CN113803243B - Multistage water pump mechanical seal self-cooling device - Google Patents
Multistage water pump mechanical seal self-cooling device Download PDFInfo
- Publication number
- CN113803243B CN113803243B CN202110932385.5A CN202110932385A CN113803243B CN 113803243 B CN113803243 B CN 113803243B CN 202110932385 A CN202110932385 A CN 202110932385A CN 113803243 B CN113803243 B CN 113803243B
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- Prior art keywords
- cooling
- self
- cleaning
- pipe
- water pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
Abstract
The invention discloses a multistage water pump mechanical seal self-cooling device, which relates to the field of water pumps. According to the invention, the function of automatic circulating water cooling of the mechanical seal is realized by utilizing the water pressure difference action at two ends of the water pump, meanwhile, the buffer function of cooling water liquid is realized by utilizing the action of energy conversion, the components such as sealing, carbocycle and the like are prevented from being damaged by heating in the high-speed operation process of the mechanical seal, the scraping cleaning function of the self-cooling outlet pipe and the self-cooling inlet pipe is realized by matching with the water impulsive force through the structural arrangement of the cleaning wheel and the side wall cleaning ring, and meanwhile, the vibration cleaning function of the self-cooling inner pipe is realized by the collision and vibration action of the cleaning wheel and the self-cooling inner pipe, so that the internal cooling water flow is ensured under the condition that the guide pipe is not replaced frequently.
Description
Technical Field
The invention relates to the technical field of water pumps, in particular to a multistage water pump mechanical seal self-cooling device.
Background
In life, chemical production is indispensable, and in the process of generating liquid raw materials, a water pump plays roles in conveying liquid and providing pressure and flow of chemical reaction, and if the water pump fails, the whole system is often stopped. Therefore, the pump functions as a heart in the chemical production process flow, and meanwhile, the quality of the pump directly influences the normal production, so the pump is one of key equipment in the chemical and petroleum departments.
In the past water pump mechanical seal device, because the pump body originally adopts the packing seal form, this seal form pump body operational reliability is not high, can appear leaking the condition often, if cause the mechanical seal form, can receive on-the-spot cooling water piping arrangement restriction, the mechanical seal after the change does not have the cooling water cooling, once there is not cooling for a long time, the inside sealing O type circle of mechanical seal will be heated inefficacy, appears leaking.
In order to solve the problems, a multistage water pump mechanical seal self-cooling device is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a multistage water pump mechanical seal self-cooling device.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multi-stage water pump mechanically sealed self-cooling device, comprising:
the water pump is fixedly arranged at the top end of the water pump base, a first mechanical seal block is fixedly arranged at the driving end of the water pump, and a second mechanical seal block is fixedly arranged at one side, far away from the driving end, of the water pump;
the water cooling circulation device is used for performing circulating water cooling on the double-end mechanical seal and is arranged between the side walls of the first mechanical seal block and the second mechanical seal block;
the elastic bump cleaning device is used for vibrating and scraping the inner wall of the water cooling circulation device to clean the inner wall in a bidirectional manner, and the elastic bump cleaning device is arranged in the water cooling circulation device.
Preferably, the water cooling circulation device comprises a self-cooling inlet pipe, a self-cooling through pipe, a self-cooling outlet pipe, an inlet limiting block, an outlet limiting block, a first elastic rope and a second elastic rope, wherein the self-cooling inlet pipe is fixedly arranged on the side wall of the first mechanical seal block, the self-cooling through pipe is fixedly arranged at the other end of the self-cooling inlet pipe, the self-cooling outlet pipe is fixedly arranged between the self-cooling through pipe and the side wall of the second mechanical seal block, the inlet limiting block is fixedly arranged at the interface end of the self-cooling inlet pipe, the outlet limiting block is fixedly arranged at the interface end of the self-cooling outlet pipe, the first elastic rope is fixedly arranged at one end, away from the inlet limiting block, of the self-cooling inlet pipe, and the second elastic rope is fixedly arranged at the side wall of the outlet limiting block.
Preferably, the elastic bump cleaning device comprises a rotating ring, a connecting rod, a side wall cleaning ring and a cleaning wheel, wherein the rotating ring inside the self-cooling outlet pipe is fixedly connected with the second elastic rope, the rotating ring inside the self-cooling inlet pipe is fixedly connected with the first elastic rope, the connecting rod is rotatably connected with the inner side wall of the rotating ring, the side wall cleaning ring is fixedly installed on the side wall of the connecting rod, and the cleaning wheel is fixedly installed on the side walls of the two ends of the connecting rod.
