Three main reasons why diesel generator sets appear "touring cars"

The "travelling" of diesel generator sets is the result that the speed regulation response lags too far behind the actual speed change. The three main reasons are that the fuel supply rack is not flexible enough, the speed stabilization spring is not adjusted properly, and the internal lever of the governor is damaged due to the wear of the connecting pin hole. loose.

 

Diesel generator set "travel" refers to the phenomenon that the generator set has a long and regular period of fast and slow in the range of low speed and medium speed during the operation of the generator set. What is the reason for this?

 

Reason 1: The fuel supply rack of the diesel generator set is not flexible enough

 

The fuel supply rack of the fuel injection pump must remain absolutely flexible to ensure the sensitivity of the speed regulation response. Use a sensitive spring balance to test the pulling resistance of the gear rod, and the pulling resistance of the fuel injection pump corresponding to II, IV, VI and VIII cylinders should not be greater than 60, 90, 130, and 150g, respectively. Due to rust, deformation of the plunger couple after tightening, crushing of the engagement between the gear ring and the gear rod after the plunger spring is broken, serious wear of the shaft sleeve at the end of the gear rod, and the tightening angle of the fork of the fork-type oil volume adjustment mechanism Incorrect, the thrust swash plate and flying ball seat of the domestic fuel injection pump governor are installed or poorly matched, etc., which will affect the flexibility of the fuel supply rack. When this resistance, which affects flexibility, has not reached the point where the fuel supply rack cannot move at all, the phenomenon of "travelling" occurs.

 

Reason 2: Improper adjustment of the speed-stabilizing spring of the diesel generator set

 

This is similar to the improper adjustment of the speed-stabilizing spring when the idle speed is unstable. The reason why this situation is "travelling" is that the speed-stabilizing spring and the fuel supply rack cannot work together flexibly.

 

Reason 3: The internal lever of the diesel generator set governor is loose due to the wear of the connecting pin hole

 

In this case, the two-way speed control movement of increasing and decreasing the fuel supply produces too much lag in direction change. When the engine is working, the speed regulation response is bound to lag behind the actual speed change, but the lag cannot be too large, otherwise a large adjustment amplitude will occur. The adjustment amplitude is too large, that is, when the speed has been increased or decreased due to the increase or decrease of the fuel supply, the fuel will continue to increase or decrease the fuel until the speed exceeds the adjustment range of the governor, and its strong feedback signal will pass through the governor. The reaction of reverse regulation is realized, and the result is that the speed regulation response exceeds the predetermined range, resulting in the phenomenon of "travelling" in which the speed repeatedly rises and falls regularly around a certain value.

 

The occurrence of "travelling" in the diesel generator set is the result that the speed regulation response lags too far behind the actual speed change. When encountering this situation, the user should analyze the above three reasons, find out the problem, and solve the "symptom" in time, so as to make the The generator set operates normally.