through type, as CN2084114, the centrifugal pump sealing configuration of announcing among the CN2355149, prominent pipe before the impeller front end all has one section, between the interior edge face of the water inlet of the front-end face of preceding prominent pipe and front cover, form perpendicular to the impeller axis ringwise running clearance.This running clearance communicates with the intake pipe runner.Because the existence of annular running clearance, when the impeller high speed rotating, under the drive of impeller, produce the rotating vortex identical with the impeller rotation direction at suction eye inner chamber to the fluid of intake pipe section thereupon, the suction effect of impeller is reduced.In addition, the floating twister in the fluid is easy to enter in the impeller and silts runner up, and during shutdown, the mud in the fluid, sand and solid particle are easy to sink to and silt the moving gap of changeing up, form to silt resistance up, influence the starting performance of centrifugal pump.

Summary of the invention

Given this, the object of the present invention is to provide the good high speed centrifugal pump of a kind of sealability.

The present invention is according to fluid flow characteristics and volute pump technology, adopts before and after impeller side that the shielding volute pump sealing of impeller and retardance volute pump are set and seals and realize its purpose; And the shielding volute pump that sub-propeller further is set seals, the sealing of retardance volute pump, labyrinth seal, and the anti-shield gasket that revolves of suction port, drain opening seals and realizes its purpose; Impeller parking sealer mechanism further is set on impeller shaft again realizes its purpose.To obtain excellent sealing effect.

High speed centrifugal pump of the present invention (referring to accompanying drawing), comprise the pump case 1 that connects front cover 3 and rear end cover 4 formation scroll casing shapes, the sub-propeller 26 that impeller 5 in the pump case and impeller rear end are connected, the sealed stator 6 that links to each other with pump case between sub-propeller and the rear end cover, respectively with pump case in the front side and the pump chamber isolating ring 10 that joins of rear side in week, the impeller shaft 29 that links to each other with impeller, it is characterized in that having water conservancy diversion spiral 18 by the axial wing 17 of the annular of impeller and periphery thereof to be sleeved in the radome 15 of annular at the front side of impeller and rear side cooperates the shielding volute pump sealing that constitutes the volute pump formula, be sleeved on by the retardance spiral 19 of radome and periphery thereof and cooperate the retardance volute pump sealing that constitutes the volute pump formula in the pump chamber isolating ring.

The shielding volute pump sealing that above-mentioned sub-propeller 26 has the water conservancy diversion spiral 18 of the axial wing 17 of annular and periphery thereof to be sleeved on to cooperate the sub-propeller that constitutes the volute pump formula in the radome 15 and be sleeved on the retardance volute pump sealing that cooperates the sub-propeller that constitutes the volute pump formula in the axial rings 27 of sealed stator 6 by the retardance spiral 19 of radome and periphery thereof.

Above-mentioned front cover 3 connect tubulars anti-spigot 7 and on stretch into impeller 5 suction ports tongue piece 8 cooperate the anti-shield gasket that revolves of the suction port that constitutes.

Link to each other with sub-propeller 29 on above-mentioned impeller 5 and front cover 3 opposing end faces to have on impeller and the sealed stator 6 corresponding end faces and be the clearance type labyrinth seal that constitutes of at least one pair of annular groove of closing of scarf mutually vertically.

The axial motion that the pump chamber isolating ring of drain opening 12 both sides of above-mentioned impeller 5 is 10 is changeed gap 14 and is matched with drain opening, constitutes the drain opening sealing of the draining sealing running clearance that utilizes impeller.

Impeller parking sealer mechanism is arranged on the above-mentioned impeller shaft 29, there is the tube rotor 30 that is solidly set on the impeller shaft in this mechanism, be fixed with elastic component 39 on the tube rotor, also be set with and the tube rotor transmission rotor 32 that cooperates and match in the shape of a spiral, have on the rotor to be the seal ring 35 that is sealed and matched with impeller shaft and can to cooperate, can under the rotary centrifugal force effect, break away from the seal ring 36 that contacts with sealed stator again being contact seal with sealed stator 6 under the elastic component effect when static with elastic component.

