When the air pressure in the air reservoir decreases
Normally, the rate of operation of the air compressor is approximately 30%; however, it changes to approximately20-40% depending on the conditions described above. Despite the high or low air consumption, the operation of the air compressor in the prior art is always operated at the rated level (full operation), so that, in some cases, it can cause vibration of the car body and potential discomfort to the passengers. At the same time, the vibration of the compressor itself is significant, so thatthe piston rings or ball bearings will generally wear out rapidly. In addition, the frequency of starting and stopping of the compressor is high and its start-up current is high, so that electrical power consumption increases; furthermore, the principalcontactor rapidly experiences wear, and the compressor starting device consisting of the principal contactor, the series resistor and breaker, becomes quite large.
The system includes an air compressor 1, and air reservoir 2, a check valve 3, in which the forward direction is the direction of the air reservoir 2. An air adjustment device 4 is provided which detects the airpressure P in the air reservoir 2. In this prior art air supply system, the driving device 5 starts and stops the air compressor 1 depending on the electrical signal coming from the pressure adjustment device 4.
the system includes an air compressor 1, and air reservoir 2, a check valve 3, in which the forward direction is the direction of the air reservoir 2. An air adjustment device 4 is provided which detects the airpressure P in the air reservoir 2. In this prior art air supply system, the driving device 5 starts and stops the air compressor 1 depending on the electrical signal coming from the pressure adjustment device 4.
When the air pressure in the air reservoir decreases and reachesthe first standard value, the air compressor is driven at low speed, that is, at a lower number of revolutions than the rated number of revolutions, and when the air pressure in the air reservoir increases as a result of the low speed operation andreaches the upper limit set point the air compressor is turned off.
After that, the air pressure P decreases due to the air consumption by the pneumatic equipment, and whenit becomes less than the lower limit set point P1 at time t12, the pressure adjustment device 4 detects this condition, and the air compressor 1 is once again operated at its rated capacity. Thus, by starting and stopping the air compressor 1, the airpressure P in the original air reservoir 2 is adjusted between the lower limit set point P1 and the upper limit set point P4.
When this air pressure decreases and becomes less than the lower limit set point, the air compressor is driven at the rated operating speed, and when the air pressure in the airreservoir increases by this rated operating speed and reaches the second standard value, the air compressor is once again driven at low speed. Such a pressure adjustment method for a railway car is particularly useful when the air pressure in the airreservoir which is connected to the air pressure machinery such as the air brake system, etc., increases, and reaches the upper limit set point, the air compressor is turned off, and when this air pressure decreases and becomes less than the lower limitset point, the air compressir is once again operated at its rated speed.
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