CN103899542A - Series-parallel connection centrifugal pump - Google Patents
Series-parallel connection centrifugal pump Download PDFInfo
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- CN103899542A CN103899542A CN201410150717.4A CN201410150717A CN103899542A CN 103899542 A CN103899542 A CN 103899542A CN 201410150717 A CN201410150717 A CN 201410150717A CN 103899542 A CN103899542 A CN 103899542A
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- runner
- flow channel
- spool
- parallel connection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/10—Multi-stage pumps with means for changing the flow-path through the stages, e.g. series-parallel, e.g. side loads
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Abstract
The invention belongs to the field of centrifugal pumps and particularly relates to a series-parallel connection centrifugal pump which has the flow channel series-parallel connection switching capacity. The series-parallel connection centrifugal pump comprises a pump body and a pump shaft. The pump shaft is provided with two impeller parts, and a first cavity channel and a second cavity channel are formed in a pump cavity corresponding to the two impeller parts. A first bypass flow channel, a second bypass flow channel, a first liquid outlet flow channel and a second liquid outlet flow channel are formed in the pump body, wherein the first bypass flow channel and the second bypass flow channel are used for communicating an outlet of an external liquid inlet pipeline and an inlet of the first cavity channel as well as the outlet of the external liquid inlet pipeline and an inlet of the second cavity channel respectively, and the first liquid outlet flow channel and the second liquid outlet flow channel are used for communicating an inlet of the external liquid outlet pipeline and an outlet of the first cavity channel as well as the inlet of the external liquid outlet pipeline and an outlet of the second cavity channel. A branch flow channel is further arranged in the pump cavity, one end of the branch flow channel is communicated with a liquid inlet of the second cavity channel, and the other end of the branch flow channel is communicated with the first liquid outlet flow channel to form a three-way joint. The series-parallel connection centrifugal pump further comprises a switching part, a switching assembly is arranged at the second liquid outlet flow channel, and the switching assembly and the switching part are in electric linkage or mechanical linkage. Due to the linkage structure, the series-parallel connection centrifugal pump is reasonable and practical in structure, long in service life and reliable and stable in work.
Description
Technical field
The invention belongs to centrifugal pump field, be specifically related to a kind of series parallel connection centrifugal pump that has runner series parallel connection switching capability that possesses.
Background technique
Series parallel connection centrifugal pump belongs to the one in all polymorphic types of centrifugal pump, is widely used in the field such as fire-fighting and boats and ships.The use original intention of series parallel connection centrifugal pump is in order to solve the technical problem that conventional centrifugal pump lift was short, flow is little in the past; It,, by pump body ready-portioned runner in advance, realizes its series-parallel function with the coordination shunting action of one-way valve and rotary switch valve.But the current one-way valve structures that is applied to above-mentioned centrifugal pump, is affected by its Environmental Conditions and even its usability, is all the structure of similar hinged door leaf formula, and adds rubber pad to realize its airtight performance at the closing face place of its door leaf shape plate body; On the one hand, for guaranteeing the keying sensitivity of one-way valve, rubber pad is all its plate body closing face place of being fixed on of lax shape conventionally, thereby while guaranteeing that hydraulic pressure impacts, liquid medium can " fast " filled rubber pad and its plate body gap, and produce hydraulic thrust and realize closing of runner; But, the actual working environment of one-way valve itself, usually needing again to realize it frequently opens and closes, while realizing its keying at the long-time frequent shock runner of one-way valve plate body, soft rubber pad very easily produces that breakage is torn and even the situation such as self falling, thereby generation leakage problem, affects the efficiency of actual of pump, this is also that its working life is shorter and safeguard main cause frequently; On the other hand, because one-way valve and rotary switch valve are moving part, even if itself does not use, line service is still essential, now just need attendant all to dismantle for entrance point and the outlet end of pump, realization that can be is one by one for the maintenance purpose of above-mentioned each switch part, and its dismounting formality is numerous and diverse be can't bear, workload is huge, thereby has affected greatly attendant's actual maintenance efficiency.In addition, its one-way valve is as hinge door leaf formula structure, its door leaf formula shape plate body not only possesses uncontrollability in the time of work, also in the time that opening and closing, reality inevitably frequently and between the pump housing produces impingement phenomenon simultaneously, its operating noise is very big, and be no matter submarine etc. while needing ships and light boats field that emphasis unvoices, being still applied to normal common ship working environment, the noise problem that conventional centrifugal pump itself exists has all limited its practical ranges greatly.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of series parallel connection centrifugal pump rational in infrastructure and practical is provided, its long service life and reliable and stable work, operating noise also can be greatly improved.
