CN111810439A - Anti-dead-bearing structure of serial multistage pump sliding bearing and multistage canned motor pump - Google Patents
Anti-dead-bearing structure of serial multistage pump sliding bearing and multistage canned motor pump Download PDFInfo
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- CN111810439A CN111810439A CN202010830138.XA CN202010830138A CN111810439A CN 111810439 A CN111810439 A CN 111810439A CN 202010830138 A CN202010830138 A CN 202010830138A CN 111810439 A CN111810439 A CN 111810439A
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- pump
- bearing
- thrust bearing
- motor
- canned motor
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- 238000007789 sealing Methods 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 3
- 229910000856 hastalloy Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000007770 graphite material Substances 0.000 claims 1
- 239000006163 transport media Substances 0.000 claims 1
- 230000008016 vaporization Effects 0.000 abstract description 5
- 230000020169 heat generation Effects 0.000 abstract description 4
- 238000009834 vaporization Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910002804 graphite Inorganic materials 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- 239000002131 composite material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 206010057040 Temperature intolerance Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008543 heat sensitivity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/061—Lubrication especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
Abstract
The invention provides a serial multistage pump sliding bearing anti-locking structure and a multistage canned motor pump, wherein the serial multistage pump sliding bearing anti-locking structure is a thrust bearing disc (16) arranged between a thrust bearing and a sliding bearing, the thrust bearing disc (16) is annular, and a plurality of arc-shaped grooves (17) are uniformly distributed on one side, close to the thrust bearing, of the thrust bearing disc (16) along the radial direction. One side of the arc-shaped groove (17) close to the center of the circular ring is provided with an axial arc groove (18), and the opening of the axial arc groove (18) faces the center of the circular ring. The structure can avoid the bearing system from generating clinging and unnecessary high-speed friction heat generation, and avoid the local high-temperature vaporization and quality change of the medium in the bearing.
Description
Technical Field
The invention relates to the technology of electric pumps, in particular to a tandem type multistage pump sliding bearing anti-dead structure and a multistage canned motor pump.
Background
The sealless canned motor pump is widely applied to the fields of high-risk fluid transportation such as petroleum, petrochemical industry, nuclear power and the like. The series multistage canned motor pump is suitable for the working condition of high lift. With the application of the series type multistage canned motor pump, the requirement on the series reliability is higher and higher.
The axial thrust bearing is composed of non-metal graphite composite material and metal thrust disk sleeve, and forms an axial friction pair system with the sliding bearing, especially bears the destructive force of the axial float of the inertial rotation of the high-speed rotor at the moment of starting and stopping the pump. If a certain instant graphite composite material is tightly attached to a metal sleeve disc, the axial force can cause serious abrasion or even damage to any side when the graphite composite material moves to any side, even if the pump completes the balance and adjustment of the axial force during testing, because different medium characteristics and complex working conditions, certain high-risk fluids have extremely strong heat sensitivity, a little friction heat can cause the polymerization reaction of the fluids, excessive heat can cause the local vaporization of the fluids, and the graphite composite material is extremely unfavorable for the use of a shielding electric pump, and has the possibility of damage.
Disclosure of Invention
The invention aims to provide an anti-dead-bearing structure of a serial multi-stage pump sliding bearing, aiming at the requirement of the reliability of the current serial multi-stage canned motor pump, which can avoid the bearing system from generating close contact and unnecessary high-speed friction heat generation and avoid the local high-temperature vaporization and quality change of a medium in a bearing.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a serial-type multistage pump slide bearing is prevented by dead structure for setting up the thrust bearing dish between thrust bearing and slide bearing, the thrust bearing dish is the ring form, one side that the thrust bearing dish is close to thrust bearing radially the equipartition a plurality of arc walls.
Further, the number of the arc-shaped grooves is 6-12, and 8 is preferred. The size and number of slots may be varied according to the actual engineering application.
