Main features of stainless steel magnetic pump

Stainless steel magnetic pump (hereinafter referred to as magnetic pump) is a new product which uses the working principle of permanent magnetic coupling for centrifugal pump. It has reasonable design, advanced technology, full sealing, no leakage and corrosion resistance, and its performance reaches the advanced level of foreign similar products.

The static seal is used to replace the dynamic seal in the magnetic pump, so that the overflow parts of the pump are completely sealed, which completely solves the problems of the mechanical seal of other pumps, such as running, emitting and dripping. Magnetic pump uses corrosion-resistant, high-strength engineering plastics, corundum ceramics, stainless steel as manufacturing materials, so it has good corrosion resistance, and can make the medium to be transported free from pollution.

Magnetic pump has compact structure, beautiful appearance, small volume, low noise, reliable operation and convenient maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, national defense, scientific research institutions, metallurgy, dyes and other units to pump acid, alkali, oil rare precious liquid, poison, volatile liquid, as well as circulating water equipment and filter matching. In particular, easy to leak, flammable, explosive liquid pumping. The pump is more ideal for explosion-proof motor.

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Countermeasures for high temperature of vacuum pump

The motor power and speed are matched with the imported vacuum pump and cannot be changed. The fan is installed on the main shaft of the motor. The speed of the motor determines the speed of the fan and cannot be replaced. Although increasing the number of fan blades can play a certain role, but the dynamic balance is not easy to find after the number of blades is increased. If the alignment is not good, the motor vibration will increase.

(1) The fan cover of the original vacuum pump was lengthened by 40cm, and an axial fan with the same diameter as the fan cover was installed inside. The motor power of the axial fan was 850W, the speed was 1489r / min, and the voltage was 380V. The original fan remains. The axial flow fan is equipped with another power supply control, and the axial flow fan is not interlocked with the main motor. Start the axial flow fan in time after starting the imported vacuum pump, and stop the axial flow fan 30 minutes after the vacuum pump stops, so as to make the main motor fully cooled.

(2) Regularly remove the dust on the vacuum pump motor, keep the motor heat sink clean and increase its heat dissipation capacity.

(3) Adjust the bus voltage of the imported vacuum pump to 400V.

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What is the discharge pressure of liquid ring vacuum pump

Liquid ring vacuum pump is used in many industries, so we have a lot of knowledge to know about it. I don't know how much you know about its exhaust pressure, but this article analyzes and introduces the exhaust pressure of liquid ring vacuum pump for you.

The exhaust pressure has a great influence on the suction capacity and shaft power consumption of liquid ring vacuum pump. When it is running, if the exhaust pressure is higher, the suction volume will be smaller, and the power consumption of the corresponding shaft will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity will be greater, and the power consumption of the corresponding shaft will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data should be observed in real time. When there is abnormal exhaust pressure data, corresponding measures should be taken immediately to update and transform the whole vacuum system, so that the exhaust pressure of the vacuum system can be maintained in the range of national standards or recommended by manufacturers for a long time, so as to ensure that it is always in better working conditions and effectively improve the liquid ring The overall operation mechanical efficiency of vacuum pump.

Through the introduction above, we understand that the exhaust pressure is also another major factor affecting the operation efficiency of liquid ring vacuum pump, so we need to know more about this knowledge.

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Skill of vacuum pump oil filtration and replacement

After the dust, impurities and contaminated oil sink into the bottom of the main oil tank, they flow into the auxiliary oil tank through the oil return pipe. After separation and precipitation, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary oil tank and are discharged regularly by the discharge valve. The relatively clean oil is filtered by the filter in the upper part of the auxiliary oil tank, and then enters the oil separation chamber through the oil inlet pipe, and then supplies to the end cover and pump chamber.

During the use of vacuum pump oil, due to oxidation, emulsification and various impurities mixed into the outside, some of the oil is deteriorated. When the metamorphic components and impurities reach a certain degree, the color of the oil changes, the viscosity and acid value increase, and insoluble resin like substances are precipitated, which results in the increase of vapor pressure and deterioration of performance of vacuum pump oil. At this time, the pump oil can no longer be used, and a new pump oil must be replaced.