For achieving the above object, the present invention has adopted following technological scheme:
A kind of series parallel connection centrifugal pump, comprises possessing have the pump housing of pump chamber and be arranged in the pump shaft in pump housing pump chamber; On described pump shaft, establish impeller portion, impeller portion is that two and pump chamber place correspondence offer first, second cavity independent of each other for holding two impeller portions; On the pump housing, be provided with the first feed liquor runner for being communicated with outside feed liquor pipeline and the first cavity import, and be communicated with respectively first, second fluid runner of outside fluid pipeline and the outlet of first, second cavity; In pump chamber, be also furnished with branch's runner, branch's runner one end is communicated with the second cavity, and the other end is communicated with the first fluid runner place and in its connectivity part formation threeway node, above-mentioned threeway Nodes is provided with the switch part for playing three-way cock effect; Series parallel connection centrifugal pump also comprises the collateral branch's runner that is communicated with outside feed liquor pipeline and the second cavity, and runner place of described collateral branch is provided with the switch block opening and closing for controlling its runner; Between described switch block and switch part, possess electric shaft or mechanical linkage relation, when switch part close fork runner, switch block in opened condition; When switch part is closed one section of runner between threeway node and the outside fluid pipeline on the first fluid runner, switch block is closed condition.
Described series parallel connection centrifugal pump comprises rotary valve, and described rotary valve profile is two ends carefully and the thick multidiameter shaft shape in stage casing, and its diameter shaft part small in ends forms the valve rod of rotary valve, and its stage casing major diameter shaft part forms the spool of rotary valve; Spool is axially postponed and simultaneously through collateral branch's runner and the setting of described threeway Nodes along it, the part valve section that is positioned at collateral branch's runner on spool forms the switch block of collateral branch's runner, and the part valve section that is positioned at threeway Nodes on branch's runner on spool forms switch part.
One end of described collateral branch runner is communicated with outside liquid inlet pipe way outlet, and the other end is communicated on branch's runner.
Described collateral branch runner comprises that profile is the parallel flow channel of " U " word shape, and branch's runner and the first fluid runner entirety form " h " word shape flow channel, and the liquid of " h " word shape flow channel stream joint place forms above-mentioned threeway node; Parallel and both openings are towards arranging in the same way each other for described " h " word shape flow channel and the parallel flow channel of " U " word shape, and between " h " word shape flow channel and the parallel flow channel of " U " word shape, connection is furnished with connecting tube; Vertical " h " word shape flow channel of connecting tube axis place layout; The be placed in two-end-point place of parallel flow channel of " U " word shape of the liquid entering hole of the liquid outlet of connecting tube and outside feed liquor pipeline, the other end of connecting tube is positioned at runner place of branch.
On connecting tube and parallel flow channel connectivity points " U " word shape with on collateral branch's runner for being communicated with between the entrance point of outside feed liquor pipeline.
The parallel flow channel place that profile on collateral branch's runner is " U " word shape is outward extended with body, and body is outwards postponed and as the extension of collateral branch's runner and be communicated in the setting of outside feed liquor pipeline.
Take the corresponding switch block of spool place section as the first spool section, the corresponding switch part of spool place section is the second spool section, spool is in the first spool section and the intersegmental intermediate seal section that is also furnished with of the second spool, and intermediate seal section seals and isolates first, second spool section place liquid chunnel setting.
First, second spool Duan Shangjun offers gap slot, described two gap slots all along spool be radially arranged with and between the two breach towards reversed arrangement.
Intermediate seal section circumferentially offers annular groove at its periphery wall place along it.
Described rotary valve also comprises and is arranged in the handle part at valve rod one end place and for limiting the limited part of handle part angle of swing.
Described impeller portion is receded disk impeller, on one section of pump shaft between two impeller portions, be furnished with the slider for isolating both first, second cavities of place, and two impeller portions are all being arranged in the pump housing of face symmetry with vertical pump shaft axis place plane with first, second cavity shape profile.
