Vertical Screw Vacuum Pump

 How to choose the main pump in vacuum system? 

In the design and calculation of the vacuum system, people call the vacuum pump which directly vacuumizes the vacuum container as the main pump, and the vacuum pump which maintains the pressure of the other pump below the critical pre stage pressure is called the front stage pump. In order to make the vacuum pump in the container to be pumped quickly from atmospheric pressure to the working pressure of the main pump, it is called pre pumping vacuum pump. For a vacuum system, the front stage pump of the system is often used as the pre pumping vacuum pump. The main pump here refers to the selection. In a narrow sense, it refers to the proper matching of the main pump with a reasonable front stage pump. In a broad sense, it includes the selection of the front stage pump and the pre pumping pump.

In order to determine the type of main pump, the first thing to consider is the feasibility and reliability. According to the limit vacuum degree and working vacuum degree (the limit vacuum degree of the main pump is slightly higher than the limit vacuum degree of the vacuum chamber), according to the type of gas to be pumped, the proportion of each gas, and the inclusion of dust in the gas, the true pump empty meeting the process requirements should be selected. When more than two different types of pumps are suitable for the above conditions, it is necessary to select an economically reasonable vacuum pump according to the economic indicators such as initial investment and daily maintenance costs. Then, we compare the environment and other conditions to select the best one. Therefore, it is necessary to start from the whole set of vacuum system and comprehensively consider it. It is not only necessary to make a comparison between vacuum pumps to determine.

Determine the size of the main pump, is based on the vacuum chamber in the work of the required working pressure and the maximum volume of exhaust. The working pressure in the vacuum chamber must be selected within the best pumping speed pressure range of the main pump. In addition, the size of the vacuum chamber and the pumping time should be considered, because if the volume of the vacuum chamber is larger, the pumping speed of the main pump will also increase under a certain pumping time.

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Simulation calculation of cavity clearance in twin screw vacuum pump

The temperature field distribution and deformation of the two rotors are obtained by loading the first and third kinds of thermal boundary conditions, as well as the force and displacement boundary conditions. The results show that the radial deformation of the rotor is different among different stages. Therefore, this paper makes detailed requirements for the clearance in the vacuum pump cavity, and carries out calculation. 

In the working process of screw vacuum pump, the rotor will have thermal deformation, so appropriate clearance should be reserved in the rotor manufacturing process. If the clearance is too small, the deformation is easy to cause the rotor to get stuck; if the clearance is too large, the screw vacuum pump cannot obtain a higher vacuum degree. Therefore, the calculation of clearance is very important.

At present, most of the related literature at home and abroad is focused on screw compressor, and relatively few literatures about screw vacuum pump have not made specific calculation on the clearance.

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Features of central vacuum cleaning system

The central vacuum cleaning system is composed of a dust suction host, a control system, a dust suction pipeline, a dust suction valve, and a dust suction operating component. This vacuum system is a kind of low negative pressure, high flow dust removal system. This system is often used in high-speed dust capture, dust in the air, workshop cleaning, negative pressure material transportation and so on. The users who use this system often have higher requirements for dust capture. The processing equipment used in the production process belongs to the precision processing equipment, which requires high dust control. 

When the central vacuum cleaning system is running, the dust is effectively sucked into the vacuum pipe network through the suction nozzle. Under the action of vacuum negative pressure, the dust absorbed is pumped into the vacuum cleaner along with the air flow along the negative pressure pipeline. First of all, large particles of dust pass through the air inlet guide plate and fall into the machine or dust collection bucket under the action of centrifugal force; the dust with extremely light density continues to move upward with the air flow. When the dust enters the filter room of the central dust collector, it is separated by the filter, and the clean air is discharged into the air by the exhaust outlet of the vacuum cleaner through the muffler device. The dust on the filter is completed by the automatic pulse back blowing device of the system, and the timing and back blowing alternate work are completed.

