CN113236578B - Shaft end blade cavitation prevention mechanism capable of automatically extending out - Google Patents

Shaft end blade cavitation prevention mechanism capable of automatically extending out Download PDF

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Publication number
CN113236578B
CN113236578B CN202110473025.3A CN202110473025A CN113236578B CN 113236578 B CN113236578 B CN 113236578B CN 202110473025 A CN202110473025 A CN 202110473025A CN 113236578 B CN113236578 B CN 113236578B
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China
Prior art keywords
sliding
radial
sliding groove
end cover
spring
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CN202110473025.3A
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Chinese (zh)
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CN113236578A (en
Inventor
柏宇星
徐翊竣
李鑫
苗婧
孙铖涛
王义云
董千
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Nanjing Institute of Technology
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Nanjing Institute of Technology
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Priority to CN202110473025.3A priority Critical patent/CN113236578B/en
Publication of CN113236578A publication Critical patent/CN113236578A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • 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
    • F04D29/007—Details, component parts, or accessories 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
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • 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
    • F04D29/247—Vanes elastic or self-adjusting
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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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 an automatic extending shaft end blade anti-cavitation mechanism, which comprises an end cover, an outer sleeve body, a T-shaped sliding piece and blades arranged in the T-shaped sliding piece, wherein one end of the end cover is provided with a sliding groove A; the T-shaped sliding piece comprises an axial connecting part and a radial connecting part which are vertically arranged, and the axial connecting part is connected with the bottom end of the sliding chute A through a first elastic connecting assembly; the radial connecting part is provided with a sliding chute B with an opening facing to the radial outer direction, and the blade is connected with the bottom end of the sliding chute B through a second elastic connecting assembly; the outer sleeve body is sleeved on the outer side of the end cover, the front end of the outer sleeve body is provided with a movable self-locking assembly, and the movable self-locking assembly provides thrust pointing to the end cover for the T-shaped sliding piece when not being subjected to the action of centrifugal force. The anti-cavitation mechanism arranged at the pump inlet can automatically eject the blade according to the liquid level operation depth of the pump, and the ejected blade and the main shaft of the pump synchronously rotate to provide pressure for the pump inlet, so that cavitation is prevented, energy consumption is low, and the pump is energy-saving and environment-friendly.

Description

Shaft end blade cavitation prevention mechanism capable of automatically extending out
Technical Field
The invention belongs to the field of fluid machinery, and particularly relates to an automatic extending shaft end blade cavitation prevention mechanism.
Background
When the submersible pump works, the pressure at the inlet of the pump is continuously reduced along with the continuous reduction of the water surface, so that the cavitation phenomenon is generated. If the inducer (or other boosting impellers) are directly arranged at the inlet of the pump, although cavitation of the pump at a low water level can be effectively prevented, under the condition that cavitation of a high water level unit cannot occur, the inducer (or other boosting impellers) bring extra unnecessary energy loss.
Disclosure of Invention
Aiming at the problem of cavitation of the submersible pump in the prior art, the invention provides an automatic extending shaft end blade cavitation prevention mechanism.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
an automatic-extending shaft end blade anti-cavitation mechanism comprises an end cover, an outer sleeve body, sliding grooves A which are arranged at the end part of the end cover at equal angles around the central axis of the end cover, a T-shaped sliding piece which is correspondingly installed with the sliding grooves A, and blades which are arranged in the T-shaped sliding piece;
the T-shaped sliding part comprises an axial connecting part and a radial connecting part which are vertically arranged, and the axial connecting part is connected with the bottom end of the sliding chute A through a first elastic connecting assembly and slides along the guiding direction of the sliding chute A; the radial connecting part is provided with a sliding chute B with an opening facing to the radial outer direction, and the blade is connected with the bottom end of the sliding chute B through a second elastic connecting assembly and slides along the guide direction of the sliding chute B;
the outer sleeve body is sleeved on the outer side of the end cover, the front end of the outer sleeve body is provided with a movable self-locking assembly acting on the radial connecting portion, and the movable self-locking assembly provides thrust pointing to the end cover for the T-shaped sliding piece when not subjected to centrifugal force.
As a further improvement of the invention, the end cover is arranged coaxially with the pump main shaft.
