CN111503003A - Small-flow high-lift efficient multi-stage rotary shell centrifugal pump - Google Patents
Small-flow high-lift efficient multi-stage rotary shell centrifugal pump Download PDFInfo
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- CN111503003A CN111503003A CN202010448336.XA CN202010448336A CN111503003A CN 111503003 A CN111503003 A CN 111503003A CN 202010448336 A CN202010448336 A CN 202010448336A CN 111503003 A CN111503003 A CN 111503003A
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 24
- 230000000712 assembly Effects 0.000 claims description 11
- 238000000429 assembly Methods 0.000 claims description 11
- 239000010687 lubricating oil Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
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- 238000005452 bending Methods 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage 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
- 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
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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
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
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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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing 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
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a small-flow high-lift efficient multistage spiral shell centrifugal pump. Comprises a main shaft, an inlet end part, a pump shell, a left bearing box and a right bearing box; the left bearing box, the link, the import tip, pump casing and right bearing box connect gradually and constitute multistage spiral shell centrifugal pump's shell structure, be equipped with tertiary coaxial coupling's rotor structure subassembly in the pump casing, main shaft one end is passed left bearing box in proper order, the link, behind the import tip and the pump casing first order rotor structure subassembly synchronous revolution ground connect, the inlet has been seted up to the import tip, liquid gets into tertiary rotor structure subassembly through the inlet, third level rotor structure subassembly stretches out right bearing box and pumps out liquid. The invention has the characteristics of small flow, high lift and high efficiency, is an ultra-low specific speed pump with small flow and high lift, has high working efficiency and low rotating speed compared with a high-rotating-speed centrifugal pump, can increase the number of stages of the pump according to the actual requirement of conveying media, and is not limited to a 3-stage pump.
Description
Technical Field
The invention relates to a small-flow high-lift efficient multi-stage centrifugal pump with a rotary shell, in particular to a multi-stage efficient centrifugal pump with a rotary shell, which is used for fluid conveying in the fields of petrochemical industry, papermaking, food and the like.
Background
Aiming at meeting the requirement of low flow and high lift at present, a high-speed centrifugal pump, namely a partial flow pump, is often adopted in actual production, and the low efficiency and unstable operation are easy to occur under the condition of low specific speed in the operation process.
The rotary shell centrifugal pump, i.e. rotary jet pump, is a single-stage, cantilever type, small-flow and high-lift pump, which is mainly used in the fields of petrochemical industry, paper making, food and the like at present and is used for conveying clean liquid or liquid containing solid particles. Thereafter, the centrifugal pump with the rotary shell has the advantages of simple structure, small volume, stable operation, low rotating speed, good cavitation resistance and good sealing performance, and has good reputation and strong subsequent development in the fields, so that the centrifugal pump with the rotary shell is more widely applied. The rotary shell centrifugal pump is a liquid delivery pump of a drilling and flushing system and a feeding pump of a carbon black production line in the automobile manufacturing industry at present, and is a first-choice device in the field of deep well waste treatment in a chemical plant, and a standard matching device of a high-pressure cleaning system in food processing, manufacturing workshops, paper making industry and the like.
In these practical engineering applications, such single-stage, cantilevered centrifugal pumps with a rotating casing already have very good performance, and the advantage of a small flow rate and a high lift, i.e. a low specific speed, is compatible with the characteristics of the high-speed centrifugal pumps that need to be improved.
Disclosure of Invention
Under the technical background and in combination with the problems encountered in actual production, aiming at the defects of the high-speed centrifugal pump in the aspects of efficiency and stability, the invention makes some technical improvements and optimizations on the basis of the rotary shell centrifugal pump in order to overcome the defects of the traditional high-speed centrifugal pump in the background technology, and the inventor invents a small-flow high-lift high-efficiency multistage rotary shell centrifugal pump which can be used for fluid conveying in the fields of petrochemical industry, paper making, food and the like.
The technical scheme adopted by the invention is as follows:
the invention comprises a main shaft, an inlet end part, a pump shell, a left bearing box and a right bearing box; the left bearing box, the link, the import tip, pump casing and right bearing box connect gradually and constitute multistage spiral shell centrifugal pump's shell structure, be equipped with tertiary coaxial coupling's rotor structure subassembly in the pump casing, main shaft one end is passed left bearing box in proper order, the link, behind the import tip and the pump casing first order rotor structure subassembly synchronous revolution ground connect, the inlet has been seted up to the import tip, liquid gets into tertiary rotor structure subassembly through the inlet, third level rotor structure subassembly stretches out right bearing box and pumps out liquid.
