KQF IV Full Automatic Dual Mode Water Supply Equipment
The KQF IV product is an organic combination of traditional transit boosting and emerging direct boosting (overlapping) water supply technologies, so it is called dual-mode water supply equipment. Since the two modes complement each other’s advantages, it can completely solve the problem of over-suction and is suitable for various occasions. widely. Similar products on the market have names such as “box-type lamination equipment” and “box-type non-negative pressure equipment”.
The technical composite of dual-mode KQFIV products is not a simple superposition, but an organic combination and integration based on system considerations. It uses the latest PLC technology for intelligent control and dispatch, centralizing and unifying the system’s water source management and water supply management, bringing a series of innovations And beneficial effects. The dual-mode water supply method can completely dispel doubts, and the laminated energy-saving water supply method can be used with confidence to ensure the continued safety of water supply and the municipal pipe network will not be affected.
Kaiquan has used many years of mature technology and rich experience in non-negative pressure water supply to research and develop KQFIV, a new generation of high-end dual-mode water supply equipment, which has performance advantages in water supply safety, reliable operation, water saving and sanitation, high efficiency and energy saving, and intelligent monitoring. More excellence.
KQF IV Full Automatic Dual Mode Water Supply Equipment
1. High reliability design features
2. Standardized and universal design
3. High performance design features
4. Energy-saving design features
5. Manufacturing process characteristics
- Water supply operating principle
- Device functions
- Equipment component diagram
- Model description
- Structure diagram
Four operating stages:
- Superimposed pressure operation: When the municipal pressure is normal, superimposed pressure operation is generally used. On the basis of the municipal pressure, it is boosted twice, and the difference is compensated for the difference, so as to more effectively exert the variable frequency energy-saving operation.
- Compensation operation: water supply during peak periods, when municipal pressure is low (or clock control), the compensation booster pump is automatically put in to provide a certain compensation flow. At this time, the water supply flow of the equipment (user flow) = suction flow + compensation flow. During the compensation operation, the electric valve is automatically closed to cut off the water supply pipeline of the water tank.
- Forced cycle operation: In order to prevent the water tank from storing water for too long, the equipment will force cycle update operation regularly.
- Transfer mode operation: During municipal maintenance (without pressure), the equipment automatically enters the transfer boosting mode with the water tank as the water source.
Main and backup redundant dual PLC control system
It uses industrial-grade, high-performance programmable controller PLC as the control core, adopts dual pressure check, and realizes speed control and intelligent dispatching of non-negative pressure water supply equipment according to user water conditions and municipal pipe network water supply conditions.
The KQF IV control cabinet adopts a main and backup redundant dual PLC control system. Even if the main control PLC fails due to lightning, surge and other unexpected events, it can still meet the user’s automatic constant pressure water supply by manually (or automatically) switching to the backup control system. , the control system is more safe and reliable.
High performance digital PID
It uses a high-performance, digital, self-tuning PID module specially developed for pressurized water supply systems to achieve constant pressure closed-loop speed regulation, strong anti-interference ability, and sensitive and rapid dynamic adjustment. Constant voltage accuracy ≤0.01Mpa, stabilization time ≤5s. High-performance digital PID ensures the comfort of equipment water supply.
Remote intelligent monitoring
Kaiquan Monitoring monitors the operating status of water pumps, inlet pressure, outlet pressure, operating frequency, current and voltage, etc., 24 hours a day, 24 hours a day, and provides equipment status early warning, alarm, and expert-level diagnosis; fault alarm text messages notify pump station maintainers.
