CN110966207A - Complete balance energy-saving multistage centrifugal pump - Google Patents

Complete balance energy-saving multistage centrifugal pump Download PDF

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Publication number
CN110966207A
CN110966207A CN201911419084.1A CN201911419084A CN110966207A CN 110966207 A CN110966207 A CN 110966207A CN 201911419084 A CN201911419084 A CN 201911419084A CN 110966207 A CN110966207 A CN 110966207A
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CN
China
Prior art keywords
impeller
sleeve
balance plate
flow path
balance
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CN201911419084.1A
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Chinese (zh)
Inventor
郭学文
吉效科
鱼岗
马江锋
杨宣
鲁鹏举
周志伟
王全坤
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Individual
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Individual
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Priority to CN201911419084.1A priority Critical patent/CN110966207A/en
Publication of CN110966207A publication Critical patent/CN110966207A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06Multi-stage pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/106Shaft sealings especially adapted for liquid pumps
    • F04D29/108Shaft sealings especially adapted for liquid pumps the sealing fluid being other than the working liquid or being the working liquid treated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Abstract

The invention relates to a complete balance energy-saving multistage centrifugal pump, comprising: a housing and a rotor, the rotor comprising a main shaft, a roller bearing, a bearing spacer, a left shaft sleeve, an impeller spacer, a forward flow path first-stage impeller, a left impeller bushing, a forward flow path impeller, a complete balance system, a reverse flow path impeller, a right impeller bushing, a reverse flow path first-stage impeller, a labyrinth pressure reducing sleeve, a right shaft sleeve, a ball bearing, the roller bearing, the bearing spacer, the left shaft sleeve, the impeller spacer, the forward flow path first-stage impeller, the left impeller bushing, the forward flow path impeller, the complete balance system, the reverse flow path impeller, the right impeller bushing, the reverse flow path first-stage impeller, the labyrinth pressure reducing sleeve, the right shaft sleeve, and the ball bearing are sequentially mounted on the main shaft, the impeller spacer is mounted between the shaft sleeve and the forward flow path first-stage impeller, the left impeller bushing is mounted between two adjacent forward flow path impellers, the right impeller bushing is mounted between two adjacent reverse flow path impellers, the complete balance system is mounted between the forward flow path last-stage impeller and the reverse, the labyrinth pressure reducing sleeve is adjacent to the first-stage impeller of the reverse flow passage, and the first-stage impeller of the reverse flow passage is adjacent to the guide vane of the reverse flow passage.

Description

Complete balance energy-saving multistage centrifugal pump
Technical Field
The invention relates to the field of hydraulic machinery, in particular to a fully-balanced energy-saving multistage centrifugal pump.
Background
Generally speaking, in a multistage centrifugal pump with two sets of impellers arranged in a forward-backward symmetric manner, the water flow direction of the multistage centrifugal pump flows from the last stage of the first set of impellers through a flow guide pipe into the first stage of the second set of impellers, and then is discharged from the last stage of the second set of impellers through an intermediate water outlet section. However, there is no balancing system between the two sets of impellers and the axial forces are not fully balanced. The pressure difference of one time of total pressure exists between two groups of positive and negative symmetrical impeller groups of the pump, the axial force cannot be completely balanced, the residual axial force is always born by the bearing, and the residual unbalanced force is increased along with the increase of the impeller stage number of the centrifugal pump, so that the mechanical failure is aggravated.
In addition, when the inlet pressure of the centrifugal pump is relatively high, the packing seal is difficult to seal, the use effect of the mechanical seal is poor, and the service life is short. When the existing centrifugal pump works, the shaft seal generally adopts the technologies of direct sealing, thread auxiliary sealing, thread labyrinth sealing and the like, the auxiliary sealing only can slightly reduce the pressure and hardly meets the requirement of the sealing pressure which can be borne by equipment, and the auxiliary sealing can completely fail once the sealing gap of the equipment is abraded along with the operation of the equipment.
Disclosure of Invention
In order to solve the problems of failure of the multistage centrifugal pump caused by unbalanced axial force, sealing failure caused by high inlet pressure and the like, the invention provides a fully-balanced energy-saving multistage centrifugal pump.
