Vacuum pump in lithium bromide hot and cold water unit

Vacuum pump in lithium bromide hot and cold water unit

1. Strong drainage steam capacity

Due to the special working conditions of lithium bromide hot and cold water units, the vacuum pump must have a high drainage steam capacity. Our 2XZ rotary vane vacuum pump has a high pump temperature and a complete gas ballast device, which makes the pump have a higher drainage steam capacity. .

2.Reliable anti-return oil safety valve

This valve plays a vital role for this pump. Direct-connected pumps from other domestic manufacturers (even Japan) do not have this device. In order to prevent oil return, an additional electromagnetic bleed-off valve is required. Since the valve plate is directly pulled by the electromagnetic force against the spring force, the current is large and the reliability is poor.

3. Easy maintenance

The high and low vacuum stages of the vacuum pump can be separated separately, positioned by positioning pins, and can be easily disassembled, cleaned and cleaned according to the instructions of the manual. In addition, we have also made some adjustments to this vacuum pump based on the application of lithium bromide refrigeration for two years to make it more suitable for this application.

2XZ Direct Drive Rotary Vane Vacuum Pump In Air Cooling Unit System


Vacuum Pump For Sealing Materials Requirements

Vacuum Pump Use Details

Research and Improvement of Rotor Blade Vacuum Pump Stator Profile

Research and Improvement of Rotor Blade Vacuum Pump Stator Profile

Rotary vane vacuum pump is a kind of small volume, light weight, low noise, convenient starting, low cost among many vacuum equipment. It can be used alone or in combination with other vacuum equipment. It is used as the foreline pump of the Roots rotary vane vacuum unit. It is widely used in laboratories, metallurgy, machinery, printing, electronics, chemicals, light industry, petroleum and medicine field.

The traditional rotary vane vacuum pump eccentrically places a rotor in the circular stator cavity. When the rotor rotates, due to the eccentric action, the rotary vane on the rotor slides against the inner curved surface of the stator under the action of centrifugal and spring forces to achieve volume change. Complete the suction and exhaust process. This causes greater friction and abrasion between the rotary vane and the pump cavity, which causes the temperature of the high-speed rotary vane pump to increase, which reduces the mechanical efficiency and working life of the rotary vane pump.

Aiming at the above disadvantages of the traditional rotary vane vacuum pump, a new type of rotary vane vacuum pump with a stator profile is proposed. The traditional rotary vane and spring structure is replaced with a through rotor. The entire rotor is placed in the rotor slot above the rotor, and both ends of the rotor contact the inner surface of the stator at the same time. When the rotor rotates, the rotating blade is driven to move, and both ends of the rotating blade always slide along the inner wall of the stator. Since the movement of the rotor is always constrained by the inner wall of the stator, the stator internal profile (also known as the pump cavity profile, hereinafter referred to as the stator profile) is a profile generated based on the rotor's movement mechanism.

Dry Screw Vacuum Pump In Fluid Delivery

Two Stage Rotary Vaccum Pumps For Freeze Drying Machine

Vacuum System In Fertilizer Manufacturing

What are the types of water ring vacuum pumps

What are the types of water ring vacuum pumps?

The water ring vacuum pumps in use are single-stage, multi-stage and single-stage series-connected ejector tandem water-ring vacuum pumps. The two-stage water ring vacuum pump has a higher ultimate vacuum than the single-stage water ring vacuum pump, and the suction volume curve drops more flatly, which is suitable for working situations where higher suction volume is still required under higher vacuum.

The two-stage water ring vacuum pump can also be used as a secondary booster pump for high vacuum pumps such as water vapor jets. The two-stage water ring vacuum pump is a two-stage impeller connected in series on the same shaft, and the main shaft is directly connected to the driving device. The two-stage water ring vacuum pump used in the condenser of the power station has two operating modes when evacuating: the starting condition at low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2Pa, which can be Stage operation; under normal operating conditions under high vacuum, the absolute pressure of the condenser is 5999.4Pa, which can be operated in two stages.

