Water Ring Vacuum Pump in Chemical Industry

What are the characteristics of using water ring vacuum pump in chemical industry?

The performance and requirements of mechanical products vary with the types and properties of the chemical media being transported.

Although the medium mentioned here sometimes refers to water, oil or other non-hazardous substances, in most cases the chemical medium refers to some very "terrible" chemical raw materials, such as those with serious hazards (toxic, corrosive and flammable), especially those that are prone to chemical reactions. Medium with corrosive or erosive action or solid or gas medium containing the above components.

The change of chemical composition and the ratio of chemical elements in the diversified medium will lead to the change of the properties of the chemical medium, the concentration of the chemical medium will be improved, or the chemical medium will have special activity. Therefore, YCB-G thermal insulation gear oil pump often puts forward stringent quality requirements for the purity of chemical media, and these stringent quality requirements can be easily realized by a suitable water ring vacuum pump.

(1) The diversity of requirements for chemical pumps is derived from the diversity of chemical media. This makes the standard system of chemical pump difficult to become a simple standard system. Compared with other fields, such as household electrical, household heating, water supply, drainage and other fields, as well as chemical refinement or automobile manufacturing, standardization has reached a considerable level not only in the production of products but also in the use of products. In the chemical production enterprises, the standardization of chemical pumps has encountered obstacles in terms of technology and economy.

(2) Where is the possibility of optimization and improvement of vacuum pumps? First, standardization is very helpful and meaningful to the production and use of water ring vacuum pumps. But: from the life cycle of the high and low angle end can carry a large load (that is, resistance is very large), or even blockage.

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Vacuum Pump Development

With the development of vacuum application, many kinds of vacuum pumps have been developed. Their pumping speed has risen from zero to hundreds of thousands and millions of liters per second. According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely, gas trapping pump and gas transmission pump.

With the application of vacuum technology in the field of production and scientific research, the pressure range of vacuum technology is becoming wider and wider. Most of them need several vacuum pumps to form a vacuum pumping system to work together to meet the requirements of production and scientific research. Because the range of working pressure involved by vacuum application department is very wide, so any vacuum application department can not meet the requirements of production and scientific research. One type of vacuum pump can not be fully applicable to all working pressure ranges. It can only use different types of vacuum pumps according to different working pressure ranges and different working requirements. In order to use conveniently and meet the needs of various vacuum process, sometimes all kinds of vacuum pumps are combined according to their performance requirements for unit type application.

Common vacuum pumps include dry screw vacuum pump, water ring pump, reciprocating pump, slide valve pump, rotary vane pump, Roots pump and diffusion pump. These pumps are indispensable main pumps in the application of vacuum technology in various industries of our national economy. In recent years, with the sustained and high-speed development of China's economy, the downstream application industry of vacuum pumps has maintained a rapid growth momentum. At the same time, the vacuum pump industry in China has achieved sustained, stable and rapid development driven by the constant expansion of the application field of vacuum pumps and other factors.

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Start-up steps of water ring vacuum pump

Water ring vacuum pump is used to suck or compress air and other non-corrosive, water-insoluble, solid-free gases. Because the compression process of gas is isothermal in the working process, it is not easy to occur danger when compressing and sucking explosive gases, so it is more widely used. What should we pay attention to when we first use startup? Let's have a brief understanding of the correct way of startup.

1. Open the inlet and outlet valves of the circulating cooling water of the water ring vacuum pump and the main pump to ensure the normal inlet and outlet of the circulating cooling water.

2. Close the drainage valve of the buffer tank of the water pump, start the water pump, and slowly open the intake valve of the water ring vacuum pump after normal operation (noise balance of motor and pump).

3. When the system pressure reaches the allowable inlet pressure set by the intermediate pump, the intermediate pump is started. If the automatic control gear is adopted, the automatic control gear is directly dialed, and the start-up process of the unit is automated.

4. If manually controlled, when the outlet pressure of the intermediate pump reaches the allowable inlet pressure of the main pump, start the water-ring vacuum pump.