As a further improvement of the invention, the dimension of the front end face of the outer sleeve beyond the end face of the end cover is larger than the dimension of the radial connecting portion in the axial direction of the end cover.
As a further improvement of the present invention, the first elastic connecting assembly includes a first spring and a first piston which are connected to each other, the other end of the first spring is fixed to the bottom of the sliding groove a, and the other end of the first piston is connected to the axial connecting portion.
As a further improvement of the present invention, the second elastic connecting assembly includes a second spring and a second piston connected to each other, the other end of the second spring is fixed to the bottom of the sliding groove B, and the other end of the second piston is connected to the vane connecting portion.
As a further improvement of the invention, the device further comprises a radial bolt, wherein the radial bolt is arranged at the notch position of the sliding chute A and is inserted into the sliding chute A from the outer side of the outer sleeve body along the radial direction; the axial connecting portion is equipped with outside bellied first boss for the opposite side of notch, the bolt top of radial bolt reaches the distance of axial connecting portion axis is greater than the main part diameter of axial connecting portion, but is less than the maximum external diameter of first boss, first boss with radial bolt is along the axial direction maximum distance on less than the flexible volume of first spring.
As a further improvement of the present invention, a snap ring is disposed on an inner wall surface of the notch of the sliding groove B, a second boss protruding outward is disposed on one side of the radial connecting portion opposite to the notch, a minimum diameter of the snap ring is smaller than a maximum outer diameter of the second boss and larger than a main diameter of the radial connecting portion, and a maximum distance between the second boss and the snap ring in a radial direction is smaller than a telescopic amount of the second spring.
As a further improvement of the invention, the sliding distance of the axial connecting part in the axial direction is greater than the moving distance of the sliding groove B completely extending out of the front end face of the outer sleeve.
As a further improvement of the invention, the outer sleeve body is radially provided with a mounting hole, the movable self-locking assembly comprises a sliding block sleeve body, a third spring and a sliding block, the sliding block sleeve body is provided with a sliding groove D along the radial direction and fixed in the mounting hole, one end of the third spring is connected with the bottom of the sliding groove D, and the other end of the third spring is connected with the sliding block; a sliding groove C is formed in the radial direction of the end portion of the T-shaped sliding piece, the sliding groove D and the sliding groove C are collinear in the initial state, two ends of the sliding block are located in the sliding groove D and the sliding groove C respectively, and in the rotating state, the centrifugal force of the sliding block overcomes the elastic force of a third spring and moves towards the direction of the sliding groove D.
The sliding middle sleeve is arranged at the central axis of the end cover, the sliding middle sleeve and the end cover are coaxially arranged, the surface of the sliding middle sleeve is provided with balls which roll in the axial direction of the end cover in parallel, and the balls are in sliding contact with the radial connecting part.
The invention has the beneficial effects that: the anti-cavitation mechanism arranged at the pump inlet has a simple structure, can automatically eject the blade according to the liquid level operation depth of the pump, and the ejected impeller and the main shaft of the pump synchronously rotate to provide pressure for the pump inlet, so that cavitation is prevented, energy consumption is low, and the anti-cavitation mechanism is energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic view of the present invention in an installed position in a pump assembly;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention;
FIG. 3 is a schematic view of the self-locking assembly structure and the installation position;
wherein: 1-end cap, 2-outer sleeve, 3-radial bolt, 4-snap ring, 5-blade, 6-T-shaped sliding piece, 601-axial connecting part, 602-radial connecting part, 7-second piston, 8-second spring, 9-sliding ball, 10-sliding middle sleeve, 11-first piston, 12-first spring; 13-a slider sleeve; 14-a third spring; 15-sliding block
101-chute a, 511-second boss, 603-chute B, 604-chute C, 611-first boss, 1301-chute D.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
The installation position of the anti-cavitation mechanism of the present invention shown in fig. 1 is set at the end of the pump main shaft and is coaxially connected thereto.
The specific structure of the anti-cavitation mechanism of the present invention as shown in fig. 2 comprises an end cover 1 coaxially connected with a main shaft of a pump, wherein the outer wall of the front end of the end cover 1 is lathed with a thread structure connected with an outer sleeve 2, and the anti-cavitation mechanism further comprises a T-shaped sliding part 6 which is arranged around a central shaft at an equal angle.
