Working principle of oil sealed vacuum pump

Working principle of oil sealed vacuum pump:

By changing the mechanical vacuum pump exhaust, maintenance and Realization of collective vacuum seal oil seal, pump cavity volume of moving parts. They work in the whole plant mechanical pump cavity volume, reduce the increase in emissions. When the pump chamber becomes the capacity of the working chamber, the pump inlet is connected to the air chamber and the largest until the re suction volume is far away from the pump suction chamber for the longest time. When the volume is reduced until the atmospheric pressure of the gas is higher than that of the compressed gas discharge valve, the discharge pressure of the gas is lower.


For oil seal pump fluid:

Large mechanical vacuum pumps, even the best design, and the relative motion between components are currently used, even with high precision. Vacuum pump limit, which is difficult to prevent low true air "break through" the end of the return inlet. In addition, due to the design, manufacture and inevitable harm of the pump, and reduce the assembly clearance limit vacuum. The components of relative movement between oil sealed vacuum pumps and the sealing of exhaust valves; the opportunity of harmful space filling to make it a "breakthrough" of high pressure gas is much less, more, better sealing performance, it can pump higher vacuum.

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Two requirements for selecting water ring vacuum pump

What should be paid attention to when selecting the imported water ring vacuum pump. The type of imported water ring vacuum pump is mainly determined by the air volume, vacuum degree or exhaust pressure required for operation. When the pump works, the following two aspects should be paid attention to:

1. As far as possible, it is required to operate in the high efficiency area, that is, in the area of critical vacuum degree or critical exhaust pressure.

2. Operation near the maximum vacuum or exhaust pressure shall be avoided. In this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For the imported vacuum pump with high vacuum degree, cavitation often occurs when it operates in this area. The obvious sign of this phenomenon is that there is noise and vibration in the pump. Cavitation will cause damage to pump body, impeller and other parts, so that the pump can not work.

According to the above principles, when the vacuum degree or gas pressure required by the pump is not high, it can be selected in the single-stage pump preferentially. If the vacuum degree or exhaust pressure is high, the single-stage pump is often unable to meet the requirements, or the pump is required to have a large amount of air under a high vacuum degree, that is, the performance curve is required to be relatively flat under a high vacuum degree, so the two-stage pump can be selected. If the vacuum degree is required to be more than - 710mmhg, water ring atmospheric pump or water ring roots vacuum unit can be selected as the vacuum pumping device.

If it is only used for imported vacuum pump, it is better to choose single acting pump. Because the structure of single acting pump is simple, easy to manufacture and maintain, and it has good cavitation resistance under high vacuum. If it is only used for compressor with larger air volume, it is suitable to select double acting pump. Because of the large air volume, small volume and light weight of the double acting pump, the radial force can be automatically balanced, the shaft is not easy to produce fatigue fracture, and the service life of the pump is long.

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Selection of pumps for vacuum system

Considering what kind of vacuum pump is used in a vacuum system, first of all, according to the requirements of the system, second, we should have a detailed understanding of the performance characteristics of the pump, after comparing the advantages and disadvantages of various pumps, we can decide on it, so that we can choose the appropriate one.

1、 Oil seal mechanical pump

There are two-stage 2x Hokkaido rotary vane pump with a pumping speed of 0.5-150 L / s and a full range of products.

These pumps are used to obtain low vacuum, or as a high vacuum pump and pre pumping pump. With air ballast device, it can remove moist air. However, the limiting vacuum is one order of magnitude lower than that of dry air. The pumping speed of the pump refers to the pumping speed when the inlet pressure is 760 Torr. When the system pressure drops, the pumping speed also drops until it is close to the ultimate vacuum of the pump, and the pumping speed is also close to zero. The drawdown coefficient has certain regulations.


2、 Booster pump (roots pump)

The working pressure range is 10-5x10-4 Torr, the common range is 2-5x10-3 Torr, and the pumping speed range is 150-2000 L / s. there are a series of products in China. The maximum pumping speed of this kind of pump is between 2 ~ 10-2 Torr. It needs a front stage pump and can't exhaust directly to the atmosphere. The limiting vacuum varies with the preceding pump. Compared with the oil booster pump, it has a wider working pressure range, a higher maximum exhaust pressure (10-30 Torr for the mechanical booster pump, 1-2 Torr for the oil booster pump), and a small amount of reflux oil vapor, so it is more appropriate to use it to pump out condensable gases such as water vapor.

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Single screw pump

There are basically three types of screw pumps commonly used in the industry. They are divided according to the number of screws, namely, single screw pump, double screw pump and three screw pump. Then, let's see their characteristics and differences:

Single screw pump structure: the single head male screw rotor rotates eccentrically in the special double head female screw stator (the stator is soft), which can swing back and forth along the pump center line, and always keeps mesh with the stator.


Features of single screw pump:

1. It can transport liquid containing solid particles;

2. It can be used for almost any viscosity fluid, especially for high viscosity and non-Newtonian fluid;

3. The operating temperature is limited by the stator material.

Performance parameters: the flow rate can reach 150m3 / h, and the pressure can reach 20MPa.

