When the generator voltage rises to 14~18V with the speed, the relay RL1 is pulled in
When the rotational speed of the compressor is constant, if the air flow of the compressor decreases for some reason, the component of the absolute speed at the inlet of the working impeller in the direction of the engine axis decreases, so that the angle of attack increases.
In the case of large air flow, the air flow is separated at the back of the blade. This phenomenon occurs on the back of the blade. When the engine speed is constant, the component of the absolute speed at the inlet of the wheel in the direction of the engine axis increases due to a certain time. The angle of attack is increased. If the negative angle of attack is too large, the airflow will be separated at the blade basin, making the blade channel smaller, and even the throat will be blocked.
When the air flow of the compressor decreases and the angle of attack of the moving blades increases to the vicinity of the critical angle of attack, some of the blades in the moving blades may be separated first.
The principle of electromagnetic relay type reverse current protector circuit The inclined position of the polarized relay, due to the air gap a1 (a2, the magnetic flux i1>i2 in the air gap, therefore, the electromagnetic attraction force F1 of the left pole shoe to the armature is greater than the right pole The electromagnetic suction force F2 of the shoe causes the armature to be subjected to a clockwise moment and deflects in the forward direction, so that the contact K is disconnected.
It is assumed that there is a battery connected to the power grid, the generator has generated electricity and the polarity is correct, and the generator control switch GC.S is turned on.
When the generator voltage rises to 14~18V with the speed, the relay-relay RL1 is pulled in, and the two pairs of normally open contacts are closed, so that the differential pressure coil W1 and the coil of the relay RL2 are connected between the power grid and the positive pole of the generator. Detects the voltage difference between two power supplies.
Commonly used calcium-based grease ZG series, good water resistance, poor heat resistance, used for bearing lubrication of 55 ~ 60 ℃ closed motor; sodium-based grease zN series, good heat resistance, poor water resistance, used for high temperature , Open motor with a non-humid environment; calcium-sodium-based grease zGN series, used for 80~
Motors in a humid environment at 100°C; graphite calcium-based grease zG-S series, with good wear resistance, pressure resistance and water resistance, suitable for lubrication of rough and heavy-duty friction parts below 60°C.
Lithium-based grease ZL series is a general-purpose long-life grease with good water resistance, heat resistance, good mechanical and chemical stability, suitable for high temperature, high speed and water contact motor lubrication.