CN2403927Y - Non-shaft seal magnetic suspension pump - Google Patents

Abstract

The utility model relates to a non-shaft seal magnetic suspension pump which belongs to the technical field of non-shaft seal pumps. A shaft sleeve balance valve automatically balances rotor axial force and drives a rotor to be in an axial liquid suspension mode, and a radial magnetic suspension bearing automatically balances rotor radial force and drives the rotor in a radial magnetic suspension mode. A shielding motor stator and a radial magnetic suspension bearing stator are cooled by the evaporation, self-circulation and immersion of freon R113, and a cavity of a motor rotor is automatically supplied with gas which is compatible with liquid conveyed by a pump. The utility model has the advantages of simpler structure, and high efficiency without leakage, and can convey high-temperature acid and alkali liquid which contains solid particles, which comprises magnetized solid particles. The bearing has no contact frictional wear, and has long service life and high automatization.

Description

Magnetic suspension pump without shaft seal

The utility model magnetic suspension pump without shaft seal belongs to the glandlesspump technical field, is the new and high technology new pump product mechanical, electric, that electronics combines.

In oil, chemical industry, light industry, electric power, navigation, space flight, in the industry such as sanitation project, the glandlesspump of seeking development is more and more approaching.Because packing shaft seal, mechanical shaft seal, dynamic shaft seal realize that pump does not have very difficulty of leakage work.The run, drip, leak of pump are masty difficult problems.It directly influences the reliability and the life-span of pump work, causes environmental pollution, worsens operating conditions, threatens safety in production, and glandlesspump has become important developing direction.

Traditional glandlesspump (claiming no-leakage pump again) mainly contains two kinds of canned motorpump and magnetic drive pumps.The former shields rotor and pump in same housing; The latter shields magnet rotor and pump in same housing, and magnet rotor is driven by the magnetic cylinder that is arranged on conventional motor side.But the rotor of canned motorpump soaks and is rotated in the liquid of pump conveying, and liquid viscosity is big, and frictional loss is big, the more conventional motor-drive pump of its unit efficiency low 10～15%; And except that carrying the good clean liquid of lubricity, bearing is quick-wearing very, has a strong impact on the pump work life-span; Moreover when carrying high-temp liquid, motor need be taked cooling method.And magnetic drive pump, because magnetic drives, the liquid that pump is carried need carry out magnetic and filter; Because magnetic drives, its efficient also will descend 10～15%, and magnet rotor still soaks and is rotated in the liquid of pump conveying, and liquid viscosity is big, and frictional loss is big, the more conventional motor-drive pump of its unit efficiency low 20～30%; Also except that carrying the good clean liquid of lubricity, bearing is quick-wearing very, has a strong impact on the pump work life-span; But when the high-temp liquid of carrying below 450 ℃, magnetic drive device can not cool off.Low in view of the unit efficiency of canned motorpump and magnetic drive pump, bearing is easy to wear, magnetic drive pump need carry out when conveying contains the liquid that magnetizes solid particle that magnetic filters, canned motorpump motor when carrying high-temp liquid need cool off, therefore in applying, be very limited.

In the world, for solving shield pump bearing problem easy to wear, the canned motorpump of application magnetic suspension bearing (claiming magnetic bearing again) has appearred.Ward off as, in September, 1989, " World Pumps " magazine was reported " canned motorpump with design, manufacturing and the test of magnetic force axle " paper of people such as Paul E.Allaire.This paper has been narrated a horizontal canned motorpump and has been adopted magnetic suspension bearing to replace graphite bearing.This pump its rotor when work is had two radial magnetic bearings of 0.38mm radial clearance respectively and is had a thrust magnetic suspension bearing suspension supporting of 0.5mm axial clearance, the direct contact friction wearing and tearing of axle journal and bearing shell have been avoided, to prolong the pump work life-span.But, use two radial magnetic bearings and a thrust magnetic suspension bearing, its complex structure; And because the radial clearance of radial magnetic bearing is 0.38mm, and the radial clearance of the dull and stereotyped seal ring of pump impeller is generally 0.1～0.15mm, then the gap of the dull and stereotyped seal ring of pump impeller must be greater than 0.38mm, thereby has strengthened the leakage rate of the dull and stereotyped seal ring of impeller, causes pump volumetric efficiency to descend; Moreover the liquid cooling that magnetic suspension bearing and motor are carried by pump is so be unsuitable for surpassing the pump of normal temperature work.Therefore, apply difficulty.

Traditional multistage centrifugal pump Balance disc, axial force that can the complete equilibrium pump also makes pump rotor near being in axial liquid state of suspension, thereby the type pump does not use thrust-bearing.But, point out in " the modern pump technical manual " write as Guan Xingfan (September nineteen ninety-five, the Yuhang Publishing House published): Balance disc leakage rate big (rated flow 3～20%), the bigger volumetric efficiency that reduces pump; Balance disc gap little (generally in 0.1～0.2mm scope), Balance disc is easy to wear; The Balance disc size is big, and disc friction is big, the bigger mechanical efficiency that reduces pump.So Balance disc seriously descends pump efficiency and weares and teares greatly, uses during the general axial force that only autobalance is big in multistage centrifugal pump.

(special number of the edition: 87206747), fill with pressurized air for the motor of submersible pump, motor internal does not contact with water China's model utility monograph " pressurized seal submersible pump " on the one hand, guarantees the insulation of motor; Rotor rotates in the less air of viscosity on the other hand, causes the frictional loss of rotor to reduce, thereby improves electric efficiency.But, therefore limited using scope owing to only fill the compression air to motor for submerged pump.

