CN115405512A - Multiple water hammer hazard protection device for high-lift water lifting equipment and control method - Google Patents
Multiple water hammer hazard protection device for high-lift water lifting equipment and control method Download PDFInfo
- Publication number
- CN115405512A CN115405512A CN202210982183.6A CN202210982183A CN115405512A CN 115405512 A CN115405512 A CN 115405512A CN 202210982183 A CN202210982183 A CN 202210982183A CN 115405512 A CN115405512 A CN 115405512A
- Authority
- CN
- China
- Prior art keywords
- valve
- protection
- automatic control
- control cabinet
- swing check
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- F04B53/10—Valves; Arrangement of valves
-
- 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
- F04B51/00—Testing machines, pumps, or pumping installations
-
- 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
-
- 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
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a multiple water hammer hazard protection device and a control method for high-lift water lifting equipment, which comprises starting protection, protection when a unit normally operates and stops, and equipment fault emergency stop protection; the start-up protection controls the sectional hydraulic working valve (10) through a pressure monitoring system to ensure that the pressure of an outlet pipeline slightly fluctuates; when the unit is normally operated and stopped, the protection carries out multiple interception by closing the sectional type hydraulic working valve (10) and the swing check valve (8) in sequence; the emergency shutdown protection of equipment failure is realized by carrying out switch control on a sectional type hydraulic working valve (10), a swing check valve (8) and an electric maintenance ball valve (13). According to the invention, multiple interception is realized by controlling the sectional hydraulic working valve, the swing check valve and the electric maintenance ball valve, double protection is realized under the normal condition of main equipment, and triple protection is realized according to different fault problems under the abnormal condition of the main equipment, so that the system can run more safely and stably.
Description
Technical Field
The invention relates to the technical field of pipeline water delivery and transfer, in particular to a multiple water hammer hazard protection device and a control method for high-lift water lifting equipment.
Background
In recent years, due to climate change, rainfall unbalance and uneven water resource distribution all over the country are caused, so that the water levels of reservoirs, dams and lakes are rapidly reduced or withered due to continuous drought in part of regions, the production and life of people are seriously influenced, and even the benign development of local economy and society is restricted. In order to effectively solve the problems of water resource allocation and reasonable utilization, various places actively adopt a water transportation and allocation mode to relieve the problems of production, life and ecological water utilization, and rivers, reservoir dams and pool water with rich water resources are pressurized and lifted to high points of a plot through long-distance and high-altitude pipelines and then are conveyed to various water-requiring points through regulation and distribution.
In order to ensure the water consumption of each water demand point, the safe and stable operation of the pressurized water lifting equipment must be ensured, two fatal hazards of water transfer equipment must be eliminated firstly to solve the problem, one is a water hammer phenomenon, and the other is the reverse hazard of a main motor caused by the backflow of water at a high-pressure end. What adopt on most water delivery transfer projects at present is that water hammer bleeder valve or buffer tank realize, can not carry out timely, effectual protection to main part equipment under the abnormal conditions, cause the damage of equipment, influence its life, invisibly increased the maintenance cost of examining of equipment.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the multiple water hammer hazard protection device and the control method for the high-lift water lifting equipment are provided, the fluid non-return device and the hydraulic control working valve are arranged between the outlet of the main pump and the maintenance valve, so that the main equipment of the water lifting system is protected multiple times, the equipment hazard under abnormal conditions is reduced, the service life of the equipment is prolonged, the stable operation of the system and the timely allocation of water resources are ensured, and meanwhile, unnecessary economic loss is avoided.
The technical scheme of the invention is as follows:
the invention discloses a control method for multiple water hammer hazard protection of high-lift water lifting equipment, which comprises starting up protection, protection when a unit normally operates and stops, and equipment fault emergency stop protection; the start-up protection controls the sectional hydraulic working valve through a pressure monitoring system to ensure that the pressure of an outlet pipeline slightly fluctuates; when the unit normally operates and stops, the protection carries out multiple interception by closing the sectional type hydraulic working valve and the swing check valve in sequence; the equipment failure emergency stop protection is realized by carrying out switch control on a sectional type hydraulic working valve, a swing check valve and an electric maintenance ball valve.
According to the method, multiple interception is realized by controlling the sectional hydraulic working valve, the swing check valve and the electric maintenance ball valve, double protection is realized under the normal condition of main equipment, and triple protection is realized according to different fault problems under the abnormal condition of the main equipment, so that the system can run more safely and stably.
