Working pressure of vacuum pump
Working pressure of vacuum pump
In the process of using the vacuum pump, its working strength should meet the requirements of the limit vacuum and working pressure of the vacuum equipment. For example, vacuum coating requires a vacuum degree of 1 × 10-5mmhg, and the vacuum degree of the selected vacuum pump shall be at least 5 × 10-6mmhg. Generally, the vacuum degree of the pump is half to one order of magnitude higher than that of the vacuum equipment.
The correct choice of the working point of the vacuum pump, each pump has a certain range of working pressure, such as: diffusion pump is 10-3 ~ 10-7mmhg, in such a wide range of pressure, the pumping speed of the pump changes with the pressure, the stable working pressure range is 5 × 10-4 ~ 5 × 10-6mmhg. Therefore, the working point of the pump should be selected within this range, and it cannot be allowed to work for a long time under 10-8mmhg.
Under its working pressure, the vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment. Combine the vacuum pump correctly. Because of the selective pumping of vacuum pump, sometimes selecting one pump can not meet the pumping requirements. Several pumps need to be combined to supplement each other to meet the pumping requirements. For example, the titanium sublimation pump has a very high pumping speed for hydrogen, but it can't pump helium, while the three pole sputtering ion pump (or the two pole asymmetrical cathode sputtering ion pump) has a certain pumping speed for argon, and the combination of the two will make the vacuum device get a better vacuum degree. In addition, some vacuum pumps can't work under atmospheric pressure and need pre vacuum; some vacuum pumps need pre stage pumps because the outlet pressure is lower than atmospheric pressure, so they need to be combined for use.
Requirements of vacuum equipment for oil pollution. If the equipment is strictly oil-free, various oil pumps should be selected, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, low temperature pump, etc. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as cold trap, baffle, oil trap, etc., can also meet the requirements of clean vacuum.
2BV water ring vacuum pump Working principle
2BV water ring vacuum pump Working principle
The working principle of the 2BV water ring vacuum pump must be understood by every relevant worker, because it is related to the operator's understanding of the equipment and the proficiency of the operation, and indirectly affects the work efficiency. Therefore, the following editors summarize it for everyone Let's take a look at the working principle with the icon:
As shown in the figure, the impeller is eccentrically installed in the pump body, and a certain height of water is injected into the pump when starting. Therefore, when the impeller 3 rotates, the water is subjected to centrifugal force to form a rotating water ring 1 on the inner wall of the pump. The inner surface of the lower part of the ring is tangent to the hub and rotates in the direction of the arrow. During the first half of the rotation, the inner surface of the water ring of the 2BV water ring vacuum pump gradually disengages from the hub. Rotating, the space gradually expands, the space gas pressure decreases, and the gas is sucked in from the disk suction port; during the second half of the rotation, the inner surface of the water ring gradually approaches the hub, the space between the blades gradually shrinks, and the space gas pressure increases. When the pressure is higher than the exhaust port, the gas between the blades is discharged from the disc exhaust port. In this way, every time the impeller rotates for one week, the space between the blades sucks and exhausts once. Many spaces work continuously, and the equipment continuously sucks or pressurizes the gas.
Looking at the working principle of the 2BV water ring vacuum pump above, we found that during the operation of the pump, the working water ring heats up, and at the same time part of the water and gas are discharged together. Therefore, the pump must be continuously supplied with water to meet the working requirements of the pump. I hope that after fully understanding the internal structure principle of the equipment, it will bring some help to everyone's future work.
Emergency treatment of vacuum pump
Emergency treatment of vacuum pump
We all know that any mechanical equipment will inevitably have an emergency when it is used, and vacuum pump is no exception. In this way, operators are required to have good psychological quality and the ability to deal with emergency events. In view of this problem, some emergency treatment methods of vacuum pump are proposed for reference only.
The first point is that when the equipment is in normal operation, it is found that there is a sudden air leak. If the dew point cannot be found immediately, it must be sealed with vacuum sealing mud, and then it can be treated after the work is completed.
The second point is to cut off water and power in case of high temperature. The biggest fear of vacuum equipment is to cut off water and power when it is in high temperature. Therefore, the user needs to have a standby water tank or a tap water pipe when the equipment is installed.
Third, replace the gas cylinder. When the gas cylinder used for the equipment needs to be replaced, remove the pressure stabilizing valve and replace it with a new one. Be sure not to leak during installation.
Fourth, the equipment shall be cleaned and kept clean for a period of time.
2BV Vacuum Pump Impeller Mediation
2BV Vacuum Pump Impeller Mediation
Speaking of 2BV vacuum pump, I believe it will not be strange to know, but do you know the impeller mediation of 2BV vacuum pump? Following is a detailed introduction to you:
In order to ensure the efficient operation of 2BV vacuum pump, the clearance between impeller and front guard plate of 2BV vacuum pump must be adjusted in time. The clearance between impeller and front guard plate of metal lined pump is 0.5-1 mm, and the clearance between impeller and front and rear guard of rubber lined pump should be equal. When adjusting the clearance of impeller of 2BV vacuum pump, stop the pump first, loosen the bolt of pressing bearing assembly, twist the nut on the adjustment bolt, and make the bearing assembly move forward. At the same time, rotate the shaft by hand according to the direction of pump rotation until the impeller of 2BV vacuum pump rubs against the front guard plate.
