Detailed introduction of dry Scroll Vacuum Pump

Detailed introduction of dry Scroll Vacuum Pump

Dry Scroll Vacuum Pump is also called vortex pump, regeneration pump, etc. It is called dry Scroll Vacuum Pump because it sucks and discharges liquid by the action of vortex motion caused by the rotation of impeller. According to different types, vortex pump can be divided into single-stage vortex pump, centrifugal vortex pump, stainless steel dry Scroll Vacuum Pump and other vortex pumps.

At present, the flow rate of general Dry Scroll Vacuum Pump is 0.2 ~ 27m3 / h. The working principle of general vortex pump when the prime mover drives the impeller in the pump to rotate through the shaft, the liquid enters the flow passage from the suction population, and is impacted by the centrifugal force of the rotating impeller, falling into the surrounding annular flow passage, so that the liquid rotates in the flow passage. Because every liquid particle is affected by centrifugal force, the liquid inside the impeller is more affected by centrifugal force, while the liquid inside the runner is less affected by centrifugal force. Because of the different magnitude of centrifugal force, the liquid makes longitudinal vortex motion. The liquid circulates through the passage between the blades many times in the passage by the longitudinal vortex.

Every time the liquid passes through the passage between blades, the head will be increased once, and finally the liquid will be squeezed out and discharged from El. After the liquid is discharged, a local vacuum will be formed in the passage between the blades, and the liquid will continuously enter the impeller from the suction port, and repeat the above movement process. In this way, the vortex pump sucks the liquid at the same time and discharges the liquid at the same time, so as to work continuously. It can be seen from the working principle of general vortex pump that it is like the function of multi-stage centrifugal pump. Each blade passage is equivalent to one stage, and the energy increases once the liquid passes through the passage. Therefore, the head of general vortex pump is 2-5 times larger than that of centrifugal pump under the same impeller diameter, so it is a high head and small flow pump. Compared with the centrifugal pump with the same performance, the volute pump is smaller and lighter; compared with the volute pump with the same head, the volute pump has much smaller size and simpler structure. So the general vortex pump has the advantages of simple structure, compact, small volume, light weight and low cost.

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What kinds of vacuum pumps are there in the vacuum system?

What kinds of vacuum pumps are there in the vacuum system?

Vacuum system is composed of vacuum chamber, vacuum pump or vacuum unit, vacuum pipeline, vacuum valve, trap and other vacuum components, electrical control system, etc. it is widely used in electronic semiconductor industry, photoelectric backlight module, mechanical processing and other industries. Vacuum system is often composed of several vacuum pumps, which play a role in different fields according to their characteristics.

1. Main pump

The main pump is used to obtain the required vacuum degree to meet the specific process requirements of the vacuum pump. According to the different limit pressure required by the vacuum system, the limit pressure of the main pump in the selection process is generally half to an order of magnitude lower than the limit pressure required by the system.

2. Crude pump

Crude pumping pump is a vacuum pump that starts pumping at atmospheric pressure and reduces the pressure of the pumped system to that of the main pump system.

The pressure reached by the crude pump must be less than the starting working pressure of the main pump. The crude pump can also be used as a pre-stage pump.

3. Front pump

The former stage pump is a vacuum pump which maintains the pressure of the former stage of a pump lower than the critical pressure of the former stage. The pre pump can also be used as a crude pump, but it must meet the requirements of pre pumping time and vacuum degree.

At the same time, the pre vacuum condition required for the operation of the main pump shall be met by the pre stage pump; under the maximum allowable exhaust pressure of the main pump, the pre stage pump must discharge the maximum amount of gas discharged by the main pump in time, and the pumping speed of the pre stage pump shall be in accordance with the actual pumping speed of the pump at the actual inlet pressure.

4. Maintenance pump

Maintenance pump means that when the air volume in the vacuum system is very small, it can not effectively use the previous pump. Therefore, an auxiliary pump with a smaller pumping speed is equipped in the vacuum system to maintain the normal operation of the main pump or the low pressure vacuum pump required by the evacuated system.

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How to choose high quality dry screw vacuum pump

How to choose high quality dry screw vacuum pump?

Dry screw pump is a new type of vacuum pump, which is a new product of traditional vacuum pump. Because of its unique design principle, it can be oil-free and water-free, can be used as corrosion-resistant coating, and has excellent sealing design. In addition to its slightly expensive price, it will far surpass the performance of traditional vacuum pump in any aspect, and will have a great market prospect in the future.

We can select and judge high-quality dry screw vacuum pump through the following points:

1. Limit vacuum degree: of course, the lower the limit vacuum degree is, the better. At present, the domestic vacuum degree is generally about 5pa, and the imported vacuum degree is about 1pA.

