Serial communication issues

It refers to the amount of movement of the rotor. This can be determined using a stopwatch: first, move the rotor to one end, record the time, zero the stopwatch, and then move the rotor to the other end

The term \"series clearance\" generally refers to the series clearance of multi-stage pumps and pumps with dual supports. 1. What is series clearance? After the pump is assembled, without installing a balance disk, the rotor is connected into a rigid body using nuts. First, the rotor is pushed in the suction direction so that the inlet ring of the impeller is in close contact with the outlet ring of the pump body; then the rotor is pulled toward the discharge side so that the rear cover of the impeller is in close contact with the guide vanes. The sum of the gaps on the left and right sides is what is known as the pump’s series clearance. 2. Adjustment of the pump’s series clearance: During operation, if the center of the impeller and the center of the guide vanes are not aligned, the pump will deviate from its optimal operating condition, resulting in a significant decrease in efficiency. This is typically manifested by a reduction in flow rate and an increase in head, meaning that the operating point shifts in the direction of the axial force, leading to increased power consumption. If this situation is allowed to continue, vibration increases and wear becomes severe. Therefore, it is necessary to select a series clearance value that requires minimal maintenance and results in low power consumption, so as to ensure high efficiency in pump operation. Based on practical experience, the series clearance value is usually chosen to be the middle value of the total series clearance. The value without a balance disk is referred to as the total series clearance, while the value with a balance disk is called the partial series clearance. Generally, the partial series clearance is half of the total series clearance. A balance disk is first used to determine the initial position, and the precise adjustment is made by adjusting the position of the positioning bearings to set the final value of the partial series clearance

Taking a compressor as an example: Place the rotor on the radial bearings of the cylinder block and use an axial gauge; first push the rotor to one end, adjust the gauge reading, then push the rotor to the other end – the resulting value represents the total axial displacement of the rotor； Push the rotor to the intermediate positioning position, install the main thrust bearing, and measure the series quantity as half a series quantity ； When installing the secondary thrust bearing and measuring the clearance of the thrust bearing, it should meet the standard values. The value of each series should be greater than the thermal expansion elongation generated during the operation of the corresponding rotor; otherwise, friction will occur between the moving and stationary parts of the equipment, leading to damage to it.

Axial displacement is divided into rotor axial displacement and partial axial displacement; rotor axial displacement refers to the total amount of axial movement the rotor can make within the casing； The lateral displacement refers to the displacement of the rotor relative to the thrust bearings or balance discs; this is the actual displacement that occurs during the operation of the rotor ； For single-stage small pumps, the play refers to the sum of the gap between the bearing cover and the bearing within the bearing housing and the bearing’s own clearance ； Displacement is very important for the equipment, as it determines the position of the rotor during operation! Adjusting its quality is also an important parameter that determines the operating temperature of the equipment.