Xi'an no negative pressure automatic water supply equipment program selection
1. The use of high-performance frequency converters, equipped with advanced digital microcomputer control technology, high degree of automation, can achieve constant pressure variables, more constant pressure variables, variable pressure variable control methods. The system runs smoothly, is safe and reliable, and has a low failure rate.
2. Microcomputer control multiple pumps, reliable realization of soft start, no impact current, small mechanical wear, can extend the service life of equipment.
3, according to changes in water consumption, can complete the cycle of the pump group frequency conversion, according to the principle of the first open and stop operation, balance the workload of the pumps to extend the life of the pump.
4, high equipment efficiency, energy saving effect is significant, the device can automatically detect, automatically adjust the user's pipe network water, water pressure, so that the pump is always running in the efficient area, saving 14.7% than the pressure tank water supply, water conservancy than the constant speed operation 58.2%.
5. When the differential control is realized, the multi-channel pump is soft-started and speed-regulated, and if necessary, it is switched to the power-frequency operation, and it has a manual operation function. When the inverter or the controller fails, the switch is switched to the “manual†position, and the manual The start and stop buttons of each pump on the operation panel enable continuous water supply.
6. Set the working water pressure by digital and display the actual working pressure with digital display so that the actual working pressure is consistent with the set pressure.
7. The alarm will stop when the water pressure is too low, the water pressure will automatically start up after the restoration, the pipe network high water pressure alarm, the LED frequency indication, the inverter abnormal indication, and the motor fault status indication.
8, protection functions: undervoltage protection, overload protection, lack of phase protection, stall protection, motor grounding protection.
9, according to the needs of users can be flexible to change the way of working: 1 a pump frequency conversion work, other pump frequency work; 2 nighttime small flow pump timing shutdown; more than 3 pumps cycle frequency conversion work.
Xi'an no negative pressure automatic water supply equipment of the composition and working principle of the device using computer-controlled variable frequency speed control to achieve constant pressure water supply, which negative pressure compensation system to overcome the adverse effects of the pipe network. The flow chart is as follows: The fully automatic non-negative pressure pipe network direct-connected water supply equipment system is shown in Figure 1. The system sets a certain pressure value. If the pressure in the municipal pipe network is higher than the set pressure value, the pressure transmitter sends the signal to the frequency conversion control cabinet so that the pump unit is in the dormant state. Tap water can be directly connected to the user's pipe network to provide water through the connecting pipe. When the pressure in the municipal pipe network decreases or the user pipe network water consumption increases, the pressure sensor feeds back the signal that the user pipe network pressure is lower than the set value to the PID controller in the inverter control cabinet, and starts the pump unit through it to adjust the inverter. The output frequency, adjust the pump speed to maintain constant pressure water supply; if a small number of pumps can not meet the requirements of the water supply, the inverter will control the frequency conversion of multiple pumps or power frequency operation to achieve the constant pressure variable water supply requirements when the pump unit water supply In balance with the water inlet of the water pipe network, the negative pressure canceller isolates the constant voltage compensator from the outside, and the pump unit can use tap water pressure to provide constant pressure water supply. Once the balance is destroyed, the negative pressure eliminator makes the constant voltage compensator communicate with the outside world, and through the detection device in the constant voltage compensator, the vacuum degree and the water level signal in the regulated voltage compensator are collected and fed back to the microcomputer through the microcomputer.
The operation of negative pressure eliminator is controlled to suppress the generation of negative pressure, so as to ensure that the equipment does not have any negative impact on the urban pipe network under the premise of maintaining normal water supply.
When the municipal pipe network stops watering, the pump unit can continue to work until the water level in the constant pressure compensator falls to the lower limit of the liquid level and is automatically shut down. After the water is turned on, it is automatically turned on again.
When the control system is out of power, the pump unit will stop working. The tap water can enter the user's pipe network through the communication pipe between the municipal pipe network and the user, to supply water to the low floor users.
Xi'an no negative pressure automatic water supply equipment technical parameters
1. Power supply: 3-phase five-wire system, 380V (±10%), 50HZ (±5%);
2, water supply range: 0 ~ 10000m3 / h;
3, pressure range: 0 ~ 2.5MPa;
4, pressure adjustment accuracy: ≤ 0.01MPa;
5, control power: ≤550KW;
6, steady flow compensation: 0.5m3 ~ 100m3;
Xi'an no negative pressure automatic water supply equipment environmental requirements
1, the ambient temperature: -1 °C ~ 50 °C, relative humidity ≤ 90%, anhydrous beads condensation;
2. Below 1000 meters above sea level, no flammable, corrosive gas, no oil mist, no charged dust;
3, no strong vibration source (maximum vibration speed ≤ 0.6G);
4. Drainage facilities are installed at the installation site, and there is no stagnant water on the ground;
5, control cabinet shell and grounding terminal is actually grounded, grounding resistance ≤ 4Ω
Xi'an no negative pressure automatic water supply equipment selection description:
DWZG fully automatic non-negative pressure pipe network direct connection type water supply equipment is determined according to the tap water inflow (depending on tap water pipe diameter, pressure and other conditions), customer actual water consumption peak height, building height and other data to determine, we provide The selection parameter table follows the following principles:
1, the flow in the table is designed according to m3/h, the design model is a common model, and can also be designed according to the customer's specific conditions;
2. The flow rate of the equipment does not include the standby pump flow. No standby pump is provided for the number of pumps in the table.