The tandem vacuum pump used in the power station is to connect an ejector to the inlet of the water ring vacuum pump to increase the suction vacuum. The atmosphere is used as the working medium and is ejected from the nozzle at a high speed. The ejected gas is drawn out, and then enters the water ring vacuum pump, where it continues to be compressed. Finally, it is discharged to the gas and water separation tank.

Vacuum Pump Measurement Method

Vacuum Pump In Different Applications Effect

Best Water Ring Vacuum Pump

Application examples of vacuum systems

Application examples of vacuum systems


The vacuum system of the equipment includes 30 vacuum pumps, 50 vacuum valves, 10 anti-oil return baffles (cold traps), a total vacuum pipe length of 500m, and a total power of 740kw. The total water consumption is 65t / h, and the compressed air flow is standard. The maximum is 2.5m3 / min.

In order to simplify the system, reduce floor space, reduce investment and operating costs, the high vacuum unit borrows the booster stage pump and foreline pump of the medium vacuum unit, and the low vacuum unit borrows the booster stage pump of the medium vacuum unit. The on-off of the gas path during the process is controlled by valves to meet the requirements of each unit.

(1) High vacuum system configuration

The ultimate pressure of the equipment is three orders of magnitude lower than the working pressure. It is necessary to solve the problem of parallel connection of medium and high vacuum units. According to calculations, two sets of JK-1200 high vacuum oil diffusion pump + roots pump + slide valve pump are used. Evacuation unit. The ultimate pressure of the unit is 1.4 × 10-4Pa, and the extraction rate is 21000L / S.

(2) Medium vacuum system configuration

The configuration of this system must meet the requirements for the displacement under working pressure. If the cabin pressure is less than 2 Pa when the rocket is ignited, the test results will be inaccurate.

(3) Low vacuum system configuration

Because a large amount of condensable gas generated during the ignition of the rocket engine is captured by the heat sink and deposited in the form of frost in the cabin, and cannot be removed by manual methods, a low vacuum system is specially configured to achieve the slow sublimation of the condensable gas and discharge it. Outside the cabin.

The system uses two sets of double roots pump + water ring pump three-stage evacuation unit to increase the vacuum degree of the unit and make it reach the pressure required for the sublimation of condensable substances. The unit's ultimate pressure is 1 × 10-1Pa, and the air extraction rate is 1200L / s.

Causes Of Vacuum Pump Failure In Paper Mill

Vacuum Pump Quality


Vacuum Degree Of Vacuum Pump

Contamination and treatment of rotary vane vacuum pump

Contamination and treatment of rotary vane vacuum pump


During the use of rotary vane vacuum pumps, particulate matter and vapors or liquids constitute unpleasant contamination.

Due to the inherent self-compensating clearance adjustment effect of the pump mechanism, it is not particularly sensitive to small mechanism damage. In most designs, plain bearings are selected to be less sensitive to dust than ball bearings. Once the dust particles are separated from the oil due to gravity, a sediment is generated in the oil pool, and it does not participate in the oil cycle until it is removed. These dust particles can be filtered with an oil filter, but it does not seem to be worth it. If the pollution is serious and the filter replacement is too complicated, it is not as easy as changing the oil. It is best to keep dust particles in a place where they can be handled before they enter the pump. For this, the use of dry filters and oily traps is most effective. The protection method chosen should depend on the volume being processed, the size of the dust particles, and the allowable pressure drop. In the case of abrasive dust particles, the surface hardness of the pump parts should be increased to extend the service life.

Substances exposed to low vapor pressure are not uncommon. These substances are condensed in the pump and mixed with the lubricant, or the lubricant is diluted, or paint-like and gel-like deposits are formed. The gas ballast method can do nothing about this. The best way is to block this vapor before it reaches the pump. However, in many cases, this is not appropriate, because the pump works in such a wide pressure range, it is difficult to design an effective trap, or due to certain pollutants, the maintenance of the trap becomes difficult. At this time, most of them are solved by regular oil change.

Corrosive pollutants can be controlled, especially when their amounts are small. Lubricants can act as a buffer between most metal surfaces and corrosives. In addition, if water condensation can be prevented, its corrosive hazards become quite limited. The use of dry gas isolation can effectively prevent atmospheric condensation in the separator. Maintaining a slightly high-pressure dry gas in the separator can prevent the influence of the humidity of the surrounding slope on the pump oil.

