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Shanghai Kaiquan Pump Manufacturing Co., Ltd
KQGW Non Negative Pressure Water Supply Equipment (Box Type)
NegotiableUpdate on 05/16
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Overview
KQGW Non Negative Pressure Water Supply Equipment (Box Type)
Product Details
KQGW Non Negative Pressure Water Supply Equipment (Box Type)
Product Introduction:
Product Name: KQGW Variable Frequency Speed Control Non Negative Pressure Water Supply Equipment
Model: GTGW80/40-2C
Product Category: Series Water Supply Equipment → KQGW Variable Frequency Speed Control Non Negative Pressure Water Supply Equipment
Caliber range: DN40-150
Flow range: 0.4-180m3/h
Head range: 9-305m
Our advantages: In stock, special materials can be customized, stable product performance, and a service life of over 5 years
Selection quotation: You only need to provide the number of households in the community and the number of floors, and we can provide you with a selection quotation
1. Scope of application: Suitable for pressurized water supply in areas with sufficient pressure in urban pipeline networks;
2. Applicable engineering types: production and domestic water for industrial and mining enterprises, large intermediate booster pump stations for water supply in water plants;
3. Applicable engineering location: secondary pressurization system for water supply;
4. Other applicable scope: Domestic water supply for newly built, renovated, expanded residential buildings, office buildings, hotels, restaurants and other public buildings;
5. Types of using units: design unit, construction unit, supervision unit.
2、 Product Overview:
The traditional water supply method cannot do without reservoirs, and the water in reservoirs is usually supplied by the tap water network. In this way, pressurized water enters the reservoir and becomes zero, resulting in a large amount of energy waste. KQGW variable frequency speed regulation non negative pressure water supply equipment is a complete set of water supply equipment developed by our professional technical personnel based on pneumatic water supply equipment, which can be directly connected to the tap water pipeline network without any negative effect on the tap water pipeline network. It can replace reservoirs and fully utilize the pressure of the tap water network to directly or indirectly supply water, avoiding secondary energy waste and pollution, significantly saving infrastructure investment and shortening construction period. The KQGW variable frequency speed regulation non negative pressure water supply equipment consists of an intelligent variable frequency control cabinet, a steady flow tank, a water pump unit, a table, valves and pipelines, a base, etc. It is suitable for all water supply systems that require increased water pressure and constant flow.
3、 Product Usage:
The KQGW series variable frequency speed regulation non negative pressure water supply equipment can be used for domestic water supply and also for fire water supply. It can be equipped with any type of water pump. When the equipment is used for fire protection, it is recommended to equip it with a fire specific water pump.
4、 Product advantages:
1. Energy saving (more energy-efficient)
No environmental pollution, more energy-efficient, saving over 30% more energy than typical water supply equipment.
2. Stable and reliable
Danish Grundfos or Southern Water Pump is used, and Schneider Electric is used for low-voltage electrical appliances. Multiple water pumps are used for operation, and the failure of a single pump does not affect normal water supply.
3. Intelligent control
Fully automatic intelligent operation, no need for personnel management, cost saving, worry free and labor-saving. The control core adopts ABB frequency converter and PLC control.
4. Flexible and convenient
The device is compact, easy to install, and easy to maintain.
5. Environmental Protection
Adopting austenitic stainless steel SUS304 food grade material, there is no secondary pollution, no need for cleaning, and meets the hygiene requirements for direct drinking.
5、 Equipment Introduction
1. It is to integrate the water tank and water pump used in the water supply system of the tap water pipeline, so that the water pump, control cabinet, non negative pressure device and other equipment are placed in the water tank, and the equipment is isolated from the water in the water tank through the water tank partition. The placement of the water pump inside the water tank greatly reduces the noise of the equipment.
2. The inlet of the variable frequency pump is connected to the non negative pressure device and the non negative pressure water device. When the pressure is sufficient, the non negative pressure device automatically opens, and the water is directly supplied by the municipal pipeline network, which is then pressurized by a booster pump to supply water to the user. When the non negative city device detects a decrease in pressure in the municipal pipeline network, the non negative pressure inlet device immediately starts and the non negative pressure device closes. At this time, the user pipeline is directly pressurized by pumping water from the water tank through the booster pump to ensure sufficient pressure in the user pipeline.
3. The inlet of the water tank of the non negative pressure variable frequency water supply equipment adopts an intelligent solenoid valve to control the inlet pressure and water level. When the pressure in the pipeline decreases and the booster pump draws water from the water tank, intelligent control can be used. When the water level in the tank is below a certain level, the solenoid valve can be opened to release water from the pipeline, ensuring a certain pressure at the water intake. This measure can avoid peak water consumption and play a peak shaving role. It also avoids zero pressure discharge from ordinary water tanks, which is a good protection for pipeline pressure.
