Unlike the principle type of reciprocating pump transmission medium, the reciprocating vacuum pump is also a kind of equipment that uses the cylinder and the piston to reciprocate to generate suction, the difference is that one conveys the medium and draws a vacuum. Because the working medium of the reciprocating vacuum pump is gas, when the piston runs to the outer dead point, the stress will expel the gas in the cylinder as much as possible, so as to avoid too much residual gas and cause the piston to move inwards.This part of the gas expands and reduces the suction the amount.
Of course, compared with the structure of the intake valve and the discharge valve of the reciprocating pump, the structure of the intake valve and the exhaust valve is also different. When the eccentric wheel 2 on the main shaft of the reciprocating vacuum pump with a plane slide valve gas distribution mechanism rotates, the joystick 3 is driven to reciprocate, thereby driving the plane slide valve in the slide valve gas distribution mechanism 1 to make it reciprocate. The eccentric angle of the eccentric shaft is 90oa.
The flat slide valve gas distribution mechanism is an important feature of the reciprocating vacuum pump that is different from other delivery pumps:
Reciprocating vacuum pump plane slide valve gas distribution mechanism. There is an inverted "II" shaped air passage on the spool valve. When Huozhai moves to the dead point, the flat spool valve is in the middle position, and no high-pressure gas discharged from the cylinder clearance passes through this "II" shaped gas. Flow into the working chamber on the other side of the piston, that is to say, through this "n" shaped air passage, the pressure on the exhaust side is reduced, so that a considerable part of the exhaust side has not been exhausted into another instance, which can be Discharge on one side. In this way, the working efficiency of the cylinder of the vacuum pump is improved, and the pressure on both sides of the piston dead point is balanced.
The plane slide valve gas distribution mechanism mainly plays the role of pressure balance. The ratio of exhaust pressure to intake pressure is called the pressure ratio. If you want to get a 95% vacuum, when the suction pressure is 38x33.32Pa and the discharge pressure is 760x133.2Pa, the pressure ratio is ￡ one chip and two 20. In the case of such a high pressure ratio, the volume coefficient is easy The drop is so low that the pumping rate drops to near zero. Therefore, measures to improve the volume coefficient must be taken in the structure. This measure is generally a method of pressure balance.
Due to the complexity of the structure of the reciprocating vacuum pump, it also determines the difficulty of its maintenance. However, it does not need to be lubricated by Youfu, and it is also widely used in many fields. In order to better utilize the performance of reciprocating vacuum pumps and improve the needs of industrial production, in recent years, continuous research has been carried out, and many manufacturers have carried out good pumps. The improvement, for example, the plane slide valve is changed to the automatic spring intake and exhaust valve in the compressor, which not only simplifies the pump structure, but also provides side speed, of course, the pump volume can also be reduced.
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