Application and development of water ring vacuum pump

In the development of water ring vacuum pump value strength play, expand its practical application and quality ability of the drive, constantly improve the overall use of products and quality strength of the drive, reflecting the improvement of the overall use of strength, so as to expand the actual use of the strength of the performance, from all aspects of practical performance, increase the promotion of the role of the overall advantage of the product, the use of product performance belt Dynamic, with reliable practical advantages to enhance the strength of its products, so as to speed up the embodiment of its actual application effect. 

To speed up the overall strength of the application performance development of water ring vacuum pump, promote the embodiment of its product application and other practical value, and strengthen the improvement of product application and performance practical effect, Schindler vacuum pump in order to reflect the practical effect of the product performance of water ring vacuum pump, it is necessary to expand the embodiment of its product performance with the overall driven quality strength, so as to make it the basis of strength performance in all aspects On this basis, enhance the quality and effect of products, expand the overall development of all aspects of the use of strength.

From all aspects of the use of the effect of the product reflects the use of the basis, so that in a reliable level of overall application, expand its product strength, further expand the use of performance, to expand the use of all aspects of its strength, enhance the overall improvement of product performance strength, expand its quality performance.

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Roots Vacuum Pump 

Reciprocating vacuum pump

The working principle of reciprocating vacuum pump is similar to that of reciprocating pump. During operation, through the action of crankshaft and connecting rod, the piston in the cylinder moves back and forth to achieve the purpose of suction and exhaust. Domestic reciprocating vacuum pump has V-type series. It is composed of body, cylinder, piston, crosshead, crankshaft, connecting rod and valve. When the piston moves back and forth, one end of the piston sucks gas from the vacuum system, while the other end exhausts the gas that has been sucked into the cylinder. 

Reciprocating vacuum pump can be directly used to obtain rough vacuum, and its limit pressure is generally about 10 mmHg (1333 PA). The advantage of using this kind of pump is that it has a larger pumping speed under the condition that the vacuum degree is not high in general food vacuum concentration and vacuum drying.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump 

The reason of vacuum failure of water ring vacuum pump

As one of the common equipment of dehydration parts in paper mill, water ring vacuum pump can be used for suction water tank and vacuum roller to draw water in the paper. The working principle is: before starting the water ring pump, water ring is formed at the rim by rotating the cylindrical impeller after the start-up. Because the cavity shell of the pump body is oval, the water ring rotating with the impeller wheel will be pushed in and out in the impeller chamber, resulting in vacuum and pressure transmission. 

After two or three years of use, the vacuum suction capacity of water ring vacuum pump will be decreased. There are also some problems in the vacuum suction capacity of many 2BV water ring vacuum pumps used in a paper mill. Later, the whole vacuum pump was disassembled and inspected, and the reason for its failure was finally found.

1. many cavitation pits of different sizes and shapes are formed on the blades of impeller, which are more serious in the rim part, and the largest cavitation pit can reach 60 × 15 × 30mm3.

2. the tolerance of the matching between the elliptical cavity shell and impeller of the pump body becomes larger.

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The value of Roots vacuum pump

When it comes to the changing market economy, under the promotion of the general environment, the development needs of all aspects have undergone substantial changes. More and more enterprises pay attention to and develop their own products. From the perspective of product development to product application, they want to open up a new road. Taking roots vacuum pump as a typical example, the products are made into series, fine and environmental protection conceptual products, which not only accelerates its development, but also promotes the application of market economy. 

The roots vacuum pump has been developing rapidly with the common advantages. With the advanced technology as the center, the company has increased the deployment of the enterprise's strategy. In addition to enhancing the strength of the product itself, the accuracy of the products has also been increased in the consumption link, and each machined part is used as an important consumption mode, and the quality of the processing parts is improved. The way to invest in the market, provide users with reliable and stable products, and increase the development process of enterprises.