At above deficiency, the utility model provides a kind of magnetic suspension pump without shaft seal, axle sleeve balance valve automatic balancing rotor axial force also suspends rotor axial liquid, radial magnetic bearing automatic balancing rotor radial force also makes the rotor radial magnetic suspension, shield electric machine stator and magnetic suspension bearing stator adopt freon R113 evaporation self-loopa to soak cooling, replenish the liquid compatible gases of carrying with pump in the shielding motor rotor cavity automatically.This type of pump is relatively simple for structure, and the efficient height do not have to leak, and can carry high temperature, contain solid particle and comprise and contain the soda acid liquid that magnetizes solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

The utility model is described in further detail with formula below in conjunction with accompanying drawing and concrete enforcement.

Fig. 1 is the utility model magnetic suspension pump without shaft seal schematic representation.

Fig. 2 is to change on Fig. 1 basis from cold shield magnetic suspension pump schematic representation.

Fig. 3 is to change into magnetic force magnetic suspension pump schematic representation on Fig. 1 basis.

Fig. 4 is to change into self cooling magnetic force magnetic suspension pump schematic representation on Fig. 1 basis.

Fig. 5 is to change into the multistage magnetic suspension pump schematic representation of shielding on Fig. 1 basis.

Fig. 6 is to change on Fig. 1 basis from the multistage magnetic suspension pump schematic representation of cold shield.

Fig. 7 is the radial magnetic bearing automatic control system schematic representation among Fig. 1～Fig. 6.

Fig. 8 is the automatic air supply device schematic representation among Fig. 1, Fig. 3, Fig. 5.

Fig. 1, the magnetic suspension pump without shaft seal schematic representation is described to be vertical single stage high temperature shielding magnetic suspension pump.It is made up of shield electric machine, single-stage pump, radial magnetic bearing etc., and rotor and pump shielding are in same housing.Shield electric machine is an asynchronous motor.Motor stator 20 shieldings, rotor 14 are contained in pump impeller 30 strings such as grade forms magnetic suspension pump rotor (title rotor) on the axle 16.The import of the liquid that is transferred from the pump housing 2 sucks, and the outlet after pump impeller 30 obtains energy from the pump housing 2 is discharged.

For adapting to pump, on rear pump cover 27, cooling chamber is set at the hot operation below 450 ℃.Cooling water is taken over from water inlet and is chewed 5 and enter cooling chamber, takes over from water outlet and chews 28 and discharge, below the liquid cooling to 80 that the floating ring 4 of float ring seal behind the impeller is leaked out ℃.

It is to realize like this that rotor axial liquid suspends.Determine that by calculating floating ring 4 diameters of the back float ring seal of pump impeller 30 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 6, reflow pipe 3.Have 2～4 grooves on the balance sleeve 6, balance sleeve 6 is formed axle sleeve balance valve with the floating ring 29 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 30 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.The advantage of this structure is: 1, and with aforesaid employing thrust magnetic suspension bearing the rotor axial magnetic suspension is compared, utilized the energy of pump self liquid, adopt simple axle sleeve balance valve to realize that rotor axial liquid suspends; 2, float ring seal (is seen " modern pump technical manual " that Guan Xingfan writes, Yuhang Publishing House's publication in September nineteen ninety-five) floating ring is axle (or axle sleeve) self-aligning relatively, floating ring and axle (or axle sleeve) are not contacted with each other, wearing and tearing, long working life, can keep very little radial direction gap on the other hand, generally in 0.025～0.05mm scope, the liquid that the floating ring 4 of float ring seal leaks out behind pump impeller 30 is few like this, pump volumetric efficiency improves, avoided aforementioned and will strengthen the dull and stereotyped close czermak space of impeller because of radial magnetic bearing needs the 0.38mm radial clearance, thereby strengthened the leakage rate of the dull and stereotyped seal ring of impeller, the shortcoming that causes pump volumetric efficiency to descend; 3, axle sleeve balance valve automatic balancing rotor axial force is to move by the rotor automatic axial to adjust the slotting length (being the valve opening size) that balance sleeve stretches out and realize, and the length that the balance sleeve fluting stretches out can be determined by the fluting number and the groove width of balance sleeve, avoided aforesaid multistage centrifugal pump Balance disc gap little (generally in 0.1～0.2mm scope), the shortcoming that Balance disc is easy to wear: 4, the balance sleeve diameter is little, disc friction is little, avoided aforesaid multistage centrifugal pump Balance disc size big, disc friction is big, the bigger shortcoming that has reduced the mechanical efficiency of pump.For guaranteeing the axial limiting of pump, on rotor, be provided with axial limiting baffle ring 7 at startup and docking process rotor.Below relating to rotor axial liquid suspended phase content together no longer is described in detail.

The rotor radial magnetic suspension is to realize like this.Two radial magnetic bearings are set on the magnetic suspension pump rotor.Radial magnetic bearing is made up of bearing support 23, magnetic suspension bearing stator 11, magnetic suspension bearing magnet rotor 24 and bearing stator wiring terminal 9 etc.The shielding of radial magnetic bearing stator, two gap probes 12 are measured the bearing radial gap value, two radial clearance value signal size of current and distributions in the change bearing stator after the automatic control system (not shown) is handled, thereby change the radial force size and the direction of bearing magnet rotor, radial force with automatic balancing rotor, and make rotor radial magnetic suspension (see " mechanical design handbook " the 4th volume of Xu Hao chief editor, China Machine Press publishes in September, 1991).

