Principle of Roots vacuum pump with direct exhaust

Roots pump uses the internal cooling method, the heat is directly taken away from the heat source by the circulating cooling air, that is, the extracted gas is cooled by the cooling air when it is compressed or discharged, so this kind of pump can be used to regulate the place where the pump can not operate. 

The pump cavity can be cooled by itself, because there is a special part of the impeller and working chamber. When this special part works, a part of the working chamber is closed, blocking the inlet and outlet. Through the special vent, the cooling gas flows out from the pressure side or enters the operation cavity again, and then fills with the cooling gas with pressure from the outlet side, and the gas circulates in this way.

The air circulation cooling roots pump is controlled by a special impeller head without additional control elements. Therefore, this kind of internal circulation cooling roots pump is the same as ordinary roots pump, with simple and clean structure. It connects the cooler and the exhaust port together, and the cooler is installed outside the pump shell, which is convenient for repair, maintenance and replacement.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Maintenance of fixed plate mechanical vacuum pump

The structure of fixed plate mechanical vacuum pump is all combined, similar to small five pieces. The exhaust valve is of the bullet type. If it is used for a long time, the bullet will also fly off, resulting in the failure of no air extraction; some pumps have manufacturing problems, the vent hole is too oblique, the bullet can not return to its original position after being lifted by the air flow, and the valve port can not be blocked, so the vacuum degree is not high. When repairing, the air outlet can be reamed into the inlay sleeve to correct the air outlet, so as to overcome the above problems. 

After several years of service, the vacuum degree of the fixed plate vacuum pump becomes worse due to wear and tear. At this time, the pieces can be disassembled and grinded against each other. After being cleaned, they can be assembled. At this time, if the tolerance between the rotor and the end face is too small, some end faces can be ground and installed again. The stator is tightened by the spring to keep it close to the rotor forever to prevent the reverse "breakthrough" of gas. Therefore, the spring has a large expansion frequency and is easy to break. If one of the two springs is broken, the pulsating sound of the exhaust valve is paroxysmal, and the fuel tank cap can be disassembled for inspection.

In winter, the viscosity of the oil sometimes becomes very large, after stopping the pump, the air is not put into the pump cavity in time, causing the oil to fill the pump cavity. When the pump is started suddenly, the oil in the cavity is difficult to be squeezed out at once. The stator is often squeezed out of the stator groove or the rotor is broken (or even the rotor is cracked), so it is impossible to pump air. When repairing, only the fixed piece is out of the way. The end of the fixed piece can be gently knocked with a wooden strip to make it return to its original position, and the belt pulley is turned on manually. After the pump oil in the cavity is discharged, the pump can be started for air extraction. If the rotor is damaged, it should be replaced with a new one. Therefore, the fixed vane pump start and normal use must comply with certain regulations, should also stipulate the oil change system on schedule.

Vacuum Pump For Meat Preservation And Vacuum Cooling

How To Replace Vacuum Pump Parts

Vacuum Pump Unit Is Used For Adsorbing Objects

Cleaning method of dust in vacuum negative pressure station

Vacuum negative pressure station is mainly used in chemical, petrochemical, light industry, pharmaceutical, papermaking, metallurgy and other occupations. Because of the particularity of the working environment, vacuum negative pressure station is easy to scale, which makes many companies helpless. 

In addition to preventing scaling of vacuum negative pressure station, cleaning is required for vacuum negative pressure station with severe circumstances. Detailed operation methods are as follows:

1. In case of severe scaling, it is necessary to dismantle and remove the scale. The key point is to remove the scale on the impeller and distribution plate (or distributor). Pay attention to adjust the axial clearance when assembling from the beginning.

2. If you don't want to dismantle the vacuum negative pressure station, you can use oxalic acid solution or hydrochloric acid to soak in the pump, and then wash the pump body with clean water after soaking. Pay attention to the concentration and soaking time when using hydrochloric acid to avoid damaging the pump body.