In order to increase the market share of Roots vacuum pump, all enterprises want to make their products into influential products. In the vacuum field, through the central strength of technology, while speeding up the development, corresponding to different needs, do a good job in the development of special performance of products, increase the deployment of market research, and promote the favorable development of products from the overall environment.


CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

single acting reciprocating vacuum pump principle

Vacuum pump is a kind of widely used vacuum equipment, which can be divided into reciprocating, reverse type and so on. This paper focuses on the principle of reciprocating vacuum pump. 

The working principle diagram of single acting reciprocating vacuum pump: its working process is: when the piston moves to the right, the space volume on the left side of the piston in the cylinder increases, and the gas pressure drops. When the pressure drops to a little less than the pressure in the suction inlet pipe, the gas from the suction inlet opens the inlet valve and enters the cylinder. With the piston moving to the right, the gas continues to enter the cylinder until the piston moves to the end of the right, which is the suction process. In the suction process, because the gas pressure outside the exhaust valve is greater than the pressure in the cylinder, the exhaust valve can not be opened. When the piston begins to move to the left, the intake valve is closed by the hair in the cylinder, so that the gas can not flow back to the suction line. When the piston moves to a certain position, the gas in the cylinder is compressed to a pressure slightly higher than the outlet pressure, the exhaust valve is pushed open, and the gas in the cylinder is discharged until the piston moves to the end of the left side, which is the exhaust process. In this way, the reciprocating motion of the piston can form a vacuum at the suction pipe.

Reciprocating vacuum pump also has a single-stage and multi-stage difference. The vacuum degree of single-stage double acting high-speed vacuum pump can reach 10-20 mmHg (certain pressure). The multi-stage vacuum pump can reach higher vacuum degree.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Causes of scale formation in vacuum pump

In the papermaking profession, the working medium of vacuum pump (i.e. make-up fluid) is to directly quote tap water or papermaking white water. Because the hardness of tap water is relatively high, the metal ion composition in white water is also relatively disordered. Therefore, the internal fluid components of vacuum pump work in this medium condition, through a long time of physical and chemical process, will form scale. 

After scaling, the pumping rate of vacuum pump will decrease. Figure 1 is the working condition diagram of vacuum pump internal flow passage parts after scaling. Because there is scale between the impeller blades and on the inlet and outlet windows, the volume of the sealing chamber is significantly reduced, and the volume of the inlet and outlet body is naturally reduced. When the scale almost fills the space between the blades or the air intake and exhaust windows are almost full of scale, the intake and exhaust volume is almost zero, and the vacuum pump loses the effect of vacuum pumping.

After scaling, the vacuum pump not only decreases the pumping rate, but also increases the power consumption. Because of the formation of scale, the exhaust window is reduced, and the contraction ratio of the gas in the chamber increases when the window is discharged, and then the power consumption increases, and the power consumption travels about 10%.

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reciprocating vacuum pump principle application

 

Reciprocating vacuum pump is the use of piston back and forth movement, the energy is transmitted to the liquid. To end the mission of liquid delivery. The flow rate of reciprocating pump is only related to the displacement of piston and the condition of pipeline, but the lift of reciprocating pump is only related to the condition of pipeline.

The reciprocating pump used in practical production has different structural methods because of different liquid properties or different application targets. When used to transport flammable and explosive liquids, the reciprocating pump driven by steam is often used for safety.

In order to prevent piston from being damaged, a barrier pump is used to separate the piston from the main body by using an elastic film. This elastic film is made of rubbers or special metals with good abrasion resistance and corrosion resistance. All parts on the right side of the barrier are made of or lined with anti-corrosion materials; the left side of the barrier is filled with water or oil. When the piston moves back and forth, the gap is forced to turn to both sides alternately, resulting in the corrosive liquid or suspension being sucked and pressed out in turn on the right side of the barrier. Not with the piston. This kind of pump requires huge skill. It is easy to damage and difficult to repair.