5. When the pump reaches the limit vacuum or maximum pressure, open the valve in the intake pipe and the pump starts to work normally.

6. The best way is to adjust the packing cap when the water drops out.

7. Adjust the water supply of the pump through the valve to ensure that the pump operates under the required technical conditions, so as to minimize the power consumption, meet the performance indicators and meet the working requirements.

8. Adjust the water supply to the steam-water separator in order to use the minimum water consumption to ensure the technical specifications required by the pump.

No matter what equipment is used, the correct start-up should be used strictly in accordance with the operating rules, so as to better protect the equipment.

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Water Ring Vacuum Pump Price

Before purchasing a product, we will know its price first. Water ring vacuum pump is the same. What factors affect its price? This article will give you a detailed analysis to help you choose the best and cheaper products.

1. The quality of accessories and raw materials, water ring vacuum pump mainly consists of filter, marbles, exhaust hood and other accessories, the quality of these accessories directly affects its price.

2. The material of the pump body can be divided into nodular cast iron and grey cast iron. Spheroidal graphite is obtained by spheroidizing and inoculation treatment of nodular cast iron, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thus obtaining higher strength than carbon steel. Material quality is also one of the important factors affecting its price.

3. Technical content. It is well known that the degree of technical maturity, the stability, reliability and life of products manufactured by high-standard processing and production equipment have an impact.

4. Regionality, most domestic products are now facing the dilemma of having spare parts without technology and spare parts without technology. Because of the regional problems of raw materials, their prices are uneven.

In fact, there are many factors affecting the price of water ring vacuum pump, but the four points introduced above are the most important factors, hoping to help you in the purchase process.

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oil diffusion pumps of classification

In our country, the diffusion pump has been incorporated into the national standard series production, and has been widely used.

Existing diffusion pumps can be classified into different categories:

1. According to working fluid, it can be divided into oil diffusion pump and mercury diffusion pump.

2. According to the structure material, it can be divided into metal diffusion pump and glass diffusion pump. Metal diffusion pumps can be made very large (pumping speed can be hundreds of thousands of litres per second), glass diffusion pumps can only be made into hundreds of litres per second, but its outstanding advantages can not be ignored.

3. According to the type and structure, it can be divided into vertical type, horizontal type, single-stage and multi-stage.

At present, metal or glass vertical four-stage oil diffusion pump is the most widely used. Mercury diffusion pumps have gradually attracted more and more attention.

The main structural components of diffusion pump are pump body, cooling cap, nozzle, steam flow conduit and heater.

The simple working principle of the diffusion pump is to use the high-speed steam flow to establish the partial pressure difference between the pumped container and the diffusion pump, so that the pumped gas molecule is continuously diffused into the high-speed directional steam flow, then compressed into the front space, and finally pumped out by the front pump.

Diffusion pump must work under a certain pre-vacuum (10-2-10-3 torch). After the diffusion pump reaches pre-vacuum, the working fluid in the pump can be heated to boiling by electric furnace. A large amount of steam generated by the diffusion pump can be distributed to the nozzles at all levels through the diversion tube of the pump core. The steam changes direction at the nozzle cap and forms a directional and dense steam flow with high velocity after it is ejected from the nozzle.

Oil Diffusion Vacuum Pump

Oil Booster Pump

liquid ring vacuum pump of vacuum dewatering

Vacuum dewatering is a commonly used process in paper industry. Vacuum dewatering treatment with liquid ring vacuum pump produced by our company is very complicated. It is a typical case of vacuum dewatering. The specific process of vacuum dewatering is described in detail below.

The general process flow of papermaking is as follows:

Raw materials - slicing - Cooking - washing - Screening - bleaching - beating - vacuum dehydration (using water ring vacuum pump) - pressing dehydration - drying - shaping - out of the factory.

The pulp after beating contains a large amount of water. The water in pulp must be removed before it can be made into finished products. Vacuum dewatering is the first stage of pulp dewatering.

The vacuum dewatering process involves spraying pulp into a copper mesh with fine grids woven from copper wire. There is a vacuum box under the copper mesh belt at a certain distance. Under the vacuum box, a vacuum pipe is put into the vacuum pipe, and then the intake pipe of the water ring pump is connected.