For metal lined pumps, loosen the nut just tightened in front by half a circle. Then tighten the nut in front of the adjusting bolt to make the bearing assembly move backward. At this time, the clearance between impeller and front guard plate is 0.5-1 mm. For the rubber lined pump, by twisting the nut on the adjusting bolt, the bearing assembly of the 2BV vacuum pump moves forward first, so that the impeller contacts the front guard sleeve, and moves the bearing assembly backward, so that the impeller and the rear guard sleeve move forward. Contact, measure the moving distance of the total 2BV vacuum pump of the bearing assembly, take this distance as the clearance between the impeller and the front and back sheaths, then adjust the position of the bearing assembly with adjusting bolts to ensure the correct clearance between the impeller and the front and back sheaths. After adjustment, the impeller of 2BV vacuum pump should be re-checked before restarting, and the compression bolt and adjustment bolt of bearing assembly should be tightened, then the 2BV vacuum pump should be started.
Water Ring Vacuum Pump Unit Work
To a large extent, the role of water ring vacuum pump unit is to create a preparatory vacuum needed by Roots pump. In general, for single stage vacuum pump unit, we should pay attention to the fact that the ultimate vacuum of itself is not high, and we In fact, we should pay attention to some things.
At present, the pre-vacuum required by our roots pump is actually relatively high. In view of this, we will not use the single-stage water ring vacuum pump unit directly as a front pump on the roots pump. Next, we should pay attention to the extreme pressure. The lower two-stage water ring pump is used as the front-stage pump, which can actually reduce a limit pressure of the unit itself.
In fact, the limit pressure of a vacuum pump unit and a water ring pump is 400 Pa. In this respect, to a large extent, it can directly meet the vacuum demand in general. However, in terms of its scope of use, we should pay attention to its own suffering. To a certain limit.
When we directly connect two Roots pumps in series and then combine them with vacuum pumps, to a certain extent, it can greatly improve the limit pressure of the unit itself (up to 25 Pa). It is precisely because of this, we should pay attention to, in fact, in this type, the more common is that two Roots pumps in series and then use two-stage pumps directly as the components of the former pump unit.
However, as far as the application of vacuum pump unit is concerned, when we need a higher limit pressure, that is to say, we should pay attention to the combination of three Roots pumps and vacuum pump unit. In terms of its limit pressure, to a certain extent, it is actually direct. It reaches 1 Pa.
Exhaust Pressure of Water Ring Vacuum Pump
Technical Process of Read Vacuum Brazing Furnace Products
Vacuum brazing belongs to solid phase bonding, which is different from the melting method. The base metal does not melt during vacuum brazing. Because the brazing metal with lower melting temperature than the base metal is used, the heating temperature in the heating chamber of the vacuum brazing furnace is a connection method which is lower than the solid phase of the base metal and higher than the thick wire of the brazing fluid.
Vacuum brazing furnace is to coat the welded parts of the cleaned and decontaminated workpieces with flux, lay the solder on another part which needs to be welded, and also coat the welding surface with flux. After fixing the two parts, the vacuum brazing furnace will be heated to the temperature of solder melting to complete the welding.
It uses the furnace temperature to raise the temperature of the workpiece, and melts the solder whose melting temperature is lower than that of the workpiece, so that the workpiece can be welded.
In this process, heating should be as slow as possible to keep the internal and external temperatures of the products to be brazed consistent, otherwise the brazing quality will be directly affected.
Preheating, heat preservation, energy storage, heat preservation, brazing, heat preservation and power cut in industrial production are effective technological processes that can not only achieve the above objectives but also improve production efficiency. Vacuum brazing temperature and holding time are the key factors affecting brazing quality.
