Combined sealing device for plunger pump

Abstract

The invention belongs to the field of solid pumps, and particularly relates to a combined sealing device for a plunger pump for pumping high-viscosity media such as tar residue. The combined sealing device at least comprises a pump cylinder block with a plunger hole, and a plunger part matched with the plunger hole in a splicing manner, wherein the plunger part can reciprocate linearly along the plunger hole; a cavity defined by the front end of the plunger part and a hole wall of the plunger hole forms a pumping cavity for accommodating and squeezing materials; a sealing unit for filling a fit clearance between the plunger part and the plunger hole is sandwiched between a peripheral wall of the plunger part and the hole wall of the plunger hole; the combined sealing device for the plunger pump further comprises a scrape ring for scraping off the viscous materials from the peripheral wall of the plunger part and / or the hole wall of the plunger hole; the scrape ring is embedded into the hole wall of the plunger hole and / or the peripheral wall of the plunger part is sleeved with the scrape ring in a surrounding manner; the scrape ring isolates the sealing unit from the pumping cavity; and the combined sealing device can realize an effect of high-seal conveying of the solid materials in the combined sealing device, and effectively ensure long service lives of sealing parts in the plunger pump simultaneously.

Description

technical field [0001] The invention belongs to the field of solid conveying pumps, and in particular relates to a combined sealing device for a plunger pump used for pumping high-viscosity media such as tar residue. Background technique [0002] With the improvement of society's requirements for energy saving and environmental protection, people have paid more and more attention to the low-harm or even harmless treatment of the pollutants eliminated by steel mills. At present, the solid delivery pump used in steel mills can pump the solid tar slag in the tar slag tank to the remote combustion furnace for full combustion, so as to realize the fully automatic closed-type pump with its high-pressure long-distance tar slag solid delivery performance. The purpose of waste recycling is to avoid the pollution of production waste to the environment. The solid conveying pump often adopts a hydraulically driven reciprocating plunger pump that can convey "harsh" materials. The plunge...

AI Technical Summary

Problems solved by technology

[0003] As an ideal equipment for conveying and dosing high-viscosity fluids, the solid delivery pump is responsible for the delivery and addition of highly corrosive, toxic, high-viscosity and high-pressure media in the petrochemical process, so its work reliability, sealing performance and The flow stability becomes more important; the working performance and sealing performance of the current solid conveying pump are obviously difficult to meet its actual working needs, mainly in the following aspects: the plunger pump, which is the mainstream of the solid conveying pump, mainly depends on its reciprocating motion. The reciprocating action of the plunger in the pump cylinder is realized. If the purpose of effective pumping is to be achieved, the movable sealing operation between the aforementioned two is essential. The current sealing method between the outer peripheral wall of the plunger and the inner wall of the pump chamber is mostly It is realized by the packing seal structure; however, due to the high viscosity, small particles and certain hardening and viscous characteristics of the tar residue itself, the often appearing or high-viscosity tar residue moves along the plunger in the pump under the action of huge pumping pressure. The fitting gap of the cylinder presses inward and even erodes the relatively soft packing sealing structure that is directly exposed to the outside, or the high-viscosity tar residue that adheres to the outer peripheral wall of the plunger and cannot be peeled off directly with the plunger during the reciprocating action of the plunger. The return action of the plug scrapes the packing seal structure and causes serious wear, thereby reducing the actual sealing effect of the packing seal ring, which has a great impact on its actual service life

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