Circulating Water Vacuum Pump

A circulating water vacuum pump also called a water ring vacuum pump, is a kind of pumping vacuum pump. The ultimate vacuum it can obtain is 2000-4000 Pa, and the series atmospheric ejector can reach 270-670 Pa. The water ring pump can also be used as a compressor, called a water ring compressor, which is a low-pressure compressor with a pressure range of 1-2X105 Pa table pressure.

Circulating Water Vacuum Pump Working Theory

Its working medium is water. The vacuum pumping principle of the circulating water vacuum pump is different from that of jet pumping. It is still a centrifugal mechanical pump. The impeller rotor is eccentrically installed in the cylindrical pump casing. Its vane is forward-curved. When the impeller rotates. Working water in the centrifugal force under the action of the formation of the water ring along the pump casing rotary flow. Because of the impeller's eccentric position. Water ring relative to the vane for relative operation. So that the space between the adjacent two blades' volume is cyclically changing. Like a liquid "piston" in the leaf grid for radial reciprocating operation. For example, located in the blade from the top right rotation to the bottom. Between every two blades of the water piston" will be centrifugal to push outward. Make this space volume from small gradually become larger. To the lowermost when the maximum. So from the axial suction port 4 to suck in the gas. And when the blade is from the bottom to the upper left in the process of rotation. The "water piston" is the direction of the axis for relative movement. The space between the two blades righteousness gradually from large to small. So the inhaled gas is gradually compressed. Discharge through the exhaust port 6. With the stable rotation of the impeller. Each volume wheel repeatedly changes. So that the suction and exhaust process continues.

The working water of the circulating water vacuum pump is discharged together with the compressed gas. Therefore, the water ring needs to be continuously replenished with new cold water. In order to maintain a stable water ring thickness and temperature. In addition to the "liquid piston" role of the water ring. There is also heat dissipation (for the compression process). Seal (between the impeller and air distribution plate) cooling (shaft seal) and other roles. Therefore, the working speed of the pump (corresponding to a certain thickness of the water ring), the actual working water temperature, and the air distribution hole arrangement are the main factors affecting the pump. The pumping volume, working efficiency, and compression ratio (including the achievable vacuum degree) play a decisive role.

The water circulating vacuum pump produced by LACHOI company can start and stop automatically at any time according to the change of system vacuum. When the system vacuum decreases to 10kPa100mbar more than the set value, the unit is equipped with three circulating water vacuum pumps. One or two sets are used in normal operation. Each of them is 10U% capacity. If one pump is in operation, the other pump is on automatic standby. Then the pressure switch makes the standby pump stop so that the pumping pressure is guaranteed to operate within the specified range.

Circulating Water Vacuum Pump Usage Method

(1)Preparation. Put the circulating water vacuum pump flat on the working table, when it is used for the first time, open the top cover of the water tank and inject clean cool water (water can also be added through the water hose), stop adding water when the water surface is about to rise to the height under the overflow nozzle at the back of the water tank, repeatedly turn on the machine without adding water. Replace the water at least once a week, such as water pollution, the use of high, it is necessary to shorten the time to replace the water to keep the water in the tank clean.

(2)Evacuation Operation, Connect the pumping sleeve of the equipment to be vacuumed closely to the pumping nozzle of the machine, close the circulating switch, turn on the power supply, turn on the power switch, and start the vacuuming operation, the vacuum degree can be observed through the vacuum meter corresponding to the pumping nozzle.

(3)When the circulating water multi-purpose vacuum pump needs to work continuously for a long time, the water temperature in the water tank will rise and affect the vacuum degree, at this time, the water discharge hose can be connected with the water source (tap water) and the overflow nozzle can be used as the drainage outlet to control the tap water flow appropriately, which can keep the water temperature in the water tank from rising and make the vacuum degree stable.

(4)When it is necessary to provide cooling circulating water for the reaction device, on the basis of the previous operation in Article 3, connect the water inlet and outlet pipes of the device to be cooled to the circulating water outlet and inlet nozzles at the rear of the machine respectively, and turn the circulating water switch to the ON position to realize circulating cooling water supply.

The above is the information related to the working theory and usage method of circulating water vacuum pumps, we hope it will be helpful to you.