Precautions for using water circulation pump

Precautions for using water circulation pump

1. Purpose and scope of use

SK series water circulation vacuum pumps and compressors are used to suck or pressurize gases and other corrosive, water-insoluble and solid particles-free gases, so as to form a vacuum or pressure in a sealed container to meet the process requirements. A small amount of liquid is allowed to be mixed in the inhaled or compressed gas.

SK series water circulation pumps and compressors are widely used in machinery, petroleum, chemical, pharmaceutical, food, ceramics, sugar, printing and dyeing, metallurgy and electronics industries.

Since this type of pump compresses gas in an isothermal state during the working process, it is not prone to danger when pumping or pumping flammable and explosive gas, so its application is more extensive.

2. Working principle

As shown in Figure (1), the impeller 3 is eccentrically installed in the pump body 2, and a certain high temperature water is injected into the pump when the pump is started. Therefore, when the impeller 3 rotates, the water is subjected to centrifugal force to form a swirling water on the inner wall of the pump body. Ring 5, the upper inner surface of the water ring is tangent to the hub and rotates in the direction of the arrow. During the first half of the revolution, the inner surface of the water ring separates from the hub, so a closed space is formed between the impeller blades and the water ring. As the impeller rotates, the The space gradually expands, the compression of the space gas decreases, and the gas is sucked into the space. During the second half of the revolution, the inner surface of the water ring gradually approaches the hub, the space between the blades gradually shrinks, and the space gas pressure rises above the exhaust port pressure. , The air between the blades is discharged. In this way, every time the impeller is transported for a week, the space between the blades is sucked and exhausted once, and many spaces work continuously, and the pump continuously sucks and presses the gas.

During the working process, the heat generated by the work will cause the working water ring to heat up, and part of the water and gas will be discharged together. Therefore, during the working process, the pump must be continuously supplied with water to cool and supplement the water consumed in the pump. , Meet the working requirements of the pump.

When the gas discharged by the pump is no longer used, a water separator is connected to the exhaust end of the pump (you can make a water tank yourself instead). After the exhaust gas and part of the water are discharged into the gas-water separator, the gas and water are separated. The exhaust pipe is discharged, and the remaining water is supplied to the pump through the return pipe for continued use. With the extension of working time, the working temperature will continue to rise. At this time, a certain amount of cold water (tap water) needs to be supplied from the water supply of the steam separator , The temperature of the working water is reduced to ensure that the pump can meet the requirements and performance indicators.

When used as a compressor, the exhaust port of the pump is connected with steam-water separation steam. The steam-water mixture enters the water separator and is automatically separated. The gas is delivered to the required system through the exhaust pipe, and the working water is discharged through the automatic overflow switch. , The working water is very easy to generate heat, and the water is discharged from the pump outlet, and the temperature will become higher. Therefore, at the bottom of the steam separator, cold water should be continuously supplied to supplement the released hot water, and at the same time, it has a cooling effect to make the work The water temperature should not be too high, so as to ensure the performance of the compressor, reach the technical indicators and meet the technological requirements. 

3, structure description

The structure of the pump is shown in Figure 2 and Figure 4

The pump is composed of pump body, two end covers, impeller and other parts. The intake pipe and the exhaust pipe are connected with the pump through the suction hole and the exhaust hole on the disc installed on the end cover, and the impeller is eccentrically installed in the pump body. The total gap at both ends of the pump is adjusted by the pad between the pump body and the disc. The gap between the discs on the impeller segment cover is adjusted by the shaft sleeve (SK-3/6) or the back cap (SK-9/12) Push the impeller to adjust. The gap between the two ends of the impeller and the end cover disc determines the size of the loss and the ultimate pressure of the gas in the pump cavity from the inlet to the outlet.

The packing is installed in the end caps, and the sealing water enters the packing through the small holes of the end caps, cooling the packing and strengthening the sealing effect. The supplementary water required by the impeller to form a water ring is supplied by the water supply pipe, which can also be connected with the steam-water separator to circulate water.

When the mechanical seal is adopted as the sealing form, the mechanical seal is installed in the packing cavity, the packing is omitted, the packing gland is replaced with a mechanical seal gland, and the rest of the structure is the same.

The bearing is fixed on the shaft by a round nut.

A disc is installed on the end cover, and the disc is provided with suction and exhaust holes and rubber ball valves. The function of the rubber ball valve is to discharge the gas before the exhaust port when the gas pressure between the impeller blades reaches the exhaust pressure, reducing the power consumption due to excessive gas pressure and reducing power consumption.

4, Equipment description

The SK series water circulation vacuum pump and compressor system is composed of vacuum pump (compressor), coupling, electric motor, steam-water separator and pipeline.

The working process of the vacuum pump and compressor and the steam-water separator is as follows: the gas discharge pipeline enters the vacuum pump or compressor through the valve, and then is discharged into the steam-water separator through the air guide elbow, and discharged through the steam-water separator exhaust pipe. When used as a compressor, after the gas-water mixture discharged by the compressor is separated in the steam-water separator, the gas is sent to the gas system requiring pressure compression through the valve, while the water stays in the steam-water separator to separate the steam and water The water level of the device is kept constant and an automatic overflow switch is installed. When the water level is higher than the required water level, the overflow switch opens and the water overflows from the overflow pipe. When the water level is lower than the required water level, the overflow switch closes and the water level in the soda separator rises. Reach the required water level. The working water in the vacuum pump or compressor is supplied by a steam-water separator (tap water can also be used), and the amount of water supplied is adjusted by a valve on the water supply pipe.

The difference between gas suction and pressure delivery systems lies in the internal structure of the steam-water separator. When sucking gas, the pressure at the suction port is lower than the atmospheric pressure, and the pressure at the exhaust port is equal to the atmospheric pressure. The steam-water separator has only an overflow pipe. When the gas is compressed, the suction port is at normal pressure (it can also be in a vacuum state), and the exhaust port The pressure is higher than one atmosphere; in order to ensure the delivery gas pressure, the water level of the steam-water separator is controlled by an overflow switch.