How to use the vacuum pump and what are the precautions

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The correct way to use a vacuum pump is:

1. First of all, remove the air intake cap and connect the pumped container, and the pipeline used should be short.

2. Check whether the connection of the air inlet is tight, whether the pumped container and the pipeline used are sealed reliably, and there shall be no leakage.

3. Remove the exhaust cap on the trap, turn on the power switch, and the pump starts to run.

4. After the pump is used, close the valve between the pump and the pumped container.

5. Turn off the power switch on the pump and unplug the power plug.

6. Dismantle the connecting pipe.

Vacuum pumps

Vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physicochemical methods to pump air from the pumped container to obtain vacuum. In layman's terms, a vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in an enclosed space. According to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types, namely gas capture pumps and gas transfer pumps.

It is widely used in metallurgy, chemical industry, food, electronic coating and other industries. Commonly used vacuum pumps include dry screw vacuum pumps, water ring pumps, reciprocating pumps, slide valve pumps, rotary vane pumps, roots pumps and diffusion pumps. When Zensan repairs the electric pump, it is also necessary to ensure that insulated gloves and protective helmets are worn.

It is characterized by a large pumping speed over a wide pressure range; The rotor has good geometric symmetry, so the vibration is low and the operation is stable. There are gaps between the rotors and between the rotor and the housing, and the modulus does not need lubrication, and the friction loss is small, which can greatly reduce the driving power, so as to achieve higher speed; There is no need for oil sealing and lubrication in the pump chamber, which reduces the contamination of the vacuum system by oil vapor.

Pro, 1Experimental operators should not carry electronic products during operation. 2.

The experimental operator needs to wear vacuum equipment operating gloves to operate, and cannot directly touch the vacuum equipment. 3.Vacuum pump equipment accessories should be kept in a drying oven and away from corrosive chemical gases or liquids.

4.The vacuum pump equipment needs to be wiped regularly, and dust-free paper or dust-free cloth should be used to clean it with alcohol or acetone. 5.

The laboratory should be kept dry, and the laboratory operators should check the humidity and temperature of the laboratory daily. 6.The laboratory should be well ventilated to avoid the effects of oil and gas caused by mechanical vacuum pumps.

7.The operator should pay attention to the temperature of the pump used in the vacuum equipment to avoid overheating and shortening the life of the instrument. 8.

The operator should insert nitrogen or liquid nitrogen after the molecular pump speed has dropped below the safety line. 9.The operator should pay close attention to the degree of loss of the power interface of the high-voltage pump to prevent the operator from being electrocuted and ensure safety.

10.When the experimenter operates, the valve should be opened and closed in strict accordance with the operation steps of each vacuum equipment to prevent the back-pumping phenomenon caused by the air pressure difference. 11.

When the alarm bell is loud, Chezhou should not conduct any more experiments, and should immediately notify the person in charge of the laboratory.

After the home is stored, the overall home environment will become more tidy. At this time, the emergence of compression bags can help people better organize their home environment. When using compression bags, we must learn how to use the compression bag vacuum pump, and then I will talk to you about the precautions for the compression bag vacuum pump.

How to use the vacuum pump for compression bags.

The first step in vacuuming the bag is to dry the quilt before putting it in the zipper, then fold it into a shape that is easy to store and put it in as much as possible in the bag, at least a few centimeters away from the zipper. Before closing the zipper, check whether the zipper sealing part is clean, whether there are fine fibers or dust (fine fibers or dust may reduce the sealing of the vacuum compression bag, resulting in air leakage of the vacuum compression bag, if so, please wipe it clean with a water-soaked rag.)

The second step of using the compression bag vacuum pump: install the slide, press the slider zipper with your hand, slowly and gently pull to the other end of the zipper, when it is two-thirds of the way, squeeze or roll the clothes or quilt to let most of the air out, and quickly use the slide to pull the remaining one-third of the part up (so that you can save a lot of time and effort when pumping with a hand pump).