Roots Blower For Integrated Wastewater Treatment

Roots Blower Of Assembly Sequence

Roots Blower Positive And Negative Pressure Pneumatic Conveying Difference Between

Features of central vacuum cleaning system

The central vacuum cleaning system is composed of a dust suction host, a control system, a dust suction pipeline, a dust suction valve, and a dust suction operating component. This vacuum system is a kind of low negative pressure, high flow dust removal system. This system is often used in high-speed dust capture, dust in the air, workshop cleaning, negative pressure material transportation and so on. The users who use this system often have higher requirements for dust capture. The processing equipment used in the production process belongs to the precision processing equipment, which requires high dust control. 

When the central vacuum cleaning system is running, the dust is effectively sucked into the vacuum pipe network through the suction nozzle. Under the action of vacuum negative pressure, the dust absorbed is pumped into the vacuum cleaner along with the air flow along the negative pressure pipeline. First of all, large particles of dust pass through the air inlet guide plate and fall into the machine or dust collection bucket under the action of centrifugal force; the dust with extremely light density continues to move upward with the air flow. When the dust enters the filter room of the central dust collector, it is separated by the filter, and the clean air is discharged into the air by the exhaust outlet of the vacuum cleaner through the muffler device. The dust on the filter is completed by the automatic pulse back blowing device of the system, and the timing and back blowing alternate work are completed.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

How to determine the time needed for vacuum pumping in refrigeration system

How to determine the time needed for vacuum pumping in refrigeration system

In order to correctly use the vacuum pump in hand (such as the pumping rate of 1l / s) and make the pumping effect reach the vacuum degree required by the refrigeration system, it is necessary to correctly determine the pumping time of the pump.

The method is as follows: connect the pipeline, vacuum for 20min, and close the vacuum pressure gauge valve and stop valve. Disconnect the joint between the vacuum pressure gauge valve and the transparent nylon pipe, inject 2ml18 refrigerant oil from the pipe orifice, connect the transparent nylon pipe and the vacuum pressure gauge valve, and bend the transparent nylon pipe down as shown in the figure, so that the 18 refrigerant oil flows to the lowest place automatically, forming an oil column.

At this time, the vacuum pump is still running, slowly open the stop valve (note that it should prevent the refrigerant oil from entering the vacuum pump), and then slowly open the vacuum pressure gauge valve. At this time, the refrigerant oil flows rapidly to the direction of the pump. Because there is only 2ml of oil, it adheres to the pipe wall in the flow process, and then returns to form an oil column This process goes on and on. At the beginning, a number of small oil columns are formed. With the increase of the vacuum degree in the refrigeration system, the air flow decreases, and the oil column changes from small to large, from fast to slow. When the large oil column is to be formed, it will not move within 5min, and the vacuum pumping time used will be recorded, that is, the time required for the vacuum pumping of the vacuum pump in the future.
VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

Oil Change Processing Matters of Vacuum Pump Unit

Whether it is a vacuum pump unit or any other mechanical equipment can not be separated from lubricating oil, because lubricating oil can effectively assist equipment better work. But this lubricant can not maintain the efficacy of life, it needs to change oil according to the use of the unit, because after a long period of work, the internal oil quality of the unit will be polluted by various external factors. If the new lubricant is not replaced in time, it will cause damage to the unit.

1. Vacuum pump unit in oil exchange, first of all, we should pay attention to the removal of the pump vacuum system.

2. After that, one end of the chassis motor should be padded higher, the oil plug should be opened, the unit rotated, and the exhaust port should be covered, so that all the dirty oil in the chamber can be discharged from the oil outlet, and then the new oil 100-500ML should be added from the intake port to rotate continuously for more than 5-10 revolutions to clean the interior, according to this operation for 3-5 times.

3. After the dirty oil is discharged, the oil stopper is installed, the pump is leveled, and new oil is added from the intake port and the filling hole respectively, and the oil exchange is completed.

4. The vacuum pump unit should not start the motor for a long time when changing oil. At this time, it will make the exhaust valve runout too intense and fatigue.

5. The oil exchange of vacuum pump units should also be strictly prohibited from using kerosene, gasoline and alcohol for non-disassembly cleaning of pumps.

6. If the pump stops for a long time, we should take off the exhaust hood and put the exhaust plug on it, close the intake port and drain the water.