High speed centrifugal pump of the present invention for single suction single-stage high speed centrifugal pump, can replace multistage centrifugal pump and realize the high service purpose, also can be used for inhaling operations such as sending the slurry material, and a pump can be used more.The commentaries on classics scooter of this centrifugal pump is compared with the centrifugal pump of other same rotational speed and impeller diameter more than 8000 rev/mins, and the lift flow can improve 25%～30%, and energy consumption can reduce by 25%～30%.This centrifugal pump use with operate identical with common high speed centrifugal pump.

Said structure of the present invention has the following advantages and effect:

1, between impeller of the present invention and front cover and rear end cover, there is water conservancy diversion screw-casing by the axial wing of impeller and periphery thereof to be contained in radome and constitutes the sealing of shielding volute pump, be contained in to cooperate in the pump chamber isolating ring by the retardance screw-casing of this radome and periphery thereof and constitute the sealing of retardance volute pump again: the match labyrinth seal of formation of impeller and the corresponding annular groove of inlaying cooperation of front cover.Between sub-propeller of the present invention and sealed stator, be contained in to cooperate in the radome by the water conservancy diversion screw-casing of the axial wing of sub-propeller and periphery thereof and constitute the sealing of shielding volute pump, be contained in to cooperate in the axial rings of sealed stator by the retardance screw-casing of this radome and periphery thereof again and constitute the sealing of retardance volute pump; In impeller sub-propeller and the corresponding ring of inlaying cooperation of the sealed stator groove formation labyrinth seal that matches that links to each other, form the hybrid sealing configuration of non-contact, under the pump row effect of labyrinth seal and volute pump, prevent the fluid in the pump case pumping chamber or supply backwashed fluid to leak outward to suction eye; Convert leak fluid to the fluidic seal fluid, sealability further is provided; When the big fluid of pumping sand content; the shielding volute pump will supply the fluid-encapsulated high-speed jet that converts to outward; in running clearance, form wedge-like annular reflection fluid-tight circle; stop pump case pumping chamber inner fluid to enter running clearance; protection impeller operation clearance is not invaded by solid impurity, keeps the water conservancy project efficient of centrifugal pump.

2, of the present invention have have anti-spigot and tongue piece thereof to match on the front cover with prominent pipe before the impeller, constitute the anti-shield gasket that revolves of suction port, can rotate the rotational flow field that produces at the suction port place with impeller by eliminate fluid, the pipe of anti-spigot blocks the front end running clearance that can make the solid impurities such as silt particle that carry in the fluid when stopping can sedimentation not enter impeller, advances to avoid to silt up, improve impeller working efficiency and operating reliability.Axial running clearance between the pump chamber isolating ring of the drain opening both sides of impeller of the present invention matches with drain opening, constitutes the drain opening sealing, utilizes the running clearance of draining sealing drain opening both sides of the drain opening of impeller.

3, adopt on the impeller shaft of the present invention the power screw construction rotor and on seal ring and seal ring structure; adopt elastic component when stopping, to promote rotor; make epitrochanterian seal ring and sealed stator be contact seal, form the impeller parking sealer, when centrifugal pump is shut down, stop escape of liquid.During the centrifugal pump operation, rotor turns round with impeller shaft, rotor acts under the tangential component and axial thrust load effect of spiral at rotary centrifugal force, overcome the elastic force of elastic component, the compound motion that rotor is done rotation and moved along spiral, disengage with sealed stator, impeller shaft is moved under the state of contactless friction, thereby can save the kinetic equation loss that causes because of contact friction; Because the friction of Sealing economizes consumption only in the moment that starts and shut down, press start-stop time its working life and calculate, so the action period of Sealing can prolong again.

Below, with embodiment and accompanying drawing thereof the present invention is further described again:

Description of drawings

Brief description of drawings:

Fig. 1 is the structural representation of a kind of sub-propeller high speed centrifugal pump of the present invention.

