CN112412807A - Double-suction volute core-pulling type long-shaft pump - Google Patents

Double-suction volute core-pulling type long-shaft pump Download PDF

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Publication number
CN112412807A
CN112412807A CN201910770258.2A CN201910770258A CN112412807A CN 112412807 A CN112412807 A CN 112412807A CN 201910770258 A CN201910770258 A CN 201910770258A CN 112412807 A CN112412807 A CN 112412807A
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CN
China
Prior art keywords
shaft
impeller
double
pump
volute
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Pending
Application number
CN201910770258.2A
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Chinese (zh)
Inventor
张培富
秦勇
周跃
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Shanghai Liancheng Group Co Ltd
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Shanghai Liancheng Group Co Ltd
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Priority to CN201910770258.2A priority Critical patent/CN112412807A/en
Publication of CN112412807A publication Critical patent/CN112412807A/en
Pending legal-status Critical Current

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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
    • F04D1/006—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps double suction pumps
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • 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
    • 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
    • F04D29/043—Shafts
    • 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
    • F04D29/043—Shafts
    • F04D29/044—Arrangements for joining or assembling shafts
    • 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
    • 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
    • F04D29/086—Sealings especially adapted for liquid pumps
    • 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
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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

Abstract

The invention discloses a double-suction volute core-pulling type long-shaft pump, which comprises a double-flow-channel volute and is of a centrosymmetric structure; the double-suction impeller is positioned in the double-channel volute; the double-suction impeller is fixed at the lower end of the impeller shaft and rotates along with the impeller shaft; the double-suction impeller is fixedly connected with the impeller shaft and rotates relative to the double-flow-channel volute through the water guide bearing; the transmission shaft is coaxially arranged with the impeller shaft and is arranged above the impeller shaft; the impeller shaft and the transmission shaft are connected into a whole through the coupler, and the coupler is a sleeve coupler; the upper end of the transmission shaft is fixedly connected with the core-pulling component, and the core-pulling component is detachably and fixedly connected with the base. The invention pursues high efficiency and focuses on the wide high-efficiency area, so that the pump is in a high-efficiency state when running in the whole working range, namely the comprehensive running efficiency of the pump is improved.

