High negative pressure large flow rotary air valve

Abstract

The high negative pressure large flow rotary air valve includes one sucking board with two sucking openings, one back board, and one turntable closely sandwiched between the sucking board and the back board and with central shaft connected to the servo motor fixed on the back board. The back board has two air holes coaxial with the sucking openings on the sucking board separately; and the turntable is provided with one or several through holes to communicate the first air hole with the first sucking opening or the second air hole with the second sucking opening alternately. The present invention controls the opening and closing of the two air channels with the rotating middle turntable, and the resistance on the rotating turntable is less dependent on the negative pressure, resulting in high negative pressure bearing capacity and excellent separating effect. The present invention has also the features of simple structure and less faults.

Description

technical field [0001] The invention relates to a negative pressure air valve, which can be used in postage machines and other devices to separate and absorb letters or other sheet articles. Background technique [0002] In the separation device of the postage meter, a negative pressure separation valve is generally used to absorb letters and separate them. There are two negative pressure suction ports on the front and back of the separation air valve. The alternate action of these two negative pressure suction ports can ensure that the letters can be separated reliably. The alternate action of the two negative pressure suction ports is also called "double-click". At present, the most advanced separation gas valve is the electromagnet-thin film separation gas valve, but the separation gas valve still has the following deficiencies: [0003] 1) The airtightness will affect the double-click on the letter, so the airtightness of the valve is very high, which increases the diff...

AI Technical Summary

Problems solved by technology

[0003] 1) The airtightness will affect the double-click on the letter, so the airtightness of the valve is very high, which increases the difficulty of processing and assembly

If the air tightness is not good, the gas leaks in the relatively closed space, and the two suction ports will affect each other. The suction that should not be sucked will also have suction, and the suction that should be sucked will not suck firmly.

[0004] 2) The level of negative pressure will affect the flexibility of the reciprocating motion of the film. The higher the negative pressure, the less flexible the movement of the diaphragm

[0005] When attaching a letter larger than 10mm, it is already quite difficult due to the high negative pressure required

[0006] 3) High requirements for the diaphragm

In actual use, the diaphragm often breaks

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