CN110905828A - Water storage rubber dam pump station - Google Patents
Water storage rubber dam pump station Download PDFInfo
- Publication number
- CN110905828A CN110905828A CN201911370176.5A CN201911370176A CN110905828A CN 110905828 A CN110905828 A CN 110905828A CN 201911370176 A CN201911370176 A CN 201911370176A CN 110905828 A CN110905828 A CN 110905828A
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- Prior art keywords
- opening
- control valve
- pump
- rubber dam
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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
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/12—Combinations of two or more pumps
- F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/005—Deformable barrages or barrages consisting of permanently deformable elements, e.g. inflatable, with flexible walls
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
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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
- F04D9/00—Priming; Preventing vapour lock
- F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a water storage type rubber dam pump station, which is characterized in that: the motor comprises a housin, be equipped with the pump package in the casing, be equipped with the opening with the pump package intercommunication on the casing, the pump package includes a plurality of vacuum pumps and a plurality of centrifugal pumps, the opening is equipped with threely, is first opening, second opening and third opening respectively, be connected through first being responsible for between first opening and the second opening, the third opening is connected with the second and is responsible for, vacuum pump and centrifugal pump setting are responsible for between first being responsible for and the second. Through set up the vacuum pump in pump station inside, make and fill the rubber dam or carry out the vacuum diversion earlier before the drainage, the water pump starts very fast, moves comparatively safe and reliable, and the pump station is equipped with supporting external control system, easy operation, degree of automation is high.
Description
Technical Field
The invention relates to the technical field of rubber dam engineering.
In particular to a water storage type rubber dam pump station.
Background
The rubber dam is a bag-type water-retaining dam made up by using high-strength synthetic fibre fabric as stress skeleton, coating rubber layer as protective layer, making it into adhesive tape, anchoring it on the base plate to form a closed dam bag and using water (gas) to inflate it by means of charging and discharging pipeline. The dam top can overflow, the dam height can be adjusted according to needs, and the upstream water level is controlled, so that the benefits of irrigation, power generation, shipping, flood control, moisture blocking and the like are achieved.
The pump station is a device capable of providing hydraulic power and pneumatic power with certain pressure and flow, and is called pump and pump station engineering in engineering. The water inlet, the water outlet, the pump room and other buildings of the drainage and irrigation pump station are collectively called. The existing rubber dam has no reliable matched pump station. Improvements are now made to this problem.
Disclosure of Invention
The invention aims to overcome the defects of the traditional technology and provide the water storage type rubber dam pump station aiming at the defects of the prior art, which can realize vacuum water diversion, is safer and more reliable, has high automation degree, can be simultaneously suitable for a manual mode and an automatic mode, and is simple to operate.
The aim of the invention is achieved by the following technical measures: the utility model provides a retaining formula rubber dam pump station which characterized in that: the motor comprises a housin, be equipped with the pump package in the casing, be equipped with the opening with the pump package intercommunication on the casing, the pump package includes a plurality of vacuum pumps and a plurality of centrifugal pumps, the opening is equipped with threely, is first opening, second opening and third opening respectively, be connected through first being responsible for between first opening and the second opening, the third opening is connected with the second and is responsible for, vacuum pump and centrifugal pump setting are responsible for between first being responsible for and the second.
The subassembly of pump station all sets up in the casing, receive the protection of casing, and through connecting two openings rubber dam, external water source is connected to an opening, the work of the inside pump package of control and the water and the drainage that fill of realizing rubber dam, no matter fill water or drainage to rubber dam, at first open the inside vacuum pump of pump station, realize the vacuum diversion, the vacuum diversion is applicable to big type water pump suction pipe diameter great, be not convenient for install the bottom valve or the too big diversion time overlength's of the volume of watering the condition, the water pump starts sooner, the operation is comparatively safe and reliable. The defect that the pump station structure is deep underground due to self-filling water can be avoided.
As a preferred scheme, the centrifugal pumps are four, the four centrifugal pumps are connected with the first main pipe through first branch pipes, and the four first branch pipes are respectively provided with a first control valve, a second control valve, a third control valve and a fourth control valve.
As a preferable scheme, four vacuum pumps are provided, the four vacuum pumps are connected with the second main pipe through second branch pipes, and a twelfth control valve, a thirteenth control valve, a fourteenth control valve and a fifteenth control valve are respectively arranged on the four second branch pipes.
