Although chemical pump research and development work has been a hundred years of history, but for some special applications of chemical pumps also have special requirements. For example, users are often consulted about particularly viscous, or particularly lean, media issues regarding chemical pump output power and chemical pump drive components. This article will introduce readers to how two companies in northern Germany work together to address these issues raised by users.
Rotor pumps, chemical pumps that transport a wide range of media, should not only minimize wear but also require precision manufacturing. Its drive system should have the best dynamic performance: the motor speed should be constant rotation in a wide range of speed, accurate drive rotor pump work. To ensure that a variety of stable flow of media output. Especially in the output of high viscosity medium, the rotor pump drive system can output a strong driving torque at low speed. On the other hand, it also requires that the rotor pump should be capable of outputting a medium with a viscosity difference of 200 mPas when it outputs particularly thin media, especially when no thin media is required for pulse-free output. This rotor pump drive system is a very high demand: the rotor pump drive system should be in the media viscosity decreased, the amount of backflow increases, the higher speed operation, to ensure a constant output flow.
Rotor pump with vane rotor
Waukesha Cherry-Burrell has long been a technology leader in high-viscosity and low-viscosity media conveying technology. Its sister plant is Bran + Luebbe, a subsidiary of SPX Process Equipment Group. Waukesha company's products are mainly sold to medical and health products manufacturing enterprises. Such as food manufacturing, pharmaceutical manufacturing, health care products manufacturers, paint and paint manufacturers and chemical products manufacturing enterprises. In order to meet the media delivery requirements of these companies, Waukesha has developed a rotor pump with a curved vane rotor using Alloy 88, a patented, proprietary material. When the blade rotor with the traditional high-quality steel stator supporting the use, it does not produce adhesion, low noise.
This patented alloy allows the smallest possible clearance between the rotor and the stator, minimizes pump leakage during lean media transport from a rotor pump design point of view, and ensures pulsation-free flow of fluid. Large capacity of the pressure chamber and a lower rotor speed to ensure continuous, non-stagnant output of various media. The pump can deliver medium viscosities in the range of 1 to 1,000,000 mPas. Bran + Luebbe is responsible for sales and marketing of this pump in countries in the German-speaking world.
In general, there are pump drive system. Depending on the pump usage, speed and torque requirements, different drives for the rotor pump can be adapted. Various power systems - from simple, non-speed-adjusted, flow-free drive motors to complex, rotor-pump controls with digitally controlled adjustments, are complemented by Bran + Luebbe. Typical rotor pump drive power of 0.55 ~ 1.5kw motor, some special rotor pump drive power up to 45kw.
The choice of rotor pump drive system is influenced by the size of the installation space and the degree of safety protection required. Nord + + + IP 65 motors from Bran + Luebbe. And drive systems that meet Atex standards. Part of the rotor pump uses a simple spur gear motor, the motor is fixed with ground screws. Nord also offers a motor-transmission drive system, all of which are housed in a single housing with no connecting flanges, no torsional stress and lateral stresses, very smooth operation, minimal maintenance, and long service life long. Bran + Luebbe equips the rotor pump with a torque of 50 to 20000 Nm. For high-viscosity output media, the starting speed of the drive system can be 8 rev / min, the working speed of 600 rev / min.
When the rotor pump wide range of applications, can be equipped with a proportional regulator. This kind of rotor pump with proportional control has good working reliability, adaptability and comfort of use. For example, a fully integrated drive system, the Trio SK 300E is a complete drive system that combines a drive motor with a drive. It is not only suitable for distributed control drive applications, but also for manual speed adjustment applications. Located in the inverter above the end of the operating panel, greatly facilitate the user's operation. In many applications, this operator control panel makes it easy to adjust the steering and speed of the drive system to optimally match the function and flow of the rotor pump to the overall system's mechanical performance.
Electronic nameplate
The integrated structure of the Trio drive, the motor leads with EMI shielding, etc. make it meet the requirements of the EMV standard. The frequency converter has an operating temperature range of -10 ° C to + 50 ° C and a good motor overheating Protective function. Its basic configuration includes brake and mains filters, starting torque up to 400% of operating torque and up to 200% over short periods of time in five seconds, all of which make the drive a very solid drive system. In addition, it has low mechanical sensitivity and is insensitive to grid disturbances. For example, the voltage drop on the grid, the temperature changes are not sensitive. If the inverter system must be replaced, then the entire system drive parameters remain unchanged, as if the "electronic nameplate" to save these operating parameters to the same motor, people just connected to a new inverter, you can read directly Into the drive parameters, immediately put into work.
In the operation of converting operating parameters
If the Trios drive itself does not meet the user's specific performance requirements, the Nordac SK 700E's electronic regulator can be used for replenishment and performance improvements. It can save the working parameters of four sets of rotor pump parameters can be online conversion, regulation and selection. Equipment can be quickly realized in different media, different output and different production processes between the conversion requirements.
For special operating requirements of the rotor pump, such as pressure regulation, the SK 700E measurement and PID adjustment functions can be used. Data acquisition of pressure values ​​is carried out by the pressure regulator pressure sensor via the analogue signal input (0 to 10V, 0 / 4 ~ 20mA) directly. The PID regulator integrated in the inverter system will adjust the control loop according to the received data so that the working parameters of the rotor pump can be changed while the rotor pump is working. If you choose the code feedback technology and positioning control technology, you can use these new control technology to achieve high-quality quantitative delivery tasks. For example, the operating parameters of the rotor pump can be changed, the actual pressure values ​​can be matched, the adjusted input and output interfaces can be adjusted directly, and the working parameters can be optimized via the local bus. The use of local network bus system, can be achieved on a control system rotor pump control, parameter assignment, rotor pump status querying and troubleshooting and maintenance services.
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