Main control functions
| The main function | Content |
| Dual PLC control | Main and backup redundant dual PLC control systems prevent water outages caused by lightning, surges and other unexpected events. |
| High performance digital PID | Constant pressure accuracy ≤0.01Mpa, stabilization time ≤5s, equipment water supply comfort is good |
| Terminal constant voltage | It adopts variable voltage control method, which is more energy-saving and comfortable than ordinary frequency conversion water supply equipment; |
| Manual constant pressure | Even if both PLCs fail, manual start can still achieve constant pressure water supply; |
| Digital network | Digital bus collection of pressure, frequency, power and other data, the data is stable and reliable |
| Remote monitoring | Wireless network monitoring, fault warning, expert diagnosis, SMS notification |
| Color Chinese human-computer interface | 7″ color touch screen, clear process control process, friendly human-machine interface, easy to operate |
| Temperature and humidity control | Temperature and humidity detection, automatic control of heating, ventilation and dehumidification; |
| Power and signal isolation | Suppress transient overvoltage and overcurrent, and effectively suppress the interference of high-order harmonics to smart terminals; |
| Electrical protection | With overvoltage, undervoltage, overcurrent, overload, phase loss, short circuit, overheating and other fault alarms and automatic protection |
| Automatic fault reset | Automatically reset recoverable fault alarms such as frequency converters to ensure continuous and stable operation of equipment; |
| Automatic shielding of faulty pumps | If the running pump fails, the backup pump will automatically be put into operation; the scheduled operation will automatically skip the faulty pump. |
| Inlet pressure low pressure protection | It will automatically stop when there is water shortage to prevent excessive suction and prevent the water pump from running dry; it will automatically start when the water source is restored. |
| Outlet pressure ultra-high pressure protection | If the pressure transmitter fails and the pipe network pressure is extremely high, the system can still automatically shut down and issue an overpressure alarm. |
| Outlet pressure ultra-low pressure protection | When the equipment is running at full load and the operating pressure is still lower than the lower limit of the set pressure, the system automatically shuts down and gives a low-pressure alarm. |
| Controllable compensation | During peak water usage, the best time to control the compensation device is to compensate the stored water source to the user. |
| Automatic water change | Ensure that the stored water source is fresh and hygienic, start the compensation device regularly, and update the stored water source; |
| Automatic pump change | After a single pump runs for a set time, it automatically switches to another one to balance the running time of the water pump; |
| Shut down and maintain pressure | At low flow rate at night, the equipment automatically sleeps and relies on the air pressure tank to shut down and maintain pressure. |
| Number | Name | QTY | Number | Name | QTY |
| 1 | Municipal check valve | 1 | 9 | Water supply pressure tank | 1 |
| 2 | Pump set rubber joint | 2~4 | 10 | Boost check valve | 1 |
| 3 | Water inlet meters and sensors | 1 | 11 | Booster pump | 1 |
| 4 | Pump set inspection valve | 4~8 | 12 | Service valve | 1 |
| 5 | Water inlet steady flow tank | 1 | 13 | Water supply meters and sensors | 1 |
| 6 | Water inlet pressure tank | 1 | 14 | Water supply check valve | 2~4 |
| 7 | Vertical multistage centrifugal pump | 2~4 | 15 | Public chassis | 1 |
| 8 | Water main | 1 | 16 | Water leakage detection | 1 |
After 20 years of development, Kaiquan secondary supply equipment has developed in the fields of system integration, technical solutions, intelligent control, high reliability, high performance, generalization, high energy-saving design and manufacturing technology of products, forming numerous technical designs. features (including more than 40 patents), and transformed into a series of outstanding advantages of the product:
1. High reliability design features
(1) In order to ensure continuous operation, in addition to the mutual backup of multiple pumps, the issue of separate water tanks and mutual backup is also considered, so that the water does not need to be stopped during inspection and maintenance.
(2) The technical measures to prevent overflow and flooding are relatively complete and have a flood warning function to prevent the accident from expanding.
(3) When selecting test pipelines, on-site testing and debugging of optimal operating parameters, equipment operation comparison tests, etc. can be achieved;
(4) Fully variable frequency drive is used to ensure safe operation and avoid problems such as overload and pump oscillation caused by large-scale variable working conditions.
(5) It has an independent manual operation function and can be used as an emergency backup operation method when the automatic system fails;
(6) From sensors, controllers, to low-voltage electrical appliances, frequency converters, and major electrical appliances, high-reliability international famous brands are used
(7) Adopt high-reliability power supply design (60% of equipment failures are caused by electronic control or related, and 50% of electronic control failures are related to power supply),
(8) All PCB circuit boards adopt three prevention measures (waterproof, moisture-proof, and dust-proof, humid environment is one of the main reasons for failure).
(9) Specially adopts the main and backup redundant dual PLC control system, which is not afraid of unexpected failures, power surges and induced lightning strikes.
(10) The redundancy scope includes dual sensor configuration, dual fault detection, reliable early warning, alarm measures, and no false alarm shutdown.
2. Standardized and universal design
(1) Supporting standardization: adopt standard signal 4-20mA two-wire sensor; standard controller (PLC), speed regulator (PID) human-machine interface (HMI) standard interface and installation method to ensure universality, continuity and interchangeability .