You should know that the effect of lubricating oil on vacuum pump unit is very good. It can not only reduce the wear and tear of the internal parts of the unit, but also make the parts run smoothly and flexibly. But if the lubricating oil is polluted and filled with impurities, these good effects will become bad and aggravate the parts. The degree of wear and tear makes it unable to work properly and so on.

Industrial-roots-vacuum-pumps-price

Mini-Electric-Rotary-Vane-Air-Conditioning-Vacuum-Pump

Hot-Sale-High-Efficiency-Rotary-Vacuum-Pump-price

Single-stage rotary vane vacuum pump

The performance of single-stage rotary vane vacuum pump is poor. Its residual gas partial pressure is 5 x 10-1 Pa, while the total pressure (the sum of residual gas and residual steam partial pressure) is 5 pa. The main reasons are as follows:

1) There is a "harmful space" in the structure of the pump, and the gas in the space can not be excluded. When the rotary vane turns the exhaust valve, this part of the gas is compressed and returns to the suction space through the gap between the rotor and the pump chamber, so there are always some gases exhausted each time. The smaller the "harmful space" is, the higher the limit vacuum that the pump can reach.

2) The pump chamber is divided into exhaust space and suction space by a rotary vane. Gas in exhaust space is compressed to more than O.1 MPa, while gas pressure in intake space is maintained at less than 1 Pa. There is a great pressure difference between the two. Therefore, the high pressure gas will break through to the suction space through various possible ways, so that the limit vacuum of the pump will be reduced.

3) Pump oil is composed of high molecular hydrocarbons. During the working process, because the high temperature of the friction surface in the pump is enough to split the oil molecules, a large number of light fractions (such as ethylene, acetylene and other hydrocarbons) with high vapor pressure are released, which reduces the limit vacuum of the pump.

4) The pump oil will dissolve a large amount of gas and vapor in the process of circulating flow in the pump body. At a certain temperature, the volume of gas in the oil varies with the gas pressure. When the pump oil enters the suction space, due to the reduction of the external gas pressure, the dissolved gas and vapor in the pump oil will be released again, filling the pump chamber, so that the pump will be under the limit vacuum.

In view of the above factors, in order to improve the ultimate vacuum of rotary vane pump, many measures have been taken, such as improving the processing accuracy of pump body, rotor and rotary vane, minimizing assembly clearance and harmful space, selecting metal with high strength, good corrosion resistance and compact as the material of pump body and rotor, and selecting soft metal as rotary vane. Material, so that the rotary vane and pump chamber surface can maintain good contact and so on.

Stainless-Steel-Vacuum-Pump-Selection

Vacuum-pump-in-vacuum-distillation-industry

2BV-stainless-steel-explosion-proof-liquid-ring-vacuum-pump

Reasons for Heating of Water Ring Vacuum Pump

1. The amount of circulating water is too little. There are two uses of circulating water. One is to cool the vacuum pump. The other is that water forms a water ring in the pump chamber when the impeller rotates. The air compresses the air in the water ring when the impeller rotates. 2. The temperature of the gas sucked by the vacuum pump is higher and the vacuum degree of circulating water is lower than 30 degrees. After running continuously for one day, the vacuum pump produces scale in the pump just like the kettle that boils water at home. When the impeller runs difficultly, the increase of friction causes the heat of the vacuum pump.

Exclusion methods:

1. The motor passport is dismantled. Whether the fan wings of the motor are flexible or not, there is no scale. When it is hard to operate, the exhaust pipe of the pump is dismantled and the scale inside is checked with the hand lamp. Scale will make the impeller difficult to operate, burn down the motor, and the spring of the mechanical seal will be easily locked on the shaft because of the scale. After the end surface is worn out, it can not be supplied automatically, resulting in leakage of the mechanical seal. Water burns down the motor.

2. Vacuum pump is a pumping pump, which permits a small amount of liquid. If the material sucked contains a large amount of water, buffer tank should be installed in front of the vacuum pump. If the vacuum pump sucks a large amount of water, it will break the impeller.