The specific technical scheme is as follows:
a fully balanced, energy efficient multistage centrifugal pump comprising: a housing and a rotor, the rotor comprising a main shaft, a roller bearing, a bearing spacer, a left shaft sleeve, an impeller spacer, a forward flow path first-stage impeller, a left impeller bushing, a forward flow path impeller, a complete balance system, a reverse flow path impeller, a right impeller bushing, a reverse flow path first-stage impeller, a labyrinth pressure reducing sleeve, a right shaft sleeve, a ball bearing, the roller bearing, the bearing spacer, the left shaft sleeve, the impeller spacer, the forward flow path first-stage impeller, the left impeller bushing, the forward flow path impeller, the complete balance system, the reverse flow path impeller, the right impeller bushing, the reverse flow path first-stage impeller, the labyrinth pressure reducing sleeve, the right shaft sleeve, and the ball bearing are sequentially mounted on the main shaft, the impeller spacer is mounted between the shaft sleeve and the forward flow path first-stage impeller, the left impeller bushing is mounted between two adjacent forward flow path impellers, the right impeller bushing is mounted between two adjacent reverse flow path impellers, the complete balance system is mounted between the forward flow path last-stage impeller and the reverse, the labyrinth pressure reducing sleeve is adjacent to the first-stage impeller of the reverse flow passage, and the first-stage impeller of the reverse flow passage is adjacent to the guide vane of the reverse flow passage.
Further, the shell includes bearing body assembly A, water inlet section A, the middle section, positive runner stator, positive runner last stage stator, go out the water section, water inlet section B, backward runner stator, backward runner last stage stator, bearing body assembly B, the transition pipe, sealed water pipe, supplementary decompression seal assembly and fixing device, positive runner stator and backward runner stator dress are on the middle section, positive runner last stage stator and backward runner last stage stator dress are on going out the water section, supplementary decompression seal assembly is fixed in water inlet section B, fixing device will go into water section A, the middle section, go out water section and water section B and fix together. Liquid flows in from the inlet of the left water inlet section A, is guided into the next stage positive flow channel impeller through the positive flow channel guide vane after acting through the first stage positive flow channel impeller, and finally enters the last stage positive flow channel impeller, and formed high-pressure liquid enters the water inlet section B through the transition pipe. Liquid enters the first-stage impeller of the reverse flow channel from the water inlet section B to do work, then enters the guide vane of the reverse flow channel, is guided into the next-stage impeller of the reverse flow channel, and high-pressure liquid finally flows through the last-stage guide vane of the reverse flow channel and finally enters the water outlet section to be discharged.
Further, the fixing device is a tension bolt.
Further, the fully balanced system includes: a left balance plate outer sleeve, a left O-shaped ring, a right O-shaped ring, a fastening screw, a flat key, a left balance plate sleeve, a right balance plate sleeve, a left balance plate outer sleeve, a right balance plate outer sleeve, a left balance sleeve, a pressure balance seat, a water lubrication bush, a water lubrication shaft sleeve and a right balance sleeve, the left primary balance face is arranged between a left balance plate outer sleeve and a forward flow channel impeller, the right tertiary balance face is arranged between a right balance plate outer sleeve and a reverse flow channel impeller, the left balance plate outer sleeve and the right balance plate outer sleeve are fixed on the left balance plate outer sleeve and the right balance plate outer sleeve respectively through fastening screws, a left O-shaped ring is arranged between the left balance plate outer sleeve and the left balance plate outer sleeve, a right O-shaped ring is arranged between the right balance plate outer sleeve and the right balance plate outer sleeve, the left balance sleeve, a pressure balance seat and the right balance sleeve are respectively installed on a water outlet section, a water lubrication bushing is arranged on the pressure balance seat, a water lubrication bushing is arranged between the left balance plate sleeve and the right balance plate sleeve, and the left balance plate sleeve, the right balance plate sleeve and the water lubrication bushing.
Furthermore, the small-head outer diameters of the left and right balance plate sleeves and the inner hole of the pressure balance seat are provided with a movement gap, and the outer diameter of the balance plate sleeve is provided with a labyrinth groove.
Further, the outer sleeve of the balance plate and the inner diameter of the balance sleeve are provided with a movement gap.
Furthermore, two ends of the left and right balance plate sleeves which are symmetrically arranged are respectively provided with a positive flow passage impeller and a reverse flow passage impeller.
Furthermore, the left and right balance plate sleeves, the left and right balance plate outer sleeves and the water lubricating shaft sleeve are integrally arranged on the main shaft 1 and can rotate.
