What is the ambient temperature of the vacuum pump

 

What is the ambient temperature of the vacuum pump? Too high or too low temperature will affect the operation of the equipment and affect many operations of the equipment. Therefore, users should learn to adjust the temperature and always keep the equipment above a good temperature. So what is the appropriate ambient temperature to use it? 1. Gas analysis and partial pressure measurement under vacuum conditions are usually completed by dynamic mass spectrometer. If the medium to be transported contains solid particles, a filter screen shall be added at the pump inlet; If ferromagnetic particles are contained, a magnetic filter shall be added. 2. The ambient temperature of the vacuum pump in use shall be lower than 40, and the temperature rise of the motor shall not exceed 75. After 1000 hours of normal operation of the magnetic pump, remove the bearing and end face moving ring, check the wear, and replace the vulnerable parts that cannot be reused. For the medium easy to precipitate and crystallize, clean the conveying liquid immediately after use and discharge the liquid accumulated in the pump. The vacuum pump must always be clean. No other articles shall be placed on the vacuum pump, and the channels around the pump shall not be blocked. Always pay attention to the tightness of the V-belt and adjust it. Always pay attention to whether each pipe joint leaks and whether the pre vacuum in the box is reduced, otherwise it needs to be repaired in time; Always pay attention to whether the cooling water is unblocked. Start intermittently 4-6 times within 2S each time to overcome the large torque during startup. Here, we need to know the ambient temperature of the vacuum pump, and we must measure whether the ambient temperature meets the corresponding normal range before formal use. In addition to keeping the vacuum pump at a good temperature, we must also do a good job in heat dissipation.

Liquid Ring Vacuum Pump Used in Block Moulding Machine in EPS Production

Maintenance problems in practical application of vacuum pump

Vacuum pump is the main force of many science and technology, and provides necessary conditions for the operation of many laboratory application equipment. Unfortunately, if the pump is exposed to acid or organic chemical fumes for a long time, it will cause some practical maintenance problems. Especially for the oil sealed rotary vane pump, exposing the oil to chemical steam will lead to oil deterioration or decomposition, which will affect the function of the oil mist separator of the vacuum pump.
Many applications require a high degree of vacuum, so vane pumps are required. These high vacuum pumps are essential for installing the vacuum pump oil mist separator.
1: Read the instruction manual carefully
After purchasing the pump, carefully read the manual, check the operation precautions, select the appropriate vacuum pump oil according to the suggestions in the manual, and select the vacuum pump oil fume filter according to the pump model. The manual usually recommends the time of oil change.
2: Warm up the pump
Run the pump for 20-30 minutes before connecting it to the vacuum system. Consider installing manual valves to facilitate the preheating process.
3: Do not block the pump outlet
The pump outlet is blocked, which will cause the pump to stop working. In the worst case, overpressure in the pump may loosen the seal around the oil mirror glass, resulting in leakage and maintenance. Install the vacuum pump oil mist separator to make the air flow more stable.
4: The inlet cold trap is used to protect the pump from corrosive steam
The cold trap at the inlet can not only protect the pump from corrosive steam, but also reduce the steam load on the pump, so it can work more effectively. Ensure that the temperature of the solvent is low enough, such as using liquid nitrogen (for highly volatile solvents).
5: When handling condensable vapors, use gas ballasts
The air ballast of the vacuum pump uses air to push the condensate to the outlet through the pump. For applications with high steam load and corrosive gas, the mixing pump (diaphragm pump / rotating blade combination) will maintain the vacuum state of the oil storage tank and continuously distill steam and corrosive gas from the pump oil, so as to reduce corrosion and greatly prolong the service life of the pump. The oil change cycle also extends the replacement cycle of the vacuum pump oil mist separator.
6: Use an air inlet filter to protect the pump from particulate contamination
Use the air inlet filter to remove abrasive particles from the pump oil and rotating equipment. Reduce the pump oil pollution caused by impurities, and cooperate with the oil fume filter of the vacuum pump to effectively improve the performance of the vacuum pump.
7: Run the pump after use to remove the solvent from the oil
After completing the operation, you need to open the air ballast, close the air inlet and let the pump run for a few minutes. By operating the pump near the maximum vacuum but with good air circulation, many solvents dissolved in the oil can be removed, thereby reducing internal corrosion during shutdown.