The T-shaped sliding part 6 comprises an axial connecting part 601 and a radial connecting part 602 which are vertically arranged, a sliding chute A101 for connecting the axial connecting part 601 is arranged at an equal angle at the end part of the end cover 1 around the central axis of the end cover, and the axial connecting part 601 is connected with the bottom end of the sliding chute A101 through a first elastic connecting assembly and slides along the guiding direction of the sliding chute A101. Radial connecting portion 602 is equipped with opening towards radial outside direction's spout B603, still includes and sets up blade 5 in spout B603, blade 5 through second elastic connection subassembly with the bottom of spout B603 links to each other, and along the direction of direction slip of spout B603.
The first elastic connecting assembly comprises a first spring 12 and a first piston 11 which are connected with each other, the other end of the first spring 12 is fixed at the bottom of the sliding groove a101, and the other end of the first piston 11 is connected with the axial connecting portion 601 and used for pushing the T-shaped sliding piece 6 to slide outwards along the axial direction.
The second elastic connecting assembly comprises a second spring 8 and a second piston 7 which are connected with each other, the other end of the second spring 8 is fixed at the bottom of the sliding groove B603, the other end of the second piston 7 is connected with the connecting part of the blade 5 and used for pushing the blade 5 to move outwards along the radial direction of the sliding groove B603 and providing centripetal force for the circular motion of the blade 5.
In addition, a movable self-locking assembly connected with the front end of the radial connecting portion 602 is arranged at the front end of the outer sleeve 2, and the size of the front end face of the outer sleeve 2 exceeding the end face of the end cover 1 is larger than the size of the radial connecting portion 602 along the axial direction of the end cover 1. When the movable self-locking assembly is not subjected to the action of centrifugal force, thrust which points to the end cover 1 is provided for the T-shaped sliding piece 6, the thrust is larger than the elastic force of the first elastic connecting assembly, the T-shaped sliding piece 6 is pushed into the innermost side of the sliding groove A101, and the blades 5 are sealed in the sliding groove B603.
The end part of the outer sleeve body 2 is provided with a mounting hole along the radial direction, the movable self-locking assembly comprises a slider sleeve body 13, a third spring 14 and a slider 15, the slider sleeve body 13 is connected to the mounting hole of the outer sleeve body 2 through a fastening piece, a sliding groove D1301 is formed in one side of the slider sleeve body 13 close to the T-shaped slider 6, the third spring 14 and the slider 15 which are connected with each other are arranged inside the sliding groove D1301, and the other end of the third spring 14 is connected to the bottom of the sliding groove D1301. When the T-shaped sliding part 6 does not axially extend rightward, a sliding groove C604 is arranged in the T-shaped sliding part 6, and faces the sliding groove D1301. In the initial state, the third spring 14 is freely extended, the sliding block 15 stays at the sliding groove D1301 for a while, the sliding block C604 extends into the sliding groove C to provide the pushing force to the T-shaped sliding member 6 towards the end cover 1. When the pump unit works, the whole mechanism rotates along with the main shaft, the sliding block 15 overcomes the elastic force of the third spring 14 under the action of centrifugal force, so that the sliding block 15 integrally falls into the groove hole of the sliding groove D1301, and axial leftward thrust is not provided for the T-shaped sliding part 6 any more. The leftward thrust of the T-shaped slider 6 is provided by the water bottom depth pressure (the submersible pump is submerged in the water body for working).
The installation process comprises the following steps: the third spring 14 and the sliding block 15 are connected with each other and are installed in the sliding groove D1301, and the T-shaped sliding piece 6 is firstly pressed to the right in the axial direction to a specified position, namely the first spring 12 is completely compressed; and then the slide block sleeve body 13 is fixedly connected to the outer sleeve body 2 through a fastening piece, the chute D1301 is opposite to the chute C604, the third spring 14 freely extends, one section of the slide block 15 extends into the chute C604, and the other section of the slide block stays in the chute D1301.
