Sliding valve vacuum pump works

The working principle of the slide valve vacuum pump is actually similar to the pump, when the pump structure is different from the time of the two. Sliding valve vacuum pump principle is the main use of slide valve body to change the volume of the West gas cavity, which is called Huafa pump. "Although the slide valve vacuum pump is an old pump, compared with rotary vane pumps, it has outstanding features such as high working pressure (10 4 pa), large pumping capacity, continuous operation in harsh environments and durability, So it is widely used in vacuum smelting, vacuum drying, vacuum impregnation, vacuum distillation etc. At present, oil-sealed vacuum pumps widely used in the vacuum industry are mostly medium and small selection pumps and medium and large-size slide valve type vacuum pumps. The working principle of the vane pump is that under the dirty working conditions, the vane pump is stuck in the rotor groove. Although the vane pump overcomes this shortcoming to some extent, due to the distance between the center of mass of the spool valve and the center of rotation Not a fixed value, although some structural balance measures have been taken, but the balance can not be reached yet so that the vibration can not be eliminated completely. In particular, the larger the capacity of the pump, the greater the vibration. Meanwhile, the above two pumps, Exhaust volume compared to the size appears larger.

Mini Steel Tape Measure

1. Features of tape measure

Gift rulers are used for advertising and promotion. They are divided into Steel tape (steel tape) and leather tape (PVC plastic fiber tape). They are usually cute and compact. Tape measures are also called measuring tools. Eighty-five percent of the world's tape measures are exported from China.

2, the characteristics of the tape measure

(1) The tape measure is too deformed and will not fail

Why didn't it fail? The spring in the tape measure is very long, and its range from completely relaxed to fully tightened is very large. The entire stroke of the tape measure includes it, and there is a margin at both ends, so the tape measure will not fail.

(2) Pull one meter long and pull two meters long, there is no difference in tension

The spring of the tape measure is very thin, and the amount of deformation when it is tightened is also small, so the reaction force is very small, and the force change is not felt when the rule is pulled.

Mini Steel Tape Measure,small metal tape measure,tape measure measurements

Yucheng tengxu Measuring Tool Co., Ltd , https://www.txhardwaretools.com