3. The specifications of the regulated voltage compensator recommended in the table are estimated based on general conditions. If the water intake cannot meet the requirements of the peak water usage, the volume of the regulated voltage compensation needs to be recalculated. The formula is as follows:
Xi'an no negative pressure automatic water supply equipment debugging notes:
1. Be sure to flush the piping before connecting the equipment. Before commissioning, be sure to provide enough water to check whether the liquid level meter is installed. The pump must not be commissioned without load, otherwise it will damage the components.
2. After the main switch in the electric control cabinet is closed and the single-pole switch of the control power supply is closed, manual and automatic operation of the equipment can be performed. The equipment is in a running state and it is forbidden to operate the "automatic/manual" switch.
3, the use of self-coupling step-down startup equipment, it is strictly prohibited to start, brake, or it may cause damage to the equipment. The inverter and control cabinet must be grounded reliably.
4. Do not electrify maintenance and maintenance of high-power inverters. After cutting off the power of the control cabinet, wait at least 5 minutes until the intermediate circuit capacitor is discharged. The operator must be a professional. Clean the dust in the control cabinet regularly to keep the control cabinet clean. Check the wiring screws in the electrical cabinet from time to time to ensure reliable wiring.
5, if the fault alarm can not be automatic, the emergency water can be used manually. During this period, the manufacturer was notified to send maintenance personnel to the site for processing. There was no professional training personnel to repair it on their own, otherwise serious consequences may occur.
1. The use of high-performance frequency converters, equipped with advanced digital microcomputer control technology, high degree of automation, can achieve constant pressure variables, more constant pressure variables, variable pressure variable control methods. The system runs smoothly, is safe and reliable, and has a low failure rate.
2. Microcomputer control multiple pumps, reliable realization of soft start, no impact current, small mechanical wear, can extend the service life of equipment.
3, according to changes in water consumption, can complete the cycle of the pump group frequency conversion, according to the principle of the first open and stop operation, balance the workload of the pumps to extend the life of the pump.
4, high equipment efficiency, energy saving effect is significant, the device can automatically detect, automatically adjust the user's pipe network water, water pressure, so that the pump is always running in the efficient area, saving 14.7% than the pressure tank water supply, water conservancy than the constant speed operation 58.2%.
5. When the differential control is realized, the multi-channel pump is soft-started and speed-regulated, and if necessary, it is switched to the power-frequency operation, and it has a manual operation function. When the inverter or the controller fails, the switch is switched to the “manual†position, and the manual The start and stop buttons of each pump on the operation panel enable continuous water supply.
6. Set the working water pressure by digital and display the actual working pressure with digital display so that the actual working pressure is consistent with the set pressure.
7. The alarm will stop when the water pressure is too low, the water pressure will automatically start up after the restoration, the pipe network high water pressure alarm, the LED frequency indication, the inverter abnormal indication, and the motor fault status indication.
8, protection functions: undervoltage protection, overload protection, lack of phase protection, stall protection, motor grounding protection.
9, according to the needs of users can be flexible to change the way of working: 1 a pump frequency conversion work, other pump frequency work; 2 nighttime small flow pump timing shutdown; more than 3 pumps cycle frequency conversion work.
Xi'an no negative pressure automatic water supply equipment of the composition and working principle of the device using computer-controlled variable frequency speed control to achieve constant pressure water supply, which negative pressure compensation system to overcome the adverse effects of the pipe network. The flow chart is as follows: The fully automatic non-negative pressure pipe network direct-connected water supply equipment system is shown in Figure 1. The system sets a certain pressure value. If the pressure in the municipal pipe network is higher than the set pressure value, the pressure transmitter sends the signal to the frequency conversion control cabinet so that the pump unit is in the dormant state. Tap water can be directly connected to the user's pipe network to provide water through the connecting pipe. When the pressure in the municipal pipe network decreases or the user pipe network water consumption increases, the pressure sensor feeds back the signal that the user pipe network pressure is lower than the set value to the PID controller in the inverter control cabinet, and starts the pump unit through it to adjust the inverter. The output frequency, adjust the pump speed to maintain constant pressure water supply; if a small number of pumps can not meet the requirements of the water supply, the inverter will control the frequency conversion of multiple pumps or power frequency operation to achieve the constant pressure variable water supply requirements when the pump unit water supply In balance with the water inlet of the water pipe network, the negative pressure canceller isolates the constant voltage compensator from the outside, and the pump unit can use tap water pressure to provide constant pressure water supply. Once the balance is destroyed, the negative pressure eliminator makes the constant voltage compensator communicate with the outside world, and through the detection device in the constant voltage compensator, the vacuum degree and the water level signal in the regulated voltage compensator are collected and fed back to the microcomputer through the microcomputer.
