rotary vane mechanical vacuum pump working principle and precautions

The vacuum pump unit is used to extract the gas in the blocking system to obtain vacuum. At present, rotary vane vacuum pump unit is widely used in refrigeration maintenance work. It can pump the gas in the refrigeration system from 105Pa to below 1pA.

The rotor with two sliding blades is installed in the stator cavity. The outer circle of the rotor is tangent to the surface of the pump cavity. When the pump rotor rotates, the top of the rotating blade is in contact with the inner wall of the pump chamber by centripetal force and spring pressure. Driven by the motor, the eccentric rotor drives the vane to rotate in the stator cavity, which gradually expands the volume of the air inlet chamber. The air pressure drops and inhales gas. At the same time, the volume of the chamber connected with the exhaust port is gradually reduced, and the air pressure increases. After reaching a certain pressure, the exhaust valve is opened to discharge the gas, so as to achieve the purpose of extracting gas and obtaining vacuum.

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Installation and operation steps of chemical centrifugal pump

Chemical centrifugal pump refers to the centrifugal pump used in the chemical field. Compared with other types of pumps, chemical centrifugal pump has the advantages of simple structure, not easy to wear, stable operation, low noise, uniform water outlet, convenient adjustment and high efficiency, so chemical centrifugal pump has been widely used.

The key to the installation technology of chemical centrifugal pump is to determine the installation height (i.e. suction head) of chemical centrifugal pump. This height refers to the vertical distance between the water surface of the water source and the center line of the impeller of the chemical centrifugal pump. It can not be confused with the allowable vacuum height. The allowable suction vacuum height on the chemical centrifugal pump product manual or nameplate refers to the vacuum value on the water inlet section of the chemical centrifugal pump, and is measured by test under 1 standard atmospheric pressure and water temperature of 20 ℃ Yes. It does not take into account the water flow condition after the matching of the suction pipe. The installation height of chemical centrifugal pump should be allowed to absorb the vacuum height, after deducting the loss of suction pipe head, the remaining part of the value, it should overcome the actual terrain suction height. The installation height of chemical centrifugal pump should not exceed the calculated value, otherwise, the chemical centrifugal pump will not be able to pump water.

The working principle of chemical centrifugal pump is that when the pump is full of water, the impeller rotates to produce centrifugal force. The water in the impeller channel is thrown out and flows into the pump shell under the action of centrifugal force, so the pressure at the center of the impeller decreases, which is lower than the pressure in the water inlet pipe, and the water flows into the impeller from the suction tank under the effect of this pressure difference. In this way, the pump can continuously absorb water and supply water continuously.

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Adjustment mode of horizontal multistage centrifugal pump

What are the two most commonly used adjustment methods of horizontal multistage centrifugal pump. The simplest way to change the flow rate of centrifugal pump by valve throttling is to adjust the opening of outlet valve of pump, while the speed of horizontal multi-stage centrifugal pump remains unchanged (generally rated speed), its essence is to change the position of pipeline characteristic curve.

The simplest way to change the flow rate of centrifugal pump is to adjust the opening of pump outlet valve, while the speed of horizontal multi-stage centrifugal pump remains unchanged (generally rated speed), its essence is to change the position of pipeline characteristic curve to change the operating point of pump. The intersection point of pump characteristic curve Q-H and pipeline characteristic curve Q - ∑ h is the limit operating point of the pump when the valve is fully open. When the valve is turned down, the local resistance of the pipeline increases, the pump operating point moves to the left, and the corresponding flow decreases. When the valve is fully closed, the resistance is infinite and the flow is zero. At this time, the pipeline characteristic curve coincides with the ordinate. It can be seen that when the flow is controlled by closing the valve, the water supply capacity and head characteristics of the multi-stage centrifugal pump remain unchanged, and the pipe resistance characteristics will change with the change of valve opening. This method is easy to operate, continuous flow, can be adjusted between a certain maximum flow and zero, and no additional investment is needed. But throttling regulation is to consume the excess energy of centrifugal pump to maintain a certain supply, and the efficiency of centrifugal pump will also decline, which is not reasonable economically.

The deviation of operating point from high efficiency zone is the basic condition for pump speed regulation. When the speed of multi-stage centrifugal pump changes, the valve opening remains unchanged (usually the maximum opening), the pipeline system characteristics remain unchanged, and the water supply capacity and head characteristics change accordingly. When the required flow is less than the rated flow, the head of variable frequency speed regulation is smaller than that of valve throttling, so the water supply power required by frequency conversion speed regulation is also smaller than that of valve throttling. Obviously, compared with valve throttling, the energy-saving effect of frequency conversion speed regulation is very prominent, and the working efficiency of horizontal multistage centrifugal pump is higher. In addition, the adoption of variable frequency speed regulation can not only reduce the possibility of cavitation of centrifugal pump, but also prolong the start-up / shutdown process by preset the time of speed up / down, which greatly reduces the dynamic torque, thus eliminating the destructive water hammer effect to a great extent, and greatly prolonging the life of the pump and pipeline system.

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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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