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Batch pretreatment method for diamond-coated mechanical seal rings

A diamond coating and mechanical sealing technology, applied in metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of low working surface efficiency, poor uniformity and process stability, etc., and achieve the degree of surface roughening The effect of high uniformity, improving efficiency and ensuring stability

Active Publication Date: 2018-06-22
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to develop a fast diamond-coated mechanical seal against the technical defects of low efficiency, poor uniformity and poor process stability of the manual grinding roughened seal ring working surface in the pretreatment process of cemented carbide or ceramic mechanical seal rings. ring batch preprocessing method

Method used

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  • Batch pretreatment method for diamond-coated mechanical seal rings
  • Batch pretreatment method for diamond-coated mechanical seal rings
  • Batch pretreatment method for diamond-coated mechanical seal rings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The diamond-coated mechanical seal ring of this embodiment is applied in the delivery pump of the purified terephthalic acid plant. The device contains a large amount of toxic, harmful, flammable, explosive and highly corrosive chemical raw materials, so the requirements for the airtightness of the device and the chemical corrosion resistance of the mechanical seal are very high.

[0052] The base body of the mechanical seal ring for this application is YG6 cemented carbide, and its dimensions are The working surface is ring-shaped, with an inner diameter of 34mm and an outer diameter of 40mm.

[0053] The specific steps for depositing a diamond film on the working surface of a traditional hard alloy mechanical seal ring are as follows: first, immerse the seal ring in Murakami solution for ultrasonic treatment for 30 minutes, then wash and dry the hard alloy substrate with Caro solution for 1 minute to remove the cobalt on the surface of the substrate elements, follow...

Embodiment 2

[0057] The mechanical seal ring in this embodiment is directly applied to the performance test of the standard 100-hour seal ring. The base material of the seal ring is silicon carbide, and the external dimensions are The working surface is ring-shaped, with an inner diameter of 40mm and an outer diameter of 45mm.

[0058] Four sealing rings were processed respectively by batch pretreatment method and manual grinding method. The batch pretreatment method takes 5 minutes, and the manual grinding method takes 30 minutes. The working efficiency of the batch pretreatment method is 6 times that of the manual grinding method. During batch pretreatment, the pressure of the high-pressure airflow is 0.1Mpa, the size of the quartz sand is 120 mesh, the diameter of the high-pressure nozzle is 1mm, and the distance between the nozzle and the eroded surface is 3cm.

[0059] Subsequently, the sealing rings were ultrasonically cleaned with pure water and acetone, and then a diamond film w...

Embodiment 3

[0062] The diamond-coated mechanical seal ring of this embodiment is applied to a high-pressure pump, the conveying medium is viscous cement slurry, the base material of the seal ring is silicon nitride, and the external dimensions are The working surface is ring-shaped, with an inner diameter of 30mm and an outer diameter of 35mm.

[0063] The specific preparation method of the sealing ring is as follows: firstly, a batch pretreatment method is used to grind and roughen the working surface of the sealing ring. During batch pretreatment, the pressure of the high-pressure airflow is 0.1Mpa, the size of the quartz sand is 120 mesh, the diameter of the high-pressure nozzle is 1mm, and the distance between the nozzle and the eroded surface is 3cm. The workpieces were then cleaned with purified water and acetone. The diamond film was deposited on the surface of 12 sealing rings simultaneously by means of parallel hot wire arrangement, and the distance between the hot wire and the...

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Abstract

The invention relates to a batch preprocessing method for mechanical seal rings with diamond coatings. Cemented carbide mechanical seal rings preprocessed through acid and base or unprocessed silicon carbide / silicon nitride ceramic mechanical seal rings are used as substrates, high-pressure airflow with quartz sand as a medium is adopted for conducting erosion coarsening on working surfaces of the seal rings, a seal ring batch preprocessing device is used for completing assembly line type preprocessing of the seal rings through automatic feeding of the eroded seal rings and automatic rotation of high-pressure spray nozzles, and uniformly coarsened surface appearances suitable for growth of diamond films are quickly prepared in batches. Compared with a manual grinding coarsening preprocessing method, the batch preprocessing method for the mechanical seal rings can remarkably improve processing efficiency, can guarantee uniform coarsening of different positions of the same sealing ring and the sealing rings in the same batch as well as long-term stability of the preprocessing process, and has important significance in stabilizing the preparation process of the mechanical seal rings with the diamond coatings and improving the quality of products.

Description

technical field [0001] The invention relates to a batch pretreatment method of a diamond-coated mechanical seal ring, in particular to a batch pretreatment method of a diamond-coated mechanical seal ring performed by a seal ring batch pretreatment device, and belongs to the field of thin film technology. Background technique [0002] With the continuous advancement of science and technology, mechanical seals have been widely used in various fluid machinery and equipment. According to the survey, more than 90% of the pumps in refining and chemical equipment use mechanical seals. It can be seen that the mechanical seal occupies a pivotal position in the pump shaft seal. [0003] In the mechanical seal device, the dynamic and static seal rings are tightly fitted by spring tension. The contact surface of the two seal rings is the key part of the seal device, which directly determines the performance of the entire pump. When the contact surfaces of the dynamic and static sealin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/02
CPCC23C16/0254
Inventor 雷学林孙方宏何云
Owner EAST CHINA UNIV OF SCI & TECH