Application of single screw pump: for molasses, pulp, starch paste, chocolate paste, paint, tar, paraffin, grease, mud, clay, clay, etc

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Stainless steel magnetic pump

The magnetic pump is made of stainless steel with reasonable design and advanced technology. It has the characteristics of full sealing, no leakage and corrosion resistance. Static seal is used instead of dynamic seal in stainless steel magnetic pump, which makes the overflow parts of the pump in a completely sealed state.

The magnetic pump is made of corrosion-resistant and high-strength engineering plastics, jadeite ceramics and stainless steel. Therefore, it has good corrosion resistance and can prevent the transported medium from pollution.

The main materials and uses of magnetic pump the magnetic pump has compact structure, beautiful appearance, small volume, low noise, reliable operation, convenient use and maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, national defense, scientific research institutions, metallurgy, dye and other units to pump acid, alkali, oil rare and precious liquid, venom, volatile liquid, as well as circulating water equipment supporting, filter supporting.

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Chemical pumps will help chemical production

A chemical pump is a machine that pressurizes and transports fluids. It changes the mechanical energy or other energy of the prime mover into liquid energy

In the chemical plant system, pumps are often used to transport, pressurize or return liquid materials such as raw materials, intermediate products and products. Therefore, pumps must have the characteristics of long-term, reliable, continuous and stable operation, high efficiency and low cost.

In the chemical industry, due to the different chemical production categories and process, the liquid delivered by the pump is very different. The corrosive range of these fluids ranges from non corrosive to strongly corrosive, such as hydrofluoric acid, concentrated alkali liquid, etc.; the viscosity range is from the liquid as thin as water to the high viscosity liquid of more than 100000 centipoises in the thick rubber industry, as well as the liquid containing suspended solids; there are non-toxic or highly toxic, highly volatile, flammable and explosive liquids; The temperature ranges from liquid hydrogen below the gas liquefying point of - 253 to thermal medium with a temperature of up to about 500, so there are many types of pumps.

Strictly speaking, chemical pump refers to the pump used to transport all kinds of liquid in the chemical process and the pump used to transport all kinds of chemical process liquid outside the process. In fact, the pumps used to transport industrial water and cooling water are not different from the pumps. Their main difference is that the chemical pumps often use special materials and designs to prevent corrosion and adapt to the characteristics of the chemical process.

Compared with water pumps, chemical pumps are much more complex in structure, shaft seal and pump materials. The technical difficulties and maintenance requirements of maintenance are much higher than those of ordinary pumps.

The normal operation of the pump is the key to ensure production. If the pump fails, it will affect production, or even cause half or full shutdown. Therefore, the maintenance and repair of the pump plays an extremely important role in the chemical production process.

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How to select horizontal centrifugal pump

Centrifugal pump is designed according to the principle of centrifugal force. The high-speed rotating impeller blades drive the water to rotate and throw out the water, so as to achieve the purpose of transportation. There are many kinds of centrifugal pumps, which can be divided into civil and industrial pumps from the use; from the transmission medium, they can be divided into clean water pump, impurity pump, corrosion-resistant pump, etc.

1、 The horizontal centrifugal pump with high efficiency, low noise and energy saving shall be selected, and it is strictly prohibited to choose out products.

2、 The motor voltage of horizontal centrifugal pump shall be the same, and the power supply system shall be the same as that of national grid.

3、 The pump shall be selected according to the design flow and the required head, and the pump output shall be reduced due to the abrasion of the pump. The pump can be selected by multiplying the calculated head h by the coefficient of 1.05-1.10. The characteristic curve shall be the pump whose head gradually decreases with the increase of the flow, so that the pump can work stably and reliably in parallel. The operation point of the pump shall be kept in the high-efficiency section for operation OK, it's energy-saving and not easy to damage the parts.

4、 When there is no regulating facility in the water supply network, it is better to use speed regulating pump group or rated speed pump group to run water supply. The maximum water output of the pump unit shall not be less than the design flow of water supply in the community, and shall be checked according to the fire fighting condition.

5、 The number of lifting pumps for water tank and water tower shall be minimized, one for use and one for standby; when a single pump can meet the requirements, multiple parallel connection mode shall not be adopted; if multiple parallel operation or matching mode of large and small pumps must be adopted, its model and number shall not be too many, and the model shall not be more than two generally, and the lift range of horizontal centrifugal pump shall be similar; each pump shall be in parallel operation The pump should still operate in the high efficiency area.

6、 The design water supply flow of the variable frequency speed regulating pump shall meet the requirements of the maximum design second flow in the domestic water supply system. The power supply shall be reliable; the working point of the water pump shall be selected in the efficient working area of the water pump characteristic curve, and shall not be selected on the extension line of the Q-H curve; the most unfavorable working point shall be designed at the right end of the efficient section of the water pump characteristic curve, that is, the point where the water output of the water pump is the largest and the lift is low, but it can meet the requirements, that is, the low point of the efficient section of the water pump characteristic curve and the pipeline characteristic curve The intersection of. The working range of water pump speed regulation shall be within the high efficiency section of water pump as far as possible; the speed regulation range shall be between 25% and 100% of water supply of water pump; the equipment shall have the function of automatic water level control.

7、 The water pump unit of the domestic pressurized water supply system shall be equipped with standby pump. The water supply capacity of the standby pump shall be greater than that of the largest operating water pump. The water pump shall be switched automatically and operated alternately

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