As a preferable scheme, a third branch pipe is arranged between the first main pipe and the second main pipe, and an eighth control valve is arranged on the third branch pipe.
As a preferable scheme, two ends of the third branch pipe are respectively located at positions close to the second port and the third port, a fifth control valve is arranged at a portion, close to the first port, of the first main pipe, a sixth control valve and a seventh control valve are arranged at a portion, close to the second port, of the first branch pipe, and the sixth control valve and the seventh control valve are respectively arranged on two sides of a connection point of the third branch pipe and the first main pipe.
Preferably, a ninth control valve is arranged at the position, close to the third port, of the second main pipe.
As a preferable scheme, a water tank is arranged in the shell, one centrifugal pump corresponds to one vacuum pump, and each group is arranged in one water tank.
As a preferred scheme, the shell is internally provided with a vacuum pump, the vacuum pump is communicated with the four water tanks through a fourth branch pipe, and the fourth branch pipe is provided with a sixteenth control valve.
As a preferred scheme, first opening and third opening intercommunication rubber dam, the external water source of second opening intercommunication, the one end of first being responsible for is worn out from first opening, and the other end is worn out from the second opening, the one end that the second was responsible for is sealed, and the other end is worn out from the third opening.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the advantages that:
the invention provides a water storage type rubber dam pump station, which is characterized in that a vacuum pump is arranged in the pump station, so that vacuum water diversion is carried out before water filling or water draining of a rubber dam, the water pump is started quickly, the operation is safe and reliable, and the pump station is provided with a matched external control system, so that the operation is simple and the automation degree is high.
The invention is further described with reference to the following figures and detailed description.
Drawings
FIG. 1 is a schematic structural diagram of a water storage type rubber dam pump station.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example (b): as shown in the attached figure 1, the impounding type rubber dam pump station is characterized in that: including casing 17, be equipped with the pump package in the casing 17, be equipped with the opening with the pump package intercommunication on the casing 17, the pump package includes a plurality of vacuum pumps 26 and a plurality of centrifugal pumps 27, the opening is equipped with threely, is first opening 28, second opening 29 and third opening 30 respectively, connect through first person in charge 18 between first opening 28 and the second opening 29, third opening 30 is connected with the second and is responsible for 19, vacuum pump 26 and centrifugal pump 27 set up and are responsible for between 18 and the second of first person in charge 19.
The subassembly of pump station all sets up in casing 17, receive casing 17's protection, and through connecting two openings rubber dam, external water source is connected to an opening, the work of the inside pump package of control and realize filling and the drainage of rubber dam, no matter fill water or drainage to rubber dam, at first open the inside vacuum pump 26 of pump station, realize the vacuum diversion, the vacuum diversion is applicable to large-scale water pump suction pipe diameter great, be not convenient for install the bottom valve or the too big diversion time overlength's of the volume of watering condition, the water pump starts very fast, the operation is comparatively safe and reliable. The defect that the pump station structure is deep underground due to self-filling water can be avoided.
In this embodiment, four centrifugal pumps 27 are provided, four centrifugal pumps 27 are connected to the first main pipe 18 through the first branch pipes 21, and the four first branch pipes 21 are respectively provided with a first control valve 1, a second control valve 2, a third control valve 3, and a fourth control valve 4. The four centrifugal pumps 27 are respectively connected with the first main pipe 18 through the corresponding first branch pipes 21, the centrifugal pumps 27 are used for pumping water and pumping water out of the pump station through the first branch pipes 21 and the first main pipe 18 in sequence, each first branch pipe 21 is correspondingly provided with a control valve for controlling opening and closing, and the pumping water is controlled by controlling the opening and closing of each control valve and each centrifugal pump 27.
In this embodiment, correspondingly, there are four vacuum pumps 26, four vacuum pumps 26 are connected to the second main pipe 19 through the second branch pipes 22, there are also four second branch pipes 22, and the twelfth control valve 12, the thirteenth control valve 13, the fourteenth control valve 14 and the fifteenth control valve 15 are respectively arranged on the four second branch pipes 22. The four vacuum pumps 26 are respectively connected with the second main pipe 19 through the corresponding second branch pipes 22, the vacuum pumps 26 are used for forming a vacuum environment in the pump station, before water is drained or filled at each time, air in the pump station is pumped out, vacuum water diversion is realized, the air is pumped out from the pump station through the second branch pipes 22 and the second main pipe 19 in sequence, a control valve for controlling opening and closing is correspondingly arranged on each second branch pipe 22, and the vacuum is controlled by controlling the opening and closing of each control valve and each vacuum pump 26.