Further, the boot protection includes the following steps: after the automatic control cabinet receives a starting command, firstly detecting and confirming that the electric valves at the inlet and the outlet of the unit are at the opening positions, then starting a main pump and a motor by an upper computer in the automatic control cabinet, and controlling a swing check valve to be opened; when the automatic control cabinet receives full rotation speed or the pressure value of the first pressure transmitter exceeds the pressure value of the second pressure transmitter by 0.05MPa, the automatic control cabinet controls to open the sectional type hydraulic working valve at constant speed, and the pressure of the outlet pipeline is ensured to fluctuate slightly.
Further, the protection when the unit normally operates and stops comprises the following specific steps: when the automatic control cabinet receives a shutdown command, the upper computer in the automatic control cabinet firstly closes the sectional hydraulic working valve, the automatic control cabinet stops the main pump and the motor after receiving the complete closing of the sectional hydraulic working valve, and simultaneously closes the swing check valve.
Further, the equipment failure emergency shutdown protection comprises the following specific steps: when the automatic control cabinet receives an equipment accident or fault signal, an upper computer in the automatic control cabinet starts an emergency shutdown process, the sectional hydraulic working valve and the electric maintenance ball valve are closed simultaneously, and after the automatic control cabinet receives a complete closing signal of the sectional hydraulic working valve, the main pump and the motor are automatically stopped, and the swing check valve is automatically closed simultaneously.
Further, during the equipment failure emergency shutdown protection, when the whole system is powered down and shut down, an upper computer in the automatic control cabinet starts an emergency shutdown process, stops the main motor and closes the swing check valve, the sectional type hydraulic working valve and the electric maintenance ball valve at the same time.
Further, when the equipment is subjected to fault emergency shutdown protection and the sectional type hydraulic working valve fails and can not normally work, the working personnel adopt local or remote emergency shutdown, and when the automatic control cabinet receives an emergency shutdown signal, an upper computer in the automatic control cabinet immediately stops a main motor to close the swing check valve and simultaneously automatically closes the electric maintenance ball valve.
The invention also discloses a multiple water hammer hazard protection device for the high-lift water lifting equipment, which comprises an inlet water tank, an outlet water tank, an automatic control cabinet, a swing check valve, a sectional type hydraulic control working valve and an electric maintenance ball valve; swing check valve, sectional type liquid accuse working valve and electronic maintenance ball valve are connected with the automatic control cabinet respectively, and swing check valve, sectional type liquid accuse working valve and electronic maintenance ball valve are installed on the pipeline of being connected between entry pond and export pond, electronic maintenance ball valve is close to the export pond, and sectional type liquid accuse working valve sets up at electronic maintenance ball valve front end, and swing check valve sets up at sectional type liquid accuse working valve front end.
Above structure, through set up electronic maintenance ball valve on the main pipeline of export, this valve is as the shutoff valve device under the normal condition, and the front end that electronic maintenance ball valve on the main pipeline of export sets up the working valve that surges, as the water hammer protector under the control and the normal condition when starting and stopping the pump, sets up the swing check valve at the front end that the working valve that surges, dams as the secondary and water hammer protector.
Furthermore, the device also comprises an inlet electric butterfly valve, an inlet expansion joint, a main pump, a motor and an outlet expansion joint; the inlet electric butterfly valve, the inlet telescopic joint, the main pump, the motor and the outlet telescopic joint are sequentially arranged on a pipeline connected between the inlet water tank and the outlet water tank.
Further, still including setting up the first outlet pressure table and the first outlet pressure transmitter between main pump and motor and swing check valve to and set up the second outlet pressure table and the second outlet pressure transmitter between sectional type liquid accuse working valve and electric overhaul ball valve.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the sectional type hydraulic working valve, the swing check valve and the electric maintenance ball valve are arranged on the main pipeline of the outlet of the pump unit to form a main series protection device for water hammer damage of main equipment of the pump unit, and the three valves are controlled to be opened and closed under different conditions, so that the damage of the water hammer to the main equipment is greatly reduced, and the service life of the equipment is prolonged.
2. The invention protects the startup and shutdown of the starting-up and shutdown of the engine under normal conditions, protects equipment accidents, system power failure shutdown and abnormal operation of the sectional type hydraulic working valve under abnormal conditions, has obvious multiple protection effects and ensures the safe and stable operation of the system.
3. The water hammer protection of the invention is mainly to carry out the cutoff protection by controlling the on-off of a plurality of valves, and the main equipment is safer after multiple cutoff, thus being more beneficial to the inspection and maintenance of front-end related equipment, reducing the consumption of spare parts and lowering the production and operation cost.
