Pipeline design of water ring vacuum pump unit

Before using the water ring vacuum pump unit, it is necessary to design the pipeline route, because the pipeline is the main device to send and pump flammable and explosive gas. Once the pipeline route is unreasonable, it will easily lead to various troubles. Therefore, it is necessary to design a reasonable pipeline route, which is conducive to the work efficiency and stability of the unit in the later stage. So how to design a reasonable pipeline?

1. The shorter the interval between the fragmentary outlet of the water ring vacuum pump unit and the inlet of the pump, the better.

2. The less pipe turns, the better.

3. The outlet pipe shall be higher than the inlet line of the pump, and the outlet pipe shall be prevented from factors that cause greater resistance, such as climbing on the outlet pipe, right angle turning, etc.

4. The diameter of the matching inlet and outlet pipe should be different from the diameter of the commodity inlet and outlet. For example, if the vacuum is small, the receiving diameter of the matching inlet and outlet pipe can be small, but not less than 70% of the commodity inlet and outlet diameter, and the outlet diameter should be greater than or equal to the inlet pipe diameter.

5. The bend of the pipeline shall be smooth.

6. The water inlet pipeline of vacuum pump unit shall be equipped with valves to regulate the amount of water inlet, which has an impact on the vacuum degree. When regulating the water inlet, the valve shall be controlled by checking the pointer of the vacuum gauge.

Therefore, in order to ensure the normal operation of the water ring vacuum pump unit, it is necessary to achieve the correct installation, operation specifications, maintenance, etc., and all these premises are to ensure that the design of the equipment is reasonable first, otherwise the unreasonable equipment, no matter how it is operated, will not be correct, so whether it is the equipment or anything, it is necessary to lay the foundation premise first, and then carry out the next operation.

Vacuum Pump Unit Knowledge

Difference Of Vacuum Pump Oil, Compressor Oil And Refrigeration Oil

Water Ring Pump

two stage rotary vane vacuum pump principle

There are many kinds of vacuum pumps. I don't know if you are clear about the principle and precautions of each pump when you choose them again. Today, I'd like to introduce the principle and precautions of the two-stage rotary vane vacuum pump to you:

The two-stage rotary vane vacuum pump is made of ferrous metal, which is relatively accurate. The whole pump work is interrelated, so it is not suitable to remove the ferrous metal containing oxygen, toxic and explosive etching. It also does not need to be used as a compressor and delivery pump for various gases with chemical reactivity to vacuum oil. If there is a pump with air ballast, the condensable body in some place can be removed. Vacuum refers to the residual gas pressure in the pumping vessel. Partial pressure is the factory standard of our factory. The total pressure is an auxiliary standard. Thermocouple measures the total pressure of various steam and permanent gas, mehs meter can only measure the partial pressure of permanent gas, so the value of the second meter is quite different.

Double stage rotary vane vacuum pump is mainly composed of pump body, rotor, rotating blade, end cover, spring, etc. The rotor is installed eccentrically in the cavity of the rotary vane pump. The outer circumference of the rotor is tangent to the inner surface of the pump chamber (there is a small gap between the two). Two rotor blades with springs are arranged in the rotor groove to divide the stator into two chambers (high and low chambers). When rotating, the two-stage rotary vane vacuum pump keeps the top of the rotating blade in contact with the inner wall of the pump chamber. Centrifugal force and spring tension, as well as the rotation of the rotor drive the rotating blades to slide along the inner wall of the pump chamber, so that the volume of the advanced chamber periodically expands to suction, and the lower chamber periodically reduces to compress gas, and the exhaust of the exhaust valve is pushed by the pressure of gas and oil to obtain vacuum.

When the suction pressure is high (for example, suction from atmospheric pressure), the gas is compressed in the high-pressure chamber, and the pressure increases rapidly. Part of the compressed gas is discharged directly from the auxiliary exhaust valve, and the other part is compressed and passes through the middle wall. The interstage passage enters the lower chamber and is compressed again and discharged from the lower exhaust valve. At this time, the high and low chambers are exhausted at the same time; when the suction pressure is low (for example, after the pump has been running for a period of time), the gas enters from the suction port in advance. The pressure generated by the compression of the gas in the high pressure chamber is not enough to push the auxiliary exhaust valve directly into the low level chamber through the interstage channel, and then compress again and discharge from the lower exhaust valve.

