Negative pressure roots blower

Now many customers can't tell what is negative pressure roots blower, what is roots vacuum pump, what is vacuum pump and what is roots blower. They also made some mistakes during the acquisition. Now, to sum up the following points, in Roots blower profession, roots vacuum pump is what most people call negative pressure roots blower. Its principle is the same as roots blower. It belongs to volume reversal blower Machine. 

A reverse compressor which uses two blade rotors to make relative motion in the cylinder to compress and transport gas. The roots blower is simple in structure and easy to make. It is suitable for gas transportation and pressurization in low pressure occasions. Conceptually, roots blower is a kind of usage in vacuum pump. Positive pressure blowing is used with large air volume, which can not be completed by vacuum pump, such as water tank aeration, oxygen supply, powder transportation, etc.

There are several kinds of vacuum pumps, such as water ring vacuum pump, rotary vane vacuum pump, steam jet pump, molecular pump, reciprocating vacuum pump, fixed vane vacuum pump, slide valve vacuum pump, residual cycloid vacuum pump, roots vacuum pump, etc. the principle is to use the skewed rotor in the pump cavity to form the gas discharged from the pump after the volume change of rotation, mainly in the suction process.

When the volume of suction cavity increases, the vacuum degree decreases. When the gas in the container is sucked into the pump cavity, the volume becomes smaller and the pressure increases during the exhaust process. After all, the inhaled gas is discharged out of the pump through the oil seal. In terms of parameters, most of the vacuum degree of the vacuum pump is higher than that of the roots vacuum pump, and the suction volume is also larger than that of other roots vacuum pumps, so the negative pressure can be smaller than that of the roots vacuum pump.


Oil Free Vacuum Pump Selection

Rotary Vane Vacuum Pump

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Causes of active trip of vacuum pump

This paper analyzes the causes of the active trip of the vacuum pump. Vacuum pump refers to the equipment or equipment that uses mechanical, physical, chemical or physical-chemical methods to extract air from the container to obtain vacuum. In a word, vacuum pump is a kind of equipment to improve, generate and maintain vacuum in a closed space by various methods. If the vacuum pump encounters an active trip condition. 

First of all, we should understand the cause of the trip condition, and then deal with the vacuum pump trip fault, and then clean up the trip problem. The vacuum pump manufacturer explains the cause of the vacuum pump trip for you. The vacuum pump is stopped for a long time. If the vacuum pump is stopped for a long time, the motor load will lead to temporary high current. At the moment, close the air inlet of the vacuum pump to heat the pump body.

Motor load. The current of vacuum pump motor is too high at the moment. If the current exceeds the current set by the electric control box, the vacuum pump will trip and trip automatically. The vacuum pump wholesale prompts that it is the normal phenomenon of the vacuum pump at the moment. The upper limit of current maintenance can be adjusted to deal with the tripping phenomenon. The vacuum pump can be disassembled to check whether there is any internal fault.

The vacuum pump motor is connected to the two-phase power supply. If the three-phase power supply is not enabled, the three-phase power supply of the vacuum pump can be connected. If the operation time is about 10 hours and the tripping and tripping conditions occur, it is still necessary to adjust the upper limit of over-current. The above materials are supplied and shared by horsepower electromechanical manufacturers.

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Roots Blowers

Roots Vacuum Pump 

Structure of air water separator for vacuum pump

The improvement of the structure of air water separator for vacuum pump. The water containing gas discharged from the vacuum pump directly enters the gas water separator along the tangent direction of the cylinder, which accelerates the wear of the inlet and inner wall of the gas water separator, reduces the service life of the gas water separator and increases the repair strength. 

In order to deal with this problem, the cylinder material of the gas water separator is changed from the original A3 steel to the glass fiber reinforced plastic material with excellent wear resistance and corrosion resistance, and the pipe spacing between the vacuum pump outlet and the air inlet of the gas water separator is extended to 3.9 m, and the pipe diameter is increased to 325 mm, and the wall thickness is 10 mm seamless steel pipe It reduces the indoor noise and improves the working environment. On the other hand, it can play a good buffer effect and reduce the scouring force of the air flow into the cylinder.

Secondly, the tangential inlet of the separator is changed into radial inlet, and a conical baffle is added at the end face of the radial inlet, which can not only reduce the wear of the inner wall of the cylinder caused by the radial inlet, but also play a buffer effect again. After all, the return water pipe at the bottom of the air separator is connected to the concrete trench, so that the backwater enters the circulating water system and is reused.