As shown in fig. 1, a third branch pipe 20 is arranged between the first main pipe 18 and the second main pipe 19, and an eighth control valve 8 is arranged on the third branch pipe 20. The opening and closing of the third branch pipe 20 is controlled by controlling the opening and closing of the eighth control valve 8, thereby controlling the communication between the first main pipe 18 and the second main pipe 19.
The two ends of the third branch pipe 20 are respectively located at positions close to the second through opening 29 and the third through opening 30, the part of the first main pipe 18 close to the first through opening 28 is provided with a fifth control valve 5, the part of the first branch pipe 21 close to the second through opening 29 is provided with a sixth control valve 6 and a seventh control valve 7, and the sixth control valve 6 and the seventh control valve 7 are respectively arranged at two sides of the connecting point of the third branch pipe 20 and the first main pipe 18. The fifth control valve 5 controls the communication between the first main pipe 18 and the first port 28, and the sixth control valve 6 and the seventh control valve 7 controls the communication between the first main pipe 18 and the second port 29 and the communication between the first main pipe 18 and the second main pipe 19. A ninth control valve 9 is arranged on the second main pipe 19 near the third port 30. The ninth control valve 9 controls the communication of the second main pipe 19 and the third port 30.
As shown in fig. 1, the casing 17 is provided inside with water tanks 25, one of the centrifugal pumps 27 and one of the vacuum pumps 26 in one-to-one correspondence, and each set is provided in one water tank 25. A vacuum pump 26 is further arranged in the shell 17, the vacuum pump 26 is communicated with four water tanks 25 through a fourth branch pipe 23, and a sixteenth control valve 16 is arranged on the fourth branch pipe 23. The vacuum pump 26 pumps water in the pump station into the fourth branch pipe 23, the fourth branch pipe 23 connects the water tanks 25, the sixteenth control valve 16 controls the opening and closing of the vacuum pump 26 to the water tanks 25, and the vacuum pump 26 enables the inside of the pump station and the outside of the water tanks to be in a vacuum state when working.
First opening 28 and third opening 30 intercommunication rubber dam, second opening 29 intercommunication external water source, the one end of first person in charge 18 is worn out from first opening 28, and the other end is worn out from second opening 29, the one end of second person in charge 19 is sealed, and the other end is worn out from third opening 30.
The pump station is equipped with operating system, fills and arranges the dam and all can realize remote control, and this system adopts German Siemens PLC able to programme to have easy operation, a tractor serves compatibly, intelligent height, independent soft start, the performance is more stable. One industrial desktop computer is selected for ground control, the working states of the water pump and the valve can be transmitted in real time, the functions of the water pump and the valve are consistent with those of a power distribution system in a pump room, the performance is stable and reliable, the operation is simple, and the failure rate is low. When the water pump needs to be manually operated to fill a dam, the sixth control valve 6, the seventh control valve 7, the ninth control valve 9, the twelfth control valve 12, the thirteenth control valve 13, the fourteenth control valve 14, the fifteenth control valve 15 and the sixteenth control valve 16 are opened in a manual mode, other valves are closed, and after the valves are completely opened, the two vacuum pumps 26 are started to observe vacuum pressure. When the vacuum pressure is 0.04MPa, one centrifugal pump 27 is started, the vacuum pump 26 is closed, the sixteenth control valve 16 is closed, the other two centrifugal pumps 27 are started, the first control valve 1 is slowly started after the operation is stable, the second control valve 2 is slowly started after the water outlet flow is observed to be stable, the third control valve 3 is slowly started after the flow is stable, and the water pump is stopped or the power supply is cut off when the pressure of the water outlet flow dam is observed to be abnormal. When the dam belt reaches the designated height, the first control valve, the second control valve and the third control valve 3 are closed, then the three centrifugal water pumps are closed one by one, and finally all valves are checked to be closed, and the manual water filling work is finished. When the evacuation dam needs to be manually opened, the fifth control valve 5, the seventh control valve 7, the eighth control valve 8, the twelfth control valve 12, the thirteenth control valve 13, the fourteenth control valve 14, the fifteenth control valve 15 and the sixteenth control valve 16 are opened in a manual mode, other valves are closed, when the valves are completely opened, one vacuum pump 26 is started, the vacuum pressure is observed, when the pressure is 0.04MPa, one centrifugal pump 27 is started, the vacuum pump 26 is simultaneously closed, the sixteenth control valve 16 is closed, the other three centrifugal pumps 27 are started, after the operation is stable, the first control valve 1, the second control valve 2, the third control valve 3 and the fourth control valve 4 are slowly and one by one, and the water outlet flow, the dam pressure and the liquid level height are observed. If an abnormality is found, the power supply is turned off or the water pump is stopped. When the dam belt reaches the designated height, the four centrifugal pumps 27 are closed one by one, all valves are checked and closed, and the manual dam discharging work is finished.