4. The water tank, water pump, pipelines, valves and other water related materials in this complete set of equipment are all made of food grade stainless steel materials, which will not cause secondary pollution to tap water. At the same time, the equipment is equipped with an intelligent circulation system, which automatically draws water from the water tank every 6 hours to ensure fresh water quality, hygiene and environmental protection.
6、 Equipment installation requirements:
1. Tighten the anchor bolts to prevent vibration during start-up from affecting the performance of the pump.
2. Install regulating valves on the inlet and outlet pipelines of the pump, and install pressure gauges near the pump outlet to control the pump's operation within rated conditions and ensure its normal use.
3. If a check valve is installed in the discharge pipeline, it should be installed outside the gate valve.
4. The installation methods of non negative pressure water supply equipment pumps are divided into rigid connection installation and flexible connection installation.
5. Before installing the non negative pressure water supply equipment, carefully check whether there are any hard objects inside the pump body to avoid damaging the impeller and pump body during operation
6. When installing non negative pressure water supply equipment, it is not allowed to add pipeline capacity to the pump to avoid deformation and affecting normal operation.
7、 Installation and Debugging
1. The basic dimensions on site should be constructed according to the foundation drawing provided by our company, and its position and elevation should comply with the engineering design and water conservancy requirements; When pouring cement slurry for the second time, it should meet the horizontal requirements, and its longitudinal and transverse levelness should not exceed 0.1%
2. After the equipment is installed in place, all fasteners should be tightened, and the equipment should be carefully checked for any running or dripping water to avoid water leakage caused by transportation vibration.
3. The power supply incoming line requires a three-phase five wire system, with a voltage requirement of AC380, ± 10%. If there is a leakage protection switch at the power supply incoming line end, the leakage current must be greater than 500MA. Otherwise, during frequency conversion operation, the user will trip in the air (because the frequency converter is a power element composed of multiple components).
4. After the equipment is powered on, manually set the machine and adjust the forward and reverse rotation of each pump; If it is reversed, the corresponding input two-phase power supply can be switched. If it is reversed during frequency conversion, change the frequency converter parameter 1003 to 1 or 2 for switching (ABB frequency conversion).
5. When adjusting the automatic mode, attention should be paid to the wiring of the corresponding numbers of the three protectors. The leakage protection switch at the bottom of the tank is normally in the open state with water and closed state without water. Before wiring, use a multimeter to check.
6. The equipment parameters are fully digitized in Chinese. When setting values, attention should be paid to the protection value for low tap water inlet and the acceleration time of the frequency converter, sleep time, timed pump cut-off time, and positive and negative pump cut-off differences. They are all set at the factory. If there are special requirements on site, please consult our technical department.
8、 Fault causes and troubleshooting methods
Solution to the cause of the malfunction
1、 Fault: Excessive starting load
Reason: The outlet valve was not closed during startup
Solution: Close the valve and restart it
2、 Excessive current during operation
1. The clearance between the pump impeller and the pump casing is too small, resulting in friction
2. Inhalation of debris inside the pump
3. Bearing wear
4. Excessive flow and low head
5. Pump shaft bending
6. The clearance between the couplings is too small
7. Voltage too low
1. Check the clearance between the impeller and repair it
2. Disassemble and remove debris
3. Replace damaged bearings
4. Close the outlet valve appropriately
5. Remove the shaft for straightening
6. Adjust the gap again
7. Poor contact of contactor contacts
3、 Equipment vibration
1. Loose bolts
2. Bearing wear or damage
3. The coupling is not concentric
4. Unbalanced pump shaft or motor shaft
1. Tighten bolts
2. Replace bearings
3. Align the coupling
4. Rectify or replace the pump shaft or motor shaft
4、 Bearing overheating
1. Bearing damage or looseness
2. Incorrect installation of bearings
3. Poor lubrication of bearings or inconsistent oil quality
4. Shaft bending or coupling misalignment
5. The impeller loses balance
1. Replace or adjust bearings
2. Reinstall and adjust the gap
3. Clean the bearings and refill them with oil
4. Straighten the pump shaft or coupling and realign it
5. Clean the debris in the impeller balance hole
5、 The pressure gauge shows pressure, but there is no water at the outlet
1. The pipeline configuration is too small and the resistance is too high
2. Is the water pump reversing
3. Is the impeller inlet and flow channel blocked
1. Overhauled or modified the water outlet pipe
2. Pump motor phase line swapping
3. Remove debris from the pump
6、 Insufficient traffic
1. Wear of the mouth ring and excessive clearance with the impeller
2. The outlet valve is not fully opened or damaged
3. Pipeline leakage
1. Replace the mouth ring
2. Fully open the outlet valve or replace it
3. Repair or replace the water supply pipe
7、 The water pump cannot sleep
1. Pipeline leakage
2. The system pressure setting value is too high
3. Water pump running without water
4. The sleep limit is set too low
1. Check and eliminate leakage points
2. Adjust the set value again
3. Check the inlet of the water pump
4. Reset sleep limit
