Magnetic drive type vacuum drawing valve

Abstract

The invention belongs to the field of vacuum valves, and discloses a magnetic drive type vacuum drawing valve which comprises a barrel, a main magnetic wheel assembly, an auxiliary magnetic wheel assembly, a lead screw assembly, a quick connector, a tripping assembly, a drawing rod and a reset piece. In the initial state, the tripping sleeve is located above the limiting mechanism, the limiting part supports the reset piece, the reset piece upwards lifts the limiting mechanism to relieve the clamping connection with the inner wall of the barrel and relieve the pressure on the tripping piece, the tripping piece leaves the quick-plug connector, and the drawing rod stretches into the quick-plug connector and is locked with the quick-plug connector so that the vacuum plug can be opened. In a tripping state, the tripping sleeve drives the pull rod and the vacuum plug to move downwards until the vacuum plug is inserted into the vacuum opening of the equipment again, the main magnetic wheel assembly is continuously rotated, the pull rod is static, the lead screw nut drives the tripping sleeve to continuously press the limiting mechanism, the limiting mechanism is clamped with the inner wall of the cylinder, and the limiting mechanism presses the tripping piece to enable the tripping piece to tightly press the quick-plug connector; and the drawing rod can be separated from the quick-plug connector. Zero leakage is achieved in the process of opening and closing the vacuum plug.

Description

technical field [0001] The invention relates to the field of vacuum valves, in particular to a magnetically driven vacuum pull valve. Background technique [0002] When vacuuming the equipment, it is necessary to open the vacuum port of the equipment, and after the vacuuming is completed, it is necessary to close the vacuum port of the equipment for sealing. Now, a mechanical pull valve is commonly used to open and close the vacuum port of the equipment. [0003] At present, the common mechanical pull-out valve on the market adopts a radial sealing structure for the pull-out rod and the valve seat. The opening and closing of the evacuation port of the equipment and the tightening and loosening of the vacuum plug of the evacuation port are realized by pulling and rotating the pull rod. The pull-out valve with this structure will have the following adverse effects due to the limitation of the sealing structure: [0004] First, to open and close the vacuum port of the equipme...

AI Technical Summary

Problems solved by technology

The above operations will cause relative movement between the evacuation rod and the valve seat, resulting in a certain vacuum leakage, especially in the case of high vacuum, the adverse effects of leakage will be more significant

[0005] Second, the tightening and loosening of the vacuum plug requires the rotation of the evacuation rod, and the vacuum plug and the equipment evacuation port are radially sealed structures. If the friction between the device evacuation port and the vacuum plug is small, the vacuum plug will be "rotated" when the evacuation rod is rotated. In order to increase the friction, it is often necessary to open the pump connection port to increase the friction by relying on atmospheric pressure. However, if there is a "following" at this time, it will be more harmful

[0006] Third, due to structural constraints, it is generally difficult to loosen the vacuum plug in a vacuum state, and if the operation is performed in a non-vacuum state, once a mistake is made, it is easy to cause a leak, a poor vacuum degree or even "broken air".

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