The third step in using the compression bag to pump the vacuum pump: pumping with a manual air pump: open the valve cover, aim the air pump at the valve mouth, and pull the piston to pump the air (when pumping the large-capacity bag, due to the slightly longer pumping time, you don't have to take out the pump and cover the lid during the break, and the gas will not be sucked back).

Open the closed zipper and take out the quilt to dry, and then it can be restored to its original shape.

Precautions for compression bag vacuum pump.

Precautions for the vacuum pump of the compression bag: If there are protrusions such as buttons and zippers, please fold the protrusions outside and inside, and do not touch the surface of the compression bag, otherwise, the surface of the bag will be easily damaged when the air is removed;

Precautions for the compression bag vacuum pump: the compression rate and recovery rate of the bedding will vary due to different materials; If the antibacterial surface (the inner layer of the bag) is dirty, the antibacterial effect may not be sufficient, so please dry it thoroughly with gauze soaked in water and clean the inside of the bag before use.

Through the above description of the eggplant banquet, through the introduction of the use of the compression bag vacuum pump and the precautions, you must have mastered the relevant knowledge of the compression bag and its necessary vacuum pump. Through such an introduction, it can help everyone to organize their home life, which is conducive to giving people a neat and tidy home life.

Hello dear. Check the oil quality frequently, and replace the new oil in time to ensure that the vacuum pump works normally. The oil change period is considered according to the actual use conditions and whether it can meet the performance requirements, etc., and is determined by the user's discretion.

Generally, when the new vacuum pump mallet cleans the dry gas, it is recommended to change the oil once in about 100 hours of work. After the ferrous metal powder is not visible in the oil, the oil change period can be appropriately extended in the future. Under normal circumstances, the mold should be overhauled after 2000 hours, check the aging degree of the rubber seal, check whether the exhaust valve is cracked, and check the dirt on the exhaust valve seat.

Clean the entire vacuum pump chamber with parts such as rotors, rotary vanes, springs, etc. Generally, use gasoline to clean the umbrella and Yunluan Hang, and wipe it with a dry cloth after cleaning. When cleaning and assembling, it should be handled with care and careful of bruising.

If possible, the pipe should also be cleaned to ensure that the pipeline is unblocked. After reassembly, a trial run should be carried out, generally 2 hours of dry operation and oil change twice, because there will be a certain amount of volatile substances left in the vacuum pump during cleaning. Check whether there is loosening in the vacuum pump pipeline and joints.

Turn the vacuum pump by hand to see if the vacuum pump is flexible.

First of all, determine what type of vacuum pump you are, take a single-stage oil pump as an example:

1. Check the oil level to avoid lack of oil, and generally replace the lubricating oil once a month or so.

2. Check the cleanliness of the pump surface, the surface is clean, and the pump has good heat dissipation.

3. Observe the exhaust port, if there is oil smoke in the exhaust port, the exhaust filter element needs to be replaced.

4. Do basic maintenance once a year or so!

5. Do a major maintenance every three to five years!

Before starting, check the oil level of the crankcase of the reciprocating vacuum pump, the oil level of the cylinder oil cup, and whether there are impurities in the oil.

Turn on the cooling water and check whether the cooling water of the jacket jacket of the reciprocating vacuum pump cylinder is unobstructed.

Check if the vacuum gauge is sensitive or malfunctioning.

Test drive before driving and check whether the parts are faulty.

Before the gas is sucked into the vacuum pump, it passes through a buffer tank to separate the dust, oil or droplets. corrosive gases should.

The gas should be filtered, washed and treated with acid or alkali respectively, and the acid and alkali should be checked frequently to see if the liquid is invalid.

In the process of use, if you find that the vacuum level is reduced, you should check whether the vacuum system is leaking, and whether there are valves that should not be opened and forget to close.

If water vapor is extracted, the water vapor from vacuum distillation, vacuum evaporation and other equipment should first pass the gas through the condenser to make it.

Some of the water vapor condenses, allowing only the non-condensing gas to enter the vacuum pump.

After the shutdown, close the cooling water valve and put the buffer tank to store water. The buffer tank is generally placed indoors to avoid the phenomenon of freezing water storage in winter.