Because of the vacuum caused by the liquid ring vacuum pump, the moisture in the pulp on the copper mesh belt can be sucked into the pipeline to achieve the purpose of dehydration.

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Vacuum Pump System in Electric Vacuum Industry

Because the working principle of various electric vacuum devices is based on electric field and magnetic field to control the movement of electrons in space so as to achieve the purposes of amplification, oscillation and image display. Therefore, the vacuum pump system can prevent the collision between electrons and gas molecules, ensure the movement law of electrons in space, avoid cathodic oxidation poisoning of emitted hot electrons, pump electronic devices into different vacuum required by different electronic vacuum devices, and ensure the normal operation of electronic devices.

At present, the main electrovacuum devices consumed in the electrovacuum industry are various kinds of electronic tubes (rectifier, transmitter, receiver, klystron, traveling wave tube, magnetron, photoelectric tube, etc.); various ion tubes (pump-arc rectifier, ignition tube, counter, thyratron, noise tube, radar wire switch, etc.);（ Oscilloscope, vidicon, kinescope, X-ray tube, image converter, etc.); various electric light source tubes (illumination lamp, spectral lamp, instrument lamp, etc.) and neutron tube, electron diffractometer, electron microscope, X-ray microscope, particle accelerator, mass spectrometer, nuclear radiation spectrometer, gas laser and electron in vacuum application Beam stop degassing, smelting, regional purification, condensation and drilling of refractory metals and media, grooving cutting, evaporation of radioactive isotopes, welding of refractory metals and many other aspects. These electronic devices and processes play an obvious role in modern science and modern industrial consumption.

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Piston Vacuum Pump Advantage

Piston vacuum pump is a very durable machine. The eccentric wheel drives the sliding valve to rotate along the cylinder wall. A large amount of oil pushed ahead of the eccentric wheel forms a large area of sealing surface, which has little effect on mechanical abrasion. In addition to sliding valves, the mechanism can automatically compensate for wear. At the same time, there is inherent imbalance in the trench, and the vibration degree can be properly controlled according to the balance method adopted. The piston vacuum pump is not sealed by oil immersion, and its oil flow is controlled by an automatic control valve in an accessible oil circuit.

The vacuum retention of the pump is not good because the static contact between the slide valve and the cylinder wall is weak. The working noise of the sliding valve vacuum pump without air ballast is slightly higher than that of the rotary vane vacuum pump with the same size (especially the pump immersed in oil). But the working noise of piston vacuum pump is lower when using air-ballast. The recovery time of two-stage pump in rapid circulation is short because of the large amount of oil splash caused by the pumping mechanism inside the pump. However, if necessary improvements are not made, the long-term operation of double-stage sliding valve vacuum pump under high pressure is not ideal.

The most prominent advantage of piston vacuum pump is that it is insensitive to mechanical damage and can be easily repaired by unskilled people. The main disadvantage is the inherent high vibration, especially when the non-equilibrium form is adopted.

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Liquid Ring Vacuum Pump Operating Points

When the liquid ring vacuum pump is running, it is necessary to continuously fill water to maintain the liquid seal in the pump and also to play a cooling role. However, the vacuum caused by the pump is limited by the temperature of the water in the pump body.

The liquid ring vacuum pump can make the extracted gas not contact with the pump shell directly, so only the impeller is made of corrosion-resistant material when the corrosive gas is sucked. The liquid injected into the pump must not react with gas. For example, water can be used to suck air and concentrated sulfuric acid can be used to suck nitrogen. It should also be noted that the liquid used should not contain solid particles. Otherwise, the impeller and shell will be often worn and the suction capacity will be reduced.

Single-stage steam jet pump can only get 90% of the vacuum. If more than 95% of the vacuum is to be obtained, several steam jet pumps can be used in series to obtain greater vacuum.

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Correct use of rotary vane vacuum pump

How to apply the rotary vane vacuum pump correctly is described in detail below.