In order to prevent the dust and particulate matter in vacuum pump oil from entering the pump cavity along with the pump oil, continuous filtering device should be set up during the operation of the pump for some technological processes. After the dust, impurities and contaminated oil sink into the bottom of the main oil tank, they flow into the auxiliary oil tank through the oil return pipe. After separation and precipitation, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary oil tank and are discharged regularly by the discharge valve. The relatively clean oil is filtered by the filter in the upper part of the auxiliary oil tank, and then enters the oil separation chamber through the oil inlet pipe, and then supplies to the end cover and pump chamber.

The filter element in the filter blocks the mechanical pollutants when the oil passes by and purifies the vacuum pump oil. The pressure gauge is often connected to the filter to show whether the filter is blocked. When the pressure increases, the oil cannot flow normally. The filter element should be cleaned or replaced.

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ejector in vacuum blowdown system

There are two kinds of ejectors used in vacuum blowdown system: atmospheric ejector and water ejector (jet pump).

Mobile vacuum toilet usually uses the high-pressure air supply provided by vehicles to produce vacuum through atmospheric ejector, which can reach -0.04mpa ~ -0.05mpa. It has the advantages of simple structure, no moving parts, low price and high reliability; the disadvantage is that the working efficiency is not high. It should be noted that in order to avoid affecting the normal braking of the vehicle when using the atmospheric injector, it is necessary to strictly calculate the air consumption of the atmospheric injector, and increase the air storage tank if necessary. However, it is relatively convenient when the air source of trains and ships is abundant.

The water ejector is mostly located in the vacuum tank or outdoor water collection unit, which takes the gas-liquid mixture collected in the vacuum pipeline as the injection fluid, and the working fluid is the circulating sewage driven by the water pump. This method has been widely used in early design, but it is rarely used at present. At the same time, the water ejector design can also be used in the vacuum toilet system of mobile vehicles.

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Vacuum pump system in beer process

In fact, we often drink beer before the final cover, also need to use the vacuum pump system for vacuumizing, mainly used in the wine filling process, and the vacuum requirements are higher. Before, one user selected 2bv5110 water ring vacuum pump of our factory, each with a power of 4kw. In the production process, the start-up of six water ring pumps was incremental (one by one). Therefore, the pump set can operate normally only when the technical conditions of the six water ring pumps are good. Since 2001, the vacuum pump unit has had frequent failures, such as insufficient vacuum degree and tripping of vacuum pump motor. Up to August 2002, we have purchased 9 vacuum pumps and 8 sets of mechanical accessories (including pump blades, distribution plates, mechanical seals, etc.) and repaired the rotor shaft of the motor for many times. The vacuum degree is only - 0.06mpa, which can not meet the production requirements of -0.085mpa, which seriously affects the quality and production efficiency of beer.

After careful analysis and demonstration, a 2BE1 series water ring vacuum pump (Power: 18kw, pumping rate: 600m3 / h) was used instead of the original vacuum pump group, and vacuum protection, water shortage protection, cavitation prevention device and water saving device were installed to ensure the high efficiency, energy saving and long-term reliable operation of the vacuum pump. In order to prevent the air and working fluid from flowing back to the vacuum pump system due to sudden shutdown and other reasons, a check valve is installed in the intake pipeline.

After the improved vacuum pump system was put into production, there was no fault, and the vacuum degree was kept at 0.084-0.092mpa. The water and electricity consumption of the vacuum pump has decreased obviously.

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Classification of mechanical pumps commonly used in laboratory

The commonly used mechanical pump in laboratory is rotary vane vacuum pump, also known as rotary vane pump. It is composed of a stator and an eccentric rotor, mainly composed of stator, vane and rotor.

The rotor is eccentrically installed in the stator cylinder, and two blades are tightly embedded in the rotor slot. Under the spring force, it is close to the stator cylinder wall, and the air inlet and exhaust port on the stator are separated into two parts. When the rotor rotates, the space of the air inlet will be gradually expanded to absorb gas, while the space of the exhaust part will be gradually reduced, and the inhaled gas will be compressed and discharged from the exhaust port, so as to achieve the purpose of vacuumizing. The vacuum pump oil is used as sealing fluid and lubricant in the vacuum pump oil with very small saturated vapor pressure.

2xz-2 rotary vane vacuum pump is commonly used in laboratory, "2XZ" refers to double-stage direct coupled pump, "X" refers to rotary vane vacuum pump, and data after "2XZ" represents pumping rate (L / s). The two-stage pump is composed of two chambers in series. Obviously, the limit vacuum of the two-stage direct coupled pump is better than that of the single-stage pump, which can reach a vacuum degree of about 10-1pa.

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