Further, the auxiliary pressure relief seal assembly includes: stator part and rotating part, the stator part includes: seal box, sealed letter body, labyrinth decompression bush, bearing body second, sealed water pipe, seal box, sealed letter body dress is on the pump body or pump cover, sealed letter body passes through the second fixing bolt to be fixed on the pump body or pump cover, seal box fixes on sealed letter body through first fixing bolt, labyrinth decompression bush is axial motion between sealed letter body and seal box through first adjusting bolt and second adjusting bolt, axial clearance has between labyrinth decompression bush and the labyrinth decompression axle sleeve.
Furthermore, the rotating part comprises a labyrinth decompression shaft sleeve, a main shaft and a flat key, wherein the labyrinth decompression shaft sleeve and the shaft sleeve are arranged on the main shaft through the flat key.
Furthermore, a packing gland or a mechanical sealing gland and a packing ring are arranged in the sealing box, the packing gland or the mechanical sealing gland is used for sealing liquid in the sealing box, and the packing ring is used when the shaft seal is soft packing.
Furthermore, one end of the sealing water pipe is connected with a water inlet of the centrifugal pump, and the other end of the sealing water pipe penetrates through the sealing box body to enter the sealing box.
Furthermore, a gap is formed between a high-pressure cavity of the centrifugal pump and the sealing box body, and high-pressure water in the high-pressure cavity enters the sealing box body.
The invention has the beneficial technical effects that:
1. by adding the complete balance system, the axial force of the pump can be completely balanced, the failure rate of the centrifugal pump is greatly reduced, the maintenance period of the centrifugal pump is prolonged, and the service life of the centrifugal pump is prolonged
2. The pressure relief pipe is eliminated, the leakage amount is reduced, the volume loss of the centrifugal pump is reduced, and the working efficiency of the centrifugal pump is improved.
3. Through the depressurization treatment, the problems that the shaft seal is easy to lose efficacy, the mechanical seal is easy to damage and the like due to the large inlet pressure of the centrifugal pump can be thoroughly solved. The maintenance workload of the centrifugal pump is reduced, and the labor intensity of workers is reduced.
4. The centrifugal pump is not easy to leak, and the problem of environmental pollution is reduced.
Drawings
FIG. 1 is a schematic diagram of the construction of a fully balanced, energy efficient multi-stage centrifugal pump of the present invention;
FIG. 2 is a schematic structural view of the auxiliary pressure relief seal assembly of the centrifugal pump of the present invention;
fig. 3 is a schematic structural view of the centrifugal pump complete balancing system of the present invention.
Reference numerals:
FIG. 1: the main shaft 1, the roller bearing 2, the bearing retaining sleeve 3, the shaft sleeve 4, the impeller retaining sleeve 5, the forward flow channel first-stage impeller 6, the impeller bush 7, the forward flow channel impeller 8, the complete balance system 9, the ball bearing 10, the labyrinth pressure reducing sleeve 11, the reverse flow channel first-stage impeller 12, the reverse flow channel impeller 13, the bearing body assembly A14, the water inlet section A15, the middle section 16, the forward flow channel guide vane 17, the forward flow channel last-stage guide vane 18, the guide vane sleeve 19, the first-stage sealing ring 20, the sealing ring 21, the transition pipe 22, the sealing water pipe 23, the bearing body assembly B24, the packing gland 25, the auxiliary pressure reducing sealing assembly 26, the water inlet section B27, the reverse flow channel 28, the reverse flow channel guide vane 29, the tensioning bolt 30, the water outlet section 31, the secondary balance cavity 32 and the quartic balance;
FIG. 2: the device comprises a shaft sleeve 2601, a packing or mechanical seal 2602, an adjusting bolt 2603, a packing ring 2604, a seal box 2605, a labyrinth pressure reducing bushing 2606, a seal box body 2607, a labyrinth pressure reducing shaft sleeve 2608, a main shaft 1, a packing gland 2610, a flat key 2611, an adjusting bolt 2612, a fixing bolt 2613, a fixing bolt 2614, a sealing water pipe 23, a water inlet section B27, a reverse flow passage guide vane 28, a reverse flow passage impeller 13, an impeller bushing 7, a reverse flow passage first-stage impeller 12, a high pressure cavity 2622 and a bearing body B2623;
FIG. 3: the balance plate comprises a balance plate sleeve 901, a balance plate outer sleeve 902, a balance sleeve 903, a water inlet section 904, a pressure balance seat 905, a water lubrication bushing 906, a fastening screw 907, a water lubrication shaft sleeve 908, a right balance sleeve 909, flat keys 910 and 911, a fastening screw 912, an O-shaped ring 913, a reverse flow channel impeller 13, a middle section 16, a positive flow channel final stage guide vane 18, a water outlet section 31, a secondary balance cavity 32 and a quartic balance cavity 33.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to fig. 1 to 3.
