Knowledge of water temperature performance of water ring vacuum pump

The following vacuum pump factory introduces the water temperature performance of water ring vacuum pump, hoping to help you.

The water temperature of the water ring vacuum pump has a great influence on its performance, and the performance curves of the water ring vacuum pump are all measured under the water temperature of 15 ℃. Therefore, the pumping rate of the water ring vacuum pump should be modified when the water ring vacuum pump is actually selected.

The actual pumping speed of water ring pump can be calculated according to QT = q15k, k = (P1 PT) / (p1-p15), where:

1. QT - air volume at t ℃ (m3 / min) Q15 - air volume at 15 ℃ (m3 / min).

2. P1 - suction pressure of water ring pump mmHg Pt - saturated steam pressure mmHg at t ℃.

3. P15 - saturated steam pressure mmHg K at water temperature of 15 ℃ - gas volume correction coefficient.

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Method of reducing crankshaft wear of dry vacuum pump

Method of reducing crankshaft wear of dry vacuum pump

Crankshaft is an important part of engine. It receives the force from the connecting rod and converts it into torque output through the crankshaft and drives other accessories on the engine. If the crankshaft is seriously worn, the normal operation of the machine will be affected. Similarly, if the crankshaft of the dry vacuum pump is worn, it will not only affect the normal operation, but also cause danger. How can we reduce the wear and tear?


The surface wear of Crankshaft Journal of dry vacuum pump is uneven. The radial wear of main journal and connecting rod journal is mainly elliptical, and the wear parts correspond to each other, that is, the wear part of each main journal is close to the side of connecting rod journal; the wear part of connecting rod journal is also close to the side of main journal. The elliptical wear of crankshaft journal is caused by the uneven distribution of the force acting on the journal along the circumference.

When the engine is working, the general force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the crankshaft radius, so the inner side of the connecting rod journal is worn greatly, forming an ellipse. The reason for the wear of the connecting rod journal of the dry vacuum pump is that the oil passage leading to the connecting rod journal is inclined. Under the action of centrifugal force, the mechanical impurities in the lubricating oil tend to accumulate on one side of the connecting rod journal, making the wear of the connecting rod journal tapered.

There may also be scratches and burns on the surface of the journal when it is used. The abrasion is mainly caused by the unclean engine oil, during which the larger consolidation mechanical impurities are scratched on the surface of the journal. The burn on the surface of the journal is caused by the burning of the bearing, which is mainly caused by the thin oil and other reasons.

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How to solve the overload of Roots vacuum pump

The power required by roots vacuum pump to compress gas is directly proportional to the pressure difference. Once the gas pressure difference is too high, the pump may be overloaded and the motor winding may be burnt. There are several ways to deal with the problem of pump overload: select mechanical active pressure regulating bypass valve. The bypass valve is installed on the bypass pipe between the outlet and inlet of Roots vacuum pump.

This valve operates the differential pressure between the pump inlet and the pump outlet without exceeding the additional value. When the pressure difference reaches the extra value, the valve will open actively by the effect of pressure difference, so that the outlet of Roots vacuum pump is connected with the inlet, so that the pressure difference between the inlet and the outlet drops rapidly. At this time, roots vacuum pump operates under the load without pressure difference. When the pressure difference is lower than the additional value, the valve is actively closed, and the gas is pumped out by the front stage pump through the roots vacuum pump.

The roots vacuum pump with bypass overflow valve can be started together with the previous pump, which makes the operation of the unit simple and convenient. The selection of hydraulic coupling can also avoid overload of the pump, so that the pump can operate under high pressure difference. The hydraulic coupling is installed between the pump and the motor. In normal operation, the hydraulic coupling transmits additional torque from the motor end to the pump.

The maximum pressure difference of Roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, while the maximum torque transmitted by the hydraulic coupling is regulated by the amount of liquid in between. When the pump works under high pressure difference or starts together with the front pump, there is a speed difference in the liquid coupling, that is, sliding, which only transmits a certain moment to slow down the pump. With the pumping process, the gas load is reduced, and the roots vacuum pump is gradually accelerated to an additional speed.

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How to disassemble liquid ring vacuum pump

Liquid ring vacuum pump can be divided into single stage and double stage, and the difference between single effect and double effect. The single-stage and double-stage vacuum pumps refer to the stages of their impellers; the single / double effect refers to the way of their impellers / casings. The impellers of the single effect impeller vacuum pump rotate once and experience one suction / discharge of gas; the impellers of the double effect vacuum pump rotate once and experience two suction and discharge of gas.

All parts of the liquid ring vacuum pump shall be completely cleaned in the process of repair. The specific steps of disassembly and assembly are as follows: unscrew and remove the screws, and remove the diaphragm of the liquid ring vacuum pump cover and O-ring assembly along the axial direction. Generally, it is not necessary to remove the diaphragm from the pump cover, but if it is necessary to replace the diaphragm, clean or replace the valve plate, or if the cavitation maintenance pipe and O-ring are dropped, the diaphragm shall be removed from the pump cover.

When the diaphragm is disassembled from the pump cover, it can be pierced into a Φ 12M, l = 140mm round rod from the emptying port of the liquid ring vacuum pump cover. After the diaphragm is removed, the valve plate baffle, valve plate and cavitation maintenance pipe can be removed from the disc. Unscrew the bolts and remove the pump cover, diaphragm and O-ring together.