Vacuum Pump In Grain Industry Application

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Low vacuum pumping unit

The main characteristics of low vacuum unit are high working pressure and large displacement, but its pumping speed is lower than that of high vacuum unit. It is mainly used for the rough pumping of vacuum chamber, vacuum transportation, vacuum impregnation, vacuum filtration, vacuum drying, vacuum degassing (liquid steel treatment) and other equipment with large amount of outgassing and high working pressure. 

The main pumps of low vacuum pumping unit are reciprocating vacuum pump, oil sealed mechanical pump, dry mechanical pump, water jet pump, steam eruption pump, water ring pump, molecular sieve adsorption pump, wet roots pump and other direct discharge atmospheric vacuum pumps. The use of low vacuum pumping unit also needs to be equipped with necessary dust remover and water gas separator according to the cleaning degree, humidity or other special requirements of the extracted gas Oil water separator, dry bath well and other parts.

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Waste heat recovery of air compressor

Air compressor in the process of work produces very large heat energy, but let it white out to the air is a very pity, so there is what we call air compressor waste heat recovery. The waste heat recovery of air compressor is to transfer the heat of high temperature oil of air compressor to cold water through superheat exchange technology. The cold water is heated and flows into the heat preservation water tank, so as to achieve the purpose of heat recovery. 

Because 73% of the heat energy of the air compressor is in the oil, and the technical treatment and heat exchange of the oil will produce a continuous stream of hot water, that is, the air compressor can work under constant temperature, and can meet the needs of the factory or life of hot water, kill two birds with one stone, and the hot water generated by the waste heat recovery technology of air compressor does not need any additional cost, which reduces the cost Less investment by factories to make hot water. Air compressor waste heat recovery is a very environmental protection and energy saving way.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

2BV water ring vacuum pump pressure

For 2BV water ring vacuum pump knowledge, I believe you have a certain understanding, to have a better use of it, you need to know about its pressure knowledge, the following is about its pressure knowledge. 

1. Limit absolute pressure: the absolute pressure is how much higher the measured internal pressure is than the "theoretical vacuum (theoretical vacuum pressure value is 0Pa)". It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by 2BV water ring vacuum pump is higher than the theoretical vacuum value. So when expressed in absolute vacuum, there is no negative sign in front of the value.

2. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. Because the air inside the container is pumped, the pressure inside the 2BV water ring vacuum pump is always lower than the external pressure of the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure.

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Roots Vacuum Pump 

Maintenance of 2XZ rotary vane vacuum pump

The maintenance of 2XZ rotary vane vacuum pump is the key to maintain the safe and long-term operation of 2XZ rotary vane vacuum pump 

1. Keep the 2XZ rotary vane vacuum pump clean to prevent foreign matters from entering the pump;

2. Keep the oil level and do not run without oil;

3. Pay attention to observe the cleanness of the oil. If the pump oil becomes dirty, turbid, enters water or other volatile substances and affects the limit vacuum, the pump oil should be replaced in time. To replace the new oil, first start the pump and run for 30 minutes to make the pump oil thinner. Stop the pump and drain the oil from the oil drain hole. Then, open the air inlet to run for 1-2 minutes. During this time, a small amount of clean pump oil can be added from the air inlet to replace the oil in the pump cavity. After confirming that the pump has been cleaned several times, install the oil drain plug, and then inject clean pump oil from the oil filling hole to the oil level line;

4. When it is not used for a long time, it should be covered with suction and exhaust caps and placed in a dry place, and attention should be paid to moisture and rust prevention;

5. If it needs to be disassembled and overhauled, it must be carried out by professionals who have certain experience in repairing the pump, or contact the manufacturer.