Fig. 2 is the impeller of Fig. 1 and the schematic representation of sub-propeller sealing configuration.

Fig. 3 is the schematic representation of the radome of Fig. 1.

Fig. 4 is the structural drawing of the elastic component of Fig. 1.

Embodiment

Embodiment 1:

A kind of high speed centrifugal pump of the present invention, shown in Fig. 1～4, by the pump housing, front cover, rear end cover, impeller, impeller shaft, formations such as sub-propeller.This centrifugal pump has suction eye sealing, the sealing of impeller drain opening, the preposition sealing of impeller, the rearmounted sealing of impeller, structures such as sub-propeller sealing, impeller parking sealer.

The above-mentioned pump housing as shown in Figure 1, is fabricated structure.The pump case 1 that the scroll casing shape of similar common centrifugal pump is arranged, the bottom of pump case have weep hole and water drain bolt 2.The front end and back end screw attachment of pump case is fitted with the front cover 3 and the rear end cover 4 that encircle plate-like respectively.Between front cover, rear end cover, pump case, be fitted with impeller 5.Between impeller, rear end cover, pump case, be fitted with sealed stator 6.The end of the intake tunnel of front cover, in be with the anti-spigot 7 of tubular shape, the flaring tongue piece 8 that the rear end of anti-spigot has one to constitute, tongue piece stretches into suitable length along axis in the pore of preceding prominent pipe 9 of impeller 5 with being clearance type, radially running clearance between tongue piece and preceding prominent pipe is shielded, and the anti-shield gasket that revolves of formation suction port.Between the front side and front cover and pump case of impeller, and respectively be fitted with the pump chamber isolating ring 10 of a ring between the rear side of impeller and sealed stator and the pump case respectively.The pumping chamber 11 of pump chamber isolating ring and pump case inner chamber looping.Two pump chamber isolating rings are symmetry with the drain opening 12 of impeller, and form current drainage seam 13 at the axial interval at drain opening place.Two pump chamber isolation wards respectively with all intermarginal formation axial operation gap 14 of impeller.

Above-mentioned impeller as shown in Figure 1, 2, is fabricated structure, is made of impeller 5 and two radomes 15 being set in impeller front and rear part periphery.Impeller 5 similar Ordinary Centrifugal Pumps uniform blade and blade wheel structure arranged.

In the preceding prominent pipe 9 of impeller front end periphery, be shaped on the annular groove 16 that two grooves, one ring is arranged that is axial ring and the axial axial wing 17 of ring to the impeller middle part.Axially the periphery of the wing is shaped on the water conservancy diversion spiral 18 of bull structure, and above-mentioned radome 15 just is sleeved on water conservancy diversion spiral periphery, constitutes the axial shielding volute pump of impeller front side, forms the sealing of shielding volute pump.Be shaped on the retardance spiral 19 of bull structure in radome 15 peripheries, constitute the axial retardance volute pump of impeller front side, form the sealing of retardance volute pump with the inner circle wall of pump chamber isolating ring 10.Water conservancy diversion slope 20 that is the top rake domatic and the gap between radome 15 angles at the impeller middle part are pump row mouth 21.

Also have in the impeller rear end with above-mentioned impeller front end symmetrical constitute the axial shielding volute pump of impeller rear side by the axial wing 17, water conservancy diversion spiral 18, radome 15, retardance spiral 19, pump chamber isolating ring 10, form the sealing of shielding volute pump; With axial retardance volute pump, form the sealing of retardance volute pump.Water conservancy diversion slope 20 and pump row mouth 21 are arranged equally.The shaft shoulder 22 that rearward extending tubular shape is arranged at central part.

Before and after impeller, between the axial wing 17 and radome 15 of side, make shielding suction port 23 volute pump, that be step ladder circular ring shape respectively.Make the end of the water conservancy diversion spiral 18 of impeller front and back side become axial half-naked step.With suction port be shaped on the choked flow step 24 that running clearance cooperates can be communicated with external water pipe respectively to water channel 25.Article two, communicate with the running clearance of impeller front end and back end respectively to water channel.