A liquid inlet is formed in the side wall of one side of the inlet end part, and an annular inner cavity is formed in the periphery of the inlet end part through which the main shaft passes and is communicated with the liquid inlet; each stage of rotor structure assembly comprises a centrifugal impeller, a rotor cavity shell and a collecting pipe, wherein the centrifugal impeller and the collecting pipe are installed in a cavity inside the rotor cavity shell, the centrifugal impeller is positioned in one side, close to the upstream, of an inner cavity of the rotor cavity shell, the peripheral edge of the centrifugal impeller is fixedly connected to the inner circumferential surface of the rotor cavity shell, the collecting pipe is positioned in one side, close to the downstream, of the inner cavity of the rotor cavity shell, the side, close to the downstream, of the inner cavity of the rotor cavity shell serves as a rotor cavity, and fluid media are driven to flow into the;
the collecting pipe comprises a shaft part, a diameter part and a bent part, wherein the shaft part and the main shaft are coaxially arranged, the diameter part is arranged along the direction vertical to the main shaft, the inner end of the diameter part is connected to the side face of the middle part of the shaft part to form L shapes, the outer end of the diameter part is perpendicularly bent along the tangential direction of the circumference to form the bent part, the tangential direction of the bent part of the collecting pipe is opposite to the tangential direction of the needle direction when the whole formed by the rotor cavity shell and the centrifugal impeller rotates around the main shaft and the shaft part of the collecting pipe, a through hollow channel is formed inside the shaft part, the diameter part and the bent part of the collecting pipe, one end of the hollow channel penetrates out from one end of the shaft part far away from the main shaft, the other end of the hollow channel is communicated to the bent part from the shaft part and penetrates out from the.
The rotor cavity shells of the three-stage rotor structure assembly are coaxially and fixedly connected, and horizontal through holes are formed in the centers of the two horizontal end faces; the horizontal through hole of the front end face of the rotor cavity shell of the first-stage rotor structure component is directly communicated with the annular inner cavity, and the main shaft extends into the rotor cavity shell of the first-stage rotor structure component from the horizontal through hole of the front end face of the rotor cavity shell.
The front end of the shaft part of the collecting pipe of the first-stage rotor structural assembly is rotatably connected with the end part of the main shaft through a rolling bearing; the rear ends of the shaft parts of the collecting pipes of the first-stage and second-stage rotor structure assemblies extend out of the horizontal through hole on the rear end face of the rotor cavity shell of the first-stage and second-stage rotor structure assemblies, then extend into the rotor cavity shell of the next-stage rotor structure assembly and are coaxially connected with the front end of the shaft part of the collecting pipe in the rotor cavity shell of the next-stage rotor structure assembly; the rear ends of the shaft parts of the collecting pipes of the first-stage rotor structure assembly and the second-stage rotor structure assembly are provided with side wall through holes in the vertical direction, and fluid in the collecting pipes flows into a rotor cavity shell of the next-stage rotor structure assembly through the side wall through holes; the rear end of the shaft part of the collecting pipe of the third-stage rotor structure assembly extends out of the rotor cavity shell of the third-stage rotor structure assembly and then penetrates out of the right bearing box, and a hollow pipeline port at the rear end of the shaft part of the collecting pipe of the third-stage rotor structure assembly is used as a liquid outlet; the rear end of the shaft part of the collecting pipe of the third-stage rotor structure assembly extends out of the rotor cavity shell and is movably sleeved with a hollow shaft in the right bearing box, and the hollow shaft is connected with the rotor cavity shell of the third-stage rotor structure assembly through bolts.
A central inner hole of a centrifugal impeller of the first-stage rotor structural assembly is coaxially and fixedly sleeved on the main shaft, a gap is formed between the centrifugal impeller and the wall of a horizontal through hole on the front end surface of a rotor cavity shell of the first-stage rotor structural assembly, and the gap is communicated with the annular inner cavity; centrifugal impellers of the second-stage rotor structure assembly and the third-stage rotor structure assembly are rotatably sleeved at the front ends of shaft parts of the collecting pipes respectively through water-lubricated bearing shafts; a circumferential gap is formed between the rotor cavity shell of the three-stage rotor structural assembly and the inner circumferential surface of the pump shell, so that the rotor cavity shell of the three-stage rotor structural assembly and the respective impeller form a whole and rotate around the main shaft and the shaft part of the respective collecting pipe.
The bearing device is characterized in that one end of the main shaft is supported and sleeved in the left bearing box through the sliding bearing, lubricating oil is filled in the left bearing box, the other end of the main shaft is coaxially connected with an output shaft of the motor through the coupler, and the motor drives the main shaft to rotate under the support of the sliding bearing and self-lubricate through the lubricating oil in the left bearing box.
The centrifugal impeller is formed by a plurality of blades which are arranged at intervals along the circumference, and gaps through which fluid passes are formed between adjacent blades.
The hollow shaft is sleeved on a collecting pipe of the third-level rotating structure assembly, a sliding bearing and a thrust bearing are installed on the inner ring of the hollow shaft, the hollow shaft is movably sleeved with the collecting pipe of the third-level rotating structure assembly in a matched mode through the sliding bearing and the thrust bearing, and one end, close to the main shaft, of the hollow shaft is fixedly connected with a rotor cavity shell of the third-level rotating structure assembly through a bolt.
And a felt ring is arranged between the main shaft and the inner wall of the inlet end part when the main shaft penetrates through the inlet end part for sealing.
The rotor cavity shell and the centrifugal impeller in each stage of rotating structure assembly are integrally cast.
