Positioning structure on top of high-pressure liquid ammonia pump cylinder

Abstract

The invention discloses a positioning structure on top of a high-pressure liquid ammonia pump cylinder. The positioning structure consists of a cylinder body, an outlet valve sleeve and a top flange, wherein the outlet valve sleeve with an upper end face is positioned in the cylinder and a pin hole is formed on the upper end face; the top flange is fixed at an outlet of the top of the cylinder body; a positioning pin is arranged below the top flange; and the positioning pin above the top flange is inserted into the pin hole on the outlet valve sleeve. The positioning structure on the top of the high-pressure liquid ammonia pump cylinder has a simple and reliable structure, the positioning depth is improved, so that the outlet valve sleeve is always positioned at an accurate position and does not deflect in the cylinder body, and positioning ineffectiveness caused by a failed sealing gasket in the cylinder body is avoided.

Description

technical field [0001] The invention relates to a high-pressure liquid ammonia pump, in particular to a positioning structure for the top of a cylinder body of a high-pressure liquid ammonia pump. Background technique [0002] The high-pressure liquid ammonia pump is the key equipment of the urea plant. The 1.75MPa liquid ammonia from the synthetic ammonia system is compressed to 20MPa under the action of the high-pressure liquid ammonia pump, and sent to the ammonia processing system to produce urea. Under the reciprocating action of the plunger, the high-pressure liquid ammonia pump completes the rhythmic opening of the inlet check valve and outlet check valve in the cylinder, changing the pressure of liquid ammonia from 1.75MPa to 20MPa. Whether the liquid ammonia can be smoothly exported to the cylinder depends on the correct position of the outlet valve sleeve. The position of the outlet valve sleeve is controlled by the positioning structure on the top of the cylinder....

AI Technical Summary

Problems solved by technology

Its original positioning structure is that the small gland is positioned to the outlet valve sleeve, and the top flange is positioned to the small gland. The positioning process is divided into two steps, and the structure is complicated.

[0004] During the operation of the high-pressure liquid ammonia pump, the intermediate gasket is easily deformed, which leads to the failure of the top positioning function, the outlet valve sleeve is no longer fixed in the original position, and the steering occurs, the liquid ammonia channel is blocked, and the cylinder is seriously overpressured. Causing liquid ammonia explosion and leakage accident

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