Small vacuum pump

Small vacuum pump

Small vacuum pump is also called micro vacuum pump because of its small volume. Small vacuum pump (i.e. micro vacuum pump) refers to an instrument that has one suction nozzle and one exhaust nozzle, and can continuously form vacuum or negative pressure at the inlet; micro positive pressure is formed at the exhaust nozzle; the working medium is mainly gas, and the volume is small. Small vacuum pump can be used for air conditioning, refrigeration equipment repair, suction device of medical instruments, printing machinery, vacuum packaging, vacuum plastic suction, physical and chemical experiments and small devices requiring vacuum environment. The scope of application covers scientific research, gas sampling, instruments, chemical analysis, medical and health care, medical and health care, bioengineering, automatic control, environmental protection, water treatment and many other fields.

The small vacuum pump is not suitable for pumping out the gas which corrodes the ferrous metal, reacts with the pump oil chemically, contains the particle dust, as well as the toxic gas which contains too much oxygen and is explosive. It can not be used as a transfer pump (i.e. pumping from one container to another).

The circular motion of the small vacuum pump motor makes the diaphragm inside the pump do reciprocating motion through the mechanical device, so as to compress and stretch the air in the fixed volume pump cavity to form a vacuum (negative pressure), and generate a pressure difference with the external atmospheric pressure at the pump suction port, under the effect of the pressure difference, the gas pressure (suction) into the pump cavity, and then discharge from the exhaust port.

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How is the vacuum pump driven

How is the vacuum pump driven? Let's have a brief understanding next.

The two rotors of vacuum pump are operated synchronously by a pair of high precision gears. The driving shaft is connected with the motor through the coupling. There are mainly two types of transmission structure: one is that the motor and gear are placed on the same side of the rotor.

Driven rotor is directly driven by the motor end gear, so that the torsional deformation of the active rotor shaft is small, the gap between the two rotors will not be changed due to the large torsional deformation of the active shaft, so that the gap between the rotors is even in the operation process.

The biggest disadvantages of this kind of transmission mode are: A. There are three bearings on the driving shaft, which increases the difficulty of pump processing and assembly, and the disassembly and adjustment of gears are also inconvenient; B. the overall structure is uneven, and the center of gravity of the pump is inclined to one side of the motor and gearbox.

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Repair steps of vacuum pump unit

The gas compression of vacuum pump unit is isothermal, which can remove flammable and explosive gas. It is hard to avoid poor maintenance in use, and the conventional repair method is welding. However, some parts are made of cast iron, aluminum alloy and titanium alloy, which are difficult to be welded, and even some dangerous occasions prone to explosion are not easy to be welded. So how to fix this situation?

1. Apply a thin layer of material first to ensure the bonding and full coverage of the vacuum pump unit, and then evenly apply the material to the repair surface to achieve the required repair thickness.

2. When the material temperature is increased by 11 ℃, the curing time will be shortened by half, but the rising temperature shall not exceed the bearing temperature of the material.

3. Remove the oxide layer on the surface of vacuum pump unit and clean the surface with acetone.

4. Mix strictly according to the proportion, and mix evenly until there is no color difference.

The "cold welding" technology of vacuum pump unit can avoid thermal stress deformation, at the same time, the material has good adhesion, compression resistance, corrosion resistance and other comprehensive properties, which can meet the use requirements of various equipment components to a greater extent, so as to effectively ensure production with low cost investment. Safe, convenient and reliable. These repair methods must be kept in mind, very helpful.

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Vacuum drying technology of vacuum pump dryer

Vacuum drying technology of vacuum pump dryer

Vacuum drying technology of vacuum pump unit is applicable to the concentration, mixing and drying of powdery, granular and fibrous materials in chemical, pharmaceutical, food and other industries, and the materials requiring low-temperature drying (such as biochemical products, etc.) are more applicable to the drying of materials that are easy to oxidize, volatilize, heat sensitive, strong stimulation, toxic materials and materials that are not allowed to destroy crystal. Here is a specific introduction The technical advantages.

1, chemical, food, health products and other industries drying products, spray drying is conducive to the cost, but the solubility of products. There are big defects in the original taste and the shape of the powder, and there is nothing to do for the products with slightly higher viscosity and heat sensitivity requirements. Conventional freeze-drying can obtain the solubility and high quality products of inferior products, but the output is too low and the cost is expensive.

2. It can make the inner part of the dried product porous and loose. The technological indexes of the low temperature continuous vacuum pump dryer are just between the two kinds of equipment. The original material property and appearance of the product are good. Due to vacuum and low temperature drying, it can meet the processing requirements of local heat sensitive materials.

