Introduction of vacuum pump unit
water ringVacuum pump unitThe roots pump is the main pump, and the water ring pump is the front pump in series. water ringVacuum pump unitThe selected water ring pump is more advantageous than other vacuum pumps as the front pump, because it not only overcomes the disadvantages of exceeding the limit pressure difference when a single water ring pump is used (the limit pressure of the unit is greatly improved compared with the limit pressure of the water ring pump) and the low pumping rate under a certain pressure, but also retains the advantages that the Roots pump can work quickly and has a relatively large pumping rate at the same time. It can be adapted to pump out a large amount of condensable steam, especially when the gas ballast oil seal mechanical vacuum pump has insufficient ability to remove condensable steam, or the solvent used can deteriorate the pump oil and affect the performance, or the vacuum system does not allow oil pollution. If equipped with explosion-proof motor and electrical appliances and comply with the corresponding rules, but also able to pump out flammable and explosive gases.
Vacuum pump unitThe function of the middle water ring pump is mainly to cause the preliminary vacuum required by the Roots pump. In general, the limit vacuum degree of the single-stage water ring pump is not high, and the pre-vacuum required by the Roots pump produced in our country is relatively high. Therefore, in fact, we generally do not use the single-stage water ring pump as the front pump of the Roots pump, but use the double-stage water ring pump with lower limit pressure as the front pump, which can be reduced.Vacuum pump unitThe limits of pressure.
The limit pressure of a pump and a water ring pump is 400Pa, which can meet the general vacuum demand, but its use range will be limited to a certain extent. If two Roots pumps are used in series and combined with the water ring pump, it can be greatly improved.Vacuum pump unitThe limiting pressure (can reach 25Pa). Therefore, in this type, it is usually seen that two Roots pumps are connected in series and then a two-stage pump is used as the front pump.Vacuum pump unitCrew. If a higher pressure is required, three Roots pumps can be used in combination with a water ring pump, and its limit pressure can reach 1Pa.
If the third-level water ringVacuum pump unitStill can not meet the limit pressure, we can use water ring pump parallel mechanical vacuum pump. This unit is mainly used for vacuum pumping systems that need to deal with a large amount of water vapor, long time and limited vacuum requirements, such as vacuum drying.
If it is required to deal with a large amount of water vapor in the vacuum system, the use of water ring pump is more appropriate, but because of its limited vacuum is not high, resulting in the wholeVacuum pump unitThe limit of vacuum is lower (this is only relatively speaking). Although in the vacuum pumping system requiring a high degree of vacuum, a mechanical vacuum pump with a high vacuum limit is required to be used as a pre-stage pump. The gas ballast mechanical vacuum pump can be connected in parallel with the water ring pump as the front pump of the pump. When vacuum drying, the water ring pump is used for pre-pumping until its water vapor is greatly reduced, and then the gas mechanical vacuum pump is turned on to cut off the water ring pump. If it takes a long time to complete the drying, the cooling water and power required are relatively small.