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Maintenance of vacuum pump oil mist separator

When you use the imported vacuum pump oil mist separator, you must pay attention to the cleanliness of the environment around the separator, so as to ensure the normal operation of the product. If there is a problem in the process of use, we should first know how to solve the problem, and also pay attention to the matters needing attention in the maintenance process 

First of all, we should consider that when disassembling the oil mist separator of the imported vacuum pump, we should observe the cleaning condition of the surrounding area, which may cause the separator to be polluted again due to our neglect. This will not only play a good role, but also make the situation worse. Therefore, it is necessary to take a look at the surrounding sanitation before disassembling.

What's more, when we dismantle the separator, we should handle it with care. As we may all know, the separator is made of very crisp materials. If we don't pay attention to it, it will break the separator. We just need to follow the strict disassembly and assembly.


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Detailed introduction of imported scroll pump

Vortex pump is also called vortex pump, regeneration pump, etc. Because it is by the impeller rotation when the liquid vortex motion and suction and discharge of liquid, so called vortex pump. According to different types of vortex pump, it can be divided into single-stage vortex pump, centrifugal vortex pump, stainless steel vortex pump and other vortex pumps.

At present, the flow rate of general vortex pump is 0.2 ~ 27m3 / h. The working principle of general vortex pump is that when the prime mover drives the impeller to rotate in the pump through the shaft, the liquid enters the flow channel by suction, and is thrown into the annular flow channel by the centrifugal force of the rotating impeller, making the liquid rotate in the flow channel. Because each liquid particle is affected by centrifugal force, the liquid inside the impeller is greatly affected by the centrifugal force, while the liquid in the flow channel is less affected by the centrifugal force. Due to the different centrifugal force, the liquid will make longitudinal vortex motion. The liquid circulates through the channels between the blades repeatedly by means of longitudinal vortices (Fig. 1-35). Each time the liquid passes through the passage between blades, the lift is increased once, and finally the liquid is pressed out and discharged. 

After the liquid is discharged, a local vacuum will be formed in the channel between the blades, and the liquid will continuously enter the impeller from the suction inlet and repeat the above motion process. In this way, the vortex pump suction liquid, while discharging liquid, so as to continue to work. From the working principle of general vortex pump, we can see that it is like the role of multi-stage centrifugal pump, each blade channel is equivalent to one stage, and the energy increases once the liquid passes through the channel. 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 kind of pump with high head and small flow. Compared with the centrifugal pump with the same performance, the vortex pump has small volume and light weight; compared with the positive displacement pump with the same head, its size is much smaller and its structure is much simpler. Therefore, the general vortex pump has the advantages of simple structure, compact, small volume, light weight and low cost.

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Causes of cavitation in centrifugal pump

Centrifugal pump is widely used in industry and daily life because of its simple operation, stable operation, high cost performance and easy maintenance and care. However, mechanical equipment, after a long time of continuous work, it is inevitable that equipment damage and failure problems, centrifugal pump cavitation phenomenon is one of the common faults of centrifugal pump.

Once cavitation occurs in the pump, its flow and head performance will not only decline, but also show obvious high noise and vibration. In serious cases, the liquid flow in the pump will be interrupted and can not work normally. Cavitation will also damage the flow passage parts of the pump, and even affect the pipeline system.

There are many reasons for cavitation phenomenon, such as centrifugal pump product quality problems, improper use of operators and so on. Before leaving the factory, the product will go through multiple procedures of quality inspection, so the influence ratio of human factors is greater. In the working state, the working environment and operating factors of centrifugal pump account for the vast majority of the proportion of centrifugal pump cavitation phenomenon.

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Selection skills of high temperature oil pump

 Selection skills of high temperature oil pump 

As a kind of high quality hot oil circulating pump and heat carrier pump, high temperature oil pump is an ideal matching pump in heat exchange equipment, which can transport high temperature liquid without solid particles.

The high temperature oil pump adopts self heat dissipation structure and changes the traditional water cooling structure, which makes the pump structure more reasonable, efficient and energy-saving, optimizes the product performance and greatly improves the reliability of use.

The selection of high temperature oil pump can be considered from five aspects: pipeline layout, operation and operation conditions, liquid property, liquid delivery capacity and unit head.

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