When the dam is filled in the automatic mode, a dam belt water filling key is pressed in the automatic mode, the sixth control valve 6, the seventh control valve 7, the ninth control valve 9, the twelfth control valve 12, the thirteenth control valve 13, the fourteenth control valve 14, the fifteenth control valve 15 and the sixteenth control valve 16 are automatically opened, the vacuum pump 26 is automatically started, and the vacuum pump 26 is automatically stopped after water is successfully introduced. While a centrifugal pump 27 opens its corresponding control valve slowly. After the operation is stable, the other two centrifugal pumps 27 and the control valve are opened one by one. And automatically stopping and closing all the valves after the set liquid level height reaches, or pressing an emergency stop key to close all the valves and the water pump after the liquid level reaches. Attention is paid to observing the flow, the liquid level of the dam belt and the pressure of the dam belt, and the power supply is cut off or a 'scram' key is pressed down in case of emergency. When the dam is discharged in the automatic mode, a dam belt drainage key is pressed in the automatic mode, the fifth control valve 5, the seventh control valve 7, the eighth control valve 8, the twelfth control valve 12, the thirteenth control valve 13, the fourteenth control valve 14, the fifteenth control valve 15 and the sixteenth control valve 16 are automatically opened, and the vacuum pump 26 is automatically started. After successful water diversion, the vacuum pump 26 is automatically stopped, and simultaneously, a centrifugal pump 27 opens a corresponding control valve and slowly opens. After the operation is stable, the other three centrifugal pumps 27 and the corresponding control valves of the control centrifugal pump 27 are opened one by one. The emptying time is set to automatically stop or the dam is pressed down to stop suddenly or the power supply is cut off after the water level of the dam is observed. Attention is paid to observing the flow, the liquid level of the dam belt and the pressure of the dam belt, and the power supply is cut off or the emergency stop is pressed down in case of emergency.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a retaining formula rubber dam pump station which characterized in that: the motor comprises a housin, be equipped with the pump package in the casing, be equipped with the opening with the pump package intercommunication on the casing, the pump package includes a plurality of vacuum pumps and a plurality of centrifugal pumps, the opening is equipped with threely, is first opening, second opening and third opening respectively, be connected through first being responsible for between first opening and the second opening, the third opening is connected with the second and is responsible for, vacuum pump and centrifugal pump setting are responsible for between first being responsible for and the second.
2. A storage rubber dam pump station according to claim 1, characterized in that: the centrifugal pump is equipped with four, four the centrifugal pump is connected through first branch pipe with first person in charge, four be equipped with first control valve, second control valve, third control valve and fourth control valve on the first branch pipe respectively.
3. A storage rubber dam pump station according to claim 2, characterized in that: the four vacuum pumps are connected with the second main pipe through second branch pipes, and a twelfth control valve, a thirteenth control valve, a fourteenth control valve and a fifteenth control valve are arranged on the four second branch pipes respectively.
4. A storage rubber dam pump station according to claim 3, characterized in that: and a third branch pipe is arranged between the first main pipe and the second main pipe, and an eighth control valve is arranged on the third branch pipe.
