What is the leakage rate of vacuum pump

What is the leakage rate of vacuum pump

It refers to the flow of a specific gas through the leakage hole under specified conditions.

The leakage rate of the vacuum pump is directly related to the ultimate pressure. In the vacuum pump operating at the ultimate pressure, its gas state is close to the molecular flow, the molecular free path of the gas is large, and the gas molecules are not easy to penetrate the gap between the rotor and the relevant parts, that is to say, the time gap has a very small impact on the ultimate pressure, and the only factor that can affect the ultimate pressure is the leakage rate 。 The so-called vacuum pump has reached the limit pressure, that is, the gas leaking into the vacuum pump and the gas pumped out by the vacuum pump have reached a dynamic balance and entered a relatively stable state.

There are two methods to measure the leakage rate of vacuum pump, valve method and helium mass spectrometer method.

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Noise source of Roots vacuum pump

The noise source of Roots vacuum pump is nothing more than motor and pump head. To find out where the specific problems are, please refer to the following analysis given by the technicians of vacuum pump factory:

1. Motor noise

At present, the noise of different motors with good motor quality often covers the noise of Roots vacuum pump. First, the fan noise is generally large, which should be caused by plastic fan deformation according to analysis; second, the bearing noise caused by the use of poor quality bearings.

2. Roots vacuum pump noise

1) Rotor collision noise

It includes the collision noise between the rotor and the rotor, between the rotor and the pump body, and between the rotor and the side cover. The main reasons are: insufficient stiffness of shaft, radial displacement of rotor and gear positioning on shaft, too large or too small gear clearance, too large axial clearance of bearing, etc.

2) Gear noise

Besides the machining accuracy of the gear itself, there are also the parallelism and center distance of the two rotor shafts where the gear is installed.

3) Bearing noise

In addition to the accuracy of the bearing itself, insufficient design may also cause the increase of bearing noise, such as excessive interference in the inner and outer rings of the bearing, insufficient shaft stiffness, insufficient supply of lubricating oil, and pollution by dust, water, corrosive gas and liquid, etc.

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The correct way to start water ring vacuum pump

Vacuum in engineering technology refers to a gas state in which the pressure in a given space is lower than a standard atmospheric pressure. Water ring vacuum pump has compact structure, reliable working balance and even flow. It is often used to transport or pump flammable, explosive and corrosive gases in chemical production. The efficiency of water ring vacuum pump is very low because the impeller stirs the liquid and loses a lot of energy. Next, the correct way to start the water ring vacuum pump is introduced.

1. Confirm that the water ring vacuum pump motor has been powered on and has the starting conditions. Contact the relevant post operators to confirm that the pump does not run and the turning gear is even and flexible. Open the pump inlet valve and open the 1 / 3 valve position, start the motor, and immediately open the water injection valve on the steam water separator after starting the motor, so that the water in the pump body and the steam water separator can reach the balance state; Stop the pump immediately in case of any of the following conditions: abnormal leakage, abnormal vibration, abnormal sound, peculiar smell, spark, flue gas, and continuous current.

2. Adjust the inlet and outlet valves of the pump, make sure that the vacuum degree at the inlet of the pump is within the required range, the outlet flow is normal, and the motor current is within the normal range. Adjust the pump flow, contact the operator of the relevant post, and make sure that the pressure at the inlet and outlet of the water ring vacuum pump is stable. Note: the water ring vacuum pump is strictly prohibited from idling without liquid to avoid damage to parts; it is strictly prohibited to start the pump with full water; after the water ring vacuum pump is started, it is strictly prohibited to run for a long time without opening the outlet valve.

3. Confirm and adjust after startup: confirm that the flow and pressure of the pump are normal and stable, confirm that the vibration of the pump is normal, confirm that the external temperature of the bearing box is not more than 70 ℃, confirm that there is no leakage, confirm that the temperature and pressure of the cooling water are normal, confirm that the current of the motor is normal, and confirm that the vibration and sound of the motor are correct

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The effect of scale on water ring vacuum pump

Scale has a certain impact on the water ring vacuum pump, because the working fluid (water) usually contains calcium, magnesium and other carbonates. When the water ring vacuum pump is in normal operation, the solubility of carbonate in water decreases with the increase of heating temperature. After long-term operation of the pump, the substance gradually crystallizes and precipitates, and attaches to the disk, impeller, pump body and other components.