The multi-stage rotary shell centrifugal pump is applied to fluid conveying in the fields of petrochemical industry, papermaking, food and the like.
Fluid medium flows in through the liquid inlet, the three rotor cavity shells of the whole pump and three centrifugal impellers rotate at high speed through the rotation of the main shaft and the hollow shaft, fluid enters the first-stage rotor cavity rotating synchronously at high speed from an L-shaped flow passage and an annular flow passage under the action of centrifugal force, so that liquid around the rotor cavity has high pressure, the high-speed liquid flows into a static collecting pipe, the collecting pipe is equivalent to a water pumping chamber of a common centrifugal pump and has a pressure expansion effect, the speed energy is converted into pressure energy, then the output high-pressure liquid is conveyed into the second-stage rotor cavity through the collecting pipe, and finally the high-pressure liquid is output from the collecting pipe of the rotor cavity of the third-stage pump.
The multi-stage rotary shell centrifugal pump has the characteristics of small flow, high lift and high efficiency, is an ultra-low specific speed pump with small flow and high lift, and has high working efficiency and low rotating speed compared with a high-rotating-speed centrifugal pump. In the patent of the invention, the multi-stage spiral shell centrifugal pump is only exemplified by a three-stage pump, according to the invention, the multi-stage pump can be disassembled into a single stage or 2 stages, the stage number of the pump can be increased according to the actual conveying medium requirement, and the invention is not limited to a 3-stage pump.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the technical problems that the efficiency is low due to low specific speed and the work is easy to be unstable under the condition of small flow in the work process, the invention is modified on the basis of the rotary shell centrifugal pump, so that the efficiency and the stability can be better improved while the requirement of small flow and high lift is met. In the field of small flow and high lift, namely low specific speed, a high-speed pump does not need to be multistage, and the invention optimally adopts a multistage spiral shell centrifugal pump to meet the requirement of high lift.
The invention adopts the structure that the rotor cavity of the common rotary shell centrifugal pump, the collecting pipe and the impeller in the rotor cavity are combined in series, thereby forming the multistage rotary shell centrifugal pump, and the lift flow of the multistage rotary shell centrifugal pump can be adjusted according to the production requirement. The multi-stage rotary shell centrifugal pump is 3-30 m3About/h, the pump head is over 1000 m, if the conventional high-speed centrifugal pump (generally designed rotor) is adoptedSpeed is more than 10000 r/min) is basically about 20-30%. In the invention, under the same working condition, the efficiency can reach more than 40-50%, the rotating speed is low (about 5000 r/min), the left end and the right end of the multi-stage rotary shell centrifugal pump are provided with the sliding bearings, and the right end of the multi-stage rotary shell centrifugal pump is provided with the thrust bearing, so that the stability of the whole rotating system at the ultra-low specific rotating speed can be ensured.
The invention is modified on the basis of the rotary shell centrifugal pump, innovatively adopts a multi-stage series connection mode to increase the lift, the pump with low specific speed and small flow can generate certain influence on the stability, the sliding bearings are arranged at the two ends of the multi-stage rotary shell centrifugal pump, and the thrust bearing is arranged at the right end of the multi-stage rotary shell centrifugal pump, so that the rotating precision and the stability of the multi-stage rotary shell centrifugal pump are improved, and the multi-stage rotary shell centrifugal pump has more excellent performance.
Compared with the traditional high-speed centrifugal pump, the device improves the efficiency and stability of the centrifugal pump.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
In the figure: 1. the device comprises a motor, 2, a coupler, 3, a main shaft, 4, a left bearing box, 5, a sliding bearing, 6, a connecting frame, 7, a mechanical seal, 8, a felt ring, 9, an inlet end part, 10, a liquid inlet, 11, an annular inner cavity, 12, a rolling bearing, 13, a centrifugal impeller, 14, a collecting pipe, 15, a rotor cavity, 16, a side wall through hole, 17, a water lubricating bearing, 18, a rotor cavity shell, 19, a pump shell, 20, a hollow shaft, 21, a sliding bearing, 22, a thrust bearing, 23, a right bearing box, 24 and a liquid outlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the embodiment includes a main shaft 3, an inlet end 9, a pump housing 19, a left bearing housing 4, and a right bearing housing 23; left side bearing box 4, link 6, import tip 9, pump housing 19 and right bearing box 23 connect gradually the shell structure who constitutes multistage spiral shell centrifugal pump, be equipped with tertiary coaxial coupling's rotor structure subassembly in the pump housing 19, tertiary rotor structure subassembly coaxial arrangement, left side bearing box 4 is passed in proper order to 3 one end of main shaft, link 6, import tip 9 back and pump housing 19 in first order rotor structure subassembly synchronous revolution ground connect, inlet 10 has been seted up to import tip 9, liquid gets into tertiary rotor structure subassembly through inlet 10, tertiary rotor structure subassembly stretches out right bearing box 23 and pumps out liquid. A felt ring 8 is installed between the main shaft 3 passing through the inlet end 9 and the inner wall of the inlet end 9 to seal.
