Water ring vacuum pump used in coal industry

With the increasing attention to coal mine safety, the water-ring vacuum pump used in coal mine will also put forward higher requirements and standards. Efficient, fast and thorough is the main development direction of annular vacuum pump for coal mine. Next we will understand the application of a water ring vacuum pump in the coal industry, hoping to help you.

1. Coal making

In the vacuum filtration process of refined coal, it is generally required to be able to withstand the impact of air flow and water on the air flow water ring vacuum pump, which needs to be equipped with a pre-separator to stabilize the pressure to separate the liquid.

2, dust removal

Large amount of dust and complex components are the main sources of surface pollution in mining area. With large water-ring vacuum pump as the main pump, equipped with separation, dust removal, protection and other devices to achieve dust recovery and utilization in mining areas, but also played a role in purifying the air.

3. Production of antistatic equipment

In the process of producing anti-static and flame-retardant conveyor belts and underground clothes, vacuum slurry immersion process is adopted to make anti-static and flame-retardant agent enter the conveyor belts instead of the original spraying process, which is more safe and reliable.

4. Vacuum pump drying cable

Mine cable in a relatively humid mine for a long time, it is easy to reduce insulation performance. The water-ring vacuum pump is used as the pumping equipment. The cable is connected with low voltage and high current, which generates heat through the cable and dries under the condition of low oxygen concentration. The oxidation phenomenon is effectively prevented and the aging process of the cable is prolonged.

5. Gas extraction

Gas, also known as coal-bed methane, is mainly composed of methane. The underground coal seam gas content is quite rich, if the natural emission into the air will cause serious greenhouse effect, more serious is that there will be explosion danger, every year because of gas explosion to bring serious losses to the family, gas discharge has become an important job in the coal industry. As we all know, water-ring vacuum pump is an equipment for extracting flammable and explosive gases such as gas, because water is used as the medium in the whole pumping and exhausting almost isothermal state. It is worth noting that if the gas extraction should be equipped with explosion-proof motor.vacuum-equipments

Vacuum pump unit performance

Vacuum pump unit is mainly pumped by one type of pump, and other types of pumps in series work together to enhance the role of a single pump body, improve the short plate of some single-stage pumps, making some factories and equipment manufacturers more efficient. However, there are still some factors in the vacuum pump unit that make the performance of the vacuum pump unit fail to be brought into full play.

1, condensation is not enough. The compressed gas temperature of the vacuum pump unit is low, and the exhaust temperature is only 10 ~ 15 degrees higher than the inlet temperature. Because of this characteristic, the vacuum pump unit is suitable for pumping and pressing inflammable and explosive gases. Condensate plays an important role in vacuum pump unit. Condensate can condense steam sufficiently. However, once the cooling water supply is insufficient, the condenser will produce a heating phenomenon, the sound of the air flow becomes larger, the vacuum degree drops rapidly, and even the steam will return to the exhaust pipe. The partial pressure of water vapor in the discharge pressure of vacuum pump unit must be higher than the corresponding full vapor pressure, so the condensate temperature should be lower than the full temperature under this pressure to ensure the normal operation of pump body.

2, seal state. The sealing device of vacuum pump unit is one of the important components to maintain the normal operation of vacuum pump unit. Because of the particularity of dry gas medium, the sealing of vacuum pump unit is required to ensure that the dry gas can neither leak out nor leak inside.

3, environmental factors. The influence of the environment mainly refers to the pollution of the system caused by the exhausted gas. During the disposal of the molten steel, a lot of gas will be discharged. At the same time, some small particles such as oxide powders will be sucked into the vacuum pump unit. These small particles will accumulate and adhere to the pump body, which reduces the flow conductivity of the exhaust pipe and prolongs the exhaust time. The pumping function of the vacuum pump unit has been reduced.roots-vacuum-pump-model

Liquid ring vacuum pump working principle

Water ring vacuum pump is a kind of coarse vacuum pump. The limit vacuum it can obtain is 2000-4000Pa, and the series air ejector can reach 270-670Pa. Water ring pump can also be used as compressor, called water ring compressor, is a low-pressure compressor, its pressure range is 1 ~ 2 *105Pa meter pressure.

Water ring pumps were initially used as self-suction pumps, and then gradually used in petroleum, chemical, machinery, mining, light industry, medicine and food and many other industrial sectors. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pump has been widely used. Due to the rapid development of vacuum application technology, water ring pump has been paid much attention in obtaining coarse vacuum. Because the gas compression in the water ring pump is isothermal, it can extract flammable and explosive gases, in addition, it can also extract dust, water-bearing gases, so the application of water ring pump is increasing.

Rotary Vacuum Pump

Proper amount of water is used as working fluid in the pump body. When the impeller rotates clockwise in the diagram, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring which is approximately equal to the thickness of the pump cavity. The inner surface of the lower part of the water ring is just tangent to the hub of the impeller, and the upper inner surface of the water ring is just in contact with the tip of the blade (in fact, the blade has a certain depth of insertion in the water ring). A one-month conodont space is formed between the hub and the water ring of the impeller, and this space is divided into several small cavities equal to the number of blades. If the lower part of the impeller is taken as the starting point, the volume of the small cavity increases from small to large at 180 degrees before the impeller rotates, and is connected with the suction port on the end face. At this time, the gas is sucked in, and the small cavity is isolated from the suction port at the end of the suction. When connected, the gas is discharged out of the pump.