Furthermore, one side of the arc-shaped groove, which is close to the center of the circular ring, is provided with an axial arc groove, and the opening of the axial arc groove faces the center of the circular ring.
Further, the thrust bearing disc is made of nonmetal PTFE (polytetrafluoroethylene) impregnated graphite.
Further, the thickness of the thrust bearing disc is 6-12 mm.
The invention also discloses a multistage canned motor pump, which adopts the serial multistage canned motor sliding bearing anti-dead structure, and comprises a canned motor stator shell, a front impeller group and a rear impeller group, wherein a canned motor shaft rotor component is arranged in the canned motor stator shell in a penetrating way, a canned motor shell front cover and a canned motor rear cover are respectively arranged at two ends of the canned motor stator shell, the canned motor shell front cover is connected with the front impeller group, and the canned motor rear cover is connected with the rear impeller group; and a rotating shaft of the front impeller set of the shielding motor is communicated with the rear impeller set of the shielding motor through a shielding electric pump shaft rotor assembly. The front impeller group comprises a suction end cover, a shielding motor front impeller group, a front thrust bearing, a front sliding bearing and a front bearing body, and the suction end cover is arranged on one side of the shielding motor front impeller group, which is far away from the shielding motor stator shell; the front sliding bearing is fixedly arranged on the front bearing body, the front thrust bearing is arranged at one end of a coaxial rotor of the pump and the motor, and a thrust bearing disc is arranged between the front thrust bearing and the front sliding bearing;
the rear impeller group comprises a rear sealing cover, a pump body, a shielded motor rear impeller group, a rear bearing body, a rear sliding bearing and a rear thrust bearing, the pump body is an outlet of the shielded pump, the rear sealing cover is arranged on one side of the impeller group, which is far away from a stator shell of the shielded motor, and the rear sealing cover and the pump body jointly form a rear sealing shell of the whole shielded pump; the rear sliding bearing is fixedly arranged on the rear bearing body, the rear thrust bearing 1 is arranged at the other end of the coaxial rotor of the pump and the motor, and a thrust bearing disc is arranged between the rear thrust bearing and the rear sliding bearing.
The thrust bearings (front thrust bearing and rear thrust bearing) and the thrust bearing discs thereof form the radial fulcrum position and the axial thrust position of the whole pump rotor supporting system, namely the moving part of the bearing system, the front bearing and the rear bearing are reliably fixed on two bearing bodies, and the silicon carbide bush is lined in the bearings to form the static part of the supporting point of the bearing system. The anti-dead-bearing structure of the serial multistage pump sliding bearing can prevent the bearing system from generating adhesion and unnecessary high-speed friction heat generation in the process, and prevent a medium from locally heating and vaporizing and changing in quality in the bearing.
Furthermore, the inner side of the stator shell of the shielding motor is coated by nonmagnetic hastelloy, so that the stator shell is prevented from being invaded and damaged by a conveying medium.
Furthermore, an air gap (generally about 2 mm-3 mm) is arranged between the stator housing of the shielding motor and the rotor assembly of the shielding electric pump shaft, and a cavity of the front impeller group is communicated with the air gap.
Furthermore, a rotor shaft of the shielding electric pump shaft rotor assembly is a hollow shaft, and the aperture of a central hole of the hollow shaft is determined according to the design of a motor and the design of a circulating channel; two ends of the hollow shaft are respectively provided with a radial hole (slotted hole), and the radial holes are designed to have corresponding sizes according to different sizes of pumps and motors; and two ends of the central hole are respectively communicated with the radial holes.
Further, the chamfer angle of the radial hole (slot hole) is designed to be corresponding in size according to different sizes of pumps and motors.
Furthermore, the radial holes are arranged at staggered positions, which means that two vertical radial slots are arranged at axial opposite positions, and are generally staggered for a certain distance, and the staggered positions do not need to be considered for a smaller shaft diameter. Specifically, the design is carried out according to the aperture diameter ratio, the intersection ratio is 1/3-1/2 of the aperture, and if the aperture is too small, the aperture can be completely centered without considering the interleaving.