Each stage of rotor structure component comprises a centrifugal impeller 13, a rotor cavity shell 18 and a collecting pipe 14, wherein the centrifugal impeller 13 and the collecting pipe 14 are installed in a cavity inside the rotor cavity shell 18.
The centrifugal impeller 13 is positioned in one side of the inner cavity of the rotor cavity shell 18 close to the upstream, the outer peripheral edge of the centrifugal impeller 13 is fixedly connected to the inner peripheral surface of the rotor cavity shell 18 through a plurality of strut members arranged at intervals along the circumference, the impeller 13 is formed by a plurality of blades arranged at intervals along the circumference, and gaps through which fluid passes are also formed between adjacent blades. The centrifugal impeller 13 is closer to the upstream inlet than the collecting pipe 14, one side of the inner cavity of the rotor cavity housing 18 close to the downstream is used as a rotor cavity 15, that is, the inner cavity of the rotor cavity housing 18 at the right part of the centrifugal impeller 13 shown in fig. 1 is used as the rotor cavity 15, and the fluid medium is driven to flow into the rotor cavity 15 by the rotation of the impeller 14.
The collecting pipe 14 is positioned in one side of the inner cavity of the rotor cavity shell 18 close to the downstream, the collecting pipe 14 comprises a shaft part, a diameter part and a bent part, the shaft part and the main shaft 3 are coaxially arranged, the diameter part is arranged along the direction perpendicular to the main shaft 3, the diameter part is arranged along one side perpendicular to the shaft part and from the end part of the shaft part in the radial direction, the inner end of the diameter part is connected to the side face of the middle part of the shaft part to form L shapes, the diameter part is completely positioned in the rotor cavity 15, the outer end of the diameter part is perpendicularly bent along the tangential direction of the circumference to form the bent part, the tangential direction of the bent part of the collecting pipe 14 is opposite to the tangential direction of the needle direction when the whole formed by the rotor cavity shell 18 and the impeller 13 rotates around the main shaft 3 and the shaft part of the collecting pipe 14, a through hollow channel is formed inside the shaft part, one end of the hollow channel penetrates through one end face of the collecting pipe 14 and the bent part, the other end of the hollow channel penetrates through the shaft part from the shaft part and the end of the shaft part and the bent part and penetrates out of the end of the collecting pipe to.
As shown in figure 1, the liquid inlet 10 is communicated with the annular inner cavity 11 to form a liquid inlet channel of L type, a gap is formed between the shaft part of the L type liquid inlet channel and the wall of the through hole of the rotor cavity shell 18 of the first-stage rotating structural component in the radial direction and the main shaft 3, the inlet liquid port L type channel is used as a channel of a fluid medium, a vertical channel and the annular inner cavity 11, and the surface is subjected to smoothing treatment and corrosion prevention treatment.
In the present invention, the upstream end surface of the rotor cavity shell 18 close to the main shaft 3 is the front end surface of the rotor cavity shell 18, and the downstream end surface of the rotor cavity shell 18 far from the main shaft 3 is the rear end surface of the rotor cavity shell 18.
The rotor cavity shells 18 of the three-stage rotor structure assemblies are coaxially and fixedly connected, the centers of the two horizontal end faces are respectively provided with a coaxial horizontal through hole, and the horizontal through holes of the rotor cavity shells 18 of the adjacent stage rotor structure assemblies are directly and coaxially communicated for the collecting pipe 14 to movably pass through; the horizontal through hole on the front end surface of the rotor cavity shell 18 of the first-stage rotor structural component is directly communicated with the annular inner cavity 11, and the main shaft 3 extends into the rotor cavity shell 18 of the first-stage rotor structural component from the horizontal through hole on the front end surface of the rotor cavity shell 18; the hole end surface of the through hole at the left end of the rotor cavity shell 18 of the first-stage rotating structural component is respectively connected with the end surface of the annular inner cavity in a sealing and rotating matching way through a filler, and the rotor cavity shells 18 of the first-stage, second-stage and third-stage rotating structural components are connected into a whole through bolts to rotate together.
The front end of the shaft part of the collecting pipe 14 of the first-stage rotor structure assembly is rotatably connected with the end part of the main shaft 3 through the rolling bearing 12, the rolling bearing 12 is installed at the joint and is positioned by a shaft shoulder, the rotation of the main shaft 3 is ensured, meanwhile, the clamping of the collecting pipe 14 is ensured, the axial fixation of the collecting pipe is kept, and the whole body is more compact. (ii) a The rear ends of the shaft parts of the collecting pipes 14 of the first-stage and second-stage rotor structure assemblies extend out of the horizontal through hole on the rear end face of the rotor cavity shell 18 of the first-stage and second-stage rotor structure assemblies, then extend into the rotor cavity shell 18 of the next-stage rotor structure assembly, and are coaxially connected with the front ends of the shaft parts of the collecting pipes 14 in the rotor cavity shell 18 of the next-stage rotor structure assembly; in this way, the shaft of the collecting main 14 and the main shaft 3 of the first-stage rotor assembly extend into the rotor chamber housing 18 of the first-stage rotor assembly from both sides of the rotor chamber housing 18.