(2) Programming visualization: Regardless of PLC, PID, HMI and various modules and instruments, all use visual ladder diagram programming. The software foundation is flawless. The programming tools are simple and easy to obtain, easy to upload and download, and the visualization is easy to learn and understand. It does not rely on coding experts. .
(3) Universal solution: The technical solution is universal and does not rely on special, specially-made, black box components or special usage. For example, a complex-designed inverter adopts the simplest application solution and can be interchanged with any brand at home and abroad at any time, and will not be unable to be replaced due to product upgrades.
3. High performance design features
(1) Using high-performance regulator (PID) + full variable frequency drag, the stabilization time can be less than 5 seconds and the impact amplitude is less than 10%
(2) It adopts analog terminal constant pressure control + full frequency conversion drag, which is more energy-saving and provides better water supply comfort.
(3) Intelligent control is adopted to adaptively operate under changing working conditions and parameters, and there will be no problem of pump oscillation due to critical flow rate.
4. Energy-saving design features
(1) The pump has passed the energy-saving certification and complies with the energy-saving evaluation value stipulated in GB19762-2007 “Energy Efficiency Limit Values of Clean Water Centrifugal Pumps”, and the supporting motor complies with the new national standard GB18613-2012 “Energy Efficiency Limit Values and Energy Efficiency Levels of Small and Medium-sized Asynchronous Three-Phase Motors” Level 2 energy efficient motor.
(2) Use variable constant pressure control to achieve energy-saving operation in small and medium flow sections, reducing the average energy consumption of the entire machine by 3-5%
(3) Adopt full variable frequency driving: achieve energy-saving operation in specific flow segments, reducing the average energy consumption of the entire machine by 3-5%
(4) Expansion of the inlet and outlet of the water pump: achieve energy-saving operation in large and medium flow sections, reducing the average energy consumption of the entire machine by 3-5%
(5) Standard air pressure tank volume: realizes energy saving when shutting down in small flow sections, reducing the average energy consumption of the whole machine by 3-5%
(6) Cross-region traffic complementary scheme (patented), saving 10-20% energy than conventional equipment
(7) Simulated water tower energy saving (patented), 10-20% energy saving than conventional equipment
5. Manufacturing process characteristics
(1) The cabinet adopts a three-in-one surface treatment process (nano ceramic coating + electrophoretic coating + powder coating), which abandons the traditional single powder coating surface treatment process and greatly improves the cabinet’s corrosion resistance, acid and alkali resistance ability.
(2) Process quality: Adopt the process requirements and quality control of the elevator and robot industries to ensure the safety and reliability of the equipment control system and improve the first pass rate of product debugging and operation.
(3) Welding process: Adopt the welding process of the nuclear power industry and pass the welding process qualification test.
(4) Electrolytic polishing: The internal and external colors are consistent, the polished surface is smooth, the luster is long-lasting, and there are no dead corners. It eliminates the problems of recesses and pipe inner walls that cannot be removed by mechanical polishing, increases the corrosion resistance of the internal and external surfaces of pipeline equipment, and can be applied to all stainless steel materials.
Standard configuration and options of equipment
KQFIV standard products specifically refer to the limited series of specifications in the sample, also called standard products.
