The inline pump is a kind of single-suction single-stage centrifugal pump. It is a vertical structure. Because its inlet and outlet are on the same line, and the inlet and outlet are the same diameter, it looks like a section of pipeline. It can be installed in any position of the pipeline. Pump (also known as booster pump).
Structural features: Single-stage single-stage centrifugal pump, the inlet and outlet are the same and on the same line, and the shaft center line is orthogonal, which is a vertical pump.
A. The basic structure of a inline centrifugal pump is composed of six parts.
The basic structure of the pipeline centrifugal pump is composed of six parts: impeller, pump body, pump shaft, bearing, sealing ring and stuffing box.
1. The impeller is the core part of the centrifugal pump. Its high speed is high, and the blades on the impeller play a major role. The impeller must pass the static balance test before assembly. The inner and outer surfaces of the impeller are required to be smooth to reduce the frictional loss of water flow.
2. The pump body is also called the pump casing, it is the main body of the pump. It supports the fixing and is connected to the GD stainless steel pipe pump [1] bracket on which the bearing is mounted.
3. The function of the pump shaft is to connect the coupling to the motor and transfer the torque of the motor to the impeller, so it is the main component that transmits mechanical energy.
4. The bearing is a member that supports the pump shaft on the pump shaft, and has two kinds of rolling bearings and sliding bearings. Rolling bearings use butter as a lubricant to refuel properly. Generally 2/3~3/4 of the volume will heat too much, too little and there will be noise and heat! The sliding bearing uses transparent oil as the lubricant, refueling to the oil level line. Too much oil will ooze along the pump shaft and float. Too few bearings will overheat and burn out. The temperature of the bearing is up to 85 degrees during the operation of the pump. Generally, it is about 60 degrees. If it is high, it is necessary to find the cause. (Is there any impurities, whether the oil is black or not, whether it is in the water) and deal with it in time.
5. The seal ring is also known as the leak reduction ring. The gap between the impeller inlet and the pump casing is too large, so that the water in the high pressure zone of the pump flows to the low pressure zone through the gap, which affects the water output of the pump and reduces the efficiency. If the clearance is too small, the friction between the impeller and the pump casing may cause friction. In order to increase the backflow resistance and reduce the internal leakage, and delay the service life of the impeller and the pump casing, a sealing ring is arranged at the inner edge of the pump casing and the outer joint of the impeller, and the sealing gap is preferably maintained between 0.25 and 1.10 mm.
6. The stuffing box is mainly composed of packing, water sealing ring, packing tube, packing gland and water sealing tube. The function of the stuffing box is mainly to close the gap between the pump casing and the pump shaft, so that the water in the pump does not flow to the outside and the outside air does not enter the pump. Always keep the vacuum inside the pump! When the pump shaft and the packing friction generate heat, the water should be sealed to the water seal ring to cool the packing! Keep the pump running normally. Therefore, it is especially important to check the stuffing box during the running inspection of the pump! The packing should be replaced after about 600 hours of operation.
B. Overcurrent components of the centrifugal pump
The overcurrent components of the centrifugal pump include: a suction chamber, an impeller, and an extrusion chamber. The impeller chamber is the heart of the pump and the core of the flow components. The pump works by the impeller on the liquid to increase its energy. The impeller is divided into three categories according to the direction in which the liquid flows out:
(1) The radial flow impeller (centrifugal impeller) liquid flows out of the impeller in a direction perpendicular to the axis.
(2) The oblique flow impeller (mixed flow impeller) liquid flows out of the impeller in a direction inclined along the axis.
(3) The axial flow impeller liquid flows in a direction parallel to the axis.
C. How the centrifugal pump works
The working principle of the centrifugal pump is: the centrifugal pump can send water out due to the centrifugal force.
Before the pump is working, the pump body and the inlet pipe must be filled with water to form a vacuum state. When the impeller rotates rapidly, the blade causes the water to rotate quickly. The rotating water flies from the impeller under the action of centrifugal force, and the water in the pump After being thrown, the central portion of the impeller forms a vacuum region. The water of the water source is pressed into the water inlet pipe through the pipe network under the action of atmospheric pressure (or water pressure).
This cycle is not enough, you can achieve continuous pumping. It is worth mentioning here: before the centrifugal pump starts, it must be filled with water in the pump casing before it can be started. Otherwise, the pump body will be heated, vibrated, the water output will be reduced, and the pump will be damaged (referred to as “cavitation”). Causing equipment accidents!There are many types of centrifugal pumps, and the following methods are common in the classification methods.
1 According to the impeller suction method: single-suction centrifugal pump Double-suction centrifugal pump.
2 According to the number of impellers: single-stage centrifugal pump and multi-stage centrifugal pump.
3 According to the structure of the impeller: open impeller centrifugal pump semi-open impeller centrifugal pump closed impeller centrifugal pump.
4 according to the working pressure: low pressure centrifugal pump medium pressure centrifugal pump high pressure centrifugal pump.