The operation of negative pressure eliminator is controlled to suppress the generation of negative pressure, so as to ensure that the equipment does not have any negative impact on the urban pipe network under the premise of maintaining normal water supply.
When the municipal pipe network stops watering, the pump unit can continue to work until the water level in the constant pressure compensator falls to the lower limit of the liquid level and is automatically shut down. After the water is turned on, it is automatically turned on again.
When the control system is out of power, the pump unit will stop working. The tap water can enter the user's pipe network through the communication pipe between the municipal pipe network and the user, to supply water to the low floor users.
Xi'an no negative pressure automatic water supply equipment technical parameters
1. Power supply: 3-phase five-wire system, 380V (±10%), 50HZ (±5%);
2, water supply range: 0 ~ 10000m3 / h;
3, pressure range: 0 ~ 2.5MPa;
4, pressure adjustment accuracy: ≤ 0.01MPa;
5, control power: ≤550KW;
6, steady flow compensation: 0.5m3 ~ 100m3;
Xi'an no negative pressure automatic water supply equipment environmental requirements
1, the ambient temperature: -1 °C ~ 50 °C, relative humidity ≤ 90%, anhydrous beads condensation;
2. Below 1000 meters above sea level, no flammable, corrosive gas, no oil mist, no charged dust;
3, no strong vibration source (maximum vibration speed ≤ 0.6G);
4. Drainage facilities are installed at the installation site, and there is no stagnant water on the ground;
5, control cabinet shell and grounding terminal is actually grounded, grounding resistance ≤ 4Ω
Xi'an no negative pressure automatic water supply equipment selection description:
DWZG fully automatic non-negative pressure pipe network direct connection type water supply equipment is determined according to the tap water inflow (depending on tap water pipe diameter, pressure and other conditions), customer actual water consumption peak height, building height and other data to determine, we provide The selection parameter table follows the following principles:
1, the flow in the table is designed according to m3/h, the design model is a common model, and can also be designed according to the customer's specific conditions;
2. The flow rate of the equipment does not include the standby pump flow. No standby pump is provided for the number of pumps in the table.
3. The specifications of the regulated voltage compensator recommended in the table are estimated based on general conditions. If the water intake cannot meet the requirements of the peak water usage, the volume of the regulated voltage compensation needs to be recalculated. The formula is as follows:
Xi'an no negative pressure automatic water supply equipment debugging notes:
1. Be sure to flush the piping before connecting the equipment. Before commissioning, be sure to provide enough water to check whether the liquid level meter is installed. The pump must not be commissioned without load, otherwise it will damage the components.
2. After the main switch in the electric control cabinet is closed and the single-pole switch of the control power supply is closed, manual and automatic operation of the equipment can be performed. The equipment is in a running state and it is forbidden to operate the "automatic/manual" switch.
3, the use of self-coupling step-down startup equipment, it is strictly prohibited to start, brake, or it may cause damage to the equipment. The inverter and control cabinet must be grounded reliably.
4. Do not electrify maintenance and maintenance of high-power inverters. After cutting off the power of the control cabinet, wait at least 5 minutes until the intermediate circuit capacitor is discharged. The operator must be a professional. Clean the dust in the control cabinet regularly to keep the control cabinet clean. Check the wiring screws in the electrical cabinet from time to time to ensure reliable wiring.
5, if the fault alarm can not be automatic, the emergency water can be used manually. During this period, the manufacturer was notified to send maintenance personnel to the site for processing. There was no professional training personnel to repair it on their own, otherwise serious consequences may occur.
The diameter of the DO-41 diode body is in the range of 2.0mm~2.7mm, the length of the diode body is between 4~5.2mm, the diameter of the pins at both ends is between 0.71mm~0.86mm, and the overall length is 25.4mm.
This DO-41 plastic package is available in a through-hole version. This axial lead device is ideal for customer premises equipment (CPE), such as telephones, answering machines, modems, and fax interfaces. When appropriate over-current protection is included, the DO-41 package series can also be used for over-voltage protection in applications such as T1/E1/J1 relay cards.
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Changzhou Changyuan Electronic Co., Ltd. , https://www.changyuanelectronic.com