Exhaust valve structure of rotary vane vacuum pump

In order to improve the service efficiency and service life of the oil sealed vane vacuum pump, the structure of the exhaust valve of the general oil sealed vane vacuum pump has been greatly improved and put into the market. It has been widely used in all walks of life in the above harsh media environment, and has achieved remarkable economic and social benefits.

The biggest disadvantages of these two structures are:

A when the high pressure and strong gas are removed by the pump for a long time, the phenolic pressure plate and spring steel sheet are frequently in the limit state of stress, which is easy to deform, lose elasticity or even break. The oil resistant rubber valve is easy to be corroded and deformed by the pumped medium and cause aging;

B. when the discharged medium acts on the exhaust valve plate and deviates from the fixed bolt of the valve, the frequent eccentric limit impact will easily loosen the bolt. In this way, not only the performance of the pump is decreased and the maintenance rate is increased, but also the pump oil is easily returned to the pump cavity from the exhaust port, which makes it difficult to start.

By improving the exhaust valve of the vacuum pump, two groups were set up. One group is the large exhaust valve with high spring force, which is used to exhaust together with the small exhaust valve within the pressure range of atmospheric pressure ～ 103pa; the other group is the small exhaust valve with low spring force, which is used to exhaust when the pressure is lower than 103pa, so as to reduce the limit pressure. It can be seen from the structure of the exhaust valve that the force of the pumped medium discharged from the pump cavity acting on the metal exhaust valve plate is uniform, and the stroke of the valve plate is limited by the valve body. Therefore, the effective life of the special heat-treated exhaust valve will be far longer than the previous one. At the same time, the contact surface between the exhaust valve plate and the exhaust valve seat has been specially processed. Under the effect of the spring preload, the sealing performance of the exhaust valve plate to the oil is very good. Moreover, the force acting on the fixing bolt of the exhaust valve is symmetrical, and the possibility of bolt loosening is very small.

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Use of Roots vacuum unit

The continuous development of science and technology has promoted the upgrading of products in various industries, and roots vacuum unit is the superior product brought by the progress of the times. Roots vacuum pump is a kind of variable volume vacuum pump with good performance, but we should avoid some misunderstandings when using, which may bring great impact on our production and operation. So what mistakes should we pay attention to? Let's talk about them one by one.

1. If the vacuum degree of Roots vacuum unit is reduced during the use, it is necessary to check whether the gap between the rotors of roots pump has changed to some extent. If the gap between the rotors of roots pump becomes larger, it is necessary to replace the roots pump, because this kind of roots pump does not make static and dynamic balance for the rotors of roots pump in the production and processing process, or uses shaft sleeve seal Of.

2. Roots vacuum units are mostly used in Roots vacuum units, which are mainly used to improve the pumping speed and vacuum degree. The middle distribution between roots vacuum pump and the front pump needs to be equipped with a bypass valve, which can effectively protect roots pump. If the front pump is not stable, then roots pump will play an effective role in protecting the whole life of the vacuum pump unit Life will be prolonged.

3. The roots vacuum unit must be equipped with a front stage pump when it is used. Roots pump cannot be used alone.

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How to select vacuum pump correctly for vacuum packaging machine

How to select vacuum pump correctly for vacuum packaging machine?

At present, many customers in the purchase of vacuum packaging at the same time of the selection of vacuum pump is unclear, vacuum packaging machine in general with what vacuum pump?

Vacuum pump is the core part of the vacuum packaging machine and the center of the vacuum packaging machine. It has a great influence on the packaging effect, service life and failure rate during the use of the vacuum packaging machine. How to select vacuum pump correctly for vacuum packaging machine?

The domestic vacuum pump generally refers to the vacuum pump produced by a wholly domestic enterprise, which is characterized by low price and general quality. In the process of use, the vacuum effect is not obvious and the use performance is not stable. But the general small vacuum packaging machine can use the domestic vacuum pump. Because the vacuum chamber of the small vacuum packaging machine is small, the vacuum effect can achieve the effect of vacuumizing in a small range of space and time, so it is no problem to use the general vacuum pump.

If some users choose medium-sized or large-scale vacuum packaging machines, small editors suggest using joint venture vacuum pumps or imported vacuum pumps. After all, as the equipment needed for production, the performance, service life and failure rate of vacuum packaging machines can directly meet the current production needs. In addition, domestic vacuum pumps are more suitable for small-scale production and large-scale production It is not recommended for mass production.

Roots Vacuum Pump

Piston Vacuum Pump

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What about the leakage rate of water ring vacuum pump

What about the leakage rate of water ring vacuum pump?

With the development of vacuum industry, water ring vacuum pump has been widely used. In use, the most difficult problem for users is to detect the leakage rate of water ring vacuum pump. And it includes internal leakage and external leakage. The external leakage is better to detect, while the internal leakage is more difficult to handle. Here is a brief introduction to the leakage rate detection of the water ring vacuum pump:

1. Most of the internal leakage occurred on the equipment with water-cooled jacket. No doubt was found through checking the external leakage, but there were the following phenomena: the pumping speed of the mechanical pump was obviously low, the indication value of the vacuum gauge was low, the mechanical pump oil was quickly emulsified, and the iron-based parts in the vacuum chamber were obviously rusted. If the above conditions are met, internal leakage can be basically determined. Clean the inner wall first, and then pass cooling water to see if there is any wet point. The wet point is the leakage point.