The rear ends of the shaft parts of the collecting pipes 14 of the first-stage and second-stage rotor structure assemblies are provided with side wall through holes 16 in the vertical direction, and fluid in the collecting pipes 14 flows into a rotor cavity shell 18 of the next-stage rotor structure assembly through the side wall through holes 16; the rear end of the shaft part of the collecting pipe 14 of the third-stage rotor structure assembly extends out of the rotor cavity shell 18 and then extends out of the right bearing box 23, and a hollow pipeline port at the rear end of the shaft part of the collecting pipe 14 of the third-stage rotor structure assembly is used as a liquid outlet 24; the rear end of the shaft portion of the header 14 is directly connected to the liquid outlet 24. In this way, the liquid outlet 24 is directly connected with the shaft part of the collecting pipe 14 in the rotor cavity shell 18 of the third-stage rotating structure assembly into a whole, and the hollow pipe of the collecting pipe 14 is used as an outflow passage.
The rear end of the shaft part of the collecting pipe 14 of the third-stage rotor structural assembly extends out of the rotor cavity shell 18 and is movably sleeved with a hollow shaft 20 in a right bearing box 23 through a sliding bearing 21 and a thrust bearing 22, the sliding bearing 21 and the thrust bearing 22 are mounted on the hollow shaft 20, and the hollow shaft 20 is connected with the rotor cavity shell 18 of the third-stage rotor structural assembly through bolts.
A centrifugal impeller 13 of the first-stage rotor structure assembly is coaxially and fixedly sleeved on the main shaft 3 through a round-head flat key central inner hole, so that the main shaft is convenient to disassemble and assemble; a gap is arranged between the centrifugal impeller 13 and the wall of the horizontal through hole on the front end surface of the rotor cavity shell 18 of the first-stage rotor structural component, and the gap is communicated with the annular inner cavity 11; the centrifugal impellers 13 of the second-stage rotor structure assembly and the third-stage rotor structure assembly are rotatably connected and sleeved at the front ends of the shaft parts of the respective collecting pipes 14 through water-lubricated bearing shafts 17.
The rotor chamber housing 18 of the three-stage rotor structural assembly is integrally cast and installed in the pump casing 19 with a circumferential gap from the inner circumferential surface of the pump casing 19, so that the rotor chamber housing 18 of the three-stage rotor structural assembly and the respective centrifugal impeller 13 are integrally formed and rotate around the shaft portion of the main shaft 3 and the respective collecting pipe 14.
The suit is supported in left bearing box 4 through slide bearing 5 to 3 one ends of main shaft, be full of lubricating oil in the left bearing box 4, the other end of main shaft 3 is through shaft coupling 2 and motor 1's output shaft coaxial coupling, motor 1 drives main shaft 3 and rotates under slide bearing 5's support to lubricating oil through in the left bearing box 4 carries out the self-lubricating, lubricating oil lets main shaft 3 at the fine lubrication and the heat dissipation of rotatory in-process, let the bearing support better and rotate main shaft 3 simultaneously. The top of bearing box has been seted up the oiling through-hole, installs the oil plug of oil plug installation in the oiling through-hole, can make things convenient for the interpolation and the monitoring of lubricating oil more like this.
A connecting frame body 6 provided with a mechanical sealing device is arranged between the left bearing box 4 and the inlet end part 9, the mechanical sealing device is perpendicular to the main shaft 3 and is arranged along the radial direction, and the main shaft 3 can be ensured to rotate, and meanwhile, the leakage of fluid can be prevented. And the pressure between the main shaft 3 and the pump shell 19 is not high, and the felt ring 8 seal is selected instead of the mechanical seal selected by the common spiral shell centrifugal pump, so that the leakage of the fluid in operation is prevented, and the reliability of the seal is good.
The hollow shaft 20 is sleeved on the collecting pipe 14 of the third-level rotating structure assembly, a sliding bearing 21 and a thrust bearing 22 are installed on the inner ring of the hollow shaft 20, the hollow shaft 20 is movably sleeved with the collecting pipe 14 of the third-level rotating structure assembly in a matched mode through the sliding bearing 21 and the thrust bearing 22, and one end, close to the main shaft 3, of the hollow shaft 20 is fixedly connected with the rotor cavity shell 18 of the third-level rotating structure assembly through bolts; under the rotation of the main shaft 3, the hollow shaft 20 is driven to rotate together with the three-stage rotor cavity shell 18 and the centrifugal impeller 13 thereof, and is self-lubricated by lubricating oil in the right bearing box 23.
The shafts of the centrifugal impellers 13 in the rotor cavity 15 of the first-stage rotating structure assembly are coaxially sleeved and connected through round-head flat keys.
The rotor chamber housing 19 and the centrifugal impeller 13 in each stage of the rotating structural assembly are integrally cast. The main shaft 3 and the centrifugal impeller 13 in the rotor cavity 15 of the first-stage rotating structure assembly are connected together through keys, and the centrifugal impeller 13 and the whole rotor cavity shell 18 are integrated, so that the two are easier and more convenient to mount and dismount. The traditional centrifugal pump with the rotary shell is characterized in that a rotor cavity shell and a main shaft are connected into a whole through an impeller and a shell which are connected together through screws, so that the problem that the traditional centrifugal pump with the rotary shell cannot be conveniently disassembled and assembled is solved.