The working principle of the multistage shielding electric pump is as follows:
high-pressure fluid enters the pump from the suction end cover and is pressurized step by step through the impeller set and the multistage impellers of the impeller set, part of the fluid flows through an air gap between the rotor and the stator shielding sleeve to cool the motor, eddy current heat is taken away, the front sliding bearing and the rear sliding bearing are immersed, lubricating fluid for supporting the whole motor rotor is provided, and dynamic pressure fluid liquid films are formed to support the whole rotor.
The other part of the fluid flows through the hollow shaft, two groups of radial holes (slotted holes) meet the requirement of increasing the fluid flow area, the slotted hole chamfers are enlarged, the local loss is reduced, the slotted holes are vertically and alternately arranged, the mechanical strength of the hole opening area is increased, and the mechanical strength of the shaft with the radial slotted holes at the staggered positions is higher than that of the slotted holes at the same position. Practice proves that the invention meets the requirement of increasing flow and reduces local resistance loss.
Compared with the prior art, the serial multistage pump sliding bearing anti-dead structure and the multistage canned motor pump have the following advantages that:
1) according to the thrust bearing disc 16, the plurality of arc-shaped grooves 17 are uniformly distributed on one side of each arc-shaped groove 17 along the radial direction, the axial arc-shaped grooves 18 are formed in one sides, close to the center of the circular ring, of the arc-shaped grooves 17, dynamic pressure fluid circulates in the through arc-shaped grooves, and even if a rotor moves, dry grinding cannot occur and the reliability problem cannot occur due to the fact that the fluid forms dynamic pressure flowing in the grooves. If the ultra-high temperature fluid uses a pure graphite thrust bearing disc, similar arc grooves can be oppositely processed on the surface of the metal thrust disc sleeve, and the arc grooves can also be processed on the end surface of the friction pair sliding bearing to form a dynamic pressure film of the fluid, so that the series multistage canned motor pump is more reliable. The anti-dead structure of the sliding bearing of the French civilian serial multistage pump can also be applied to other types of canned motor pumps.
2) The multistage canned motor pump with the internal circulation hole improves the internal flow, reduces the internal fluid flow loss, avoids the complex structure of an external circulation pipeline when the large flow is required, reduces the cost, and has safer and more reliable high-pressure internal circulation structure.
3) Because the clearance of stator shield cover and rotor shield cover is very little, when requiring great flow, fluid can only carry through the hollow shaft and pass through the canned motor region, simultaneously because the limited of axle diameter, single round hole or slot type hole all have certain drawback, at first the rotor shaft centre bore is definite, need increase the flow area of radial hole, the hole of the same area can not maintain the fluid circulation needs, the fluid gets into the hollow shaft and produces great local loss when flowing out the hollow shaft, simultaneously when the fluid in the hollow shaft flows, is equivalent to the effect of orifice plate, has reduced fluid pressure. The invention meets the requirement of increasing the fluid flow area through two groups of slotted holes, enlarges the chamfer angle of the slotted hole, reduces the local loss, increases the mechanical strength of the hole opening area through vertically and alternately arranging the slotted holes, and proves that the mechanical strength of the shaft for opening the radial slotted holes at the staggered positions is higher than that of the slotted holes at the same position. Practice proves that the invention meets the requirement of increasing flow and reduces local resistance loss.
Drawings
FIG. 1 is a schematic diagram of a multi-stage canned motor pump according to the present invention;
FIG. 2 is a schematic view of the installation of the anti-lock structure of the sliding bearing of the tandem type multistage pump of the present invention;
FIG. 3 is a front view of the tandem type multistage pump sliding bearing anti-lock structure of the present invention;
fig. 4 is a right side view in mid-section of fig. 3.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses a series type multistage pump sliding bearing anti-locking structure, as shown in fig. 2-4, the series type multistage pump sliding bearing anti-locking structure is a thrust bearing disc 16 arranged between a thrust bearing and a sliding bearing, the thrust bearing disc 16 is annular, and a plurality of arc-shaped grooves 17 are uniformly distributed on one side of the thrust bearing disc 16 close to the thrust bearing along the radial direction.