As can be seen from fig. 1, the present invention provides a fully balanced, energy efficient multistage centrifugal pump comprising: a shell and a rotor, the rotor comprises a main shaft 1, a roller bearing 2, a bearing baffle sleeve 3, a left shaft sleeve 4, an impeller baffle sleeve 5, a positive runner first-stage impeller 6, a left impeller bush 7, a positive runner impeller 8, a complete balance system 9, a reverse runner impeller 13, a right impeller bush 7, a reverse runner first-stage impeller 12, a labyrinth decompression sleeve 11, a right shaft sleeve 4 and a ball bearing 10, the roller bearing 2, the bearing baffle sleeve 3, the left shaft sleeve 4, the impeller baffle sleeve 5, the positive runner first-stage impeller 6, the left impeller bush 7, the positive runner impeller 8, the complete balance system 9, the reverse runner impeller 13, the right impeller bush 7, the reverse runner first-stage impeller 12, the labyrinth decompression sleeve 11, the right shaft sleeve 4 and the ball bearing 10 are sequentially installed on the main shaft 1, the impeller baffle sleeve 5 is installed between the shaft sleeve 4 and the positive runner first-stage impeller 6, the left impeller bush 7 is installed between two adjacent positive runner impellers 8, the right impeller bush 7 is installed between two adjacent reverse flow channel impellers 13, the complete balance system 9 is installed between a positive flow channel final stage impeller and a reverse flow channel final stage impeller, the labyrinth pressure reducing sleeve 11 is adjacent to a reverse flow channel first stage impeller 12, and the reverse flow channel first stage impeller 12 is adjacent to a reverse flow channel guide vane 28.
Further, the shell includes bearing body assembly first 14, water inlet section first 15, middle section 16, positive runner stator 17, positive runner last stage stator 18, go out water section 31, water inlet section second 27, reverse runner stator 28, reverse runner last stage stator 29, bearing body assembly second 24, transition pipe 22, sealed water pipe 23, supplementary decompression seal assembly 26 and fixing device, positive runner stator 17 and reverse runner stator 28 are adorned on middle section 16, positive runner last stage stator 18 and reverse runner last stage stator 29 are adorned on water outlet section 31, supplementary decompression seal assembly 26 is fixed in water inlet section second 27, fixing device fixes water inlet section first 15, middle section 16, water outlet section 31 and water inlet section second 27 together. Liquid flows in from the inlet of the left water inlet section A15, is guided into the next stage positive runner impeller 8 through the positive runner guide vane 17 after acting through the positive runner first stage impeller 6, and finally enters the positive runner last stage impeller 18, and formed high-pressure liquid enters the water inlet section B27 through the transition pipe 22. The liquid enters the first-stage impeller 12 of the reverse flow channel from the water inlet section B27 to do work, then enters the guide vane 28 of the reverse flow channel, is guided into the next-stage reverse flow channel impeller 13, and finally flows through the last-stage guide vane 29 of the reverse flow channel, and finally enters the water outlet section 31 to be discharged.
Further, the fixing means is a tension bolt 30.
Further, the fully balanced system includes: the left and right balance plate outer sleeves 902, the left and right O-rings 913, the fastening screws 912, the flat keys 910, 911, the left and right balance plate outer sleeves 901, the left balance sleeve 903, the pressure balance seat 905, the water lubrication bush 906, the water lubrication shaft sleeve 908 and the right balance sleeve 909, wherein a left primary balance surface is arranged between the left balance plate outer sleeve 902 and the positive runner impeller, a right primary balance surface is arranged between the right balance plate outer sleeve 902 and the reverse runner impeller, the left and right balance plate outer sleeves 902 are respectively fixed on the left and right balance plate outer sleeves 901 by the fastening screws, the left O-ring 913 is arranged between the left balance plate outer sleeve 901 and the left balance plate outer sleeve 902, the right O-ring 913 is arranged between the right balance plate outer sleeve 901 and the right balance plate outer sleeve 902, the left balance sleeve 903, the pressure balance seat 905 and the right balance sleeve 909 are respectively arranged on the water outlet section 31, the water lubrication bush 906 is arranged on the pressure balance seat 905, the water lubrication shaft sleeve 908 is arranged between the left and right balance plate outer sleeve, the left and right balance plate sleeves 901 and the water lubrication shaft sleeve 908 are fixed on the main shaft 1 through flat keys 911 and 910.