Description

Double-suction volute core-pulling type long-shaft pump
Technical Field
The invention relates to the field of pumps, in particular to a double-suction volute core-pulling type long-shaft pump.
Background
The vertical long-shaft pump is a submerged dry pump, i.e. the motor is above the foundation and the pump is below the foundation. The vertical long-shaft pump on the market at present is mostly a single-stage single suction pump (as shown in the attached drawing 1) or a multi-stage single suction pump (as shown in the attached drawing 2), and is mainly used as a steel mill cyclone well (tank) lift pump, because the underground depth of the steel mill cyclone well (tank) is deep, the water temperature is relatively high, the start is frequent, the common seal-free self-control self-suction pump cannot meet the requirement of suction, the start time is long, the efficiency is extremely low, and the usable submersible pump has certain electrical safety hazards. Compared with a non-sealing self-control self-sucking pump, the vertical long-shaft pump has the advantages of strong sucking capacity, high efficiency, short starting time, safety and reliability and long service life compared with a submersible pump.
In terms of performance, a single-suction impeller and a space guide vane structure are mostly adopted in the traditional vertical long-shaft pump, when the specific revolution is higher than 300, the efficiency of the single-suction impeller is lower than that of a double-suction impeller, and the efficiency of the space guide vane is lower than that of a volute, namely the efficiency of the pump is lower. From structure and reliability, traditional vertical long-shaft pump often can adopt and protect axle sleeve structure when being used as steel mill whirl well (pond) elevator pump to clear water lubricated axle and water guide bearing avoid pumping medium water to get into the intraductal damage axle of cover and water guide bearing, and the lubricated water that supplies can appear the condition that pressure is less than pump pressure itself, make in medium water can ooze the cover, thereby counter shaft and water guide bearing play the destruction effect, the operational reliability of pump is lower promptly.
The hydraulic design of the traditional vertical long-shaft pump is designed according to the design method of the conventional clean water pump, wherein the design and calculation of main hydraulic parameters of an impeller are as follows:
1) width b of impeller outlet2＝(0.64～0.7)(ns/100)5/6(Q/n)1/3 (mm)
2) Impeller outer diameter D2＝(9.35～9.6)(ns/100)-1/2(Q/n)1/3 (mm)
3) Equivalent inner diameter D of impeller inlet0＝(4～4.5)(Q/n)1/3 (mm)
4) Blade wrap angle phi and blade outlet setting angle beta2
In general, the blade wrap angle φ decreases with increasing specific speed ns, and the blade exit lay angle β2Increases with increasing specific speed ns. For low specific speed pumps, the blade exit setting angle beta is reduced due to reduced disc friction losses2And increasing the wrap angle phi of the blade.
5) Number of blades Z
The number of revolutions per unit of 1200-210 is usually 6, the number of revolutions per unit of less than 120 is usually 4-5 or 8-12 long and short blades are arranged at intervals, and the number of revolutions per unit of more than 210 is usually 5.
Therefore, there is still a lack in the art of a more efficient and reliable vertical long shaft pump that effectively overcomes the above-mentioned problems of the conventional vertical long shaft pump.
Disclosure of Invention
The invention aims to provide a double-suction volute core-pulling type long shaft pump which is used for solving the problems that the efficiency of the existing vertical long shaft pump is lower when the specific revolution is more than 300, the shaft and a water guide bearing of the existing vertical long shaft pump are easy to damage, the maintenance period of the pump is short, and the service life of the pump is short.
The invention provides a double-suction volute core-pulling type long-shaft pump which comprises a double-flow-channel volute, wherein the double-flow-channel volute is of a centrosymmetric structure; a double suction impeller located in the dual flow volute; the double-suction impeller is fixed at the lower end of the impeller shaft and rotates along with the impeller shaft; the double-suction impeller is fixedly connected with the impeller shaft and rotates relative to the double-flow volute through the water guide bearing; the transmission shaft is a vertical shaft, is coaxially arranged with the impeller shaft and is arranged on the impeller shaft; the upper end of the impeller shaft is fixedly connected with the coupler, the lower end of the transmission shaft is fixedly connected with the coupler, the impeller shaft and the transmission shaft are connected into a whole through the coupler, and the coupler is a sleeve coupler; the upper end of the transmission shaft is fixedly connected with the core-pulling component, and the core-pulling component is detachably and fixedly connected with the base.
In another preferred embodiment, the pump includes a water inlet horn in fluid communication with the dual-flow volute.
In another preferred example, the pump includes an impeller pressing plate, and the double suction impeller is fixed to the impeller shaft by the impeller pressing plate.