2. Small leakage and micro leakage are difficult to check. The commonly used method is to use the ionization tube sensitive to some gases in high vacuum state to detect leakage, such as acetone or ethanol. Use a medical syringe to spray acetone or ethanol to the suspicious place. When it is sprayed to the leakage point, the pointer of the ionization meter will swing obviously. In this way, it is necessary to be patient and wait until the indicator value of the ionization meter is stable - that is, the pumping capacity and leakage rate of the vacuum unit are balanced, and then spray. It is better to repeat several times to confirm the leakage point.

3. For larger leakage point, flame method can be used. Based on the principle that air flow can make the flame deviate, vacuum first. For example, use candle or lighter to gradually search around the suspicious point, and it will be found that the flame deviates to the leakage point, then the leakage point can be found.

4. The stainless steel water ring vacuum pump can be selected. It has strong corrosion resistance and will not be used properly!

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How to use vacuum solenoid valve in vacuum system

How to use vacuum solenoid valve in vacuum system?

How to use vacuum solenoid valve in vacuum system Vacuum solenoid valve is a special valve for vacuum installed on mechanical vacuum pump. The valve and the pump are connected to the same power source. The opening and stopping of the pump directly control the opening and closing of the valve. How to use vacuum solenoid valve in vacuum system?

Vacuum solenoid valve is a special vacuum valve installed on a mechanical vacuum pump. The valve and the pump are connected to the same power source. The opening and stopping of the pump directly control the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and fill the atmosphere into the pump cavity through the air inlet of the pump to prevent the pump oil from flowing back and polluting the vacuum system. The working medium for vacuum solenoid valve is air and non-corrosive gas.

How to use the vacuum solenoid valve in the vacuum system mainly includes the following points:

1. Before installing the vacuum solenoid valve, you should carefully read the instruction manual of the product, check whether the product fully meets the requirements for use, be familiar with the installation points, and make preparations.
2. During installation, the coil of the vacuum solenoid valve is upward and maintains a vertical position. The arrow or mark on the ZCA vacuum solenoid valve should be consistent with the flow direction of the pipeline.

3. Ordinary vacuum solenoid valves should not be used in flammable and explosive dangerous places.

4. When the vacuum solenoid valve fails, in order to isolate the ZCA vacuum solenoid valve in time and ensure the normal operation of the system, it is best to install a bypass device.

5. Do not install the vacuum solenoid valve in the low recess of the pipeline, so as to avoid steam condensate, impurities and other deposits in the valve and hinder the action.

6. In the case of insufficient pipeline rigidity, it is recommended to fix the front and rear pipes of the vacuum solenoid valve with a bracket to prevent vibration caused by the ZCA vacuum solenoid valve during operation.

7. Before taking over, fully flush the pipeline with a pressure of 0.3MPa to completely remove the metal powder sealing material residues and rust in the pipeline; the working medium of the vacuum solenoid valve should be clean and free of particles; impurities, it is recommended to install a filter in front of the valve. Install steam traps in the steam line; dirt and filters on the inner surface of the inlet solenoid valve must be cleaned regularly.

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Scale problem of Roots vacuum pump unit

After using roots vacuum pump unit for a period of time, the problem of scaling is very common. Although this is not a very serious problem, if we can't deal with it well, then small problems will become big problems. Therefore, if we want to make the product more useful, we should pay attention to all the problems.

In the paper industry, the working medium of Roots vacuum pump unit (i.e. make-up liquid) is mainly tap water or paper white water. Due to the high hardness of tap water and the complex metal ion composition in white water, it is said that the internal fluid components of vacuum pump will form scale after a long-term physical and chemical process under such medium conditions.

After scaling, the pumping rate of Roots vacuum pump unit will be reduced. As there is scale between the impeller blades and on the inlet and exhaust windows, the volume of the sealed chamber is obviously reduced, and the volume of the inlet and outlet gas is naturally reduced. When the scale almost fills the space between the blades or the inlet and exhaust windows are almost filled with scale, the intake and exhaust volume is almost zero, and the vacuum pump also loses the function of vacuum extraction.

After scaling, not only the pumping rate is reduced, but also the power consumption is increased. Due to the formation of scale, the exhaust window is reduced, and the compression ratio of the gas in the small room is increased when it is discharged from the window, resulting in the increase of power consumption, which is about 10%.

Through the above introduction, we all know the harm of scale to roots vacuum pump unit, so this problem is worthy of the attention of customers, and at the same time, we should also pay attention to the impact of the use environment when using vacuum pump. In fact, for mechanical equipment, if there is too much scale, it may affect the efficiency and service life of the equipment, so I hope you can pay more attention to it.

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Vibration source of water ring vacuum pump unit

There are many kinds of vibration sources in the working process of water ring vacuum pump units. They are not only the vibration source of the pump itself rotating movement, but also the vibration excitation of the prime mover (such as motor, diesel engine, etc.). When the chemical pump fails, there is also an impact effect inside its components, and at the same time, the water flow will also have a certain impact effect. Here is a brief introduction.

So many vibration sources mixed together will inevitably affect each other, and the fault signal is often submerged in the background noise and interference, which brings great difficulty to the pump fault diagnosis. The existing signal analysis methods have not made a breakthrough in the separation of vibration signals from multiple excitation sources and the feature extraction of vibration signals with low signal-to-noise ratio, but still need to do more Step by step.

At present, people mainly use data-based machine learning method for pump fault classification. The characteristic of this method is that a large number of sample data is needed, but when the sample data is difficult to obtain, this method shows its limitations. Therefore, it is necessary to study a small sample fault pattern classification method with higher generalization ability, so that it can use limited data samples to get better diagnosis results.

Water Ring Vacuum Pump

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