The flow passage between the main shaft 3 and the inlet end 9 and the rotor cavity shell 18 is sealed by means of packing to prevent leakage of the fluid medium; the gap between the collecting pipe 14 and the centrifugal impeller 13 of the second-stage rotating structure assembly is filled with water flow and is connected through a water lubrication bearing 17, so that the bearing can rotate better, and the collecting pipe 14 and the rotor cavity 15 can be sealed better.
A gap is formed between the centrifugal impeller 13 and the rotor cavity shell 18 at the front end face close to one end of the main shaft 3 and serves as an annular flow channel, a gap is formed between the hole wall of a through hole at the left end of the rotor cavity shell 18 of the first-stage rotating structure assembly and a through hole of an L-type flow channel shaft part of the inlet end face and the main shaft 3 and serves as an annular inner cavity 11, the rear end face of the centrifugal impeller 13 and the inner cavity part of the rotor cavity shell 8 serve as a rotor cavity 15, the outer ring part of the annular flow channel corresponding to the left end face of the centrifugal impeller 13 is communicated with the rotor cavity 15 through the gap between the peripheral edge of the centrifugal impeller 13 and the inner circumferential surface of the rotor cavity shell 8, the inner ring part of the annular flow channel corresponding to the left end face of the centrifugal impeller 13 is communicated with the hole wall of the through hole at the left end of the rotor cavity shell 18 and the annular inner cavity 11 and L-type flow channel.
The invention realizes the multi-stage of the centrifugal pump with the rotary shell by the combined action of the centrifugal impellers 13 and the collecting pipes 14 in the rotor cavities 15, increases the lift, and can realize the support and fixation of the left end and the right end by installing the sliding bearing 5 at one end of the main shaft 3 and installing the sliding bearing 21 and the thrust bearing 22 at one end of the hollow shaft 20, so that the original cantilever type is changed into the fixed type at two ends, and the low vibration of the multi-stage centrifugal pump with the rotary shell is realized.
In specific implementation, as shown in fig. 1, the working process of the present invention is as follows:
at first start motor 1, the output shaft of motor 1 links together through shaft coupling 2 and main shaft 3, and the other end of main shaft 3 stretches into left bearing box 6 in, installs slide bearing 5 in the left bearing box 6 and is used for suit main shaft 3, can rationally add lubricating oil to slide bearing 5 of left bearing box 6 through the oil plug of installing in the left bearing box 6, and main shaft 3 just can realize better rotation and self-lubricating under slide bearing 5 supporting role like this.
The motor 1 operates to drive the main shaft 3 to rotate, the main shaft 3 passes through the connecting frame 6 before entering the inlet end part 9, the mechanical seal 7 is installed in the connecting frame 6 to ensure the sealing performance of the main shaft 3 in the rotating process, the main shaft 3 after entering the inlet end part 9 passes through the annular inner cavity 11 and the annular flow passage and enters the rotor cavity shell 18 of the first-stage rotating structure assembly, the centrifugal impeller 13 of the first stage is connected with the main shaft 3 through a round head flat key, the centrifugal impeller 13 and the rotor cavity shell 18 are cast into a whole and are fixedly connected with the inner circumferential surface of the rotor cavity shell 18 through a plurality of support rod pieces arranged at intervals along the circumference, the rotor cavity shells 18 of the first-stage, the second-stage and the third-stage rotating structure assemblies are connected together through bolts, the hollow shaft 20 is sleeved on the periphery of the shaft part of the collecting pipe 14 of the third-stage rotating structure assembly, the hollow shaft 20 is connected with the rotor cavity, the main shaft 3, the tertiary rotor housing 18 with its impellers 13 and the hollow shaft 20 thus form a synchronously rotating whole.
In the rotating process of the first-stage, second-stage and third-stage rotor cavities 15 and the centrifugal impeller 13, fluid media enter the inner centrifugal impeller 13 of the rotor cavity shell 18 of the first-stage rotating structure assembly through the liquid inlet 10 through the L-shaped flow channel and the annular flow channel and rotate with the rotor cavity shell 18 to generate centrifugal force action, the fluid media in the rotor cavities 15 are driven to be thrown from the center of the rotor cavities 15 to the outer edge of the rotor cavities 15, the speed is increased, certain pressure is achieved, high speed energy is achieved, and the first-stage, second-stage and third-stage centrifugal impellers 13 are used for step-by-step pressurization, so that the maximum lift of the multistage centrifugal pump with the rotating shells is improved.
Because the bending tangential direction of the bending part at the tail end of the diameter part of the collecting pipe 14 is opposite to the rotating direction of the two centrifugal impellers 13 and the rotor cavity shell 18, the fluid which flows in a rotating way at the outer edge of the rotor cavity 15 enters the hollow channel inlet at the end face of the bending part of the collecting pipe 14 and then flows out from the hollow channel outlet at the end face of the shaft part of the collecting pipe 14. The fluid from the collecting main 14 of the first-stage rotating structural assembly flows out from the end of the shaft portion thereof provided with the sidewall through hole 16, enters the rotor cavity 15 of the second-stage rotating structural assembly, and finally flows out from the collecting main 14 in the rotor cavity 15 of the third-stage rotating structural assembly, wherein the collecting main 14 is directly connected with the liquid outlet 24 to form a whole.