After long-term operation of water ring vacuum pump, the scale in the pump is serious, which often leads to the reduction of the clearance between impeller and disk. During the operation of the water ring vacuum pump, abnormal noise, excessive starting current, obvious decrease of suction and vacuum degree, etc. occur, which leads to the decrease of the efficiency of the vacuum pump.

For water ring pump, there are many factors that affect its actual operation efficiency. Therefore, in the daily operation and maintenance process, it is necessary to establish perfect vacuum pump design, transformation and selection as well as operation and maintenance measures from the aspects of temperature and saturation of suction medium, type and temperature of working fluid, exhaust pressure, liquid level and flow of working fluid, so as to ensure that the vacuum system always works under the best working conditions of the hospital. At the same time, it can effectively improve the mechanical efficiency of the vacuum system in the actual operation process

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Knowledge of choosing filter element of water ring vacuum pump

Vacuum pump, you may not know, it is not used in our family life, but it is very common in the industrial field. The machine is operated by a filter, so what is the knowledge of vacuum pump filter?

When the gas or liquid enters the vacuum pump and reaches the filter element, the cartridge in the filter element will be blocked, so that the clean liquid flows out through the filter element, so as to achieve the clean purity of the materials used, so the filter element plays a very important role.


Using the knowledge of filter element of vacuum pump

For the filter element of vacuum pump, it is commonly used in the filtration of oil mist filter, exhaust filter, water filter and other vacuum pumps. Its biggest function is to remove impurities, solid particles, some liquid oil mist in the vacuum pump, so as to effectively ensure the normal operation and work of the equipment.

Knowledge maintenance of vacuum pump filter

When the construction machinery is refueled, the refuelling tools of the filter element of the vacuum pump used by the construction machinery must be kept clean. Do not remove the filter in order to increase the filling speed. Workers should wear work clothes and clean gloves to prevent fibers and solid impurities from falling into the oil.

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Difference between stainless steel vacuum pump and water pump

Sometimes when we talk about stainless steel vacuum pump, some users will think that it is the same as water pump. In fact, they are a very different kind of thing. Let's have a specific understanding.

At present, the foreign market of stainless steel vacuum pump is mainly oil circulation mode, which mainly relies on a rotating wheel. The wheel rotates in a cavity, and the cavity is filled with fluid (oil, some water). The volume of the fluid changes periodically in a week, which leads to the periodic change of the volume of the rest of the cavity, and exhausts and inhales the gas in the suction pipe. And form a vacuum. And the pump is by centrifugal force to throw out the fluid, while forming a negative pressure to attract other fluid into the pump body. In this way, the electric energy of the motor is consumed to drive the pump wheel to convert the kinetic energy and potential energy of the fluid.

Some knowledge about stainless steel vacuum pump is introduced here. If you don't understand anything else, you can contact us. At the same time, I hope you can put forward more valuable opinions and suggestions in the process of using our products.

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What is water ring vacuum pump

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How to control the flow of stainless steel vacuum pump

Stainless steel vacuum pump is often used in our life. When it is used, it is necessary to control the flow. Next, we will introduce how to control the flow of stainless steel vacuum pump

1. Adjust the impeller diameter of stainless steel vacuum pump

This method does not use any external components, and the flow characteristic curve changes with the diameter.

2. Speed control

The change of impeller speed directly changes the flow curve of stainless steel vacuum pump, and the characteristics of the curve do not change. When the speed is reduced, the curve becomes flat, and the head and flow are reduced.

3. Bypass valve regulation

In this method, the valve and pump are connected in parallel, and its actual effect is like using a new pump system. The output head of the stainless steel vacuum pump changes, and the flow curve characteristics also change, and the flow curve is closer to the linear.

4. Outlet valve opening adjustment

In this method, the pump is connected in series with the control valve of the outlet pipeline, and its actual effect is similar to that of adopting a new pump system. The output head of the stainless steel vacuum pump does not change, but the flow curve is attenuated.

The above is the flow control method of stainless steel vacuum pump. After understanding these contents, it will be more convenient to use them in the future, and also can effectively improve the work efficiency.

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