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

water ring vacuum pump working principle and operation

When the gas discharged from the vacuum pump is no longer used, a gas water separator connected to the exhaust end of the pump can be used as a water tank instead of itself. After the waste water and part of the water are discharged into the gas water separator, the gas and water are separated, the gas is wiped out by the wiping gas pipe, and the remaining water is supplied to the pump for further use through the return pipe.

The impeller is installed in the pump body 2 eccentrically. Therefore, when the impeller 3 rotates, the water forms a rotating water ring 5 on the inner wall of the pump body under the action of centrifugal force. The upper inner surface of the water ring is tangent to the hub and rotates in the direction of arrow. During the first half rotation, the inner surface of the water ring is gradually separated from the hub. Therefore, a closed space is formed between the impeller blades and the water ring. With the rotation of the impeller, The space is gradually expanded, and the space gas pressure is reduced. The air is sucked into the space: during the second half rotation, the inner surface of the water ring is gradually close to the hub Yu, the space between the blades is gradually reduced, and the space gas pressure is increased. When the air pressure is higher than the exhaust port pressure, the gas between the blades is discharged, so that every rotation of the impeller, the space between the blades is sucked and discharged once, and many spaces work ceaselessly, The pump continuously draws or presses the gas.

In the process of work, work will generate heat, which will make the working water ring hot, and at the same time some water and gas will be discharged together. Therefore, in the process of work, the pump must be continuously supplied with water to cool and supplement the water consumed in the pump, so as to meet the working requirements of the pump.

When the gas discharged from the pump is no longer used, a gas-water separator is connected at the exhaust end of the pump (a water tank can be made by yourself to replace it). After the waste water and part of the water are discharged into the gas-water separator, the gas is separated, the gas is wiped out by the wiping gas pipe, and the left water is supplied to the pump for further use through the return pipe. With the extension of working time, the temperature of working water will increase continuously. At this time, a certain amount of cold water (tap water) shall be supplied from the water supply of gas-water separator to reduce the temperature of working water and ensure that it can meet the required technical requirements and performance indicators.

When it is used as a compressor, the pump exhaust 11 is connected with a gas water separator, and the gas water mixture enters the gas water separator and then automatically separates. The gas is delivered to the required system through the exhaust pipe, and the working water is discharged through the automatic overflow switch. When the gas is compressed, the working water is very easy to heat up. The water is discharged from the pump outlet, and the temperature will become higher. Therefore, at the bottom of the gas water separator, cold water should be continuously supplied, In order to supplement the discharged hot water, it can play a cooling role when asked, so that the working water temperature is not too high, so as to ensure the performance of the compressor, meet the technical indicators and meet the process requirements.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Equal pitch oil-free screw vacuum pump

The oil-free screw vacuum pump entered the vacuum industry in China in the 1990s. It is a dry oil-free vacuum pump. At present, the pump has been widely used in the high-tech industries such as chemical industry, medicine, metallurgy and electronics, and has a large share in the real air pump market.

Every time the screw rotor of the oil-free screw vacuum pump stops pumping, it can be divided into the following stages: contraction suction, equal volume transportation, adiabatic contraction and equal pressure exhaust. In each stage, the physical parameters such as quality, volume, temperature, pressure and internal energy of the pumped gas will be changed. And the exhaust power consumption and exhaust temperature of oil-free screw vacuum pump with equal pitch change with the change of inlet pressure.

Inspiratory phase. The air storage volume at the front end of the two screw rotors is indirectly connected with the air inlet of the screw pump. In the process of the screw migration and transformation, and the suction slot moving backward, the air storage volume continuously shrinks and expands. The pumped gas outside the pump enters the air storage volume under the influence of the pressure difference. The cut off air storage volume and the gas sucked outside the pump inherit and move backward to stop the air inlet of the pump Gas delivery process to pump discharge port.

The austerity phase. The compression stage is the process of gas pressure rising from suction pressure to exhaust pressure. When the contraction phase stops, the total mass of the gas in the storage space increases greatly. The pressure is the exhaust pressure, and the temperature is the hybrid temperature of the two sectors. The total energy, enthalpy and entropy are also the sum of the two sectors.