It is to realize like this that cooling is soaked in shield electric machine stator and radial magnetic bearing stator evaporation self-loopa.Shield electric machine is an asynchronous motor, and it is made up of motor housing 13, motor stator 20, rotor 14 and motor stator wiring terminal 18 etc.Freon R113 is that 47.6 ℃ of standard vaporization temperature are (under 1atm, when temperature is lower than 47.6 ℃ liquid, when temperature surpasses 47.6 ℃, become gas) refrigerant, and it is non-conductive, therefore can adopt freon R113 that shield electric machine stator and radial magnetic bearing stator are evaporated self-loopa immersion cooling (title infiltration normal temperature self-loopa cooling again, see " heat exchange in the motor " that write in Wei Yong field etc., China Machine Press publishes in August, 1998).Refrigerant also can adopt the close substitute of other performances.The motor stator shielding, charging point 21 carries out freon R113 filling (vacuumizing before the filling), level meter 19 is in order to observe freon liquid level height, plug screw 17 advances air when being used to discharge freon, freon R113 liquid absorbs the heat of motor stator and rotor generation, part becomes gas and floats on motor stator top that (its evaporating temperature that becomes gas is relevant with operating pressure, ward off as, when 80 ℃ of evaporating temperatures, its corresponding operating pressure is 2.7atm), gas by be arranged on the motor housing 13 cooling tube at ambient temperature heat release become liquid, form the self-loopa of shield electric machine stator closed evaporating and soak cooling, can keep the shield electric machine temperature below 80 ℃.The freon R113 steam on shield electric machine stator top (is the good thermal insulation of assurance by steam inlet pipe 15, heat insulation layer such as coated asbestos outside pipe) enters on a small quantity in the radial magnetic bearing stator, absorb heat and further expansion that bearing stator and bearing magnet rotor produce, through bearing cooling tube 22 at ambient temperature heat release become liquid, be back to down in the radial magnetic bearing stator 11, the freon R113 liquid that is back to down the radial magnetic bearing stator absorbs that the floating ring 4 of float ring seal leaks out behind heat that bearing stator and bearing magnet rotor produce and the impeller again is cooled to liquid below 80 ℃ through the heat of gas conduction, part becomes gas, be back to shield electric machine stator bottom through vapour-liquid reflow pipe 10 again, go up like this, following two radial magnetic bearing stators also form the closed evaporating self-loopa and soak cooling, can keep two radial magnetic bearing temperature below 80 ℃.Below relating to the shield electric machine stator no longer is described in detail with the identical content of radial magnetic bearing stator evaporation self-loopa immersion cooling.

Automatic air supply device is to covering in the rotor cavity tonifying Qi automatically, is on the one hand to make shielding motor rotor comprise that the magnetic suspension bearing magnet rotor soaks and is rotated in the less gas of viscosity, to reduce frictional loss, improves shield electric machine efficient; Be that the liquid that the floating ring to float ring seal behind the pump impeller leaks out carries out sealing gland on the other hand, the liquid that pump is carried does not contact with shielding motor rotor with the magnetic suspension bearing magnet rotor, and pump can be carried and contain the liquid that magnetizes solid particle like this.Need to prove that gas is generally very little to the solubility of liquid, so need additional gas flow generally seldom, but what replenished must be the liquid compatible gases of carrying with pump, has solved the deficiency that aforementioned " pressurized seal submersible pump " fills the compression air only for the motor of submersible pump.When pump work, when liquid level surpassed last liquid level sensor 25, its signal via controller (not shown) was handled, and takes over by tonifying Qi and chews 8 tonifying Qi; When liquid level was lower than liquid level sensor 26, its signal via controller was handled, and stops tonifying Qi.Below relating to the identical content of automatic tonifying Qi no longer is described in detail.

This type of pump is relatively simple for structure, and efficient height (close with conventional motor-drive pump unit efficiency) do not have to leak, and can carry high temperature, contain solid particle and comprise and contain the soda acid liquid that magnetizes solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

Fig. 2, described from cold shield magnetic suspension pump schematic representation is that vertical single stage is from the cold shield magnetic suspension pump.It is made up of shield electric machine, single-stage pump, radial magnetic bearing etc., and the shielding of rotor and pump is in same housing, and shield electric machine and magnetic suspension bearing utilize temperature that pump carries to cool off less than 80 ℃ liquid.Shield electric machine is an asynchronous motor, is made up of shield electric machine stator 14, rotor 10, motor housing 9, motor stator wiring terminal 13 etc.Rotor 10 is contained in pump impeller 19 strings such as grade forms magnetic suspension pump rotor (title rotor) on the axle 11.The import of the liquid that is transferred from the pump housing 2 sucks, and the outlet after pump impeller 19 obtains energy from the pump housing 2 is discharged.

Rotor axial liquid suspends.Determine that by calculating floating ring 4 diameters of the back float ring seal of pump impeller 19 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 17, axial limiting baffle ring 6, bearing magnet rotor 15, rotor 10, reflow pipe 3.Have 2～4 grooves on the balance sleeve 17, balance sleeve 17 is formed axle sleeve balance valve with the floating ring 18 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 19 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.The axial limiting baffle ring 6 that is arranged on the rear pump cover 16 is starting and docking process rotor axial limiting in order to guarantee pump.

The rotor radial magnetic suspension.Two radial magnetic bearings are set on the magnetic suspension pump rotor.Radial magnetic bearing is made up of bearing support 12, magnetic suspension bearing stator 7, magnetic suspension bearing magnet rotor 15 and bearing stator wiring terminal 5 etc.The shielding of magnetic suspension bearing stator, two gap probes 8 are measured the bearing radial gap value, two radial clearance value signal size of current and distributions in the change stator after the automatic control system (not shown) is handled, thereby change the radial force size and the direction of magnet rotor, radial force with automatic balancing rotor, and making the rotor radial magnetic suspension, pump can be carried solids-laden fluid like this.

The floating ring 4 of float ring seal leaks out the liquid that is back to pump inlet through balance sleeve 17, axial limiting baffle ring 6, bearing magnet rotor 15, rotor 10, reflow pipe 3 and simultaneously shield electric machine and magnetic suspension pump bearing is cooled off voluntarily behind the impeller.For son overcomes bigger flow resistance, determine the diameter of the floating ring 4 of float ring seal behind the big a little again impeller by calculating.Because the liquid that uses pump to carry cools off voluntarily to shield electric machine and magnetic suspension bearing, so this type of pump can not carry high temperature, contain the liquid that magnetizes solid particle.