Preferably, the self-cooling inlet pipe, the self-cooling through pipe and the self-cooling outlet pipe are in through connection, and the self-cooling inlet pipe, the self-cooling through pipe and the self-cooling outlet pipe are positioned on the same horizontal plane.
Preferably, the shapes of the inlet limiting block and the outlet limiting block are the same, and the diameters of the through holes of the inlet limiting block and the outlet limiting block are smaller than the diameter of the cleaning wheel.
Preferably, the two side wall cleaning rings are symmetrically arranged about the central axis of the transverse end of the connecting rod, the two side wall cleaning rings are not contacted with the rotating ring, the side wall of the side wall cleaning rings is sleeved with the cleaning brush, the cleaning brush surrounds the side wall of the side wall cleaning rings, and the outer side wall of the cleaning brush can be attached to the inner wall of the self-cooling inlet pipe and the inner wall of the self-cooling outlet pipe.
Preferably, the diameter of the rotating ring is the same as the diameter of the connecting rod, and the diameter of the rotating opening of the rotating ring is the same as the diameter of the rotating connecting end of the connecting rod.
Preferably, the two cleaning wheels are symmetrically arranged relative to the central axis of the transverse end of the connecting rod, the cleaning wheels are arranged in a structure of protruding scraping wheels, the cross section of the protruding front end of each protruding scraping wheel is arranged in an inward-inclined structure, and the side walls of the cleaning wheels are attached to the inner walls of the self-cooling inlet pipe and the self-cooling outlet pipe.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the cooperation among the water pump, the self-cooling inlet pipe, the self-cooling through pipe, the self-cooling outlet pipe and the cleaning wheel, the function of automatic circulating water cooling of the mechanical seal is realized by utilizing the water pressure difference function at two ends of the water pump, and meanwhile, the buffer function of cooling water liquid is realized by utilizing the function of energy conversion and the structural arrangement of the cleaning wheel, so that the components such as sealing, carbon ring and the like are prevented from being damaged by heating in the working process of high-speed operation of the mechanical seal.
2. The cleaning wheel and the side wall cleaning ring are structurally arranged, the scraping and brushing cleaning functions of the self-cooling outlet pipe and the self-cooling inlet pipe are realized by matching with water impulsion, and the vibrating and cleaning functions of the self-cooling through pipe inner pipe are realized by the collision and vibration actions of the cleaning wheel and the self-cooling through pipe inner pipe, so that the cooling water flow in the self-cooling through pipe inner pipe is ensured under the condition that the guide pipe is not replaced frequently.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a multi-stage water pump mechanical seal self-cooling device according to the present invention;
fig. 2 is a schematic diagram of a self-cooling through pipe of a multi-stage water pump mechanical seal self-cooling device according to the present invention;
FIG. 3 is a schematic diagram of the internal structure of a self-cooling inlet pipe and a self-cooling outlet pipe of the multi-stage water pump mechanical seal self-cooling device;
FIG. 4 is a schematic view of a spring touch cleaning device of a multi-stage water pump mechanical seal self-cooling device;
fig. 5 is a schematic diagram of the internal structure of a flick cleaning device of a multi-stage water pump mechanical seal self-cooling device;
fig. 6 is a schematic diagram of a split structure of an inner connecting end of a flick cleaning device of a multi-stage water pump mechanical seal self-cooling device.
In the figure: 1. a water pump base; 2. a water pump; 21. a first mechanical seal block; 22. a second mechanical seal block; 3. a self-cooling inlet pipe; 31. self-cooling through pipe; 32. a self-cooling outlet pipe; 33. an inlet limiting block; 34. an outlet limiting block; 35. a first elastic cord; 36. a second elastic cord; 4. a rotating ring; 41. a connecting rod; 42. a sidewall cleaning ring; 43. cleaning wheels.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-6, a multi-stage water pump mechanical seal self-cooling device includes:
the water pump comprises a water pump base 1, wherein a water pump 2 is fixedly arranged at the top end of the water pump base 1, a first mechanical seal block 21 is fixedly arranged at the driving end of the water pump 2, and a second mechanical seal block 22 is fixedly arranged at one side, far away from the driving end, of the water pump 2;
the water cooling circulation device is used for performing circulating water cooling on the double-end machine seal and is arranged between the side walls of the first machine seal block 21 and the second machine seal block 22;
the elastic bump cleaning device is used for vibrating and scraping the inner wall of the water cooling circulation device to clean the inner wall in a bidirectional manner, and is arranged in the water cooling circulation device.
