Compressor quality appraisal

compressor is a driven fluid machine that elevates low-pressure gas to high-pressure gas. It is the heart of the refrigeration system. It drives the piston or mechanical structure to compress the gas through the operation of the motor, thereby changing the low-temperature and low-pressure refrigerant gas into the high-temperature and high-pressure refrigerant gas to provide power for the refrigeration cycle.
compressor is widely used in air compression separation and filtration machinery, petroleum gas, natural gas, oil field gas compressors in the petrochemical industry, etc., demonstrating its important position in industrial and refrigeration systems.
In compressor quality appraisal cases, Zhongke Testing can provide compressor quality appraisal services.

1. Equipment performance:
Compression ratio: Evaluate the compression ratio of the compressor, that is, the ratio of the compressor outlet pressure to the inlet pressure. A higher compression ratio generally indicates higher vapor compression efficiency.
flow range: Check whether the flow range of the compressor meets the system requirements, including minimum flow and maximum flow.
Energy Efficiency: Evaluate the energy efficiency level of a compressor and compare its energy consumption with similar compressor equipment or industry standards.
maintenance requirements: Understand the maintenance requirements and maintenance intervals of the compressor to evaluate its maintenance cost and ease of operation.
2. Equipment reliability:
Life and durability: Evaluate the design life and service life of the compressor and whether it can operate reliably for a long time under normal operating conditions.
failure rate: Query the failure rate data of the compressor to understand its reliability and maintenance needs.
Availability: Evaluates compressor availability, i.e. whether the equipment is able to operate properly when needed.
3. Compressor material and corrosion resistance:
0 material selection: Understand whether the material used in the compressor is corrosion-resistant and can adapt to high-salt wastewater environments. Commonly used corrosion-resistant materials include stainless steel, acid- and alkali-resistant alloys, etc.
1 material testing: The material of the compressor can be tested and its corrosion resistance evaluated through chemical analysis, metallographic microscope and other testing methods.
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GB/T 12691-2021 Air compressor oil
GB/T 4975-2018 Positive displacement compressor terminology General principles
GB/T 3853-2017 Positive displacement compressor Acceptance test
GB/T 25630-2010 Turbine compressor Performance test procedures
GB/T 19410-2008 Screw refrigeration compressor
GB/T 4980-2003 Determination of noise of positive displacement compressor
GB/T 18429-2018 Fully enclosed scroll refrigerant compressor
GB/T 21360-2018 Refrigerant compressor for automobile air conditioning
GB/T 13928-2015 Miniature reciprocating piston air compressor
GB 22207-2008 Positive displacement air compressor Safety requirements
0GB/T 41099-2021 Reciprocating piston compressor monitoring system specification
1GB/T 10079-2018 Piston single-stage refrigerant compressor (group)
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An electrical appliance company purchased a batch of compressors for use in the production of refrigerators. After the batch of refrigerants was sold, customers successively asked to return the refrigerators due to compressor quality problems, resulting in huge economic losses for the electrical appliance company and resulting in disputes with the compressor manufacturers.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" in the compressor involved.
appraisal analysis results:
The appraisal analysis expert group discussed the relevant information and on-site investigation of the compressor involved and made a comprehensive quality and technical analysis, and made the following suggestions and conclusions:
According to the sampling inspection, the compressor provided by the defendant compressor manufacturer had problems such as high temperature and blackening after use, loosening of the motor tie and damage to the motor, wear and tear of the connecting rod and crankshaft running pair, damage to the connecting rod, and jamming (rotation).
The main reasons are: the refrigerant charge in the refrigeration system or the throttling device of the refrigeration system is unreasonable, the amount of lubricating oil returned to the compressor in the refrigeration system is insufficient, internal overheating caused by long-term operation: the material of some compressor moving parts does not meet the design requirements, and it is not ruled out that the processing accuracy of some compressors does not meet the design requirements, and the original lubricating oil charge is too small.