Furthermore, the small-end outer diameter of the left and right balance plate sleeves 901 and the inner hole of the pressure balance seat 905 have a movement clearance, and the outer diameter of the balance plate outer sleeve 902 has a labyrinth groove.
Further, the balance plate outer sleeve 902 and the balance sleeve 903 have a movement clearance inside.
Further, two ends of the two symmetrically arranged left and right balance plate sleeves 901 are respectively provided with a positive flow passage impeller 8 and a reverse flow passage impeller 13.
Further, the left and right balance plate sleeves 901, the left and right balance plate outer sleeves 902, and the water lubrication bushing 908 are integrally mounted on the main shaft 1 to be rotatable.
Further, the auxiliary decompression sealing assembly 26 includes: stator part and rotating part, the stator part includes: the labyrinth decompression structure comprises a seal box 2605, a seal box body 2607, a labyrinth decompression bush 2606, a bearing body B2623 and a seal water pipe 23, wherein the seal box 2605 and the seal box body 2607 are installed on a pump body or a pump cover, the seal box body 2607 is fixed on the pump body or the pump cover through a second fixing bolt 2614, the seal box 2605 is fixed on the seal box body 2607 through a first fixing bolt 2613, the labyrinth decompression bush 2606 axially moves between the seal box 2607 and the seal box 2605 through a first adjusting bolt 2603 and a second adjusting bolt 2612, and an axial gap is reserved between the labyrinth decompression bush 2606 and the labyrinth decompression shaft sleeve 2608.
Further, the rotating portion includes a labyrinth decompression sleeve 2608, a sleeve 2601, a main shaft 1, and a flat key 2611, and the labyrinth decompression sleeve 2608 and the sleeve 2601 are mounted on the main shaft 1 through the flat key 2611.
Further, a packing gland 2610 or a mechanical sealing gland and a packing ring 2604 are installed in the seal box 2605, the packing gland 2610 or the mechanical sealing gland is used for sealing liquid in the seal box 2605, and the packing ring 2604 is used when the shaft seal is soft packing.
Further, one end of the sealing water pipe is connected with the water inlet of the centrifugal pump, and the other end of the sealing water pipe penetrates through the sealing box body 2607 and enters the sealing box 2605.
Further, a gap is formed between the high-pressure cavity 2622 of the centrifugal pump and the sealing box body 2607, and high-pressure water in the high-pressure cavity 2622 enters the sealing box body 2607.
The basic principle of the centrifugal pump for realizing complete balance of axial force is as follows: the unbalanced axial force generated in the positive runner impeller guide vane group can move towards the left, the high-pressure water can push against a complete balance system 9 on the rotor component to slightly move towards the right, the movement clearance between the inner hole end surface of the pressure balance seat 905 and the inner end surface of the balance plate sleeve 901 is reduced, the high-pressure water can enter a secondary balance cavity along the outer circle of the balance plate sleeve 902 and the inner circle of the balance sleeve 903, when the pressure of the secondary balance cavity is built, the rotor component can be pushed against to slightly move towards the left, the movement clearance between the inner hole end surface of the pressure balance seat 905 and the inner end surface of the balance plate sleeve 901 is increased, the unbalanced pressure is released, and therefore the axial force of the positive runner impeller guide vane group.
The unbalanced axial force that produces in the backward flow way impeller guide vane group can be moved to the right side, the complete balanced system 9 that the water under high pressure can push up in the rotor part is moved the fine motion to the right side, the hole terminal surface in pressure balance seat 905 and the terminal surface motion clearance in balanced plate cover 901 reduce, the water under high pressure can be along balanced plate cover 902 excircle and balanced cover 903 interior circle entering secondary balance chamber, after secondary balance chamber pressure is established, can push up the rotor part and move the fine motion to the left side, the hole terminal surface in pressure balance seat 905 and the terminal surface motion clearance increase in balanced plate cover 901, release unbalanced pressure, thereby the axial force basic balance to the backward flow way impeller guide vane group has been realized.