3. Vacuum pump sucks high gas temperature, using tap water as circulating water or using condenser to cool the gas. Attention: Vacuum pump must install overload protector to prevent overload burning motor. Connecting pipeline can not be thinned by 70%. Excessive thin pipeline and poor drainage can also cause overcurrent of motor.

ZJ-Series-Roots-Vacuum-Pumps

Diffusion-Pump-Vacuum-Unit

Water-Ring-Vacuum-Negative-Pressure-Station

2SK-Series-Two-stage-Water-Ring-Vacuum-Pump

rotary vane vacuum pump general assembly

For different types of pumps, different maintenance and assembly technicians, the assembly method is also different. Generally speaking, for non-lateral eccentric rotary vane pump and vacuum pump with reduced assembly clearance, the pump body should be put on the platform when assembling, and the fuel tank should be downward; if the fuel tank of some large and medium-sized pumps is not removed or the intake pipe is not disassembled and put on the platform inconveniently (when uneven), the supporting foot of the pump body can be clamped on the vise, and the oil tank of the pump body inverted is padded with wooden blocks as well. 。

The advantage of inverted assembly is that, due to the effect of the weight of the rotor body, the loaded rotor can be naturally tightened to the wall of the pump chamber, i.e. automatically aligned, thus ensuring the cut-off point division.

Of course, not all mechanical pumps need to be inverted, mainly depends on the principle of easy assembly. For example, the side eccentric pump can be inverted, forward or even side-mounted, that is, the outlet hole (the side of the valve oil window) down, and then assemble the rotor.

Whether it is inverted or formal, the assembly steps are basically the same. Taking the lateral eccentric 2X-8 pump as an example, the assembly steps are described as follows.

(1)Assemble the rotary blade: After the rotary blade is loaded with the spring, it is loaded into the rotor slot to try whether the movement is good or not.

(2) Install high rotor: first install large rotor with high vacuum end, tighten the high rotor with rotary blade, insert the low shaft end into the shaft hole of the middle diaphragm and set it straight. Suitable amount of vacuum pump oil should be lubricated in advance in the pump chamber, and vacuum hygiene should be paid attention to carefully. When assembling, attention should be paid to less touching parts with hands; in operation, fibers and dust should be avoided.

85-Kg-Weight-Oil-Free-Piston-Vacuum-Pump

two-stage-piston-type-vacuum-pump-for-aviation-sold-to-Russia

two-stage-oil-rotary-vane-vacuum-pump-for-refrigerator-absorption-chiller

piston vacuum pump common sense

The sliding piece is embedded in the groove and can slide freely. When the rotation occurs, the sliding piece is sucked onto the pump casing by centrifugation. The sliding plate pump is a volumetric pump, and the adjacent two sliding pieces move to the lower side and the pump. The shell and rotor block the smallest volume, the largest at the top, when the rotor rotates clockwise, the process of the adjacent two slides from the bottom to the top is the volume increase process, so the oil absorption (from the fourth quad to the second Quadrant); from the top to the bottom is the volume reduction process, so the pressure oil (from the second to the fourth quadrant).rotary-vane-vacuum-pumps

Double acting: When the motor drives the rotor to rotate, the sliding piece protrudes outward under the double action of the centripetal force and the pressure oil at the bottom of the sliding piece, and the top is closely attached to the inner and outer parts of the stator. The four sliding vanes on the four-section concentric arc form four sealed working oil chambers with the rotor surface surface, the inner and outer surfaces of the stator and the two distribution plates. These oil chambers change from small to large or large to small as the rotor rotates, and can pass through the oil suction window of the distribution plate (connected to the oil suction port) or the oil discharge window (connected to the oil discharge port). Inhale or pressurize the oil.

During each revolution of the rotor, each working oil chamber completes two oil suction and oil pressure, so it is called double-acting piston vacuum pump. Because the upper and lower pressure chambers are symmetric with each other, the shaft is balanced by force and is unloading.

