Heavy machinery parts HS code verification

List of contents of this article:

• 1,Heavy machinery parts HS code verification Why should the apron oil supply pipe network set up a constant voltage system
• 2
  、The constant pressure water supply system in the community always has water pump stuffiness

Why should the apron oil supply pipe network set up a constant pressure system

1. Briefly describe the function of the turbine EH oil system: provide power oil to the turbine main valve and speed-adjustable valve, so that it can move quickly, reliably and sensitively, Protect the safety of the steam turbine.

2. In the control system of some automatic transmissions, it is often in front of some key and precise control valves, such as the participation of bilateral throttlingIn the oil line in front of the digital pressure regulating valve, a special pre-valve filter is set up in series to prevent impurities from entering the throttle pores, causing the pressure regulating valve to fail and affecting the work of the entire control system.

3. If there is no one-way valve, after the OPC overspeed protection action, the OPC solenoid valve is electrically turned on to drain the oil pressure of the OPC master pipe, and the OPC mother pipe is connected to the AST mother pipe, and the oil pressure of the AST master pipe will also drop, causing the main valve to close the unit to trip.

4. V: Line loss compensation. The line loss compensation function is difficult for conventional controllers to achieve at present, because it requires software settings to automatically compensate according to different wire diameters and line lengths.

5. As for other student unions, class committees, dating, part-time jobs, etc., according to personal needs. ( Students who have the ambition to take the examination to select transfer students, student union orThe class committee still has to fight for it, because this is a threshold) If you want to join the university of the Party, you can fight for it. The way to fight is to study well and be some class cadres.

6. Accumulator is an energy saving device in a hydraulic and pneumatic system. It converts the energy in the system into compressed energy or potential energy at the right time and stores it. When the system needs it, it converts the compressed energy or potential energy into hydraulic or pneumatic energy and releases it to replenish the system.



What's the matter with variable frequency constant pressure water supply?

1. Ordinary mode, that is, the mode of constant pressure water supply. The speed of the water pump, that is, the outlet pressure, changes. In this mode, you only need to adjust the output frequency of the frequency converter through the up and down buttons. PID mode, that is, closed-loop control mode.

2. Variable frequency constant pressure water supply equipment is a new type of energy-saving water supply equipment. Variable frequency constant pressure water supply equipment is a mechatronic integrated high-tech energy-saving water supply device that uses today's most advanced microcomputer control technology to combine variable frequency speed controller and motor water pump.

3. When the municipal management network suppliesWhen the water pressure is lower than the set pressure, the equipment automatically enters the relay boosting working state. The unit forms a closed-loop control system through the pressure sensor, the water pump and the constant pressure frequency conversion control cabinet. With the change of water consumption, the speed of the pump and the number of pumps put into operation are constantly adjusted to keep the water supply pressure constant.

4. This is a set of constant pressure water supply system, which can stably supply water to various areas, and there will be no phenomenon of water suddenly large and small.

5. When the water source is cut off during constant pressure water supply, the water supply can continue for a period of time. The source of water supply is a reservoir or a water tank. The water supply system is an indispensable part of national production and life.

6. All kinds of constant pressure oil supply, constant pressure gas supply, constant pressure air supply and other constant pressure flow control systems. Currently used in the marketMost of them are variable frequency constant pressure water supply designed by Xingli Water Supply, because the performance is relatively stable and the quality is not bad. All these relevant water supply knowledge will be trained to users.

Why can constant pressure water supply save energy

is to replace the valve with motor frequency conversion. The energy loss of closing the valve is large. Frequency conversion directly reduces the power of the motor. So save energy.

First, it can reduce the wear of the water pump unit and extend the service life; second, it can save electricity; third, it can reduce the impact on the pipe network and promote water circulation and reduce the precipitation of impurities.

High efficiency and energy saving. Compared with the traditional water supply method, variable frequency constant pressure water supply can save 30%-60% energy. ( 2) Small area, low investment and high efficiency.(3) Flexible configuration, high degree of automation, complete functions, flexible and reliable.

Compared with the traditional water supply method, variable frequency constant pressure water supply can save 30%-60% energy. ( 2) Small area, low investment and high efficiency. ( 3) Flexible configuration, high degree of automation, complete functions, flexible and reliable.

Constant pressure water supply can keep the water supply pressure constant, which can maintain a balance between water supply and water use, that is, when more water is used, more water is used, and less water is used, so as to improve the quality of water supply.

Can variable frequency constant pressure water supply be used for drip irrigation pumps?

Constant pressure water supply in the drip irrigation and breeding industry can be realized by using the Aosheng frequency converter control cabinet.

Method 1: Installing a frequency converter cabinet can solve this problem. The frequency converter cabinet can provide constant pressure water supply.Method 2: Installing a pressure regulating valve can also play a constant pressure role.

Control drip irrigation area 76hm frequency conversion constant pressure automatic control device can not only be widely used in the water supply system of high-rise buildings and tap water plants, but also in agricultural pumping and irrigation systems, and has just begun to be applied in agricultural pumping and irrigation systems. Its water-saving and energy-saving technology has strong vitality and Broad application prospects.

The constant pressure water supply frequency converter can be changed to control the oil pump to achieve constant pressure oil supply. Because both frequency converters belong to the control processes of constant voltage, constant current, constant speed, constant temperature, etc., both keep the controlled physical quantity constant.

The inverter pump not only saves energy, but also saves electricity and water resources.

The water surface falls, and vice versa, the water surface rises, that is, the so-called water level stops changing between the static water level and the dynamic water level).Therefore, it will cause the residual pressure of the power frequency pump to change. Based on the same reasons as above: even if the water supply flow does not change, variable frequency constant pressure water supply can still be used.

The constant pressure water supply system in the community always has a water pump stuffled

1. The constant pressure of the pressure water supply is unstable, which is generally caused by two reasons. One is that the parameter setting of the frequency converter is inappropriate, especially the pid parameter Inappropriate settings will lead to this situation; another situation is that the frequency converter interferes with remote pressure gauges or pressure sensors and other devices, resulting in their inability to work properly.

2. There is air in the pump. Open the exhaust valve and start the pump after emptying. Check whether the inlet and outlet valves are open. The water level of the pool.

3. Generally speaking, in this case, it is a problem with the controller. The control of constant pressure water supply system has different methods of water level control and pressure control. The water level control failed, such as the floating ball switch is stuck. Or the pressure switch fails, etc.

4. Whether it is really turning, that is, to judge whether the exposed shaft of the pump body is turning when switching the frequency conversion or power frequency, this may be seen, such as rotation, the next step. 2. Whether the pump blade is turning, that is, the place where the water comes out of the front end, touch it with your hand to see if it vibrates. If so, the next step.

5. A pressure regulating valve can be added at the water outlet. Lower the speed of the driving force. In water plants or water supply stations, the outlet pressure is determined by the pump outlet pressure gauge or the pressure gauge on the outlet jellyfish pipe.

What's the matter with variable frequency constant pressure water supply?
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