CN-122013032-A - Production process of anti-leakage machine body of reciprocating piston type compressor unit

Abstract

The invention relates to the technical field of compressors, in particular to a production process of an anti-leakage machine body of a reciprocating piston type compressor unit. The production process comprises the steps of casting molten iron into a die pre-embedded with a main oil pipe to obtain an anti-leakage machine body of the reciprocating piston compressor unit, wherein the anti-leakage machine body of the reciprocating piston compressor unit comprises the following chemical elements of, by weight, 2.9-3.5% of C, 1.5-2.3% of Si, 1.4-2.2% of Mn, less than or equal to 0.06% of P, less than or equal to 0.3% of S, less than or equal to 0.03% of Sb and less than or equal to 0.1% of Sn. The invention maintains the advantages of the production process of the anti-seepage machine body casting and the pre-buried main oil pipe modeling, overcomes the defects of the anti-seepage machine body casting and the pre-buried main oil pipe modeling, has small shrinkage tendency of molten iron, improves the matching degree/fitting degree with the machine body casting process, can reduce casting defects, improves the product yield of the machine body casting, and reduces the production cycle of the reciprocating piston compressor unit.

Inventors

• HUANG CONG
• XU SHUJIE
• YANG PENG
• LI JIAN
• LI SHANGCHUN
• Ye Faxing
• WEN SHAN
• HOU LEI
• HU LINGLING
• XIE SIWEI
• CAI WEI
• ZHOU HUI
• Deng Ganyin
• YAN YONG
• QIN MING
• LIAO YULONG
• YANG RUIXIN
• HUANG HAO
• ZENG ZEPING
• HUANG MIN
• GAO YANG
• CHEN YU
• CHEN YONG
• LI SHENG
• JIANG YONG
• LI YAO
• DUAN YUEHONG
• ZOU QING
• WU SIJUN
• HUA XUN
• LONG YUN
• LONG JIE
• LIU XIAOLIN
• YAN YONGCHENG
• MENG RENJIE
• ZHANG MAOLIN
• DONG WEIWEI
• YANG JIE
• TAN XUEMU
• WANG XIN

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团济柴动力有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (10)

1. 1. The production process of the anti-leakage machine body of the reciprocating piston type compressor unit is characterized by comprising the steps of casting molten iron into a die pre-embedded with a main oil pipe to obtain the anti-leakage machine body of the reciprocating piston type compressor unit, wherein the anti-leakage machine body of the reciprocating piston type compressor unit comprises the following chemical elements in composition and content: C 2.9~3.5wt%; Si 1.5~2.3wt%; Mn 1.4~2.2wt%; P ≤0.06wt%; S ≤0.3wt%; Sb ≤0.03wt%; Sn ≤0.1wt%; The balance of iron and unavoidable impurity elements.
2. 2. The process for manufacturing an anti-leakage machine body of a reciprocating piston compressor set according to claim 1, wherein the temperature of molten iron is 1440-1480 ℃.
3. 3. The process for producing an anti-leakage machine body of a reciprocating piston compressor unit according to claim 1 or 2, wherein the smelting of the molten iron comprises the steps of rapidly melting pig iron, carburant, scrap steel and returned materials based on high current, melting and heating up to smelt, and discharging to obtain the molten iron.
4. 4. The production process of the anti-leakage machine body of the reciprocating piston compressor unit according to claim 3, wherein the mass ratio of pig iron to scrap steel to return material is 0-30:10-50:20-90.
5. 5. The manufacturing technique of the anti-leakage machine body of the reciprocating piston compressor unit of claim 3, wherein in the heating and smelting process, sampling is performed for stokehole carbon-silicon analysis and stokehole spectrum analysis, and chemical components and contents of molten iron are adjusted according to results of stokehole carbon-silicon analysis and stokehole spectrum analysis.
6. 6. The process for producing the anti-leakage machine body of the reciprocating piston compressor unit of claim 5, wherein the temperature for analyzing and sampling carbon and silicon in front of the furnace is 1400-1430 ℃.
7. 7. The process for producing an anti-leakage machine body of a reciprocating piston compressor unit according to claim 5, wherein the temperature for stokehole spectral analysis sampling is 1420-1450 ℃.
8. 8. The process for producing an anti-leakage machine body for a reciprocating piston compressor set according to claim 3, wherein scum on the surface of molten iron is scraped off before tapping, and inoculant is added into the molten iron.
9. 9. The process for producing an anti-leakage machine body of a reciprocating piston compressor unit according to claim 3, wherein the inoculant is added in an amount of 0.6wt% of molten iron.
10. 10. The process for producing the anti-leakage machine body of the reciprocating piston compressor unit according to claim 3, wherein the heating smelting is carried out by heating to 1480-1530 ℃ and preserving heat for 3-10 min.