In another preferred example, the pump includes a seal ring for protecting the dual-flow volute.
In another preferred example, the sealing ring is fixed to the dual-flow volute.
In another preferred example, the pump includes a shaft protection sleeve, the shaft protection sleeve is fixedly connected with the dual-channel volute, and the shaft protection sleeve is sleeved on the impeller shaft, and the shaft protection sleeve is used for preventing the conveyed medium water from entering the inside of the shaft protection sleeve, so as to protect the impeller shaft and the water guide bearing.
In another preferred example, the pump comprises a water outlet elbow for changing the flow direction of the water.
In another preferred example, the water outlet elbow converts the axial flow of water into radial flow and conveys the radial flow out.
In another preferred embodiment, the water outlet bent pipe is fixedly connected with the base and the water raising pipe.
In another preferred example, the pump includes a water raising pipe, the water raising pipe is connected to the water outlet elbow pipe through a bolt, and the water raising pipe is used for axially discharging the fluid in the double-channel volute into the water outlet elbow pipe.
In another preferred example, the water inlet horn is connected to the water raising pipe through a bolt.
In another preferred example, the water guide bearing is a carbon fiber teflon water guide bearing.
It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a conventional single stage, single suction, vertical, long axis pump;
FIG. 2 is a cross-sectional view of a conventional multi-stage, single suction, vertical, long axis pump;
FIG. 3 is a cross-sectional view of a double suction volute cored long shaft pump in one example of the present invention;
FIG. 4 is a schematic diagram of the hydraulic design of the double suction volute cored long shaft pump of FIG. 3;
FIG. 5 is a schematic view of a symmetrical dual-flowpath volute configuration of the dual-suction volute cored long shaft pump of FIG. 3;
fig. 6 is a schematic diagram of the high efficiency low pulsation double suction impeller configuration of the double suction volute cored long shaft pump of fig. 3.
In the drawings, each symbol is as follows:
1-a water inlet horn;
2-a water raising pipe;
3-impeller pressing plate;
4-high-efficiency low-pulsation double-suction impeller;
5-a sealing ring;
6-symmetrical double-flow volute;
7-carbon fiber Teflon water guide bearing;
8-a shaft protecting sleeve;
9-impeller shaft;
10-water outlet elbow pipe;
11-a sleeve coupling;
12-a drive shaft;
13-a core back component;
14-embedding a base.
Detailed Description
The inventor of the invention develops a double-suction volute core-pulling type long-shaft pump for the first time through extensive and intensive research and a large number of screens, compared with the prior art, the double-suction volute core-pulling type long-shaft pump of the invention aims at the broad high-efficiency area while pursuing high efficiency by balancing hydraulic loss, volume loss and mechanical loss, namely, the width of the outlet of the impeller is increased, the outer diameter of the impeller is reduced, the wrap angle of the outlet of the blade is increased, the setting angle of the outlet of the blade is reduced, the flow cross section area of a pumping chamber of a pump body is increased, the symmetrical double-flow passage volute which is originally a radial volute is converted into an axial flow passage structure, the carbon fiber Teflon water guide bearing is used, the impeller is more wear-resistant and durable, the upper inlet of the impeller is in a negative pressure state, positive pressure clear water is arranged in the shaft protecting sleeve, the conveyed medium water can not enter the shaft protecting sleeve, and the shaft and the water guide bearing are well protected, so that the invention is completed on the basis.
The invention aims to provide a high-efficiency and high-reliability double-suction volute core-pulling type vertical long-shaft pump, which comprises a unique design idea, a hydraulic power value-taking method and a novel overall structure design, so as to solve the problem that the conventional vertical long-shaft pump has lower efficiency when the specific revolution is more than 300, and solve the problems that a shaft and a water guide bearing of the conventional vertical long-shaft pump are easy to damage, the maintenance cycle of the pump is short, the service life of the pump is short, and the like.
Typically, the double-suction volute core-pulling type long-axis pump comprises a double-flow-channel volute, wherein the double-flow-channel volute is of a central symmetrical structure; a double suction impeller located in the dual flow volute; the double-suction impeller is fixed at the lower end of the impeller shaft and rotates along with the impeller shaft; the double-suction impeller is fixedly connected with the impeller shaft and rotates relative to the double-flow volute through the water guide bearing; the transmission shaft is a vertical shaft, is coaxially arranged with the impeller shaft and is arranged on the impeller shaft; the upper end of the impeller shaft is fixedly connected with the coupler, the lower end of the transmission shaft is fixedly connected with the coupler, the impeller shaft and the transmission shaft are connected into a whole through the coupler, and the coupler is a sleeve coupler; the upper end of the transmission shaft is fixedly connected with the core-pulling component, and the core-pulling component is detachably and fixedly connected with the base.