Exhaust phase. When the air storage space is connected with the exhaust port, the exhaust process of the screw pump has started. The screw rotor does the most work on the gas, which is ultimately transformed into the kinetic energy, internal energy and heat release of the exhaust gas and disappears in the cooling system and exhaust situation space of the pump.

Oil-Free Dry Screw Vacuum Pump Selection

Vacuum Pump Motor

Water Ring Pump

Characteristics of industrial roots water ring vacuum unit

Roots water ring vacuum unit is composed of Roots vacuum pump as the main pump and water ring vacuum pump as the front pump in series.

For roots water ring vacuum unit, it is more advantageous to select water ring vacuum pump as the front pump than other vacuum pumps. It overcomes the limit pressure difference when a single water ring pump is used (the limit pressure of the unit is much higher than that of the water ring pump) At a certain pressure, the defect of low air extraction rate, together with the advantages of rapid operation of roots pump, has a larger air extraction rate, especially suitable for pumping a large number of condensable mixed fatty acid steam.

Characteristics of roots water ring vacuum unit

① In the unit, there is a certain gap between the rotor and the pump cavity, and between the rotor and the rotor, so they do not touch each other and do not need oil lubrication

② The rotor of roots pump has a good geometric symmetry, which can improve the speed of rotation, and thus can produce a large pumping speed pump with compact structure

③ Roots vacuum unit has small vibration and large volume during operation

④ In the cavity of Roots vacuum pump, there is no compression phenomenon like mechanical vacuum pump, so it does not need exhaust valve. Because of this, the condensable fatty acid steam can be removed

⑤ When roots vacuum unit operates, it can start quickly, reach the limit vacuum in a short time, with small power and low maintenance cost

⑥ Roots pump has a large pumping speed in a wide pressure range (1-1000 PA), which can discharge the distilled gas quickly

Oil Diffusion Vacuum Pump

Dry Type Oilless Vacuum Pumps

industrial vacuum pumps,vacuum furnaces

Construction principle of water ring vacuum unit

The limit pressure of one pump and one water ring pump is 400pa, which can satisfy the general vacuum demand, but the scale of its application will be limited to a certain extent. If two roots pumps are used in series and combined with the water ring pump, the limit pressure of the unit can be greatly increased (up to 25Pa). Therefore, in this type, two roots pumps are generally seen in series, and then the two-stage pump is used as the front stage pump to form the unit. If a higher limit pressure is required, the combination of three roots pumps and water ring pump can be used, and its limit pressure can reach 1pA.

If it is required to deal with a lot of water vapor vacuum system, it is more appropriate to use water ring pump. However, due to its low limit vacuum degree, the limit vacuum degree of the whole unit is relatively low. Although in the vacuum pumping system with high vacuum degree, the mechanical vacuum pump with high demand limit vacuum is used as the pre-stage pump. The air ballast mechanical vacuum pump can be paralleled with the water ring pump as the front pump of the pump. During vacuum drying, the water ring pump is used for pre pumping until its water vapor is greatly reduced, and then the pneumatic mechanical vacuum pump is started to cut off the water ring pump. If it takes a long time to finish a boring situation, it needs less cooling water and power.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Water ring vacuum pump has strong corrosion resistance

Compared with the most common SK series water ring vacuum pump, the water ring vacuum pump has the characteristics of strong corrosion-resistant function, high limit vacuum degree and large exhaust volume. It is widely used in food, petroleum, chemical industry, metallurgy and other professional fields, and can also pump various gases and corrosive gases without solid particles.

There are two main shock absorption methods: to reduce the vibration of the motor and the transmission shaft, SK water ring vacuum pump is used for transmission, and the rigid connection between it and the transmission shaft is changed to elastic connection. By using elastic sleeve pin coupling, the maximum compensation displacement and compensation angle can be adjusted, so that the vibration of motor and transmission shaft can be compensated by elastic coupling, and will not be directly transmitted to sk water ring vacuum pump.

Considering that it is difficult to reinforce SK water ring vacuum pump, the method of welding "stiffener" in the outlet steel pipe is adopted. Along the inlet and outlet direction, the two end flanges of the connecting steel pipe between the expansion pipe at the outlet of SK water ring vacuum pump and the outlet valve can be welded with several steel plates of specified thickness and width according to the seller's consultation. Add the rigidity of steel pipe, reduce the deformation and resist the displacement.

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Water Ring Pump