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What are the filling methods for oil filling machines?
There are approximately the following filling methods commonly used in oil filling machines:
1. Rotary filling machine
2. Self flow filling machine
3. Piston filling machine
4. Weighing filling machine
5. Flow meter filling machine Rotary filling machine can also be called rotary filling machine, generally using continuous filling form, that is, the packaging container automatically completes the filling action during operation.
. The structure and principle of the self flowing filling machine are relatively simple, so the cost is relatively low and it is easy to maintain. However, the speed is slow, the accuracy is low, and it is seriously affected by the liquid level. Moreover, since the self flowing filling machine is only affected by gravity and atmospheric pressure to complete the filling operation, it may not be possible to achieve filling for liquids with high viscosity. In short, the plunger filling machine is based on the needle tube principle and uses a piston to achieve filling. Due to cost and consumable reasons, as well as the relatively small filling volume, it is more practical for small and medium doses and not suitable for large dose filling. The weighing filling machine uses the high measurement accuracy of electronic scales to connect the electronic weight signal sensor with the weighing control instrument through a data cable. During the measurement process, the pressure signal of the electronic scale is continuously transmitted to the control instrument. When the preset quantitative weight is reached, the control instrument controls the pump to stop and the pneumatic valve to close, which is more pract_600x400.jpg)
2. What is the formula for calculating the volumetric efficiency of a plunger pump?
The formula for calculating the volumetric efficiency (η v) of a plunger pump is: η v=(Qactual/Qtheoretical) × 100% Calculation formula analysis: η v: volumetric efficiency (expressed as a percentage) Q Actual: actual output flow rate of the pump (unit: L/min or m ³/s) Q Theoretical: theoretical flow rate of the pump (unit: L/min or m ³/s), calculation formula Q Theoretical hail bucket=n × V × 10 ⁻ ³ (n is the speed, unit: rpm); V is the displacement, in mL/r) 2. Key parameters indicate that the actual flow rate needs to be measured on-site through a flow meter; The theoretical flow rate is calculated based on the design displacement and operating speed of the pump. The loss of volumetric efficiency is mainly caused by internal leakage (such as clearance between plunger and cylinder body, wear of distribution plate), oil compressibility, and cavitation phenomenon. 3. Industry reference standards usually require a volumetric efficiency of ≥ 92% for new pumps (the common standard for high-pressure plunger pumps), and maintenance is required for old pumps when it is below 85%. According to GB/T 7936-2012 "Method for Measuring Idle Displacement of Hydraulic Pumps and Motors", the test should
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