Soluble vapor refers to those substances that are difficult to be treated by gas ballasting, which are dissolved in oil and can be released again at the inlet side of the pump. In this case, it is best to use a two-stage pump. Atmospheric oil viscosity should be maintained to the extent that it can work. Oil regenerated with a foreline pump that is not sensitive to pollution or oil purified by vacuum distillation can work well.

Rotary Vane Vacuum Pump In Diketene Production

Water Ring Vacuum Pump In Pulp Bleaching

Vacuum Pump In Oil Transportation

Vacuum pumps in the chemical industry

Vacuum pumps in the chemical industry

In petroleum and chemical production, certain production processes are often carried out under atmospheric pressure. Any pressure lower than atmospheric pressure is called vacuum, and the degree of vacuum commonly used indicates the degree of lower than atmospheric pressure. The machine used to pump gas from equipment below atmospheric pressure is called a vacuum pump. Vacuum pumps are used in the petroleum industry for vacuum distillation, degreasing of lubricants, furfural recovery, etc. In the chemical industry, vacuum pumps are used for vacuum filtration, evaporation, concentration, drying, and crystallization of solutions. Vacuum pumps can also be used as large centrifugal pumps for drainage irrigation pumps.

Mechanical vacuum pumps can be classified into reciprocating type, rotary type (skateboard type), and water ring type according to their structural types.

Any vacuum pump generally uses the following two main parameters to indicate its working performance

(1) Air extraction rate refers to the volume of gas that the vacuum pump draws from the intake pipe under the residual pressure per unit time, that is, the production capacity of the vacuum pump (or called the worldly V), expressed in m³ or L / s.

(2) Residual pressure or ultimate vacuum refers to the lowest pressure (absolute) that the pump can reach.

A certain vacuum pump is used to suck the gas in a closed container. No matter how long the suction time is, the pressure in the container cannot be reduced to zero (that is, absolute vacuum) indefinitely. This is because when the inlet pressure is lower than a certain value, either because the liquid in the pump vaporizes, or because the air disc leaked from the high-pressure side is the same as the vacuum pump's pumping victory. , The volume coefficient is reduced to zero. Both will make the pump unable to continue to inhale fresh gas. In this case, the pressure in the container will never decrease again. The absolute pressure at this time is called the residual pressure or the ultimate vacuum.

Vacuum Pump Of Function


How To Choose Chemical Pump


Water Ring Vacuum Pump

Vacuum Pump in Concentrator Application

Vacuum Pump in Concentrator Application

The vacuum filter and large water pump (before start-up) of the concentrator need to use the vacuum pump to extract the air.

A vacuum pump is a compressor that sucks out gas from thin air spaces and exhausts it to the atmosphere. Generally, the pressure of the gas it sucks is lower than the atmospheric pressure (recently manufactured vacuum pumps can make the residual pressure in the container as large as 1 × 10-15 mm silver column), and the pressure of the exhaust gas is slightly higher than atmospheric pressure.

Vacuum pumps are also distinguished by reciprocating and rotating types, and their working principles are the same as those described above. There are two types of vacuum pumps used in ore dressing plants: wet and dry.

Dry-type vacuum pumps only suck air from a certain space (such as air in a filter), which can evacuate 98%; while wet-type vacuum pumps suck out liquid and air together and can only evacuate 85%.

In order to maintain a certain volume of the water ring and remove heat, water must be continuously circulated. In order to supply water to the vacuum pump, a special water tank is connected to the discharge pipe, and a gate valve on the tank is used to adjust the circulating water volume. The used water is placed in the box with the air. In order to avoid blade end surface abrasion, there should be no inclusions in the circulating water, otherwise the blade will be abraded, and the air extraction volume will decrease as the wear increases; the general wear should not be greater than 0.1 mm.

Vacuum Pump In Solvent Removal

Dry Vacuum Pump Influence


How To Solve Problem Vacuum Pump Not Working