Above-mentioned sub-propeller 26, as shown in Figure 1, 2, being section is the circle ring disk that is inverted into opening П shape backward, the periphery of sub-propeller is extended back form the axial wing 17 of annular.Sub-propeller is sleeved on the shaft shoulder 22 of impeller rear end and becomes an integral body with the ear end face that screw is connected in impeller.Also there is the axial rings 27 of identical with the above-mentioned impeller front end circle of stretching out forward by the axial wing 17, water conservancy diversion spiral 18, radome 15, retardance spiral 19, sealed stator 6 to constitute the axial shielding volute pump of sub-propeller and axial retardance volute pump on the sub-propeller, forms the sealing of shielding volute pump and the sealing of retardance volute pump of sub-propeller respectively.Equally between the angle of the ear end face of impeller and above-mentioned radome 15, also form pump row mouth 21; Between the axial wing 17 and radome 15 of sub-propeller, volute pump suction port 23 is arranged also.

At the preceding prominent pipe 9 of impeller front end, annular groove 16, axially the wing 17, radome 15, pump chamber isolating ring 10 one by one between the grooved ring of corresponding matching, form zigzag running clearance respectively and in the inboard of front cover 3, constitute the labyrinth seal of impeller front side.

Axial annular groove that is formed by the axial wing 17 of the axial wing 17 of sub-propeller, radome 15, impeller, radome 15 etc. in the rear end of sub-propeller and impeller sets zoarium and sealed stator 6 are one to one axially between the grooved ring, also form zigzag running clearance, constitute the labyrinth seal structure of impeller rear side.In rear end protruding backward conical bulge loop 28 is arranged near the sealed stator 6 of the shaft shoulder 22 of impeller.

The suction port of above-mentioned impeller front side is anti-to be covered screen sealing, the sealing of impeller drain opening, the sealing of shielding volute pump, the sealing of retardance volute pump, labyrinth seal and forms the preposition sealing of hybrid-type impeller.

Above-mentioned impeller shaft 29 as shown in Figure 1, is multidiameter shaft shape, and its front end relies on spiral marking connection to connect firmly mutually with the impeller center, and the rear end links to each other with the power engine transmission, and common bearing and bearing seal are adopted in the supporting of impeller shaft, and bearing can be arranged on the rear end cover.

On above-mentioned impeller shaft 29, be set with rotor mechanism, as shown in Figure 1.The rotating center section of rotor mechanism has tube rotor 30, and it is tubular that tube rotor is ladder, and tail end has internal thread, and there is external spiral 31 at the middle part, utilizes the threads engaged on internal thread and the impeller shaft and impeller and impeller shaft are solidly fixed.The rotor 32 of rotor mechanism is two ladder cylindrical shapes, and the internal spiral of its rear portion small diameter cylinder and the external spiral of tube rotor transmission in the shape of a spiral cooperate, and rotor is ground rotatable and that move vertically is fitted on the tube rotor.Being fixed with fixed cover 33 interior week and being the support ring 34 that is sleeved on rotationally on the tube rotor of the anterior large diameter cylinder of rotor clamps the seal ring 35 of the O type guiding type of common structure between fixed cover and support ring.The supported ring of seal ring and fixed cover card jail and can not skidding off.Seal ring 35 is rotationally with tube rotor and is sealed and matched.Be set with the seal ring 36 of the O type of common structure outside on the anterior large diameter cylinder of rotor.The horn mouth that stretches out before the sealing hoop can be with the bulge loop 28 of sealed stator 6 rear ends and is sealed and matched.In seal ring 36 rear sleeve fixture 37 is housed, the sealing ring is clamped on the rotor, and locks with screw.At the bounding means 38 that tube rotor 30 rear end tail ends are fixed with step ladder circular ring shape, be fixed with the elastic component 39 of disc pressure spring type with screw in the front side of bounding means.As shown in Figure 4, have several pieces one-body molded and be the stage clip fin 40 that bends shape with respect to middle facial planes in middle part to the periphery of elastic component, the rear end of the end of fin and fixture 37 is sliding type and joins.Thereby prevent the impeller parking sealer of the power screw formula of leaking when constitute stopping.