Before application, the product specification should be read carefully, and the quality of shipment should be checked after opening the case. Receive spare parts and technical documents, remove exhaust protective parts. According to the request device, wiring, trial steering. Water-cooled pumps receive water.

In order to avoid fuel injection due to oil return and reversal, the pump mouth should be opened first, and the oil in pump should be transferred to the tank by hand tray according to the rules. At the same time, check the oil level, should be above the oil mark center, but do not fill the oil mark, more to release.

Auxiliary method to distinguish steering. Put the sheath on the pump mouth, if it is absorbed after opening the pump, it is positive, blown off and reverse. The normal sound is positive, and the abnormal sound is reverse.

If a pneumatic solenoid valve is installed at the pump mouth, it should be installed horizontally and operated simultaneously with the pump.

Gas ballast valves should be used when the relative humidity is high or the condensable vapors such as water vapor in the extracted gas are used.

Vacuum pump oil is recommended according to the specification. Note that ester vacuum pump oil can not be mixed with mineral oil type vacuum pump oil and other oils. It must be cleaned strictly before it is replaced with ester vacuum pump oil.

The limit pressure of the pump shall be checked by a compact mercury vacuum gauge. Full pressure gauge should pay attention to pairing calibration and standby comparison of gauge and regulation. It is advocated to install a ball valve between the regulator and the pump under test. Closing the valve at unexpected time can prolong the operation time of regulation.

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Water Ring Vacuum Pump of Application

In view of the economic development trend of water ring vacuum pump manufacturers in the market, as the production enterprises of vacuum industry, in order to make the vacuum pump products have a broader development space, in the process of utilizing its overall strength, we should also take the performance and practical ability of the products as the development goal and the user's use as the development direction. To promote the development of different types of vacuum pumps, so that they can really bring an important role in the production of various industries, but also to achieve the continuous development of the vacuum industry, among which water ring vacuum pumps, reciprocating pumps, Roots pumps and other products can be widely used and developed. Therefore, it is necessary to enhance the performance advantages of other products such as water ring vacuum pumps, make use of the characteristics of their different equipment, embody the stable operation of the equipment from the overall utilization, further strengthen the upgrading of the product indicators, expand their continuous development capacity, further improve the beneficial application of product infrastructure, and increase the number of products. In order to make the vacuum pump more practical, the enterprises have to strictly control the production process and standardize the production to enhance the quality of the products.

Our water ring vacuum pumps are widely used in petroleum, chemical industry, machinery, mining, light industry, medicine and food industries.

Only by strengthening the productivity can we produce more excellent products and make water ring vacuum pumps and other products develop more widely. The requirement of product performance is also a condition of continuous development.

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Sealing Form of Liquid Ring Vacuum Pump

In order to let you better use the liquid ring vacuum pump, today's edition for you to sort out some information about its sealing form, let's take a look at it together!

1. Packing seal is to put the compressive and resilient packing into the packing box of liquid ring vacuum pump, which can be sealed by transforming the axial compressive force of the cover into the radial sealing force.

2. Oil seal is a self-tightening lip seal. It has simple structure, small size, low cost, convenient maintenance and small resistance torque. It can not only prevent medium leakage, but also prevent external dust and other harmful substances from entering the liquid ring vacuum pump.

3. The labyrinth seal of the liquid ring vacuum pump works well when the design is reasonable, the processing is fine, the assembly is intact and the rotating speed is high.

4. Power seal. When the vacuum pump is in operation, the pressure head produced by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, thus realizing seal.

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Stainless Steel Vacuum Pump Selection Design

The selection and design of different vacuum pumps are different. Let's take stainless steel vacuum pumps as an example to give you a brief introduction of this knowledge.

The working pressure of the selected stainless steel vacuum pump should meet the requirements of the vacuum equipment's limit vacuum and working pressure; each pump has a certain range of working pressure, and the working point of the pump should be selected to work within this range; check and determine the type and amount of pumping required by the process. The details are as follows:

The characteristics of gas are analyzed, such as corrosiveness, cohesion and so on. Because if the type of pumped gas reacts with the liquid in the pump, the pump system will be polluted. At the same time, it must be considered to determine the appropriate exhaust time and the gas footprint generated during the exhaust process.