Molecular pump

Conventional molecular pumps use bearings to ensure high speed rotation of blades. The new type of molecular pump adopts magnetic suspension structure, which makes the blade speed increase continuously, and makes the molecular pump suitable for ultra-high vacuum system, and prolongs the service life of the molecular pump.

Compared with oil seal rotary vane pump and turbine dry pump, molecular pump has cleaner working environment and can achieve extremely high vacuum. However, the molecular pump can not work at atmospheric pressure, must be able to work at atmospheric pressure and other rough vacuum pumps (oil seal rotary vane pump or turbine dry pump) combined use. Molecular pumps are complex in structure and expensive in price. Vibration will occur when rotating at high speed.

Piston Vacuum Pump structure

The structure of the piston vacuum pump  has two types: vertical and horizontal. Vertical structure in the new design of the pump has rarely been used, but it also has its own characteristics: in the operation of the pump forward (backward) impact is relatively small, most of the impact in the upper and lower directions, the operation of the pump produced before and after the sloshing is very small. With this characteristic, vibration damping and vibration isolation can be effectively achieved by configuring suitable shock absorbers or damping pads.

We have done vibration tests on the piston vacuum pump, and the vibration test data fully illustrate this point. In combination with the above situation, it is assumed that the motor and the oil-gas separator are respectively set at the front and back of the pump, designed as a knapsack type to reduce the center of gravity of the pump, and add damping pad at the bottom of the pump, which may become a future development direction of the vertical slide valve pump.

piston vacuum pump has excellent and reliable performance, high efficiency oil-gas separation device, can work continuously under high pressure (low vacuum field), low noise, low vibration, low consumption design, is very conducive to the cleaning of the tank and exhaust valve maintenance, will become an excellent energy-saving product.

Dry vacuum pump

Air cooled roots vacuum pump

Various industries, such as aerospace, large-scale power equipment, petrochemical industry and its air separation, in order to achieve pollution-free vacuum to obtain the environment, the oil-free vacuum pumping system is required to pump more and more speed, such a large rate of pumping only multi-typhoon cold Roots vacuum pump or combined with ordinary Roots vacuum pump pumping system. Unification can be realized.

The air-cooled Roots vacuum pump and its pumping system have the advantages of high speed and small volume of ordinary Roots vacuum pump, and can start at any pressure and run at any pressure difference after equipped with suitable motor and heat exchanger. It is suitable for large load, short pumping time, coarse vacuum to high vacuum. The air-cooled Roots Vacuum Pump and the air-cooled Roots Vacuum Pump Unit composed of the air-cooled Roots Vacuum Pump have great noise during operation, especially the last and second stage air-cooled Roots Vacuum Pump in the combined pumping system, because of the large pressure difference, the exhaust port and both sides of the pump are in operation. When the high pressure gas at the air return port is mixed with the low pressure gas in the elementary volume, it will produce violent pressure pulsation, which will cause enormous air flow impact and strong aerodynamic noise. It will seriously interfere with people's physical and mental health in the ground simulation test and other engineering operations, and restrict this kind of oil-free vacuum pumping unit. On the other hand, it makes many industries feel helpless to choose the vacuum pump (or combination unit).

Existing dry vacuum pumps on the market, such as screw vacuum pumps, claw vacuum pumps and so on, can not be used as the front-stage pumps of combined units because of the limitation of the pump's own structure.

Single stage rotary vane vacuum pump

The single stage rotary vane vacuum pump is also called rotary vane vacuum pump. The rotary vane vacuum pump is a single stage oil sealed rotary vane vacuum pump, which is the basic equipment for obtaining vacuum.

A coarse filter with metal wire mesh is installed at the suction port of the rotary vane vacuum pump. It can prevent solid particles from inhaling pump cavity. The oil separator is equipped with an exhaust transition device with high efficiency for separating oil and gas. When the pump stops, the suction valve built in the suction port isolates the pump from the pumped system and prevents the vacuum pump oil from returning to the pumped system. The pump is cooled by air. All pumps of the rotary vane vacuum pump are driven by a direct coupling motor through an elastic coupling.

single stage rotary vane vacuum pump of Application：

1. Rotary vane vacuum pump is suitable for vacuum pumping in closed system. Such as vacuum packaging, vacuum forming, vacuum suction.

2. Inlet pressure range: 100Pa ~ 100000 Pa. The oil mist will be produced when the outlet of the vacuum pump exceeds this range. The working temperature of the rotary vane vacuum pump and the temperature of the inhalation gas should be between 5 ~40 C.

3, rotary vane vacuum pump can not remove water or other liquids. It is not possible to remove explosive, flammable and corrosive gases.

4. Generally supplied motors are not explosion-proof. If explosion-proof or other special requirements are required, the motors must meet the relevant standards.