One, the seal action in the impeller operation gap of this centrifugal pump is as follows:

1, when impeller operation, leak fluid in shielding the impeller operation gap that spiral shell is pump, retardance volute pump portion, flow to impeller suction portion, when flowing through the running clearance of 10 of impeller and pump chamber isolating rings, the reverse blowback of retardance volute pump of conductively-closed cover 15 peripheries, it is fluid-encapsulated to form retardance, and leak fluid is played retardance, deceleration, decrement.Remaining leak fluid, the choked flow stepped part of flowing through, be inhaled into water conservancy diversion spiral 18 from suction port 23, by the back blowback, through pump row mouth 21, along water conservancy diversion slope 20, be in the running clearance of inverted tubaeform at impeller and 10 of pump chamber isolating rings, form the seal ring of the centrifugal jet of annular wedge-like, leak fluid is stopped, with the pressure reduction of stopping a leak, make the leakage flow and the flow of the centrifugal jet of reverse blowback reach balance, the circulation leakage rate that realizes the impeller suction side is zero.When the working fluid in the impeller contains more impurity such as silt particle, then by supplying with water channel 25, it is fluid-encapsulated to supply with cleaning with pressure, again through suction port 23, import in the shielding volute pump, will be along in the fluid blowback water conservancy diversion spiral 18 of the leakage of the running clearance between suction port and the choked flow step, remaining leak fluid enters the running clearance of labyrinth seal.

2, flow into the leak fluid of the running clearance of labyrinth seal, under the centrifugal action of labyrinth seal annular groove inner fluid, stop it to leak to suction eye.

3, the anti-spigot on the front cover 7 seals the radially running clearance between sub-tongue piece and preceding prominent pipe owing to stretch in the preceding prominent pipe 9 of impeller.The tongue piece 8 of anti-spigot can be eliminated the field of rotary rotational flow in the same way that impeller suction portion produces under the impeller high speed rotating simultaneously.Impurity such as the twister in this outer fluid, floating debris are platform with the tongue piece, are pulverized the back by the blade ora terminalis of the impeller of high speed rotating and discharge with fluid, prevent drain opening 12 obstructions.Before anti-in addition spigot extends in the prominent pipe, the radially running clearance of prominent pipe before having shielded can stop the entrained sediment contamination sedimentation of fluid to enter radially after parking to cause in the running clearance and silt up, thereby can keep favorable starting performance.

4, when the impeller high speed rotating, a large amount of fluids from drain opening 12 is discharged pass current drainage and stitched 13 o'clock, stop fluid and let out for 14 times from the axial operation gap of current drainage seam between impeller periphery and pump chamber isolation.

Two, the seal action of the impeller shaft running clearance of this centrifugal pump is as follows:

1, stops when static when centrifugal pump, under the tension force effect of the stage clip fin 40 of elastic component 39, fixture 37 so promote rotor 32 and on seal ring 36 and seal ring 35, rotatablely move and be forward that the impeller direction moves along the external spiral on the tube rotor 30 31, make the horn mouth of epitrochanterian seal ring 36 front ends, left-hand thread is static contact seal on the periphery of the bulge loop 28 of sealed stator 6.When promptly stopping with seal ring 36 and seal ring 35 sealing impellers by running clearance.