Drawings
FIG. 1 is a schematic diagram of the multiple protection technique of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Reference numerals: 1. an automatic control cabinet; 2. an inlet electric butterfly valve; 3. an inlet expansion joint; 4. an inlet pressure gauge; 5. a main pump and a motor; 6. a first outlet pressure gauge; 7. a first outlet pressure transmitter; 8. a swing check valve; 9. an outlet expansion joint; 10. a segmented hydraulic control working valve; 11. a second outlet pressure gauge; 12. a second outlet pressure transmitter; 13. electrically overhauling the ball valve; 14. an outlet water pool; 15. an inlet basin.
Detailed Description
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The technical solution of the present invention is further described in detail with reference to the following examples.
As shown in fig. 1, a control method for multiple water hammer hazard protection of high-lift water lifting equipment comprises starting up protection, protection during normal operation and shutdown of a unit and equipment fault emergency shutdown protection; the start-up protection controls the sectional hydraulic working valve 10 through a pressure monitoring system to ensure that the pressure of an outlet pipeline slightly fluctuates; when the unit is normally operated and stopped, the protection is carried out by closing the sectional type hydraulic working valve 10 and the swing check valve 8 in sequence to carry out multiple interception; the equipment failure emergency shutdown protection is controlled by switching on and off the sectional hydraulic working valve 10, the swing check valve 8 and the electric maintenance ball valve 13.
The boot protection comprises the following specific steps: after the automatic control cabinet 1 receives a starting command, an upper computer in the automatic control cabinet 1 firstly detects that the electric valves at the inlet and the outlet of the machine set are in an opening state, then a main pump and a motor 5 are started, and a swing check valve 8 is controlled to be opened; when the automatic control cabinet 1 receives that the motor is at full rotation speed or the pressure value of the first pressure transmitter 7 exceeds the pressure value of the second pressure transmitter 12 by 0.05MPa, the automatic control cabinet 1 controls to open the sectional type hydraulic working valve 10, so that slight fluctuation of the pressure of an outlet pipeline is ensured, and the damage protection of a main body device and a pipeline starting water hammer is realized. When the unit is normally operated and shut down, the protection method comprises the following specific steps: when the automatic control cabinet 1 receives a shutdown command, the upper computer in the automatic control cabinet 1 firstly closes the sectional hydraulic working valve 10, the automatic control cabinet 1 stops the main pump and the motor 5 after receiving the complete closing of the sectional hydraulic working valve 10, and simultaneously closes the swing check valve 8, so that the slight fluctuation of the pressure of the outlet pipeline is ensured, and the pump shutdown water hammer hazard protection of main equipment and pipelines is realized.
The emergency shutdown protection when the equipment fails comprises the following specific steps: when the automatic control cabinet 1 receives an equipment accident or fault signal, an upper computer in the automatic control cabinet 1 starts an emergency shutdown process, and simultaneously closes the sectional hydraulic working valve 10 and the electric maintenance ball valve 13, when the automatic control cabinet 1 receives a complete valve closing signal of the sectional hydraulic working valve 10, the main pump and the motor 5 are automatically stopped, and simultaneously, the swing check valve 8 is automatically closed, so that the slight fluctuation of the pressure of an outlet pipeline is ensured, and the emergency shutdown pump water hammer damage protection of main equipment and pipelines is realized; when the whole system is powered off and shut down, the automatic control cabinet 1 and each auxiliary device are switched to direct current power supply, the upper computer starts an emergency shutdown process, and the main motor is shut down while the swing check valve 8, the sectional hydraulic working valve 10 and the electric maintenance ball valve 13 are closed, so that the emergency pump shutdown water hammer damage protection on main body equipment and pipelines is realized; when the sectional hydraulic working valve 10 fails and cannot work normally, a worker takes an on-site or remote emergency stop, and when the automatic control cabinet 1 receives an emergency stop signal, the upper computer in the automatic control cabinet 1 immediately closes the electric maintenance ball valve 13 and simultaneously automatically closes the swing check valve 8, so that emergency pump-stopping water hammer damage protection on main equipment and pipelines is realized.
As shown in fig. 2, the invention discloses a multiple water hammer hazard protection device for high-lift water lifting equipment, which comprises an inlet water pool 15, an outlet water pool 14, an automatic control cabinet 1, a swing check valve 8, a sectional type hydraulic control working valve 10 and an electric maintenance ball valve 13; swing check valve 8, sectional type hydraulic control working valve 10 and electronic maintenance ball valve 13 are connected with automatic control cabinet 1 respectively, and swing check valve 8, sectional type hydraulic control working valve 10 and electronic maintenance ball valve 13 are installed on the pipeline of being connected between entry pond 15 and export pond 14, electronic maintenance ball valve 13 is close to export pond 14, and sectional type hydraulic control working valve 10 sets up at electronic maintenance ball valve 13 front end, and swing check valve 8 sets up at sectional type hydraulic control working valve 10 front end. An electric maintenance ball valve is arranged on the outlet main pipeline, and the valve is normally opened to serve as a shutoff valve device under normal conditions; a hydraulic working valve is arranged at the front end of the electric overhaul ball valve on the outlet main pipeline and is used as a water hammer protection device for control during starting and stopping of the pump and under normal conditions; the front end of the hydraulic working valve is provided with a swing check valve which is used as a secondary interception and water hammer protection device.