3. The static drying is transformed into dynamic drying. It greatly improves the output of dry products and reduces the production interest. The dryer of low temperature continuous vacuum pump unit breaks through the technical problem of continuous feeding and discharging under vacuum.

4. Drying of high fat, high sugar and other materials. And can adhere to the stability and consistency of product batch. Low temperature continuous unit dryer is especially suitable for spray drying and high viscosity which is difficult to solve in vacuum oven.

Therefore, when using the vacuum drying technology of vacuum pump unit, it is necessary to pay special attention to the above-mentioned content, so as to avoid damage to the unit due to some of its own wrong operation. At the same time, I suggest that you can learn more about the relevant knowledge of the unit, which is very helpful for your operation.

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Cooling method of water ring vacuum pump unit

Under the long-term use of the water ring vacuum pump unit, the equipment will emit heat. If the heat emitted in a certain period of time is too much, the equipment will be damaged to a certain extent. Therefore, we need to have certain treatment measures at this time. Today we will explain the four treatment methods about cooling for you.

1. Oil film cooling of rotor

The cooling method is to connect an oil pipe at the inlet of the water ring vacuum pump unit, and take the heat of the rotor away with the evenly dripping cooling oil.

2. Air cooling

The so-called wet vacuum pump, that is, the air inhaled by the interstage or two-stage pump is compressed, and then transmitted through a combined muffler with comprehensive absorption and phase difference.


3. Water cooling

The water ring vacuum pump unit generates heat due to the transmission and compression of gas, which must be transmitted from the rotor to the shell.

4. Internal cooling of rotor

In order to make the water ring vacuum pump unit work under a higher pressure difference, a more effective cooling method can be adopted, that is, the rotor is cooled by circulating oil, and there are oil holes and oil diameter shaft heads at both ends of the pump shaft, which are respectively driven in, and then discharged from the other end through the inner wall of the rotor.

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Cooling mode of heat dissipation of roots water ring vacuum unit

Cooling mode of heat dissipation of roots water ring vacuum unit

When the roots water ring vacuum unit carries out energy conversion, there is always a small part of loss converted into heat. It must continuously dissipate the heat through the motor shell and surrounding medium. This process of heat emission is called cooling. There are four commonly used methods:

1. Internal cooling of the rotor. In order to make the roots water ring vacuum unit work under higher pressure difference, a more effective cooling method can be adopted, that is, the rotor is cooled by circulating oil, and the two ends of the vacuum unit shaft are respectively provided with oil holes and oil diameter shaft heads, which are driven through the inner wall of the rotor and then discharged from the other end.

2. Air cooling. That is to say, the air inhaled by the interstage or two-stage pump is compressed and transmitted through the combined muffler with comprehensive absorption and phase difference.

3. Cool down. The roots water ring vacuum unit generates heat due to the transportation and compression of gas, which must be transmitted from the rotor to the shell.

4. The oil film of the rotor is cooled. The cooling method is to connect an oil pipe at the inlet of roots water ring vacuum unit, and take the heat of the rotor away with the evenly dripping cooling oil.

When the temperature of roots water ring vacuum unit is too high, different cooling methods can be adopted to avoid loss

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An analysis of the important role of rotary vane vacuum pump in the process of pumping

The vane vacuum pump plays an important role in the process of pumping. It sucks gas from the air inlet, compresses the gas that has been absorbed, and then discharges the pump. The system can transport the extracted gas from the extracted space to the atmosphere outside the system from the direction of the air inlet to complete the extraction. Two parts of gas are sucked in and two parts are discharged by the rotor rotating once.

The rotary vane vacuum pump has the following functions:

(1) Seal the exhaust valve to prevent the atmosphere from entering the pump through the exhaust valve.

(2) A small amount of pump oil enters into the pump from the exhaust valve and other gaps to play the role of lubrication and cooling, and forms an oil film at the gap between the rotor and the pump body, between the rotor and the rotating disc, which improves the sealing performance and prevents the gas with high pressure discharged from the pump cavity from leaking back to the suction cavity.

(3) When the vacuum degree of the rotary vane vacuum pump is high, the amount of gas is small. After compression, the gas in the exhaust cavity is still not enough to open the exhaust valve. If there is vacuum pump oil in the pump cavity, the exhaust valve can be opened by means of the incompressibility of the oil to achieve exhaust.

In order to ensure good vacuum performance of mechanical vacuum system, there are certain requirements for vacuum pump oil:

(1) The saturated steam pressure of the mechanical pump oil of the rotary vane vacuum pump should be low enough, usually at 20 ℃, the saturated steam pressure is not more than 5.3 × 10-3 PA.

(2) Mechanical pump oil shall have proper viscosity, which is generally specified to be within the range of (47-57x10-6m2 / s) at 50 ℃.

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