Carbamide injection valve

Abstract

The invention relates to a urea jet valve. A valve disk is arranged inside an ejector, a magnetic coil component, a spring upper seat, a spring, a spring upper seat, an armature iron, a bushing ring and a packing washer are sheathed on the valve disk in sequence; the urea jet valve is characterized in that a sealing ring is sheathed on the valve disk which is connected with the sealing ring by means of interference fit. The sealing ring is made from elastic fluorubber. The valve disk and the sealing ring are connected by cementing agent in interference fit. The lower end of the packing washer presses upon an outer ring of the upper surface of the sealing ring. The integrated structure of the urea jet valve of the invention is compact and reasonable; a sealing element and the valve disk are contacted to achieve reliable sealing, hydraulic pressure bearing strength and shock resistance by the holding force generated by the elastic deformation of the sealing element; the sealing element with elasticity can deform and resist corrosion, thus improving durability of the sealing element; in addition, the sealability is stable and the service life is long; moreover, the purpose of completely separating a magnetic valve from liquid is fully achieved and the sealability of a pressure leading-in chamber of the urea jet valve is improved.

Description

technical field [0001] The invention relates to a urea aqueous solution injection valve, especially used in a urea aqueous solution and air mixing metering pump system of an automobile exhaust aftertreatment system, and is used for spraying urea aqueous solution with a pressure of 0.3 MPa into a gas-liquid mixing chamber. Background technique [0002] In the existing devices, the reciprocating or rotating shaft passes through the seal to enter the environment such as oil, water, etc. However, due to the relative sliding between the shaft and the seal, it is easy to wear and cause the working medium to leak from the pressure chamber , thereby corroding the armature and electromagnetic coil made of pure electrical iron, reducing its performance, and even failing in severe cases. In order to prevent the coil from failing due to scrapped seals, a special structure can be used to cover the corrosive parts such as the electromagnetic coil to prevent corrosion, but this structure s...

AI Technical Summary

Problems solved by technology

[0002] In the existing devices, the reciprocating or rotating shaft passes through the seal to enter the environment such as oil, water, etc. However, due to the relative sliding between the shaft and the seal, it is easy to wear and cause the working medium to leak from the pressure chamber , thus corroding the armature and electromagnetic coil made of pure electrical iron, reducing its performance, and even failing

In order to prevent the coil from failing due to scrapped seals, a special structure can be used to cover the corrosive parts such as the electromagnetic coil to prevent corrosion, but this structure sacrifices part of the electromagnetic suction and reduces the corresponding speed of the valve core. At the same time, the structure and complex process

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