The water cooling circulation device comprises a self-cooling inlet pipe 3, a self-cooling through pipe 31, a self-cooling outlet pipe 32, an inlet limiting block 33, an outlet limiting block 34, a first elastic rope 35 and a second elastic rope 36, wherein the self-cooling inlet pipe 3 is fixedly arranged on the side wall of the first mechanical seal block 21, the self-cooling through pipe 31 is fixedly arranged on the other end of the self-cooling inlet pipe 3, the self-cooling outlet pipe 32 is fixedly arranged between the self-cooling through pipe 31 and the side wall of the second mechanical seal block 22, the inlet limiting block 33 is fixedly arranged at the interface end of the self-cooling inlet pipe 3, the outlet limiting block 34 is fixedly arranged at the interface end of the self-cooling outlet pipe 32, the first elastic rope 35 is fixedly arranged at the end, away from the inlet limiting block 33, of the inside of the self-cooling inlet pipe 3, and the second elastic rope 36 is fixedly arranged on the side wall of the outlet limiting block 34.
The flick cleaning device comprises a rotating ring 4, a connecting rod 41, a side wall cleaning ring 42 and a cleaning wheel 43, wherein the rotating ring 4 and the second elastic rope 36 are fixedly connected inside the self-cooling outlet pipe 32, the rotating ring 4 and the first elastic rope 35 are fixedly connected inside the self-cooling inlet pipe 3, the connecting rod 41 and the inner side wall of the rotating ring 4 are rotatably connected, the side wall cleaning ring 42 is fixedly installed on the side wall of the connecting rod 41, and the cleaning wheel 43 is fixedly installed on the side walls of two ends of the connecting rod 41.
The self-cooling inlet pipe 3, the self-cooling through pipe 31 and the self-cooling outlet pipe 32 are connected in a penetrating way, and the self-cooling inlet pipe 3, the self-cooling through pipe 31 and the self-cooling outlet pipe 32 are positioned on the same horizontal plane.
The shapes of the inlet limiting block 33 and the outlet limiting block 34 are the same, and the diameters of the through holes of the inlet limiting block 33 and the outlet limiting block 34 are smaller than the diameter of the cleaning wheel 43.
The two side wall cleaning rings 42 are symmetrically arranged about the transverse end central axis of the connecting rod 41, no contact occurs between the two side wall cleaning rings 42 and the rotating ring 4, cleaning brushes are sleeved on the side walls of the side wall cleaning rings 42, the cleaning brushes are arranged around the side walls of the side wall cleaning rings 42, and the outer side walls of the cleaning brushes can be attached to the inner walls of the self-cooling inlet pipe 3 and the self-cooling outlet pipe 32.
The diameter of the rotary ring 4 is the same as the diameter of the connecting rod 41, and the diameter of the rotary opening of the rotary ring 4 is the same as the diameter of the rotary connecting end of the connecting rod 41.
The two cleaning wheels 43 are symmetrically arranged about the transverse end central axis of the connecting rod 41, the cleaning wheels 43 are arranged in a protruding scraping wheel structure, the protruding front end section of each protruding scraping wheel is arranged in an inward tilting structure, and the side walls of the cleaning wheels 43 are attached to the inner walls of the self-cooling inlet pipe 3 and the self-cooling outlet pipe 32.
The specific working principle of the invention is as follows:
according to the illustration in fig. 1, the driving end pressure of the known water pump is necessarily lower than the non-driving end pressure (the pump body outlet pressure is 1.5 to 2.0MP, the inlet pressure water column static pressure is 0.5 MPa), namely, the end pressure of the second mechanical seal block 22 is higher than the end pressure of the first mechanical seal block 21, due to the differential water pressure effect of the side wall conduction connection of the self-cooling inlet pipe 3, the self-cooling through pipe 31 and the self-cooling outlet pipe 32, according to the illustration in fig. 2, partial water liquid in the water pump enters through the self-cooling outlet pipe 32, in the entering process, the cleaning wheel 43 is pushed to rotate towards the self-cooling through pipe 31 along the inner pipe of the self-cooling outlet pipe 32, as illustrated in fig. 3, the cleaning wheel 43 at two ends is arranged, after the faster water liquid enters into the self-cooling outlet pipe 32, the self-cooling through pipe 31 and the self-cooling inlet pipe 3, and after the movement is carried out, due to the side wall of the cleaning wheel 43 adopts the structure of the convex scraping wheel, when the water liquid impacts on the cleaning wheel 43, the impact force of the cleaning wheel is partially converted into the two water wheels 43, thus the water is prevented from being worn down by the water pipe when the cleaning wheel 43, and the water is cooled down due to the high water impact condition of the water pump, and the water is prevented from entering the water pipe and the water buffer is cooled;
in the process, the automatic circulating water cooling function of the mechanical seal is realized through the water pressure difference action at the two ends of the water pump 2, meanwhile, the buffering function of cooling water liquid is realized through the structural arrangement of the cleaning wheel 43 by utilizing the action of energy conversion, and the components such as sealing, carbocycle and the like are prevented from being damaged by heating due to no cooling in the high-speed operation working process of the mechanical seal.