Screw out the screw, take out the impeller pressing plate and adjusting washer, pull out the impeller through pulling force, and remove the flat key from the main shaft. Remove the mechanical seal. In order to remove the mechanical seal more simply, the motor shaft before the mechanical seal can be coated with water and smooth (rubber bellows seal prevents oil or grease from being smooth). If there are calcifications such as scale on the electric shaft, the mechanical seal shall be removed after it is cleaned, otherwise the mechanical seal will be damaged simply.

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What is the vacuum degree of water ring vacuum pump

In theory, vacuum means that there is no substance in the volume. Usually, the pressure in the container is lower than the normal atmospheric pressure (101325pa), which is called the vacuum state. Many people don't understand the vacuum degree of water ring vacuum pump, so follow this article to understand it.

Vacuum degree refers to the thinness of gas in vacuum state, usually expressed by pressure value. The value of vacuum degree indicates that the actual value of the system pressure is lower than the atmospheric pressure. The value expressed from the table is also called the table pressure, which is also called the limit relative pressure in the industry. In practical application, the vacuum degree usually has two expressions: absolute vacuum and relative vacuum. The value read from the vacuum gauge is called vacuum degree. Vacuum degree = atmospheric pressure - absolute pressure (atmospheric pressure is generally 101325pa, and the ultimate absolute pressure of water ring vacuum pump is 3300pa; the ultimate absolute pressure of rotary vane water ring vacuum pump is about 10Pa)

The relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. Because the air inside the container is pumped, the internal pressure is always lower than the external pressure of the container. When expressed in terms of relative pressure or gauge pressure, the value must be preceded by a minus sign, indicating that the internal pressure of the container is lower than the external pressure.

The absolute pressure is how much higher the measured internal pressure is than the theoretical vacuum (the theoretical vacuum pressure value is 0Pa). The object of comparison is the absolute vacuum pressure value of theoretical state. Due to the limitation of technology, we can not pump the internal pressure to the absolute vacuum value of 0Pa in any case. The vacuum value of water ring vacuum pump is higher than the theoretical vacuum value. So when we use absolute vacuum, there is no minus sign in front of the value.

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Selection of Roots vacuum unit

Selection of Roots vacuum unit

It is very important to choose the pumping speed ratio of vacuum unit and vacuum pump. Next, I will briefly talk about the precautions for the selection of Roots vacuum unit.

Because the compression ratio of vacuum pump is very limited. This compression ratio determines the capacity of the previous pump, because the compression ratio is the inverse ratio of the pumping speed of the two pumps. Generally, the compression ratio is selected within 2-10. In addition, we should consider the requirements of pre pumping time. Vacuum equipment is used as auxiliary equipment in all kinds of mechanical equipment. If the normal working time is much longer than the pre pumping time, a smaller front pump can be selected (the compression ratio can be larger), if the vacuum is larger. Moreover, it is required to pre pump soon, so a larger pre pump is used.

Sometimes, in order to give full play to the efficiency of the equipment, a larger pre pumping pump is installed in front of the unit, which is stopped after normal operation, and maintained by a smaller pre pump, so as to save power. The requirements for the ultimate pressure of Roots vacuum pump unit are also necessary to be considered when selecting the front stage pump. The high requirements for the ultimate vacuum degree (up to 1 × 10-3pa ~ 1 × 10-2Pa pressure) generally select the two-stage rotary vane oil seal mechanical pump or two-stage sliding Yan mechanical pump as the front stage pump.

The mechanical pump with single-stage oil seal can be used as the front pump when the limit vacuum is between (1 × 10-2Pa ~ 1 × 10-1pa), and the reciprocating vacuum pump or liquid ring vacuum pump can be used as the front pump when the limit vacuum is between 133 ~ 1333pa. In order to obtain a high pumping rate at a low inlet pressure (1-100pa), a Roots vacuum pump can be used as a three-stage or four-stage unit composed of a front stage pump of another roots vacuum pump. At this time, the pumping ratio between roots vacuum pumps is generally between 2 and 5.

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Factors affecting sealing effect of water ring vacuum pump

When we use the water ring vacuum pump, sometimes the sealing effect will decline. How can we deal with this situation? To solve the problem, we first need to understand the reasons for this situation. The following article explains the factors that affect the sealing effect of water ring vacuum pump in detail. Let's take a look at them.

1. The biological slime of the water ring vacuum pump fills the gap of the tension spring day by day, which affects the compensation effect of the tension spring in the seal, also intensifies the wear of the dynamic and static ring conflict pairs, and affects the sealing effect of the auxiliary sealing ring. The presentation of this situation requires us to carry out the vacuum pump cleaning regularly.

2. It is inevitable that the working fluid (containing calcium ion) of water ring vacuum pump and the calcium carbonate generated by the reaction of carbon dioxide in the compressed medium will damage the mechanical seal, but we can carry out regular protection to minimize this problem.

3. The corrosion of the metal parts of the whole mechanical seal body caused by the induction effect of the isooxybacteria, biological slime, calcium ions and related chemicals contained in the working fluid seriously affects the sealing effect and application time of the mechanical seal.

4. Although most of the dust in the upstream adsorbent is removed through selection and other steps during loading, with the increase of operation time and the flushing of medium air flow, new dust will be generated more or less, and the dust entering the water ring vacuum pump may enter the sealing position of the machine seal at any time, causing damage to it, so we need to carry out regular maintenance and cleaning.

5. The slow corrosion of the added relevant chemicals to the sealing ring of the water ring vacuum pump will cause the sealing failure. In fact, prior to the selection of chemical reagents for use, the experienced manufacturers will select chemicals with less corrosiveness or even without.

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