In another preferred embodiment, the pump includes a water inlet horn in fluid communication with the dual-flow volute.
In another preferred example, the pump includes an impeller pressing plate, and the double suction impeller is fixed to the impeller shaft by the impeller pressing plate.
In another preferred example, the pump comprises a sealing ring which is used for being mounted on the double-channel volute and protecting the double-channel volute.
In another preferred example, the sealing ring is fixed to the dual-flow volute.
In another preferred example, the pump includes a shaft protection sleeve, the shaft protection sleeve is fixedly connected with the dual-channel volute, and the shaft protection sleeve is sleeved on the impeller shaft, and the shaft protection sleeve is used for preventing the conveyed medium water from entering the inside of the shaft protection sleeve, so as to protect the impeller shaft and the water guide bearing.
In another preferred example, the pump comprises a water outlet elbow, and the water outlet elbow is used for being connected with the base and the water raising pipe and is used for converting water from axial flow to radial flow and conveying the water out.
In another preferred example, the water outlet elbow is fixed on the base through bolts.
In another preferred example, the pump includes a water raising pipe, the water raising pipe is connected to the water outlet elbow pipe through a bolt, and the water raising pipe is used for axially discharging the fluid in the double-channel volute casing to the water inlet and outlet elbow pipe.
In another preferred example, the water inlet horn is connected to the water raising pipe through a bolt.
In another preferred example, the water guide bearing is a carbon fiber teflon water guide bearing.
In another preferred example, in an operating state, the transmission shaft is driven to rotate by external power (e.g., a motor, etc.) so as to drive the impeller shaft to rotate by the coupling, the double-suction impeller rotates along with the transmission shaft, and water enters the double-flow-channel volute from the upper and lower suction ports of the double-flow-channel volute, enters the double-suction impeller from the upper and lower suction ports of the double-flow-channel volute, and then flows out in the axial direction after energy conversion.
When the double-suction volute core-pulling type long-shaft pump is maintained, the whole main body (the main body is an integral body formed by the double-channel volute, the double-suction impeller, the impeller shaft, the water guide bearing, the transmission shaft, the coupling, the core-pulling component and the like) can be pulled out only by loosening the connecting bolt between the core-pulling component and the embedded base, and a water outlet bent pipe, an embedded base and a water lifting pipe are not needed.
Compared with the traditional vertical long-axis pump, the high-efficiency double-suction volute core-pulling type long-axis pump designed by the novel design method has the following effects:
(a) the high-efficiency low-pulsation double-suction impeller has the advantages that the outlet width is wide, the wrap angle is large, the blade outlet placement angle is small, the loss in the impeller is small, the efficiency is high, and the high-efficiency area is wide;
(b) the specific revolution of the high-efficiency low-pulsation double-suction impeller relative to the single-suction impeller is lower, so that the specific revolution of the pump enters or approaches to the specific revolution of the high-efficiency area (between 120 and 210), and the efficiency of the pump is relatively higher;
(c) the high-efficiency low-pulsation double-suction impeller does not theoretically generate axial force due to the symmetrical structure;
(d) the blades on the two sides of the high-efficiency low-pulsation double-suction impeller are arranged at intervals relatively and uniformly, so that the instability of the operation of the pump can be effectively reduced, and the operation pulsation is reduced;
(e) compared with the traditional space guide vane, the novel symmetrical double-flow-channel volute has higher efficiency;
(f) the symmetrical double-flow-channel volute can effectively reduce radial force due to symmetrical structure, and the radial force is approximately zero theoretically;
(g) compared with the traditional rubber bearing, the carbon fiber Teflon water guide bearing is more wear-resistant and durable;
(h) the inlets at two sides of the high-efficiency low-pulsation double-suction impeller are in a negative pressure state, and the lubricating clear water in the sleeve is in a positive pressure state, so that the conveyed medium water is difficult to enter the shaft protecting sleeve, the impeller shaft and the water guide bearing are difficult to damage, and the service life of the pump is longer;