Meanwhile, as can be seen from fig. 3 and 5, since the side wall of the cleaning wheel 43 adopts the structure arrangement of the raised scraping wheel, the raised front end section of the raised scraping wheel adopts the inward tilting structure arrangement, the cleaning wheel 43 is pushed to rotate inwards by cooling water, meanwhile, scraping and cleaning of the side wall are realized, since the side wall cleaning ring 42 is fixedly arranged on the side wall of the connecting rod 41, the cleaning brush is sleeved on the side wall of the side wall cleaning ring 42, the cleaning wheel 43 rotates, meanwhile, the side wall cleaning ring 42 cleans the upper end and the lower end of the inner wall of the self-cooling outlet pipe 32 and the inner wall of the self-cooling inlet pipe 3, when the cleaning wheel 43 in the self-cooling outlet pipe 32 moves to collide with the inner wall of the self-cooling pipe 31 along with the water impulse force, the generated vibration effect is generated, dirt in the inner wall of the self-cooling pipe 31 is cleaned under the vibration force and the impulse force of the water, so that the flow rate of the cooling water is reduced, the cooling effect is avoided, and the first elastic rope 35 and the second elastic rope 36 are arranged, when the cleaning wheel 43 does not use, the first elastic rope 35 and the second elastic rope 36 are in the state, and the second elastic rope 36 are kept under the action, and the second elastic rope 35 is kept under the action, and the action of the first elastic rope 35 and the second elastic rope is kept;
in the process, the cleaning wheel 43 and the side wall cleaning ring 42 are structurally arranged, the scraping and brushing cleaning functions of the self-cooling outlet pipe 32 and the inside of the self-cooling inlet pipe 3 are realized by matching with water impact force, and the vibrating and cleaning functions of the inner pipe of the self-cooling through pipe 31 are realized by the collision and vibration actions of the cleaning wheel 43 and the inner pipe of the self-cooling through pipe 31, so that the flow of cooling water in the inner part is ensured under the condition that the guide pipe is not replaced frequently.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. A multi-stage water pump mechanically sealed self-cooling device, comprising:
the water pump comprises a water pump base (1), wherein a water pump (2) is fixedly arranged at the top end of the water pump base (1), a first mechanical seal block (21) is fixedly arranged at the driving end of the water pump (2), and a second mechanical seal block (22) is fixedly arranged at one side, far away from the driving end, of the water pump (2);
the water cooling circulation device is used for performing circulating water cooling on the double-end machine seal and is arranged between the side walls of the first machine seal block (21) and the second machine seal block (22);
the flick cleaning device is used for vibrating and scraping the inner wall of the water cooling circulation device to perform bidirectional cleaning, and is arranged in the water cooling circulation device;
the water cooling circulation device comprises a self-cooling inlet pipe (3), a self-cooling through pipe (31), a self-cooling outlet pipe (32), an inlet limiting block (33), an outlet limiting block (34), a first elastic rope (35) and a second elastic rope (36), wherein the self-cooling inlet pipe (3) is fixedly arranged on the side wall of the first mechanical seal block (21), the self-cooling through pipe (31) is fixedly arranged at the other end of the self-cooling inlet pipe (3), the self-cooling outlet pipe (32) is fixedly arranged between the self-cooling through pipe (31) and the side wall of the second mechanical seal block (22), the inlet limiting block (33) is fixedly arranged at the interface end of the self-cooling inlet pipe (3), the outlet limiting block (34) is fixedly arranged at the interface end of the self-cooling outlet pipe (32), the first elastic rope (35) is fixedly arranged at one end, far away from the inlet limiting block (33), inside the self-cooling inlet pipe (3), and the second elastic rope (36) is fixedly arranged at the side wall of the outlet limiting block (34).