This type of pump is simple in structure, and efficient lower (lower by 10～15% than conventional motor-drive pump unit efficiency) does not have and leaks, and can carry normal temperature, contain the soda acid liquid of solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

As required, this type of pump can be changed into horizontal type structure.

If the pump delivery temperature greater than 80 ℃ liquid, can add the water cooling chamber on rear pump cover 16, below the liquid cooling to 80 that the floating ring 4 of float ring seal behind the impeller is leaked out ℃, with cooling shield electric machine and magnetic suspension bearing.

Fig. 3, magnetic force magnetic suspension pump schematic representation is described to be vertical single stage high temperature magnetically driven magnetic suspension type pump.It is made up of conventional asynchronous motor, magnetic drive device, single-stage pump and radial magnetic bearing etc., and the magnet rotor of magnetic drive device and pump shielding are in same housing.Conventional asynchronous motor 18 axle heads are provided with magnetic cylinder 16.Magnetic drive device is made up of magnet rotor 15, magnetic cylinder 16, shielding can 17 and connecting sleeve 19 etc.Magnet rotor 15 is contained in pump impeller 31 strings such as grade forms magnetic suspension pump rotor (title rotor) on the axle 13.The import of the liquid that is transferred from the pump housing 2 sucks, and the outlet after pump impeller 31 obtains energy from the pump housing 2 is discharged.

For adapting to pump, on rear pump cover 28, cooling chamber is set at the hot operation below 450 ℃.Cooling water is taken over from water inlet and is chewed 5 and enter cooling chamber, takes over from water outlet and chews 29 and discharge, below the liquid cooling to 80 that the floating ring 4 of float ring seal behind the impeller is leaked out ℃.

Rotor axial liquid suspends.Determine that by calculating floating ring 4 diameters of the back float ring seal of pump impeller 31 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 6, reflow pipe 3.Have 2～4 grooves on the balance sleeve 6, balance sleeve 6 is formed axle sleeve balance valve with the floating ring 30 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 31 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.For guaranteeing the axial limiting of pump, on rotor, be provided with axial limiting baffle ring 7 at startup and docking process rotor.

The rotor radial magnetic suspension.Upper and lower two radial magnetic bearings are set on the magnetic suspension pump rotor, and middle cover 23 guarantees distance necessary between two bearings.Radial magnetic bearing is made up of bearing support 20, magnetic suspension bearing stator 11, magnetic suspension bearing magnet rotor 25 and bearing stator wiring terminal 9 etc.Two gap probes 12 are measured the bearing radial gap value, two radial clearance value signal size of current and distributions in the change stator after the automatic control system (not shown) is handled, thereby change the radial force size and the direction of magnet rotor, with the radial force of automatic balancing rotor, and make the rotor radial magnetic suspension.The shielding of radial magnetic bearing stator, adopt freon R113 evaporation self-loopa to soak cooling, charging point 24 carries out freon R113 filling (vacuumizing before the filling), plug screw 14 is used for advancing air when discharging freon, level meter 21 is in order to observe the freon liquid level, down radially the freon R113 liquid in the magnetic suspension stator absorb that the floating ring 4 of float ring seal leaks out behind heat that bearing stator and bearing magnet rotor produce and the impeller be cooled to liquid below 80 ℃ through the heat of gas conduction, part becomes gas, gas (is the good thermal insulation of assurance through steam inlet pipe 10, heat insulation layer such as coated asbestos outside pipe) enters in the radial magnetic bearing stator, freon R113 gas absorbs the heat and the further expansion of the heat and the magnetic drive device of bearing stator and the generation of bearing magnet rotor again, through bearing cooling tube 22 at ambient temperature heat release become liquid, return down in the radial magnetic bearing stator, form the closed evaporating self-loopa and soak cooling, can keep, following two radial magnetic bearing temperature are below 80 ℃.

Automatic air supply device is to replenishing the liquid compatible gases of carrying with pump automatically in the magnetic drive device magnet rotor cavity, on the one hand be to make magnet rotor comprise that the magnetic suspension bearing magnet rotor soaks and is rotated in the less gas of viscosity, to reduce frictional loss, improve the efficient of magnetic drive device; Be that the liquid that the floating ring to float ring seal behind the pump impeller leaks out carries out sealing gland on the other hand, the liquid that pump is carried does not contact with the magnetic drive device magnet rotor with the magnetic suspension bearing magnet rotor, can carry like this to contain the liquid that magnetizes solid particle.。When pump work, when liquid level surpassed last liquid level sensor 26, its signal via controller (not shown) was handled, and takes over by tonifying Qi and chews 8 tonifying Qi; When liquid level was lower than liquid level sensor 27, its signal controller was handled, and stops tonifying Qi.

This type of pump is relatively simple for structure, and efficient lower (than conventional motor-drive pump unit efficiency low 10～15%) does not have and leaks, can carry high temperature, contain solid particle and comprise and contain the soda acid liquid that magnetizes solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

Fig. 4, self cooling magnetic force magnetic suspension pump schematic representation is described to be the self cooling magnetically driven magnetic suspension type pump of vertical single stage.It is made up of conventional asynchronous motor, magnetic drive device, single-stage pump and radial magnetic bearing etc., and the shielding of magnet rotor and pump is in same housing, and shield electric machine and magnetic suspension bearing utilize temperature that pump carries to cool off less than 80 ℃ liquid.Conventional asynchronous motor 13 axle heads are provided with magnetic cylinder 11.Magnetic drive device is made up of magnet rotor 10, magnetic cylinder 11, shielding can 12 and connecting sleeve 14 etc.Magnet rotor 10 is contained in pump impeller 21 strings such as grade forms magnetic suspension pump rotor (title rotor) on the axle 9.The import of the liquid that is transferred from the pump housing 2 sucks, and the outlet after pump impeller 21 obtains energy from the pump housing 2 is discharged.

