Large liquid ring vacuum pump of influence factors of gas volume

The water consumption of large liquid ring vacuum pump is large, and the starting current is also relatively large, and the application conditions of this large vacuum pump are generally in the inspiratory occasions with large air volume, such as coal mine, wind test, coal washing, mineral processing, petrochemical, metallurgy, building materials and other industries, and the limit vacuum is rarely used. Air volume is the most important index of large vacuum pump. We add valve to adjust the air volume at the air inlet and use orifice flowmeter to measure the air volume. Shaft power is a very important performance parameter of large vacuum pump. It can intuitively show the operating condition of vacuum pump through current. The starting current of large vacuum pump is relatively large, so we need to know what to pay attention to in the process of experimental debugging.

Some precautions during commissioning and operation of large liquid ring vacuum pump:

First, the opening and closing state of the inlet valve;

During the commissioning and operation of large liquid ring vacuum pump, the inlet valve cannot be completely closed, so that the inlet valve is half open, otherwise no gas will enter, resulting in the water of liquid ring vacuum pump cannot be discharged in time, and the pump continues to supply water to the vacuum pump, so that the water will fill the vacuum pump cavity, and the liquid ring vacuum pump is used as a pump, resulting in motor overload.

Second, the size of water supply;

Before starting the vacuum pump, the water supply pipeline shall be opened and the overflow valve of the vacuum pump shall be opened at the same time. When there is water flowing out of the overflow valve, it indicates that the startup water level of the vacuum pump has been reached, the motor vacuum pump shall be started to operate, and the water supply valve shall be opened gradually at the same time. The water supply valve and the air inlet valve shall be adjusted according to the reading of the vacuum meter, so that the vacuum degree and the air suction capacity of the pumped system can meet the production requirements. During the operation of vacuum pump, pay attention to regulating the water supply valve and circulating water valve to keep the circulating water volume moderate. Attention should be paid to the water supply pipeline: Although the vacuum pump has self-priming capacity, the self-priming capacity of the large vacuum pump cannot meet the water supply requirements. A centrifugal pump must be added to the water supply pipeline to meet the water supply requirements of the vacuum pump. Without the centrifugal pump, the water supply capacity of the pump will be insufficient, and the direct connection will affect the formation of the vane ring in the vacuum pump, and there will be no sealed capacity between the two blades of the impeller In this case, it is obvious that no vacuum can be formed and no pumping can be carried out.

The third is to ensure the smooth exhaust of vacuum pump;

In order to work normally, the vacuum pump must realize two major balances: one is the balance of water, that is, the balance of water inlet and water outlet; the other is the balance of air, that is, the balance of suction and exhaust. To ensure the balance of gas, it is necessary to ensure the smooth exhaust channel. If the exhaust cannot be kept smooth or there is resistance in the exhaust, the current will rise instantaneously. In order to ensure the smooth exhaust of the vacuum pump, it is necessary to ensure that the size of the exhaust pipe and valve at the back is not less than the diameter of the exhaust port.

In addition, during the test and debugging, the exhaust pipe connected with the vacuum pump should be a certain distance from the ground, and it should not be too close to the ground, otherwise the exhaust will have resistance. If the exhaust pipe is too thin and the exhaust pipe is not smooth, the pressure in the exhaust pipe is too large, which is easy to cause system instability, vibration noise and even motor overload.

Large liquid ring vacuum pump of influence factors of gas volume