Description

Production process of anti-leakage machine body of reciprocating piston type compressor unit Technical Field The invention relates to the technical field of compressors, in particular to a production process of an anti-leakage machine body of a reciprocating piston type compressor unit. Background The reciprocating piston compressor unit can realize gas compression and transportation, is widely applied to key projects such as gas storage and offshore drilling platforms, has the main functions of supporting the weight of parts of the reciprocating piston compressor unit and ensuring the correct relative positions among the parts, so that the design and manufacturing quality of the machine body directly influence the performance and service life of the reciprocating piston compressor unit, reduces the mechanical connection point of a main oil pipe, reduces the leakage risk of lubricating oil, enhances the structural stability of the machine body, improves the performance of the reciprocating piston compressor unit and prolongs the service life, and therefore, the manufacturing of the machine body has the technical advantages of combining an integral casting process with the modeling process of the embedded main oil pipe, and is accompanied by the problem of leakage prevention of the machine body. In the prior art, the airframe casting and the molding process combined with the embedded main oil pipe are known to manufacture the airframe of the reciprocating piston compressor unit, the airframe casting material mainly consists of a common gray cast iron (HT 250) component and a chromium (Cr) +copper (Cu) alloy component with reduced shrinkage tendency (hereinafter abbreviated as an old formula), however, in the actual production process, the airframe with the casting defects is always changed in visual detection and pressure test effect due to the casting defects of the airframe casting, the airframe with the casting defects can only be scrapped and the airframe with no casting defects is cast by remelting molten iron, the reason for the occurrence of the casting defects is further analyzed, the shrinkage tendency of the molten iron obtained by smelting according to the known smelting formula is considered to be still larger, the shrinkage cavity is easily formed after casting, and the casting defects are finally influenced, the shrinkage test leakage effect of the airframe casting is finally, in addition, the design of the reciprocating piston compressor unit is designed or the composition of moving parts is adjusted by preferentially considering the requirements of the actual application scenes, the airframe is required to meet the stress condition of the moving parts, the mechanical property is always regulated by adjusting the chemical composition of the airframe, the shrinkage of the molten iron used in the airframe is always changed due to the mechanical property, the casting of the airframe structure and the shrinkage of the molten iron and the cooling condition after the airframe structure and the molten iron is cast again, the airframe is easily influenced, the airframe casting defects are easily, the shrinkage defects are easily caused, and the airframe casting defects are not can only be easily produced, and the shrinkage defects are easily have the shrinkage defects after the shrinkage defects are easily caused after the airframe casting and the airframe casting defects are easily cooled after the shrinkage defects are not are easily cooled down, and the airframe shrinkage defects are not is easily can be influenced. I produced 138 airframes (including airframes that were recast due to airframes being scrapped) one year based on the previous old formulation, among which 14 airframes were scrapped due to casting defects, 5 were scrapped due to leak testing, and the total annual total rejection rate was 13.77% ((14+5)/138), and the airframe product yield was not high, which was still severe due to leakage scrapping and overall cycle extension of the reciprocating piston compressor unit due to reworking of airframes. Disclosure of Invention In order to retain the advantages of the anti-leakage machine body casting and the pre-buried main oil pipe modeling production process and overcome the defects of the anti-leakage machine body, the anti-leakage production process of the reciprocating piston compressor unit is provided, the chemical element composition and the content of molten iron improve the matching degree/the fitting degree with the machine body casting process, the casting defects can be reduced, the product yield of the machine body casting is improved, and the production period of the reciprocating piston compressor unit is reduced. The invention provides a production process of an anti-leakage machine body of a reciprocating piston type compressor unit, which comprises the steps of casting molten iron into a die pre-embedded with a main oil pipe to obtain the anti-leakage machine body of th