Rotor axial liquid suspends.Determine that by calculating floating ring 4 diameters of the back float ring seal of pump impeller 21 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 19, axial limiting baffle ring 6, bearing magnet rotor 17, middle cover 16, reflow pipe 3.Have 2～4 grooves on the balance sleeve 19, balance sleeve 19 is formed axle sleeve balance valve with the floating ring 20 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 21 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.The axial limiting baffle ring 6 that is arranged on the rear pump cover 18 is starting and docking process rotor axial limiting in order to guarantee pump.

The rotor radial magnetic suspension.Two radial magnetic bearings are set on the magnetic suspension pump rotor.Radial magnetic bearing is made up of bearing support 15, magnetic suspension bearing stator 7, magnetic suspension bearing magnet rotor 17 and bearing stator wiring terminal 5 etc.The shielding of magnetic suspension bearing stator, two gap probes 8 are measured the bearing radial gap value, two radial clearance value signal size of current and distributions in the change stator after the automatic control system (not shown) is handled, thereby change the radial force size and the direction of magnet rotor, radial force with automatic balancing rotor, and making the rotor radial magnetic suspension, pump can be carried solids-laden fluid like this.

The floating ring 4 of float ring seal leaks out the liquid that is back to pump inlet through balance sleeve 19, axial limiting baffle ring 6, bearing magnet rotor 17, middle cover 16, reflow pipe 3 and simultaneously shield electric machine and magnetic suspension bearing is played cooling action voluntarily behind the impeller.In order to overcome bigger flow resistance, determine floating ring 4 diameters of float ring seal behind the big a little again impeller by calculating.Because the liquid that uses pump to carry cools off voluntarily to shield electric machine and magnetic suspension bearing, so this type of pump can not carry high temperature, contain the liquid that magnetizes solid particle.

This type of pump is simple in structure, and efficient very low (lower by 20～30% than conventional motor-drive pump unit efficiency) does not have and leaks, and can carry normal temperature, contain the soda acid liquid of solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

As required, this type of pump can be changed into horizontal type structure.

If the pump delivery temperature greater than 80 ℃ liquid, can add the water cooling chamber on rear pump cover 18, below the liquid cooling to 80 that the floating ring 4 of float ring seal behind the impeller is leaked out ℃, with cooling shield electric machine and magnetic suspension bearing.

Fig. 5, shielding multistage magnetic suspension pump schematic representation described is vertical multi-stage high temperature shielding magnetic suspension pump.It is made up of shield electric machine, 3 radial magnetic bearings of multistage pump and upper, middle and lower etc., and rotor and multistage pump shielding are in same housing.Shield electric machine is an asynchronous motor.Pump inlet section 5, intermediate section 34, outlet section 8 usefulness tie-bars 35 connect.Motor stator 24 shieldings, rotor 18 are contained in multistage pump impeller 37 strings such as grade forms magnetic suspension pump rotor (title rotor) on the axle 19.Floating ring 7 is the floating ring of inter-stage float ring seal, in order to adapt to the needs of the big radial clearance of radial magnetic bearing, reduces inter-stage spillage, improves pump volumetric efficiency.The import of the liquid that is transferred on the pump inlet section 5 sucks, and the outlet after a plurality of pump impeller obtain energy on the pump discharge section 8 is discharged.

For adapting to pump, on pump discharge section 8, cooling chamber is set at the hot operation below 450 ℃.Cooling water is taken over from water inlet and is chewed 9 and enter cooling chamber, and take over from water outlet and chew 31 and discharge, and below the liquid cooling to 80 that the floating ring 33 of float ring seal behind the pump impeller is leaked out ℃.On pump inlet section 5 cooling chamber is set, cooling water is chewed 4 from the water inlet adapter and is entered cooling chamber, takes over from water outlet and chews 36 discharges, and following radial magnetic bearing is played heat-blocking action.

Rotor axial liquid suspends.By calculate determining, floating ring 33 diameters of the back float ring seal of pump impeller than pump first stage impeller before floating ring 6 diameters of float ring seal big, rotor axial power in a basic balance.The liquid that the floating ring 33 of float ring seal leaks out behind the pump impeller is back to pump inlet through balance sleeve 32, reflow pipe 2, base 1, stirrer 3, following radial magnetic bearing.Stirrer 3 can make solid particle not be deposited in the base 1.Have 2～4 grooves on the balance sleeve 32, balance sleeve 32 is formed axle sleeve balance valve with the floating ring 10 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.For guaranteeing the axial limiting of pump, on rotor, be provided with axial limiting baffle ring 11 at startup and docking process rotor.

The rotor radial magnetic suspension.The problem that 3 radial magnetic bearings in upper, middle and lower can solve the long axle insufficient rigidity that is produced of axle of the multistage magnetic suspension pump of shielding is set on the magnetic suspension pump rotor.Radial magnetic bearing is made up of bearing support 27, magnetic suspension bearing stator 15, magnetic suspension bearing magnet rotor 28 and bearing stator wiring terminal 13 etc.The shielding of radial magnetic bearing stator, two gap probes 16 are measured the bearing radial gap value, two radial clearance value signal size of current and distributions in the change stator after the automatic control system (not shown) is handled, thereby change the radial force size and the direction of magnet rotor, with the radial force of automatic balancing rotor, and make the rotor radial magnetic suspension.The liquid of temperature below 80 ℃ that is cooled to that reflow pipe 2 refluxes cools off following radial magnetic bearing.Because radial magnetic bearing soaks and is rotated in the liquid of pump conveying down, contains the liquid that magnetizes solid particle so this type can not be carried.