(i) because the axial force generated by the impeller is approximately zero, the radial force is approximately zero due to the symmetrical double-flow-channel volute, the load of the rolling bearing and the water guide bearing is small, and the service life of the pump is long, the maintenance cycle of the pump is effectively prolonged, and the service life of the pump is prolonged;
(j) the whole main body can be drawn out without moving the water outlet bent pipe, the embedded base and the water raising pipe, the operation is simple, the maintenance is convenient, the maintenance time is shortened, and the maintenance cost is reduced.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, the drawings are schematic and, thus, the apparatus and devices of the present invention are not limited by the size or scale of the schematic.
It is to be noted that in the claims and the description of the present patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
Examples
The double-suction volute core-pulling type long-shaft pump of the embodiment is shown in fig. 3-6, and comprises an impeller pressing plate 3, a high-efficiency low-pulsation double-suction impeller 4, a sealing ring 5, the centrifugal pump comprises a symmetrical double-channel volute 6, a carbon fiber Teflon water guide bearing 7, a shaft protecting sleeve 8, an impeller shaft 9, a sleeve coupler 11, a transmission shaft 12 and the like, wherein a core pulling part 13 and a water outlet bent pipe 10 are fixed on an embedded base 14 through bolts, a water lifting pipe 2 is connected on the water outlet bent pipe 10 through bolts, a water inlet loudspeaker 1 is connected on the water lifting pipe 2 through bolts, the impeller shaft 9 and the transmission shaft 12 are connected together through the sleeve coupler 11, a sealing ring 5 and the carbon fiber Teflon water guide bearing 7 are assembled on the symmetrical double-channel volute 6, a high-efficiency low-pulsation double-suction impeller 4 is fixed on the impeller shaft 9 through an impeller pressing plate 3, a screw assembly and a key, and the shaft protecting sleeve 8 is assembled on the symmetrical double-channel volute 6 and is sheathed on the impeller. The external power drives the transmission shaft 12 to rotate, the impeller shaft 9 is driven to rotate through the sleeve coupling 11, so that the high-efficiency low-pulsation double-suction impeller rotates along with the high-efficiency low-pulsation double-suction impeller, water enters the symmetrical double-flow-channel volute 6 from the upper suction port and the lower suction port of the symmetrical double-flow-channel volute 6, the high-efficiency low-pulsation double-suction impeller 4 flows out along the axial direction after energy conversion, the carbon fiber Teflon water guide bearing 7 plays a role in radial support, and the shaft protection sleeve 8 prevents conveyed medium water from entering the inside of the shaft protection sleeve 8 to protect the impeller shaft 9 and the carbon fiber Teflon water guide bearing 7.
When the water pumping device needs to be maintained, the whole main body can be pumped out only by loosening the connecting bolt between the core pulling part 13 and the embedded base 14 without moving the water outlet bent pipe 10, the embedded base 14 and the water pumping pipe 2, so that the operation is simple and the maintenance is convenient.
The main hydraulic parameters or coefficients of the pump take the following values:
1) width b of impeller outlet2＝Kb2(ns/100)0.7 (Q/n)1/3 (mm)
ns 180 210 240 270 320
Kb2 0.7 0.69 0.68 0.67 0.66
2) Impeller outer diameter D2＝KD2(ns/100)-0.5 (Q/n)1/3 (mm)
ns 180 210 240 270 320
KD2 9.12 9.12 9.12 9.20 9.25
3) Equivalent diameter coefficient K of impeller inletD0
ns 180 210 240 270 320
KD2 4.3 4.2 4.1 4.05 4.0
4) Number of blades Z, blade wrap angle phi and blade exit setting angle beta2
ns 180 210 240 270 320
Z 6 6 6 5 5
φ 110° 105° 100° 95° 90°
β2 26° 26° 27° 27° 28°
5) Coefficient of ratio D of pump body base circle to impeller outer diameter3/D2
ns 180 210 240 270 320
D3/D2 1.05 1.06 1.07 1.08 1.1
6) Velocity coefficient of volute section K3
ns 180 210 240 270 320
KD2 0.32 0.31 0.30 0.29 0.28
7) Double-flow-channel volute partition tongue mounting angle phi0
ns 180 210 240 270 320
φ0 14 16 18 20 22
The main hydraulic parameters are taken by increasing the width of an impeller outlet, reducing the outer diameter of the impeller, increasing the wrap angle of a blade outlet, reducing the placement angle of the blade outlet and increasing the flow cross section area of a pumping chamber of a pump body.
The high-efficiency low-pulsation double-suction impeller is wide in blade outlet width, large in wrap angle and small in outlet placement angle, and the symmetrical double-flow-channel volute is of a structure that a radial volute is converted into an axial flow channel. The carbon fiber Teflon water guide bearing is more wear-resistant and durable. The upper inlet of the impeller is in a negative pressure state, and the inside of the shaft protecting sleeve is filled with positive pressure clear water, so that the conveyed medium water cannot enter the shaft protecting sleeve, and the shaft and the water guide bearing are well protected. The radial forces of the double-flow volute are balanced mutually, and the shaft and the water guide bearing are well protected.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.