Beneficial effect of the present invention is:
1), abandoned traditional dependence that only relies on twisting type independently hydraulic pressure open and close one-way valve and realize collateral branch runner and be communicated with, and many basic structural imperfection such as the working life and even the operating noise etc. that cause, by adopting electric shaft or the mechanical linkage structure between switch part and switch block, thereby guarantee the interlock remote control effect of the switch part at switch part and runner place of collateral branch; By determining both interaction relations, once switch block action, switch part produces servo-actuated action thereupon, and its controllability is obviously significantly better than conventional construction; Depend on the combined operation of switch block due to switch part itself simultaneously, therefore itself or still adopt sealing gasket, but on the valve that is fixed in one-way valve that it more can be fitted, or its setting is to the structures such as rotary valve, now its physical seal performance and controllability obviously also can be greatly improved, no matter adopt which kind of mode, actual working service and even its working life of whole valve body and even the whole pump housing all can greatly be taken on a new look, and its working stability is reliable and can guarantee its utilization efficiency.
2), as the application's optimized project, between switch part herein and switch block, preferably realize with mechanical linkage; In other words, collateral branch's runner is now no longer traditional fluid path structure in the pump housing that is arranged in completely, but be communicated with outside feed liquor pipeline after the pump housing of being postponed for outer (also as the body portion of extension), its the other end directly with branch runner between affixed connection, thereby make to be " U " word shape parallel fluid channels being arranged in parallel between its section of generation and branch's runner, finally for directly wearing of multidiameter shaft shape spool provides possibility.Because spool directly wears and realize the synchronous on-off function for the switch part on threeway node and collateral branch's runner on branch's runner, by the valve opening between reasonable Arrangement parallel fluid channels and branch's runner and on spool or valve pool position, can realize the mode of operation of " core is dual-purpose "; Also: in the time of switch part place valve section close fork runner on spool, the switch block place valve section on spool is channel status; And switch block place valve section on spool while being channel status, the switch part place valve section on spool should be closed one section of flow channel between threeway node and the outside fluid pipeline on the first fluid runner; Its interlock is reliable and stable, obviously more easy than tradition interlock mode in the operation of a rod-type.
3), in fact, the gap slot of offering in first, second spool section, its vallecular cavity with time must be to design as being communicated with the flow channels of respective channels, and its vallecular cavity relatively, its bottom land and even cell wall are to arrange as cutting off adjacent lanes; Two gap slots towards reversed arrangement, specify the keying effect of runner thereby can better realize in the time of Spool rotating.The project organization of the annular groove in intermediate seal section, to consider in use, the minimizing spool that not only can try one's best and the real surface area of contact of corresponding fitting surface, thereby make the spool when rotated can be more laborsaving, in its annular groove, arrange after seals and other component simultaneously, also can play the effect of part sealing and support spool, achieve many things at one stroke.
4), as for the parallel flow channel of " U " word shape on collateral branch's runner and the relative position relation of branch's runner and the first fluid runner entirety formation " h " word shape flow channel, the valve core structure that is the application can be arranged successful optimal condition, by both connecting tube that is arranged in parallel and sets between the two, thereby realize the liquid stream circulation between two runners; By be set to spool wear wear passage, in the time of assembling, also can directly collateral branch's runner, branch's runner and the first fluid runner be directly set to single piece, not only more convenient its practical set, even because each moving part is all positioned in above-mentioned single piece, while maintenance, can not need the entrance point of pump to check, and directly by the above-mentioned single piece of dismounting, can realize the overall maintenance effects for each runner, whole dismounting operation reduction is general, workload rapid drawdown, is conducive to realize high efficiency and safeguards.
5), the setting of the limited part on rotary valve is very necessary, this is because of the valve core structure for the application, its entirety is still the corresponding keying that the correct centering that extremely relies on gap slot is realized its path, once its angle excursion is excessive, unavoidably has leakage phenomenon.By effective cooperation of handle with sleeve and limited part, guarantee its working stability in the time of real work herein, finally for its follow-up normal reliable work provides premise.
Accompanying drawing explanation
Fig. 1 is perspective view of the present invention;
Fig. 2 is that the structure of Fig. 1 is disassembled and configuration state figure;
Fig. 3 and Fig. 5 are that the liquid stream of the present invention under series operation state flows to unfolded drawing;
Fig. 4 is that the valve body at the rotary valve under Fig. 3 working state " h " of living in word shape flow channel place turns to figure;
Fig. 6 is that the valve body at the parallel flow channel place of the rotary valve under Fig. 5 working state " U " of living in word shape turns to figure;
Fig. 7 and Fig. 9 are that the liquid stream of the present invention under parallel operation state flows to unfolded drawing;
Fig. 8 is that the valve body at the rotary valve under Fig. 7 working state " h " of living in word shape flow channel place turns to figure;
Figure 10 is that the valve body at the parallel flow channel place of the rotary valve under Fig. 9 working state " U " of living in word shape turns to figure;
Figure 11 is the overall structure schematic diagram of rotary valve and outside respective housings;
Figure 12 is the section of structure of Figure 11;
Figure 13 is the structural perspective of rotary valve.