The shield electric machine stator and last, in two radial magnetic bearing stators evaporation self-loopas soak cooling.Shield electric machine is an asynchronous motor, is made up of motor housing 17, motor stator 24, rotor 18 and motor stator wiring terminal 22 etc.The motor stator shielding, adopt freon R113 that the shield electric machine stator is evaporated self-loopa and soak cooling, charging point 25 carries out freon R113 filling (vacuumizing before the filling), plug screw 21 advances air when being used to discharge freon, level meter 23 is in order to observe freon liquid level height, freon R113 liquid absorbs the heat of motor stator and rotor generation, part becomes gas and floats on motor stator top, gas by be arranged on the motor housing 17 cooling tube at ambient temperature heat release become liquid, form the self-loopa of shield electric machine stator closed evaporating and soak cooling, can keep the shield electric machine temperature below 80 ℃.The freon R113 steam on shield electric machine stator top (is the good thermal insulation of assurance by steam inlet pipe 20, heat insulation layer such as coated asbestos outside pipe) enters on a small quantity in the radial magnetic bearing stator, through bearing cooling tube 26 at ambient temperature heat release become liquid, be back in the radial magnetic bearing stator 15, the freon R113 liquid that is back to the radial magnetic bearing stator absorbs that the floating ring 33 of float ring seal leaks out behind heat that bearing stator and bearing magnet rotor produce and the impeller again is cooled to liquid below 80 ℃ through the heat of gas conduction, part becomes gas, be back to shield electric machine stator bottom through vapour-liquid reflow pipe 14 again, go up like this, in two radial magnetic bearing stators also form the closed evaporating self-loopa and soak cooling.

Automatic air supply device replenishes the liquid compatible gases of carrying with pump automatically to covering in the rotor cavity, be make that shielding motor rotor comprises, middle radial magnetic bearing magnet rotor soaks and be rotated in the less gas of viscosity, to reduce frictional loss, improve shield electric machine efficient.When pump work, when liquid level surpassed last liquid level sensor 29, its signal via controller (not shown) was handled, and takes over by tonifying Qi and chews 12 tonifying Qi; When liquid level was lower than liquid level sensor 30, its signal via controller was handled, and stops tonifying Qi.

This type of pump structure more complicated, efficient height (close) with the electronic multistage pump unit efficiency of routine, the lift height do not have to leak, and can carry high temperature, contain the soda acid liquid of solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

Fig. 6, described from the multistage magnetic suspension pump schematic representation of cold shield is vertical self cooling multistage shielding magnetic suspension pump.It is made up of shield electric machine, 3 radial magnetic bearings of multistage pump and upper, middle and lower etc., and the shielding of rotor and pump is in same housing, and shield electric machine and magnetic suspension bearing utilize temperature that pump carries to cool off less than 80 ℃ liquid.Shield electric machine is an asynchronous motor, is made up of motor stator 18, rotor 14, motor housing 13, motor stator wiring terminal 17 etc.Pump inlet section 4, intermediate section 22, outlet section 7 usefulness tie-bars 23 connect.Rotor 14 is contained in multistage pump impeller 24 strings such as grade forms magnetic suspension pump rotor (title rotor) on the axle 15.Floating ring 6 is the floating ring of inter-stage float ring seal, in order to adapt to the needs of the big radial clearance of radial magnetic bearing, reduces inter-stage spillage, improves pump volumetric efficiency.The import of the liquid that is transferred from the inducer 4 sucks, and the outlet after a plurality of pump impeller obtain energy from the outlet section 7 is discharged.

Rotor axial liquid suspends.Determine that by calculating floating ring 21 diameters of the back float ring seal of pump impeller are bigger than floating ring 5 diameters of the preceding float ring seal of pump first stage impeller, rotor axial power in a basic balance.The liquid that the floating ring 21 of the back float ring seal of pump impeller leaks out is back to pump inlet through balance sleeve 20, axial limiting baffle ring 10, outlet section 7, bearing magnet rotor 19, rotor 14, reflow pipe 2, base 1, stirrer 3, following radial magnetic bearing.Stirrer 3 can make solid particle not be deposited in the base 1.Have 2～4 grooves on the balance sleeve 20, balance sleeve 20 is formed axle sleeve balance valve with the floating ring 8 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.The axial limiting baffle ring 10 that is arranged on the outlet section 7 is starting and docking process rotor axial limiting in order to guarantee pump.

The rotor radial magnetic suspension.The problem that 3 radial magnetic bearings in upper, middle and lower can solve the long axle insufficient rigidity that is produced of axle of the multistage magnetic suspension pump of shielding is set on the magnetic suspension pump rotor.Radial magnetic bearing is made up of bearing support 16, magnetic suspension bearing stator 11, magnetic suspension bearing magnet rotor 19 and bearing stator wiring terminal 9 etc.The shielding of radial magnetic bearing stator, two gap probes 12 are measured the bearing radial gap value, two radial clearance value signal size of current and distributions in the change stator after the automatic control system (not shown) is handled, thereby change the radial force size and the direction of magnet rotor, radial force with automatic balancing rotor, and making the rotor radial magnetic suspension, pump can be carried solids-laden fluid like this.

The floating ring 21 of float ring seal leaks out the liquid that is back to pump inlet through balance sleeve 20, axial limiting baffle ring 10, outlet section 7, bearing magnet rotor 19, rotor 14, reflow pipe 2, base 1, stirrer 3, following radial magnetic bearing and simultaneously 3 radial magnetic bearings of shield electric machine and upper, middle and lower is played cooling action voluntarily behind the pump impeller.In order to overcome bigger flow resistance, determine the diameter of the floating ring 21 of float ring seal behind the big a little again pump impeller by calculating.Because the liquid that uses pump to carry cools off voluntarily to shield electric machine and magnetic suspension bearing, so this type of pump can not carry high temperature, contain the liquid that magnetizes solid particle.

