Auxiliary sealing structure for water injection wellhead device

The auxiliary sealing structure for the water injection wellhead device comprises a water injection pipe, a supporting sleeve is fixedly installed in the water injection pipe, a gathering sleeve is arranged in the water injection pipe and located below the supporting sleeve, and stop blocks are movably embedded in the positions, close to the two sides, of the lower surface of the water injection pipe. And a flow slowing piece is fixedly mounted in the supporting sleeve. According to the auxiliary sealing structure for the water injection well head device, when water flow penetrates through the gathering sleeve to uprush, the flowing water flow can drive the spiral piece of the flow slowing piece to rotate, the rotating spiral piece drives the shifting plate to rotate, the rotating shifting plate can stir the uprush water flow, and therefore the water flow can be evenly stirred. In this way, the upward gushing tendency of water flow can be effectively slowed down, the scouring force of the upward gushing water