The corresponding each component names of number in the figure institute is as follows:
The outside fluid runner of the outside feed liquor runner of A-B-
10-first cavity 11-first feed liquor runner 12-the first fluid runner
20-second cavity 22-the second fluid runner 30-branch runner
The runner 41-of 40-collateral branch body 42-connecting tube 50-rotary valve
51-first spool section 52-the second spool section 53-intermediate seal section 531-annular groove
54-handle part 55-limited part
Embodiment
For ease of understanding, do following description in conjunction with Fig. 1-13 pair concrete assembly of the present invention and workflow herein:
The present invention is by adopting the rotary valve formula structure as shown in Fig. 1-13, thereby realize the operation object of " valve two is controlled ", when actual use, control the angle of swing of the first spool section 51 and the second spool section 52 by operation handle with sleeve simultaneously, thereby play the running of pumps in series parallel connection object with respect to the pump housing; Like this, on the one hand, position, switch part place that originally cannot direct labor's manipulation, by the spool institute integrative control of same control switch assembly, controllability is stronger, and working stability and reliability all can larger assurances, simultaneously also to producing Beneficial Effect its actual life; On the other hand, space by each runner relative position is arranged, thereby guarantee the installing effect of spool, collateral branch's runner 40, branch's runner 30 and the first fluid runner 11 so be all moved into the outlet end place of the pump housing connecting tube 42 and communicate with each other after form single piece, carry out extension connection with body 41 again, when maintenance, only need tear delivery side of pump end place parts open, and no longer need to dismantle the entrance point of the pump housing, its dismounting is safeguarded obviously more convenient.In addition, because the present invention relies on spool and the rotation between corresponding fitting surface to coordinate to realize the keying of corresponding runner, than the traditional sealing gasket structure that must laxly install, its physical seal is obviously stronger, and its operating noise and all can effectively being guaranteed working life.
When the present invention is in series operation state lower time, as shown in Fig. 3-6: now rotate rotary valve, make the first spool section 51 on spool as shown in Figure 5 in closed circuit state, collateral branch's runner 40 is closed, and it is relative, 52 of the second spool sections on spool as shown in Figure 3 close outside fluid pipeline entrance and the internodal one section of liquid chunnel of threeway on the first fluid runner 12, the liquid medium now being flowed out by the first fluid runner only can produce mobile by branch's runner 30.
When pump housing work, liquid medium is through the entrance point (being also outside feed liquor pipeline A) of pump, directly enter the impeller portion at the first cavity 10 places, enter the first fluid runner 12 from this impeller portion liquid medium preliminary with pressure out through the first cavity 10, because the second spool section 52 has been closed outside fluid pipeline entrance and the internodal one section of liquid chunnel of threeway on the first fluid runner 12, liquid medium now can only directly flow into the second cavity 20 by the first fluid runner 12 through branch's runner; Liquid medium carries out after secondary pressurized in the second cavity 20, outside the second fluid runner 22 is discharged pump housing outlet end (being outside fluid pipeline B).
When the present invention is in parallel running state lower time, as shown in Fig. 7-10: now rotate rotary valve 50, make the first spool section 51 on spool in channel status, collateral branch's runner 40 is communicated with, and it is relative, 52 of the second spool sections on spool are only communicated with the first fluid runner 11 and outside fluid pipeline entrance, and the liquid medium being flowed out by the first fluid runner 11 is stopped by the second spool section 52 and no longer flows into branch's runner 30.
When pump housing work, liquid medium is through the entrance point (being also outside feed liquor pipeline A) of pump, now liquid medium is divided into two-part flow path, part liquid medium still directly enters the impeller portion at the first cavity 10 places, enter the first fluid runner 12 from this impeller portion liquid medium with pressure out through the first cavity 10, because branch's runner 30 entrances of its threeway Nodes are now blocked by spool, liquid medium now directly by the first fluid runner 12 through outside fluid pipeline efflux pump body, specifically as shown in Figure 7; And another part liquid medium, via the body 41 collateral branch's runner 40 that circulates, flow into the connecting tube 42 of branch's runner 30 in branch's runner 30 through being communicated with collateral branch's runner 40 again, finally flow into again in the second cavity 20, and impeller portion in the second cavity 20 realizes liquid medium pressurization, thereby flow into pump housing outlet end and excavationg pump is external by the second fluid runner 22, this liquid stream runner can be with reference to shown in figure 3.
