What are the factors that affect the sealing effect of the slide valve vacuum pump

The slide valve vacuum pump is a kind of device or equipment which uses mechanical, physical, chemical or physical chemical methods to extract air from the container to obtain vacuum Generally speaking, the slide valve vacuum pump is a device which can improve, produce and maintain vacuum in a closed space by various methods 1 The greater the spring compression is, the better the sealing effect of the rotary vane vacuum pump is In fact, the greater the spring compression is, the sharp wear of the friction pair can be caused, and the instantaneous burning loss can be caused The excessive compression makes the spring lose the ability to adjust the end face of the moving ring, resulting in the seal failure 2 The tighter the moving ring seal is, the better In fact, it is harmful to the moving ring seal The first is to intensify the wear and leakage between the seal ring and the shaft sleeve; the second is to increase the resistance of the axial adjustment and movement of the moving ring, which cannot be adjusted in time when the working condition changes frequently; the third is that the spring is prone to damage due to excessive fatigue; the fourth is to make the moving ring seal ring deformed, which affects the sealing effect 3 The tighter the static ring seal ring is, the better The static ring seal ring is basically in a static state, and the relatively tight sealing effect will be better, but too tight is also harmful The first is to cause excessive deformation of the static ring seal, which affects the sealing effect of the slide valve vacuum pump; the second is that the static ring is mainly made of graphite, which is generally brittle and easy to crack due to excessive stress; the third is that it is difficult to install and disassemble, which is easy to damage the static ring 4 The tighter the impeller lock nut, the better In the mechanical seal leakage of the slide valve vacuum pump, the leakage between the shaft sleeve and the shaft is relatively common In my opinion, the inter shaft leakage is that the impeller lock nut is not locked tightly In fact, there are many factors that cause the inter shaft leakage, such as the failure and deviation of the inter shaft gasket, the impurities in the inter shaft, the large form and position error in the fitting between the shaft and the shaft sleeve, the damage of the contact surface, the gap between the components on the shaft, and the too long thread of the shaft head, etc., which will lead to the inter shaft leakage Excessive locking of the lock nut will only lead to premature failure of the inter shaft gasket On the contrary, moderately locking the lock nut will keep a certain compression elasticity of the inter shaft gasket During operation, the lock nut will lock automatically and timely, so that the inter shaft gasket will always be in a good sealing state 5 The new one is better than the old one Relatively speaking, the effect of using the new mechanical seal is better than the old one However, when the quality or material of the new mechanical seal is not properly selected, the matching size error will affect the sealing effect In the polymerization and permeability medium, if the static ring is not excessively worn, it is better not to replace it Because the static ring is in a static state for a long time in the static ring seat, the polymer and impurities are deposited as a whole, which plays a better sealing role 6 It is better to dismantle and repair than not to dismantle Once there is leakage of mechanical seal, it is urgent to dismantle and repair In fact, sometimes the seal is not damaged, and the leakage can be eliminated only by adjusting the working condition or properly adjusting the seal In this way, we can not only avoid waste but also verify our fault judgment ability, accumulate maintenance experience and improve maintenance quality.