How to Maintain Liquid Ring Vacuum Pump

The liquid-ring vacuum pump is a kind of coarse vacuum pump. The limit vacuum it can obtain is 2000-4000Pa. The series air ejector can reach 270-670Pa. The liquid-ring vacuum pump can also be used as a compressor, which is called water-ring compressor. It belongs to the low-pressure compressor. Its pressure scale is 1-2*105Pa gauge pressure.

The liquid ring vacuum pump began to be used as a self-suction pump, and then gradually used in many industrial sectors such as petroleum, chemical industry, machinery, mining, light industry, medicine and food. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, liquid ring vacuum pumps are widely used.

Because of the rapid development of vacuum technology, liquid ring vacuum pump has always been paid attention to in rough vacuum acquisition. Because the gas in the liquid ring vacuum pump is isothermal, it can extract flammable and explosive gases. In addition, it can also extract dust and water containing gases. Therefore, the use of liquid ring vacuum pump is increasing.

Compared with other types of mechanical vacuum pumps, liquid ring vacuum pumps have the following advantages: simple structure, low manufacturing accuracy and simple processing. Compact structure, high pump speed, generally can be directly connected with the motor, without the need for deceleration equipment. Therefore, with a small structural scale, large exhaust volume can be obtained and the area occupied is small.
Liquid Ring Vacuum Pump

Liquid Ring Vacuum compressor

Main parameters of vacuum pump

The main parameters of vacuum pump are as follows:

(1) Pumping rate. When a pump is equipped with a standard experimental cover and operates under specified conditions, the ratio of the flow rate of gas flowing through the experimental cover to the equilibrium pressure at the specified position on the experimental cover is referred to a s pumping speed in m3/a or L/s.

(2) Pumping capacity. Gas flow through the inlet of the pump in units of Pa.m3/s or Pa.L/s.

(3) Limit pressure. When the pump is equipped with a standard test cover and operates under specified conditions, the minimum pressure tends to be stable without introducing gas into normal operation, in unit of Pa.

(4) Start-up pressure. The pressure when the pump starts without damage and has the function of pumping, Pa.

(5) Front pressure. The exhaust pressure is lower than the outlet pressure of a vacuum pump at atmospheric pressure. The unit is Pa.

(6) Maximum front-stage pressure. If the pump exceeds this value, it will be called maximum front-stage pressure in units of Pa.

(7) Maximum working pressure. It corresponds to the maximum suction and inlet pressure. Under this pressure, the pump can work continuously without deterioration or damage.

(8) Compression ratio. The ratio of the outlet pressure of a pump to the inlet pressure of a given gas.

Dry Type Vacuum Pump
dry screw vacuum pump

Liquid Ring Vacuum Pump

Vacuum Pump Use and Nursing

1) Vacuum pumps are used in the laboratory for general pumping and air supply.

2) In order to prevent corrosive gases, humid air, and solid substances from entering the pump and destroying the pump body, a series of protection devices must be placed in front of the inlet. Depending on the application and the object, these protection devices may include: corrosive gases. Absorber, dryer, buffer bottle to prevent liquid from directly entering the pump.

3) When using, it must be idling for 2~3 minutes before working. The pump should keep enough oil (No. 3 spindle oil), not lower or higher than the oil mark horizontal line.

4) Always keep the machine clean to prevent dust or other solid materials from falling into the pump through the inlet and outlet, so as not to cause machine wear and reduce vacuum.

5) Before starting to use in winter, the oil temperature should be increased to about 10 °C before use. When the oil quality in the fuel tank is not clean or the quality is changed, the oil should be replaced.

6) The newly pressed and overhauled vacuum pump must be in the direction of rotation of the V-belt during the test run. The end of the work must close the switch.
Roots vacuum pump
Liquid Ring Vacuum compressor

Rotary Piston Vacuum Pump

Application Range of Liquid Ring Vacuum Pump

The liquid ring vacuum pump is equipped with an eccentric rotor with fixed blades, which throws water (liquid) to the stator wall. The water (liquid) forms a liquid ring concentric with the stator. The liquid ring and the rotor blade together constitute a variable volume rotary variable volume vacuum pump.

1. The liquid-ring vacuum pump can work continuously for a long time in the ambient temperature range of 5-40 C and the inlet pressure less than 1330 Pa.

2. The liquid ring vacuum pump is not suitable for pumping gases containing excessive oxygen, toxic, explosive, corrosive to metals, chemical reactions to pump oil, and particulate dust. It is also not suitable for transporting gases from one container to another for transporting pumps.

3. The continuous working time of the liquid ring vacuum pump under the inlet pressure from atmospheric pressure to 6000Pa is not more than 3 minutes, so as to avoid damage of the pump caused by oil injection or poor lubrication.

water-ring-vacuum-pump-system-for-industrial-gas

316L-stainless-steel-water-ring-vacuum-pump

Vacuum Coating Technology for Piston Vacuum Pump

Vacuum coating, in fact, is a technology of producing thin film material by physical method. This technology can effectively protect liquid ring vacuum pump and reduce pump damage. It can be separated from the heating source and hit the surface of the plated pump. Today we will introduce the vacuum coating technology in detail.