Certainly, for the spinning movement of rotary valve 50, both can be by having carried out manual operation by manually-operable handle with sleeve also aforementioned handle part 54 when practical operation, also can be by drive end input shaft and swing hydraulic pressure cylinder being set to realize remote auto control, Spool rotating angle is located by limited part 55, finally to realize the integrated operation of rotary valve, just repeat no longer one by one herein.
Claims (10)
1. a series parallel connection centrifugal pump, comprises possessing have the pump housing of pump chamber and be arranged in the pump shaft in pump housing pump chamber; On described pump shaft, establish impeller portion, impeller portion is that two and pump chamber place correspondence offer first, second cavity independent of each other (10,20) for holding two impeller portions; It is characterized in that: on the pump housing, be provided with the first feed liquor runner (11) for being communicated with outside feed liquor pipeline and the first cavity (10) import, and be communicated with respectively first, second fluid runner (12,22) of outside fluid pipeline and first, second cavity (10,20) outlet; In pump chamber, be also furnished with branch's runner (30), branch's runner (30) one end is communicated with the second cavity (20), and the other end is communicated with, and the first fluid runner (12) is located and in its connectivity part formation threeway node, above-mentioned threeway Nodes is provided with the switch part for playing three-way cock effect; Series parallel connection centrifugal pump also comprises the collateral branch's runner (40) that is communicated with outside feed liquor pipeline and the second cavity (20), and described collateral branch runner (40) locates to be provided with the switch block opening and closing for controlling its runner; Between described switch block and switch part, possess electric shaft or mechanical linkage relation, when switch part close fork runner (30), switch block in opened condition; When switch part is closed one section of runner between threeway node and the outside fluid pipeline on the first fluid runner (12), switch block is closed condition.
2. series parallel connection centrifugal pump according to claim 1, it is characterized in that: described series parallel connection centrifugal pump comprises rotary valve (50), described rotary valve (50) profile is two ends carefully and the thick multidiameter shaft shape in stage casing, its diameter shaft part small in ends forms the valve rod of rotary valve (50), and its stage casing major diameter shaft part forms the spool of rotary valve (50); Spool is axially postponed and arranges through collateral branch's runner (40) and described threeway Nodes simultaneously along it, the part valve section that is positioned at collateral branch's runner (40) on spool forms the switch block of collateral branch's runner (40), and the part valve section that is positioned at the upper threeway Nodes of branch's runner (30) on spool forms switch part.
3. series parallel connection centrifugal pump according to claim 2, is characterized in that: one end of described collateral branch runner (40) is communicated with outside liquid inlet pipe way outlet, and the other end is communicated on branch's runner (30).
4. according to the series parallel connection centrifugal pump described in claim 2 or 3, it is characterized in that: described collateral branch runner (40) comprises that profile is the parallel flow channel of " U " word shape, branch's runner (30) forms " h " word shape flow channel with the first fluid runner (12) entirety, and the liquid of " h " word shape flow channel stream joint place forms above-mentioned threeway node; Parallel and both openings are towards arranging in the same way each other for described " h " word shape flow channel and the parallel flow channel of " U " word shape, and between " h " word shape flow channel and the parallel flow channel of " U " word shape, connection is furnished with connecting tube (42); Vertical " h " word shape flow channel of connecting tube (42) axis place layout; The be placed in two-end-point place of parallel flow channel of " U " word shape of the liquid outlet of connecting tube (60) and the liquid entering hole of outside feed liquor pipeline, the other end of connecting tube (42) is positioned at branch's runner (30) and locates.
5. series parallel connection centrifugal pump according to claim 4, it is characterized in that: the parallel flow channel place that the profile on collateral branch's runner (40) is " U " word shape is outward extended with body (41), body (41) is outwards postponed and as the extension of collateral branch's runner (40) and be communicated in the setting of outside feed liquor pipeline.
6. according to the series parallel connection centrifugal pump described in claim 2 or 3, it is characterized in that: take the corresponding switch block of spool place section as the first spool section (51), the corresponding switch part of spool place section is the second spool section (52), spool is also furnished with intermediate seal section (53) between the first spool section (51) and the second spool section (52), intermediate seal section (53) seal and isolate first, second spool section (51,52) place liquid chunnel arrange.