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High precision roots vacuum pump

 It is one of the effective anti-corrosion measures to apply organic coating on the surface of composite materials. Surface adhesive coating protection can be widely used in the repair and pre protection coating of abrasion and cavitation corrosion parts. It has good chemical resistance, excellent mechanical properties and adhesive properties. Compared with the traditional welding repair of pressure vessel, it has the characteristics of simple construction, low cost, safety performance and good repair effect. Repair step surface treatment thoroughly surface oxide layer, clean the surface with 

Noise, ultra-low vibration, can work under high temperature conditions (about 100 degrees), without cooling and other characteristics, which have been verified and recognized by the majority of users. Because of its unique product shape, excellent manufacturing technology, customer-oriented service concept has been recognized by customers. The working principle and performance characteristics of roots pump are essentially the same as cam pump, but the rotor is roots type. It can transport liquids with viscosity of tens of thousands of centipoises. Roots pump is mainly has two opposite rotation direction

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Roots Blowers

Roots Vacuum Pump 

Market competitiveness of water ring vacuum pump

In the development process of continuously developing the practical performance of its products, competitiveness has become a driving force for the overall quality development of the equipment. On the basis of enhancing the application ability of various aspects of its advantages, the overall application strength of the product has been accelerated. 

In order to improve the performance of water ring vacuum pump application performance, in order to achieve the advantages of the development of its products in all aspects, fully reflect its practical performance in all aspects, and constantly drive its overall excellence with practical product strength The improvement of potential ability can reflect the application performance of the equipment in the actual effect of various aspects of application, so as to give full play to the practical effect of the product under the overall application ability according to the drive of quality strength.

Market competitiveness is also a kind of promotion for the development of water ring vacuum pump. In the practical process of vigorously developing its overall application, it is necessary to increase the performance of the overall value of the product with a reliable advantage level, and further develop the overall development of its practical advantages combined with the play of its comprehensive performance, so as to reflect the performance of the overall performance of the product with the strength of all aspects.

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Influence of cooling system temperature on the performance of vacuum pump unit

 In summer, the temperature of closed water can reach 35 ℃. Therefore, it is difficult to guarantee the supercooling degree of 4.2 ℃ in the actual operation of vacuum pump. As the sealing water temperature approaches to saturation, its pumping capacity also decreases, until saturated vaporization and loss of working capacity. 

The working pressure of the vacuum pump and the pressure of the condenser is a dynamic balance process. No matter how high or low the circulating water temperature is, the suction pressure of the vacuum pump must be lower than that of the condenser in order to pump the non condensable gas from the condenser. Therefore, the sealing water temperature of vacuum pump must be lower than the saturation temperature corresponding to the exhaust pressure.

For example, the vacuum of No.3 unit of a company was reduced because the water in the gas water separator was not changed in time, which led to the vaporization of sealing water in the vacuum pump. A few days later, the test was carried out on vacuum pump a of No.2 unit. After adding 16 ℃ cold water into pump a, the temperature of separator was 16.2 ℃. After starting pump a, the temperature rose to 24.5 ℃. With the increase of temperature, the vacuum decreased. When the water temperature was 30 ℃, the vacuum increased about 1kPa and the current of vacuum pump increased about 0.85a. When the working water temperature drops by 1 ℃, the vacuum increases by about 0.19kpa. It can be seen from the test that it is an important means to ensure the vacuum of the vacuum unit to ensure the lower temperature of the sealing water of the vacuum pump in summer.

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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.


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Roots Blowers

Roots Vacuum Pump 

Exhaust pressure of Roots vacuum pump

When roots vacuum pump is working, air will be continuously discharged from the pump body to form the required vacuum degree at the suction port, that is to say, the exhaust pressure is another main factor affecting the operating efficiency of water ring roots vacuum pump.

The exhaust pressure has a great influence on the suction capacity and shaft power consumption of Roots vacuum pump. When roots vacuum pump system is running, if the exhaust pressure is higher, the suction capacity of Roots vacuum pump will be smaller, and the power consumption of corresponding shaft will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of Roots vacuum pump will be greater, and the power consumption of corresponding shaft will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data of Roots vacuum pump system should be observed in real time. When the abnormal exhaust pressure data appears, corresponding measures should be taken immediately to update the whole vacuum system, so as to maintain the exhaust pressure of the vacuum system within the standard range for a long time, and ensure that roots vacuum pump is always in excellent working conditions, and effectively improve the performance of the system High mechanical efficiency of Roots vacuum pump.

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Scroll vacuum pump

The structural characteristics and many advantages of the vortex vacuum pump have been widely known by us, so it has been applied in many industries, and has been generally praised. The application range of vortex vacuum pump is very wide. 

The function of mechanical equipment is there, but different people may find it different. The same is true for the scroll vacuum pump. You can use it as the front stage pump to create a more ideal vacuum environment by cooperating with the main pump. In this way, a good oil-free vacuum system can be obtained. It can also be used separately according to its characteristics and theoretical application place.