The liquid with the pressure released from the two ends can enter the movement gap between the inner diameter of the pressure balance seat 905 and the outer diameter of the small end of the balance plate sleeve 901, and because the pressure generated by the reverse flow passage impeller guide vane group is greater than the pressure generated by the forward flow passage impeller guide vane group, the liquid in the movement gap between the inner diameter of the pressure balance seat 905 and the outer diameter of the small end of the balance plate sleeve 901 can be pressed into the secondary balance cavity close to the end of the forward flow passage impeller guide vane group, so that the movement gap between the end surface of the inner diameter of the pressure balance seat 905 and the balance plate sleeve 901 of the reverse flow passage impeller guide vane group is reduced, meanwhile, the pressure in the secondary balance cavity close to the end is equal to the secondary balance cavity of the forward flow passage impeller guide vane group, and finally the axial force.
The working principle of the auxiliary decompression sealing assembly of the centrifugal pump is as follows: taking the fluid delivered by the centrifugal pump as water as an example, as can be seen from fig. 1-2, after entering the water inlet section b 2616, the high-pressure water enters the first-stage impeller 12 of the reverse flow passage and flows out through the guide vane 28 of the reverse flow passage until being discharged out of the pump. Due to the pressure action, liquid in a high-pressure cavity 2622 formed by the water inlet section B27 enters the sealing box 2605 through a gap between the labyrinth pressure reducing shaft sleeve 2608 and the labyrinth pressure reducing bushing 2606 along the gap between the labyrinth pressure reducing shaft sleeve 2608 and the water inlet section B27, and the water after pressure reduction by the sealing box 2605 finally flows back to the water inlet section A15 of the centrifugal pump through the sealing water pipe 23 to form a circulation. When the pressure of the seal box 2605 is too high, the labyrinth decompression bush 2606 is driven to move left by the first adjusting bolt 2603 and the second adjusting bolt 2612, so as to reduce the gap between the labyrinth decompression shaft sleeve 2608 and the labyrinth decompression bush 2606, thereby reducing the water amount entering the seal box 2605, achieving the decompression effect and ensuring that the water in the seal box 2605 is in a normal pressure state.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a complete energy-conserving multistage centrifugal pump which characterized in that: the method comprises the following steps: a housing and a rotor, the rotor comprising a main shaft, a roller bearing, a bearing spacer, a left shaft sleeve, an impeller spacer, a forward flow path first-stage impeller, a left impeller bushing, a forward flow path impeller, a complete balance system, a reverse flow path impeller, a right impeller bushing, a reverse flow path first-stage impeller, a labyrinth pressure reducing sleeve, a right shaft sleeve, a ball bearing, the roller bearing, the bearing spacer, the left shaft sleeve, the impeller spacer, the forward flow path first-stage impeller, the left impeller bushing, the forward flow path impeller, the complete balance system, the reverse flow path impeller, the right impeller bushing, the reverse flow path first-stage impeller, the labyrinth pressure reducing sleeve, the right shaft sleeve, and the ball bearing are sequentially mounted on the main shaft, the impeller spacer is mounted between the shaft sleeve and the forward flow path first-stage impeller, the left impeller bushing is mounted between two adjacent forward flow path impellers, the right impeller bushing is mounted between two adjacent reverse flow path impellers, the complete balance system is mounted between the forward flow path last-stage impeller and the reverse, the labyrinth pressure reducing sleeve is adjacent to the first-stage impeller of the reverse flow passage, and the first-stage impeller of the reverse flow passage is adjacent to the guide vane of the reverse flow passage.
2. A fully balanced, energy efficient multistage centrifugal pump according to claim 1, characterized in that: the shell includes bearing body assembly first, the section of intaking first, the middle section, positive runner stator, positive runner last stage stator, go out the water section, the section of intaking second, the counter current way stator, counter current way last stage stator, bearing body assembly second, the transition pipe, sealed water pipe, supplementary decompression seal assembly and fixing device, positive runner stator and counter current way stator dress are on the middle section, positive runner last stage stator and counter current way last stage stator dress are on going out the water section, supplementary decompression seal assembly is fixed in the section of intaking second, fixing device is with the section of intaking first, the middle section, go out the water section and intake section second and fix together.