The elastic touch cleaning device comprises a rotating ring (4), a connecting rod (41), a side wall cleaning ring (42) and a cleaning wheel (43), wherein the rotating ring (4) inside a self-cooling outlet pipe (32) is fixedly connected with a second elastic rope (36), the rotating ring (4) inside the self-cooling inlet pipe (3) is fixedly connected with a first elastic rope (35), the connecting rod (41) is in rotating connection with the inner side wall of the rotating ring (4), the side wall cleaning ring (42) is fixedly installed on the side wall of the connecting rod (41), the cleaning wheel (43) is fixedly installed on the side walls at two ends of the connecting rod (41), the self-cooling inlet pipe (3), the self-cooling through pipe (31) and the self-cooling outlet pipe (32) are connected in a penetrating mode, and the self-cooling inlet pipe (3), the self-cooling through pipe (31) and the self-cooling outlet pipe (32) are located on the same horizontal plane.
2. The multistage water pump mechanical seal self-cooling device according to claim 1, wherein the shape of the inlet limiting block (33) is the same as that of the outlet limiting block (34), and the diameter of a through hole of the inlet limiting block (33) and the outlet limiting block (34) is smaller than that of the cleaning wheel (43).
3. The multistage water pump mechanical seal self-cooling device according to claim 1, wherein two side wall cleaning rings (42) are symmetrically arranged about a transverse end central axis of the connecting rod (41), the two side wall cleaning rings (42) are not contacted with the rotating ring (4), cleaning brushes are sleeved on the side walls of the side wall cleaning rings (42), the cleaning brushes are arranged around the side walls of the side wall cleaning rings (42), and the outer side walls of the cleaning brushes can be attached to the inner walls of the self-cooling inlet pipe (3) and the self-cooling outlet pipe (32).
4. The multistage water pump mechanical seal self-cooling device according to claim 1, wherein the diameter of the rotating ring (4) is the same as the diameter of the connecting rod (41), and the diameter of the rotating opening of the rotating ring (4) is the same as the diameter of the rotating connecting end of the connecting rod (41).
5. The multistage water pump mechanical seal self-cooling device according to claim 1, wherein two cleaning wheels (43) are symmetrically arranged about a transverse end central axis of the connecting rod (41), the cleaning wheels (43) are arranged in a protruding scraping wheel structure, a protruding front end section of each protruding scraping wheel is arranged in an inward tilting structure, and the side walls of the cleaning wheels (43) are attached to the inner walls of the self-cooling inlet pipe (3) and the self-cooling outlet pipe (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110932385.5A CN113803243B (en) | 2021-08-13 | 2021-08-13 | Multistage water pump mechanical seal self-cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110932385.5A CN113803243B (en) | 2021-08-13 | 2021-08-13 | Multistage water pump mechanical seal self-cooling device |
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| Publication Number | Publication Date |
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| CN113803243A CN113803243A (en) | 2021-12-17 |
| CN113803243B true CN113803243B (en) | 2023-08-18 |
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| RU18561U1 (en) * | 2001-01-09 | 2001-06-27 | Акционерное общество "Татнефть" | MULTI-STAGE CENTRIFUGAL PUMP |
| CN101769379A (en) * | 2010-03-23 | 2010-07-07 | 南京林业大学 | Active type adaptive control mechanical sealing device and control method |
| CN102536876A (en) * | 2012-01-18 | 2012-07-04 | 合肥三益江海泵业有限公司 | Water pump rotating shaft supporting device for multistage centrifugal pump |
| JP2019209256A (en) * | 2018-06-05 | 2019-12-12 | Ｊｆｅエンジニアリング株式会社 | Pipe cleaner |
| CN213758043U (en) * | 2020-11-17 | 2021-07-23 | 浙江龙力科技股份有限公司 | Intelligent multifunctional carpet dust collector capable of spraying cleaning agent liquid |
| CN216812288U (en) * | 2021-08-13 | 2022-06-24 | 华能桐乡燃机热电有限责任公司 | Multistage water pump machine seals from cooling device |
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2021
- 2021-08-13 CN CN202110932385.5A patent/CN113803243B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU18561U1 (en) * | 2001-01-09 | 2001-06-27 | Акционерное общество "Татнефть" | MULTI-STAGE CENTRIFUGAL PUMP |
| CN101769379A (en) * | 2010-03-23 | 2010-07-07 | 南京林业大学 | Active type adaptive control mechanical sealing device and control method |
| CN102536876A (en) * | 2012-01-18 | 2012-07-04 | 合肥三益江海泵业有限公司 | Water pump rotating shaft supporting device for multistage centrifugal pump |
| JP2019209256A (en) * | 2018-06-05 | 2019-12-12 | Ｊｆｅエンジニアリング株式会社 | Pipe cleaner |
| CN213758043U (en) * | 2020-11-17 | 2021-07-23 | 浙江龙力科技股份有限公司 | Intelligent multifunctional carpet dust collector capable of spraying cleaning agent liquid |
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| CN113803243A (en) | 2021-12-17 |
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