Vacuum coating technology is an important branch of piston vacuum pump application technology. It has been widely used in the fields of optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, appearance science and scientific research. The main methods of vacuum plating are evaporation plating, sputtering plating, ion plating, beam stacking plating and molecular beam epitaxy. In addition, there is chemical vapor deposition method.

If the purpose of vacuum coating is to change the physical and chemical properties of the piston vacuum pump, this technology is an important part of the piston vacuum pump surface disposal technology. This paper gives a brief introduction to its several main applications. In optics, a thin film or layers of different substances coated on the surface of an optical glass or quartz can be used as a high reflection or non-reflection (i.e. antireflective film) or reflective or transmissive material in any desired proportion, as well as a filter for absorbing one wavelength and transmitting another.

High reflective film of piston vacuum pump is needed from large aperture astronomical telescopes and various lasers to Jasmine coated windows of new buildings. Antireflective coatings are widely used in photography and various laser start-ups, as well as coated glass for windows of new buildings, which are in great demand. Antireflective coatings are widely used in the lens of cameras and television cameras. Vacuum coating plays an important role in electronics. Various range of inherited circuits. Conductive film, insulating film and maintenance film should be used in memory, arithmetic unit and notification logic element. The chromium film is used as the mask of the fabrication circuit.

In a word, the vacuum coating technology of piston vacuum pump is actually to produce a kind of protective film to protect the vacuum pump through physical method. Although this method can reduce the number of cleaning times of the pump, in order to make the pump use longer, it is necessary to clean regularly.

Rotary-vane-vacuum-pump-in-microelectronics-industry

Piston-Vacuum-Pump-Metal-Spraying-Coating

Stainless steel vacuum pump installation

There are many ways to install stainless steel vacuum pump. How much do you know about its mechanical installation? Let's get to know it together.

1. Connect the power supply according to the motor label, and install the grounding wire and the appropriate fuse and thermal relay.

2. In the connecting pipeline, users can install valves and vacuum gauges above the inlet of the vacuum pump, and check the limit pressure of the vacuum pump at any time.

3. The stainless steel vacuum pump should be installed in a strong place on the ground. There should be enough room around it for inspection, maintenance and maintenance.

4. The foundation level should be maintained under the base of the vacuum pump. It is suggested to install cushion rubber or bolt at the four corners of the base to ensure the smooth operation and low vibration of the vacuum pump.

5. The connecting pipeline between stainless steel vacuum pump and system should be sealed reliably. Oil-resistant rubber can be used to connect the sealing gasket with metal pipeline for small vacuum pump, and vacuum rubber tube can be used for small vacuum pump. The diameter of pipeline should not be less than the suction diameter of vacuum pump, and the pipeline should be short and with few elbows. When welding pipeline, the welding slag should be removed from the pipeline, and it is strictly forbidden to enter the vacuum pump chamber.

6. When the vacuum pump is electrified and tested, the motor belt must be removed to confirm that the vacuum pump steering is in accordance with the specified direction before it can be put into use, in order to prevent the reverse injection of oil into the vacuum pump. (steering in the direction indicated by the shield)

7. For stainless steel vacuum pumps with cooling water, the cooling water shall be connected according to the regulations.

8. When the solenoid valve is installed at the vacuum pump mouth, the valve and the vacuum pump shall operate simultaneously.

9. When the exhaust gas of the vacuum pump affects the working environment, the oil mist filter can be installed in the exhaust outlet.

Oil-free-vacuum-pump-in-aeration-process

Vacuum-System-in-Vacuum-Concentration

Factors Influencing Pumping Speed of 2BV Vacuum Pump

The pumping speed of 2BV vacuum pump is the problem we are going to discuss today. What are the factors that affect the pumping speed?

1. The flow conduction U is very large, that is, the amount of gas passing through it is not limited, so the pumping capacity of the pump depends on its own pumping speed, which is the same as the direct connection between the pump mouth and the vacuum chamber.

2. The gas extracted from the suction port of the vacuum chamber must pass through the flow guide U to be pumped out by the vacuum pump, except that the exhausted gas moves from the suction port of the vacuum chamber to the pump port from the high pressure to the low pressure, while the exhausted gas from the pump port is a forced flow from the low pressure to the high pressure based on some suction principle.

3. The connection pipeline between 2BV vacuum pump and vacuum chamber can include cold trap and valve. Assuming that the flow conduction between pump and vacuum chamber is U, the pump must pass the flow conduction U to suction the vacuum chamber, and its suction capacity should be limited. At this time, the effective suction at the suction port of vacuum chamber is the real meaningful suction to the container. Speed S0.

4. If the pumping speed of 2BV vacuum pump is very high, that is to say, the pump's actual pumping capacity does not depend on its pumping speed, but on the gas's ability to pass through the U. The value of the flow conductivity is S0.

5. According to the basic vacuum equation, two extreme results can be obtained mathematically. That is, when the flow conductivity U is very large, the pumping speed of 2BV vacuum pump can be approximately equal to the pumping speed S of the pump. When the pumping speed S of the pump is very large, or the flow conductivity U is very small, the effective pumping speed of the vacuum chamber is approximately equal to the flow conductivity U.

Oil-free-vacuum-pump-for-chemical-industry

Liquid-Ring-Vacuum-Pump-for-Special-Gas-Environment