Because the first spring 12 provides an axial rightward spring force, when the working fluid level of the pump unit is at a certain depth, the T-shaped slider 6 is subjected to a larger axial leftward force, the T-shaped slider 6 does not extend to the right end, and the top ends of the blades 5 arranged in the radial direction are subjected to the acting force of the outer sleeve 2 and do not extend in the radial direction. When the working liquid level of the pump unit is lowered to a certain depth (calculation can be carried out according to the cavitation occurrence condition), the liquid pressure borne by the lower end of the T-shaped sliding part 6 is reduced, the axial rightward spring force provided by the first spring 12 is larger than the leftward force exerted on the T-shaped sliding part 6 by the liquid level, at the moment, the whole T-shaped sliding part 6 moves axially rightward, after the notch of the sliding groove B603 completely moves beyond the edge of the outer sleeve body 2, the blade 5 arranged in the sliding groove B603 extends out of the sliding groove B603 under the action of centrifugal force and the second elastic connecting assembly and serves as a boosting impeller (inducer) to boost the pressure of the inlet of the pump, and the cavitation can be effectively prevented.
Besides the main structure, the connecting part of each part of the mechanism is also provided with a limiting assembly so as to avoid excessive movement of each part of the mechanism caused by overlarge rotating speed of the pump.
The structure of spacing subassembly includes:
and the radial bolt 3 is arranged at the position of the notch of the sliding chute A101, and the radial bolt 3 is inserted into the sliding chute A101 from the outer side of the outer sleeve 2 in the radial direction.
The other side of the axial connecting portion 601 opposite to the notch is provided with a first boss 611 protruding outwards, the distance from the bolt top end of the radial bolt 3 to the central axis of the axial connecting portion 601 is greater than the main diameter of the axial connecting portion 601, but smaller than the maximum outer diameter of the first boss 611, and the maximum distance between the first boss 611 and the radial bolt 3 in the axial direction is smaller than the expansion and contraction amount of the first spring 12.
(2) The inner wall face of spout B603 notch is equipped with snap ring 4, radial connecting portion 602 is equipped with outside bellied second boss 511 for one side of notch, the minimum diameter of snap ring 4 is less than the biggest external diameter of second boss 511 is greater than the main part diameter of radial connecting portion 602, second boss 511 with snap ring 4 is less than along the radial direction maximum distance in the volume of stretching out and drawing back of second spring 8.
In addition, in order to ensure that the vane 5 can be effectively ejected, the sliding distance of the axial connecting portion 601 in the axial direction is greater than the moving distance of the sliding groove B603 completely extending out of the front end surface of the outer casing 2.
In addition, in order to keep the stress balance of the T-shaped sliding piece 6 in the radial direction, a sliding middle sleeve 10 is arranged at the central axis position of the end cover 1, fastening is carried out by using a fastening piece, and the sliding middle sleeve 10 and the end cover 1 are coaxially arranged. The same sliding middle sleeve 10 is in contact with the outer walls of the radial connecting portions 602 of all the T-shaped sliding pieces 6 arranged circumferentially, specifically, the surface of the sliding middle sleeve 10 is provided with sliding balls 9 rolling parallel to the axial direction of the end cover, and the sliding balls 9 are in sliding contact with the radial connecting portions 602.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides an automatic axle head blade cavitation prevention mechanism that stretches out which characterized in that: the device comprises an end cover, an outer sleeve body, sliding grooves A which are arranged at the end parts of the end cover at equal angles around the central axis of the end cover, a T-shaped sliding piece which is correspondingly installed with the sliding grooves A, and blades which are arranged in the T-shaped sliding piece;
the T-shaped sliding part comprises an axial connecting part and a radial connecting part which are vertically arranged, and the axial connecting part is connected with the bottom end of the sliding chute A through a first elastic connecting assembly and slides along the guiding direction of the sliding chute A; the radial connecting part is provided with a sliding chute B with an opening facing to the radial outer side direction, and the blade is connected with the bottom end of the sliding chute B through a second elastic connecting assembly and slides along the guide direction of the sliding chute B;
the first elastic connecting assembly comprises a first spring and a first piston which are connected with each other, the other end of the first spring is fixed at the bottom of the sliding groove A, and the other end of the first piston is connected with the axial connecting part;
the second elastic connecting assembly comprises a second spring and a second piston which are connected with each other, the other end of the second spring is fixed at the bottom of the sliding groove B, and the other end of the second piston is connected with the blade connecting part;
the outer sleeve body is sleeved on the outer side of the end cover, the front end of the outer sleeve body is provided with a movable self-locking assembly acting on the radial connecting portion, and the movable self-locking assembly provides thrust pointing to the end cover for the T-shaped sliding piece when not under the action of centrifugal force;
the end part of the outer sleeve body is radially provided with a mounting hole, the movable self-locking assembly comprises a sliding block sleeve body, a third spring and a sliding block, the sliding block sleeve body is provided with a sliding groove D in the radial direction and fixed in the mounting hole, one end of the third spring is connected with the bottom of the sliding groove D, and the other end of the third spring is connected with the sliding block; a sliding groove C is formed in the radial direction of the end portion of the T-shaped sliding piece, the sliding groove D and the sliding groove C are collinear in the initial state, two ends of the sliding block are located in the sliding groove D and the sliding groove C respectively, and in the rotating state, the centrifugal force of the sliding block overcomes the elastic force of a third spring and moves towards the direction of the sliding groove D.