    The piston vacuum pump is equipped with small power and large flow. It is the best choice for gas stations, oil depots, chemical industry, oil refinery, aviation kerosene and steam refueling.piston-vacuum-pump-structure

Single action: the sliding piece is embedded in the groove and can slide freely. When the rotation occurs, the sliding piece is sucked onto the pump casing by centrifugation. The sliding plate pump is a positive displacement pump, and the adjacent two sliding pieces move to the lower side. The volume with the pump casing and the rotor is the smallest, and the largest at the top. When the rotor rotates clockwise, the process of the adjacent two slides from the bottom to the top is the volume increase process, so the oil absorption (from the fourth quadrant) To the second quadrant); from the top to the bottom is the volume reduction process, so pressurize the oil (from the second to the fourth quadrant).

Double acting: When the motor drives the rotor to rotate, the sliding piece protrudes outward under the double action of the centripetal force and the pressure oil at the bottom of the sliding piece, and the top is closely attached to the inner and outer parts of the stator. The four sliding vanes on the four-section concentric arc form four sealed working oil chambers with the rotor surface surface, the inner and outer surfaces of the stator and the two distribution plates. These oil chambers change from small to large or large to small as the rotor rotates, and can pass through the oil suction window of the distribution plate (connected to the oil suction port) or the oil discharge window (connected to the oil discharge port). Inhale or pressurize the oil. During each revolution of the rotor, each working oil chamber completes two oil suction and oil pressure, so it is called double-acting sliding vane pump. Because the upper and lower pressure chambers are symmetric with each other, the shaft is balanced by force and is unloading type. The sliding vane pump is equipped with small power and large flow. It is the best choice for gas stations, oil depots, chemical industry, oil refinery, aviation kerosene and steam refueling.liquid-ring-vacuum-pump-installations

Roots Vacuum Pump Manufacturer

The quality of vacuum equipment on the market is uneven. For Roots vacuum pumps, the quality of products in the formal enterprises must be guaranteed. Whether it is the processing of components or the assembly quality, they are strictly checked and tested layer by layer, and the parts used are basically provided by fixed suppliers. But for some small companies, they only need to be able to produce products. For example All aspects are basically ignored. If a product is to be done well in a long time, the first prerequisite is reliable quality and durability. Only in this way can it develop.rotary-vane-vacuum-pump-not-reaching-reasons-for-vacuum-degree

Sealing is an important key to Roots vacuum pump. If the sealing is not good, the vacuum degree of the vacuum pump may not be reached and the pumping capacity will decrease. Therefore, in the production and assembly, the effect of sealing treatment directly affects the use of the pump. It is necessary to adopt high-quality seals. Many regular enterprises are choosing this way as long as the quality is good. Parts, the pump installed must be reliable, relative to some small companies as long as they can be used, regardless of the quality of the problem, in the assembly process of seals, but also to improve the assembly quality, improve the eligibility rate of one assembly.rotary-vacuum-pump-installation-specification

Roots vacuum pump has high hermeticity, the use value can be reflected, the user can be satisfied with the product, and the reliability of the quality is the basis for the survival and development of the enterprise.

Vacuum Pump Unit Operation

Vacuum pump unit is composed of pump as the main pump and rotary vane pump as the front pump in series. The water ring pump selected by the vacuum pump unit is more advantageous than other vacuum pumps, because it not only overcomes the limit pressure difference of a single water ring pump, but also overcomes the shortcoming of low pumping rate under a certain pressure. Here we introduce the operation of vacuum pump unit, the correct operation can ensure the efficient completion of the workload of the machine.high-performance-rotary-vane-vacuum-pump

1. Check the lubricating oil level of the vacuum pump unit should be within the scale indicated on the oil window and make sure that the lubricating oil is clean.

2. Make sure that there is no liquid accumulation in the vacuum buffer tank before the pump, and that the nitrogen pressure valve, the exhaust valve and the bottom valve are all closed.liquid-ring-vacuum-pump-price

3. Check and confirm that the lubricating oil level in the crankcase of reciprocating vacuum pump is within the calibration range indicated by the oil window, and there is no impurities in the crankcase.