This type of pump structure more complicated, efficient lower (lower by 10～15%) than conventional electronic multistage pump unit efficiency, the lift height does not have and leaks, and can carry normal temperature, contain the soda acid liquid of solid particle, the contactless fretting wear of bearing, long working life, automaticity height.

As required, this type of pump can be changed into horizontal type structure.

If the pump delivery temperature greater than 80 ℃ liquid, can add the water cooling chamber on inducer 4 and outlet section 7, the former plays heat-blocking action to following radial magnetic bearing; The latter with the pump impeller after below the floating ring 21 of the float ring seal liquid cooling to 80 of leaking out ℃, with cooling shield electric machine and 3 radial magnetic bearings in upper, middle and lower.

Fig. 7, radial magnetic bearing automatic control system schematic representation is described to be active magnetic bearing (see " mechanical design handbook " the 4th volume of Xu Hao chief editor, China Machine Press publishes in September, 1991) radially.It is made up of bearing support 4, bearing stator 2, bearing magnet rotor 3, gap probe 1, bearing stator wiring terminal 5, signal processor and controller etc.

Two gap probes 1 are measured the bearing radial gap value respectively, two radial clearance value signals are through two signal processor processes, by size of current and the distribution in the coil of controller control bearing stator 2, thereby change the radial force size and the direction of bearing magnet rotor 3, with the radial force of automatic balancing rotor, and make the rotor radial magnetic suspension.

Fig. 8, the automatic air supply device schematic representation is described to be to replenish the liquid compatible gases of carrying with pump in shielding motor rotor cavity or magnetic drive pump magnet rotor cavity, radial magnetic bearing magnet rotor cavity automatically.It is chewed 2, goes up liquid level sensor 3, is descended liquid level sensor 4 and controller etc. to form by solenoid valve 1, tonifying Qi adapter.

During pump work, when liquid level surpassed last liquid level sensor 3, its signal via controller was handled back control electromagnetic valve 1, takes over by tonifying Qi and chews 2 tonifying Qi; When liquid level was lower than liquid level sensor 4, its signal via controller was handled back control electromagnetic valve 1, stops tonifying Qi.The source of the gas of tonifying Qi is gas cylinder or gas compressor.

Claims (7)

1, a kind of magnetic suspension pump without shaft seal, form by shielding asynchronous electric motor, single-stage pump and radial magnetic bearing etc., rotor and pump shielding are in same housing, it is characterized in that: floating ring 4 diameters of the back float ring seal of pump impeller 30 are bigger than preceding float ring seal floating ring 1 diameter, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 6, reflow pipe 3.Have 2～4 grooves on the balance sleeve 6 and form axle sleeve balance valve with the floating ring 29 of float ring seal, rotor axial moves and promptly adjusts the valve opening size, thereby change the pressure of pump impeller 30 back, autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended; The motor stator of shielding asynchronous motor and radial magnetic bearing stator adopt freon R113 to evaporate self-loopa immersion cooling.The motor stator shielding, charging point 21 carries out freon R113 filling, level meter 19 is in order to observe freon liquid level height, plug screw 17 advances air when being used to discharge freon, freon R113 liquid absorbs the heat of motor stator and rotor generation, part becomes gas and floats on motor stator top, gas by be arranged on the motor housing 13 cooling tube at ambient temperature heat release become liquid, form the self-loopa of shield electric machine stator closed evaporating and soak cooling.The shielding of radial magnetic bearing stator, the freon R113 steam on shield electric machine stator top is by steam inlet pipe 15, the outer coated heat insulation layer of pipe, enter on a small quantity in the radial magnetic bearing stator, absorb heat and further expansion that bearing stator and bearing magnet rotor produce, through bearing cooling tube 22 at ambient temperature heat release become liquid, be back to down in the radial magnetic bearing stator 11, the freon R113 liquid that is back to down the radial magnetic bearing stator absorbs that the floating ring 4 of float ring seal leaks out behind heat that bearing stator and bearing magnet rotor produce and the impeller again is cooled to liquid below 80 ℃ through the heat of gas conduction, part becomes gas, be back to shield electric machine stator bottom through vapour-liquid reflow pipe 10 again, on, following two radial magnetic bearing stators also form the closed evaporating self-loopa and soak cooling; Automatic air supply device replenishes the liquid compatible gases of carrying with pump automatically to the rotor cavity.

2, magnetic suspension pump without shaft seal according to claim 1 from the cold shield magnetic suspension pump, form by shielding asynchronous motor, single-stage pump and radial magnetic bearing etc., rotor and pump shielding are in same housing, the liquid that shield electric machine and radial magnetic bearing utilize pump to carry cools off voluntarily, it is characterized in that: floating ring 4 diameters of the back float ring seal of pump impeller 19 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 17, axial limiting baffle ring 6, bearing magnet rotor 15, rotor 10, reflow pipe 3.Have 2～4 grooves on the balance sleeve 17 and form axle sleeve balance valve with the floating ring 18 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 19 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.

3, the magnetic force magnetic suspension pump of magnetic suspension pump without shaft seal according to claim 1, form by conventional asynchronous motor, magnetic drive device, single-stage pump and radial magnetic bearing etc., magnet rotor and pump shielding are in same housing, it is characterized in that: floating ring 4 diameters of the back float ring seal of pump impeller 31 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 6, reflow pipe 3.Have 2～4 grooves on the balance sleeve 6 and form axle sleeve balance valve with the floating ring 30 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 31 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended; The radial magnetic bearing stator adopts freon R113 to evaporate self-loopa immersion cooling.The shielding of radial magnetic bearing stator, charging point 24 carries out freon R113 filling, plug screw 14 is used for advancing air when discharging freon, level meter 21 is in order to observe the freon liquid level, down radially the freon R113 liquid in the magnetic suspension stator absorb that the floating ring 4 of float ring seal leaks out behind heat that bearing stator and bearing magnet rotor produce and the impeller be cooled to liquid below 80 ℃ through the heat of gas conduction, part becomes gas, gas is through steam inlet pipe 10, the outer coated heat insulation layer of pipe, enter in the radial magnetic bearing stator, freon R113 gas absorbs the heat of bearing stator and the generation of bearing magnet rotor and the heat and the further expansion of magnetic drive device generation again, through bearing cooling tube 22 at ambient temperature heat release become liquid, return down in the radial magnetic bearing stator, in the formation, cooling is soaked in following radial magnetic bearing stator closed evaporating self-loopa; Automatic air supply device replenishes the liquid compatible gases of carrying with pump automatically to the magnet rotor cavity.

