The calculation of the normal and critical operating conditions of the driving piston can be calculated from the above conditions to calculate the nitrogen pressure F and the pressure required for the driving piston under normal operation and the following two critical conditions. The required nitrogen pressure is: F=N+G=-K(L1-L0)+G=6090.39N. The required nitrogen pressure is: P=F/S=0.5017MPa.
The calculation of the pusher frame press fork just in contact with the suction valve disc. Since the lift of the 1 compressor suction valve is 2 mm, the length of the drive piston spring L2=L3-0.002=0.065m when the pusher frame press fork just touches the suction valve plate and there is no thrust on the valve piece. The required nitrogen pressure in the state is: F=-K(L2-L0)+G=4222.70(N) The required nitrogen pressure is: P=F/S=0.3478MPa The compressor is just calculated when the compressor is completely unloaded. The nitrogen pressure required for complete unloading is: F=N+G=-K(L3-L0)+G=3755.77N The required nitrogen pressure is: P=F/S=0.3094MPa2.3 Intake valve plate frequently The reason for the damage and the low displacement of the compressor is analyzed. The compression amount of the driving piston spring is the abscissa in the three states calculated during the analysis of the driving force of the piston, and the pressure P of the required nitrogen is plotted on the ordinate. The relationship between the spring compression amount $L and the nitrogen pressure P is obtained.
The relationship between the nitrogen pressure and the spring compression of the suction valve top opening device can be clearly seen: (1) When the nitrogen pressure is higher than 0.3478 MPa, the nitrogen pressure can effectively overcome the elastic force of the driving piston spring, so that the propeller frame The fork is separated from the suction valve and the compressor works normally.
(2) When the nitrogen pressure is lower than 0.3094 MPa, the piston spring force is driven to overcome the nitrogen pressure, and the propeller frame is pushed to open the suction valve, and the compressor removes the load and stops the suction. (3) When the nitrogen pressure is between 0.30940.3478 MPa, the pusher frame press fork has pressed against the suction valve plate, but the suction valve cannot be completely opened, causing the suction valve plate to violently hit the pusher frame. . Since the contact area between the pusher frame and the valve plate is much smaller than the contact area between the valve seat and the valve plate, the impact strength of the pusher frame on the valve plate is far greater than the impact strength of the valve seat on the valve plate, and the valve plate is quickly damaged. At the same time, due to the compression of the compressor piston, the valve plate can not be in good contact with the valve seat, and the gas that has been sucked is partially returned to the compressor inlet, resulting in a decrease in the displacement of the compressor.
The solution to the problem can be seen from the above analysis. The fundamental reason for the frequent damage of the valve of the suction valve of the 1 compressor is that the nitrogen pressure acting on the piston of the suction valve top opening device cannot be stabilized above 0.3478 MPa. 1 The installation position of the compressor is far away from the main line of nitrogen, and there are more gas points along the way. When a large amount of gas is used, the nitrogen pressure of the compressor will be greatly fluctuated. Once the boundary is between 0.30940.3478MPa, the compressor will be caused. The valve of the suction valve is damaged and the displacement of the compressor is reduced; once it is lower than 0.3094 MPa, the compressor is operated at an empty load.
In view of the compressor unloading, the unloading can be completed in about 5 minutes, which is far lower than the normal running time of the compressor. As long as the stable spring force and the unstable nitrogen pressure are changed, the compressor load is not required to be operated. Depending on the nitrogen pressure, the disadvantages of the suction valve opening device can be solved. The suction valve opening device is modified as shown, the nitrogen pressure acts vertically on the driving piston 4, and the spring force of the spring 9 acts vertically on the driving piston 4, thereby greatly improving the reliability of the suction valve opening device.
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