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Structure of gas 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.

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The function of gas ballast valve in rotary vane vacuum pump

The gas ballast valve is set in rotary vane vacuum pump to remove condensable gas. Usually, the pumped gas is a mixture of permanent gas and condensable gas. In the process of compression and exhaust, when the partial pressure of condensable gas exceeds the saturated vapor pressure corresponding to the pump temperature, the condensable gas will condense and mix in the pump oil, circulate with the pump oil, and evaporate again into steam when returning to the high vacuum side. This will affect the pumping performance of the pump and aggravate the pollution degree of the pump oil. The method of gas stabilization or aeration can effectively prevent the condensation of condensable gas, that is, the controlled permanent gas (usually dry air at room temperature) is mixed into the compressed gas through the gas ballast hole in the compression process, so that the partial pressure of the condensable gas does not reach the saturated vapor pressure corresponding to the pump temperature, the pressure of the compressed gas has reached the exhaust pressure, the exhaust valve is opened, and the condensable gas The body is discharged with the permanent gas. Oil sealed mechanical vacuum pump is generally equipped with air ballast device, so it is also called air ballast pump. The air ballast valve (aerator) consists of throttle valve and check valve. 

The throttle valve controls the volume of air mixing, and the check valve prevents backflow when the gas pressure in the pump chamber is higher than the aerated pressure. There are generally two kinds of setting of air ballast hole: one is near the pump exhaust port, when the compression chamber and the exhaust port are connected, start to aerate; the other is set on the end cover, when the end of suction, when the rotor turns another angle (100 ~ 150), it will expose the air ballast hole and start to aerate. In the process of aeration, the limit pressure of the pump will rise and the pumping rate will decrease. When the pressure is low, the noise caused by the pump oil impacting the exhaust valve can be reduced by properly opening the air ballast valve and mixing a small amount of gas.

The pump can be pumped out at high speed (90 ℃). In order to prevent oil injection and oil return, improve the lubrication conditions of the pump and expand the application range of the pump, the vane pump is also equipped with various accessories, such as oil mist catcher, molecular filter, dust filter, chemical filter, oil filter, etc. With the progress of technology and the improvement of process requirements, the structure of vane pump is becoming more perfect and its performance is constantly improved.


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Application and applicable temperature of high temperature pump

The flow passage parts of high temperature pump are made of stainless steel (304, 316L), which are widely used in petroleum, chemical, pharmaceutical, electroplating, environmental protection, water treatment, national defense and other departments. It is an ideal equipment for conveying flammable, explosive, toxic and precious liquids, and the best choice for creating a leak-free and pollution-free culture workshop. 

The normal applicable temperature of the high-temperature pump is less than 100 degrees. If high-temperature medium needs to be transported, it can be customized as high-temperature type, and the applicable temperature can be within 200 degrees. It can also be customized with insulation jacket to keep the high-temperature medium transported.

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2be water ring vacuum pump in environmental sanitation industry

With the development of the city, environmental sanitation has become a major problem, and the removal of fecal water is our research and development direction of environmental sanitation equipment. 

Other vacuum pumps were used in the original sanitation truck. Due to design problems and insufficient vacuum, it is difficult for the truck to fully absorb in a short time, and it is easy to be damaged and has a short service life

2be water ring vacuum pump special-purpose unit is not only high in vacuum, but also stable in service life. The septic trucks produced by many special vehicle factories have been used for many years. They not only serve China, but also export to Southeast Asian countries. We will provide more advanced, more efficient and energy-saving equipment for the sanitation industry, and make due contributions to the environment of urban development.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump

Maintenance of oil free vacuum pump

Oil free vacuum pump is a kind of mechanical vacuum pump which can work without any oil for smooth operation. The utility model has the advantages of simple structure, convenient operation and maintenance, and no environmental pollution. Oil free vacuum pump is a durable vacuum pump. It is a vacuum pump for vacuumizing, tightening and dual-purpose. It is the basic equipment to obtain vacuum and has a wide range of applications. Compared with the oil pump, the oil-free vacuum pump has the advantages of low vacuum degree, small volume, convenient installation, simple maintenance, easy to move, no oil fume and no environmental pollution. 