4, the self cooling magnetic force magnetic suspension pump of magnetic suspension pump without shaft seal according to claim 1, form by conventional asynchronous motor, magnetic drive device, single-stage pump and radial magnetic bearing etc., magnet rotor and pump shielding are in same housing, the liquid that shield electric machine and radial magnetic bearing utilize pump to carry cools off voluntarily, it is characterized in that: floating ring 4 diameters of the back float ring seal of pump impeller 21 are bigger than floating ring 1 diameter of preceding float ring seal, rotor axial power in a basic balance.The liquid that the floating ring 4 of float ring seal leaks out behind the impeller is back to pump inlet through balance sleeve 19, axial limiting baffle ring 6, bearing magnet rotor 17, reflow pipe 3.Have 2～4 grooves on the balance sleeve 19 and form axle sleeve balance valve with the floating ring 20 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller 21 back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended.

5, the multistage magnetic suspension pump of the shielding of magnetic suspension pump without shaft seal according to claim 1, form by shielding asynchronous motor, multistage pump and radial magnetic bearing etc., rotor and multistage pump shielding are in same housing, it is characterized in that: floating ring 33 diameters of the back float ring seal of pump impeller than pump chopped-off head before floating ring 6 diameters of float ring seal big, rotor axial power in a basic balance.The liquid that the floating ring 33 of float ring seal leaks out behind the pump impeller is back to pump inlet through balance sleeve 32, reflow pipe 2, base 1, stirrer 3, following radial magnetic bearing.Have 2～4 grooves on the balance sleeve 32 and form axle sleeve balance valve with the floating ring 10 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended; 3 radial magnetic bearings in upper, middle and lower are set on the rotor; Adopt freon R113 that shield electric machine stator and last, middle axial magnetic pump bearing stator are evaporated self-loopa immersion cooling.The motor stator shielding, charging point 25 carries out freon R113 filling, plug screw 21 advances air when being used to discharge freon, level meter 23 is in order to observe freon liquid level height, freon R113 liquid absorbs the heat of motor stator and rotor generation, part becomes gas and floats on motor stator top, gas by be arranged on the motor housing 17 cooling tube at ambient temperature heat release become liquid, form the self-loopa of shield electric machine stator closed evaporating and soak cooling.The shielding of radial magnetic bearing stator, the freon R113 steam that covers motor stator top is by steam inlet pipe 20, the outer coated heat insulation layer of pipe, enter on a small quantity in the radial magnetic bearing stator, through bearing cooling tube 26 at ambient temperature heat release become liquid, be back in the radial magnetic bearing stator 15, the freon R113 liquid that is back to the radial magnetic bearing stator absorbs that the floating ring 33 of float ring seal leaks out behind heat that bearing stator and bearing magnet rotor produce and the pump impeller again is cooled to liquid below 80 ℃ through the heat of gas conduction, part becomes gas, be back to shield electric machine stator bottom through vapour-liquid reflow pipe 14 again, on, in two radial magnetic bearing stators also form the closed evaporating self-loopa and soak cooling; The liquid below 80 ℃ that is cooled to that is back to pump inlet that the floating ring 33 of float ring seal leaks out behind the pump impeller cools off following radial magnetic bearing; Inter-stage is provided with the floating ring 7 of float ring seal; Automatic air supply device replenishes the liquid compatible gases of carrying with pump automatically to the rotor cavity.

6, magnetic suspension pump without shaft seal according to claim 1 from the multistage magnetic suspension pump of cold shield, form by shield electric machine, multistage pump and radial magnetic bearing etc., rotor and pump shielding are in same housing, the liquid that shield electric machine and radial magnetic bearing utilize pump to carry cools off voluntarily, it is characterized in that: floating ring 21 diameters of the back float ring seal of pump impeller are bigger than floating ring 5 diameters of the preceding float ring seal of pump first stage impeller, rotor axial power in a basic balance.The liquid that the floating ring 21 of the back float ring seal of pump impeller leaks out is back to pump inlet through balance sleeve 20, axial limiting baffle ring 10, bearing magnet rotor 19, rotor 14, reflow pipe 2, base 1, stirrer 3, following radial magnetic bearing.Have 2～4 grooves on the balance sleeve 20 and form axle sleeve balance valve with the floating ring 8 of float ring seal.Rotor axial moves and promptly adjusts the valve opening size, thereby changes the pressure of pump impeller back, and autobalance comprises the axial force of working conditions change, and rotor axial liquid is suspended; 3 radial magnetic bearings in upper, middle and lower are set on the rotor; Inter-stage is provided with the floating ring 6 of float ring seal.

7, automatic air supply device according to claim 1, form by solenoid valve, last liquid level sensor, following liquid level sensor and controller etc., it is characterized in that: in shielding motor rotor cavity or magnetic drive pump magnet rotor cavity, radial magnetic bearing magnet rotor cavity, replenish the liquid compatible gases of carrying automatically with pump, when liquid level surpasses last liquid level sensor 3, its signal via controller is handled back control electromagnetic valve 1, takes over by tonifying Qi and chews 2 tonifying Qi; When liquid level was lower than liquid level sensor 4, its signal via controller was handled back control electromagnetic valve 1, stops tonifying Qi.

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