The number of the arc-shaped grooves is 6-12, and 8 is preferred. The size and number of slots may be varied according to the actual engineering application.
One side of the arc-shaped groove 17 close to the center of the circular ring is provided with an axial arc groove 18, and the opening of the axial arc groove 18 faces the center of the circular ring.
The thrust bearing disc is made of nonmetal PTFE (polytetrafluoroethylene) impregnated graphite.
The thickness of the thrust bearing disc is 6-12 mm.
Example 2
The embodiment discloses a multistage canned motor pump, as shown in fig. 1, the multistage canned motor pump comprises a canned motor stator housing 7, a front impeller assembly and a rear impeller assembly, a canned motor pump shaft rotor assembly 8 penetrates through the canned motor stator housing 7, a canned motor housing front cover 6 and a canned motor rear cover 9 are respectively arranged at two ends of the canned motor stator housing 7, the canned motor housing front cover 6 is connected with the front impeller assembly, and the canned motor rear cover 9 is connected with the rear impeller assembly; and a rotating shaft of the shielding motor front impeller group 2 is communicated with the shielding motor rear impeller group 13 through a shielding electric pump shaft rotor assembly 8. The front impeller group comprises a suction end cover 1, a shielding motor front impeller group 2, a front thrust bearing 3, a front sliding bearing 4 and a front bearing body 5, and the suction end cover 1 is covered on one side of the shielding motor front impeller group 2, which is far away from a shielding motor stator shell 7; the front sliding bearing 4 is fixedly arranged on the front bearing body 5, the front thrust bearing 3 is arranged at one end of a coaxial rotor of the pump and the motor, and a thrust bearing disc 16 is arranged between the front thrust bearing 3 and the front sliding bearing 4;
the rear impeller group comprises a rear sealing cover 15, a pump body 14, a shielded motor rear impeller group 13, a rear bearing body 10, a rear sliding bearing 11 and a rear thrust bearing 12, the pump body 14 is an outlet of the shielded pump, the rear sealing cover 15 is covered on one side of the impeller group 13, which is far away from the stator shell 7 of the shielded motor, and the rear sealing cover 15 and the pump body 14 jointly form a rear sealing shell of the whole shielded pump; the rear sliding bearing 11 is fixedly arranged on the rear bearing body 10, the rear thrust bearing 12 is arranged at the other end of the coaxial rotor of the pump and the motor, and a thrust bearing disc is arranged between the rear thrust bearing 12 and the rear sliding bearing 11.
The thrust bearings (the front thrust bearing 3 and the rear thrust bearing 12) and the thrust bearing discs thereof form a radial fulcrum position and an axial thrust position of the whole pump rotor supporting system, namely a moving part of the bearing system, the front bearing and the rear bearing are reliably fixed on two bearing bodies, and the bearings are lined with silicon carbide bushings to form a static part of the supporting point of the bearing system. The anti-dead-bearing structure of the serial multistage pump sliding bearing can prevent the bearing system from generating adhesion and unnecessary high-speed friction heat generation in the process, and prevent a medium from locally heating and vaporizing and changing in quality in the bearing.
The inner side of the stator shell 7 of the shielding motor is coated by nonmagnetic hastelloy, so that the stator is prevented from being invaded and damaged by a conveying medium.
An air gap (generally about 2 mm-3 mm) is arranged between the stator housing 7 of the shielding motor and the shielding electric pump shaft rotor assembly 8, and a cavity of the front impeller group 2 is communicated with the air gap.