The device also comprises an inlet electric butterfly valve 2, an inlet expansion joint 3, a main pump and motor 5 and an outlet expansion joint 9; the inlet electric butterfly valve 2, the inlet telescopic joint 3, the main pump and motor 5 and the outlet telescopic joint 9 are sequentially arranged on a pipeline connected between an inlet water pool 15 and an outlet water pool 14; and a first outlet pressure gauge 6 and a first outlet pressure transmitter 7 which are arranged between the main pump and motor 5 and the swing check valve 8, and a second outlet pressure gauge 11 and a second outlet pressure transmitter 12 which are arranged between the sectional type hydraulic control working valve 10 and the electric service ball valve 13.
The present invention is described in more detail and with reference to specific embodiments thereof, which should not be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which all belong to the protection scope of the present application.
Claims (9)
1. A control method for multiple water hammer hazard protection of high-lift water lifting equipment is characterized by comprising starting up protection, protection when a unit normally operates and stops and equipment failure emergency stop protection; the start-up protection controls the sectional hydraulic working valve (10) through a pressure monitoring system to ensure that the pressure of an outlet pipeline slightly fluctuates; when the unit is normally operated and stopped, the protection carries out multiple interception by closing the sectional type hydraulic working valve (10) and the swing check valve (8) in sequence; the equipment failure emergency shutdown protection is realized by carrying out switch control on a sectional type hydraulic working valve (10), a swing check valve (8) and an electric maintenance ball valve (13).
2. The control method for multiple water hammer hazard protection of high-lift water lifting equipment according to claim 1, wherein the startup protection comprises the following specific steps: after confirming that the electric valves at the inlet and the outlet of the unit are in the normally open positions, after the automatic control cabinet (1) receives a starting command, an upper computer in the automatic control cabinet (1) firstly starts a main pump and a motor (5) and controls a swing check valve (8) to be opened; when the automatic control cabinet (1) receives full rotation speed or the pressure value of the first pressure transmitter (7) exceeds the pressure value of the second pressure transmitter (12), the automatic control cabinet (1) controls to open the sectional type hydraulic working valve (10) to ensure that the pressure of the outlet pipeline slightly fluctuates.
3. The control method for the multiple water hammer hazard protection of the high-lift water lifting equipment according to claim 1, wherein the protection when the unit is normally operated and shut down comprises the following specific steps: when the automatic control cabinet (1) receives a stop command, an upper computer in the automatic control cabinet (1) firstly closes the sectional hydraulic working valve (10), and after the automatic control cabinet (1) receives the complete closing of the sectional hydraulic working valve (10), the main pump and the motor (5) are stopped, and the swing check valve (8) is closed at the same time.
4. The control method for multiple water hammer hazard protection of high-lift water lifting equipment according to claim 1, wherein the equipment fault emergency shutdown protection comprises the following specific steps: when the automatic control cabinet (1) receives an equipment accident or fault signal, an upper computer in the automatic control cabinet (1) starts an emergency stop process, the sectional hydraulic working valve (10) and the electric maintenance ball valve (13) are closed at the same time, and when the automatic control cabinet (1) receives a complete valve closing signal of the sectional hydraulic working valve (10), the main pump and the motor (5) are automatically stopped, and the swing check valve (8) is automatically closed at the same time.
5. The control method for the multiple water hammer hazard protection of the high-lift water lifting equipment according to claim 4, characterized in that during the equipment failure emergency shutdown protection, when the whole system is powered down and shut down, an upper computer in an automatic control cabinet (1) starts an emergency shutdown process, and simultaneously closes a swing check valve (8), a sectional type hydraulic working valve (10) and an electric maintenance ball valve (13).
6. The control method for the multiple water hammer hazard protection of the high-lift water lifting equipment according to claim 4, characterized in that during the equipment failure emergency stop protection, under the condition that the sectional hydraulic working valve (10) fails and cannot work normally, a worker takes an on-site or remote emergency stop, and when the automatic control cabinet (1) receives an emergency stop signal, an upper computer in the automatic control cabinet (1) immediately stops a main pump and the motor (5) closes the electric maintenance ball valve (13) and simultaneously the swing check valve (8) automatically closes.