Finally, because the fluid medium rotates in the rotor cavity 15 at a high speed and the rotor cavity shell 18 rotates at a high speed, the whole rotor cavity shell 18 has high kinetic energy, and a three-stage coaxially connected rotor structure component is also arranged, so that the vibration of the whole device is more severe certainly, and therefore, sliding bearings 5 and 21 are respectively arranged at one section of the main shaft 3 and one end of the hollow shaft 20 to play a role of supporting two ends, and meanwhile, a thrust bearing 22 is also arranged at one end of the hollow shaft 20 to effectively bear the thrust generated during rotation, so that the severe vibration of the rotor cavity shell 18 is effectively prevented, and the problem of vibration noise of the multistage centrifugal pump with the rotary shell exceeding low specific revolution is effectively solved.
Therefore, the multi-stage spiral shell centrifugal pump improves the efficiency of the conventional high-speed centrifugal pump, is reasonably optimized according to the structural characteristics of the multi-stage spiral shell centrifugal pump, improves the stability of the multi-stage spiral shell centrifugal pump at ultralow specific revolution through the sliding bearings supported at two ends and the thrust bearings which are stable in the axial direction, and prolongs the service life.
Claims (8)
1. The utility model provides a high-efficient multistage shell centrifugal pump that revolves of low discharge high-lift which characterized in that: comprises a main shaft (3), an inlet end part (9), a pump shell (19), a left bearing box (4) and a right bearing box (23); left side bearing box (4), link (6), import tip (9), pump housing (19) and right bearing box (23) connect gradually the shell structure who constitutes multistage spiral shell centrifugal pump, be equipped with tertiary coaxial coupling's rotor structure subassembly in pump housing (19), left side bearing box (4) are passed in proper order to main shaft (3) one end, link (6), connect with the synchronous revolution of the first order rotor structure subassembly in pump housing (19) behind import tip (9), inlet (10) have been seted up in import tip (9), liquid gets into tertiary rotor structure subassembly through inlet (10), tertiary rotor structure subassembly stretches out right bearing box (23) and pumps out liquid.
2. The small-flow high-lift high-efficiency multistage centrifugal pump of claim 1, characterized in that: a liquid inlet (10) is formed in the side wall of one side of the inlet end part (9), and an annular inner cavity (11) communicated with the liquid inlet (10) is formed in the periphery of the inlet end part (9) where the main shaft (3) passes through; each stage of rotor structure assembly comprises a centrifugal impeller (13), a rotor cavity shell (18) and a collecting pipe (14), wherein the centrifugal impeller (13) and the collecting pipe (14) are installed in a cavity inside the rotor cavity shell (18), the centrifugal impeller (13) is positioned in one side, close to the upstream, of an inner cavity of the rotor cavity shell (18), the outer peripheral edge of the centrifugal impeller (13) is fixedly connected to the inner peripheral surface of the rotor cavity shell (18), the collecting pipe (14) is positioned in one side, close to the downstream, of the inner cavity of the rotor cavity shell (18), one side, close to the downstream, of the inner cavity of the rotor cavity shell (18) serves as a rotor cavity (15), and fluid media are driven to flow into the rotor cavity (15) under the rotation of;
the collecting pipe (14) comprises a shaft part, a diameter part and a bent part, the shaft part and the main shaft (3) are coaxially arranged, the diameter part is arranged along the direction vertical to the main shaft (3), the inner end of the diameter part is connected to the side face of the middle part of the shaft part to form L shape, the outer end of the diameter part is perpendicularly bent along the tangential direction of the circumference to form the bent part, the tangential direction of the bent part of the collecting pipe (14) is opposite to the tangential direction of the needle direction when the whole formed by the rotor cavity shell (18) and the centrifugal impeller (13) rotates around the main shaft (3) and the shaft part of the collecting pipe (14), a through hollow channel is formed inside the shaft part, the diameter part and the bent part of the collecting pipe (14), one end of the hollow channel penetrates through the shaft part far away from the main shaft (3), the other end of the hollow channel is communicated with the bent part through the shaft part from the shaft part and penetrates through the tail end of the bent part to be communicated with the inner cavity of the rotor cavity shell (18);
a rotor cavity shell (18) of the three-stage rotor structure component is coaxially and fixedly connected, and the centers of two horizontal end faces are provided with horizontal through holes; the horizontal through hole on the front end surface of the rotor cavity shell (18) of the first-stage rotor structural component is directly communicated with the annular inner cavity (11), and the main shaft (3) extends into the rotor cavity shell (18) of the first-stage rotor structural component from the horizontal through hole on the front end surface of the rotor cavity shell (18);