5. A impoundment type rubber dam pump station according to claim 4, characterized in that: the both ends of third branch pipe are located respectively and are close to second opening and third opening department, the part that first person in charge is close to first opening is equipped with the fifth control valve, the part that first branch pipe is close to the second opening is equipped with sixth control valve and seventh control valve, sixth control valve and seventh control valve set up respectively in the third branch pipe and the first both sides of being responsible for the tie point.
6. A impoundment type rubber dam pump station according to claim 5, characterized in that: and a ninth control valve is arranged at the position, close to the third port, of the second main pipe.
7. A impoundment type rubber dam pump station according to claim 6, characterized in that: the casing is internally provided with water tanks, one centrifugal pump corresponds to one vacuum pump one by one, and each group is arranged in one water tank.
8. A impoundment type rubber dam pump station according to claim 7, characterized in that: still be equipped with the vacuum pump in the casing, the vacuum pump passes through fourth branch pipe and four water tank intercommunications, be equipped with the sixteenth control valve on the fourth branch pipe.
9. A impoundment rubber dam pump station according to any of claims 1 to 8 wherein: first opening and third opening intercommunication rubber dam, the external water source of second opening intercommunication, the one end of first being responsible for is worn out from first opening, and the other end is worn out from the second opening, the one end that the second was responsible for is sealed, and the other end is worn out from the third opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911370176.5A CN110905828A (en) | 2019-12-26 | 2019-12-26 | Water storage rubber dam pump station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911370176.5A CN110905828A (en) | 2019-12-26 | 2019-12-26 | Water storage rubber dam pump station |
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| Publication Number | Publication Date |
|---|---|
| CN110905828A true CN110905828A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911370176.5A Pending CN110905828A (en) | 2019-12-26 | 2019-12-26 | Water storage rubber dam pump station |
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| CN (1) | CN110905828A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112813929A (en) * | 2020-12-31 | 2021-05-18 | 王兴超 | System for pumping and discharging gas accumulation and tail water of rubber dam |
| CN114076102A (en) * | 2020-08-17 | 2022-02-22 | 赫尔产品公司 | Dual start system for a pump |
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|---|---|---|---|---|
| US1837937A (en) * | 1930-03-14 | 1931-12-22 | Drysdale & Co Ltd | Combined water and air pump unit |
| CN2432361Y (en) * | 2000-07-08 | 2001-05-30 | 史守明 | Combined water pump |
| CN201857601U (en) * | 2010-11-08 | 2011-06-08 | 广州市水务规划勘测设计研究院 | Water filling and draining system for rubber dam |
| KR200469241Y1 (en) * | 2012-02-16 | 2013-10-01 | 한국수력원자력 주식회사 | Emergency drainage pump system of pumping-up electric power station |
| CN203583434U (en) * | 2013-08-16 | 2014-05-07 | 泰安市水建工程承包有限责任公司 | Dam filling device used for pillow type rubber dam |
| CN104265644A (en) * | 2014-09-22 | 2015-01-07 | 刘希元 | Centralized exhaust system for large-sized pump station |
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2019
- 2019-12-26 CN CN201911370176.5A patent/CN110905828A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1837937A (en) * | 1930-03-14 | 1931-12-22 | Drysdale & Co Ltd | Combined water and air pump unit |
| CN2432361Y (en) * | 2000-07-08 | 2001-05-30 | 史守明 | Combined water pump |
| CN201857601U (en) * | 2010-11-08 | 2011-06-08 | 广州市水务规划勘测设计研究院 | Water filling and draining system for rubber dam |
| KR200469241Y1 (en) * | 2012-02-16 | 2013-10-01 | 한국수력원자력 주식회사 | Emergency drainage pump system of pumping-up electric power station |
| CN203583434U (en) * | 2013-08-16 | 2014-05-07 | 泰安市水建工程承包有限责任公司 | Dam filling device used for pillow type rubber dam |
| CN104265644A (en) * | 2014-09-22 | 2015-01-07 | 刘希元 | Centralized exhaust system for large-sized pump station |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076102A (en) * | 2020-08-17 | 2022-02-22 | 赫尔产品公司 | Dual start system for a pump |
| CN114076102B (en) * | 2020-08-17 | 2024-01-05 | 赫尔产品公司 | Dual start system for pump |
| CN112813929A (en) * | 2020-12-31 | 2021-05-18 | 王兴超 | System for pumping and discharging gas accumulation and tail water of rubber dam |
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Application publication date: 20200324 |