Vertical single-stage pipeline centrifugal pump
Single-stage single-suction centrifugal pump adopts the most advanced hydraulic model, according to the performance parameters of is centrifugal pump and the unique structure combination design of vertical pump, and strictly according to the international ISO2858 design and manufacture. The product shaft seal uses carbide mechanical seal device, which has the characteristics of high efficiency, energy saving, reliable performance, easy installation and use. Medical Air Compressors And Vacuum System
Design features of single-stage single-suction centrifugal pump: IS series performance range is measured according to design point: rotational speed: 2900r/min or 1450r/min suction diameter: 50-200 mm flow rate: 6.3-400 m3/h head: 5-125 m, sealing mode: packing seal, mechanical seal. Material: Cast iron.Liquid Ring Vacuum Pump In Canning Machinery rotary vane vacuum pump
Vertical single-stage pipeline centrifugal pumps, also known as pipeline pumps, centrifugal pumps, pipeline centrifugal pumps, single-stage centrifugal pumps, vertical pumps, booster pumps, hot water pumps, circulating pumps and so on, are the performance parameters of IS-type centrifugal pumps and SG-type pipeline pumps selected by the experts in the United Nations Water Pump Institute of Technology of our factory. Roots Vacuum Pump
On the basis of general vertical pipeline pumps, ingenious combination design is carried out. At the same time, according to the different use temperature and medium, the suitable hot water pipeline pumps, high temperature corrosion resistant chemical pipeline pumps and pipeline oil pumps are derived from ISG series pipeline pumps. This series of products have the advantages of high efficiency, energy saving, low noise and reliable performance. Water ring vacuum pump
Horizontal clear water pump
Sealing of furnace
If the chimney's outlet is a window, it is recommended to use a square iron plate with a circular hole slightly larger than the chimney on the Tin Street to do this. Note that the chimney should be of good diameter before you buy it. If the exit is on the wall, it is recommended to use mud - feel the gap is not very big, not much, will not affect the aesthetic, of course, can also use lime (lime). That will be more beautiful.
The function is: first, prevent the air from entering the furnace and destroy the stability of the atmosphere in the furnace. Two, prevent air leakage in furnace, reduce pressure in furnace atmosphere and increase consumption of furnace atmosphere. If the furnace atmosphere contains CO, H2, CH4 and other combustible and harmful gas components, gas leakage to the workshop to deteriorate the operating environment of the workshop.
Points for attention in using furnace
roots vacuum pump working principle
To be familiar with the operation of the stove, it is best to operate and disassemble the stove at home, so as to understand the structure of the stove and the way it is used.
Ancient furnace
Only when the fault occurs in the field can we find out the cause quickly. When you buy a new stove and go home, you may find some protective oil on the stove kit, and you can try burning it with a lighter. Careful handling of fuels, especially high volatile fuels, is easy to ignite. Special care must be taken. Fuel should be loaded where the air passes so that the volatile oil and gas can be released with the air.
Using the right fuel, some ovens emphasize the versatility of the fuel, preferably the most suitable fuel recommended by the manufacturer, and for continuous use do not replace it arbitrarily. The use of different fuels is easy to cause blockage in the furnace head, the use of the wrong fuel will damage the furnace, not careless.
Dry Scroll Vacuum Pump Application industry
Check the fuel adequacy before use.
When cooking food, it is better to use the lid to cover it, which can concentrate heat and reduce cooking time. Plus the windshield also has the bonus effect.
Don't store the fuel in the stove, especially liquid fuel, in case it leaks. The best place to store the stove is to keep it dry and prevent metal from rusting.
Try to avoid smoking near the stove, especially when ignition, volatile oil and gas may occur unexpected things!
Oil diffusion pump price
If it is necessary to use a stove in the tent, at least it should be lit outside the tent, and it should be ready to leave the tent at any time when it is used. When the tent is on fire, it burns very fast.
Gas tanks should be handled carefully. Keep them away from heat sources and do not destroy them. The fuel in the gas tanks can cause frostbite to the skin. Don't litter empty gas cans. If they can be recycled, they'll be handed over to the recycler. If they can't be recycled, they'll be taken to the flat ground for waste disposal.
When the furnace burns, it absorbs oxygen and releases toxic carbon monoxide, so never use the furnace in a closed space. Gas tanks that leak can't be used either. Put them in a ventilated place and wait for them to be completely dealt with.
vacuum furnace custom made
Prepare a set of furnace maintenance kits, while familiar with furnace disassembly and maintenance, usually good maintenance of the furnace, out of the activities can be relaxed and happy.
The stove can be placed inside the pot. On the one hand, it can find convenience and protect the stove from collision.
When using the stove, try not to let the soup of food stick to the stove head, in case of leakage, after the stove is used, wait for the stove head to cool and clean up, to avoid stove nozzle blockage.
Horizontal multi-stage fire pump
The xbd-w horizontal multi-stage fire pump is the latest energy-saving product series. It has the advantages of high efficiency, low running noise, good cavitation resistance, reasonable structure and long service life.Molecular Pump For conveying water without solid particles and the physical and chemical properties similar to water in the liquid, it is mainly used for pressurized water supply in fire control system, can also be used in industrial water supply and drainage, pressurized water supply in high-rise buildings, distant distance water, cold and hot water circulation pressurization in heating, bathrooms and boilers, water supply in air-conditioning and refrigeration system and supporting equipment, etc.
The performance and technical conditions of the xbd-w series fire pumps produced by our company conform to the requirements of the newly promulgated gb6245-1998 "fire pump performance requirements and test methods" standard. The products have passed the test by the national fire equipment quality supervision and testing center and obtained the approval certificate of Shanghai fire protection products.
2XZ direct drive rotary vane vacuum pump
All fire pumps of our company are designed and optimized by computer. Our company has strong technical force, rich production experience and perfect testing methods, so as to guarantee the stability and reliability of product quality.
