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In chemical experiments, pressure-reducing devices are usually used, and the devices used to reduce pressure in the laboratory, there are usually water vacuum pumps and oil vacuum pumps.
The advantages of an oil Vacuum Pump are a large vacuum degree and a good pumping effect. The disadvantages are: high cost, easy to leak oil and gas, pollution of air; oil vacuum pump decompression machine mechanical structure is complex, strict working conditions, more pipeline interfaces, more auxiliary equipment (three dry cooling traps), the connection is difficult; if the experiment students do not operate according to the rules, low boiling point organic substances are easy to penetrate into the liquid, so that oil deterioration, not only
lower the vacuum, but also must often change the oil, resulting in waste, and increasing the workload of the experimenter.
And the advantages of a water vacuum pump are easy to use and clean, no air pollution, and environmental protection.
Water vacuum pump and oil vacuum pump have their own advantages and disadvantages in the process of use, LACHOI on the basis of their improvement, designed a kind of water pump and oil pump in one, to overcome their shortcomings of the decompression device - circulating water vacuum pump, the key to its technology is to design and install a clear water pump on the original use of glass decompression pump, the use of clear water pump pumping cycle to achieve the decompression purpose. In the process of experimental teaching and scientific research, the experimental effect is remarkable and has been well-received by teachers and students.
(1) Circulating Water Vacuum Pump Improvement In Working Principle
The circulating water vacuum pump pumps water in the fixed water reservoir through the glass decompression pump, which sucks in and compresses the gas and removes it, and empties the external safety bottle, thus increasing the decompression efficiency.
(2) Circulating Water Vacuum Pump Improvement In Configuration
Pumping: Pumping water in a fixed water reservoir through a glass depressurization pump and thus depressurization.
Safety bottle: prevent water from being sucked back into the working system, and also plays a role in relieving the internal and external pressure during operation; easy to observe when inadvertently sucked back, and easy to discharge the backed-up liquid.
Air pressure gauge: measure the degree of evacuation.
The circulating water vacuum pump improvement in configuration can be shown in the figure.
(1) The improved circulating water vacuum pump can overcome the disadvantages of oil pump decompression machines such as complicated mechanical structure, strict working conditions, easy oil leakage, and increased pipeline interface.
(2) The addition of a freshwater pump to the original glass decompression pump can overcome the vacuum of the pump small degree, and the shortcomings of the water pressure; so that the water pressure can be greatly increased and stable, so that the decompression efficiency is improved, the experimental results show that the water circulation vacuum pump The experimental results show that the evacuation effect of circulating water vacuum pump is three times of the effect of the water pump.
(3) The water in the sink can be recycled, which saves water, is easy to use, clean and inexpensive.
(4) The requirements of the working environment are not high, and it is not affected by acid, alkali, water vapor, and low boiling point organics.
(5) More economical than oil vacuum pumps, durable and easy to store and use.
(6) According to the principle of circulating water vacuum pump can be assembled into a platform type or walking type at will, which is very suitable for students' experimental use and meets the needs of teachers' scientific research.
(7) The circulating water vacuum pump has been successfully developed and shown through experiments that its maximum pressure can reach 0.02Mpa, and it has been used in many chemical experiments to achieve good results, and has been promoted in many schools in various laboratories, and has been well received by teachers and students.
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