2. An automatically extending shaft end blade cavitation prevention mechanism as set forth in claim 1 wherein: the end cover is coaxially arranged with the pump main shaft.
3. An automatically extending shaft end blade cavitation prevention mechanism as set forth in claim 1 wherein: the size of the front end face of the outer sleeve exceeding the end face of the end cover is larger than the size of the radial connecting portion along the axial direction of the end cover.
4. An automatic extending shaft end blade cavitation prevention mechanism as recited in claim 1, further characterized by: the outer sleeve is arranged in the sliding groove A, and the outer sleeve is inserted into the sliding groove A from the outer side of the outer sleeve in the radial direction;
the other side of the axial connecting portion, which is opposite to the notch, is provided with a first boss protruding outwards, the distance from the top end of the radial bolt to the central axis of the axial connecting portion is larger than the radius of the main body of the axial connecting portion but smaller than the maximum radius of the first boss, and the maximum distance between the first boss and the radial bolt in the axial direction is smaller than the expansion amount of the first spring.
5. An automatically extending shaft end blade cavitation prevention mechanism as set forth in claim 1 wherein: the inner wall face of the notch of the sliding groove B is provided with a clamping ring, the blade is provided with a second boss protruding outwards, the minimum diameter of the clamping ring is smaller than the maximum outer diameter of the second boss and larger than the diameter of the main body of the blade, and the maximum distance between the second boss and the clamping ring in the radial direction is smaller than the expansion amount of the second spring.
6. An automatically extending shaft end blade cavitation prevention mechanism as set forth in claim 5 wherein: the sliding distance of the axial connecting part along the axial direction is greater than the moving distance of the sliding groove B which completely extends out of the front end surface of the outer sleeve.
7. An automatically extending shaft end blade cavitation prevention mechanism as set forth in claim 1 wherein: the sliding middle sleeve is arranged at the central axis of the end cover, the sliding middle sleeve and the end cover are coaxially arranged, balls which roll in the axial direction of the end cover in parallel are arranged on the surface of the sliding middle sleeve, and the balls are in sliding contact with the radial connecting portion.
CN202110473025.3A 2021-04-29 2021-04-29 Shaft end blade cavitation prevention mechanism capable of automatically extending out Active CN113236578B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110473025.3A CN113236578B (en) 2021-04-29 2021-04-29 Shaft end blade cavitation prevention mechanism capable of automatically extending out

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Application Number Priority Date Filing Date Title
CN202110473025.3A CN113236578B (en) 2021-04-29 2021-04-29 Shaft end blade cavitation prevention mechanism capable of automatically extending out

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CN113236578A CN113236578A (en) 2021-08-10
CN113236578B true CN113236578B (en) 2022-05-20

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3718325C2 (en) * 1987-03-16 1989-01-19 Lutz Fa Karl DRUM PUMP
CN201246344Y (en) * 2008-09-04 2009-05-27 北京航天石化技术装备工程公司 Separable vertical centrifugal pump
CN102297138A (en) * 2010-06-25 2011-12-28 胥建中 Middle underflow pump
CN111828391B (en) * 2020-06-22 2021-09-21 江苏瑞阳环保有限公司 Shaftless inducer with adjustable blades for pump
CN111963450B (en) * 2020-08-27 2021-09-17 浙江东音科技有限公司 Intelligent automatic cooling submersible pump

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