Claims (8)

1. A double-suction volute core-pulling type long shaft pump is characterized by comprising
The double-flow-channel volute is of a centrosymmetric structure;
a double suction impeller located in the dual flow volute;
the double-suction impeller is fixed at the lower end of the impeller shaft and rotates along with the impeller shaft;
the double-suction impeller is fixedly connected with the impeller shaft and rotates relative to the double-flow volute through the water guide bearing;
the transmission shaft is a vertical shaft, is coaxially arranged with the impeller shaft and is arranged on the impeller shaft;
the upper end of the impeller shaft is fixedly connected with the coupler, the lower end of the transmission shaft is fixedly connected with the coupler, the impeller shaft and the transmission shaft are connected into a whole through the coupler, and the coupler is a sleeve coupler; and
the upper end of the transmission shaft is fixedly connected with the core-pulling component, and the core-pulling component is detachably and fixedly connected with the base.
2. The pump of claim 1, wherein the pump includes a water intake horn in fluid communication with the dual-flow volute.
3. The pump of claim 1, wherein the pump comprises an impeller pressure plate, the double suction impeller being secured to the impeller shaft by the impeller pressure plate.
4. The pump of claim 1, comprising a seal ring for protecting the dual-flow volute.
5. The pump of claim 1, wherein said pump comprises a shaft protection sleeve fixedly connected with said dual-channel volute and sheathed on said impeller shaft, said shaft protection sleeve being used for preventing the conveyed medium water from entering the interior of said shaft protection sleeve and further protecting said impeller shaft and said water guide bearing.
6. The pump of claim 1, wherein the pump includes a water outlet elbow for changing the direction of flow of water.
7. The pump of claim 1 including a lift tube bolted to said outlet elbow, said lift tube for axially discharging fluid from said dual flow volute into said outlet elbow.
8. The pump of claim 1, wherein the hydro-bearing is a carbon fiber teflon hydro-bearing.
CN201910770258.2A 2019-08-20 2019-08-20 Double-suction volute core-pulling type long-shaft pump Pending CN112412807A (en)

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CN201910770258.2A CN112412807A (en) 2019-08-20 2019-08-20 Double-suction volute core-pulling type long-shaft pump

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Application Number Priority Date Filing Date Title
CN201910770258.2A CN112412807A (en) 2019-08-20 2019-08-20 Double-suction volute core-pulling type long-shaft pump

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CN112412807A true CN112412807A (en) 2021-02-26

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CN201910770258.2A Pending CN112412807A (en) 2019-08-20 2019-08-20 Double-suction volute core-pulling type long-shaft pump

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