| KQF IV product basic technical specifications table | ||
| Model specifications | KQF IV full series | |
| Structure size | See Table 3~4 | |
| Equipment pump configuration | Standard Grundfos CR series ram pump, flow rate and head are selected according to water supply design. | |
| Water supply flow | 8-180m3/h, determined by equipment model | |
| water supply pressure | 30-160mH20, determined by equipment model | |
| Pump actual pressure range | 40%-100% pump lift (full frequency control); 75%-100% pump lift (single frequency conversion control) Note: Some variable frequency controls are not suitable for large-scale variable operating conditions of water pumps. |
|
| Constant voltage accuracy | ≤1mH20 | |
| Stable schedule | ≤5s (full frequency control); ≤7S (single frequency control) | |
| Buffer facility | The equipment comes standard with WFF400 stainless steel steady flow buffer tank | |
| Compensation facilities | The water tank volume is determined by the design and is reflected in the equipment model, for example: Compensation water tank: considered based on 20% design flow x 60 minutes Backup water tank: considered based on 150% design flow x 60 minutes. |
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| Stable pressure tank | Equipment with water supply pressure below 80mH2O comes standard with G450X830-1.0 (80L) Zilmate diaphragm tank; Equipment with water supply pressure of 80~130mH2O comes standard with G450X910-1.6 (100L) Zilmate diaphragm tank; Equipment with a water supply pressure of 130mH2O or above does not include a pressure tank as standard; |
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| Water inlet and outlet pipes | For DN65~DN200, see KQF equipment series installation dimension tables 3~4 | |
| Frequency conversion control solution | Adopt full frequency conversion speed regulation (each pump is equipped with one frequency converter) | |
| Operation method | Manual operation, automatic operation | |
| Starting method | Variable frequency pump soft start; | |
| Control method | Equipment outlet constant pressure control or automatic pressure variable control (simulated terminal constant pressure control), can be set | |
| Operation mode | According to the water source conditions, pipe network boosting main mode, water tank compensation auxiliary mode, dual-mode parallel operation, organic compounding, automatic control. The operation mode of multi-pump dispatching is determined by the supporting control cabinet model and adopts BX or QB operation mode. | |
| HMI | Digital instrument, 7” true color touch screen | |
| Protection/Alarm | Short circuit, overload, phase loss protection, indicator light alarm. The frequency converter has more complete self-protection | |
| Troubleshooting | Each other’s backup pump; automatically degraded operation; | |
| Equipment material | The flow-passing parts (pumps, valves, tanks, pipelines) are made of food-grade 304 stainless steel, copper and rubber diaphragm materials. | |
| Protection level | Motor IP54, control cabinet IP54 | |
| Working conditions | Installation conditions | Concrete machine base with sufficient load-bearing capacity |
| Power supply | 380V (+10%, -15%), 50HZ, should have a good ground wire, and the ground resistance should be less than 4 ohms | |
| Environment | No freezing at 0-40℃, no condensation below 90%RH, no corrosive, flammable or explosive gases. Below 1000m altitude | |
| Altitude, vibration | Altitude below 1000m, below 5.9m/s (0.6g) | |
Attention: From different perspectives and due to technical or non-technical reasons, there are many changes in the selection combination of equipment. The selection principle is: the most suitable is the best.Our company provides free technical consulting services and detailed and complete analysis reports on optional solutions.
| Table 2-2 Scope of supply of KQF standard equipment (refer to the general assembly drawing) | ||
| Scope of Supply | QTY | Delivery instructions |
| 1. Stainless steel water tank and water tank accessories | 1 | The water tank is manufactured according to the contract specifications. The water tank accessories include: Y-type filter, electric valve, remote control |
| Float valve, liquid level transmitter, escalator, manhole, sewage valve, overflow port, inlet and outlet pipes | ||
| Interfaces, valves, etc. | ||
| 2. Stainless steel water pump unit | 1 | The water pump unit is packed in a separate wooden box and shipped from the factory. The inlet and outlet pipes and valves are fully equipped and flange-connected to the water tank on site. |
| 3. Buffer facilities | 1 | The equipment comes standard with a 400-caliber buffer tank and ancillary facilities. |
| 4. Control instruments | 2 | Includes: 2 on-site display pressure gauges and 2 pressure sensors. Supplied as an accessory and needs to be installed on site. |
| 5. Control cabinet | 1 | The control cabinet is packaged separately from the factory and all electrical wiring is not included in the scope of supply. |
| 6. Random files | 1 | Including instruction manual, electrical schematic diagram, certificate, etc. |
| Note: The main valve of the municipal water inlet pipeline, the main valve of the user water supply pipeline, the backflow preventer, filter, maintenance valve, etc. required for the secondary boosting system are not included in the supply scope of the equipment. The municipal direct water supply bypass pipeline is not included in the supply. within the scope of the goods. | ||
- Pipeline safety issues
When considering pipeline safety, special attention should be paid to the maximum pressure that may occur in the outlet pipeline of the water supply equipment, which is equal to 1.4 times the rated head of the water pump plus 0.4Mpa (inlet pressure). When the pump head is high, in order to prevent overpressure If a pipe bursts, a safety valve or automatic pressure relief valve should be installed in the pump room and a pressure relief water diversion pipe should be installed to the water collection well.
- Sample discrepancy problem
The product is constantly being improved, and some details of the equipment provided in the sample may differ from the actual product. It is difficult to notify changes in time. Please understand that the final order requirements are subject to the contract. If you need to accurately check the installation dimensions or require special customization and other information, please contact technical support personnel.