The rotor shaft of the shielding electric pump shaft rotor assembly 8 is a hollow shaft, and the aperture of a central hole of the hollow shaft is determined according to the design of a motor and the design of a circulating channel; two ends of the hollow shaft are respectively provided with a radial hole (slotted hole), and the radial holes are designed to have corresponding sizes according to different sizes of pumps and motors; and two ends of the central hole are respectively communicated with the radial holes.
The chamfer angle of the radial hole (slot hole) is designed to have corresponding size according to different sizes of pumps and motors.
The radial holes are arranged at staggered positions, and the staggered positions of the radial holes are relative positions of two vertical radial slotted holes in the axial direction, and are generally staggered for a certain distance, and the staggered positions do not need to be considered for smaller shaft diameter. Specifically, the design is carried out according to the aperture diameter ratio, the intersection ratio is 1/3-1/2 of the aperture, and if the aperture is too small, the aperture can be completely centered without considering the interleaving.
The working principle of the multistage shielding electric pump is as follows:
high-pressure fluid enters the pump from the suction end cover 1, is pressurized step by step through the multistage impellers of the impeller set 2 and the impeller set 13, part of the fluid flows through an air gap between the rotor and the stator shielding sleeve in the process to cool the motor, takes away eddy current heat, simultaneously submerges the front sliding bearing 4 and the rear sliding bearing 11, provides lubricating fluid for supporting the whole motor rotor, and simultaneously forms a dynamic pressure fluid liquid film for supporting the whole rotor.
The other part of the fluid flows through the hollow shaft, two groups of radial holes (slotted holes) meet the requirement of increasing the fluid flow area, the slotted hole chamfers are enlarged, the local loss is reduced, the slotted holes are vertically and alternately arranged, the mechanical strength of the hole opening area is increased, and the mechanical strength of the shaft with the radial slotted holes at the staggered positions is higher than that of the slotted holes at the same position. Practice proves that the invention meets the requirement of increasing flow and reduces local resistance loss.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a serial-type multistage pump slide bearing anti-lock structure, its characterized in that for thrust bearing dish (16) of setting between thrust bearing and slide bearing, thrust bearing dish (16) are the ring form, one side that thrust bearing dish (16) is close to thrust bearing radially equipartition a plurality of arc walls (17).
2. The tandem type multistage pump sliding bearing anti-lock structure according to claim 1, wherein the number of the arc-shaped grooves is 6 to 12.
3. The tandem type multistage pump sliding bearing anti-lock structure according to claim 1, wherein one side of the arc-shaped groove (17) close to the center of the circular ring is provided with an axial arc groove (18), and the axial arc groove (18) is opened toward the center of the circular ring.
4. The tandem type multistage pump sliding bearing anti-lock structure according to claim 1, wherein the thrust bearing disc is of non-metallic PTFE impregnated graphite material.
5. The sliding bearing anti-lock structure of a tandem type multistage pump according to claim 1, wherein the thickness of the thrust bearing disc is 6-12 mm.
6. A multi-stage canned motor pump, characterized in that, the anti-lock structure of the tandem multi-stage pump sliding bearing of claims 1-5 is adopted, the multi-stage canned motor pump comprises a canned motor stator housing (7), a front impeller set and a rear impeller set, a canned motor pump shaft rotor assembly (8) is arranged in the canned motor stator housing (7) in a penetrating way, a canned motor housing front cover (6) and a canned motor rear cover (9) are respectively arranged at two ends of the canned motor stator housing (7), the canned motor housing front cover (6) is connected with the front impeller set, and the canned motor rear cover (9) is connected with the rear impeller set; a rotating shaft of the shielding motor front impeller group (2) is communicated with a rotating shaft of the shielding motor rear impeller group (13) through a shielding electric pump shaft rotor assembly (8);
the front impeller group comprises a suction end cover (1), a shielding motor front impeller group (2), a front thrust bearing (3), a front sliding bearing (4) and a front bearing body (5), and the suction end cover (1) is covered on one side of the shielding motor front impeller group (2) departing from a shielding motor stator shell (7); the front sliding bearing (4) is fixedly arranged on the front bearing body (5), the front thrust bearing (3) is arranged at one end of a coaxial rotor of the pump and the motor, and a thrust bearing disc (16) is arranged between the front thrust bearing (3) and the front sliding bearing (4);
the rear impeller group comprises a rear sealing cover (15), a pump body (14), a motor-shielded rear impeller group (13), a rear bearing body (10), a rear sliding bearing (11) and a rear thrust bearing (12), the pump body (14) is an outlet of a shielding pump, the rear sealing cover (15) is arranged on one side, deviating from a stator shell (7) of the shielding motor, of the impeller group (13) in a covering mode, and the rear sealing cover (15) and the pump body (14) jointly form a rear sealing shell of the whole shielding pump; the rear sliding bearing (11) is fixedly arranged on the rear bearing body (10), the rear thrust bearing (12) is arranged at the other end of the coaxial rotor of the pump and the motor, and a thrust bearing disc is arranged between the rear thrust bearing (12) and the rear sliding bearing (11).
7. The multistage canned motor pump according to claim 6, characterized in that the canned motor stator housing (7) is coated on the inside with magnetically non-conductive hastelloy, protected from the attack and destruction of the transport medium.
8. The multistage canned electric pump according to claim 6, characterized in that an air gap is provided between the canned motor stator housing (7) and the canned motor pump shaft rotor assembly (8), the chamber of the front impeller set (2) communicating with the air gap.
9. The multistage canned electric pump according to claim 6, characterized in that the rotor shaft of the canned electric pump shaft rotor assembly (8) is a hollow shaft; the hollow shaft is provided with radial holes at two ends respectively, and two ends of the central hole are communicated with the radial holes respectively.
10. The multi-stage canned motor pump of claim 6, wherein said radial holes are provided in staggered positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010830138.XA CN111810439A (en) | 2020-08-18 | 2020-08-18 | Anti-dead-bearing structure of serial multistage pump sliding bearing and multistage canned motor pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010830138.XA CN111810439A (en) | 2020-08-18 | 2020-08-18 | Anti-dead-bearing structure of serial multistage pump sliding bearing and multistage canned motor pump |
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| Publication Number | Publication Date |
|---|---|
| CN111810439A true CN111810439A (en) | 2020-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010830138.XA Pending CN111810439A (en) | 2020-08-18 | 2020-08-18 | Anti-dead-bearing structure of serial multistage pump sliding bearing and multistage canned motor pump |
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| CN (1) | CN111810439A (en) |
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| CN202659519U (en) * | 2012-06-25 | 2013-01-09 | 合肥新沪屏蔽泵股份有限公司 | Internal pressurized multistage shield pump for conveying easily gasifying medium |
| CN103912524A (en) * | 2014-04-25 | 2014-07-09 | 无锡市安化屏蔽电泵厂 | Shield electric pump for conveying media easy to solidify and crystallize |
| CN205423282U (en) * | 2016-03-23 | 2016-08-03 | 上海水泵制造有限公司 | Multistage pump bearing arrangement that slow -speed of revolution starts |
| CN206129615U (en) * | 2016-11-01 | 2017-04-26 | 武汉椿岭科技有限公司 | Circulating water horizontal centrifugal pump |
| CN110030193A (en) * | 2019-05-16 | 2019-07-19 | 上海创科泵业制造有限公司 | Multi-stage shield pump and the water-carriage system for applying it |
| CN211116616U (en) * | 2019-11-06 | 2020-07-28 | 大连金石泵业有限公司 | Multistage tandem type slurry type canned motor pump |
| CN213360544U (en) * | 2020-08-18 | 2021-06-04 | 大连海密梯克泵业有限公司 | Anti-dead-bearing structure of serial multistage pump sliding bearing and multistage canned motor pump |
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