Liquid Ring Vacuum Pump Used in Block Moulding Machine in EPS Production

Precautions for leakage detection of screw vacuum pump

 Leakage detection must be carried out before screw vacuum pump is put into operation. If the operation is not correct, the vacuum pump will be damaged. The following points shall be considered when detecting leakage:

First, it is necessary to find out whether the test piece can bear positive pressure and how much pressure it can bear, so as to determine whether the extraction leakage test method and the gas that can be filled with pressure can be used.
Before detecting the leakage of screw vacuum pump, the weld shall be carefully cleaned to remove welding slag, oil stain and dust.
The light at the leak detection part shall be sufficient, the bottom of the sink shall be dark, the water shall be clean and transparent, and there shall be no steam and fog on the water surface.
The test piece shall be inflated first and then put into water. Otherwise, if there is a large leak, water may enter the container under inspection and the small hole may be blocked by water. Before putting them into the water, please use the monitoring method to check whether there is a large leakage, and then put them into the water after eliminating the large leakage, otherwise it will affect the detection of small leakage.
When the screw vacuum pump specimen is placed in water, bubbles may appear on the surface of the specimen. If these bubbles are erased or punctured and the bubbles no longer appear, it can be judged that there is no leakage. Where bubbles are initially generated. If bubbles appear regularly and continuously, there will be leakage where bubbles are generated.
The inspected part shall be kept stable in the water and observed after the water surface is flat. The inspection position of screw vacuum pump shall be as close to the water surface as possible. If any leakage is found, mark it in time. If there is a large leak, check the small leak after repair.
In short, the screw vacuum pump can only be put into use after passing the leakage detection; Otherwise, unnecessary damage will be caused for future use.

Water Ring Vacuum Pump System Used in Automotive Semiconductor

Analysis on damage factors of dry screw vacuum pump

 1、 Analysis on the causes of corrosion on the rotor surface of screw pump the feed medium of vacuum pump contains sulfur dioxide and water. Sulfur dioxide combines with water to form sulfurous acid. Sulfurous acid has corrosive effect on metal. In order to prevent corrosion of rotor and pump cavity, Teflon layer is coated on the surface of rotor and pump cavity. Corrosion of rotor and pump chamber indicates that the layer is damaged and sulfite has corroded to the pump chamber. 2、 Cause analysis of Teflon layer damage in rotor and pump chamber there may be three reasons for the damage of Teflon layer on the surface of rotor and pump chamber: first, solid particles enter the pump chamber and cause coating damage. Second, chemicals form colloid on the pump cavity and rotor

1、 Cause analysis of surface corrosion of screw pump rotor
The feed medium of the vacuum pump contains sulfur dioxide and water. Sulfur dioxide combines with water to form sulfurous acid. Sulfurous acid has a corrosive effect on metals. In order to prevent corrosion of rotor and pump cavity, Teflon layer is coated on the surface of rotor and pump cavity. Corrosion of rotor and pump chamber indicates that the layer is damaged and sulfite has corroded to the pump chamber.
2、 Failure analysis of Teflon layer in rotor and pump chamber
There may be three reasons for the surface layer damage of rotor and pump chamber:
First, solid particles enter the pump cavity, which causes coating damage.
Second, chemicals form colloid on the pump cavity and rotor, which carbonizes and hardens and destroys the coating of rotor and pump cavity.
Third, other reasons.
1. Failure analysis of solid particles
Check the pump inlet equipment and pipeline, and no free moving solid particles such as metal fragments and iron chips are found.
2. Analysis of colloidal carbon deposition failure
Fig. 1 is a picture of the attachment on the inner wall of the pump inlet pipe. The substance is dark brown. After analysis, it contains iron, carbon and oxygen. It is a polymeric substance such as butadiene and sulfolane, which is bonded to the inner wall of the pipe. If the substance adheres to the pump cavity and rotor surface, it is easy to carbonize and harden, thus damaging the rotor surface layer.
3. Process factor analysis
The gas phase outlet pressure of the vacuum pump is 80kPa (a), which is negative pressure, while the liquid phase outlet of the pump is normal pressure. Under normal circumstances, the liquid at the pump outlet cannot normally enter the underground liquid tank, resulting in backflow, resulting in the accumulation of liquid substances at the pump outlet. These liquid substances contain sulfurous acid, and the accumulation of sulfurous acid at the pump outlet forms impact corrosion to the vacuum pump, It should be said that the backflow of liquid at the pump outlet is the main reason for the corrosion of pump rotor and pump cavity.

Dry screw vacuum pump for yarn steaming machine

What should be paid attention to when using roots vacuum unit?

Now our industries are some modern industries, and pump products are an indispensable part of some enterprises. There are many kinds of pump products, and their functions are relatively comprehensive. Roots vacuum pump unit is a widely used equipment in industry. Next, let me introduce the misunderstandings that should be paid attention to when using roots vacuum pump unit.