Stainless steel vacuum pump under its working pressure should be able to remove all the gas produced in the process of vacuum equipment, and determine the vacuum volume of the system. Check to determine the time required to achieve the required vacuum, the flow resistance and leakage of the vacuum pipeline. Considering that the required vacuum degree can be achieved and the required pumping rate can be maintained under certain technological conditions, the proper stage ratio between the main pump and the front pump can be determined by incorporating the stainless steel vacuum pump correctly, and the shorter and thicker pipelines should be adopted as far as possible in the design of the vacuum pipeline, and the general diameter of the pipeline is not less than the inlet of the stainless steel vacuum pump.

In the design of stainless steel vacuum pump system, the sealing property of the system should be improved and the leakage rate of the system should be reduced. The proper sealing material should be selected, and the actual volume of gas pumped by stainless steel vacuum pump is related to the working liquid. The higher the working fluid is, the higher the steam partial pressure is, the worse the condensation effect of the working fluid on the inlet steam of the vacuum pump is, and the smaller the volume flow of the pumping gas of the stainless steel vacuum pump is. It is suggested that the working fluid with lower saturated vapor pressure should be selected. At the same time, it is necessary to control the temperature of working fluid; for extracting the gas with high solidification point, in order to avoid the gas entering the pump body to condensate and deposit, it is necessary to increase the temperature of the pump, such as heating nitrogen to increase the temperature of the pump; new technology should be adopted in the design of stainless steel vacuum pump system to achieve automatic control and interlocking protection.

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How to Improve the Performance of Stainless Steel Vacuum Pump

We introduce how to improve the performance of stainless steel vacuum pump, so that you can use it. Let's have a look together.

In the stainless steel vacuum pump chamber, it is divided into low-pressure chamber area and high-pressure chamber area. If the position of the filling port is in low-pressure area, the external fluid supply can be realized by self-priming of the pump itself, which requires less filling pressure. If the high-pressure cavity is filled with fluid, then the pressure of the cavity must be greater than the pressure of the pump cavity in order to carry out the fluid replenishment. Otherwise, the working fluid can not be replenished in time, which will cause gas to flow back from the compression chamber to the suction chamber, affecting the performance of the stainless steel vacuum pump.

After many tests, it is found that the performance of stainless steel vacuum pump can be reduced by using the self-priming method of the pump, because the pump can supply liquid at the suction chamber or at the end of the impeller, and the working fluid has been working for a period of time (starting from the completion of the compressed gas in the working fluid), that is, the energy is available. A certain loss, coupled with the impact loss of the liquid ring caused by fluid replenishment at this time, also reduces the effective work of the working fluid on the gas, consuming a part of the energy. If the replenishment fluid is placed in the air chamber position, the replenishment fluid can obtain sufficient energy and participate in the next round of suction and exhaust process with little energy loss. Therefore, it is beneficial to improve the performance of stainless steel vacuum pump by replenishing fluid in the high-pressure chamber position.

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How to Avoid Cavitation of Water Ring Vacuum Pump

Cavitation is a common fault in the use of water-ring vacuum pump. It will make the vacuum degree of the vacuum pump not meet the required requirements, thus affecting the normal use of the vacuum pump. Therefore, how to avoid cavitation of water-ring pump has become an important problem faced by many users. The water ring vacuum pump manufacturer has introduced the following contents for us.

During the operation of water ring vacuum pump, the higher the vacuum degree, the lower the boiling point. When the liquid boils, a large number of bubbles will be generated. These tiny bubbles are very fragile, and will have a strong impact on the impeller in the process of breaking. Over time, if the impeller is perforated and damaged seriously, it may be forced to replace because it can not be repaired. Excessive liquid flow will also produce sharp noise, which needs to be reduced.