2. Vibration and noise: the vibration must be small, and the noise must be less than 80 decibels.

3. If it is used in a corrosive environment, it is better to ask the manufacturer for a sample of the same coating, and take it to the factory for the test in the medium solution. The coating or coating ratio used by each manufacturer is different, and its performance will be greatly different.

4. Sealing: This is also very important, but it can only be understood from the manufacturer's recommendation. The most direct way is to determine whether there is leakage through the medium after connecting to the system.

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Oil return treatment of vacuum pump

Oil return treatment of vacuum pump

Vacuum pump is a kind of vacuum equipment commonly used in modern times. Usually, when we use it, we often add oil and lubricate it. After a long time of use, some equipment will have reverse oil. How should we deal with it.

1. The molecular weight of vacuum pump oil is large.

2. In order to reduce the limit pressure of the equipment, it is required that the saturated steam pressure of vacuum unit oil at room temperature should be low.

3. In order to make the equipment work under high outlet pressure, the saturated vapor pressure of vacuum pump oil at boiling temperature should be as large as possible.

4. The thermal stability of vacuum pump oil will not change the performance of oil due to oxidation when contacting with atmosphere. Low freezing point and low temperature viscosity.

In general, when using vacuum pump, the influence of lubricating oil on the ultimate pressure is great. In the same structure diffusion vacuum unit, in the vacuum system, the partial pressure of the pumped gas will also change with different pump oil. In the later stage, we should pay more attention to these points when we carry out oil filling treatment.

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Limit pressure of water ring vacuum pump

Limit pressure of water ring vacuum pump

When using the water ring vacuum pump, we should know the limit pressure, so that it can be well used in the production line when using, and different models will bring different pressure.

1、 Ultimate relative pressure

The relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". Because the air inside the container is pumped, the pressure inside is always lower than the pressure outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a minus sign, indicating that the internal pressure of the container is lower than the external pressure.

2、 Ultimate pressure

The pressure is how much higher the measured internal pressure is than the "theoretical vacuum". The object it compares is the theoretical vacuum pressure. Due to the limitation of technology, we can not pump the internal pressure to the value of 0 PA, so the vacuum value of water ring vacuum pump is higher than the theoretical vacuum value.

We need to pay attention to the ultimate pressure of water ring vacuum pump, and pay more attention to these points when using later.

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Assembly requirements of 2SK vacuum pump

2SK vacuum pump is widely used in machinery, petrochemical industry, pharmaceutical industry, food industry, sugar industry and electronic industry. In order to ensure the use efficiency of the equipment, we need to understand the relevant knowledge about the equipment in advance. So when the equipment is installed, we need to understand the assembly instructions of the equipment first.

1. Clean the gasket left on the fitting surface and wipe it carefully before assembly.

2. Remove the old oil in the bearing and bearing frame of 2SK vacuum pump and replace with new oil.

3. The assembly sequence is the reverse of the disassembly sequence.

At the same time, the clearance between the impeller end face and the disc on the end cover shall be adjusted during the assembly, because the size of the clearance will directly affect the performance of 2SK vacuum pump, and the total clearance on both sides must be adjusted according to the specified clearance requirements, so as to better meet the use regulations of 2SK vacuum pump.

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How to drain oil by liquid ring vacuum pump

How to drain oil by liquid ring vacuum pump

Do you know how to drain oil from liquid ring vacuum pump? Let's learn more today!

1. If you want to drain all the oil in the liquid ring vacuum pump box, you can unscrew the drain plug at the lower part of the box to drain the oil.


2. When the liquid ring vacuum pump discharges oil, the height of liquid level from the top plate of the oil tank shall not exceed 30mm to ensure the lubrication and cooling of each bearing in the pump. When the volume of Jack working chamber is too large, additional oil tank shall be set to ensure that the minimum height of liquid level after oil discharge is not less than 100mm to avoid suction.

3. After the first 500h operation of the speed regulating hydraulic Siemens liquid ring vacuum pump, the oil tank and oil filter shall be changed and cleaned. Test the oil quality by visual inspection and laboratory test, and change the oil in time when the oil quality deteriorates. The oil tank and oil filter must be cleaned at the same time when changing oil. If there are metal chips or water in the oil, find out the cause and remove the fault.

4. In a short time when the liquid level drops, the bearing is lubricated by the oil attached and the oil splashed by the plunger spring. The oil filter of the oil tank and the oil filter under the pump are made of 230 mesh / inch copper wire mesh. The oil filter mesh should be cleaned frequently to prevent blocking. When in use, the oil temperature of the oil tank should not exceed 60 ℃, and appropriate measures should be taken to cool it if necessary.

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