SK-Z direct water ring vacuum pump

Model Meaning

Purpose and scope of use
SK direct coupled water ring vacuum pumps SK-0.4, SK-0.8, SK-1.0, and SK-1.5B are used to suction air and other non corrosive, insoluble, and solid particle free gases to create a vacuum in a closed container. A small amount of liquid is allowed in the inhaled gas.
SK type direct coupled water ring vacuum pump is widely used in industries such as machinery, petroleum, chemical, pharmaceutical, food, ceramic printing and dyeing, metallurgy, etc. It is also particularly suitable for large-scale water pump water intake.
Due to the isothermal compression of gas during the working process, it is less prone to danger when extracting corrosive, flammable, and explosive gases, making it more widely used.

working principle

Figure 1
	1	impeller
	2	pump body
	3	water ring
	4	air intake hole
	5	vent hole
	6	Rubber ball valve
As shown in Figure (1), the impeller is eccentrically installed inside the pump body. When the pump is started, a certain height of water is injected into the pump. When the impeller rotates, the water is subjected to centrifugal force and forms a rotating water ring on the inner wall of the pump body. The lower inner surface of the water ring is tangent to the hub. When rotating in the direction of the arrow, during the first half of the rotation, the inner surface of the water ring gradually separates from the hub, forming a space between the blades and gradually expanding. The internal pressure is lower than the inlet pressure, and gas is sucked in at this time. During the latter half of the rotation, the inner surface of the water ring gradually approaches the hub, and the volume of space between the blades decreases. When the gas pressure is higher than atmospheric pressure, it is discharged. In this way, the impeller works repeatedly, and the SK direct coupled water ring vacuum pump continuously sucks in gas. Due to the fact that water will generate heat over time during operation, and some of the water will be discharged along with gas, it is necessary to continuously supply cold water to the pump during operation to cool and replenish the water consumed in the pump. When the gas discharged by the pump is exhaust gas, a water tank can be connected to the exhaust end. After the exhaust gas and a part of the water carried out are discharged into the water tank, the gas is discharged through the exhaust pipe of the water tank, and the water falls into the bottom of the water tank and returns to the pump for use through the return pipe. If the water circulation time is long and the water heats up, then supply a certain amount of cold energy from the water tank supply.

Structural Description

Figure 2
	1	pump cover	8	motor
	2	impeller	9	axis
	3	disc	10	flat key
	4	Inlet and exhaust flange	11	plug
	5	filler	12	faucet
	6	gland	13	chassis
	7	pump body
The structure of SK direct coupled water ring vacuum pump is shown in Figure 2: mainly composed of pump cover, impeller, and pump body. The upper part of the pump body has inlet and outlet flanges, and the shaft is eccentrically installed in the pump body. The impeller is fixed to the shaft with a flat key. The gap between the impeller, pump cover, and disc is adjusted by the cushion between the pump body and disc. This gap determines the size of gas loss in the flow from the inlet to the outlet in the pump. The packing is installed inside the pump body, and the sealing water flows into the packing through the pinhole on the pump body. The supplementary water required for the impeller to form a water ring is supplied through the elbow on the pump body, which can be connected with tap water or soda water separator to supply circulating water. There are several rows of circular holes under the exhaust holes on the disc, which are closed with rubber ball valves. The purpose of these holes is to automatically release gas before the exhaust port when the gas pressure between the blades reaches the exhaust force, thereby reducing power consumption due to excessive gas pressure.

technical specifications

Usage and maintenance instructions
1. Before starting the vacuum pump, it is necessary to check whether the rotation direction of the motor matches that of the pump. After starting the vacuum pump, adjust the size of the water inlet, and then check whether the packing is properly compressed (normal packing compression can make the water in the pump drip outwards). SK-1.5B should first add water before starting the vacuum pump, and then adjust the size of the water inlet. Check whether the bearing operation and lubrication are normal.
2. After starting the vacuum pump, it is necessary to observe whether there is vibration, listen carefully for any noise inside the pump, and measure the temperature of the packing box and bearings (the normal bearing temperature should not be higher than the ambient temperature by 35 ℃, and the working temperature should not be higher than 70 ℃). If the temperature is too high, the machine should be stopped immediately to check the cause.
3. When a vacuum pump is used as a water pump for vacuum water intake, it sucks out all the air inside the water pump during operation until water is sucked out from the pump. Then, the water pump is started. After the water pump is working normally, the vacuum pump is stopped and the valve in the suction pipeline is closed.
4. Vacuum pump shutdown sequence
(1) Close the gate valve on the intake pipeline
(2) Close the gate valve on the water supply pipeline. It is not advisable to stop the pump immediately after stopping the water supply. The pump should continue to run for 1-2 minutes to discharge some working fluid. Mechanical seals should first stop the pump and then stop the water supply.
(3) Turn off the electric motor.
(4) If the parking time exceeds one day, the screw plug at the bottom of the pump cover must be opened to drain the water from the pump body.
5. When the pump is used under the following conditions, auxiliary equipment should be added.
(1) The defendant must install a filter on the intake pipe to remove dust from the air or gas.
(2) When the extracted gas contains a large amount of vapor, a condenser must be installed on the intake pipe.
(3) When extracting corrosive gases, neutralization must be carried out before entering the pump.
(4) When the temperature of the extracted gas exceeds 35 ℃, it must pass through a condensing device before entering the pump to ensure that the temperature does not exceed 35 ℃.
(5) When the extracted gas contains a large amount of liquid, a steam water separator must be installed in front of the intake pipe.
(6) The starting current of a pump is often several times the rated current of the motor, and a starting switch must be used.
Note: ① Our products may be changed without prior notice due to technological improvements or other reasons.
② Our products are not allowed to be disassembled without the permission of our company during the warranty period.