Sound level meter is the most basic instrument in noise measurement. The sound level meter is generally composed of a condenser microphone, a preamplifier, an attenuator, an amplifier, a frequency weighting network, and an RMS indicator. The working principle of the sound level meter is: the microphone converts the sound into an electrical signal, and then the preamplifier transforms the impedance to match the microphone and the attenuator. The amplifier adds the output signal to the weighting network, performs frequency weighting on the signal (or external filter), and then amplifies the signal to a certain amplitude through the attenuator and amplifier, and sends it to the rms detector (or external power supply). flat recorder), the value of the noise sound level is given on the indicator head.
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Water is one of the important environmental factors and an important component of the human body. The body water content of man accounts for about 65% of body weight, and the daily physiological water requirement of each person is about 2 to 3 liters. All physiological activities of the human body, such as thermoregulation, nutrient delivery, waste excretion, etc., require water to complete. Therefore, it is essential to measure water quality.
The diaphragm coupling consists of at least one diaphragm and two shaft sleeves. The difference between the single-diaphragm coupling and the double-diaphragm coupling is the ability to handle various deviations, which requires the diaphragm to bend, so the single-diaphragm coupling is not suitable for eccentricity. The double-diaphragm coupling can be bent in different directions at the same time to compensate for eccentricity.
An air motor is a device that converts the pressure energy of compressed air into rotational mechanical energy. Typically used as a source of rotational power for more complex devices or machines. Air motors are classified by structure into: vane air motors, piston air motors, compact vane air motors, and compact piston air motors. The air motor is a relatively precise power machine. It is strictly forbidden to knock or disassemble it during installation. It does not bear axial force, please install and use the air motor under the correct requirements.
Static electricity is an electric charge at rest. In the dry and windy days, people often come across this phenomenon in their daily life. Static eliminator plays a very important role in this situation. In the following, we will introduce the differences between active static eliminator and passive static eliminator.
The diaphragm coupling is suitable for working in high temperature (-80+300) and harsh environments, and can operate under shock and vibration conditions. The diaphragm coupling can compensate for the axial, radial and angular offsets between the main motor and the driven motor due to manufacturing errors, installation errors, load-bearing deformation and the influence of temperature rise changes. Diaphragm coupling is a flexible coupling of metal elastic element. It relies on metal coupling diaphragm to connect the main and slave motors to transmit torque. It has the advantages of elastic vibration reduction, no noise and no lubrication. Ideal for gear couplings and general couplings. The diaphragm coupling has obvious shock absorption, no noise and no wear.
The shunt capacitor is mainly used to compensate the reactive power of the inductive load of the power system to improve the power factor, improve the voltage quality and reduce the line loss. Today, in addition to a brief introduction to the main function of shunt capacitors, we mainly introduce the fault judgment and troubleshooting of shunt capacitors.
KWe often hear shunt capacitors and series capacitors in circuit devices. So what is the difference between them? Today, we will introduce the differences between series capacitors and shunt capacitors.
A series capacitor is a reactive power compensation device. Usually series capacitors are used in EHV lines of 330kV and above. Its main function is to improve the system voltage from the perspective of compensating reactance, so as to reduce the power loss and improve the stability of the system. Capacitors must be able to withstand external forces due to short circuits, wind, snow and earthquakes. These mechanical forces are calculated through precise component analysis.
Static eliminator is composed of high voltage power generator and discharge electrode (generally made of ion needle), through the tip of high voltage corona discharge ionization of air into a large number of positive and negative ions, and then the wind blows a large number of positive and negative ions to the surface of the object to neutralize static electricity, or directly put the static eliminator near the surface of the object to neutralize static electricity.
BLDC motor (also known as brushless direct current motor) is a kind of permanent magnet synchronous motor. BLDC motor replaces the mechanical commutator on the brushed DC motor with an electric commutator, and is powered by a DC power supply through an integrated inverter or switching power supply to generate an AC signal to drive motor. It has the advantages of simple structure, no sparks during commutation, high operational reliability and low maintenance cost, so it has great advantages over traditional brushed DC motors in performance. BLDC motors have high efficiency and good operability, so they are widely used in various transmission industries.