3. A fully balanced, energy efficient multistage centrifugal pump according to claim 1, characterized in that: the fixing device is a tension bolt.
4. A fully balanced, energy efficient multistage centrifugal pump according to claim 1 or 2 or 3, characterized in that: the complete balancing system comprises: a left balance plate outer sleeve, a left O-shaped ring, a right O-shaped ring, a fastening screw, a flat key, a left balance plate sleeve, a right balance plate sleeve, a left balance plate outer sleeve, a right balance plate outer sleeve, a left balance sleeve, a pressure balance seat, a water lubrication bush, a water lubrication shaft sleeve and a right balance sleeve, the left primary balance face is arranged between a left balance plate outer sleeve and a forward flow channel impeller, the right primary balance face is arranged between a right balance plate outer sleeve and a reverse flow channel impeller, the left balance plate outer sleeve and the right balance plate outer sleeve are fixed on the left balance plate outer sleeve and the right balance plate outer sleeve respectively through fastening screws, a left O-shaped ring is arranged between the left balance plate outer sleeve and the left balance plate outer sleeve, a right O-shaped ring is arranged between the right balance plate outer sleeve and the right balance plate outer sleeve, the left balance sleeve, a pressure balance seat and the right balance sleeve are respectively installed on a water outlet section, a water lubrication bushing is arranged on the pressure balance seat, a water lubrication bushing is arranged between the left balance plate sleeve and the right balance plate sleeve, and the left balance plate sleeve, the right balance plate sleeve and the water lubrication bushing.
5. A fully balanced, energy efficient multistage centrifugal pump according to claim 4, characterized in that: the small-head outer diameter of the left and right balance plate sleeves and the inner hole of the pressure balance seat are provided with movement gaps, and the outer diameter of the balance plate sleeve is provided with a labyrinth groove.
6. A fully balanced, energy efficient multistage centrifugal pump according to claim 4 or 5, characterized in that: the balance plate outer sleeve and the inner diameter of the balance sleeve are provided with a movement gap.
7. A fully balanced, energy efficient multistage centrifugal pump according to claim 4 or 5, characterized in that: two ends of the left and right balance plate sleeves which are symmetrically arranged are respectively provided with a positive flow passage impeller and a negative flow passage impeller, and the left and right balance plate sleeves, the left and right balance plate sleeves and the water lubricating shaft sleeve are integrally arranged on the main shaft and can rotate.
8. A fully balanced, energy efficient multistage centrifugal pump according to claim 1 or 2 or 3, characterized in that: the supplementary decompression seals the assembly and includes: stator part and rotating part, the stator part includes: seal box, sealed letter body, labyrinth decompression bush, bearing body second, sealed water pipe, seal box, sealed letter body dress is on the pump body or pump cover, sealed letter body passes through the second fixing bolt to be fixed on the pump body or pump cover, seal box fixes on sealed letter body through first fixing bolt, labyrinth decompression bush is axial motion between sealed letter body and seal box through first adjusting bolt and second adjusting bolt, axial clearance has between labyrinth decompression bush and the labyrinth decompression axle sleeve.
9. A fully balanced, energy efficient multistage centrifugal pump according to claim 8, characterized in that: the rotating part comprises a labyrinth pressure reducing shaft sleeve, a main shaft and a flat key, wherein the labyrinth pressure reducing shaft sleeve and the shaft sleeve are arranged on the main shaft through the flat key.
10. A fully balanced, energy efficient multistage centrifugal pump according to claim 8, characterized in that: the packing gland or the mechanical sealing gland and the packing ring are arranged in the sealing box, the packing gland or the mechanical sealing gland is used for sealing liquid in the sealing box, and the packing ring is used when the shaft seal is soft packing.
CN201911419084.1A 2019-12-31 2019-12-31 Complete balance energy-saving multistage centrifugal pump Pending CN110966207A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893436A (en) * 2022-06-13 2022-08-12 江苏亚梅泵业集团有限公司 Self-balancing multistage pump shaft seal mechanical seal structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893436A (en) * 2022-06-13 2022-08-12 江苏亚梅泵业集团有限公司 Self-balancing multistage pump shaft seal mechanical seal structure

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