This is one of the most common devices in the laboratory. Therefore, when purchasing an oil-free vacuum pump, it is necessary to confirm the work request of vacuum degree. If the vacuum degree is high and the vacuum degree is higher than the requested vacuum degree, or the vacuum degree cannot be satisfied, the work request cannot be satisfied. The second is the pumping speed of oil-free vacuum pump, which will be slightly higher than the requested pumping speed in order to better meet the demand.

Finally, to see whether the gas can be corrosive and whether the corrosive gas can corrode the pump, special data must be used to meet the demand. The working principle of edit pump is the same as ordinary positive displacement pump. It is composed of stator, rotor, rotor, cylinder, motor and other main components. When the rotor rotates at high speed, the four radial sliding rotors in the rotor slot divide the pump chamber into four chambers.

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Installation of water ring vacuum pump

The premise of vacuum pump operation is correct installation. If it is not properly installed, there will be many faults that can not run. How should each part of water ring vacuum pump be installed? 

1、 Install the pump body and mechanical seal

The static ring part of the mechanical seal is installed on the pump body. When the static ring part of the mechanical seal is installed, it can be wetted with water and then evenly pressed into the pump body by hand. Pay attention not to use too much force! After assembly, check whether the static ring part of mechanical seal and pump body are assembled tightly. 

Press the pump body tightly on the motor and tighten the bolts. Pay attention not to damage the static ring part of mechanical seal. Install the washer into the motor rear cover, and then install the pump body, motor front cover, bearing, motor rotor and inner bearing cover into the motor housing, and lock the bolts. Install the motor fan, retaining ring, motor shield and screw in turn. After installation, the fan shield end of the motor of the pump shall face down and be vertical to the ground, and other parts of the pump shall be ready to be installed.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Working principle of centrifugal pump

The working principle of centrifugal pump is: relying on the high-speed rotating impeller, the liquid obtains energy under the action of inertial centrifugal force to improve the pressure. Before the pump works, the pump body and water inlet pipe must be full of water to prevent cavitation. When the impeller rotates rapidly, the blade impels the water to rotate quickly. The rotating water flies away from the impeller under the action of centrifugal force. After the water in the pump is thrown out, the central part of the impeller forms a vacuum area. Under the action of atmospheric pressure (or water pressure), the water from the water source is pressed into the water inlet pipe through the pipe network. In this way, continuous pumping can be realized. 

It is worth mentioning here: before starting the centrifugal pump, the pump shell must be filled with water before starting, otherwise the pump body will be heated, vibrated, the water output will be reduced, and the pump will be damaged (referred to as "cavitation") and cause equipment accident! The so-called cavitation refers to: when the centrifugal pump starts, if there is air in the pump, because the density of the air is very low, the centrifugal force generated after rotation is very small, so the low pressure formed in the center of the impeller is not enough to suck the liquid level lower than the inlet of the pump into the pump and can not transport the fluid。

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Roots Vacuum Pump

Roots vacuum unit operation

The operating safety and stability of Roots vacuum unit is high because the unit has the function of operation protection. Its operation protection function has many, the following vacuum pump to briefly introduce. 

Roots vacuum unit has more than 30 protection functions, including compressor overload, overheating, locked rotor protection; system high pressure, low pressure and differential pressure protection; evaporator water temperature too low protection, evaporator antifreeze protection, condenser water temperature too low protection, abnormal water flow protection.

There are also over-voltage, under voltage, three-phase imbalance, under reverse phase protection for the power supply to the unit from the client; and password protection function to prevent the unit failure caused by the wrong operation of the unauthorized person; at the same time, it has the power on self-test function to avoid the abnormal start-up of the unit; in addition, it has the condenser cleaning reminder function.

These operation protection functions make the use of Roots vacuum unit more convenient and safe. If you want to better use roots vacuum unit, you must do regular inspection and maintenance work to ensure the normal operation of Roots vacuum unit.

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Roots Vacuum Pump 

Vacuum system of pumping steam

In the process of vacuum impregnation, vacuum drying and vacuum freeze-drying, the gas extracted from the vacuum system is mainly steam and other condensable steam, and the working vacuum degree is mostly 10 ~ 10-1pa. In foreign countries, roots pump and oil seal mechanical pump are usually used for air extraction. For this reason, in recent years, the maximum inlet pressure of water vapor is the index of foreign oil sealed mechanical pumps (usually 103 ~ 3 × 103pa), while the domestic oil sealed mechanical pumps generally do not have this index. Moreover, the check function of some mechanical pumps equipped with air ballast valve is not strong, and the gas ballast effect is not obvious, which can not achieve the purpose of large amount of steam pumping, resulting in a large amount of steam condensation in the pump oil, Oil and water mixed to form white emulsion, reducing the sealing and lubricating performance of mechanical pump. The corrosion liquid will cause rust inside the pump body, and the rusty iron powder will fall into the oil and become reddish brown, and circulate in the pump together with the pump oil, which will have adverse effects on the service life and limit vacuum degree of the pump. 

(1) The steam jet pump is suitable for the vacuum system with large displacement, and the system needs to be equipped with working steam source.

(2) Oil booster pump + oil seal mechanical pump, the system is not suitable for the gas phase drying of transformer, especially in the oil booster pump, the naked electric furnace is strictly used, otherwise the open fire is easy to cause explosion accident.

(3) ZJ Roots pump + ZJ Roots pump + double stage water ring vacuum pump, the pumping system can obtain higher limit vacuum degree and larger displacement. However, the investment cost of the system is high, and it is easy for the working fluid of the water ring pump to flow back into the vacuum container, and the pumping efficiency of the water ring pump is low, and the unit power consumption is 50% higher than that of the slide valve pump. For example, various types of roots water ring vacuum unit.

(4) Slide valve pump + water ring pump or ZJ Roots pump + slide valve pump + water ring pump, because the slide valve pump is equipped with a front stage pump (water ring pump) in the system, so its compression ratio is reduced, so the water vapor is rarely condensed in the slide valve pump, but there is still a defect in Item 3.

(5) ZJ Roots pump + rotary vane vacuum pump is equipped with high-efficiency gas ballast valve, reliable oil-water separator and reasonable design of lubrication system, so that the system can operate continuously at the inlet steam pressure of 3000pa. This is an economical and reliable vacuum system for pumping steam abroad in recent years. For example, various types of rotary disc vacuum unit.

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Roots Vacuum Pump 

Cooling conditions of vacuum pump

Cooling conditions of vacuum pump

The cooling of vacuum pump helps the efficient use of the equipment, but its cooling should be under certain conditions. The following is the relevant introduction.

1. As for the medium with temperature lower than 120 ℃, generally no special cooling system is set, and the medium of vacuum pump itself is mostly used for smoothing and cooling. The suspension structure can be selected to make the upper limit of temperature reach 140 ℃ ~ 160 ℃. It is worth mentioning that the medium easy to crystallize or rich in particles should be equipped with a sealing surface flushing pipeline (interfaces are generally reserved in the design).

2. For the medium above 120 ℃ and within 300 ℃, generally, the vacuum pump cover must be equipped with a cooling chamber, and the sealing chamber should also be connected with the cooling liquid. When the cooling liquid is not allowed to penetrate into the medium, it should be connected after the medium is cooled (it can be completed through a simple heat exchanger).

To cool the vacuum pump, it is necessary to cool it according to the temperature of the medium, and pay attention to the correct method.

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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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