As the key elastic element of the diaphragm coupling, the diaphragm bears the main load during operation. When the diaphragm shaft coupling rotates, its angular offset will generate alternating stress, which alternates once per rotation. The dynamic stress of the diaphragm will lead to the fatigue damage of the diaphragm and the bolt, so the accurate calculation of the dynamic and static composite stress is the key to predict the life of the diaphragm shaft coupling and the operation of the diaphragm shaft coupling.
Static eliminators are products that protect susceptible items from the effects of static discharge. There are rules that must be followed in static elimination. A thorough understanding of these principles is necessary to obtain the best performing equipment. The following will clarify some issues to consider when choosing static elimination.
The gearbox needs to withstand the force from the wind wheel and the reaction force generated by the gear transmission, which requires that the gearbox must have sufficient rigidity to withstand the force and torque, prevent deformation, and ensure the transmission quality.
The gearbox system includes gears, driveshafts, bearings and box structures. Among them, the box structure plays a supporting and sealing role in the whole system, and the probability of failure is very low. Therefore, in the gearbox, the failure mainly occurs in the gear, transmission shaft and bearing. According to statistics, gear, shaft and rolling bearing failures account for more than 90% of gearbox failures.
A diesel generator is a small power generation equipment, which refers to a powerful machine that uses diesel as fuel and uses a diesel engine as a prime mover to drive the generator to generate electricity. The whole set is generally composed of a diesel engine, generator, control box, fuel tank, storage battery for starting and control, protection device, emergency cabinet and other components. Silent diesel generators with 3 kW~10 kW can be used for daily power generation and emergency power generation in various homes, offices, and large, medium and small enterprises. A generator is a mechanical device that converts other forms of energy into electrical energy.
Compared with piston motors of similar power, vane air motors are smaller, lighter and less expensive. Simple design and construction allow them to operate at any installation angle in most cases. The vane motor has a wider range of speed, torque and power and is the most commonly used form of air motor.
Hydraulic motors are mechanical actuators that convert hydraulic pressure and flow into torque and angular displacement (rotation). Hydraulic motors are the rotary counterparts of hydraulic cylinders as linear actuators. ATO has high torque, high speed, high efficiency hydraulic radial piston motor, hydraulic pump motor, hydraulic orbital motor, optional working power 8-50 horsepower (6kW-38kW), rated pressure 2300~3600 psi, speed range 15-1500 rpm , ATO hydraulic motors have competitive prices and a wide range of applications.
Static eliminators are products that protect susceptible items from the effects of static discharge. These static shields are also known as antistatic (anti-static) devices, anti-static electricity devices, or static charge eliminators. Static eliminators work by dampening, reducing, or otherwise inhibiting its buildup or discharge.
Shaft couplings are mechanical parts used to connect two shafts (driving shaft and driven shaft) in different mechanisms to rotate together to transmit torque. In high-speed and heavy-duty power transmission, some couplings also have the functions of buffering, damping and improving the dynamic performance of the shafting. The coupling consists of two halves, which are respectively connected with the driving shaft and the driven shaft. Most of the general power machines are connected with the working machine by means of couplings.
The vane air motor is a device that can convert the pressure of compressed air into rotational mechanical energy. The most widely used in pneumatic transmission are vane and piston types. It is mainly composed of motor housing, connecting rod, crankshaft, piston, cylinder, valve and so on. The compressed air enters the valve core to make it rotate, and at the same time, the compressed air is fed into the surrounding cylinders in turn by the rotation of the valve core. Due to the expansion of the compressed air in the cylinder, the piston rod and the crankshaft are pushed to rotate. When pushed to the "bottom dead center", the valve spool also moves to the first exhaust position.