1. The roots vacuum unit must be equipped with a front stage pump, and the roots pump cannot be used alone.
2. When selecting roots vacuum unit, we should pay attention to the sealing mode of vulnerable parts of roots pump. The mode of mechanical sealing can effectively improve the working efficiency of roots pump. If the sealing mode of roots pump is shaft sleeve sealing, the working efficiency will be greatly reduced. We need to pay special attention when selecting roots pump.
3. Roots vacuum machine is mostly used in Roots vacuum unit. Its function is to improve the pumping speed and the vacuum degree of the front stage pump. The roots pump shall be equipped with bypass valve in the configuration connected with the front stage pump, which can effectively protect the roots pump. If the pumping of the front stage pump is unstable or other factors lead to abnormal operation of the whole unit, the roots pump with bypass valve will protect the roots pump at this time, so as to prolong the service life of the whole vacuum unit.
4. If the vacuum degree of Roots vacuum pump is reduced during use, it is necessary to check whether the clearance between roots pump rotors has changed. If the rotor clearance of roots pump becomes larger, the roots pump needs to be replaced, because this kind of Roots vacuum machine does not make static and dynamic balance for Roots pump rotors during production and processing, Or it is sealed with shaft sleeve.

Milking machine selection vacuum pump 

Lubrication and maintenance method of water ring vacuum pump

 

1. Lubricating water ring vacuum pump Since the vacuum pump and motor are integrated, only the motor bearings need to be lubricated. Under normal operating conditions (50Hz), motor bearings with class B insulation must be cleaned and added after about 8000 hours or a year. 2. Maintenance of water ring vacuum pump (1) Regularly check whether the bolts are loose, whether the air pipe leaks, whether the packing seal is fastened, whether the packing seal leaks, and whether the rotating parts have friction sound or other noise. If so, stop or repair or replace parts. (2) There shall be no sand or debris in the water. (3) If hard water is used as the working fluid, the water must be softened or the pump must be washed with solvent frequently. It is usually immersed in 10% oxalic acid for 30 minutes or in detergent used in industrial boilers for 30 minutes to remove calcium carbonate. (4) If the pump is not used for more than two weeks, drain the water in the pump, fill the suction port of the pump with 0.5L antirust agent or engine oil, and gently push the pump for less than 1s. (5) If the water ring vacuum pump is used where it may freeze at low temperature, antifreeze and corrosion-resistant working fluid, such as mineral oil, shall be used. Drain the water in the pump chamber after each use. (6) If the water ring vacuum pump does not work for a long time, drain the water in the pump and add anti rust liquid to protect the pump.

water ring vacuum pump is used for reclaiming farmland from water

Vacuum sealing wax in vacuum sealing

 

It is used as a seal at removable and immovable joints or to fill small holes in vacuum systems. The joints do not need to be polished. Its hardness and viscosity are higher than vacuum sealing grease. Vacuum sealing wax can be divided into two types: 1. Vacuum sludge. It is a kind of plastic putty made by mechanically mixing refined petroleum grease with high viscosity and low vapor pressure and mountain surplus soil. The characteristics are: good plasticity and easy to form; At the same time, the plasticity changes little with temperature, has good adhesion to metal and glass, and is not easy to be monotonous when exposed to air. It is a black mud like homogeneous body, and the saturated vapor pressure is no more than 10-3. Toto. The application temperature range should not exceed 30 ℃ to avoid softening and deformation. It is used for temporary blocking of parts in the vacuum system that are slightly vibrated and often need to be disassembled, or suspicious air leakage areas found in the system. It is especially suitable for sealing glass pipes without grinding. But it can only be used in low vacuum parts. 2. Vacuum wax: it is made of petroleum residue oil with low vapor pressure and high asphalt content after proper treatment. The characteristics are: in addition to the low saturated vapor pressure and good adhesion to glass and metal, the shrinkage force is small, and the brittleness and non cracking will not change when the temperature changes greatly. It is used for permanent sealing at the grinding joint of metal pipeline in vacuum system and blocking sand holes or loopholes on glass instruments. Its saturated vapor pressure (at 20 ℃) is generally lower than 10-6 Torr, which can be used in high vacuum part. stay Try to make it condense or soften when using, but the temperature should not be too high. It must not be directly baked and heated with open fire. The heating temperature is below 100 ℃. There are 20 #, 50 #, 80 #, and the viscosity of 80 # is the largest.

Water ring vacuum pump and water ring compressor for flue gas recovery