7. A multi-water-hammer hazard protection device for high-lift water lifting equipment is characterized by comprising an inlet water pool (15), an outlet water pool (14), an automatic control cabinet (1), a swing check valve (8), a sectional type hydraulic control working valve (10) and an electric maintenance ball valve (13); swing check valve (8), sectional type liquid accuse working valve (10) and electronic maintenance ball valve (13) are connected with automatic control cabinet (1) respectively, and swing check valve (8), sectional type liquid accuse working valve (10) and electronic maintenance ball valve (13) are installed on the pipeline of being connected between entry pond (15) and export pond (14), electronic maintenance ball valve (13) are close to export pond (14), and sectional type liquid accuse working valve (10) set up at electronic maintenance ball valve (13) front end, and swing check valve (8) set up at sectional type liquid accuse working valve (10) front end.
8. The multiple water hammer hazard protection device for the high-lift water lifting equipment according to claim 7, further comprising an inlet electric butterfly valve (2), an inlet expansion joint (3), a main pump and motor (5) and an outlet expansion joint (9); the inlet electric butterfly valve (2), the inlet telescopic joint (3), the main pump and motor (5) and the outlet telescopic joint (9) are sequentially arranged on a pipeline connected between the inlet water tank (15) and the outlet water tank (14).
9. The multiple water hammer hazard protection device for the high lift water lifting equipment according to claim 7, further comprising a first outlet pressure gauge (6) and a first outlet pressure transmitter (7) arranged between the main pump and motor (5) and the swing check valve (8), and a second outlet pressure gauge (11) and a second outlet pressure transmitter (12) arranged between the sectional type hydraulic control working valve (10) and the electric service ball valve (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982183.6A CN115405512A (en) | 2022-08-16 | 2022-08-16 | Multiple water hammer hazard protection device for high-lift water lifting equipment and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982183.6A CN115405512A (en) | 2022-08-16 | 2022-08-16 | Multiple water hammer hazard protection device for high-lift water lifting equipment and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115405512A true CN115405512A (en) | 2022-11-29 |
Family
ID=84159613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210982183.6A Pending CN115405512A (en) | 2022-08-16 | 2022-08-16 | Multiple water hammer hazard protection device for high-lift water lifting equipment and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115405512A (en) |
-
2022
- 2022-08-16 CN CN202210982183.6A patent/CN115405512A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101608613B (en) | Zero-disturbance switching method of pipeline transportation standby pump | |
| CN202860889U (en) | Automatic start-stop device for high pressure water cleaning device | |
| CN106400882A (en) | Water hammer protection device for long-distance pumping water supply system | |
| CN102410229A (en) | Movable pumping station | |
| CN205822349U (en) | A kind of water tower-constant voltage duplex water system | |
| CN115405512A (en) | Multiple water hammer hazard protection device for high-lift water lifting equipment and control method | |
| CN201788066U (en) | Full automatic pressure tester | |
| CN203756630U (en) | Novel sliding nozzle hydraulic control system | |
| CN112196783A (en) | Automatic control starting method for pump set of long-distance large-pipe-diameter water delivery and transfer pump station | |
| CN217781938U (en) | Emergency accident drainage system for leakage water collecting well of large hydropower station | |
| CN216382098U (en) | Furnace hydraulic system with standby function | |
| CN205638880U (en) | Closed level four connection in series -parallel pump station system | |
| CN102312467B (en) | Stable air-pressure fire water supply system | |
| CN215596407U (en) | Water turbine main shaft seal water supply and drainage system | |
| CN112096623B (en) | Automatic shutdown control method for pump set of long-distance large-pipe-diameter pipeline water delivery pump station | |
| CN213236984U (en) | Power source safety fast switching device of gas pipeline regulating valve | |
| CN205296301U (en) | No negative pressure water supply equipment of pressure -stabilizing box formula intelligence | |
| CN214297948U (en) | Lubrication system for hazardous waste conveying pipeline | |
| CN202099830U (en) | Automatic water supply system for construction water | |
| CN202250898U (en) | Movable pump station | |
| CN107780461A (en) | Super High is without negative pressure relay water supply equipment | |
| CN112524468A (en) | Controllable environment-friendly safety device for supplying lubricating oil in wire high-speed area | |
| CN201359133Y (en) | Device for preventing gas leakage of water-sealed valve of gas-conduit | |
| CN202730151U (en) | Blast furnace circulating water protective device | |
| CN113738715B (en) | Lifting hydraulic device for LF furnace electrode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |