Roots water ring vacuum unit

Roots water ring vacuum unit is composed of roots pump as main pump and water ring pump as front pump in series. It can be understood as two main points: water ring pump and roots pump. 

Both roots pump and roots vacuum unit have a number of utility model patents, for example, the series Roots vacuum unit that can be started at the same time solves the shortcomings of the start-up mode of Roots vacuum unit in the prior art, such as long time consuming, low efficiency and large energy consumption, mainly including the front vacuum pump and roots vacuum pump driven by the motor of Roots vacuum pump An exhaust port is arranged on the roots vacuum pump, an air suction port is arranged on the roots vacuum pump, a pneumatic ball valve is arranged between the front vacuum pump and the roots vacuum pump, and the motor, the pneumatic ball valve and the differential pressure detection device of the front vacuum pump are all controlled by the control cabinet. The beneficial effect of the utility model is: on the premise of ensuring that the motor of the roots vacuum pump is not overloaded, the pumping speed is increased by controlling the pressure difference between the inlet and outlet of the roots vacuum pump, so as to shorten the starting time of the vacuum unit.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

How to check the oil seal leakage of vacuum pump

No matter whether the water ring vacuum pump is pumping air or water, there should be no leakage. Check the oil seal carefully before use to see if it leaks. Oil seal is a kind of seal often installed in water ring vacuum pump equipment, which has good sealing effect. How to check whether the vacuum pump oil seal leaks? 

1. The water level indicator in the vacuum system is not broken or leaking.

2. Close the drain valve on the steam side of the condenser to prevent leakage.

3. Check whether the water ring vacuum pump is under negative pressure, whether the water level of the low pressure heater is normal and whether the drain valve is sealed.

4. Check whether the exhaust steam safety valve of low pressure cylinder is in good condition and there is no air intake.

5. Check whether the gravity return water of the speed control feed water pump leads to the condenser. If the return water volume is small and the water seal bag cannot be sealed, the gravity return water from the sealing water of the water supply ring vacuum pump should be poured into the groove.

6. Check the area connecting the vacuum exhaust pipe and the cylinder for air leakage. When the load drops, the air leakage will be reduced, while when the load rises, the vacuum will increase slightly.

7. If the water seal, pipe, flange or weld of vacuum system valve is not firm, especially the pipe and valve port from expansion tank or boiler start-up separator to condenser.

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industrial vacuum pumps,vacuum furnaces

Energy saving corrosion resistant vacuum pump

Many of the corrosion-resistant vacuum pumps rely on pressure to work better. Therefore, proper decompression is beneficial. How do we look at the discharge pressure of energy-saving vacuum pumps? 

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

Therefore, in the actual operation and maintenance of corrosion-resistant vacuum pump, we should pay attention to the real-time observation of the exhaust pressure data of the vacuum pump system. When there is abnormal exhaust pressure data, the corresponding measures should be taken immediately to update and transform the whole vacuum system, so that the exhaust pressure of the vacuum system can be maintained in the national standard or recommended by the manufacturer for a long time, so as to ensure that the energy-saving vacuum pump is always in place Under the optimal working conditions, the overall operation mechanical efficiency of water ring vacuum pump can be effectively improved.

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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.

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Analysis on installation of water ring vacuum pump unit

The key to the installation technology of water ring vacuum pump unit is to determine its installation height. This height refers to the vertical distance between the water surface of water source and the center line of impeller, which can not be confused with the allowable vacuum height. The vacuum value on the water ring vacuum pump's water inlet section is indicated on the nameplate or product manual of the water ring vacuum pump, and it is under 1 standard atmospheric pressure and when the water temperature is 20 ℃, The installation height of water ring vacuum pump should be allowed to absorb the vacuum height after deducting the loss head of the suction pipe. It needs to overcome the actual terrain suction height. 

The installation height of water ring vacuum pump unit should not exceed the calculated value, otherwise it will not be able to pump water. In addition, the influence of the calculation value is the resistance loss head of the suction pipe. Therefore, the shortest pipeline layout should be adopted, and the fittings such as elbows should be installed as few as possible, and the water pipe with larger diameter can also be considered to reduce the flow velocity in the pipe. It should be pointed out that when the elevation and water temperature of the water ring vacuum pump installation site are different from the test conditions, the calculated value should be corrected. That is, the atmospheric pressure at different altitudes and the saturated vapor pressure when the water temperature is higher than 20 ℃.

When the water temperature is below 20 ℃, the saturated vapor pressure can be ignored. In terms of pipeline installation technology, the suction pipe should be strictly sealed, and no air or water leakage is allowed. Otherwise, the vacuum degree at the water inlet of the water ring vacuum pump will be destroyed, and the water output of the water ring vacuum pump will be reduced, and even the water can not be pumped in serious cases. Therefore, it is necessary to do a good job in pipeline interface work to ensure the construction quality of pipeline connection.
CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Characteristics of vacuum valve

The bottom features of vacuum valve are high air tightness (firm sealing); the resistance to air flow is as small as possible (i.e. the flow of the valve is fully conducted or large); the wear resistance of the sealing parts is good, which can be reused and has a long life; the valve body information and the amount of gas released from the sealing parts are small; the operation is flexible, simple, and the equipment is easy to clean. In addition, the function is reliable and the repair is convenient. On the ultra-high vacuum valve also required to be able to withstand high temperature baking (450 ℃); for the saving valve, it is required to regulate the gas flow evenly. 

Materials of commonly used vacuum valve bodies are metal and glass. Manual vacuum valve driving handwheel is made of high-strength plastics. Glass vacuum piston, also known as "cork", is generally used in glass vacuum system, small vacuum equipment, vacuum gauge regulation or calibration system. The advantages are simple production, convenient operation, easy cleaning and investigation, good chemical stability and insulation, and less outgassing. The vacuum equipment required by industrial production, such as vacuum coating equipment, vacuum exercise equipment, vacuum heat treatment equipment, space environment simulation equipment, rocket engine simulation equipment, satellite surface charged simulation equipment, particle accelerator and controlled nuclear fusion equipment, heavy duty vacuum equipment are required for industrial production Metal valves are used in particle accelerators.

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Vacuum pipeline system of water jet vacuum pump

Water jet vacuum pump consists of nozzle, suction chamber, mixing pipe and diffuser (commonly known as tail pipe). The centrifugal pump is used to increase the water pressure, so that the water with a certain pressure is ejected from the nozzle with high speed jet. At this time, the energy of water changes from pressure to kinetic energy, and the surface pressure of the jet decreases rapidly. Due to the viscous and entraining effect of the high-speed jet on the surrounding gas, the air is continuously sucked in. High velocity moving water column and air flow form foam flow to the diffuser (tail tube) at the mixing pipe, and as the section enlarges, the flow velocity decreases and the pressure rises in the diffuser until the atmospheric pressure is higher than the atmospheric pressure and discharged into the atmosphere. It can be seen that if the tail pipe is too short, the vacuum pumping capacity of the water ejector will be reduced, and if the operation is not careful, it may also cause water backflow. 

In view of the problems existing in the vacuum system, we have taken the following measures for rectification:

1) The pipeline not conforming to the design in the vacuum system was completely replaced. The diameter of outlet pipe of centrifugal pump was changed from 70mm to 80mm, and the diameter of vacuum main pipe was changed from 50mm to 65mm;

2) The installation height of the water jet vacuum pump is raised by 1.4m as a whole, and a 1.2m long tail pipe is installed at the ejector outlet.

After the rectification of the vacuum system, the vacuum pump has played its due role, and the vacuum degree of the vacuum system has reached the design requirements. This rectification work puts forward higher requirements for technical personnel: when working, they should not rely on experience to work. They should first understand the structural principle of the equipment, be good at grasping the key points and breakthrough points of things, and avoid detours. This can be used for reference in future work.

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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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Environmental protection water ring vacuum unit

The environmental protection water ring vacuum unit is designed and optimized according to the requirements of modern enterprises for environment and environmental protection, integrating the characteristics of various industries. The manufacturing unit is composed of water ring vacuum pump, waterway system, vacuum system, cooling system, silencing system and control system. It is mainly designed and manufactured according to the specific conditions of customers 

1. Ensure that the gas and liquid with pollution are concentrated and will not leak, and truly achieve zero pollution

2. Low noise, the use of noise abatement facilities, will not cause noise pollution, especially suitable for the working environment of man and machine together

Application: daily chemical, medical (especially dental), food, pharmaceutical, electronic, laboratory.

Water Ring Vacuum Pump

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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 

liquid ring vacuum pump a centrifugal pump

The first thing to understand is that liquid ring vacuum pump is not a centrifugal pump. We can make a clear distinction between them from the place of practical application. Of course, both of them have the application of centripetal force. However, liquid ring vacuum pump is used to pump vacuum gas, which is a kind of volumetric gas equipment. And centrifugal pump is used to deliver liquid, belongs to the speed type fluid equipment. One is a vacuum pump, the other is a water pump one by one. 

The centripetal force in liquid ring vacuum pump is mainly used to throw the liquid around the impeller in the process of rotation to form a ring with a certain thickness for blocking. The impeller is an eccentric device, so a relatively closed crescent shaped space will be formed between the liquid ring and the cavity. At the same time, the ring is blocked to separate the impeller, and some spaces are separated into independent suction and exhaust spaces. In the process of rotation, after the volume change of the blocked space, the process of suction, contraction and exhaust is completed, and the gas in the vacuum chamber is removed. In the early stage, liquid ring vacuum pump was also used in self suction pump.

And centrifugal pump, is simply relying on the centripetal force generated when the impeller rotation to protect the liquid pump. The impeller of the concentric device rotates at high speed in the cavity filled with water. The water is thrown out. At the same time, a vacuum negative pressure is formed in the pump cavity, and the new water is sucked in. This circulation completes the liquid delivery.

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Concept of critical compression ratio of water ring vacuum pump

 When the operating condition of water ring vacuum pump exceeds the critical contraction ratio, how to modify the internal structure to reduce the air loss of the pump to the minimum and the performance of the pump to achieve the optimal, which has important reference significance for application and system transformation. 

As a variable volume gas delivery equipment, water ring vacuum pump can not only be used as a vacuum pump to remove gas to make the system obtain negative pressure, but also as a tightening machine to tighten the gas so as to make the system get positive pressure. However, whether it is a vacuum pump or a tightening machine, its internal water ring volume changes and completes the suction and exhaust principle is the same, so the work of water ring pump in different states is fundamental It can be divided into several stages.

The working principle of water ring vacuum pump is to use eccentric impeller device in the pump body. The impeller rotates to throw the water in the pump cavity to the surrounding. The water ring with different thickness is formed in the pump cavity. The water ring and adjacent blades form an alternating space to complete the suction and exhaust function. The gas delivery channels are crescent shaped spaces designed on the disk, but their functions are not only "channels". The influence of the opening size and position of the suction and exhaust holes on the pump performance is very obvious. The suction volume of the vacuum pump decreases with the increase of the contraction ratio. When the critical contraction ratio is exceeded, the efficiency of the water ring pump will obviously decline.

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water ring vacuum pump overall application

By reflecting the strength of water ring vacuum pump products, in the application process of enhancing the application and performance development of its products, it is necessary to continuously speed up the overall play of its practical performance with high-quality performance advantages. In order to speed up the promotion of product utilization advantages and fully reflect the embodiment of product value ability, it is necessary to improve the product performance driven by product application and strength, so as to achieve high-efficiency Quality application ability, expand the overall promotion of its advantage role, and constantly enhance the play of its product value ability. 

Focusing on the performance advantage of water ring vacuum pump, we should give full play to the product advantage level, continuously enhance the overall driving force of its quality strength, through the reliability promotion of its value application performance, with the rapid development of product advantages, realize the role of improving the overall performance of the product, do a good job in the promotion of product application and performance advantages, and develop the overall promotion of its quality So as to speed up the pioneering of its performance advantage level.

In order to speed up the continuous improvement of water ring vacuum pump quality performance, it is necessary to improve the product strength, enhance the pioneering ability of product application and advantage, accelerate the overall improvement of its quality and practical ability, increase the continuous improvement of its quality strength and expand the overall development of its product practical performance with reliable product application effect.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

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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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.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

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Vacuum pump in high tech industry

Now in the vacuum profession, the oil-free vacuum pump with good cleanliness and high vacuum degree is paid more and more attention by various professions. In China, the development of this process is still in its infancy, and the demand for practice is constant. 

For example, more than 70% of the vacuum industry in Japan is used in semiconductor and liquid crystal display (LCD) industries. The traditional vacuum system can not meet the requirements of cleaning, oil-free and corrosion resistance. Therefore, molecular pumps and cryogenic pumps in dry vacuum pumps in Japan are developing rapidly. At present, vacuum products have been updated, and many oil vacuum systems have been replaced by oil-free and clean vacuum systems.

From the proportion and trend of various types of vacuum pumps in China, it can be seen that the vast majority of vacuum industry in China is concentrated in the general traditional vacuum application, so the high vacuum system is still dominated by lax pumps, while the low vacuum and front stage vacuum are mainly rotary vane vacuum pumps and sliding valve pumps. The production of turbo molecular pumps is the smallest. Large or composite molecular pumps do not form batch production. As for low-temperature pumps and various types of dry vacuum pumps, they are just in the beginning, unable to meet the needs of semiconductor industry and LCD industry.

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Installation and use of rotary oil pump

When installing the rotary pump, certain rules must be observed: the pump with small displacement (moving plate and fixed piece type) should be fixed on a considerable base, and when installing the pump, it should be considered that the use process is easy to access, so as to observe its working conditions and replace new oil. 

Piston pump should be installed on the foundation and fixed with bolts, nuts, washers and lock nuts. After installation, the pump must be cleaned with clean cloth.

Before starting the pump, it must be washed with vacuum oil, and then injected with the required amount of pumping. When the pump motor and circuit connected, must be sure that the motor belt rotation direction is correct.

To do this, the drive belt must be removed from the pulley of the pump, and then the motor is switched on. If the rotation direction of the motor pulley is consistent with the direction indicated by the pointer on the pump cover, it is correct to turn on the motor (if it is standing against the motor, its pulley should rotate clockwise).

After the motor stops rotating, put on the drive belt, tighten it with the fastening bolt on the sliding plate, and finally fix the motor firmly (at this time, the intake pipe of the pump should be sealed).

After that, the pulley of the pump must be rotated by hand for several turns, and then the pump is turned on, and the limit empty caused by the pump is measured. In order to prevent the oil from splashing out of the pump, do not switch on the pump at once, but turn on the motor intermittently several times in a short time interval, and the rotation of the pump rotor is not greater than half revolution in each time interval.

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Principle of gas liquid separation by reciprocating vacuum pump

Do you know much about reciprocating vacuum pump? If you don't know much about it, the following will help you. Let's introduce the principle of reciprocating vacuum pump to realize gas-liquid separation. Let's take a look at it 

The liquid water of reciprocating vacuum pump will spread on the surface of hydrophilic material. If the porous structure is made of hydrophilic material (there is a gap between the holes), the porous structure will become a special channel for liquid water, just like many capillary tubes. In the same way, porous structure made of hydrophobic materials will become a special channel for gas. In this way, the hydrophilic or hydrophobic properties of the material are used to realize gas-liquid separation.

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The limit pressure of vacuum pump

Shortly after the vacuum pump started to work, the minimum pressure P'g appeared. The vacuum pump continues to operate. Because of the increase of vacuum pump temperature, the saturated vapor pressure and viscosity of vacuum pump oil rise and viscosity drop, and the inlet pressure slightly rises to PG. PG is the stable minimum pressure obtained by the vacuum pump, and also the limit pressure of the vacuum pump. 

The limit pressure of the rotary vane vacuum pump is related to the type of vacuum gauge used in measurement. When the compression vacuum meter is used, the limit pressure value is about one order of magnitude lower than that measured by the heat conduction vacuum meter (thermocouple or piezometer, etc.). This is because the former can only measure the partial pressure of permanent gas, the latter is the total pressure of the compressed gas. The current regulations of our country use compression vacuum gauge to measure the limit pressure of oil seal mechanical vacuum pump.

The circulating oil quantity of vacuum pump also affects the limit pressure of vacuum pump. With the increase of oil quantity, the better sealing effect is, the relationship between the limit pressure and oil quantity of vacuum pump changes, and the saturation vapor pressure Po of oil is achieved. In fact, there is a lot of air and water in the vacuum pump oil. After the vacuum pump oil enters the vacuum pump cavity, the air and water absorbed in the vacuum pump oil are released. The relationship between the limit pressure and the oil quantity of the vacuum pump develops upward.

Generally, the vacuum pump oil should be kept on the specified oil level, so that the circulating oil quantity of the vacuum pump should be kept to a certain extent. For double stage vacuum pump, vacuum pump oil can enter high vacuum stage only after degassing at low vacuum stage, so that the amount of air discharge of vacuum pump oil in high vacuum stage can be reduced, so as to reduce the limit pressure of vacuum pump.

The limit pressure of vacuum pump is related to the working temperature of vacuum pump oil. The higher the oil temperature, the higher the saturated vapor pressure of the oil, the higher the limit pressure of the vacuum pump.

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Choose vacuum valve rubber gasket seal

In the application of vacuum system, the installation of vacuum valve needs rubber gasket seal or metal gasket seal to ensure the sealing performance of the system.

Rubber gasket seal is made of rubber material, which uses the rubber gasket pressed between valve plate and valve seat, and fills the uneven surface by elastic deformation of rubber to realize sealing. In the selection process, attention should be paid to:

1、 The selected rubber gasket sealing structure should be simple and easy to manufacture.

2、 The seal shall be easy to disassemble and repair. 

3、 As far as possible to reduce the bleeding factor of the high vacuum side under the valve plate, such as choosing the gasket material with low outgassing rate.

4、 After closing the valve, the rubber seal ring section should have the maximum compression deformation.

At the same time, the uneven degree of the rubber gasket sealing seat surface determines the sealing performance when the vacuum valve is closed. Therefore, it is necessary to consider the hardness of the rubber gasket sealing material, the degree of compaction and the surface roughness of the valve seat, and determine the compression ratio of the gasket according to these, so as to achieve the corresponding sealing performance.

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