7. series parallel connection centrifugal pump according to claim 6, is characterized in that: first, second spool section all offers gap slot on (51,52), described two gap slots all along spool be radially arranged with and between the two breach towards reversed arrangement.
8. series parallel connection centrifugal pump according to claim 6, is characterized in that: intermediate seal section (53) circumferentially offers annular groove (531) at its periphery wall place along it.
9. according to the series parallel connection centrifugal pump described in claim 2 or 3, it is characterized in that: described rotary valve (50) also comprises and is arranged in the handle part (54) at valve rod one end place and for limiting the limited part (55) of handle part (54) angle of swing.
10. according to the series parallel connection centrifugal pump described in claim 1 or 2 or 3, it is characterized in that: described impeller portion is receded disk impeller, on one section of pump shaft between two impeller portions, be furnished with the slider for isolating first, second cavity of both places (10,20), and two impeller portions are all being arranged in the pump housing of face symmetry with vertical pump shaft axis place plane with first, second cavity (10,20) shape profile.
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| CN201410150717.4A CN103899542B (en) | 2014-04-15 | 2014-04-15 | A kind of series parallel connection centrifugal pump |
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| CN201410150717.4A CN103899542B (en) | 2014-04-15 | 2014-04-15 | A kind of series parallel connection centrifugal pump |
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| CN103899542B CN103899542B (en) | 2016-04-27 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104895803A (en) * | 2015-07-01 | 2015-09-09 | 吉首大学 | Double-centrifugal-pump device free in switching series connection and parallel connection |
| CN104895805A (en) * | 2015-07-01 | 2015-09-09 | 吉首大学 | Double-centrifugal-pump device convenient and quick in switching series connection and parallel connection |
| CN104895802A (en) * | 2015-07-01 | 2015-09-09 | 吉首大学 | Double-centrifugal-pump device free in serial connection and parallel connection switching |
| CN104895804A (en) * | 2015-07-01 | 2015-09-09 | 吉首大学 | Double-centrifugal-pump device convenient in serial connection and parallel connection switching |
| CN104922951A (en) * | 2015-07-08 | 2015-09-23 | 吉首大学 | Pump-circulation anti-blocking type efficient basic magnesium carbonate filter pressing device |
| CN105952653A (en) * | 2015-03-09 | 2016-09-21 | 格兰富控股联合股份公司 | Circulation pump unit |
| US10072644B2 (en) | 2016-08-10 | 2018-09-11 | Kickstart International, Inc. | Portable alternative-energy powered pump assembly |
| US10662961B2 (en) | 2017-11-02 | 2020-05-26 | International Business Machines Corporation | Pump with integrated bypass mechanism |
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| CN105952653A (en) * | 2015-03-09 | 2016-09-21 | 格兰富控股联合股份公司 | Circulation pump unit |
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| CN104895804A (en) * | 2015-07-01 | 2015-09-09 | 吉首大学 | Double-centrifugal-pump device convenient in serial connection and parallel connection switching |
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| CN104922951A (en) * | 2015-07-08 | 2015-09-23 | 吉首大学 | Pump-circulation anti-blocking type efficient basic magnesium carbonate filter pressing device |
| US10072644B2 (en) | 2016-08-10 | 2018-09-11 | Kickstart International, Inc. | Portable alternative-energy powered pump assembly |
| US10968902B2 (en) | 2016-08-10 | 2021-04-06 | Kickstart International, Inc. | Portable alternative-energy powered pump assembly |
| US11118588B2 (en) | 2017-08-29 | 2021-09-14 | Cornell Pump Company | Dual pump system |
| US10662961B2 (en) | 2017-11-02 | 2020-05-26 | International Business Machines Corporation | Pump with integrated bypass mechanism |
| CN111207080A (en) * | 2020-01-22 | 2020-05-29 | 陈科 | Chemical pump with shaft-split middle-opening conveniently-disassembled structure |
| CN111207080B (en) * | 2020-01-22 | 2020-12-15 | 乐清市芮易经济信息咨询有限公司 | Chemical pump with shaft-split middle-opening conveniently-disassembled structure |
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| CN103899542B (en) | 2016-04-27 |
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Address after: Shuangfeng Economic Development Zone, Hefei city of Anhui Province Jin Huai road 231131 No. 6 Applicant after: HEFEI HUASHENG VALVE LIMITED BY SHARE LTD. Address before: Shuangfeng Economic Development Zone, Hefei city of Anhui Province Jin Huai road 231131 No. 6 Applicant before: Hefei Huasheng Pumps Valves Co., Ltd. |
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