The work content of rotary vane vacuum pump and slide valve vacuum pump can be completed by scroll vacuum pump. Some manufacturers can not meet the standard you need. You can also buy scroll vacuum pump to maintain the pressure of the front stage of a vacuum pump lower than the critical pressure. Of course, assuming that the rotary vane vacuum pump and slide valve vacuum pump of the manufacturer are good, don't you have more choices.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Plane type and cone type water ring vacuum pump

At present, the world's water ring vacuum pump is divided into two categories: plane type and cone type, and the plane type technology takes the water ring vacuum pump designed by Siemens of Germany as the leader. 

Based on Siemens technology, the company is specialized in the development of planar water ring vacuum pump. The conical pump, represented by Nessler in the United States, has been recognized in many industries. It has started to develop a new type of conical water ring vacuum pump, which can better meet the needs of customers.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Screw vacuum pump shaft holding problem

Analysis of screw vacuum pump is easy to present another situation, about the presentation of shaft holding problem, perhaps it is the first time to hear this word, do not understand the meaning of the beginning, is not the vacuum pump is not running? There are many reasons for this phenomenon, the following will be a systematic analysis of the reasons for this situation, which may be helpful for future use. 

The problem of screw vacuum pump shaft holding mainly starts from bearing components. The reasons are as follows: the quality of bearing itself is different, or the wear and aging formed in long-term operation; and then, in the assembly process, the bearing positioning and design requirements are very different, positioning is not accurate, the selection of components is unreasonable, and the quality of smooth oil is also related to the occurrence of this situation If the overall vibration of the pump is too large, it is also the cause of the attack.

The reasons described above are the problems of screw vacuum pump shaft locking phenomenon. The application unit can judge which component is formed according to these conditions, so as to make up for it in a short time.

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Vacuum and vacuum heat treatment

The so-called vacuum is a gaseous space with a pressure lower than 101.3kPa (1 atmospheric pressure). The concavity and convexity of the vacuum degree is indicated by the pressure size of the gas space, that is, the higher the vacuum degree, the lower the pressure. 

In operation, the vacuum degree of electric furnace is often divided into three levels: low vacuum, pressure is 1.33x103-13.3pa; medium vacuum, pressure is 13.3-1.33x10-2pa; high vacuum, pressure is 1.33x10-2-1.33x10-4pa. Now, most vacuum heat treatment furnaces use vacuum degree of 133-1.33x10-3pa

The so-called vacuum heat treatment means that all or part of the heat treatment process is carried out in vacuum. In practice, vacuum is regarded as a kind of protective gas with high purity, which can effectively avoid the reaction of oxidation and decarburization at high temperature, improve the surface quality of heat treatment or improve the effect of chemical heat treatment.

Now, vacuum heat treatment has been used in quenching, annealing, tempering, carburizing, nitriding, metallizing and other surface hardening, surface alloying and other processes. In terms of quenching, gas quenching, oil quenching, nitrate quenching and water quenching have been completed.

The primary equipment to obtain vacuum is the vacuum pump. Vacuum pumps commonly used in vacuum heat treatment furnace include rotary vane mechanical vacuum pump, slide valve mechanical vacuum pump, mechanical booster pump, oil booster pump and oil dispersion pump. The first three kinds of pumps are mechanical vacuum pumps, and the latter two are oil vapor vacuum pumps.

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Reciprocating pump in chemical plant

Vacuum pump is used to pump air from the equipment or production system to make the equipment or production system work under vacuum. The main function parameters of vacuum pump are: pumping rate, limit vacuum degree, shaft power and speed, etc. The pumping rate of vacuum pump refers to the volume of gas that can be pumped out in unit time (m3 / h). The limit vacuum degree refers to the vacuum degree that the pump can reach. 

The vacuum pumps commonly used in chemical production are: reciprocating vacuum pump, water ring vacuum pump and eruption pump.

Vacuum pump is characterized by a large pressure ratio. For example, in order to reach 95% vacuum, the nominal pressure of suction is 0.005MPa, while the exhaust pressure is 0.1MPa, and the pressure ratio is 20. Because of the large pressure ratio, the gas in the residual clearance volume will occupy a large volume after expansion, which greatly reduces the suction volume and the useful utilization rate of the cylinder is very low.

