Combined piston type pulse solenoid valve

Abstract

The invention discloses a combined piston type solenoid valve used for removing dust on a bag-type dust remover. The valve body is divided into an upper chamber and a lower chamber by a transverse interlayer, wherein the upper chamber and the lower chamber are communicated each other, the transverse interlayer is provided with a passageway connected with the upper chamber and air, a small piston and a large piston are respectively arranged in the upper chamber and the lower chamber, the upper end of the small piston is arranged in the inner chamber of a valve cap, the lower end of the small piston is arranged on the connector of the passage of the upper chamber and air by a small piston sealing element, a valve rod is arranged above the small piston to control the moving thereof, and the valve rod is connected with the moving core of the coil of solenoid valve by penetrating through the valve cap. A piston return spring is arranged between the large piston and the transverse interlayer, the bottom of the large piston can be connected or disconnected with a blowing pipe in a high pressure air pocket, thus controlling the blowing action thereof. The through hole controlled by the small piston is right the pilot hole of the large piston, thus a large pulse solenoid valve is controlled by a small pulse solenoid valve. The invention is simple in structure, rapid in open and close and good in pulse blowing effect; and meanwhile the valve comprises no membrane and working life is long.

Description

technical field [0001] The invention relates to a solenoid valve, in particular to a compound piston pulse solenoid valve used for removing dust from a bag filter. Background technique [0002] Most of the traditional solenoid valves used to remove dust from the bag filter are diaphragm pulse solenoid valves. The pilot hole path of this type of pulse solenoid valve is long and the hole diameter is small, which is easy to block and cause the control failure of the solenoid valve; in addition, the life of the diaphragm structure is limited, so that the working life of the solenoid valve is too short. Moreover, the opening time of the diaphragm pulse solenoid valve is generally ≥ 85ms, resulting in the pulse strength formed by the compressed gas not being fully utilized. Therefore, the dust cleaning area of ​​the bag controlled by a single valve is generally ≤ 40m 2 . [0003] In order to solve the above problems, researchers designed a piston pulse solenoid valve. At presen...

AI Technical Summary

Problems solved by technology

However, the first-stage pilot part of foreign pilot-operated piston pulse solenoid valves always has a diaphragm structure, which also has the defects of easy blockage and failure, and short service life of the diaphragm.

Moreover, since this pulse solenoid valve adopts a composite control structure of electromagnetic and pneumatic, the closing of the solenoid valve is realized by the pressure of compressed gas, so its structure is more complicated and its installation is more inconvenient.

At the same time, it has the defect of continuous leakage of compressed gas during its use, resulting in serious loss of compressed gas

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