Determine the operating vacuum range.

First of all, it is necessary to check and determine the vacuum level required for each process. Because each process has its own range of vacuum levels, it must be carefully studied and determined.

Determine the ultimate vacuum.

Check the ultimate vacuum of the vacuum pump system on the basis of determining the vacuum level required by the process, because the ultimate vacuum level of the system determines the optimal working vacuum level of the system. Generally speaking, the ultimate vacuum of the system is 20% lower than the operating vacuum of the system and 50% lower than the ultimate vacuum of the backing pump.

The type of gas to be pumped and the amount of gas to be pumped.

Check to determine the type and volume of air extraction required by the process. Because if the type of gas being pumped reacts with the liquid inside the pump, the pump system will be contaminated. At the same time, consideration must be given to determining the appropriate exhaust time and the amount of gas produced during the pumping process.

Vacuum volume. Check to determine the time required to reach the required vacuum level, the flow resistance and leakage of the vacuum pipe. Considering that after reaching the required vacuum level, the pumping rate required for vacuum is maintained under certain process requirements.

Precautions for choosing a vacuum pump:

1. Whether the vibration generated by the vacuum pump has any impact on the process and the environment. If the process does not allow it, a non-vibrating pump should be selected or anti-vibration measures should be taken.

2. Understand the composition of the pumped gas, whether the gas contains condensable vapor, whether there is particle dust, whether it is corrosive, etc. When choosing a vacuum pump, you need to know the gas composition and select the appropriate pump for the gas being pumped. If the gas contains vapors, particles, and corrosive gases, it should be considered to install auxiliary equipment such as condensers, dust collectors, etc. on the inlet line of the pump.

3. Under its working pressure, the vacuum pump should be able to discharge all the gas generated during the process of vacuum equipment.

4. Correctly combine the vacuum pumps. Because the vacuum pump has selective pumping, therefore, sometimes the selection of a pump can not meet the pumping requirements, and several pumps need to be combined to complement each other to meet the pumping requirements. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but cannot pump helium, and the three-pole sputtering ion pump, (or the two-pole asymmetric cathode sputtering ion pump) has a certain pumping speed for argon.

In addition, some vacuum pumps cannot work at atmospheric pressure and need to be pre-vacuumed; Some vacuum pump outlet pressure is lower than atmospheric pressure, and a backing pump is required, so the pumps need to be combined.

5. The requirements of vacuum equipment for oil pollution. If the equipment strictly requires oil-free, various oil-free pumps should be selected, such as: water ring pumps, molecular sieve adsorption pumps, sputtering ion pumps, cryogenic pumps, etc.

If the requirements are not strict, you can choose to have an oil pump, plus some anti-oil pollution measures, such as cold traps, baffles, oil traps, etc., can also meet the requirements of clean vacuum.

6. Choose the working point of the vacuum pump correctly. Each pump has a certain working pressure range, such as: 2BV series water ring vacuum pump working pressure range 760mmHg 25mmHg (absolute pressure), in such a wide pressure range, the pumping speed of the pump changes with the pressure (refer to the performance curve of the pump for detailed changes), and its stable working pressure range is 760 60mmHg.

Therefore, the working point of the pump should be selected within this range, and it should not be allowed to work for a long time at 25 30mmHg.

7. What is the impact of the oil vapor discharged from the vacuum pump on the environment? If the environment does not allow pollution, you can choose an oil-free vacuum pump, or exhaust the oil vapor to the outside.

8. The working pressure of the vacuum pump should meet the requirements of the ultimate vacuum and working pressure of the vacuum equipment. For example, a vacuum drying process requires a working vacuum of 10mmHg, and the ultimate vacuum of the selected vacuum pump should be at least 2mmHg, and it is best to reach 1mmHg.

Generally, the ultimate vacuum of the selected pump is half to an order of magnitude higher than the working vacuum of the vacuum equipment.

9. The cost of vacuum pump, operation and maintenance.

I don't know what vacuum pump you want to ask, when using a dry vacuum pump, pay attention to the clean gas before the pump and the solvent after the pump**.