In order to deal with the above problems, several grooves are generally opened on the cylinder wall at both ends of the cylinder, which are longer than the thickness of the piston. When the piston works to the dead center position, it is used to balance the pressure of the cylinders on both sides of the piston. For example, when the piston works to the left dead center, the exhaust of the left cylinder is finished, and the residual gas with high pressure in the clearance volume is left, and the suction in the right cylinder is finished, and the pressure is low. Because of the connection effect of the groove, the gas pressure in the clearance volume of the left cylinder decreases. In this way, when the piston returns to work, the volume occupied by the expansion of residual gas is greatly reduced, and the suction volume is increased. The same is true of the piston working to the right dead center.

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Roots Blowers

Roots Vacuum Pump

Unreasonable factors of process medium injection point of vacuum pump

In front of the first flange of the vacuum pump, the temperature of the gas inhaled is 238 ℃. The distance between the first flange and the rotor of the machine is not more than 400mm, and the gas flow rate is very fast and the time is very short. To reduce the process gas from 238 ℃ to 4.8 ℃, to meet the requirements of vacuum pump inlet temperature, the process design is to add a 1-inch pipe nozzle to the pump inlet flange, and inject ethylbenzene to achieve the cooling purpose. 

The injection amount of ethylbenzene is regulated by the control valve on the pipeline. There are two problems: one is the unreasonable design of the injection point, which results in short cooling time and difficult to guarantee the suction temperature of the pump; the other is that once the control valve fails, the working temperature of the equipment will rise comprehensively, resulting in the pump failure.

In addition, before the vacuum pump is damaged, the contact wear between the rotor and the rotor and between the rotor and the shell has experienced a long time. During this period, abnormal temperature, abnormal sound and increased vibration occur. If the inspection personnel pay attention to it, the accident can also be avoided.

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Reducing noise of slide valve vacuum pump

The noise of slide valve vacuum pump is mainly produced by impact. Whether it is the impact of pump oil or mechanical impact, the noise generated is related to the pump speed. With the development trend of pump speed to high speed, this problem is more prominent. 

Compared with steel tank, the noise of cast iron tank can be reduced by (2 ~ 3) dB (a). The main reason is that the structure of cast iron is a little looser than that of steel plate, so it has a certain sound absorption effect. Moreover, the cast iron oil tank is thicker than the steel tank, and the sound insulation effect is better. If a layer of film is sprayed on the inner wall of the oil tank, the effect will be better. The structural shape of the inner surface of the oil tank should be designed to be asymmetric to avoid resonance sound.

The exhaust valve cover is connected with the oil-gas separator, which has the function of sound insulation and noise elimination. If the exhaust valve cover is removed, the pump noise will be much higher. If the oil-gas separator is properly designed, it will also have a certain noise reduction effect. For example, the "secondary cyclone oil-gas separator" designed by us has two collisions through the oil-gas separator in the transmission process, resulting in a certain loss of sound energy, which is conducive to noise elimination.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

vacuum system in vacuum transportation industry application

Vacuum transportation, absorption and lifting equipment are all applied to work by the force generated by the pressure difference between vacuum and atmosphere. Due to the fact that the pressure of this kind of mechanical energy is equal everywhere, it can be applied to any shape plane absolutely. 

At present, most of these vacuum equipment are used for sucking fish, grain, flour, coal powder, tobacco, cement, mud, pulp, powdery mineral powder chemical products, cement floor, prefabricated board, airport and highway cement running, workshop lifting, machine tool fixture, glass loading, milk sucking and dust suction. In the consumption operations, such as sputum suction, pleural effusion, pus, intestinal absorption and radiation dust produced by atomic bomb explosion. These equipments have the characteristics of simple structure, easy operation and maintenance, no vibration during transportation, lifting and absorption, high consumption efficiency, safe and reliable transportation of easily damaged objects, and no pollution to the environment. Therefore, it has a wide range of applications and prospects.

Vacuum profile is also an important aspect of the application of differential pressure. In recent years, it has been widely used in plane military maps, books for the blind, digital models, advanced ceramics, concrete preforms, refrigerator and washing machine panels, toys, replica relief and cultural relics, the formation of micro rotating pillars in TWT and BWT, analysis chamber in mass spectrometer and waveguide manufacturing of microwave system This technology.

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