2, when impeller shaft 29 high speed rotating, rotor 32 is with the impeller shaft high speed rotating, obtain higher centrifugal force, tangential and the axial thrust load promotion rotor of centrifugal force rotatablely moves and moves to bounding means 38 backward along the external spiral on the tube rotor 30 31, overcome the tension force of the stage clip fin of elastic component 39 simultaneously, the horn mouth that end is arranged of epitrochanterian seal ring 36 and the bulge loop 28 of sealed stator disengage.This moment is because the shielding volute pump of impeller rear side seals, the retardance volute pump seals and the shielding volute pump sealing of sub-propeller, retardance volute pump seal, labyrinth seal seals and can not leak from the running clearance of impeller shaft the running clearance of impeller rear side.

Claims

1, high speed centrifugal pump, comprise the pump case (1) that connects front cover (3) and rear end cover (4) formation scroll casing shape, the sub-propeller (26) that impeller in the pump case (5) and impeller rear end are connected, the sealed stator (6) that links to each other with pump case between sub-propeller and the rear end cover, respectively with pump case in the front side and the pump chamber isolating ring (10) that joins of rear side in week, the impeller shaft that links to each other with impeller (29), it is characterized in that having water conservancy diversion spiral (18) by the axial wing (17) of the annular of impeller and periphery thereof to be sleeved in the radome (15) of annular at the front side of impeller and rear side cooperates the shielding volute pump sealing that constitutes the volute pump formula, be sleeved on by the retardance spiral (19) of radome and periphery thereof and cooperate the retardance volute pump that constitutes the volute pump formula to seal in the pump chamber isolating ring.

2, high speed centrifugal pump according to claim 1, it is characterized in that shielding volute pump sealing that said sub-propeller (26) has the axial wing (17) of annular and the water conservancy diversion spiral (18) of periphery thereof to be sleeved on to cooperate the sub-propeller that constitutes the volute pump formula in the radome (15) and be sleeved on the retardance volute pump sealing that cooperates the sub-propeller that constitutes the volute pump formula in the axial rings (27) of sealed stator (6) by the retardance spiral (19) of radome and periphery thereof.

3, high speed centrifugal pump according to claim 1, it is characterized in that said front cover (3) connect tubular anti-spigot (7) and on stretch into impeller (5) suction port tongue piece (8) cooperate the anti-shield gasket that revolves of the suction port that constitutes.

4, high speed centrifugal pump according to claim 1 has on it is characterized in that on said impeller (5) and front cover (3) opposing end faces linking to each other with sub-propeller (29) impeller and the corresponding end face of sealed stator (6) to be the clearance type labyrinth seal that constitutes of at least one pair of annular groove of closing of scarf mutually vertically.

5, according to claim 1,2,3 or 4 described high speed centrifugal pumps, it is characterized in that axial motion between the pump chamber isolating ring (10) of drain opening (12) both sides of said impeller (5) changes gap (14) and match with drain opening, the drain opening that constitutes the draining sealing running clearance that utilizes impeller seals.

6, according to claim 1,2,3 or 4 described high speed centrifugal pumps, it is characterized in that hour wheel parking sealer mechanism is arranged on the said impeller shaft (29), there is the tube rotor (30) that is solidly set on the impeller shaft in this mechanism, be fixed with elastic component (39) on the tube rotor, also be set with and the tube rotor transmission rotor (32) that cooperates and match in the shape of a spiral, have on the rotor with impeller shaft to be the seal ring (35) that is sealed and matched with elastic component, can be contact seal with sealed stator (10) under the elastic component effect when static cooperates, can under the rotary centrifugal force effect, break away from the seal ring (36) that contacts with sealed stator again.

7, high speed centrifugal pump according to claim 5, it is characterized in that impeller parking sealer mechanism is arranged on the said impeller shaft (29), there is the tube rotor (30) that is solidly set on the impeller shaft in this mechanism, be fixed with elastic component (39) on the tube rotor, also be set with and the tube rotor transmission rotor (32) that cooperates and match in the shape of a spiral, have on the rotor with impeller shaft to be the seal ring (35) that is sealed and matched with elastic component, can be contact seal with sealed stator (6) under the elastic component effect when static cooperates, can under the rotary centrifugal force effect, break away from the seal ring (36) that contacts with sealed stator again.