4. Add clean lubricating oil to the oil cup and slightly open their needle valves so that the lubricating oil can be injected into the cylinder drop by drop.vortex-vacuum-pump

After installing the tail gas collecting device, the vacuum pump unit can collect the gas which can not be solidified and compressed in the high vacuum system. At the same time, it can avoid the problem of environmental pollution caused by the discharge of a large amount of wastewater from the water ring unit. Because of the advantages of vacuum pump unit, it is widely used in various fields.piston-vacuum-pump-supplier

How to Reduce Noise of Piston Vacuum Pump

Piston vacuum pump is also a kind of vacuum pump widely used in many vacuum equipments. It has the advantages of large pumping speed, simple structure, reliable performance and high vacuum degree, so it has become a product with large market demand. However, the main problem of the pump is that the noise and vibration are relatively large, which has adverse effects on the environment of the users and will damage the service life of the vacuum system.liquid-ring-vacuum-pump-technology

Therefore, it is of great significance to improve the noise and performance of piston vacuum pump, prolong its working life and efficiency. In order to reduce the impact noise of piston vacuum pump, the commonly used method in China is to reduce the impact by reducing the speed of piston vacuum pump. If the speed of piston vacuum pump is changed from 540 r/min to 480 r/min, the noise can be reduced by more than 3 dBA. However, reducing the speed of the piston vacuum pump means increasing the volume of the pump when the pumping speed of the piston vacuum pump is unchanged. Obviously, this measure is not the best one. Therefore, it is necessary to explore other effective methods to reduce noise. Sound propagates in the pipeline. When the cross-sectional area of the pipeline changes, the acoustic impedance Z also changes. At variable cross-section, due to the change of impedance, a part of the incident acoustic wave will be reflected back to the original pipe, which will attenuate the incident acoustic wave and play a role of silencing. In the exhaust system of piston vacuum pump, the cross section of air flow has changed many times from the exhaust hole of pump chamber to the exhaust pipe of fuel tank. The impact noise of piston vacuum pump can also be effectively reduced if the muffling performance of variable cross-section pipeline is reasonably utilized.

Because of the special structure of the exhaust system of the piston vacuum pump, it can be simplified to two series resistant mufflers. The upper part of the gas shield and the fuel tank are used as two expansion chambers in the design. According to the low frequency dominant frequency in the noise of the piston vacuum pump, the lengths of the two expansion chambers are designed separately, which can effectively reduce its noise. At the junction of the two expansion chambers, the noise of the vacuum pump can be further reduced if the tube is inserted at a quarter wavelength.piston-vacuum-pump-supplier

Rotary Vacuum Pump in Pharmaceutical Technology

Rotary vane vacuum pump has been successfully used in many fields for many years. Today, they are one of the most widely used mechanical vacuum pumps in the industry. Rotary vane vacuum pump, which is specially designed for chemical and pharmaceutical processing technology. This vacuum pump is widely recognized in the field of processing technology by virtue of its excellent performance of ruggedness and durability.

Compared with other vacuum pumps, rotary vane vacuum pumps have three obvious advantages:

The two compression stages are stacked together and connected, which is helpful for initial compression of process gas in the first stage and secondary compression in the second stage, so that lower limit pressure can be achieved.rotary-vacuum-pump-in-refrigeration-system

These vacuum pumps are lubricated by oil, which means that a certain amount of working fluid, oil or other compatible liquid is injected into the compression chamber. In contrast, other rotary vane vacuum pumps use oil cycle lubrication.

Rotary vane vacuum pump uses water cooling, so that it can adjust the working temperature in a specific range.

Rotary vane vacuum pump belongs to rotary positive displacement pump. The blade is placed in the rotor slot, and the rotor rotates eccentrically in the cylindrical shell. Because of the centrifugal force produced by the rotating motion of the rotor, the blade will slide out of the groove and contact with the cylinder wall. This will create space with different capacities, thus generating suction and compression effects. In order to reduce friction and improve sealing, oil is continuously injected into the compression chamber. This process occurs in two compression stages, before which process gas and working fluid are discharged through the outlet and then removed. Water cooling is used in both stages. We offer direct current water cooling and water circulation.rotary-vacuum-pump-in-drug-packaging

Since lubricants flow only once through vacuum pumps, almost all liquids with a viscosity of 150 centimeters (cSt) can be used. These lubricants wash vacuum pumps continuously in order to prevent corrosion and deposition. Leaves made of three different materials are provided to ensure tolerance to most solvents.