Plunger for high abrasion-proof displacement pump

A volumetric pump, high wear-resistant technology, applied in the direction of plunger, variable volume pump components, pistons, etc., can solve the problems of difficult volumetric pumps to be popularized, easy to break the connection end, high manufacturing cost and other problems, and achieve simple manufacturing process , The connection terminal is firm and the material is simple

Active Publication Date: 2009-04-08
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material price of the ceramic plunger is high, the process is complicated, the manufacturing cost is high, and the connection end is easy to break, so it is difficult to popularize and use it in positive displacement pumps.

Method used

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  • Plunger for high abrasion-proof displacement pump

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Embodiment Construction

[0011] refer to figure 1 , a plunger for a high-wear-resistant volumetric pump, including a plunger core 1 made of chromium-nickel stainless steel with a connecting end, and the SIC The material is inlaid on the outer surface of the plunger core 1, so that the plunger core 1 is covered with a shell 2 with high hardness (physical and mechanical properties: density 3.0-3.2g / cm 3 , bending strength 350~500mpa, strength 9.2Mohs, elastic modulus 300~420GPa, thermal conductivity 40~81W / (m k), thermal expansion coefficient 4~4.5*10 -6 / °C). In order to ensure the airtightness of the plunger, a sealant layer 3 made of nitrile rubber is provided between the contact surface of the plunger core body and the SIC shell 2; the end of the plunger core body 1 is provided with The plug 4 made of 316L material seals the connecting end, and a sealing ring 5 is arranged between the shell 2 and the plug 4 .

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Abstract

The invention provides a plunger used for a positive-displacement pump, which is formed by embedding metallic and non-metallic materials and has good wear-resisting property. The plunger comprises a plunger core body which is manufactured by Ni-Cr stainless steel and provided with a connecting end head; the plunger core body is coated with a shell prepared by a SIC material; a sealing adhesive layer is arranged between the connecting end head of the plunger core body and the contacting surface of the shell; the end head of the plunger core body is also provided with a plug to plug the end head. The surface of the plunger adopts a gas-phase permeation SIC shell with high hardness, and has very small friction coefficient and good wear-resisting property and good self-lubricity; after being used by the positive-displacement pump, the wear-resisting property of the plunger is higher than the metallic plunger by more than 5 times, thereby being applicable to be used by the positive-displacement pump with high reciprocating frequency and short stroke; simultaneously, the anti-corrosion property of gas-phase permeation SIC material also solves the anti-corrosion property of the plunger, thereby prolonging the service life of the plunger, guaranteeing that the plunger can operate normally in any serious environment and being applicable to be used in highly corrosive mediums.

Description

technical field [0001] The invention relates to a plunger for a displacement pump, in particular to a plunger for a displacement pump which is inlaid with metal and non-metal materials and has good wear resistance. Background technique [0002] Positive displacement pumps are commonly used equipment in petroleum, chemical, electric power, metallurgy and other industries. Generally, the plunger for positive displacement pump is made of metal material, and its surface is hardened in order to increase the service life of the plunger. However, metal plungers are not effective in volumetric pumps with fast reciprocating frequency and short strokes, high friction coefficient, poor self-lubrication, fast wear and short service life, especially in volumetric pumps with strong corrosive media. The use cycle is shorter. The launch of the ceramic plunger solves the problem of plunger wear and prolongs the service life of the plunger. However, the price of materials of ceramic plunge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/14F16J1/00
Inventor 付登堂卢世忠王永恒王星联王华李昕军张博彦
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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