Solution: In view of this phenomenon, we can design the impeller into copper impeller, stainless steel impeller and other materials. There is a cavitation valve on the front of the water ring pump. When the cavitation sound is too high, opening the cavitation valve a little will reduce the noise, but it is not suitable for the process requiring high vacuum, because vacuum is not suitable. Degree will be greatly reduced.

When cavitation occurs in the use of water ring vacuum pump, we should stop using it immediately and take effective measures to solve it. In addition, in actual use, according to the correct steps, the cavitation problem can be effectively avoided.

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Water Ring Vacuum Unit in Chemical Industry

Water ring vacuum unit, also known as liquid ring vacuum unit, is widely used in petroleum, chemical industry, machinery, mining, light industry, medicine, food, automobile manufacturing and other industries. In the production process, vacuum filtration, vacuum drying, vacuum feeding, vacuum distillation, vacuum concentration, vacuum dehydration, vacuum degassing and other industries, water ring vacuum device is widely used.

The water ring vacuum unit is equipped with a proper amount of water in the pump body as working circulating fluid. When the impeller rotates clockwise, water is thrown back and forth by the impeller. Due to the action of centrifugal force, water forms a closed ring whose thickness is roughly equal according to the shape of the pump chamber. The inner surface of the upper part of the water ring is just tangent to the hub of the impeller, and the inner surface of the lower part of the water ring is in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring). At this time, a crescent-shaped space is formed between the hub of the impeller and the water ring. The impeller divides the water ring into several small cavities with equal number of blades. If the starting point is 0 degrees above the impeller, the volume of the chamber increases from small to large by 180 degrees before the impeller rotates, and is connected with the suction port of the end face. At this time, the gas is absorbed, and at the end of the suction, the chamber is isolated from the suction port; when the impeller continues to rotate, the chamber becomes smaller and compresses the gas; when the chamber is in phase with the exhaust port, the gas is compressed. At the same time, the gas is discharged from the water ring vacuum pump.

With the rapid development of chemical vacuum unit, liquid ring vacuum unit, water ring vacuum unit, pharmaceutical vacuum unit and multi-stage vacuum unit technology, water ring vacuum unit has been highly valued in various industries in obtaining rough vacuum. Because the gas compression in the water-ring vacuum unit is isothermal, it can extract flammable and explosive gases, in addition, it can also extract gas containing dust and water. Therefore, the water-ring vacuum unit is the necessary equipment in industrial production.

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Water Ring Vacuum Pump for Vacuum Transportation

Water ring vacuum pump is a kind of coarse vacuum pump, which is composed of pump body, impeller, suction and exhaust disc, water ring, exhaust port, suction port, auxiliary exhaust valve and so on. The following chapters introduce the characteristics of water ring vacuum pump used in vacuum transportation:

1. The equipment is simple in structure, convenient in manufacture, processing and installation, low in control cost and short in setup time. The main component of the water ring vacuum pump system is the welding structure of profiled steel sheet, which is composed of the components of pipe and tank shape. The relative movement and maintenance operation between the components are comparatively easy. If some control equipment is installed, the automatic operation can be easily completed.

2. High efficiency of delivery, no return transportation of equipment. All other means of transport have the defect of free return, while the transport medium of water-ring vacuum pump is air, which only needs to be discharged into the atmosphere at the terminal. In the process of delivery, the feeding inlet and outlet can be continuously fed to complete the continuous delivery.

3. Labor hygiene conditions are good. When water ring vacuum pump is used, the material runs in the pipe, the pipe is under negative pressure, the dust will not leak out and fly, and the material will not disperse and pollute the environment. In the process of delivery, it can also stop sorting, boring and other intermediate disposal. If the material is delivered under negative pressure, because the moisture is easy to evaporate under negative pressure, even if no other dry wrist is used, the material with higher moisture will get a certain dull effect in the process of delivery. Applying the different weight of the material particles, the material can be sorted by designing the appropriate tap opening.

4. In addition, the water-ring vacuum pump's delivery pipeline is convenient to set up the pipeline network in the clothing field, and the layout is complicated and sensitive. It can make full use of the space in the field and is easy to adapt to the working environment.

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