the front end of the shaft part of a collecting pipe (14) of the first-stage rotor structure assembly is rotatably connected with the end part of the main shaft (3) through a rolling bearing (12); the rear ends of the shaft parts of the collecting pipes (14) of the first-stage and second-stage rotor structure assemblies extend out of the horizontal through hole on the rear end face of the rotor cavity shell (18) of the first-stage and second-stage rotor structure assemblies and then extend into the rotor cavity shell (18) of the next-stage rotor structure assembly, and are coaxially connected with the front ends of the shaft parts of the collecting pipes (14) in the rotor cavity shell (18) of the next-stage rotor structure assembly;
the rear ends of the shaft parts of the collecting pipes (14) of the first-stage and second-stage rotor structure assemblies are provided with side wall through holes (16) in the vertical direction, and fluid in the collecting pipes (14) flows into a rotor cavity shell (18) of the next-stage rotor structure assembly through the side wall through holes (16); the rear end of the shaft part of the collecting pipe (14) of the third-stage rotor structure assembly extends out of the rotor cavity shell (18) of the third-stage rotor structure assembly and then extends out of the right bearing box (23) through the shaft part, and a hollow pipeline port at the rear end of the shaft part of the collecting pipe (14) of the third-stage rotor structure assembly is used as a liquid outlet (24); the rear end of the shaft part of the collecting pipe (14) of the third-stage rotor structural assembly extends out of the rotor cavity shell (18) and is movably sleeved with a hollow shaft (20) in a right bearing box (23), and the hollow shaft (20) is connected with the rotor cavity shell (18) of the third-stage rotor structural assembly through bolts;
a central inner hole of a centrifugal impeller (13) of the first-stage rotor structural assembly is coaxially and fixedly sleeved on the main shaft (3), a gap is formed between the centrifugal impeller (13) and the wall of a horizontal through hole on the front end surface of a rotor cavity shell (18) of the first-stage rotor structural assembly, and the gap is communicated with the annular inner cavity (11); centrifugal impellers (13) of the second-stage rotor structure assembly and the third-stage rotor structure assembly are rotatably sleeved at the front ends of shaft parts of the collecting pipes (14) respectively through water lubrication bearing shafts (17); a circumferential gap is reserved between the rotor cavity shell (18) of the three-stage rotor structural assembly and the inner circumferential surface of the pump shell (19), so that the rotor cavity shell (18) of the three-stage rotor structural assembly and the respective impeller (13) are integrally formed and rotate around the shaft part of the main shaft (3) and the shaft part of the respective collecting pipe (14).
3. The small-flow high-lift high-efficiency multistage centrifugal pump of claim 2, characterized in that: the bearing box is characterized in that one end of the main shaft (3) is supported and sleeved in the left bearing box (4) through the sliding bearing (5), the left bearing box (4) is filled with lubricating oil, the other end of the main shaft (3) is coaxially connected with an output shaft of the motor (1) through the coupler (2), and the motor (1) drives the main shaft (3) to rotate under the support of the sliding bearing (5) and self-lubricate through the lubricating oil in the left bearing box (4).
4. The small-flow high-lift high-efficiency multistage centrifugal pump of claim 2, characterized in that: the centrifugal impeller (13) is formed by a plurality of blades which are arranged at intervals along the circumference, and gaps through which fluid passes are formed between adjacent blades.
5. The small-flow high-lift high-efficiency multistage centrifugal pump of claim 2, characterized in that: the hollow shaft (20) is sleeved on a collecting pipe (14) of the third-level rotating structure assembly, a sliding bearing (21) and a thrust bearing (22) are installed on the inner ring of the hollow shaft (20), the hollow shaft (20) is movably sleeved with the collecting pipe (14) of the third-level rotating structure assembly in a matched mode through the sliding bearing (21) and the thrust bearing (22), and one end, close to the main shaft (3), of the hollow shaft (20) is fixedly connected with a rotor cavity shell (18) of the third-level rotating structure assembly through a bolt.
6. The small-flow high-lift high-efficiency multistage centrifugal pump of claim 2, characterized in that: and a felt ring (8) is arranged between the main shaft (3) and the inner wall of the inlet end part (9) when the main shaft penetrates through the inlet end part (9) for sealing.
7. The small-flow high-lift high-efficiency multistage centrifugal pump of claim 2, characterized in that: the rotor cavity shell (19) and the centrifugal impeller (13) in each stage of rotating structure assembly are integrally cast.
8. Use of a multistage centrifugal pump of any one of claims 1 to 7, characterized in that: the method is applied to fluid conveying in the fields of petrochemical industry, papermaking, food and the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010448336.XA CN111503003A (en) | 2020-05-25 | 2020-05-25 | Small-flow high-lift efficient multi-stage rotary shell centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010448336.XA CN111503003A (en) | 2020-05-25 | 2020-05-25 | Small-flow high-lift efficient multi-stage rotary shell centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111503003A true CN111503003A (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010448336.XA Pending CN111503003A (en) | 2020-05-25 | 2020-05-25 | Small-flow high-lift efficient multi-stage rotary shell centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111503003A (en) |
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2020
- 2020-05-25 CN CN202010448336.XA patent/CN111503003A/en active Pending
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